:root {
    /* Mode Clair */
    --bg-body: #F5F5F7;
    /* On passe à 0.6 pour voir le contenu passer derrière */
    --bg-card: rgba(255, 255, 255, 0.65);
    /* Nav plus transparente (0.6) pour l'effet de flou */
    --bg-nav: rgba(255, 255, 255, 0.6);

    --text-main: #1D1D1F;
    --text-secondary: #86868B;
    --accent-color: #0071E3;
    --border-color: rgba(0, 0, 0, 0.05);
    --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.1);
    --radius-card: 24px;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
    /* Mode Sombre */
    --bg-body: #000000;
    --bg-card: rgba(28, 28, 30, 0.6);
    /* Nav sombre transparente */
    --bg-nav: rgba(28, 28, 30, 0.6);

    --text-main: #F5F5F7;
    --text-secondary: #98989D;
    --accent-color: #2997FF;
    --border-color: rgba(255, 255, 255, 0.15);
    --shadow-card: 0 10px 40px -10px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .top-blur-mask {
    background: linear-gradient(to bottom,
            var(--bg-body) 0%,
            rgba(0, 0, 0, 0) 100%);
}

/* --- RESET & BASE --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.4s ease, color 0.4s ease;
    -webkit-font-smoothing: antialiased;
    padding-top: 150px;
    /* Espace pour la nav flottante */
}

.top-blur-mask {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 180px;
    /* La hauteur de la zone de flou */
    z-index: 900;
    /* Au-dessus du contenu, mais SOUS la navbar (qui est à 1000) */
    pointer-events: none;
    /* Très important : permet de cliquer au travers */

    /* 1. L'effet de flou progressif */
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);

    /* 2. Le fondu vers la couleur de fond (simule la perte d'opacité) */
    background: linear-gradient(to bottom,
            var(--bg-body) 0%,
            /* En haut : couleur du fond opaque (contenu invisible) */
            rgba(255, 255, 255, 0) 100%
            /* En bas : transparent (contenu visible) */
        );

    /* 3. Masque pour adoucir la transition du flou */
    mask-image: linear-gradient(to bottom, black 20%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 20%, transparent 100%);
}

a {
    text-decoration: none;
    color: var(--text-main);
    transition: 0.2s;
}

ul {
    list-style: none;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px 40px;
}

/* --- NAVIGATION FLOTTANTE (Dynamic Island) --- */
.navbar {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 900px;
    background: var(--bg-nav);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-radius: 100px;
    padding: 0 25px;
    height: 65px;
    z-index: 1000;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 25px;
    align-items: center;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0.7;
}

.nav-links a:hover,
.nav-links a.active {
    opacity: 1;
    color: var(--accent-color);
}

/* --- SWITCH LIQUID GLASS (Theme) --- */
.glass-switch {
    width: 56px;
    height: 30px;
    background: rgba(120, 120, 128, 0.2);
    border-radius: 50px;
    position: relative;
    cursor: pointer;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.switch-icons {
    position: absolute;
    width: 100%;
    top: 0;
    left: 0;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 8px;
    font-size: 12px;
    pointer-events: none;
}

.switch-knob {
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 3px;
    left: 4px;
    z-index: 2;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);

    /* MODIFICATION ICI : Animation simple et fluide (Ease) */
    transition: transform 0.3s ease;
}

[data-theme="dark"] .glass-switch {
    background: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .switch-knob {
    transform: translateX(24px);
    background: var(--accent-color);
}

/* --- HERO & TITRES --- */
.hero {
    text-align: center;
    padding: 60px 0 80px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -1.5px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--text-main) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 30px;
}

.btn {
    background-color: var(--accent-color);
    color: white;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-block;
    box-shadow: 0 4px 15px rgba(0, 113, 227, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 113, 227, 0.4);
}

/* --- GRID BENTO (SAE) --- */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 30px;
    letter-spacing: -1px;
}

.sae-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.sae-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-card);
    padding: 25px;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sae-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--shadow-card);
}

.tag {
    align-self: flex-start;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--accent-color);
    background: rgba(0, 113, 227, 0.1);
    padding: 5px 12px;
    border-radius: 12px;
    margin-bottom: 15px;
}

.sae-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.sae-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
}

.btn-small {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.9rem;
    margin-top: auto;
}

/* --- PAGES DÉTAIL & TABLEAU --- */
.content-block {
    background: var(--bg-card);
    padding: 35px;
    border-radius: var(--radius-card);
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    border-radius: 12px;
    overflow: hidden;
    font-size: 0.95rem;
}

.custom-table th,
.custom-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.custom-table th {
    background-color: rgba(120, 120, 120, 0.1);
    font-weight: 600;
}

/* Mobile */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .navbar {
        padding: 0 15px;
    }

    .nav-links a {
        display: none;
    }

    /* Cache les liens textes sur mobile */
    .nav-links .glass-switch {
        display: flex;
    }

    /* Garde le switch */
    /* Ajouter icone menu burger ici si besoin */
}

/* --- MENU BURGER (Mobile) --- */
.burger-menu {
    display: none;
    /* Caché sur PC */
    flex-direction: column;
    gap: 6px;
    cursor: pointer;

    position: relative;
    z-index: 2001;
    /* Supérieur à la navbar (1000) et au masque (900) */
    width: 30px;
    /* Donne une zone de clic explicite */
    height: 30px;
    justify-content: center;
    /* Centre les barres */
}

.burger-menu span {
    width: 25px;
    height: 2px;
    background-color: var(--text-main);
    border-radius: 2px;
    transition: 0.3s;
}

/* À ajouter à la fin de style.css */

/* Quand le menu est ouvert (classe ajoutée par le JS) */
.burger-menu.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.burger-menu.open span:nth-child(2) {
    transform: rotate(-45deg) translate(5px, -6px);
}


/* --- RESPONSIVE : TABLETTES & MOBILES --- */
@media (max-width: 768px) {
    .navbar {
        padding: 0 20px;
    }

    /* Affiche le burger */
    .burger-menu {
        display: flex;
    }

    /* LE MENU DÉROULANT */
    .nav-links {
        /* Positionnement */
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;

        /* --- LE FLOU FORCÉ --- */
        /* Fond blanc translucide (0.7 = 70% visible) */
        background-color: rgba(255, 255, 255, 1) !important;

        /* Le moteur de flou (valeur élevée pour bien voir l'effet) */
        -webkit-backdrop-filter: blur(30px) !important;
        /* Pour Safari/Chrome */
        backdrop-filter: blur(30px) !important;
        /* Standard */

        /* Ombre pour détacher le menu du fond */
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);

        /* Style du bloc */
        padding: 30px;
        border-radius: 40px;
        border: 1px solid rgba(255, 255, 255, 0.3);

        /* Caché par défaut */
        display: none;
        flex-direction: column;
        align-items: center;
        gap: 20px;
        z-index: 2000;
    }

    /* VERSION DARK MODE */
    [data-theme="dark"] .nav-links {
        /* Noir translucide */
        background-color: rgba(20, 20, 20, 1) !important;
        border: 1px solid rgba(255, 255, 255, 0.1);
    }

    /* QUAND C'EST OUVERT */
    .nav-links.mobile-visible {
        display: flex;
    }

    .nav-links a {
        display: block;
        font-size: 1.2rem;
        font-weight: 600;
    }
}