:root {
    --bg: #0b1220;
    --fg: #e5e7eb;
    --muted: #94a3b8;
    --card: #111827;
    --border: #1f2937;
    --primary: #4f46e5;
    --primary-weak: rgba(79,70,229,.15);

    --radius: 12px;
    --radius-pill: 999px;

    --container: 980px;

    --shadow-soft: 0 6px 24px rgba(0,0,0,.35);
    --shadow-btn: 0 8px 20px rgba(79,70,229,.25);
    --shadow-btn-hover: 0 10px 26px rgba(79,70,229,.35);
}

/* Reset minimal et base */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: var(--fg);
    background: radial-gradient(1000px 600px at 10% -10%, #111936 0%, transparent 60%), var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Conteneur */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 16px;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(11,18,32,.8);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}
.site-header .container {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
}

/* Actions à droite (dropdown seulement) */
.header-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Navigation */
.nav {
    display: flex;
    gap: 12px;
    flex: 1;
}
.nav__link {
    color: var(--fg);
    text-decoration: none;
    padding: 8px 10px;
    border-radius: 8px;
    transition: background 0.2s ease, color 0.2s ease;
}
.nav__link:hover { 
    background: var(--primary-weak);
    transform: translateY(-1px);
}
.nav__link:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    background: var(--primary-weak);
    border-radius: 8px;
}

/* Dropdown Certifications */
.nav__dropdown { position: relative; }
.nav__dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
}
.nav__dropdown-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 6px);
    display: none;
    min-width: 160px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 4px;
    z-index: 20;
    box-shadow: var(--shadow-soft);
}
.nav__dropdown.open .nav__dropdown-menu { 
    display: block;
    animation: fadeInDown 0.15s ease-out;
}
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}
.nav__dropdown-item { 
    display: block; 
    padding: 8px 10px; 
    border-radius: 6px; 
    text-decoration: none;
    transition: background 0.15s ease;
}
.nav__dropdown-item:hover,
.nav__dropdown-item:focus-visible { background: var(--primary-weak); }

/* Bouton de header */
.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border);
    color: var(--fg);
    padding: 8px 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s ease;
}
.nav-toggle:hover { background: var(--primary-weak); }

/* Hero */
.hero {
    padding: 72px 0 24px;
}
.hero__content {
    display: grid;
    grid-template-columns: 160px 1fr;
    align-items: center;
    gap: 24px;
}
.hero__avatar {
    border-radius: 100%;
    border: 2px solid var(--border);
    box-shadow: var(--shadow-soft);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.hero__avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 32px rgba(79,70,229,.2);
}
.hero__title {
    margin: 0 0 8px;
    font-size: clamp(28px, 4vw, 44px);
}
.hero__subtitle {
    margin: 0 0 16px;
    color: var(--muted);
    font-size: 16px;
}
.hero__actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Contact */
.contact { display: none; }

/* Boutons génériques */
.btn {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    padding: 11px 16px;
    border-radius: 10px;
    font-weight: 600;
    box-shadow: var(--shadow-btn);
    transition: transform .08s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { 
    transform: translateY(-2px); 
    box-shadow: var(--shadow-btn-hover); 
}
.btn:active { transform: translateY(0); }
.btn--ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--fg);
    box-shadow: none;
}

/* Sections */
.section { 
    padding: 28px 0; 
    scroll-margin-top: 80px;
}
.section + .section { border-top: 1px solid var(--border); }
.section__title { margin: 0 0 14px; font-size: 22px; }

/* Grilles et cartes */
.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    transition: transform 0.2s ease, box-shadow 0.3s ease;
}
.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,.25);
}
.card__header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 8px;
}
.card__title { margin: 0; font-size: 18px; }
.card__meta { color: var(--muted); font-size: 14px; }
.card__list { margin: 0; padding-left: 18px; }

.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.tag {
    background: var(--primary-weak);
    color: #c7c9ff;
    border: 1px solid var(--border);
    padding: 4px 8px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    transition: all 0.2s ease;
}
.tag:hover {
    transform: scale(1.05);
    background: var(--primary);
    color: white;
}

/* Pied de page */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 18px 0;
    color: var(--muted);
}
.site-footer .footer-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 8px 0 0;
}
.site-footer .footer-links li {
    display: flex;
    align-items: center;
    gap: 6px;
}
.site-footer .footer-links a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}
.site-footer .footer-links a:hover {
    color: var(--primary);
}

/* Accessibilité */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* Responsive */
@media (max-width: 960px) {
    .hero { padding: 64px 0 20px; }
    .hero__content { grid-template-columns: 140px 1fr; gap: 20px; }
    .grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
    .site-header .container {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 12px 16px;
        justify-content: space-between;
    }

    .nav-toggle--side {
        position: fixed;
        left: 12px;
        top: 50%;
        transform: translateY(-50%);
        z-index: 1000;
        background: rgba(11,18,32,.95);
        border: 1px solid var(--border);
        border-radius: 10px;
        padding: 10px 12px;
        box-shadow: var(--shadow-soft);
        backdrop-filter: blur(8px);
    }
    
    .nav-toggle {
        display: inline-block;
        background: none;
        border: 1px solid var(--border);
        color: var(--fg);
        padding: 8px 10px;
        border-radius: 8px;
    }
    
    .nav {
        position: absolute;
        left: 16px; 
        right: 16px; 
        top: 56px;
        background: rgba(11,18,32,.95);
        border: 1px solid var(--border);
        border-radius: 10px;
        padding: 8px;
        display: none;
        flex-direction: column;
        backdrop-filter: blur(8px);
    }
    .nav.open { 
        display: flex;
        animation: fadeInDown 0.2s ease-out;
    }

    /* Dropdown en mobile: s'affiche inline sous le bouton */
    .nav__dropdown-menu {
        position: static;
        display: none;
        background: transparent;
        border: 0;
        box-shadow: none;
        padding: 0 0 0 8px;
    }
    .nav__dropdown.open .nav__dropdown-menu { display: block; }

    .hero__content { grid-template-columns: 1fr; text-align: center; }
    .hero__actions { justify-content: center; }
    .grid { grid-template-columns: 1fr; }
    
    /* Amélioration des tags sur mobile */
    .tags { gap: 6px; }
    .tag { font-size: 11px; padding: 3px 6px; }
}

/* Navigation latérale desktop */
@media (min-width: 721px) {
    body.side-nav .site-header {
        transform: translateY(-100%);
        transition: transform 0.3s ease;
    }
    
    /* Navigation latérale flottante */
    body.side-nav .nav {
        position: fixed;
        left: 20px;
        top: 310px;
        transform: translateY(-50%);
        display: flex;
        flex-direction: column;
        gap: 8px;
        background: rgba(11,18,32,.95);
        border: 1px solid var(--border);
        border-radius: 10px;
        padding: 8px;
        box-shadow: var(--shadow-soft);
        z-index: 1000;
        width: max-content;
        max-width: 260px;
        backdrop-filter: blur(8px);
        transition: all 0.3s ease;
    }
    body.side-nav .nav .nav__link {
        padding: 8px 12px;
        white-space: nowrap;
    }
    
    /* Boutons flottants pour certifications seulement */
    body.side-nav .header-actions {
        position: fixed;
        right: 20px;
        top: 35px;
        z-index: 1000;
        background: rgba(11,18,32,.95);
        border: 1px solid var(--border);
        border-radius: 10px;
        padding: 8px;
        box-shadow: var(--shadow-soft);
        backdrop-filter: blur(8px);
        transition: all 0.3s ease;
    }
    
    /* Ajuster la position du dropdown certifications en mode latéral */
    body.side-nav .nav__dropdown-menu {
        right: 0;
        top: calc(100% + 6px);
    }
}

/* Préférence utilisateur: réduire les animations */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .btn, .card, .nav__link, .hero__avatar, .tag { transition: none; }
    .nav.open, .nav__dropdown-menu { animation: none; }
}