/* ═══════════════════════════════════════════════════════════
   StudyLink — Design System (Liquid Glass)
   main.css — Variables globales, reset, composants de base
   ═══════════════════════════════════════════════════════════ */

/* ── CSS Reset ───────────────────────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ── Palette & Tokens ────────────────────────────────────── */
:root {
    /* Couleurs */
    --color-primary:       #8B52FA;
    --color-primary-dark:  #6B35D9;
    --color-primary-light: #C4A8FD;
    --color-lavender:      #F3EFFF;
    --color-dark:          #2D2D2D;
    --color-white:         #FFFFFF;
    --color-gray-50:       #FAFAFA;
    --color-gray-100:      #F8F9FA;
    --color-gray-200:      #F1F3F5;
    --color-gray-300:      #E9ECEF;
    --color-gray-400:      #CED4DA;
    --color-gray-500:      #ADB5BD;
    --color-gray-600:      #868E96;
    --color-gray-700:      #495057;
    --color-gray-800:      #343A40;
    --color-success:       #2ECC71;
    --color-warning:       #F59E0B;
    --color-danger:        #EF4444;

    /* Liquid Glass */
    --glass-bg:            rgba(255, 255, 255, 0.75);
    --glass-bg-hover:      rgba(255, 255, 255, 0.90);
    --glass-bg-dark:       rgba(45, 45, 45, 0.6);
    --glass-blur:          blur(20px) saturate(180%);
    --glass-border:        1px solid rgba(255, 255, 255, 0.35);
    --glass-shadow:        0 8px 32px rgba(139, 82, 250, 0.12);

    /* Typographie */
    --font-family:         'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs:        0.75rem;
    --font-size-sm:        0.875rem;
    --font-size-base:      1rem;
    --font-size-lg:        1.125rem;
    --font-size-xl:        1.25rem;
    --font-size-2xl:       1.5rem;
    --font-size-3xl:       2rem;

    /* Espacements */
    --space-1: 4px;   --space-2: 8px;   --space-3: 12px;
    --space-4: 16px;  --space-5: 20px;  --space-6: 24px;
    --space-8: 32px;  --space-10: 40px; --space-12: 48px;
    --space-16: 64px;

    /* Bordures */
    --radius-sm:  8px;
    --radius-md:  16px;
    --radius-lg:  20px;
    --radius-xl:  28px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast:   all 0.15s ease;
    --transition-base:   all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Z-index */
    --z-dropdown:   100;
    --z-sticky:     200;
    --z-overlay:    300;
    --z-modal:      400;
    --z-toast:      500;

    /* Layout */
    --navbar-height: 64px;
    --sidebar-width: 240px;
    --sidebar-right-width: 320px;
    --feed-max-width: 640px;
    --bottom-nav-height: 64px;
}

/* ── Base ─────────────────────────────────────────────────── */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-dark);
    background-color: var(--color-gray-100);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

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

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

input, textarea, select, button {
    font-family: inherit;
    font-size: inherit;
}

.hidden { display: none !important; }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    line-height: 1;
}

.btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 4px 14px rgba(139, 82, 250, 0.35);
}

.btn--primary:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 6px 20px rgba(139, 82, 250, 0.45);
    transform: translateY(-1px);
}

.btn--outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn--outline:hover {
    background: var(--color-lavender);
}

.btn--ghost {
    background: rgba(139, 82, 250, 0.1);
    color: var(--color-primary);
}

.btn--ghost:hover {
    background: rgba(139, 82, 250, 0.18);
}

.btn--sm {
    padding: 6px 16px;
    font-size: var(--font-size-xs);
}

.btn--full {
    width: 100%;
}

.btn--danger {
    background: var(--color-danger);
    color: white;
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
}

.btn--danger:hover {
    background: #DC2626;
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
    transform: translateY(-1px);
}

/* ── Navbar ───────────────────────────────────────────────── */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: var(--glass-border);
    z-index: var(--z-sticky);
    padding: 0 var(--space-6);
    max-width: 100vw;
    overflow: hidden;
}

.navbar__container {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.navbar__logo {
    display: flex;
    gap: var(--space-2);
    text-decoration: none;
    
}





.navbar__search {
    flex: 1;
    max-width: 420px;
    position: relative;
}

.navbar__logo img {
    height: 28px;
    width: 28px;
   
}

.navbar__search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-500);
}

.navbar__search-input {
    width: 100%;
    padding: 10px 16px 10px 42px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-full);
    background: var(--color-gray-100);
    font-size: var(--font-size-sm);
    color: var(--color-dark);
    outline: none;
    transition: var(--transition-base);
}

.navbar__search-input:focus {
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(139, 82, 250, 0.15);
}

.navbar__search-input::placeholder {
    color: var(--color-gray-500);
}

.navbar__actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-left: auto;
}

.navbar__btn {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--color-gray-700);
    cursor: pointer;
    transition: var(--transition-fast);
}

.navbar__btn:hover {
    background: var(--color-gray-200);
}

.navbar__badge {
    position: absolute;
    top: 2px;
    right: 2px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: var(--radius-full);
    background: var(--color-danger);
    color: white;
    font-size: 11px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.navbar__avatar-link {
    display: flex;
}

.navbar__avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--color-primary);
    transition: var(--transition-fast);
}

.navbar__avatar:hover {
    box-shadow: 0 0 0 3px rgba(139, 82, 250, 0.2);
}

.navbar__logout-btn {
    color: var(--color-gray-600);
}

.navbar__logout-btn:hover {
    background: #FEF2F2;
    color: var(--color-danger);
}

#logout-form {
    display: flex;
    align-items: center;
    margin: 0;
    padding: 0;
    border: none;
    background: none;
}

/* ── Notifications Dropdown ───────────────────────────────── */
.notif-dropdown {
    position: fixed;
    top: calc(var(--navbar-height) + 4px);
    right: var(--space-6);
    width: 380px;
    max-height: 480px;
    background: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
    border: 1px solid var(--color-gray-200);
    z-index: var(--z-dropdown);
    overflow: hidden;
}

.notif-dropdown__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-gray-200);
}

.notif-dropdown__header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.notif-dropdown__read-all {
    border: none;
    background: none;
    color: var(--color-primary);
    font-size: var(--font-size-xs);
    cursor: pointer;
    font-weight: 500;
}

.notif-dropdown__list {
    overflow-y: auto;
    max-height: 400px;
    padding: var(--space-2) 0;
}

.notif-dropdown__empty {
    padding: var(--space-8);
    text-align: center;
    color: var(--color-gray-500);
}

.notif-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    cursor: pointer;
    transition: var(--transition-fast);
}

.notif-item:hover {
    background: var(--color-gray-100);
}

.notif-item--unread {
    background: var(--color-lavender);
}

.notif-item__avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.notif-item__text {
    font-size: var(--font-size-sm);
    color: var(--color-dark);
    line-height: 1.4;
}

.notif-item__time {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
    margin-top: 2px;
}

/* ── Main Content ─────────────────────────────────────────── */
.main-content {
    padding-top: var(--navbar-height);
    min-height: 100vh;
}

/* ── Toast Notifications ──────────────────────────────────── */
.toast-container {
    position: fixed;
    top: calc(var(--navbar-height) + var(--space-4));
    right: var(--space-4);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
    border-left: 4px solid var(--color-primary);
    font-size: var(--font-size-sm);
    animation: slideInRight 0.3s ease-out;
    max-width: 360px;
}

.toast--success { border-left-color: var(--color-success); }
.toast--error { border-left-color: var(--color-danger); }
.toast--warning { border-left-color: var(--color-warning); }

.toast__close {
    margin-left: auto;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--color-gray-500);
    padding: 4px;
}

/* ── Modal ────────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: var(--z-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    max-width: 480px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    animation: scaleIn 0.2s ease-out;
}

.modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-gray-200);
}

.modal__header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal__close {
    border: none;
    background: none;
    cursor: pointer;
    color: var(--color-gray-600);
    padding: 4px;
}

.modal__body {
    padding: var(--space-5) var(--space-6);
}

.modal__reasons {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.modal__reason {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal__reason:hover {
    border-color: var(--color-primary);
    background: var(--color-lavender);
}

.modal__reason input[type="radio"] {
    accent-color: var(--color-primary);
}

.modal__description {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    resize: vertical;
    min-height: 80px;
    outline: none;
    font-family: inherit;
}

.modal__description:focus {
    border-color: var(--color-primary);
}

.modal__footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-gray-200);
}

/* ── Bottom Navigation (Mobile) ───────────────────────────── */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-top: var(--glass-border);
    display: none;
    align-items: center;
    justify-content: space-around;
    padding: 0 var(--space-2);
    z-index: var(--z-sticky);
}

.bottom-nav__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    text-decoration: none;
    color: var(--color-gray-600);
    font-size: 10px;
    font-weight: 500;
    transition: var(--transition-fast);
    padding: var(--space-1);
}

.bottom-nav__item--active {
    color: var(--color-primary);
}

.bottom-nav__fab {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(139, 82, 250, 0.4);
    transform: translateY(-12px);
    transition: var(--transition-spring);
}

.bottom-nav__fab:hover {
    transform: translateY(-14px) scale(1.05);
}

/* ── Animations ───────────────────────────────────────────── */
@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes scaleIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

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

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

@keyframes heartBeat {
    0% { transform: scale(1); }
    25% { transform: scale(1.3); }
    50% { transform: scale(1); }
    75% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.animate-slide-in {
    animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.animate-heart {
    animation: heartBeat 0.4s ease;
}

/* ── Skeleton Loading ─────────────────────────────────────── */
.skeleton {
    background: linear-gradient(90deg, var(--color-gray-200) 25%, var(--color-gray-100) 50%, var(--color-gray-200) 75%);
    background-size: 200% 100%;
    animation: pulse 1.5s ease infinite;
    border-radius: var(--radius-sm);
}

.skeleton--circle {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.skeleton--text {
    height: 14px;
    margin-bottom: var(--space-2);
}

.skeleton--w40 { width: 40%; }
.skeleton--w60 { width: 60%; }
.skeleton--w70 { width: 70%; }
.skeleton--w80 { width: 80%; }
.skeleton--w90 { width: 90%; }
.skeleton--w100 { width: 100%; }

.skeleton-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.skeleton-card__header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.skeleton-card__meta {
    flex: 1;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1024px) {
    .sidebar--right {
        display: none;
    }
}

@media (max-width: 768px) {
    .navbar__search {
        display: none;
    }

    .sidebar--left {
        display: none;
    }

    .bottom-nav {
        display: flex;
    }

    .main-content {
        padding-bottom: var(--bottom-nav-height);
    }

    .fab {
        bottom: calc(var(--bottom-nav-height) + var(--space-4));
        display: none;
    }

    /* Notification dropdown : adapté à la largeur de l'écran */
    .notif-dropdown {
        left: var(--space-3);
        right: var(--space-3);
        width: auto;
        max-width: 100%;
    }

    /* Toast : ne dépasse pas le viewport */
    .toast-container {
        left: var(--space-3);
        right: var(--space-3);
    }

    .toast {
        max-width: 100%;
    }

    /* Modal : toujours dans le viewport */
    .modal {
        width: calc(100% - var(--space-8));
        max-width: 100%;
    }
}