:root {
    --bg: #020617;
    --card: rgba(15,23,42,0.95);
    --card-alt: rgba(15,23,42,0.98);
    --accent: #38bdf8;
    --accent-soft: rgba(56,189,248,0.15);
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --border: rgba(15,23,42,0.9);
}

/* Reset de base */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top, #1f2937 0, #020617 55%);
    color: var(--text);
}

/* Layout global */
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: radial-gradient(circle at top, rgba(15,23,42,0.98), rgba(15,23,42,0.92));
    border-bottom: 1px solid rgba(15,23,42,0.9);
    backdrop-filter: blur(10px);
}

.site-header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0.6rem 1.2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 600;
    font-size: 0.95rem;
}

.brand-logo {
    width: 26px;
    height: 26px;
    border-radius: 999px;
    border: 1px solid var(--accent-soft);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    background: radial-gradient(circle at top left, var(--accent-soft), transparent);
}

.brand-text {
    letter-spacing: 0.03em;
}

.site-main {
    padding: 1.5rem 1.2rem 2.5rem;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

/* Nav */
.site-nav {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    align-items: center;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    font-size: 0.78rem;
    color: var(--text-muted);
    text-decoration: none;
    border: 1px solid transparent;
}

.nav-link:hover {
    color: var(--text);
    border-color: rgba(148,163,184,0.6);
    background: rgba(15,23,42,0.7);
}

.nav-link--active {
    color: var(--accent);
    border-color: var(--accent-soft);
    background: var(--accent-soft);
}

.nav-icon {
    font-size: 0.9rem;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.theme-toggle {
    border: 1px solid rgba(148,163,184,0.5);
    border-radius: 999px;
    padding: 0.2rem 0.6rem;
    background: rgba(15,23,42,0.7);
    color: var(--text-muted);
    font-size: 0.78rem;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
}

.theme-toggle .icon {
    font-size: 0.9rem;
}

/* Accueil : cards */
h1 {
    text-align: center;
    font-size: 2.1rem;
    margin: 0 0 0.3rem;
}

.subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.4rem;
    margin-top: 1.2rem;
}

a.card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: radial-gradient(circle at top left, var(--card-alt), var(--card));
    border-radius: 16px;
    padding: 1rem 1.1rem;
    border: 1px solid var(--border);
    box-shadow: 0 18px 50px rgba(0,0,0,0.55);
    text-decoration: none;
    color: inherit;
    transition:
        transform 0.15s ease,
        box-shadow 0.15s ease,
        border-color 0.15s ease,
        background 0.15s ease;
}

a.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 24px 60px rgba(0,0,0,0.7);
    border-color: var(--accent-soft);
    background: radial-gradient(circle at top left, rgba(56,189,248,0.12), var(--card));
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: #f9fafb;
}

.card-subtitle {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.35;
    margin-bottom: 0.6rem;
}

.card-tag {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    padding: 0.08rem 0.45rem;
    border-radius: 999px;
    font-size: 0.7rem;
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid rgba(56,189,248,0.4);
}

/* Footer */
.page-footer {
    margin-top: 1.4rem;
    text-align: center;
    font-size: 0.8rem;
    color: #6b7280;
}

.page-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

.page-footer a:hover {
    text-decoration: underline;
}

.site-footer {
    border-top: 1px solid rgba(15,23,42,0.8);
    padding: 0.8rem 1.2rem 1.2rem;
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
}

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

@media (max-width: 640px) {
    .site-header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    h1 {
        font-size: 1.6rem;
    }
}