:root {
	--background: #f5f9fb;
	--background-accent: #e8f4fb;
	--surface: #ffffff;
	--surface-muted: #f0f8ff;
	--surface-elevated: rgba(255, 255, 255, 0.85);
	--border: rgba(10, 102, 194, 0.15);
	--border-strong: rgba(10, 102, 194, 0.3);
	--primary-50: #e8f4fb;
	--primary-100: #d1e9f7;
	--primary-400: #3b9bd9;
	--primary-500: #0A66C2;
	--primary-600: #095aa8;
	--primary-700: #084e8f;
	--text-900: #0f172a;
	--text-700: #334155;
	--text-500: #64748b;
	--text-300: #94a3b8;
	--success-500: #22c55e;
	--warning-500: #f59e0b;
	--danger-500: #ef4444;
	--radius-lg: 20px;
	--radius-md: 16px;
	--radius-sm: 12px;
	--shadow-sm: 0 10px 30px rgba(10, 102, 194, 0.08);
	--shadow-md: 0 18px 40px rgba(10, 102, 194, 0.12);
	--shadow-lg: 0 28px 60px rgba(10, 102, 194, 0.18);
	--blur-backdrop: saturate(180%) blur(18px);
	--font-sans: "Inter", "SF Pro Text", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
	--navbar-height: 72px;
	font-family: var(--font-sans);
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

html,
body {
	height: 100%;
}

body {
	font-family: var(--font-sans);
	background: radial-gradient(circle at 15% 20%, #e8f4fb 0%, transparent 40%),
		radial-gradient(circle at 85% 10%, rgba(10, 102, 194, 0.12) 0%, transparent 42%),
		radial-gradient(circle at 60% 75%, rgba(59, 155, 217, 0.12) 0%, transparent 40%),
		var(--background);
	color: var(--text-900);
	-webkit-font-smoothing: antialiased;
	line-height: 1.65;
}

/* Utility: disable page scroll when applied to body */
.no-scroll {
	overflow: hidden;
}

a {
	color: inherit;
	text-decoration: none;
}

a:hover {
	color: var(--primary-600);
}

img {
	display: block;
	max-width: 100%;
}

button {
	font: inherit;
}

main {
	position: relative;
	z-index: 1;
}

.app-shell {
	display: flex;
	flex-direction: column;
	min-height: 100vh;
}

.app-shell__main {
	flex: 1;
}

.shimmer {
	position: relative;
	overflow: hidden;
}

.shimmer::after {
	content: "";
	position: absolute;
	inset: 0;
	transform: translateX(-100%);
	background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.5), transparent);
	animation: shimmer 2.8s infinite;
}

@keyframes shimmer {
	100% {
		transform: translateX(100%);
	}
}

/* Layout */
.container {
	width: min(1480px, 98vw);
	margin: 0 auto;
}

.section {
	padding: clamp(3rem, 6vw, 5rem) 0;
}

/* Reduce top padding on course detail page */
.course-detail__layout {
	margin-top: -4.5rem; /* Pull content very close to navbar (90% reduction) */
}

/* Reduce top padding on course catalog page (90% reduction) */
.page-header:has(.filter-group) {
	margin-top: -4.5rem;
}

/* Reduce top padding on quizzes page - target page-header before quiz-layout */
.page-header:has(+ .quiz-layout) {
	margin-top: -4.5rem;
	margin-bottom: clamp(1rem, 2vw, 1.5rem); /* 50% reduction from default */
}

/* Reduce top padding on dashboard page (90% reduction) */
.dashboard-grid .page-header {
	margin-top: -4.5rem;
	margin-bottom: clamp(1rem, 2vw, 1.5rem); /* 50% reduction from default */
}

.page-header {
	margin-bottom: clamp(2rem, 4vw, 3rem);
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.page-header__eyebrow {
	display: inline-flex;
	align-items: center;
	padding: 0.35rem 0.75rem;
	border-radius: 999px;
	background: rgba(10, 102, 194, 0.12);
	color: var(--primary-600);
	font-weight: 600;
	font-size: 0.85rem;
	width: -webkit-max-content;
	width: max-content;
}

.page-header__actions {
	display: flex;
	flex-wrap: wrap;
	gap: 0.75rem;
}

.grid {
	display: grid;
	grid-gap: clamp(1.25rem, 3.2vw, 2rem);
	gap: clamp(1.25rem, 3.2vw, 2rem);
}

.grid--courses {
	grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid--metrics {
	grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

@media (min-width: 960px) {
	.grid--hero {
		grid-template-columns: repeat(2, minmax(0, 1fr));
		align-items: center;
	}
}

/* Navbar */
.navbar {
	position: -webkit-sticky;
	position: sticky;
	top: 0;
	z-index: 100;
	-webkit-backdrop-filter: var(--blur-backdrop);
	        backdrop-filter: var(--blur-backdrop);
	background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.95) 100%);
	border-bottom: 1.5px solid rgba(10, 102, 194, 0.15);
	box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.navbar__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 1rem 0;
	gap: 2rem;
}

.logo {
	display: inline-flex;
	align-items: center;
	gap: 0.75rem;
	font-weight: 800;
	color: var(--text-900);
	letter-spacing: -0.02em;
	font-size: 1.125rem;
	transition: opacity 0.2s ease;
}

.logo:hover {
	opacity: 0.8;
}

.logo__image {
	height: 44px;
	width: auto;
	display: block;
	object-fit: contain;
}

.logo__text {
	color: var(--primary-600);
	font-weight: 800;
}

.logo__mark {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 40px;
	height: 40px;
	border-radius: 12px;
	background: linear-gradient(140deg, var(--primary-600), #22d3ee);
	color: #fff;
	font-weight: 700;
	font-size: 1.1rem;
}

.mobile-menu-toggle {
	display: none;
	align-items: center;
	justify-content: center;
	width: 40px;
	height: 40px;
	border: none;
	background: transparent;
	color: var(--text-700);
	cursor: pointer;
	border-radius: 8px;
	transition: all 0.2s ease;
}

.mobile-menu-toggle:hover {
	background: rgba(10, 102, 194, 0.08);
	color: var(--primary-600);
}

.mobile-menu-toggle:active {
	transform: scale(0.95);
}

.mobile-menu-backdrop {
	display: none;
}

.nav-links {
	display: none;
	align-items: center;
	gap: 2rem;
}

@media (min-width: 900px) {
	.nav-links {
		display: flex;
	}
}

.nav-link {
	color: var(--text-600);
	font-weight: 600;
	font-size: 0.9375rem;
	transition: all 0.2s ease;
	display: flex;
	align-items: center;
	gap: 0.375rem;
	padding: 0.5rem 0.75rem;
	border-radius: 8px;
}

.nav-link:hover {
	color: var(--primary-600);
	background: rgba(10, 102, 194, 0.06);
}

.nav-link.active {
	color: var(--primary-600);
	background: rgba(10, 102, 194, 0.1);
	font-weight: 700;
}

.nav-link--mobile-only {
	display: none;
}

.nav-actions {
	display: flex;
	align-items: center;
	gap: 0.75rem;
}

/* Hero */
.hero {
	/* Reduce top gap by ~50% */
	padding: clamp(2rem, 4vw, 3rem) 0 clamp(3rem, 6vw, 4.5rem);
}

/* Make the home hero fill the viewport below the navbar and reduce inner spacing to avoid scroll */
.hero--full {
	height: calc(100vh - var(--navbar-height));
	display: flex;
	align-items: center;
	padding: clamp(1rem, 3vw, 1.5rem) 0; /* tighter to avoid overflow */
}

.hero--full .container {
	min-height: 100%;
}

.hero--full .hero__actions {
	margin-bottom: clamp(0.75rem, 2vw, 1rem);
}

.hero--full .hero__content {
	gap: 1rem;
}

.hero--full .hero__description {
	margin-bottom: clamp(0.9rem, 2.5vw, 1.2rem);
}

.hero__badge {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.35rem 0.8rem;
	border-radius: 999px;
	background: rgba(79, 70, 229, 0.14);
	color: var(--primary-600);
	font-weight: 600;
	font-size: 0.85rem;
	margin-bottom: 1.25rem;
}

.hero__title {
	font-size: clamp(2.25rem, 5vw, 3.5rem);
	line-height: 1.08;
	letter-spacing: -0.04em;
	margin-bottom: clamp(1.2rem, 3vw, 1.8rem);
}

.hero__title span {
	color: var(--primary-600);
}

.hero__description {
	color: var(--text-500);
	font-size: clamp(1rem, 2vw, 1.1rem);
	max-width: 32rem;
	margin-bottom: clamp(1.8rem, 4vw, 2.2rem);
}

.hero__actions {
	display: flex;
	flex-wrap: wrap;
	gap: 0.85rem;
	margin-bottom: clamp(2.5rem, 5vw, 3rem);
}

.hero-card {
	position: relative;
	background: linear-gradient(160deg, rgba(10, 102, 194, 0.5), rgba(14, 165, 233, 0.28));
	border-radius: var(--radius-lg);
	padding: clamp(1.6rem, 4vw, 2.2rem);
	color: #ffffff;
	overflow: hidden;
	box-shadow: var(--shadow-md);
}

/* Subtle dark overlay to boost text contrast */
.hero-card::before {
	content: "";
	position: absolute;
	inset: 0;
	background: linear-gradient(180deg, rgba(0, 0, 0, 0.28), rgba(0, 0, 0, 0.18));
	z-index: 0;
	pointer-events: none;
}

.hero-card::after {
	content: "";
	position: absolute;
	inset: -30% 30% 10% -20%;
	background: radial-gradient(circle, rgba(255, 255, 255, 0.55) 0%, transparent 58%);
	opacity: 0.4;
	transform: rotate(12deg);
}

.hero-card__header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	margin-bottom: 1.8rem;
	position: relative;
	z-index: 1;
}

.hero-card__badge {
	position: relative;
	z-index: 1;
	display: inline-flex;
	padding: 0.35rem 0.85rem;
	border-radius: 999px;
	background: rgba(15, 23, 42, 0.5);
	box-shadow: 0 1px 2px rgba(0,0,0,0.35);
	font-size: 0.9rem;
	font-weight: 700;
}

.hero-card__metric {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	grid-gap: 1.2rem;
	gap: 1.2rem;
	position: relative;
	z-index: 1;
}

.hero-card__metric-item h4 {
	font-size: 2rem;
	font-weight: 800;
	margin-bottom: 0.15rem;
	text-shadow: 0 1px 2px rgba(0,0,0,0.6);
}

.hero-card__metric-item p {
	color: rgba(255, 255, 255, 0.92);
	font-size: 1rem;
	text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.hero__content {
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
}

.hero-visual {
	position: relative;
	border-radius: var(--radius-lg);
	padding: clamp(1.4rem, 3vw, 1.9rem);
	background: linear-gradient(160deg, rgba(255, 255, 255, 0.9), rgba(232, 244, 251, 0.85));
	box-shadow: var(--shadow-md);
	overflow: hidden;
}

.hero-visual::after {
	content: "";
	position: absolute;
	inset: auto -30% -40% -10%;
	height: 260px;
	background: radial-gradient(circle, rgba(10, 102, 194, 0.28) 0%, transparent 60%);
}

.hero-visual__grid {
	display: grid;
	grid-gap: 1.25rem;
	gap: 1.25rem;
}

.hero-visual__image {
	display: block;
	width: 100%;
	height: auto;
	border-radius: var(--radius-md);
	box-shadow: var(--shadow-sm);
}

.hero-visual__row {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 1rem;
	border-radius: var(--radius-md);
	background: rgba(255, 255, 255, 0.6);
	-webkit-backdrop-filter: var(--blur-backdrop);
	        backdrop-filter: var(--blur-backdrop);
	box-shadow: var(--shadow-sm);
}

.hero-visual__row span {
	font-weight: 600;
	color: var(--text-700);
}

.hero-visual__row small {
	color: var(--text-300);
}

/* Buttons */
.button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.6rem;
	padding: 0.65rem 1.2rem;
	border-radius: 999px;
	font-weight: 600;
	font-size: 0.95rem;
	border: none;
	cursor: pointer;
	transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button--primary {
	background: linear-gradient(135deg, var(--primary-600), #1e88e5);
	color: #ffffff;
	box-shadow: var(--shadow-sm);
}

.button--primary:hover {
	transform: translateY(-1px);
	box-shadow: var(--shadow-md);
}

.button--ghost {
	background: rgba(10, 102, 194, 0.12);
	color: var(--primary-600);
}

.button--ghost:hover {
	background: rgba(10, 102, 194, 0.18);
}

.button--light {
	background: rgba(255, 255, 255, 0.85);
	color: var(--text-900);
	box-shadow: var(--shadow-sm);
}

.button--pill {
	border-radius: 999px;
}

.button--sm {
	padding: 0.45rem 0.85rem;
	font-size: 0.85rem;
}

/* Chips */
.chip {
	display: inline-flex;
	align-items: center;
	gap: 0.35rem;
	padding: 0.3rem 0.65rem;
	border-radius: 999px;
	font-size: 0.8rem;
	font-weight: 600;
	background: rgba(10, 102, 194, 0.12);
	color: var(--primary-600);
}

.chip--success {
	background: rgba(34, 197, 94, 0.12);
	color: var(--success-500);
}

.chip--ghost {
	background: rgba(148, 163, 184, 0.14);
	color: var(--text-500);
}

.chip--danger {
	background: rgba(239, 68, 68, 0.16);
	color: var(--danger-500);
}

/* Cards */
.card {
	background: var(--surface);
	border-radius: var(--radius-lg);
	padding: clamp(1.4rem, 3vw, 1.8rem);
	border: 1px solid rgba(10, 102, 194, 0.08);
	box-shadow: var(--shadow-sm);
	transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
	transform: translateY(-4px);
	box-shadow: var(--shadow-md);
}

.card--centered {
	display: flex;
	align-items: center;
	justify-content: center;
}

.card--message {
	display: grid;
	grid-gap: 1rem;
	gap: 1rem;
	text-align: center;
}

.card--loading {
	min-height: 320px;
}

.card--compact {
	padding: 1rem;
}

.card__title {
	margin: 0 0 0.5rem;
}

.list--bulleted {
	margin: 0;
	padding-left: 1.2rem;
}

/* Modern form fields */
.field {
	display: grid;
	grid-gap: 0.35rem;
	gap: 0.35rem;
}

.label {
	font-weight: 600;
	font-size: 0.9rem;
	color: var(--text-700);
}

.input-field {
	-webkit-appearance: none;
	        appearance: none;
	width: 100%;
	padding: 0.65rem 0.85rem;
	border-radius: var(--radius-md);
	border: 1px solid var(--border);
	background: rgba(255, 255, 255, 0.9);
	color: var(--text-900);
	outline: none;
	transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.input-field::placeholder {
	color: var(--text-300);
}

.input-field:hover {
	border-color: var(--border-strong);
}

.input-field:focus {
	border-color: var(--primary-500);
	box-shadow: 0 0 0 4px rgba(10, 102, 194, 0.12);
	background: #fff;
}

textarea.input-field {
	resize: vertical;
	min-height: 140px;
	line-height: 1.5;
}

.input-field:invalid {
	border-color: rgba(239, 68, 68, 0.6);
	box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.12);
}

.field__hint {
	font-size: 0.85rem;
	color: var(--text-500);
}

.metric-card {
	background: linear-gradient(160deg, rgba(255, 255, 255, 0.9), rgba(209, 213, 255, 0.65));
	border-radius: var(--radius-lg);
	padding: clamp(1.4rem, 3vw, 1.9rem);
	border: 1px solid rgba(10, 102, 194, 0.18);
	box-shadow: var(--shadow-sm);
}
.metric-card {
	background: linear-gradient(160deg, rgba(255, 255, 255, 0.9), rgba(219, 239, 255, 0.68));
}
.metric-card__icon {
	font-size: 1.25rem;
	color: var(--primary-600);
	margin-bottom: 0.35rem;
}

/* Ensure metric pieces stack (avoid inline run-on) */
.metric-card__eyebrow,
.metric-card__value,
.metric-card__caption {
	display: block;
}

.metric-card__eyebrow {
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--primary-600);
	margin-bottom: 0.6rem;
}

.metric-card__value {
	font-size: clamp(1.8rem, 4vw, 2.4rem);
	font-weight: 700;
	letter-spacing: -0.03em;
	margin-bottom: 0.3rem;
}

.metric-card__caption {
	color: rgba(15, 23, 42, 0.65);
	font-size: 0.9rem;
	margin-top: 0.1rem;
}

.text-xs { font-size: 0.8rem; }

.activity-item__question {
	font-weight: 600;
	color: var(--text-700);
}

.activity-item__date {
	font-size: 0.85rem;
	color: var(--text-300);
}

/* Course Card */
.course-card {
	position: relative;
	display: flex;
	flex-direction: column;
	gap: 1.4rem;
	padding: clamp(1.6rem, 3vw, 1.9rem);
	border-radius: var(--radius-lg);
	background: linear-gradient(150deg, rgba(255, 255, 255, 0.9), rgba(232, 244, 251, 0.65));
	border: 1px solid rgba(10, 102, 194, 0.1);
	box-shadow: var(--shadow-sm);
	overflow: hidden;
}

.course-card::before {
	content: "";
	position: absolute;
	inset: -60% auto auto -40%;
	width: 220px;
	height: 220px;
	background: radial-gradient(circle, rgba(10, 102, 194, 0.18) 0%, transparent 63%);
	opacity: 0;
	transition: opacity 0.3s ease;
}

.course-card:hover::before {
	opacity: 1;
}

.course-card__head {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 0.8rem;
	position: relative;
}

.course-card__badge {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.35rem 0.75rem;
	border-radius: 999px;
	font-size: 0.8rem;
	font-weight: 600;
	color: var(--primary-600);
	background: rgba(10, 102, 194, 0.12);
}

.course-card__title {
	font-size: 1.2rem;
	font-weight: 700;
	line-height: 1.35;
	letter-spacing: -0.02em;
	color: var(--text-900);
}

.course-card__description {
	color: var(--text-500);
	font-size: 0.95rem;
	line-height: 1.6;
	max-width: 34ch;
}

.course-card__meta {
	display: flex;
	flex-wrap: wrap;
	gap: 0.85rem;
}

.course-meta__item {
	display: inline-flex;
	align-items: center;
	gap: 0.4rem;
	padding: 0.35rem 0.65rem;
	border-radius: 10px;
	background: rgba(15, 23, 42, 0.04);
	color: var(--text-500);
	font-size: 0.85rem;
	font-weight: 500;
}

.course-meta__item strong {
	color: var(--text-700);
}

.course-card__footer {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 1rem;
}

.course-card__actions {
	display: flex;
	align-items: stretch; /* Make buttons same width */
	flex-direction: column; /* stack Start above Details */
	gap: 0.5rem;
	flex: 0 0 auto;
}

.course-card__actions .button,
.course-card__actions .course-card__cta {
	width: 100%; /* Ensure both buttons take full width */
}

.course-progress {
	display: grid;
	grid-gap: 0.3rem;
	gap: 0.3rem;
	font-size: 0.8rem;
	color: var(--text-500);
}

.progress-bar {
	width: 100%;
	height: 6px;
	border-radius: 999px;
	background: rgba(10, 102, 194, 0.14);
	overflow: hidden;
}

.progress-bar__fill {
	display: block;
	height: 100%;
	border-radius: inherit;
	background: linear-gradient(135deg, var(--primary-500), #1e88e5);
}

.course-card__cta {
	display: inline-flex;
	align-items: center;
	gap: 0.4rem;
	padding: 0.65rem 1.2rem; /* Match button size */
	border-radius: 999px;
	background: rgba(10, 102, 194, 0.14);
	color: var(--primary-600);
	font-weight: 600;
	font-size: 0.95rem; /* Match button font size */
	transition: transform 0.2s ease, background 0.2s ease;
}

.course-card__cta:hover {
	transform: translateX(2px);
	background: rgba(10, 102, 194, 0.22);
}

/* Course Modal */
.modal-overlay {
	position: fixed;
	inset: 0;
	background: rgba(15, 23, 42, 0.32);
	-webkit-backdrop-filter: blur(12px);
	        backdrop-filter: blur(12px);
	display: grid;
	place-items: center;
	padding: 1.5rem;
	z-index: 30;
}

.course-modal {
	width: min(640px, 96vw);
	border-radius: 24px;
	background: linear-gradient(160deg, rgba(255, 255, 255, 0.98), rgba(238, 241, 255, 0.95));
	border: 1px solid rgba(10, 102, 194, 0.2);
	box-shadow: var(--shadow-xl);
	position: relative;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.course-modal__header {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	gap: 1.5rem;
	padding: clamp(1.5rem, 4vw, 2rem);
	border-bottom: 1px solid rgba(10, 102, 194, 0.12);
	flex-shrink: 0;
}

.course-modal__header-content {
	flex: 1;
	min-width: 0;
}

.course-modal__badges {
	display: flex;
	gap: 0.5rem;
	margin-bottom: 0.75rem;
	flex-wrap: wrap;
}

.course-modal__title {
	font-size: clamp(1.375rem, 3vw, 1.75rem);
	font-weight: 700;
	line-height: 1.3;
	letter-spacing: -0.02em;
	margin: 0;
	color: var(--text-900);
}

.course-modal__instructor {
	margin: 0.5rem 0 0 0;
	font-size: 0.9375rem;
	color: var(--text-600);
}

.course-modal__close {
	flex-shrink: 0;
	background: rgba(10, 102, 194, 0.1);
	color: var(--primary-600);
	border: none;
	width: 40px;
	height: 40px;
	border-radius: 50%;
	display: grid;
	place-items: center;
	cursor: pointer;
	transition: all 0.2s ease;
	font-size: 1.5rem;
	font-weight: 300;
	line-height: 1;
}

.course-modal__close:hover {
	background: rgba(10, 102, 194, 0.18);
	transform: scale(1.05);
}

.course-modal__body {
	flex: 1;
	overflow-y: auto;
	padding: clamp(1.5rem, 4vw, 2rem);
	display: flex;
	flex-direction: column;
	gap: 2rem;
}

.course-modal__meta {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
	grid-gap: 1rem;
	gap: 1rem;
}

.course-modal__meta-item {
	padding: 1rem;
	border-radius: 12px;
	background: rgba(10, 102, 194, 0.08);
	border: 1px solid rgba(10, 102, 194, 0.12);
	display: flex;
	align-items: center;
	gap: 0.75rem;
	transition: all 0.2s ease;
}

.course-modal__meta-item:hover {
	background: rgba(10, 102, 194, 0.12);
	transform: translateY(-2px);
}

.course-modal__meta-icon {
	color: var(--primary-600);
	flex-shrink: 0;
}

.course-modal__meta-label {
	display: block;
	font-size: 0.8125rem;
	font-weight: 600;
	color: var(--primary-600);
	margin-bottom: 0.25rem;
	text-transform: uppercase;
	letter-spacing: 0.03em;
}

.course-modal__meta-value {
	display: block;
	font-size: 1.125rem;
	font-weight: 700;
	color: var(--text-800);
}

.course-modal__section-title {
	font-size: 1.125rem;
	font-weight: 700;
	color: var(--text-900);
	margin: 0 0 1rem 0;
	letter-spacing: -0.01em;
}

.course-modal__description {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
}

.course-modal__descriptor {
	color: var(--text-600);
	font-size: 0.9375rem;
	line-height: 1.6;
	margin: 0;
}

.course-modal__syllabus-wrapper {
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.course-modal__syllabus {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
	max-height: 400px;
	overflow-y: auto;
	padding-right: 0.5rem;
}

.syllabus-item {
	padding: 1rem 1.25rem;
	border-radius: 12px;
	border: 1px solid rgba(10, 102, 194, 0.15);
	background: rgba(255, 255, 255, 0.8);
	display: flex;
	justify-content: space-between;
	align-items: center;
	color: var(--text-700);
	transition: all 0.2s ease;
}

.syllabus-item:hover {
	background: rgba(255, 255, 255, 1);
	border-color: rgba(10, 102, 194, 0.25);
	transform: translateX(4px);
}

.syllabus-item__left {
	display: flex;
	align-items: center;
	gap: 1rem;
	min-width: 0;
	flex: 1;
}

.syllabus-item__index {
	width: 40px;
	height: 40px;
	border-radius: 10px;
	display: grid;
	place-items: center;
	background: rgba(10, 102, 194, 0.12);
	color: var(--primary-600);
	font-weight: 700;
	font-size: 0.9375rem;
	flex: 0 0 auto;
}

.syllabus-item__meta {
	display: flex;
	flex-direction: column;
	gap: 0.25rem;
	min-width: 0;
}

.syllabus-item__title {
	font-weight: 600;
	font-size: 0.9375rem;
	color: var(--text-800);
	line-height: 1.4;
}

.syllabus-item__subtitle {
	color: var(--text-500);
	font-size: 0.8125rem;
}

.syllabus-item__right {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	flex-shrink: 0;
}

.syllabus-item__note {
	font-size: 0.8125rem;
}

.syllabus-item__chevron {
	color: var(--text-400);
	font-size: 1.5rem;
	font-weight: 300;
	line-height: 1;
}

.course-modal__footer {
	padding: clamp(1.5rem, 4vw, 2rem);
	border-top: 1px solid rgba(10, 102, 194, 0.12);
	display: flex;
	flex-wrap: wrap;
	gap: 1rem;
	justify-content: flex-end;
	background: rgba(255, 255, 255, 0.5);
	flex-shrink: 0;
}

/* Course Detail */
.course-detail__layout {
	display: grid;
	grid-gap: clamp(0.9rem, 2.5vw, 1.6rem);
	gap: clamp(0.9rem, 2.5vw, 1.6rem);
	/* Single column layout since sidebar is now fixed */
	grid-template-columns: 1fr;
}

.course-detail__column {
	display: grid;
	grid-gap: 1.5rem;
	gap: 1.5rem;
	/* Prevent overlap with fixed sidebar - sidebar width + gap + right margin */
	max-width: calc(100% - min(320px, 25vw) - 2rem);
}

.lesson-card {
	background: rgba(255, 255, 255, 0.85);
	border-radius: var(--radius-lg);
	border: 1px solid rgba(10, 102, 194, 0.12);
	box-shadow: var(--shadow-sm);
	padding: clamp(1.2rem, 2.5vw, 1.6rem);
	display: grid;
	grid-gap: 1rem;
	gap: 1rem;
}

.lesson-card__media {
	border-radius: var(--radius-md);
	overflow: hidden;
	background: rgba(15, 23, 42, 0.05);
	aspect-ratio: 16 / 9;
	width: 100%;
}

.lesson-card__media iframe,
.lesson-card__media video {
	width: 100%;
	height: 100%;
	border: none;
	display: block;
}

/* Ensure the video doesn't get excessively tall on large screens */
@media (min-width: 1200px) {
	.lesson-card__media {
		max-height: 480px;
	}
}

/* When showing Unit Quiz inline, allow natural height and scrolling */
.lesson-card__media--quiz {
	aspect-ratio: auto;
	max-height: none;
	overflow: visible;
	background: transparent;
}

.lesson-card__quizwrap {
	display: grid;
	grid-gap: 0.75rem;
	gap: 0.75rem;
}

.lesson-card__quizbar {
	display: flex;
	justify-content: flex-start;
	align-items: center;
}

.lesson-card__placeholder {
	display: grid;
	place-items: center;
	height: 100%;
	padding: 2rem;
	color: var(--text-500);
	font-size: 0.95rem;
}

.lesson-card__header {
	display: grid;
	grid-gap: 0.6rem;
	gap: 0.6rem;
}

.lesson-card__header-content {
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.lesson-card__progress-badges {
	display: flex;
	gap: 0.5rem;
	flex-wrap: wrap;
}

.lesson-card__title {
	font-size: clamp(1.3rem, 2.6vw, 1.6rem);
	font-weight: 700;
	line-height: 1.3;
	word-wrap: break-word;
	overflow-wrap: break-word;
}

.lesson-card__description {
	margin-top: 0.25rem;
	line-height: 1.6;
	white-space: normal; /* allow wrapping to multiple lines */
}

.lesson-card__nav {
	display: flex;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 1rem;
	align-items: stretch;
	margin-top: 1.5rem;
	padding: 1.25rem;
	background: linear-gradient(135deg, rgba(10, 102, 194, 0.03) 0%, rgba(10, 102, 194, 0.01) 100%);
	border-radius: 16px;
	border: 1.5px solid rgba(10, 102, 194, 0.08);
}

.lesson-card__nav-group {
	display: flex;
	gap: 0.75rem;
	flex-wrap: wrap;
	align-items: center;
}

.lesson-card__nav-group--navigation {
	flex: 0 0 auto;
}

.lesson-card__nav-group--navigation .button {
	min-width: 120px;
	font-weight: 600;
	padding: 0.75rem 1.25rem;
	border-radius: 12px;
	transition: all 0.2s ease;
	background: white;
	border: 1.5px solid rgba(10, 102, 194, 0.15);
	color: var(--primary-600);
}

.lesson-card__nav-group--navigation .button:hover:not(:disabled) {
	background: var(--primary-600);
	color: white;
	border-color: var(--primary-600);
	transform: translateY(-2px);
	box-shadow: 0 4px 12px rgba(10, 102, 194, 0.2);
}

.lesson-card__nav-group--navigation .button:disabled {
	opacity: 0.35;
	cursor: not-allowed;
	background: rgba(0, 0, 0, 0.02);
}

.lesson-card__nav-group--actions {
	flex: 1 1 auto;
	justify-content: flex-end;
	gap: 0.625rem;
}

.lesson-card__nav-group--actions .button {
	padding: 0.75rem 1rem;
	border-radius: 12px;
	font-weight: 600;
	font-size: 0.9375rem;
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	transition: all 0.2s ease;
}

.lesson-card__nav-group--actions .button-icon {
	font-size: 1.125rem;
	line-height: 1;
}

.lesson-card__nav-group--actions .button:hover {
	transform: translateY(-2px);
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.lesson-card__nav-group--actions .button--success {
	background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
	border: none;
}

.lesson-card__nav-group--actions .button--success:disabled {
	opacity: 0.7;
}

.lesson-card__nav-group--actions .button--primary {
	box-shadow: 0 2px 8px rgba(10, 102, 194, 0.2);
}

.lesson-card__nav-group--actions .button--ghost {
	border: 1.5px solid rgba(0, 0, 0, 0.1);
}

.lesson-card__nav-group--actions .button--ghost:hover {
	background: rgba(0, 0, 0, 0.04);
	border-color: rgba(0, 0, 0, 0.2);
}

.lesson-card__lessons {
	display: grid;
	grid-gap: 1rem;
	gap: 1rem;
}

.lesson-card__lessons-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 1rem;
}

.lesson-card__lessons-title {
	font-size: 1rem;
	font-weight: 700;
}

.lesson-card__lessons-count {
	font-size: 0.9rem;
}

.lesson-card__lesson-list {
	display: grid;
	grid-gap: 0.75rem;
	gap: 0.75rem;
}

.lesson-card__lesson-item {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	padding: 0.8rem 1rem;
	border-radius: 14px;
	border: 1px solid rgba(148, 163, 184, 0.25);
	background: rgba(248, 250, 255, 0.65);
}

.lesson-card__lesson-meta {
	display: flex;
	align-items: flex-start;
	gap: 0.85rem;
}

.lesson-card__lesson-index {
	width: 32px;
	height: 32px;
	border-radius: 999px;
	display: grid;
	place-items: center;
	font-weight: 600;
	background: rgba(10, 102, 194, 0.18);
	color: var(--primary-600);
}

.lesson-card__lesson-title {
	font-weight: 600;
}

.lesson-card__lesson-objective {
	font-size: 0.85rem;
	margin-top: 0.2rem;
}

.lesson-card__lesson-duration {
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--primary-600);
}

.lesson-sidebar {
	background: rgba(255, 255, 255, 0.85);
	border-radius: var(--radius-lg);
	border: 1px solid rgba(10, 102, 194, 0.12);
	box-shadow: var(--shadow-sm);
	padding: clamp(1.4rem, 3vw, 1.8rem);
	display: flex;
	flex-direction: column;
	gap: 1.2rem;
	/* Fixed positioning - completely unscrollable */
	position: fixed;
	top: 5rem; /* Fixed position below navbar */
	right: calc((100vw - min(1480px, 98vw)) / 2); /* Match container's right margin */
	width: min(320px, 25vw); /* Responsive width */
	max-height: calc(100vh - 5rem);
	overflow: hidden;
	z-index: 10;
}

/* Hide mobile-only elements on desktop */
.lesson-card__sidebar-toggle,
.lesson-sidebar__close,
.lesson-card__comments-toggle {
	display: none;
}

/* Comments always visible on desktop */
.lesson-card--comments {
	padding: 1.5rem;
}

.lesson-card__comments-content {
	display: block;
}

.lesson-sidebar__header {
	display: block;
}

.lesson-sidebar__heading {
	font-size: clamp(1.1rem, 3vw, 1.3rem);
	font-weight: 700;
	margin: 0 0 0.5rem;
}

.lesson-sidebar__description {
	font-size: 0.9rem;
}

.lesson-list {
	display: grid;
	grid-gap: 0.5rem;
	gap: 0.5rem;
	overflow-y: auto; /* list scrolls within sticky sidebar */
	overflow-x: hidden; /* prevent horizontal scrollbar */
	flex: 1 1 auto;
}

.lesson-list__item {
	display: flex;
	align-items: center;
	justify-content: flex-start;
	gap: 0.6rem;
	/* Uniform height across all rows */
	height: 36px;
	padding: 0 0.8rem;
	width: 100%; /* prevent overflow causing horizontal scroll */
	border-radius: 12px;
	border: 1px solid rgba(10, 102, 194, 0.1);
	background: rgba(255, 255, 255, 0.7);
	cursor: pointer;
	transition: border 0.2s ease, background 0.2s ease, transform 0.2s ease;
	flex-wrap: nowrap;
}

.lesson-list__item--active {
	border-color: rgba(10, 102, 194, 0.32);
	background: rgba(10, 102, 194, 0.12);
	transform: translateX(2px);
}

.lesson-list__item--completed {
	background: rgba(34, 197, 94, 0.08);
	border-color: rgba(34, 197, 94, 0.2);
}

.lesson-list__item--completed .lesson-list__index {
	color: #22c55e;
	font-weight: 600;
}

.lesson-list__children {
	margin-left: 1.4rem; /* closer so 1.1 gap mirrors 01 gap */
	max-height: 200px; /* allow content-sized height up to a scroll threshold */
	overflow-y: auto;
	overflow-x: hidden; /* prevent horizontal scrollbar */
	display: grid;
	grid-gap: 0.5rem;
	gap: 0.5rem; /* match chapter spacing */
	align-content: start; /* do not stretch items to fill height */
	margin-top: 0.5rem; /* same gap between chapter and first subchapter */
}

.lesson-list__index {
	width: 28px;
	height: 28px; /* fits within 36px row height */
	border-radius: 999px;
	display: grid;
	place-items: center;
	font-size: 0.8rem;
	font-weight: 600;
	background: rgba(10, 102, 194, 0.12);
	color: var(--primary-600);
	flex: 0 0 28px; /* ensure left alignment consistency */
}

/* Subchapter rows: use compact index badge without circle to prevent overflow and keep left alignment clean */
.lesson-list__children .lesson-list__index {
	width: 28px;
	height: 28px; /* fits within 36px row height */
	border-radius: 6px;
	background: transparent;
	padding: 0;
	color: var(--text-500);
	display: grid;
	place-items: center;
	flex: 0 0 28px; /* match top-level index width */
}

.lesson-list__meta {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	flex: 1 1 auto;
	min-width: 0; /* allow ellipsis */
	overflow: hidden; /* contain children widths */
}

.lesson-list__title {
	font-weight: 600;
	font-size: 0.95rem;
	flex: 1 1 auto;
	min-width: 0; /* allow ellipsis */
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
	text-align: left;
	line-height: 1; /* avoid inflating parent height */
}

.lesson-list__duration {
	font-size: 0.75rem;
	color: var(--text-500);
	flex: 0 0 auto;
	white-space: nowrap;
	line-height: 1; /* avoid inflating parent height */
}

.lesson-list__chevron {
	margin-left: auto;
	color: var(--text-500);
	transition: transform 0.2s ease;
	flex: 0 0 auto;
}

.is-expanded .lesson-list__chevron {
	transform: rotate(90deg);
}

.lesson-list__children {
	margin-left: 1.4rem;
}

/* Prevent chips from causing height differences */
.lesson-list__item .chip {
	white-space: nowrap;
	font-size: 0.7rem;
	line-height: 1;
	height: 24px;
	padding: 0 8px;
	display: inline-flex;
	align-items: center;
	flex: 0 0 auto; /* don’t stretch and push content width */
}

.lesson-list__empty {
	padding: 1rem;
	border-radius: 12px;
	background: rgba(148, 163, 184, 0.12);
	text-align: center;
	font-size: 0.9rem;
	color: var(--text-500);
}

@media (max-width: 960px) {
	.course-detail__layout {
		grid-template-columns: 1fr;
	}
}

/* About Page */
.about-hero {
	text-align: center;
	display: grid;
	grid-gap: 1.5rem;
	gap: 1.5rem;
	margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.about-hero__title {
	font-size: clamp(2rem, 5vw, 2.8rem);
	font-weight: 700;
}

.about-hero__copy {
	max-width: 50rem;
	margin: 0 auto;
	font-size: clamp(1.05rem, 2.5vw, 1.25rem);
	color: var(--text-500);
}

.about-stats {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
	grid-gap: clamp(1.2rem, 4vw, 2rem);
	gap: clamp(1.2rem, 4vw, 2rem);
	margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.about-stats__number {
	font-size: clamp(2rem, 5vw, 2.6rem);
	font-weight: 700;
	color: var(--primary-600);
}

.about-stats__label {
	color: var(--text-500);
	font-size: 0.95rem;
}

.about-approach {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
	grid-gap: clamp(1.4rem, 4vw, 2rem);
	gap: clamp(1.4rem, 4vw, 2rem);
	margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.about-approach__item {
	display: flex;
	align-items: center;
	gap: 1.1rem;
}

.about-approach__index {
	width: 3.25rem;
	height: 3.25rem;
	border-radius: 999px;
	display: flex;
	align-items: center;
	justify-content: center;
	background: rgba(10, 102, 194, 0.12);
	color: var(--primary-600);
	font-weight: 700;
	font-size: 1.1rem;
}

.about-approach__text {
	font-size: 1.05rem;
	font-weight: 600;
}

.about-team {
	display: grid;
	grid-gap: 1rem;
	gap: 1rem;
	text-align: center;
	margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.about-team__copy {
	font-size: clamp(1rem, 2.5vw, 1.125rem);
	margin: 0 auto;
	max-width: 38rem;
}

.about-cta {
	display: grid;
	grid-gap: 1.4rem;
	gap: 1.4rem;
	text-align: center;
	padding: clamp(2rem, 6vw, 3rem);
}

/* Dashboard */
.dashboard-grid {
	display: grid;
	grid-gap: clamp(1.4rem, 3vw, 2rem);
	gap: clamp(1.4rem, 3vw, 2rem);
}

.dashboard-grid__main {
	display: grid;
	grid-gap: clamp(1.4rem, 3vw, 2rem);
	gap: clamp(1.4rem, 3vw, 2rem);
}

.dashboard-section {
	padding: clamp(1.6rem, 3vw, 2.1rem);
	border-radius: var(--radius-lg);
	background: linear-gradient(150deg, rgba(255, 255, 255, 0.9), rgba(232, 244, 251, 0.72));
	border: 1px solid rgba(10, 102, 194, 0.12);
	box-shadow: var(--shadow-sm);
	display: grid;
	grid-gap: clamp(1rem, 2vw, 1.4rem);
	gap: clamp(1rem, 2vw, 1.4rem);
}

.dashboard-section__header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 1.2rem;
}

.dashboard-activity {
	display: grid;
	grid-gap: 1.2rem;
	gap: 1.2rem;
}

.activity-item {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	padding: 0.9rem 1.1rem;
	border-radius: 14px;
	background: rgba(255, 255, 255, 0.7);
	border: 1px solid rgba(10, 102, 194, 0.08);
}

.activity-item__meta {
	display: grid;
	grid-gap: 0.2rem;
	gap: 0.2rem;
}

.activity-item__tag {
	display: inline-flex;
	align-items: center;
	gap: 0.35rem;
	padding: 0.25rem 0.55rem;
	border-radius: 999px;
	font-size: 0.75rem;
	font-weight: 600;
}

.activity-item__tag--success {
	background: rgba(34, 197, 94, 0.12);
	color: var(--success-500);
}

.activity-item__tag--error {
	background: rgba(239, 68, 68, 0.12);
	color: var(--danger-500);
}

.dashboard-section__title {
	font-size: clamp(1.2rem, 2.4vw, 1.5rem);
	font-weight: 600;
}

.section__title {
	font-size: clamp(1.4rem, 3vw, 1.9rem);
	font-weight: 700;
	margin: 0;
}

.dashboard-empty {
	padding: 2rem;
	border-radius: var(--radius-lg);
	border: 1px dashed rgba(10, 102, 194, 0.2);
	background: rgba(10, 102, 194, 0.08);
	text-align: center;
	color: var(--text-500);
}

/* Footer */
.footer {
	margin-top: clamp(2.5rem, 6vw, 4rem);
	padding: clamp(0.95rem, 2.4vw, 1.8rem) 0; /* ~80% of previous padding */
	border-top: 1px solid rgba(10, 102, 194, 0.12);
	background: rgba(255, 255, 255, 0.65);
	-webkit-backdrop-filter: var(--blur-backdrop);
	        backdrop-filter: var(--blur-backdrop);
}

.footer__inner {
	display: grid;
	grid-gap: clamp(0.8rem, 2vw, 1.28rem);
	gap: clamp(0.8rem, 2vw, 1.28rem); /* ~80% gap */
}

.footer__top {
	display: grid;
	grid-gap: clamp(0.8rem, 2vw, 1.28rem);
	gap: clamp(0.8rem, 2vw, 1.28rem); /* ~80% gap */
}

@media (min-width: 960px) {
	.footer__top {
		grid-template-columns: repeat(3, minmax(0, 1fr));
	}
}

.footer__brand-copy {
	color: var(--text-500);
	max-width: 36ch;
	font-size: 0.9rem; /* slightly smaller */
}

.footer__logo {
	display: inline-flex;
	align-items: center;
	gap: 0.6rem;
	margin-bottom: 0.4rem; /* ~80% */
}

/* Smaller logo in footer for compact height */
.footer__logo .logo__image {
	height: 28px; /* ~80% of a typical 35px/32px scale */
}

.footer__column-title {
	font-size: 1rem;
	font-weight: 600;
	color: var(--text-700);
	margin-bottom: 0.4rem; /* ~80% */
}

.footer__link {
	display: inline-flex;
	align-items: center;
	gap: 0.35rem;
	color: var(--text-500);
	font-size: 0.9rem;
	padding: 0.2rem 0; /* ~80% vertical padding */
	transition: color 0.2s ease;
}

.footer__link:hover {
	color: var(--primary-600);
}

.footer__bottom {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	align-items: center;
	gap: 1rem;
	padding-top: clamp(0.72rem, 2vw, 1.12rem); /* ~80% top spacing */
	color: var(--text-300);
	font-size: 0.85rem;
}

.footer__social {
	display: flex;
	gap: 0.4rem; /* ~80% */
}

.footer__social-link {
	display: inline-flex;
	align-items: center;
	padding: 0.2rem 0.45rem; /* ~80% pill padding */
	border-radius: 999px;
	background: rgba(10, 102, 194, 0.08);
	color: var(--primary-600);
	font-weight: 600;
	font-size: 0.8rem;
}

.footer__social-link:hover {
	background: rgba(10, 102, 194, 0.14);
}

/* Ensure footer link lists are evenly spaced even if utility classes aren't present */
.footer__top nav {
	display: grid;
	grid-gap: 0.2rem;
	gap: 0.2rem; /* ~80% */
}

.filter-group {
	display: flex;
	flex-wrap: wrap;
	gap: 0.6rem;
	padding: 0.35rem;
	border-radius: 999px;
	background: rgba(10, 102, 194, 0.08);
}

.filter-pill {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.4rem 0.95rem;
	border-radius: 999px;
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--primary-600);
	background: transparent;
	border: none;
	cursor: pointer;
	transition: background 0.2s ease, color 0.2s ease;
}

.filter-pill--active {
	background: #fff;
	color: var(--primary-600);
	box-shadow: 0 10px 25px rgba(79, 70, 229, 0.12);
}

.filter-pill:hover {
	background: rgba(255, 255, 255, 0.75);
}

.avatar {
	width: 40px;
	height: 40px;
	border-radius: 999px;
	background: linear-gradient(135deg, var(--primary-600), #22d3ee);
	color: #fff;
	font-weight: 600;
	font-size: 0.95rem;
	display: grid;
	place-items: center;
	border: none;
	cursor: pointer;
}

.dropdown {
	position: relative;
}

.dropdown__menu {
	position: absolute;
	top: calc(100% + 0.6rem);
	right: 0;
	min-width: 220px;
	padding: 0.9rem;
	border-radius: 18px;
	background: rgba(255, 255, 255, 0.95);
	-webkit-backdrop-filter: var(--blur-backdrop);
	        backdrop-filter: var(--blur-backdrop);
	box-shadow: var(--shadow-md);
	border: 1px solid rgba(10, 102, 194, 0.12);
	z-index: 40;
	display: grid;
	grid-gap: 0.45rem;
	gap: 0.45rem;
}

.dropdown__item {
	display: flex;
	flex-direction: column;
	align-items: flex-start;
	gap: 0.2rem;
	padding: 0.55rem 0.7rem;
	border-radius: 12px;
	background: transparent;
	border: none;
	color: var(--text-700);
	font-size: 0.9rem;
	cursor: pointer;
	transition: background 0.2s ease;
}

.dropdown__item--muted {
	pointer-events: none;
	color: var(--text-500);
}

.dropdown__item:hover {
	background: rgba(10, 102, 194, 0.08);
}

.dropdown__divider {
	height: 1px;
	background: rgba(10, 102, 194, 0.12);
	margin: 0.2rem 0;
}

.auth-modal {
	width: min(440px, 96vw);
	border-radius: 24px;
	background: linear-gradient(160deg, rgba(255, 255, 255, 0.98), rgba(238, 241, 255, 0.94));
	border: 1px solid rgba(10, 102, 194, 0.18);
	box-shadow: var(--shadow-lg);
	padding: clamp(1.8rem, 4vw, 2.3rem);
	position: relative;
}

.auth-modal__header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 1rem;
	margin-bottom: 1.4rem;
}

.auth-modal__title {
	font-size: 1.5rem;
	font-weight: 700;
	letter-spacing: -0.02em;
}

.auth-modal__close {
	border: none;
	background: rgba(10, 102, 194, 0.12);
	color: var(--primary-600);
	width: 36px;
	height: 36px;
	border-radius: 999px;
	display: grid;
	place-items: center;
	cursor: pointer;
	transition: background 0.2s ease;
}

.auth-modal__close:hover {
	background: rgba(10, 102, 194, 0.18);
}

.auth-modal__tabs {
	display: inline-flex;
	gap: 0.5rem;
	padding: 0.35rem;
	border-radius: 999px;
	background: rgba(10, 102, 194, 0.12);
	margin-bottom: 1.8rem;
}

.auth-modal__tab {
	border: none;
	background: transparent;
	padding: 0.45rem 1.2rem;
	border-radius: 999px;
	font-weight: 600;
	font-size: 0.9rem;
	color: var(--primary-600);
	cursor: pointer;
	transition: background 0.2s ease;
}

.auth-modal__tab--active {
	background: #fff;
	box-shadow: 0 8px 18px rgba(79, 70, 229, 0.14);
}

.form-field {
	display: grid;
	grid-gap: 0.45rem;
	gap: 0.45rem;
	margin-bottom: 1.15rem;
}

.form-label {
	font-weight: 600;
	font-size: 0.9rem;
	color: var(--text-700);
}

.form-input {
	width: 100%;
	padding: 0.65rem 0.9rem;
	border-radius: 12px;
	border: 1px solid rgba(10, 102, 194, 0.2);
	background: rgba(255, 255, 255, 0.9);
	transition: border 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus {
	outline: none;
	border-color: var(--primary-500);
	box-shadow: 0 0 0 3px rgba(10, 102, 194, 0.18);
}

.form-message {
	font-size: 0.85rem;
	font-weight: 500;
}

.form-message--error {
	color: var(--danger-500);
}

.form-message--success {
	color: var(--success-500);
}

.form-footnote {
	margin-top: 1.3rem;
	text-align: center;
	font-size: 0.85rem;
	color: var(--text-500);
}

.hint-box {
	margin-top: 1rem;
	padding: 0.85rem 1rem;
	border-radius: 14px;
	border: 1px solid rgba(10, 102, 194, 0.14);
	background: rgba(10, 102, 194, 0.08);
	color: var(--text-700);
}

.quiz-card {
	display: grid;
	grid-gap: 1.5rem;
	gap: 1.5rem;
	max-width: 640px;
}

.quiz-card__header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 1rem;
}

.quiz-card__title {
	display: grid;
	grid-gap: 0.4rem;
	gap: 0.4rem;
}

.quiz-card__label {
	font-size: 0.9rem;
	font-weight: 600;
	color: var(--primary-600);
}

.quiz-card__heading {
	font-size: clamp(1.2rem, 3vw, 1.5rem);
	font-weight: 700;
}

.quiz-card__question {
	padding: 1.1rem 1.25rem;
	border-radius: 16px;
	background: rgba(15, 23, 42, 0.03);
	border: 1px solid rgba(148, 163, 184, 0.2);
	display: grid;
	grid-gap: 0.5rem;
	gap: 0.5rem;
}

.quiz-card__prompt {
	font-size: clamp(1.05rem, 3vw, 1.25rem);
	font-weight: 600;
}

.quiz-card__context {
	font-size: 0.95rem;
	color: var(--text-500);
}

.quiz-card__options {
	display: grid;
	grid-gap: 0.75rem;
	gap: 0.75rem;
}

/* Prevent long math/text from overflowing the card */
.quiz-card__question,
.radio-option span,
.hint-box {
	word-break: break-word;
	overflow-wrap: anywhere;
}

/* Ensure selectors stay within the card and are responsive */
.quiz-selectors {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	grid-gap: 0.5rem;
	gap: 0.5rem;
}

.quiz-selectors .input-field,
.quiz-selectors select,
.quiz-selectors input {
	width: 100%;
	max-width: 100%;
	box-sizing: border-box;
}

@media (max-width: 640px) {
	.quiz-selectors {
		grid-template-columns: 1fr;
	}
}

.quiz-card__controls {
	display: flex;
	gap: 0.75rem;
	flex-wrap: wrap;
}

.quiz-card__explanation {
	padding: 1rem 1.1rem;
	border-radius: 14px;
	background: rgba(10, 102, 194, 0.08);
	border: 1px solid rgba(10, 102, 194, 0.16);
	font-size: 0.95rem;
}

/* Practice (Quizzes) page layout */
.practice-layout {
	display: grid;
	grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
	grid-gap: 1rem;
	gap: 1rem;
	align-items: start; /* prevent sidebar from stretching to tallest column */
}

.practice-main {
	min-width: 0; /* prevent overflow */
}

.practice-aside {
	display: grid;
	grid-gap: 0.75rem;
	gap: 0.75rem;
	position: -webkit-sticky;
	position: sticky;
	top: 88px; /* beneath navbar */
	align-self: start; /* keep aside sized to its content */
}

@media (max-width: 900px) {
	.practice-layout {
		grid-template-columns: 1fr;
	}
	.practice-aside {
		position: static;
		top: auto;
	}
}

.quiz-status {
	display: flex;
	flex-wrap: wrap;
	gap: 0.4rem 0.5rem;
	align-items: center;
	margin-top: 1rem;
}

/* New Quiz Layout */
.quiz-layout {
	display: grid;
	grid-template-columns: 400px 1fr;
	grid-gap: 1.5rem;
	gap: 1.5rem;
	align-items: start;
}

.quiz-filters {
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.quiz-selectors {
	display: flex;
	flex-direction: column;
	gap: 1rem;
	margin-top: 1rem;
}

.form-group {
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.quiz-panel {
	min-height: 400px;
}

.quiz-placeholder {
	min-height: 400px;
	display: flex;
	align-items: center;
	justify-content: center;
}

.quiz-placeholder__content {
	text-align: center;
	max-width: 400px;
}

.quiz-placeholder__content h3 {
	font-size: 1.5rem;
	margin-bottom: 0.5rem;
	color: var(--text-900);
}

.quiz-placeholder__icon {
	font-size: 4rem;
	margin-top: 1rem;
	opacity: 0.3;
}

@media (max-width: 960px) {
	.quiz-layout {
		grid-template-columns: 1fr;
	}
}

/* Full-height, non-scrolling Quizzes screen */
.practice-screen {
	/* Make this section fill the viewport below the sticky navbar */
	min-height: calc(100vh - var(--navbar-height));
	padding: clamp(1rem, 3vw, 1.5rem) 0; /* tighter to reduce overflow risk */
}

.practice-screen__inner {
	display: grid;
	grid-template-rows: auto 1fr; /* header + content */
	min-height: inherit; /* propagate min-height to children */
}

.practice-screen__header {
	display: grid;
	grid-gap: 0.4rem;
	gap: 0.4rem;
	margin-bottom: 0.5rem;
}

.practice-screen__content {
	/* Occupy the remaining height; prevent page scroll */
	height: 100%;
	overflow: hidden; /* contain scroll to internal regions */
	/* Rebalance columns so the left (filters) is narrower and the right (quiz) is wider */
	grid-template-columns: minmax(0, 1fr) minmax(0, 3fr);
}

.practice-screen__main {
	height: 100%;
	overflow: auto; /* enable internal scroll if needed */
	display: grid;
	place-items: start center; /* center quiz card while keeping top context */
}

.quiz-stage {
	width: 100%;
	max-width: 880px; /* give the quiz more breathing room */
	padding: 0.5rem; /* breathing room for internal scrollbars */
}

.practice-screen__aside {
	height: 100%;
	overflow: auto; /* aside scrolls independently */
	position: static; /* disable sticky to avoid layout overflow */
	top: auto;
	align-self: stretch;
}

/* Vertical filter layout for the aside */
.quiz-selectors--vertical {
	grid-template-columns: 1fr;
}

/* Make aside info cards more compact */
.aside-mini .card--compact {
	padding: 0.75rem;
}
.aside-mini .card__title {
	font-size: 0.95rem;
	margin-bottom: 0.25rem;
}
.aside-mini .list--bulleted {
	font-size: 0.9rem;
}
.aside-mini .text-muted {
	font-size: 0.85rem;
}

/* Comments */
.comments {
	display: grid;
	grid-gap: 1rem;
	gap: 1rem;
}

.comments__form textarea {
	background: rgba(255, 255, 255, 0.9);
}

.comments__list {
	display: grid;
	grid-gap: 0.9rem;
	gap: 0.9rem;
}

.comment {
	display: grid;
	grid-template-columns: 32px 1fr;
	grid-gap: 0.8rem;
	gap: 0.8rem;
}

.comment--reply {
	margin-top: 0.6rem;
}

.comment__avatar {
	width: 32px;
	height: 32px;
	border-radius: 8px;
	display: grid;
	place-items: center;
	background: rgba(10, 102, 194, 0.12);
	color: var(--primary-600);
	font-size: 0.9rem;
}

.comment__body {
	display: grid;
	grid-gap: 0.35rem;
	gap: 0.35rem;
}

.comment__meta {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	font-size: 0.9rem;
}

.comment__text {
	white-space: pre-wrap;
}

.comment__actions {
	margin-top: 0.25rem;
}

.comment__replies {
	display: grid;
	grid-gap: 0.6rem;
	gap: 0.6rem;
	margin-top: 0.4rem;
}

.comment__reply-form {
	margin-top: 0.6rem;
	display: grid;
	grid-gap: 0.5rem;
	gap: 0.5rem;
}

.quiz-page {
	display: grid;
	grid-gap: 1.6rem;
	gap: 1.6rem;
}

.quiz-page__filters {
	display: flex;
	flex-wrap: wrap;
	gap: 0.6rem;
	margin-bottom: 0.4rem;
}

.radio-option {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	padding: 0.75rem 1rem;
	border-radius: 14px;
	border: 1px solid rgba(10, 102, 194, 0.16);
	background: rgba(255, 255, 255, 0.85);
	cursor: pointer;
	transition: border 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.radio-option:hover {
	border-color: rgba(10, 102, 194, 0.32);
	background: rgba(10, 102, 194, 0.12);
}

.radio-option input {
	accent-color: var(--primary-600);
}

.text-success {
	color: var(--success-500);
}

.text-danger {
	color: var(--danger-500);
}

.loading-spinner {
	width: 44px;
	height: 44px;
	border-radius: 999px;
	border: 4px solid rgba(10, 102, 194, 0.15);
	border-top-color: var(--primary-600);
	animation: spin 0.8s linear infinite;
}

@keyframes spin {
	to {
		transform: rotate(360deg);
	}
}

/* Utilities */
.text-center {
	text-align: center;
}

.text-muted {
	color: var(--text-500);
}

.hidden {
	display: none !important;
}

@media (max-width: 768px) {
	.navbar__inner {
		padding: 0.85rem 0;
	}

	.hero-card__metric {
		grid-template-columns: 1fr;
	}

		/* On mobile, stack footer content vertically for clarity */
		.course-card__footer {
			flex-direction: column;
			align-items: flex-start;
		}

	.hero-visual__row {
		flex-direction: column;
		align-items: flex-start;
		gap: 0.35rem;
	}

	.course-modal__header {
		flex-direction: column;
		align-items: flex-start;
	}

	.course-modal__footer {
		justify-content: flex-start;
	}
}

/* Modal styles for admin edit forms */
.modal {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: rgba(15, 23, 42, 0.6);
	-webkit-backdrop-filter: blur(4px);
	        backdrop-filter: blur(4px);
	display: none;
	align-items: center;
	justify-content: center;
	z-index: 9999;
	padding: 1rem;
	overflow-y: auto;
}

.modal--active {
	display: flex;
}

.modal__content {
	background: var(--surface);
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-lg);
	width: 100%;
	max-width: 900px;
	max-height: 90vh;
	display: flex;
	flex-direction: column;
	animation: modalSlideIn 0.2s ease-out;
}

@keyframes modalSlideIn {
	from {
		opacity: 0;
		transform: translateY(-20px) scale(0.98);
	}
	to {
		opacity: 1;
		transform: translateY(0) scale(1);
	}
}

.modal__header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 1.5rem;
	border-bottom: 1px solid var(--border);
}

.modal__title {
	font-size: 1.25rem;
	font-weight: 600;
	color: var(--text-900);
	margin: 0;
}

.modal__close {
	background: none;
	border: none;
	font-size: 1.75rem;
	line-height: 1;
	color: var(--text-500);
	cursor: pointer;
	padding: 0.25rem;
	width: 2rem;
	height: 2rem;
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: var(--radius-sm);
	transition: all 0.2s;
}

.modal__close:hover {
	background: var(--background-accent);
	color: var(--text-900);
}

.modal__body {
	padding: 1.5rem;
	overflow-y: auto;
	flex: 1;
}

/* ========================================
   Progress Dashboard
   ======================================== */

.progress-dashboard {
	max-width: 1200px;
	margin: 0 auto;
	padding: 2rem 1rem;
}

.progress-dashboard__header {
	margin-bottom: 2rem;
}

.progress-dashboard__header h2 {
	margin: 0 0 0.5rem 0;
	color: var(--text-900);
}

.progress-dashboard__stats {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
	grid-gap: 1rem;
	gap: 1rem;
	margin-bottom: 2rem;
}

.stat-card {
	background: linear-gradient(135deg, rgba(10, 102, 194, 0.05), rgba(10, 102, 194, 0.02));
	border: 1px solid rgba(10, 102, 194, 0.1);
	border-radius: 16px;
	padding: 1.5rem;
	text-align: center;
	transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
	transform: translateY(-2px);
	box-shadow: 0 4px 12px rgba(10, 102, 194, 0.1);
}

.stat-card__icon {
	font-size: 2rem;
	margin-bottom: 0.5rem;
}

.stat-card__value {
	font-size: 2rem;
	font-weight: 700;
	color: var(--text-900);
	margin-bottom: 0.25rem;
}

.stat-card__label {
	font-size: 0.875rem;
	color: var(--text-600);
	text-transform: uppercase;
	letter-spacing: 0.05em;
}

.progress-dashboard__badges,
.progress-dashboard__courses {
	margin-bottom: 2rem;
}

.progress-dashboard__badges h3,
.progress-dashboard__courses h3 {
	margin: 0 0 1rem 0;
	color: var(--text-900);
}

.badge-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
	grid-gap: 1rem;
	gap: 1rem;
}

.achievement-badge {
	background: white;
	border: 1px solid rgba(0, 0, 0, 0.08);
	border-radius: 12px;
	padding: 1rem;
	text-align: center;
	transition: transform 0.2s ease;
}

.achievement-badge:hover {
	transform: scale(1.05);
}

.achievement-badge__icon {
	font-size: 2.5rem;
	margin-bottom: 0.5rem;
}

.achievement-badge__name {
	font-size: 0.875rem;
	font-weight: 600;
	color: var(--text-700);
}

.course-progress-list {
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.course-progress-item {
	background: white;
	border: 1px solid rgba(0, 0, 0, 0.08);
	border-radius: 12px;
	padding: 1rem;
}

.course-progress-item__header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 0.5rem;
}

.course-progress-item__name {
	font-weight: 600;
	color: var(--text-900);
}

.course-progress-item__points {
	font-weight: 700;
	color: var(--primary);
}

.course-progress-item__stats {
	display: flex;
	justify-content: space-between;
	align-items: center;
	font-size: 0.875rem;
}

.course-progress-item__streak {
	color: #f97316;
	font-weight: 600;
}

/* ========================================
   Video Player
   ======================================== */

.video-player {
	position: relative;
	width: 100%;
	height: 100%;
	background: #000;
	border-radius: 8px;
	overflow: hidden;
}

.video-player__video {
	width: 100%;
	height: 100%;
	display: block;
	cursor: pointer;
}

.video-player__controls {
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
	background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
	padding: 1rem 0.75rem 0.5rem;
	transition: opacity 0.3s ease;
}

.video-player__progress-container {
	width: 100%;
	height: 6px;
	background: rgba(255, 255, 255, 0.3);
	border-radius: 3px;
	cursor: pointer;
	margin-bottom: 0.75rem;
}

.video-player__progress-bar {
	height: 100%;
	position: relative;
}

.video-player__progress-filled {
	height: 100%;
	background: var(--primary);
	border-radius: 3px;
	transition: width 0.1s linear;
}

.video-player__controls-row {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 0.5rem;
}

.video-player__controls-left,
.video-player__controls-right {
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.video-player__button {
	background: transparent;
	border: none;
	color: white;
	font-size: 1.25rem;
	cursor: pointer;
	padding: 0.25rem 0.5rem;
	border-radius: 4px;
	transition: background 0.2s ease;
	display: flex;
	align-items: center;
	justify-content: center;
}

.video-player__button:hover {
	background: rgba(255, 255, 255, 0.2);
}

.video-player__volume-slider {
	width: 80px;
	cursor: pointer;
}

.video-player__time {
	color: white;
	font-size: 0.875rem;
	white-space: nowrap;
}

.video-player__speed-select {
	background: rgba(255, 255, 255, 0.2);
	border: 1px solid rgba(255, 255, 255, 0.3);
	color: white;
	padding: 0.25rem 0.5rem;
	border-radius: 4px;
	font-size: 0.875rem;
	font-weight: 600;
	cursor: pointer;
	transition: background 0.2s ease;
}

.video-player__speed-select:hover {
	background: rgba(255, 255, 255, 0.3);
}

.video-player__speed-select option {
	background: #1a1a1a;
	color: white;
}

.video-player__youtube-note {
	position: absolute;
	bottom: 0.5rem;
	left: 0.5rem;
	right: 0.5rem;
	background: rgba(0, 0, 0, 0.7);
	color: white;
	padding: 0.5rem;
	border-radius: 4px;
	text-align: center;
}

/* ========================================
   Flashcards
   ======================================== */

.flashcard-deck {
	background: white;
	border-radius: 12px;
	padding: 1.5rem;
	max-width: 800px;
	margin: 0 auto;
}

.flashcard-deck__header {
	display: flex;
	justify-content: space-between;
	align-items: flex-start;
	margin-bottom: 1.5rem;
	gap: 1rem;
}

.flashcard-deck__header h3 {
	margin: 0 0 0.25rem 0;
}

.flashcard-deck__actions {
	display: flex;
	gap: 0.5rem;
}

.flashcard-empty {
	text-align: center;
	padding: 3rem 1rem;
}

.flashcard-container {
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.flashcard {
	perspective: 1000px;
	min-height: 400px;
	cursor: pointer;
	position: relative;
}

.flashcard__inner {
	position: relative;
	width: 100%;
	height: 100%;
	min-height: 400px;
	transition: transform 0.6s;
	transform-style: preserve-3d;
}

.flashcard--flipped .flashcard__inner {
	transform: rotateY(180deg);
}

.flashcard__front,
.flashcard__back {
	position: absolute;
	width: 100%;
	min-height: 400px;
	-webkit-backface-visibility: hidden;
	        backface-visibility: hidden;
	border-radius: 12px;
	padding: 2rem;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	text-align: center;
	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.flashcard__front {
	background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
	color: white;
}

.flashcard__back {
	background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
	color: white;
	transform: rotateY(180deg);
}

.flashcard--mastered .flashcard__front {
	background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.flashcard--difficult .flashcard__front {
	background: linear-gradient(135deg, #fc4a1a 0%, #f7b733 100%);
}

.flashcard__label {
	font-size: 0.875rem;
	text-transform: uppercase;
	letter-spacing: 0.1em;
	opacity: 0.9;
	margin-bottom: 1rem;
	font-weight: 600;
}

.flashcard__content {
	font-size: 1.5rem;
	font-weight: 600;
	line-height: 1.4;
	margin-bottom: 1rem;
	flex: 1;
	display: flex;
	align-items: center;
	justify-content: center;
}

.flashcard__content--answer {
	font-size: 1.75rem;
	font-weight: 700;
}

.flashcard__hint-text {
	font-size: 0.875rem;
	opacity: 0.8;
	margin-top: auto;
}

.flashcard__hint,
.flashcard__explanation {
	font-size: 0.875rem;
	text-align: left;
	background: rgba(255, 255, 255, 0.2);
	padding: 0.75rem;
	border-radius: 8px;
	margin-top: 1rem;
	line-height: 1.5;
}

.flashcard-controls {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 1rem;
}

.flashcard-controls__rating {
	display: flex;
	gap: 0.5rem;
}

.flashcard-progress {
	height: 4px;
	background: rgba(0, 0, 0, 0.1);
	border-radius: 2px;
	overflow: hidden;
}

.flashcard-progress__bar {
	height: 100%;
	background: var(--primary);
	transition: width 0.3s ease;
}

/* ========================================
   Notification Center
   ======================================== */

.notification-center {
	background: white;
	border-radius: 12px;
	box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
	max-width: 500px;
	width: 100%;
	max-height: 600px;
	display: flex;
	flex-direction: column;
}

.notification-center__header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 1rem 1.5rem;
	border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.notification-center__header h3 {
	margin: 0;
}

.notification-center__tabs {
	display: flex;
	border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.notification-center__tab {
	flex: 1;
	padding: 0.75rem 1rem;
	background: transparent;
	border: none;
	font-weight: 500;
	color: var(--text-600);
	cursor: pointer;
	transition: all 0.2s ease;
	border-bottom: 2px solid transparent;
}

.notification-center__tab:hover {
	background: rgba(0, 0, 0, 0.02);
}

.notification-center__tab--active {
	color: var(--primary);
	border-bottom-color: var(--primary);
}

.notification-center__content {
	flex: 1;
	overflow-y: auto;
	padding: 1rem;
}

.notification-center__loading {
	display: flex;
	justify-content: center;
	align-items: center;
	padding: 3rem;
}

.notification-list,
.reminder-list {
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.notification-list__header,
.reminder-list__header {
	display: flex;
	justify-content: flex-end;
	margin-bottom: 0.5rem;
}

.notification-item,
.reminder-item {
	display: flex;
	gap: 0.75rem;
	padding: 0.75rem;
	background: rgba(10, 102, 194, 0.04);
	border-radius: 8px;
	border: 1px solid rgba(10, 102, 194, 0.1);
	transition: transform 0.2s ease;
}

.notification-item:hover,
.reminder-item:hover {
	transform: translateX(2px);
}

.notification-item__icon {
	font-size: 1.5rem;
	flex-shrink: 0;
}

.notification-item__content,
.reminder-item__content {
	flex: 1;
}

.notification-item__title,
.reminder-item__title {
	font-weight: 600;
	color: var(--text-900);
	margin-bottom: 0.25rem;
}

.notification-item__message,
.reminder-item__message {
	font-size: 0.875rem;
	color: var(--text-700);
	margin-bottom: 0.25rem;
}

.notification-item__time,
.reminder-item__schedule {
	font-size: 0.75rem;
	color: var(--text-500);
}

.notification-item__dismiss,
.reminder-item__delete {
	background: transparent;
	border: none;
	cursor: pointer;
	font-size: 1.25rem;
	color: var(--text-500);
	padding: 0.25rem;
	border-radius: 4px;
	transition: all 0.2s ease;
}

.notification-item__dismiss:hover {
	background: rgba(34, 197, 94, 0.1);
	color: #22c55e;
}

.reminder-item__delete:hover {
	background: rgba(239, 68, 68, 0.1);
	color: #ef4444;
}

.notification-empty {
	text-align: center;
	padding: 3rem 1rem;
	color: var(--text-600);
}

.notification-empty p:first-child {
	font-size: 1.5rem;
	margin-bottom: 0.5rem;
}

.notification-settings {
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
}

.notification-settings h4 {
	margin: 0 0 1rem 0;
}

.notification-setting {
	padding-bottom: 1rem;
	border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.notification-setting:last-child {
	border-bottom: none;
}

.notification-setting__label {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	font-weight: 500;
	margin-bottom: 0.5rem;
	cursor: pointer;
}

.notification-setting__label input[type="checkbox"] {
	width: 1.25rem;
	height: 1.25rem;
	cursor: pointer;
}

.notification-setting__time-input {
	padding: 0.5rem;
	border: 1px solid rgba(0, 0, 0, 0.2);
	border-radius: 6px;
	font-size: 0.875rem;
	margin-left: auto;
}

.notification-setting .text-muted {
	margin: 0;
	font-size: 0.875rem;
}

/* ========================================
   Hide YouTube End Screen Overlay
   ======================================== */

/* Try to hide YouTube's end screen suggestions using CSS */
.lesson-card__media iframe {
	position: relative;
	z-index: 1;
}

/* This won't completely hide YouTube suggestions as they're inside the iframe,
   but we can add an overlay when the video ends */
.lesson-card__media {
	position: relative;
}


.modal__footer {
	display: flex;
	align-items: center;
	justify-content: flex-end;
	gap: 0.75rem;
	padding: 1.5rem;
	border-top: 1px solid var(--border);
}
/* Mobile-First Responsive Fixes */

/* Ensure proper viewport behavior on mobile */
html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

/* Prevent horizontal scroll on mobile */
body {
  overflow-x: hidden;
  width: 100%;
}

*, *::before, *::after {
  box-sizing: border-box;
}

/* Container padding for mobile */
@media (max-width: 768px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
    max-width: 100%;
    width: 100%;
  }
  
  /* Remove negative margins on mobile */
  .course-detail__layout,
  .page-header:has(.filter-group),
  .page-header:has(+ .quiz-layout),
  .dashboard-grid .page-header {
    margin-top: 0 !important;
  }
  
  /* Section spacing */
  .section {
    padding: 1.5rem 0;
  }
  
  /* Navbar improvements - Minimal and Seamless */
  .navbar {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: 100;
    background: white;
    border-bottom: 1px solid #f3f4f6;
    box-shadow: none;
  }
  
  .navbar__inner {
    padding: 1rem 1rem;
    gap: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .logo {
    font-size: 1rem;
    gap: 0;
    flex: 1;
    text-align: center;
    position: static;
    transform: none;
  }
  
  .logo__image {
    display: none;
  }
  
  .logo__text {
    display: inline;
    font-size: 1.0625rem;
    color: #6b7280;
    font-weight: 600;
    letter-spacing: -0.01em;
  }
  
  /* Mobile Menu Toggle - Minimal */
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: #111827;
    cursor: pointer;
    padding: 0;
    margin: 0;
    flex-shrink: 0;
    transition: opacity 0.2s ease;
  }
  
  .mobile-menu-toggle:active {
    opacity: 0.6;
  }
  
  /* Mobile Navigation Menu - Seamless Slide-in */
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100vw;
    height: 100vh;
    background: white;
    box-shadow: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0;
    transition: right 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
    overflow-y: auto;
  }
  
  .nav-links--mobile-open {
    right: 0;
  }
  
  /* Menu header with close button */
  .nav-links::before {
    content: '';
    display: block;
    height: 60px;
    border-bottom: 1px solid #f3f4f6;
    flex-shrink: 0;
  }
  
  .nav-link {
    width: 100%;
    padding: 1.125rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: #6b7280;
    border-radius: 0;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0;
    transition: all 0.15s ease;
    border: none;
    border-bottom: 1px solid #f3f4f6;
    background: white;
  }
  
  .nav-link:active {
    background: #fafafa;
  }
  
  .nav-link.active {
    background: #f9fafb;
    color: #374151;
    font-weight: 600;
    border-left: 3px solid #6b7280;
    padding-left: calc(1.5rem - 3px);
  }
  
  .nav-link--mobile-only {
    display: flex;
    margin-top: 0;
    padding-top: 1.125rem;
    border-top: 1px solid #f3f4f6;
  }
  
  .nav-link--mobile-only:first-of-type {
    margin-top: 1rem;
    border-top: 4px solid #f3f4f6;
  }
  
  .nav-link--button {
    background: white;
    border: none;
    border-bottom: 1px solid #f3f4f6;
    color: #6b7280;
    text-align: left;
    justify-content: flex-start;
    cursor: pointer;
    font-weight: 500;
  }
  
  .nav-link--button:active {
    background: #fafafa;
  }
  
  .nav-link--primary {
    font-weight: 600;
  }
  
  /* Backdrop overlay for mobile menu */
  .mobile-menu-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }
  
  .mobile-menu-backdrop--visible {
    opacity: 1;
    pointer-events: auto;
  }
  
  /* Hide desktop nav actions on mobile, only show avatar if logged in */
  .nav-actions {
    gap: 0.625rem;
    order: 2;
  }
  
  .nav-actions__dashboard,
  .nav-actions__signin,
  .nav-actions__signup {
    display: none;
  }
  
  .nav-actions .avatar {
    width: 40px;
    height: 40px;
    font-size: 0.875rem;
    border: 2px solid rgba(10, 102, 194, 0.2);
    box-shadow: 0 2px 6px rgba(10, 102, 194, 0.15);
  }
  
  .nav-actions .button {
    font-size: 0.875rem;
    padding: 0.625rem 1rem;
    white-space: nowrap;
  }
  
  /* Hero section */
  .hero {
    padding: 1.5rem 0 2rem;
  }
  
  .hero--full {
    min-height: auto;
    height: auto;
    padding: 1.5rem 0 2rem;
    margin-top: 0;
  }
  
  .section .hero--full {
    margin-top: 0;
  }
  
  .grid--hero {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-top: 0;
  }
  
  .hero-visual {
    order: -1;
    margin-top: 0;
    padding-top: 0;
  }
  
  .hero-visual__image {
    max-height: 250px;
    object-fit: cover;
    display: block;
  }
  
  .hero-visual__grid {
    display: none;
  }
  
  .hero-card {
    margin-top: 1.5rem;
  }
  
  .hero-card__metric {
    flex-direction: column;
    gap: 1rem;
  }
  
  .hero__badge {
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
  }
  
  .hero__title {
    font-size: clamp(1.875rem, 7vw, 2.5rem);
    line-height: 1.15;
    margin-bottom: 1rem;
  }
  
  .hero__description {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
  }
  
  .hero__actions {
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    margin-bottom: 2rem;
  }
  
  .hero__actions .button {
    width: 100%;
    justify-content: center;
  }
  
  .hero-card {
    margin-bottom: 2rem;
  }
  
  .hero-card__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .hero-card__metric {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  
  .hero-card__metric-item h4 {
    font-size: 1.5rem;
  }
  
  .hero-visual {
    margin-top: 2rem;
  }
  
  .hero-visual__image {
    max-height: 280px;
    border-radius: var(--radius-lg);
  }
  
  .hero-visual__grid {
    margin-top: 1.5rem;
    gap: 1rem;
  }
  
  .hero-visual__row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    padding: 1rem;
  }
  
  .hero-visual__row span {
    font-size: 0.9375rem;
  }
  
  .hero-visual__row small {
    font-size: 0.8125rem;
  }
  
  .grid--hero {
    grid-template-columns: 1fr;
    gap: 0;
  }
  
  /* Cards */
  .card {
    padding: 1.25rem;
  }
  
  .card__title {
    font-size: 1.125rem;
  }
  
  .course-card {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .course-card__head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .course-card__badge {
    font-size: 0.75rem;
  }
  
  .course-card__title {
    font-size: 1.25rem;
    line-height: 1.3;
    margin: 0;
  }
  
  .course-card__description {
    font-size: 0.9375rem;
    line-height: 1.6;
    margin: 0;
  }
  
  .course-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.875rem;
  }
  
  .course-meta__item {
    white-space: nowrap;
  }
  
  .course-card__footer {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 0.5rem;
  }
  
  .course-progress {
    width: 100%;
  }
  
  .course-card__actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
  }
  
  .course-card__actions .button {
    width: 100%;
  }
  
  .course-card__cta {
    width: 100%;
    justify-content: center;
    padding: 0.75rem;
    font-size: 0.9375rem;
  }
  
  /* Grid layouts */
  .grid--courses {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .grid {
    gap: 1.5rem;
  }
  
  .grid--metrics {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .grid {
    gap: 1.5rem;
  }
  
  /* Quiz layout */
  .quiz-layout {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .quiz-filters {
    width: 100%;
  }
  
  .quiz-panel {
    width: 100%;
  }
  
  .practice-screen {
    flex-direction: column;
  }
  
  .practice-screen__aside {
    width: 100%;
    position: static;
    max-height: none;
    overflow: visible;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1.5rem;
    margin-bottom: 1.5rem;
  }
  
  .practice-screen__main {
    padding: 1.25rem;
    width: 100%;
  }
  
  .quiz-selectors {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
  }
  
  .quiz-selectors .form-group {
    width: 100%;
  }
  
  .quiz-selectors select,
  .quiz-selectors .input-field {
    width: 100%;
    font-size: 1rem;
  }
  
  .quiz-status {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .quiz-placeholder {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .quiz-placeholder__content {
    text-align: center;
    padding: 2rem 1rem;
  }
  
  .quiz-placeholder__icon {
    font-size: 3rem;
    margin-top: 1rem;
  }
  
  /* Modal fixes */
  .modal-overlay {
    padding: 0;
    align-items: flex-end;
  }
  
  .modal {
    padding: 0.5rem;
  }
  
  .modal__content {
    max-width: 100%;
    max-height: 90vh;
    margin: 0;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
  
  .auth-modal,
  .course-modal {
    width: 100vw !important;
    max-width: 100% !important;
    max-height: 92vh !important;
    margin: 0 !important;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
  }
  
  .course-modal__header {
    padding: 1.25rem 1rem !important;
    gap: 1rem !important;
  }
  
  .course-modal__badges {
    gap: 0.5rem;
  }
  
  .course-modal__title {
    font-size: 1.25rem !important;
    line-height: 1.3 !important;
  }
  
  .course-modal__instructor {
    font-size: 0.875rem !important;
  }
  
  .course-modal__close {
    width: 36px !important;
    height: 36px !important;
    font-size: 1.25rem !important;
  }
  
  .course-modal__body {
    padding: 1.25rem 1rem !important;
    gap: 1.5rem !important;
  }
  
  .course-modal__meta {
    grid-template-columns: 1fr !important;
    gap: 0.75rem !important;
  }
  
  .course-modal__meta-item {
    padding: 0.875rem 1rem !important;
  }
  
  .course-modal__meta-icon {
    width: 14px !important;
    height: 14px !important;
  }
  
  .course-modal__meta-label {
    font-size: 0.75rem !important;
  }
  
  .course-modal__meta-value {
    font-size: 1rem !important;
  }
  
  .course-modal__section-title {
    font-size: 1rem !important;
    margin-bottom: 0.75rem !important;
  }
  
  .course-modal__descriptor {
    font-size: 0.875rem !important;
    line-height: 1.5 !important;
  }
  
  .course-modal__syllabus {
    max-height: 300px !important;
    gap: 0.625rem !important;
  }
  
  .syllabus-item {
    padding: 0.875rem 1rem !important;
    flex-wrap: wrap;
  }
  
  .syllabus-item__left {
    gap: 0.75rem !important;
    flex: 1 !important;
    min-width: 0 !important;
  }
  
  .syllabus-item__index {
    width: 36px !important;
    height: 36px !important;
    font-size: 0.875rem !important;
  }
  
  .syllabus-item__title {
    font-size: 0.875rem !important;
  }
  
  .syllabus-item__subtitle {
    font-size: 0.75rem !important;
  }
  
  .syllabus-item__note {
    display: none;
  }
  
  .syllabus-item__chevron {
    font-size: 1.25rem !important;
  }
  
  .course-modal__footer {
    padding: 1rem !important;
    gap: 0.75rem !important;
    flex-direction: column !important;
  }
  
  .course-modal__footer .button {
    width: 100% !important;
    flex: none !important;
    min-width: 0 !important;
    justify-content: center;
  }
  
  .auth-modal__tabs {
    gap: 0.5rem;
    padding: 0 0.5rem;
  }
  
  .auth-modal__tab {
    font-size: 0.9375rem;
    padding: 0.75rem 1rem;
    flex: 1;
    text-align: center;
  }
  
  .course-modal__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .course-modal__body {
    padding: 1.25rem;
  }
  
  .course-modal__footer {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.25rem;
  }
  
  .course-modal__footer .button {
    width: 100%;
  }
  
  /* Form inputs */
  .form-input,
  .form-select,
  .form-textarea {
    font-size: 16px; /* Prevents iOS zoom on focus */
  }
  
  /* Buttons */
  .button--pill {
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
  }
  
  /* Page headers */
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-top: 0;
  }
  
  .page-header > div {
    width: 100%;
  }
  
  .page-header__eyebrow {
    font-size: 0.75rem;
    padding: 0.3rem 0.65rem;
  }
  
  .page-header h1,
  .page-header h2 {
    font-size: 1.5rem;
    line-height: 1.25;
    margin: 0.5rem 0;
  }
  
  .page-header p {
    font-size: 0.875rem;
    line-height: 1.5;
    margin-top: 0.25rem;
  }
  
  .page-header__actions {
    width: 100%;
    flex-direction: column;
    gap: 1rem;
    margin-top: 0.5rem;
  }
  
  .page-header__actions .button {
    width: 100%;
    justify-content: center;
    font-size: 0.9375rem;
  }
  
  .filter-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-gap: 0.5rem;
    gap: 0.5rem;
    width: 100%;
  }
  
  .filter-pill {
    padding: 0.625rem 0.5rem;
    font-size: 0.8125rem;
    text-align: center;
    white-space: nowrap;
    border: 1.5px solid rgba(10, 102, 194, 0.2);
  }
  
  .filter-pill--active {
    border-color: var(--primary);
    font-weight: 600;
  }
  
  /* Course detail */
  .course-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
  }
  
  .course-detail__layout {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 0 !important;
  }
  
  .course-detail__column {
    width: 100%;
    max-width: 100%;
    order: 1;
  }
  
  .course-detail__sidebar {
    width: 100%;
    order: 2;
    position: static !important;
    max-height: none;
    top: auto !important;
    right: auto !important;
  }
  
  .lesson-sidebar,
  .sidebar {
    position: static !important;
    width: 100%;
    height: auto;
    max-height: none;
    border-radius: var(--radius-md);
    padding: 1rem;
  }
  
  .lesson-sidebar__heading {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
  }
  
  .lesson-sidebar__description {
    font-size: 0.875rem;
    margin-bottom: 1rem;
  }
  
  .lesson-sidebar__close {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: none;
    background: rgba(10, 102, 194, 0.1);
    color: var(--primary-600);
    font-size: 1.125rem;
    font-weight: 400;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    line-height: 1;
  }
  
  .lesson-sidebar__close:active {
    background: rgba(10, 102, 194, 0.2);
    transform: scale(0.95);
  }
  
  /* Empty state styling */
  .lesson-list__empty {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-500);
    font-size: 0.875rem;
    line-height: 1.5;
  }
  
  .lesson-card {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: var(--radius-md);
  }
  
  .lesson-card__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
  }
  
  .lesson-card__header-content {
    width: 100%;
  }
  
  .lesson-card__title {
    font-size: 1.25rem;
    line-height: 1.3;
    margin: 0;
  }
  
  /* Hide progress badges on mobile for cleaner header */
  .lesson-card__progress-badges--desktop {
    display: none !important;
  }
  
  /* Show sidebar toggle button only on mobile */
  .lesson-card__sidebar-toggle {
    width: 100%;
    justify-content: center;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1.5px solid rgba(10, 102, 194, 0.3);
    margin-top: 0.5rem;
  }
  
  .lesson-card__media {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin: 0 0 1rem 0;
    background: #000;
  }
  
  .lesson-card__media iframe,
  .lesson-card__media > div {
    position: absolute;
    top: 0;
    left: 0;
    width: 100% !important;
    height: 100% !important;
    border: none;
  }
  
  .lesson-card__media--quiz {
    position: static;
    padding-bottom: 0;
    min-height: 350px;
    background: transparent;
  }
  
  .lesson-card__quizwrap {
    width: 100%;
  }
  
  .lesson-card__description {
    font-size: 0.9375rem;
    line-height: 1.6;
    margin: 0 0 1rem 0;
  }
  
  .lesson-card__nav {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.25rem;
    padding: 1rem;
    background: white;
    border-radius: 16px;
    border: 2px solid #e2e8f0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  }
  
  .lesson-card__nav-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
  }
  
  /* Navigation buttons (Prev/Next) - Top section */
  .lesson-card__nav-group--navigation {
    order: 1;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #f1f5f9;
  }
  
  .lesson-card__nav-group--navigation .button {
    flex: 1;
    min-width: 0;
    justify-content: center;
    font-size: 0.9375rem;
    font-weight: 700;
    padding: 0.875rem 1rem;
    min-height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(10, 102, 194, 0.08) 0%, rgba(10, 102, 194, 0.04) 100%);
    border: 1.5px solid rgba(10, 102, 194, 0.2);
    color: var(--primary-600);
    transition: all 0.2s ease;
  }
  
  .lesson-card__nav-group--navigation .button:active:not(:disabled) {
    background: var(--primary-600);
    color: white;
    transform: scale(0.98);
  }
  
  .lesson-card__nav-group--navigation .button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background: #f8fafc;
    border-color: #e2e8f0;
    color: #94a3b8;
  }
  
  /* Action buttons - Bottom section */
  .lesson-card__nav-group--actions {
    order: 2;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
    padding-top: 0.75rem;
  }
  
  .lesson-card__nav-group--actions .button {
    width: 100%;
    justify-content: center;
    font-size: 0.9375rem;
    font-weight: 700;
    padding: 0.875rem 1rem;
    min-height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    transition: all 0.2s ease;
  }
  
  .lesson-card__nav-group--actions .button-icon {
    font-size: 1.25rem;
    line-height: 1;
  }
  
  .lesson-card__nav-group--actions .button-text {
    font-size: 0.9375rem;
    font-weight: 700;
  }
  
  .lesson-card__nav-group--actions .button--success {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    color: white;
    border: none;
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.2);
  }
  
  .lesson-card__nav-group--actions .button--success:disabled {
    opacity: 0.7;
    background: #94a3b8;
    box-shadow: none;
  }
  
  .lesson-card__nav-group--actions .button--primary {
    box-shadow: 0 2px 8px rgba(10, 102, 194, 0.25);
  }
  
  .lesson-card__nav-group--actions .button--primary:active {
    transform: scale(0.98);
    box-shadow: 0 1px 4px rgba(10, 102, 194, 0.3);
  }
  
  .lesson-card__nav-group--actions .button--ghost {
    background: white;
    border: 1.5px solid #e2e8f0;
    color: #334155;
  }
  
  .lesson-card__nav-group--actions .button--ghost:active {
    background: #f8fafc;
    transform: scale(0.98);
  }
  
  /* Show only icons on very small screens */
  @media (max-width: 360px) {
    .lesson-card__nav-group--actions .button-text {
      display: none;
    }
    
    .lesson-card__nav-group--actions .button-icon {
      font-size: 1.5rem;
    }
    
    .lesson-card__nav-group--actions .button {
      min-height: 52px;
    }
  }
  
  .lesson-card__actions {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .lesson-card__actions .button {
    width: 100%;
    justify-content: center;
  }
  
  /* Collapsible Comments Section */
  .lesson-card--comments {
    padding: 0;
    margin-bottom: 1rem;
    overflow: hidden;
  }
  
  .lesson-card__comments-toggle {
    width: 100%;
    padding: 1rem;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: background 0.2s ease;
    font-family: inherit;
  }
  
  .lesson-card__comments-toggle:active {
    background: rgba(10, 102, 194, 0.05);
  }
  
  .lesson-card__comments-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-800);
  }
  
  .lesson-card__comments-chevron {
    font-size: 0.75rem;
    color: var(--text-500);
  }
  
  .lesson-card__comments-content {
    padding: 0 1rem 1rem;
    animation: slideDown 0.3s ease;
  }
  
  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  /* Mobile Sidebar Styles - Minimal and Seamless */
  .lesson-sidebar {
    position: fixed !important;
    top: 0;
    left: -100%;
    width: 100vw !important;
    max-width: 100vw !important;
    height: 100vh !important;
    max-height: 100vh !important;
    z-index: 1000;
    background: #ffffff;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0 !important;
    -webkit-overflow-scrolling: touch;
  }
  
  .lesson-sidebar--visible {
    left: 0 !important;
  }
  
  /* Sidebar overlay backdrop */
  .lesson-sidebar--visible::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: -1;
    animation: fadeIn 0.3s ease;
  }
  
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  
  .lesson-sidebar__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1rem 0.875rem;
    padding-top: calc(1rem + 60px); /* Account for navbar height */
    border-bottom: 1px solid #e5e7eb;
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    background: white;
    z-index: 10;
  }
  
  .lesson-sidebar__header > div {
    flex: 1;
    min-width: 0;
  }
  
  .lesson-sidebar__heading {
    font-size: 1.125rem !important;
    margin: 0 !important;
    font-weight: 700;
    line-height: 1.4;
    color: #111827;
  }
  
  .lesson-sidebar__description {
    display: none !important;
  }
  
  .lesson-sidebar__close {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid #d1d5db;
    background: white;
    color: #6b7280;
    font-size: 1.25rem;
    font-weight: 400;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    line-height: 1;
  }
  
  .lesson-sidebar__close:active {
    background: #f9fafb;
    border-color: #9ca3af;
  }
  
  .lesson-list {
    padding: 0;
    margin: 0;
    background: white;
  }
  
  .lesson-list__group {
    margin-bottom: 0;
    background: white;
    border-bottom: 1px solid #f3f4f6;
  }
  
  /* Chapter/Module - Simple List Item */
  .lesson-list__item {
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    width: 100%;
    border: none;
    background: white;
    text-align: left;
    cursor: pointer;
    transition: background 0.15s ease;
    min-height: 52px;
  }
  
  .lesson-list__item:active {
    background: #f9fafb;
  }
  
  .lesson-list__item--active {
    background: #eff6ff;
  }
  
  .lesson-list__index {
    font-size: 0.875rem;
    font-weight: 600;
    min-width: 32px;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: #f3f4f6;
    color: #6b7280;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 0.125rem;
  }
  
  .lesson-list__item--active .lesson-list__index {
    background: var(--primary-600);
    color: white;
  }
  
  .lesson-list__item--completed .lesson-list__index {
    background: #d1fae5;
    color: #059669;
  }
  
  .lesson-list__meta {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    min-width: 0;
    overflow: hidden;
  }
  
  .lesson-list__title {
    font-size: 0.9375rem;
    line-height: 1.4;
    font-weight: 600;
    color: #111827;
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: normal;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
  }
  
  .lesson-list__item--active .lesson-list__title {
    color: var(--primary-600);
    font-weight: 700;
  }
  
  .lesson-list__duration {
    display: none;
  }
  
  .lesson-list__chevron {
    font-size: 1rem;
    color: #9ca3af;
    flex-shrink: 0;
    transition: transform 0.2s ease;
    margin-top: 0.375rem;
  }
  
  .is-expanded .lesson-list__chevron {
    transform: rotate(90deg);
  }
  
  /* Subchapter/Lesson - Nested Items */
  .lesson-list__children {
    padding: 0;
    margin: 0;
    background: #fafafa;
    animation: expandChildren 0.2s ease-out;
    overflow: hidden;
  }
  
  @keyframes expandChildren {
    from {
      opacity: 0;
      max-height: 0;
    }
    to {
      opacity: 1;
      max-height: 2000px;
    }
  }
  
  .lesson-list__children .lesson-list__item {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    min-height: 48px;
    background: transparent;
    border-bottom: 1px solid #f3f4f6;
    align-items: flex-start;
  }
  
  .lesson-list__children .lesson-list__item:last-child {
    border-bottom: none;
  }
  
  .lesson-list__children .lesson-list__item:active {
    background: #f5f5f5;
  }
  
  .lesson-list__children .lesson-list__item--active {
    background: #eff6ff;
  }
  
  .lesson-list__children .lesson-list__index {
    width: 28px;
    height: 28px;
    font-size: 0.8125rem;
    margin-top: 0.125rem;
  }
  
  .lesson-list__children .lesson-list__meta {
    overflow: hidden;
  }
  
  .lesson-list__children .lesson-list__title {
    font-size: 0.8125rem;
    font-weight: 500;
    line-height: 1.35;
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: normal;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
  }
  
  .lesson-list__children .lesson-list__duration {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  /* Hide chip completely on mobile for cleaner look */
  .lesson-list__item .chip {
    display: none;
  }
  
  /* Empty state styling */
  .lesson-list__empty {
    padding: 3rem 1.5rem;
    text-align: center;
    color: #6b7280;
    font-size: 0.875rem;
    line-height: 1.6;
  }
  
  /* Dashboard */
  .dashboard-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .grid--metrics {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .metric-card {
    padding: 1.25rem;
    text-align: center;
  }
  
  .metric-card__value {
    font-size: 2rem;
  }
  
  .metric-card__caption {
    font-size: 0.875rem;
    margin-top: 0.5rem;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  
  .stat-card {
    padding: 1rem;
  }
  
  .stat-card__value {
    font-size: 1.75rem;
  }
  
  .stat-card__label {
    font-size: 0.8125rem;
  }
  
  .dashboard-section {
    width: 100%;
  }
  
  .dashboard-section__header {
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
  }
  
  .dashboard-section__header .button {
    width: 100%;
  }
  
  .progress-dashboard {
    padding: 1.25rem;
  }
  
  .progress-dashboard__section {
    margin-bottom: 1.5rem;
  }
  
  .progress-dashboard__section h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
  }
  
  .badge-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  
  .badge-item {
    padding: 0.875rem;
    text-align: center;
  }
  
  .badge-item__icon {
    font-size: 1.5rem;
  }
  
  .badge-item__name {
    font-size: 0.8125rem;
  }
  
  .course-progress-list {
    gap: 0.75rem;
  }
  
  .course-progress-item {
    padding: 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  
  .course-progress-item__stats {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  /* Flashcards */
  .flashcard-deck {
    padding: 1rem;
  }
  
  .flashcard-deck__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }
  
  .flashcard-deck__header h3 {
    font-size: 1.25rem;
  }
  
  .flashcard-deck__actions {
    width: 100%;
    display: flex;
    gap: 0.5rem;
  }
  
  .flashcard-deck__actions .button {
    flex: 1;
  }
  
  .flashcard {
    min-height: 320px;
  }
  
  .flashcard__content {
    font-size: 1rem;
    line-height: 1.6;
  }
  
  .flashcard-controls {
    flex-direction: column;
    gap: 1rem;
  }
  
  .flashcard-controls__rating {
    width: 100%;
    display: flex;
    gap: 0.75rem;
  }
  
  .flashcard-controls__rating .button {
    flex: 1;
  }
  
  .flashcard-deck__actions {
    width: 100%;
    justify-content: space-between;
  }
  
  .flashcard {
    min-height: 300px;
    height: auto;
    max-height: 400px;
  }
  
  .flashcard__content {
    font-size: 1.125rem;
    padding: 1rem;
    line-height: 1.6;
  }
  
  .flashcard__hint,
  .flashcard__explanation {
    font-size: 0.875rem;
    padding: 0.75rem;
  }
  
  .flashcard-controls {
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
  }
  
  .flashcard-controls > .button {
    flex: 1;
    min-width: 100px;
  }
  
  .flashcard-controls__rating {
    width: 100%;
    order: -1;
    justify-content: center;
    gap: 0.75rem;
  }
  
  .flashcard-controls__rating .button {
    flex: 1;
  }
  
  /* Notification Center */
  .notification-center {
    padding: 1rem;
  }
  
  .notification-center__tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
  }
  
  .notification-center__tab {
    white-space: nowrap;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
  }
  
  .notification-item,
  .reminder-item {
    padding: 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  
  .notification-item__content,
  .reminder-item__content {
    width: 100%;
  }
  
  .notification-item__actions,
  .reminder-item__actions {
    width: 100%;
    justify-content: flex-end;
  }
  
  /* Tables */
  .table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 -1rem;
    padding: 0 1rem;
  }
  
  .table {
    min-width: 600px;
  }
  
  .table th,
  .table td {
    padding: 0.75rem;
    font-size: 0.875rem;
  }
  
  /* Footer */
  .footer {
    padding: 2rem 0 1.5rem;
  }
  
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer__section h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.75rem;
  }
  
  .footer__links {
    gap: 0.5rem;
  }
  
  .footer__link {
    font-size: 0.875rem;
  }
  
  .footer__bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
    padding-top: 1.5rem;
  }
  
  .footer__social {
    justify-content: center;
  }
  
  .course-header {
    padding: 1.5rem 0;
  }
  
  .course-header__title {
    font-size: 1.75rem;
  }
  
  .course-header__meta {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .course-header__actions {
    width: 100%;
    margin-top: 1rem;
  }
  
  .course-header__actions .button {
    width: 100%;
    justify-content: center;
  }
  
  /* Video player container */
  .video-container {
    aspect-ratio: 16/9;
    width: 100%;
  }
  
  /* Comments section */
  .comments-section {
    padding: 1rem;
  }
  
  /* Dashboard stats */
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .metric-card {
    padding: 1.25rem;
  }
  
  .metric-card h3 {
    font-size: 1.875rem;
  }
  
  /* Progress bars */
  .progress-list {
    gap: 1rem;
  }
  
  /* Admin page table */
  .table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 -1rem;
    padding: 0 1rem;
  }
  
  table {
    min-width: 800px;
    font-size: 0.875rem;
  }
  
  table th,
  table td {
    padding: 0.75rem 0.5rem;
  }
  
  /* Dropdown menu positioning */
  .dropdown__menu {
    right: 0;
    left: auto;
    min-width: 200px;
    max-width: 280px;
  }
  
  .dropdown__item {
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
  }
  
  /* Badge sizing */
  .badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.625rem;
  }
  
  /* Chips */
  .chip {
    font-size: 0.8125rem;
    padding: 0.4375rem 0.875rem;
  }
  
  /* Sections */
  .section {
    padding: 2rem 0;
  }
  
  /* Video player container */
  .video-container {
    aspect-ratio: 16/9;
    width: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
  }
  
  .video-container iframe {
    width: 100%;
    height: 100%;
  }
  
  /* Comments section */
  .comments-section {
    padding: 1.25rem;
  }
  
  /* Course modules accordion */
  .module {
    margin-bottom: 0.75rem;
  }
  
  .module__header {
    padding: 1rem;
  }
  
  .module__title {
    font-size: 1rem;
  }
  
  .lesson {
    padding: 1rem;
  }
  
  .lesson__title {
    font-size: 0.9375rem;
  }
  
  /* Form improvements */
  .form-group {
    margin-bottom: 1.25rem;
  }
  
  .form-label {
    font-size: 0.9375rem;
    margin-bottom: 0.5rem;
  }
  
  .form-input,
  .form-select,
  .form-textarea,
  .input-field {
    font-size: 1rem; /* Prevents iOS zoom on focus */
    padding: 0.75rem 1rem;
  }
  
  .form-message {
    font-size: 0.875rem;
  }
}

/* Tablet landscape (768px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
  
  .grid--courses {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid--metrics {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .course-detail__layout {
    grid-template-columns: 1fr;
  }
  
  .course-detail__column {
    max-width: 100%;
  }
  
  .course-detail__sidebar {
    position: static;
    width: 100%;
    max-width: 100%;
  }
  
  .filter-group {
    flex-wrap: nowrap;
  }
}

/* Touch device improvements */
@media (hover: none) and (pointer: coarse) {
  .button,
  .filter-pill,
  .lesson-list__item,
  .module__header {
    min-height: 44px;
    display: flex;
    align-items: center;
  }
  
  /* Larger tap targets */
  a, button, input, select, textarea {
    min-height: 44px;
  }
}

/* Small phones (< 375px) */
@media (max-width: 374px) {
  .container {
    padding-left: 0.875rem;
    padding-right: 0.875rem;
  }
  
  .hero__title {
    font-size: 1.625rem;
  }
  
  .hero__description {
    font-size: 0.9375rem;
  }
  
  .nav-actions .button {
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
  }
  
  .filter-pill {
    font-size: 0.8125rem;
    padding: 0.5rem 0.75rem;
  }
  
  .metric-card__value {
    font-size: 1.75rem;
  }
  
  .card,
  .course-card {
    padding: 1rem;
  }
  
  .page-header h1,
  .page-header h2 {
    font-size: 1.5rem;
  }
}

/* Medium phones and phablets (375px - 480px) */
@media (min-width: 375px) and (max-width: 480px) {
  .hero-card__metric {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Tablets portrait (481px - 768px) */
@media (min-width: 481px) and (max-width: 768px) {
  .grid--courses {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  }
  
  .hero-card__metric {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .quiz-selectors {
    flex-direction: row;
    flex-wrap: wrap;
  }
  
  .quiz-selectors .form-group {
    flex: 1 1 45%;
    min-width: 200px;
  }
}

/* Landscape orientation on mobile */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding: 1.5rem 0;
  }
  
  .hero--full {
    min-height: auto;
    padding: 1.5rem 0;
  }
  
  .modal-overlay {
    align-items: flex-start;
    padding: 0.5rem;
  }
  
  .modal,
  .auth-modal,
  .course-modal {
    max-height: 95vh;
  }
  
  .modal__content {
    max-height: 95vh;
  }
  
  .navbar {
    position: -webkit-sticky;
    position: sticky;
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  /* Increase touch targets */
  .button,
  .nav-link,
  .course-card__cta,
  .dropdown__item,
  .lesson,
  .module__header {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
  
  /* Better tap feedback */
  .button,
  .card,
  .course-card,
  .chip,
  .badge {
    -webkit-tap-highlight-color: rgba(10, 102, 194, 0.1);
  }
  
  /* Improve scroll performance */
  .modal-overlay,
  .practice-screen__aside,
  .table-wrapper {
    -webkit-overflow-scrolling: touch;
  }
  
  /* Prevent text selection on interactive elements */
  .button,
  .nav-link,
  .dropdown__item {
    -webkit-user-select: none;
    user-select: none;
  }
}

  
  /* Admin edit modal */
  .modal__content {
    max-width: 100% !important;
    width: 100vw !important;
    max-height: 95vh !important;
    margin: 0 !important;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
  }
  
  .modal__header {
    padding: 1rem !important;
  }
  
  .modal__title {
    font-size: 1.125rem !important;
  }
  
  .modal__body {
    padding: 1rem !important;
  }
  
  .modal__body > div {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }
  
  .modal__footer {
    padding: 1rem !important;
    flex-direction: column-reverse !important;
  }
  
  .modal__footer .button {
    width: 100%;
    justify-content: center;
  }
  
  .form-field {
    grid-column: 1 / -1 !important;
  }
  
  .form-input,
  .form-field textarea {
    font-size: 16px !important; /* Prevents iOS zoom */
  }

/* Dark mode adjustments for mobile */
@media (max-width: 768px) and (prefers-color-scheme: dark) {
  .navbar {
    background: rgba(15, 23, 42, 0.95);
    -webkit-backdrop-filter: blur(8px);
            backdrop-filter: blur(8px);
  }
  
  .modal,
  .modal__content {
    background: var(--surface);
  }
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}