:root {
    --bg: #0f1729;
    --bg-soft: #121d32;
    --bg-muted: #1a2438;
    --bg-alt: #080c16;
    --primary: #4f46e5;
    --primary-soft: rgba(79, 70, 229, 0.12);
    --accent: #22d3ee;
    --danger: #f87171;
    --success: #4ade80;
    --text: #f8fafc;
    --text-muted: #cbd5f5;
    --border: rgba(148, 163, 184, 0.2);
    --border-strong: rgba(79, 70, 229, 0.2);
    --border-soft: rgba(148, 163, 184, 0.2);
    --surface-neutral: rgba(18, 29, 50, 0.75);
    --surface-overlay: rgba(16, 24, 41, 0.65);
    --surface-header: rgba(15, 23, 41, 0.85);
    --surface-panel: rgba(12, 19, 32, 0.92);
    --surface-highlight: rgba(18, 26, 42, 0.9);
    --surface-card: rgba(22, 30, 46, 0.95);
    --surface-popover: rgba(8, 13, 23, 0.92);
    --surface-muted: rgba(12, 19, 32, 0.6);
    --surface-hero: rgba(26, 36, 56, 0.85);
    --surface-admin: rgba(10, 16, 28, 0.85);
    --surface-admin-soft: rgba(10, 16, 28, 0.75);
    --surface-admin-preview: rgba(7, 12, 22, 0.85);
    --surface-admin-track: rgba(12, 19, 32, 0.6);
    --tag-live-bg: rgba(74, 222, 128, 0.2);
    --tag-live-border: rgba(74, 222, 128, 0.35);
    --accent-soft: rgba(34, 211, 238, 0.12);
    --accent-soft-strong: rgba(34, 211, 238, 0.22);
    --accent-border: rgba(34, 211, 238, 0.4);
    --primary-outline: rgba(79, 70, 229, 0.25);
    --primary-border-soft: rgba(79, 70, 229, 0.35);
    --primary-border-strong: rgba(79, 70, 229, 0.4);
    --primary-border-focus: rgba(79, 70, 229, 0.6);
    --primary-border-emphasis: rgba(79, 70, 229, 0.45);
    --shadow-hero: 0 20px 45px rgba(13, 16, 35, 0.45);
    --shadow-card: 0 24px 48px rgba(8, 12, 24, 0.35);
    --shadow-admin: 0 32px 48px rgba(11, 17, 32, 0.36);
    --shadow-soft: 0 12px 30px rgba(10, 14, 28, 0.35);
    --shadow-elevated: 0 16px 30px rgba(8, 12, 24, 0.45);
    --border-popover: rgba(148, 163, 184, 0.25);
    --btn-secondary-bg: rgba(79, 70, 229, 0.08);
    --btn-secondary-bg-hover: rgba(79, 70, 229, 0.16);
    --btn-ghost-hover: rgba(79, 70, 229, 0.08);
    --btn-danger-bg: rgba(248, 113, 113, 0.12);
    --btn-danger-bg-hover: rgba(248, 113, 113, 0.2);
    --scrollbar-thumb: rgba(79, 70, 229, 0.5);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --transition: all 0.25s ease-in-out;
    --transition-fast: all 0.18s ease-in-out;
    --transition-slow: all 0.45s ease-in-out;
    font-size: 16px;
}

:root[data-theme="light"] {
    --bg: #f4f7ff;
    --bg-soft: #f0f4ff;
    --bg-muted: #eef3ff;
    --bg-alt: #ffffff;
    --primary: #4338ca;
    --primary-soft: rgba(67, 56, 202, 0.15);
    --accent: #0ea5e9;
    --danger: #dc2626;
    --success: #16a34a;
    --text: #0f172a;
    --text-muted: #475569;
    --border: rgba(148, 163, 184, 0.35);
    --border-strong: rgba(67, 56, 202, 0.25);
    --border-soft: rgba(148, 163, 184, 0.25);
    --surface-neutral: rgba(255, 255, 255, 0.9);
    --surface-overlay: rgba(255, 255, 255, 0.92);
    --surface-header: rgba(255, 255, 255, 0.9);
    --surface-panel: rgba(255, 255, 255, 0.95);
    --surface-highlight: rgba(241, 245, 255, 0.95);
    --surface-card: rgba(255, 255, 255, 0.98);
    --surface-popover: rgba(255, 255, 255, 0.98);
    --surface-muted: rgba(226, 232, 240, 0.55);
    --surface-hero: rgba(236, 239, 255, 0.95);
    --surface-admin: rgba(255, 255, 255, 0.95);
    --surface-admin-soft: rgba(245, 248, 255, 0.95);
    --surface-admin-preview: rgba(240, 246, 255, 0.95);
    --surface-admin-track: rgba(226, 232, 240, 0.6);
    --tag-live-bg: rgba(34, 197, 94, 0.18);
    --tag-live-border: rgba(34, 197, 94, 0.35);
    --accent-soft: rgba(14, 165, 233, 0.12);
    --accent-soft-strong: rgba(14, 165, 233, 0.2);
    --accent-border: rgba(14, 165, 233, 0.35);
    --primary-outline: rgba(67, 56, 202, 0.25);
    --primary-border-soft: rgba(67, 56, 202, 0.25);
    --primary-border-strong: rgba(67, 56, 202, 0.33);
    --primary-border-focus: rgba(67, 56, 202, 0.45);
    --primary-border-emphasis: rgba(14, 165, 233, 0.35);
    --shadow-hero: 0 20px 40px rgba(15, 23, 42, 0.12);
    --shadow-card: 0 16px 32px rgba(15, 23, 42, 0.14);
    --shadow-admin: 0 24px 32px rgba(15, 23, 42, 0.12);
    --shadow-soft: 0 12px 24px rgba(15, 23, 42, 0.12);
    --shadow-elevated: 0 14px 30px rgba(15, 23, 42, 0.14);
    --border-popover: rgba(148, 163, 184, 0.35);
    --btn-secondary-bg: rgba(67, 56, 202, 0.12);
    --btn-secondary-bg-hover: rgba(67, 56, 202, 0.18);
    --btn-ghost-hover: rgba(148, 163, 184, 0.2);
    --btn-danger-bg: rgba(239, 68, 68, 0.14);
    --btn-danger-bg-hover: rgba(239, 68, 68, 0.2);
    --scrollbar-thumb: rgba(148, 163, 184, 0.55);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 24px, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translate3d(0, -24px, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes floatPulse {
    0%,
    100% {
        transform: translate3d(0, 0, 0);
    }
    50% {
        transform: translate3d(0, -12px, 0);
    }
}

@keyframes glowPulse {
    0%,
    100% {
        transform: scale(1);
        opacity: 0.75;
    }
    50% {
        transform: scale(1.05);
        opacity: 1;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}
    .resource-tags {
        display: flex;
        gap: 0.5rem;
        flex-wrap: wrap;
    }

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Cairo", sans-serif;
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-alt) 100%);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.25s ease, opacity 0.25s ease;
}

a:hover {
    color: var(--accent);
}

button,
input,
select,
textarea {
    transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.container {
    width: min(1100px, 92vw);
    margin-inline: auto;
    padding-inline: 0.5rem;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(12px);
    background: var(--surface-header);
    border-bottom: 1px solid var(--border);
    animation: fadeInDown 0.7s ease forwards;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-image {
    width: 64px;
    height: auto;
    flex-shrink: 0;
    filter: drop-shadow(0 8px 18px rgba(217, 163, 80, 0.35));
    transition: transform 0.4s ease, filter 0.4s ease;
}

.logo:hover .logo-image {
    transform: translateY(-4px) scale(1.03);
    filter: drop-shadow(0 12px 22px rgba(217, 163, 80, 0.5));
}

.logo-text h1 {
    margin: 0;
    font-size: 1.4rem;
}

.logo-text p {
    margin: 0.25rem 0 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.main-nav {
    position: relative;
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.main-nav ul {
    display: flex;
    gap: 1.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    border: 1px solid transparent;
    background: var(--primary-soft);
    color: var(--text);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
    border-color: var(--accent);
    color: var(--accent);
    outline: none;
}

.theme-toggle-icon {
    font-size: 1rem;
    line-height: 1;
}

.main-nav a {
    font-weight: 600;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.main-nav a:hover,
.main-nav a:focus {
    background: var(--primary-soft);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: transparent;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 3px;
    background: var(--text);
    border-radius: 999px;
}

.hero {
    position: relative;
    padding: 5rem 0 4rem;
    animation: fadeInUp 0.9s ease 0.1s both;
}

.hero .container {
    display: grid;
    gap: 4rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: center;
}

.hero-content h2 {
    font-size: clamp(2.2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.hero-content p {
    margin: 0 0 2rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

.hero-visual {
    position: relative;
    display: grid;
    justify-content: center;
}

.hero-visual .circle {
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: radial-gradient(circle at top, rgba(34, 211, 238, 0.35), rgba(79, 70, 229, 0.1) 70%, transparent 100%);
    filter: blur(0.7px);
    animation: glowPulse 7.5s ease-in-out infinite;
}

.hero-visual .card {
    position: absolute;
    backdrop-filter: blur(16px);
    background: var(--surface-hero);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1.75rem;
    font-weight: 600;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    box-shadow: var(--shadow-hero);
    animation: floatPulse 6.5s ease-in-out infinite;
}

.hero-visual .card-lecture {
    top: 12%;
    left: 12%;
    animation-delay: 0s;
}

.hero-visual .card-book {
    bottom: 16%;
    right: 10%;
    animation-delay: 1.1s;
}

.hero-visual .card-sheet {
    bottom: 4%;
    left: 18%;
    animation-delay: 2.2s;
}

.section {
    padding: 4rem 0;
    animation: fadeInUp 0.9s ease 0.15s both;
}

.section-muted {
    background: var(--bg-muted);
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h3 {
    font-size: 1.8rem;
    margin-bottom: 0.75rem;
}

.section-header p {
    color: var(--text-muted);
    margin: 0;
}

.overview-grid {
    display: grid;
    gap: 1.75rem;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.overview-item {
    background: var(--surface-neutral);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    transition: var(--transition);
}

.overview-item:hover {
    border-color: var(--primary-border-focus);
    transform: translateY(-6px);
}

.filters {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.filters input,
.filters select {
    flex: 1 1 220px;
    background: var(--surface-overlay);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    color: var(--text);
    font-family: inherit;
}

.filters input:focus,
.filters select:focus {
    outline: 1px solid var(--primary);
}

.stage-list {
    display: grid;
    gap: 2rem;
}

.stage-card {
    background: var(--surface-panel);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    display: grid;
    gap: 1.5rem;
    transition: var(--transition);
}

.stage-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.stage-card h4 {
    margin: 0;
    font-size: 1.4rem;
}

.stage-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.course-list {
    display: grid;
    gap: 1rem;
}

.course-card {
    background: var(--surface-highlight);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.course-card.is-open {
    border-color: var(--accent);
}

.course-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    background: transparent;
    border: none;
    color: inherit;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    cursor: pointer;
    text-align: right;
}

.course-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.course-toggle-text {
    display: grid;
    gap: 0.35rem;
}

.course-title {
    font-weight: 600;
    font-size: 1.1rem;
}

.course-description {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.course-toggle-icon {
    transition: transform 0.25s ease;
}

.course-card.is-open .course-toggle-icon {
    transform: rotate(-180deg);
}

.course-card .subject-list {
    padding: 0 1.25rem 1.25rem;
}

.subject-list {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.subject-card {
    background: var(--surface-card);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    cursor: pointer;
    outline: none;
}

.subject-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
}

.subject-card-header h5 {
    margin: 0;
}

.subject-card-meta {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.subject-card h5 {
    margin: 0;
    font-size: 1.1rem;
}

.subject-card:focus-visible {
    box-shadow: 0 0 0 2px var(--accent);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
}

.resource-list {
    display: grid;
    gap: 1rem;
}

.resource-card {
    display: grid;
    gap: 0.7rem;
    padding: 1rem;
    border-radius: var(--radius-sm);
    background: var(--surface-highlight);
    border: 1px solid var(--border-strong);
    transition: var(--transition);
}

.resource-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
}

.resource-card strong {
    font-size: 1.05rem;
}

.resource-card a {
    align-self: flex-start;
    font-size: 0.9rem;
    color: var(--accent);
}

.faq-list {
    display: grid;
    gap: 1rem;
    margin-top: 2rem;
}

.faq-list details {
    background: var(--surface-neutral);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    transition: var(--transition);
    animation: fadeInUp 0.9s ease 0.2s both;
}

.faq-list details:hover {
    border-color: var(--primary-border-emphasis);
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

.faq-list details[open] {
    border-color: var(--primary-border-emphasis);
    background: var(--surface-panel);
}

.faq-list summary {
    cursor: pointer;
    font-weight: 600;
    outline: none;
    transition: color 0.25s ease;
}

.faq-list details[open] summary {
    color: var(--accent);
}

.site-footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    background: var(--surface-panel);
    animation: fadeInUp 0.9s ease 0.2s both;
}

.site-footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.4rem;
    border-radius: 999px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(120deg, var(--primary) 0%, #4338ca 100%);
    color: #fff;
}

.btn-primary:hover {
    filter: brightness(1.1);
}

.btn-secondary {
    background: var(--btn-secondary-bg);
    color: var(--accent);
}

.btn-secondary:hover {
    background: var(--btn-secondary-bg-hover);
}

.btn-danger {
    background: var(--btn-danger-bg);
    color: var(--danger);
}

.btn-danger:hover {
    background: var(--btn-danger-bg-hover);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
}

.btn-ghost:hover {
    color: var(--accent);
    background: var(--btn-ghost-hover);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Admin styles */

.admin-body {
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-soft) 100%);
}

.admin-header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border);
}

.admin-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.admin-main {
    padding: 3rem 0 4rem;
}

.admin-section {
    margin-bottom: 3rem;
    background: var(--surface-admin);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    backdrop-filter: blur(10px);
}

.admin-grid .admin-section {
    margin-bottom: 0;
}

.admin-section h2 {
    margin-top: 0;
    margin-bottom: 1.5rem;
}

.admin-dashboard-header h2 {
    margin-bottom: 0.5rem;
}

.admin-form {
    display: grid;
    gap: 1.25rem;
}

.admin-section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
}

.admin-section-header h2 {
    margin-bottom: 0.35rem;
}

.admin-section-header p {
    margin: 0.35rem 0 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.admin-card {
    box-shadow: var(--shadow-admin);
    border: 1px solid var(--border-strong);
    transition: var(--transition);
}

.admin-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-border);
}

.admin-dashboard-intro {
    display: grid;
    gap: 1.75rem;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.3), rgba(34, 211, 238, 0.12));
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-admin);
}

.admin-dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.admin-dashboard-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: flex-start;
}

.admin-dashboard-time {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.admin-dashboard-time strong {
    color: #f8fafc;
    font-weight: 600;
}

.tag-live {
    background: var(--tag-live-bg);
    color: #4ade80;
    border: 1px solid var(--tag-live-border);
}

.admin-stats {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.admin-stat {
    padding: 1.25rem;
    border-radius: var(--radius-md);
    background: var(--surface-admin-soft);
    border: 1px solid var(--border-soft);
    display: grid;
    gap: 0.35rem;
    text-align: start;
}

.admin-stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: #38bdf8;
}

.admin-stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.admin-grid {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

.admin-grid:last-of-type {
    margin-bottom: 0;
}

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

.admin-grid--stretch {
    align-items: stretch;
}

.admin-grid--stretch .admin-card--wide {
    min-height: 100%;
}

.admin-preview-card {
    display: grid;
    gap: 1rem;
    min-height: 100%;
}

.admin-preview-card .admin-preview {
    max-height: 600px;
    overflow-y: auto;
    padding-inline-end: 0.25rem;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--surface-admin-track);
    background: var(--surface-admin-preview);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
}

.admin-preview-card .admin-preview::-webkit-scrollbar {
    width: 6px;
}

.admin-preview-card .admin-preview::-webkit-scrollbar-track {
    background: var(--surface-admin-track);
}

.admin-preview-card .admin-preview::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 999px;
}

.admin-auth {
    position: relative;
    overflow: hidden;
}

.admin-auth::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(34, 211, 238, 0.12), transparent 60%);
    pointer-events: none;
    border-radius: inherit;
}

.admin-auth-grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2.5rem;
    align-items: center;
}

.admin-auth-copy {
    display: grid;
    gap: 1rem;
    max-width: 420px;
}

.admin-auth-perks {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.75rem;
}

.admin-auth-perks li {
    display: flex;
    gap: 0.5rem;
    align-items: flex-start;
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.admin-auth-perks li::before {
    content: "✔";
    font-size: 0.9rem;
    color: var(--success);
    margin-inline-start: 0.25rem;
}

.admin-auth-form {
    background: var(--surface-admin);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-strong);
    padding: 2rem;
    box-shadow: var(--shadow-card);
    max-width: 420px;
    width: 100%;
}

.form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.form-status {
    min-height: 1.25rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-status[data-type="success"] {
    color: var(--success);
}

.form-status[data-type="error"] {
    color: var(--danger);
}

.is-hidden {
    display: none !important;
}

.form-group {
    display: grid;
    gap: 0.6rem;
}

.form-group label {
    font-weight: 600;
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface-admin-soft);
    color: var(--text);
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: 1px solid var(--accent);
}

.form-hint {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.file-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
}

.form-row {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

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

.admin-preview {
    display: grid;
    gap: 1rem;
}

.preview-stage {
    padding: 1.25rem;
    border-radius: var(--radius-md);
    background: var(--surface-admin);
    border: 1px solid var(--border-strong);
}

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

.preview-stage header h3 {
    margin: 0;
}

.preview-stage header p {
    margin: 0.35rem 0 0;
}

.preview-stage h3 {
    margin: 0 0 0.75rem;
}

.preview-courses {
    display: grid;
    gap: 0.9rem;
    margin-top: 0.9rem;
}

.preview-course {
    padding: 0.9rem;
    border-radius: var(--radius-sm);
        scrollbar-color: var(--scrollbar-thumb) var(--surface-admin-track);
    border: 1px solid var(--border);
}

.preview-course header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.6rem;
    margin-bottom: 0.55rem;
}

.preview-course header h3 {
    margin: 0;
    font-size: 1.05rem;
}

.preview-course header p {
    margin: 0;
}

.preview-subjects {
    display: grid;
    gap: 0.6rem;
}

.preview-subject {
    padding: 0.6rem;
    margin-top: 0.4rem;
    border-radius: var(--radius-sm);
    background: var(--surface-admin-preview);
    border: 1px solid var(--border-soft);
}

.preview-subject h4 {
    margin: 0 0 0.35rem;
}

.preview-subject header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.6rem;
}

.preview-subject header h4 {
    margin: 0;
}

.preview-subject header p {
    margin: 0.25rem 0 0;
}

.preview-resource {
    padding: 0.25rem 0;
    border-bottom: 1px solid var(--border);
}

.preview-resource:last-child {
    border-bottom: none;
}

.preview-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin: 0.3rem 0;
}

.preview-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.preview-resource-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
}

.preview-resource-header strong {
    flex: 1;
}

.preview-resource p {
    margin: 0.25rem 0 0;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.45rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    border: 1px solid transparent;
}

.btn-icon svg {
    width: 14px;
    height: 14px;
}

.preview-resources {
    display: grid;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--accent-soft-strong);
    color: var(--accent);
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
}

/* Subject detail page */

.subject-page {
    padding: 6rem 0 4rem;
    animation: fadeInUp 0.9s ease 0.1s both;
}

.breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.breadcrumb:hover {
    color: var(--accent);
}

.subject-hero {
    display: grid;
    gap: 1rem;
    margin: 2rem 0 3rem;
    padding: 2rem;
    border-radius: var(--radius-lg);
    background: var(--surface-panel);
    border: 1px solid var(--border);
    animation: fadeInUp 0.9s ease 0.2s both;
}

.subject-hero h2 {
    margin: 0;
    font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.subject-hero p {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.7;
}

.subject-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.resource-search {
    display: grid;
    gap: 0.5rem;
    max-width: min(480px, 100%);
    margin-bottom: 2rem;
}

.resource-search label {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.resource-search input,
.resource-search select {
    background: var(--surface-overlay);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.85rem 1rem;
    color: var(--text);
    font-family: inherit;
    transition: var(--transition);
}

.resource-search input:focus,
.resource-search select:focus {
    border-color: var(--accent);
    outline: 1px solid var(--primary-outline);
}

.resource-search input:disabled,
.resource-search select:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.resource-search select {
    appearance: none;
    background-image: linear-gradient(45deg, transparent 50%, var(--accent) 50%),
        linear-gradient(135deg, var(--accent) 50%, transparent 50%);
    background-position: calc(100% - 18px) calc(1.05rem), calc(100% - 13px) calc(1.05rem);
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    padding-inline-end: 2.5rem;
}

.resource-accordion {
    display: grid;
    gap: 1.25rem;
}

.resource-item {
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--surface-neutral);
    overflow: hidden;
    transition: var(--transition);
    animation: fadeInUp 0.75s ease 0.2s both;
}

.resource-item.is-open {
    border-color: var(--primary-border-strong);
    box-shadow: var(--shadow-soft);
}

.resource-item:hover {
    transform: translateY(-4px);
    border-color: var(--primary-border-soft);
    box-shadow: var(--shadow-elevated);
}

.resource-toggle {
    width: 100%;
    padding: 1.2rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    background: transparent;
    border: none;
    color: inherit;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.resource-toggle:hover,
.resource-toggle:focus-visible {
    background: var(--primary-soft);
    outline: none;
    transform: translateY(-1px);
}

.resource-toggle-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.resource-toggle .chevron {
    font-size: 0.85rem;
    transition: var(--transition);
}

.resource-item.is-open .resource-toggle .chevron {
    transform: rotate(180deg);
}

.resource-panel {
    padding: 1rem 1.5rem 1.5rem;
    display: grid;
    gap: 0.85rem;
    background: var(--surface-admin-preview);
    border-top: 1px solid var(--border-strong);
}

.resource-panel a {
    color: var(--accent);
    font-weight: 600;
    justify-self: start;
}

.resource-file-meta {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.resource-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.resource-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 600;
    border: 1px solid transparent;
    transition: var(--transition-fast);
}

.resource-action:hover,
.resource-action:focus-visible {
    background: var(--accent-soft-strong);
    border-color: var(--primary-border-soft);
}

.resource-empty {
    padding: 2.5rem;
    border-radius: var(--radius-md);
    border: 1px dashed var(--border);
    text-align: center;
    color: var(--text-muted);
    background: var(--surface-muted);
}

/* Responsive tweaks */

@media (max-width: 900px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
    }

    .logo {
        justify-content: center;
    }

    .logo-text h1 {
        font-size: 1.2rem;
    }

    .logo-text p {
        font-size: 0.85rem;
    }

    .admin-auth-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .admin-auth-copy {
        justify-items: center;
        text-align: center;
    }

    .admin-dashboard-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .admin-dashboard-meta {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .site-header .container {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
        gap: 0.75rem;
    }

    .header-actions .theme-toggle {
        flex-shrink: 0;
    }

    .main-nav ul {
        position: fixed;
        top: 130%;
        left: 50%;
        width: min(260px, 90vw);
        flex-direction: column;
        margin-top: 0.75rem;
        padding: 1.1rem;
        background: var(--surface-popover);
        border: 1px solid var(--border-popover);
        border-radius: 24px;
        box-shadow: var(--shadow-card);
        backdrop-filter: blur(18px);
    --mobile-nav-shift: 16px;
    transform-origin: center;
    transform: translate(calc(-50% + var(--mobile-nav-shift)), -50%) scale(0.9);
        opacity: 0;
        visibility: hidden;
        z-index: 80;
        transition: var(--transition);
        max-height: calc(100vh - 3rem);
        overflow-y: auto;
    }

    .main-nav ul[aria-expanded="true"] {
        opacity: 1;
        visibility: visible;
        transform: translate(calc(-50% + var(--mobile-nav-shift)), -50%) scale(1);
    }

    .main-nav li {
        width: 100%;
    }

    .main-nav li + li {
        margin-top: 0.6rem;
    }

    .main-nav a {
        display: block;
        padding: 0.85rem 1.1rem;
        background: var(--primary-soft);
        border-radius: 999px;
        text-align: center;
        border: 1px solid transparent;
    }

    .main-nav a:hover,
    .main-nav a:focus {
        background: var(--accent-soft);
        border-color: var(--primary-border-soft);
    }

    .nav-toggle {
        display: inline-flex;
    }

    .filters {
        flex-direction: column;
        align-items: stretch;
    }

    .hero .container {
        gap: 2.5rem;
    }

    .logo-image {
        width: 56px;
    }

    .admin-header .container {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .admin-actions {
        width: 100%;
        justify-content: center;
        gap: 0.75rem;
    }

    .admin-actions .btn {
        flex: 1;
        text-align: center;
    }

    .admin-section {
        padding: 1.75rem;
    }

    .admin-grid {
        gap: 1.5rem;
    }

    .admin-auth-form {
        padding: 1.5rem;
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .form-actions .btn {
        width: 100%;
    }
}

@media (max-width: 540px) {
    .hero {
        padding-top: 4rem;
    }

    .section {
        padding: 3rem 0;
    }

    .admin-section {
        padding: 1.6rem;
    }

    .container {
        width: 100%;
        padding-inline: 1.25rem;
    }

    .logo {
        gap: 0.75rem;
    }

    .logo-image {
        width: 48px;
    }

    .logo-text h1 {
        font-size: 1.05rem;
    }

    .section-header {
        text-align: center;
    }

    .hero-content p {
        font-size: 0.95rem;
    }

    .filters input,
    .filters select {
        flex: 1 1 auto;
    }

    .resource-search {
        margin-bottom: 1.5rem;
    }

    .admin-stats {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }

    .admin-stat-value {
        font-size: 1.65rem;
    }

    .admin-auth-form {
        padding: 1.35rem;
    }

    .admin-auth-perks li {
        font-size: 0.9rem;
    }

    .admin-dashboard-meta {
        gap: 0.5rem;
        flex-direction: column;
        align-items: flex-start;
    }

    .admin-preview-card .admin-preview {
        max-height: 420px;
    }
}

@media (max-width: 480px) {
    .resource-toggle {
        flex-direction: column;
        align-items: flex-start;
    }

    .resource-toggle-meta {
        width: 100%;
        justify-content: space-between;
    }

    .resource-panel {
        padding: 1rem 1rem 1.25rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .footer-links {
        width: 100%;
        justify-content: center;
    }

    .admin-actions {
        gap: 0.5rem;
    }

    .admin-preview-card .admin-preview {
        max-height: 320px;
    }

    .admin-dashboard-header {
        gap: 0.75rem;
    }

    .admin-auth-form {
        border-radius: var(--radius-md);
    }
}