:root {
    --primary: #3b82f6;       /* Bleu Data */
    --accent: #10b981;        /* Vert succès/code */
    --dark-bg: #0f172a;       /* Fond très sombre */
    --glass: rgba(30, 41, 59, 0.75); /* Effet verre */
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --border-glass: rgba(255, 255, 255, 0.1);
}

body {
    margin: 0;
    font-family: 'Inter', 'Segoe UI', sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* --- Parallax Hero --- */
.parallax-hero {
    /* Image suggérée : Réseau abstrait / Data */
    background-image: url('https://images.unsplash.com/photo-1558494949-ef526b004297?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
    height: 60vh;
    background-attachment: fixed; /* Clé du parallaxe CSS */
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.parallax-hero::after {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(to bottom, rgba(15,23,42,0.4), var(--dark-bg));
}

.hero-content {
    position: relative; z-index: 2; text-align: center;
    text-shadow: 0 4px 10px rgba(0,0,0,0.5);
}

.hero-content h1 { font-size: 3.5rem; margin: 0; letter-spacing: -1px; color: #fff; }
.hero-content p { font-size: 1.2rem; color: var(--primary); font-weight: 700; letter-spacing: 2px; margin-top: 10px; }

/* --- Navigation --- */
nav {
    position: fixed; top: 0; width: 100%; z-index: 100; padding: 20px 40px;
    display: flex; justify-content: flex-end; gap: 30px;
    transition: all 0.3s ease;
    box-sizing: border-box;
}
nav.scrolled {
    background: rgba(15, 23, 42, 0.95);
    border-bottom: 1px solid var(--border-glass);
    padding: 15px 40px;
}
nav a { color: var(--text-main); text-decoration: none; font-weight: 500; font-size: 0.95rem; text-transform: uppercase; }
nav a:hover { color: var(--primary); }
.admin-link { color: var(--text-muted); font-size: 0.8rem; }

/* --- Content Cards --- */
.container { max-width: 900px; margin: -60px auto 60px; position: relative; z-index: 10; padding: 0 20px; }

.content-card {
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.card-header h2 { margin-top: 0; color: var(--primary); border-bottom: 1px solid var(--border-glass); padding-bottom: 15px; }

/* --- Markdown Styling --- */
.rendered-content h3 { color: #fff; margin-top: 30px; }
.rendered-content ul { padding-left: 20px; color: var(--text-muted); }
.rendered-content li { margin-bottom: 8px; }
.rendered-content blockquote { border-left: 4px solid var(--accent); margin: 20px 0; padding-left: 20px; font-style: italic; color: var(--text-muted); }
.rendered-content table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.rendered-content th, .rendered-content td { border: 1px solid var(--border-glass); padding: 10px; text-align: left; }
.rendered-content th { background: rgba(255,255,255,0.05); color: var(--accent); }

/* Code Blocks */
.rendered-content pre { border-radius: 8px; overflow-x: auto; background: #282c34; }
.rendered-content code { font-family: 'Fira Code', monospace; font-size: 0.9em; }
p code { background: rgba(255,255,255,0.1); padding: 2px 6px; border-radius: 4px; color: var(--accent); }

footer { text-align: center; color: var(--text-muted); padding: 40px; font-size: 0.9rem; }