/* ===================================
   Faczone — Design System
   Style médical, sobre et premium
   =================================== */

:root {
    /* Couleurs principales */
    --primary: #1E3A8A;
    --primary-dark: #1E3070;
    --primary-light: #3B5BA9;
    --primary-subtle: #E8EEF8;
    
    /* Neutres */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Accents */
    --success: #059669;
    --success-light: #D1FAE5;
    --warning: #D97706;
    --warning-light: #FEF3C7;
    --info: #0284C7;
    --info-light: #E0F2FE;
    
    /* Badges */
    --badge-cours: #1E3A8A;
    --badge-td: #059669;
    --badge-tp: #7C3AED;
    --badge-annales: #DC2626;
    
    /* Typographie */
    --font-display: 'Outfit', system-ui, sans-serif;
    --font-body: 'Plus Jakarta Sans', system-ui, sans-serif;
    
    /* Espacements */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Rayons */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-card: 0 2px 8px rgba(30, 58, 138, 0.08);
    --shadow-card-hover: 0 8px 24px rgba(30, 58, 138, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ===================================
   Reset & Base
   =================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

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

/* ===================================
   Header
   =================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    width: 36px;
    height: 36px;
    color: var(--primary);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link:hover::after {
    width: 100%;
}

.btn-disabled {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-400);
    background: var(--gray-100);
    border-radius: var(--radius-md);
    cursor: not-allowed;
    position: relative;
}

.btn-disabled:hover::after {
    content: 'Prototype';
    position: absolute;
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    color: var(--white);
    background: var(--gray-700);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    color: var(--gray-700);
}

.mobile-menu-btn svg {
    width: 24px;
    height: 24px;
}

.mobile-menu {
    display: none;
    flex-direction: column;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--white);
    border-top: 1px solid var(--gray-200);
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-700);
    padding: var(--space-sm) 0;
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
}

/* ===================================
   Pages
   =================================== */

.page {
    display: none;
    min-height: calc(100vh - 72px);
    padding-top: 72px;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg) var(--space-3xl);
}

/* ===================================
   Breadcrumb
   =================================== */

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: var(--space-lg);
}

.breadcrumb a {
    color: var(--primary);
    transition: opacity var(--transition-fast);
}

.breadcrumb a:hover {
    opacity: 0.7;
}

.breadcrumb span:last-child {
    color: var(--gray-700);
    font-weight: 500;
}

/* ===================================
   Page Titles
   =================================== */

.page-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-sm);
}

.page-subtitle {
    font-size: 1.05rem;
    color: var(--gray-500);
    margin-bottom: var(--space-xl);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    position: relative;
    min-height: calc(100vh - 72px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3xl) var(--space-lg);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(30, 58, 138, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(30, 58, 138, 0.08) 0%, transparent 40%),
        linear-gradient(180deg, var(--white) 0%, var(--gray-50) 100%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 1px 1px, var(--gray-200) 1px, transparent 0);
    background-size: 40px 40px;
    opacity: 0.5;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    animation: heroFadeIn 0.8s ease;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--space-lg);
}

.hero-title .highlight {
    color: var(--primary);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    background: var(--primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md), 0 0 0 0 rgba(30, 58, 138, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 0 4px rgba(30, 58, 138, 0.15);
}

.btn-primary svg {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-base);
}

.btn-primary:hover svg {
    transform: translateX(4px);
}

.btn-large {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.1rem;
}

/* ===================================
   How It Works Section
   =================================== */

.how-it-works {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--white);
    border-top: 1px solid var(--gray-200);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--space-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    flex: 1;
    max-width: 240px;
    text-align: center;
    padding: var(--space-lg);
}

.step-number {
    width: 32px;
    height: 32px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--white);
    background: var(--primary);
    border-radius: 50%;
}

.step-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-subtle);
    border-radius: var(--radius-lg);
    color: var(--primary);
}

.step-icon svg {
    width: 28px;
    height: 28px;
}

.step h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-xs);
}

.step p {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.step-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    color: var(--gray-300);
}

.step-arrow svg {
    width: 24px;
    height: 24px;
}

@media (max-width: 768px) {
    .steps {
        flex-direction: column;
        align-items: center;
    }
    
    .step-arrow {
        padding: var(--space-sm) 0;
        transform: rotate(90deg);
    }
}

/* ===================================
   Cards Grid
   =================================== */

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-lg);
}

.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-4px);
}

.card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-subtle);
    border-radius: var(--radius-md);
    color: var(--primary);
    transition: all var(--transition-base);
}

.card:hover .card-icon {
    background: var(--primary);
    color: var(--white);
}

.card-icon svg {
    width: 26px;
    height: 26px;
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-xs);
}

.card-subtitle {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.card-arrow {
    position: absolute;
    top: 50%;
    right: var(--space-lg);
    transform: translateY(-50%) translateX(8px);
    opacity: 0;
    color: var(--primary);
    transition: all var(--transition-base);
}

.card:hover .card-arrow {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

.card-arrow svg {
    width: 20px;
    height: 20px;
}

/* ===================================
   Courses Page
   =================================== */

.courses-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.search-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.search-box {
    flex: 1;
    min-width: 280px;
    max-width: 400px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.search-box svg {
    width: 20px;
    height: 20px;
    color: var(--gray-400);
    flex-shrink: 0;
}

.search-box input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 0.95rem;
    color: var(--gray-800);
    background: transparent;
}

.search-box input::placeholder {
    color: var(--gray-400);
}

.filter-buttons {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary);
}

.filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

/* ===================================
   Courses List
   =================================== */

.courses-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.course-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.course-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-card);
}

.course-icon {
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    color: var(--primary);
}

.course-icon svg {
    width: 24px;
    height: 24px;
}

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

.course-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-xs);
}

.course-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--gray-800);
}

.course-badge {
    padding: 2px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 999px;
    color: var(--white);
}

.course-badge.cours { background: var(--badge-cours); }
.course-badge.td { background: var(--badge-td); }
.course-badge.tp { background: var(--badge-tp); }
.course-badge.annales { background: var(--badge-annales); }

.course-date {
    font-size: 0.85rem;
    color: var(--gray-400);
}

.course-actions {
    display: flex;
    gap: var(--space-sm);
    flex-shrink: 0;
}

.btn-action {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-view {
    color: var(--primary);
    background: var(--primary-subtle);
}

.btn-view:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-dl {
    color: var(--gray-600);
    background: var(--gray-100);
}

.btn-dl:hover {
    background: var(--gray-200);
    color: var(--gray-800);
}

.btn-action svg {
    width: 16px;
    height: 16px;
}

@media (max-width: 640px) {
    .course-card {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .course-actions {
        width: 100%;
    }
    
    .course-actions .btn-action {
        flex: 1;
        justify-content: center;
    }
}

.no-results {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
    color: var(--gray-400);
}

.no-results svg {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
}

.no-results p {
    font-size: 1.1rem;
}

/* ===================================
   PDF Viewer
   =================================== */

.page-viewer {
    display: none;
    flex-direction: column;
    height: 100vh;
    padding-top: 0;
}

.page-viewer.active {
    display: flex;
}

.viewer-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background: var(--gray-900);
    color: var(--white);
}

.btn-back {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-300);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-back:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.btn-back svg {
    width: 18px;
    height: 18px;
}

.viewer-title {
    flex: 1;
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-download {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--white);
    background: var(--primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-download:hover {
    background: var(--primary-light);
}

.btn-download svg {
    width: 18px;
    height: 18px;
}

.viewer-container {
    flex: 1;
    margin-top: 64px;
    background: var(--gray-800);
}

.viewer-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.viewer-fallback {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--space-xl);
    text-align: center;
    color: var(--gray-400);
}

.viewer-fallback svg {
    width: 80px;
    height: 80px;
    margin-bottom: var(--space-lg);
    color: var(--gray-500);
}

.viewer-fallback h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-300);
    margin-bottom: var(--space-sm);
}

.viewer-fallback p {
    margin-bottom: var(--space-xl);
    line-height: 1.6;
}

/* ===================================
   Footer
   =================================== */

.footer {
    margin-top: auto;
    padding: var(--space-2xl) var(--space-lg);
    background: var(--gray-900);
    color: var(--gray-400);
    text-align: center;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--space-sm);
}

.footer-logo .logo-icon {
    width: 28px;
    height: 28px;
    color: var(--primary-light);
}

.footer-text {
    font-size: 0.9rem;
    margin-bottom: var(--space-lg);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.btn-disabled-small {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.85rem;
    color: var(--gray-500);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--gray-700);
    border-radius: var(--radius-sm);
    cursor: not-allowed;
}

.footer-copyright {
    font-size: 0.8rem;
    color: var(--gray-500);
}

/* ===================================
   Utilities
   =================================== */

.hidden {
    display: none !important;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================================
   Auth Buttons (Navbar)
   =================================== */

.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-login {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary);
    background: transparent;
    border: 1.5px solid var(--primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    font-family: inherit;
}

.btn-login:hover {
    background: var(--primary-subtle);
}

.btn-signup {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--white);
    background: var(--primary);
    border: 1.5px solid var(--primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    font-family: inherit;
}

.btn-signup:hover {
    background: var(--primary-dark);
}

/* User avatar in navbar */
.nav-user {
    position: relative;
}

.user-avatar-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 6px var(--space-sm) 6px 6px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-avatar-btn:hover {
    background: var(--gray-100);
}

.user-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.user-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 240px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 200;
    overflow: hidden;
    animation: fadeIn 0.15s ease;
}

.user-dropdown.open {
    display: block;
}

.dropdown-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
}

.dropdown-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    flex-shrink: 0;
}

.dropdown-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--gray-800);
}

.dropdown-email {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 2px;
    word-break: break-all;
}

.dropdown-sep {
    border: none;
    border-top: 1px solid var(--gray-100);
    margin: 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    text-align: left;
    transition: background var(--transition-fast);
    cursor: pointer;
    font-family: inherit;
}

.dropdown-item:hover {
    background: var(--gray-50);
}

.dropdown-logout {
    color: #DC2626;
}

.dropdown-logout:hover {
    background: #FEF2F2;
}

/* Footer auth links */
.btn-footer-link {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.85rem;
    color: var(--gray-300);
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--gray-700);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.btn-footer-link:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--white);
}

/* ===================================
   Auth Modal
   =================================== */

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal-overlay.open {
    display: flex;
    animation: fadeInOverlay 0.2s ease;
}

@keyframes fadeInOverlay {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.modal-card {
    position: relative;
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.25s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

.modal-close {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--gray-500);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.modal-close svg {
    width: 18px;
    height: 18px;
}

.modal-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--space-xl);
}

.modal-brand .logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.modal-tabs {
    display: flex;
    gap: 0;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: var(--space-xl);
}

.modal-tab {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-500);
    border-radius: calc(var(--radius-md) - 2px);
    transition: all var(--transition-fast);
    cursor: pointer;
    font-family: inherit;
}

.modal-tab.active {
    background: var(--white);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
    font-weight: 600;
}

.auth-subtitle {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-bottom: var(--space-lg);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

.input-password {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 10px var(--space-md);
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--gray-800);
    background: var(--white);
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.form-input.error {
    border-color: #DC2626;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.input-password .form-input {
    padding-right: 44px;
}

.toggle-pw {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.toggle-pw:hover {
    color: var(--gray-700);
}

.form-error {
    font-size: 0.85rem;
    color: #DC2626;
    min-height: 20px;
    padding: 0 2px;
}

.btn-block {
    width: 100%;
    justify-content: center;
    padding: 12px;
    font-size: 0.95rem;
    margin-top: var(--space-sm);
}

.auth-switch {
    text-align: center;
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: var(--space-xs);
}

.link-btn {
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ===================================
   Toast Notification
   =================================== */

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--gray-900);
    color: var(--white);
    padding: 12px var(--space-lg);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-xl);
    z-index: 2000;
    transition: transform 0.3s ease, opacity 0.3s ease;
    opacity: 0;
    white-space: nowrap;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: #DC2626;
}

/* Mobile responsive for modal */
@media (max-width: 480px) {
    .modal-card {
        padding: var(--space-xl) var(--space-lg);
        border-radius: var(--radius-lg);
    }

    .nav-auth {
        display: none;
    }
}

/* ===================================
   Bibliothèque — Book Cards
   =================================== */

.books-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.book-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    animation: fadeIn 0.3s ease both;
}

.book-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-card);
}

.book-icon {
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-subtle);
    border-radius: var(--radius-md);
    color: var(--primary);
}

.book-icon svg { width: 26px; height: 26px; }

.book-info { flex: 1; min-width: 0; }

.book-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: 4px;
}

.book-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--gray-800);
}

.book-badge {
    padding: 2px 10px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-subtle);
    border-radius: 999px;
    white-space: nowrap;
}

.book-author {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 4px;
}

.book-desc {
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.5;
}

@media (max-width: 640px) {
    .book-card {
        flex-wrap: wrap;
    }
    .book-card .course-actions {
        width: 100%;
        justify-content: flex-start;
    }
}

/* ===================================
   CTA Banner
   =================================== */

.cta-banner {
    background: var(--primary-subtle);
    border-top: 1px solid rgba(30, 58, 138, 0.12);
    padding: 14px var(--space-lg);
    text-align: center;
}

.cta-banner p {
    font-size: 0.95rem;
    color: var(--gray-600);
}

.cta-link {
    color: var(--primary);
    font-weight: 600;
    font-size: inherit;
    font-family: inherit;
    text-decoration: underline;
    text-underline-offset: 2px;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.cta-link:hover {
    color: var(--primary-dark);
}