/* =====================================================
   COURS CSS3 - STYLESHEET
   Créé par Geoffroy Streit - 2025
   ===================================================== */

:root {
    --primary: #264de4;
    --secondary: #2965f1;
    --accent: #00d4ff;
    --bg: #0a0f1a;
    --bg2: #0f1829;
    --card: #141e33;
    --text: #e8f0ff;
    --muted: #8ba3c7;
    --dim: #5a7094;
    --border: #1e3a5f;
    --green: #10b981;
    --purple: #a855f7;
    --pink: #ec4899;
    --orange: #f59e0b;
    --red: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Outfit', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
}

/* === LAYOUT === */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* === HEADER === */
header {
    position: sticky;
    top: 0;
    background: rgba(10, 15, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    padding: 16px 0;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.3rem;
    font-weight: 700;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 700;
}

nav { display: flex; gap: 4px; }
nav a {
    color: var(--muted);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    transition: all 0.2s;
}
nav a:hover {
    background: var(--card);
    color: var(--text);
}

/* === HERO === */
.hero {
    padding: 70px 0 50px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    background: radial-gradient(ellipse at top, rgba(38, 77, 228, 0.1) 0%, transparent 60%);
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text), var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 16px;
}

.hero p {
    color: var(--muted);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.05rem;
}

/* === TOC === */
.toc {
    padding: 35px 0;
    border-bottom: 1px solid var(--border);
}

.toc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 10px;
}

.toc-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text);
    font-size: 0.88rem;
    transition: all 0.2s;
}

.toc-item:hover {
    border-color: var(--primary);
    transform: translateX(4px);
    background: rgba(38, 77, 228, 0.1);
}

.toc-num {
    width: 26px;
    height: 26px;
    background: var(--primary);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    font-weight: 600;
    flex-shrink: 0;
}

/* === SECTIONS === */
section {
    padding: 55px 0;
    border-bottom: 1px solid var(--border);
}

.sec-header {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 30px;
}

.sec-num {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    font-weight: 600;
    flex-shrink: 0;
}

section:nth-child(odd) .sec-num { background: linear-gradient(135deg, var(--purple), #7c3aed); }
section:nth-child(3n) .sec-num { background: linear-gradient(135deg, var(--pink), #db2777); }
section:nth-child(4n) .sec-num { background: linear-gradient(135deg, var(--green), #059669); }

.sec-title {
    font-size: 1.7rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.sec-sub {
    color: var(--dim);
    font-size: 0.95rem;
}

h3 {
    font-size: 1.15rem;
    margin: 28px 0 14px;
    color: var(--accent);
}

p, li { color: var(--muted); margin-bottom: 8px; }

ul { list-style: none; padding-left: 0; }
li { padding-left: 22px; position: relative; }
li::before { content: '▸'; position: absolute; left: 0; color: var(--primary); }

/* === CODE BLOCKS === */
.code {
    background: #080c14;
    border: 1px solid var(--border);
    border-radius: 10px;
    margin: 14px 0;
    overflow: hidden;
}

.code-head {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: #0f1829;
    border-bottom: 1px solid var(--border);
    font-size: 0.78rem;
    color: var(--dim);
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.r { background: #ff5f56; }
.dot.y { background: #ffbd2e; }
.dot.g { background: #27ca40; }

pre {
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    line-height: 1.55;
    overflow-x: auto;
}

.sel { color: var(--orange); }
.prop { color: var(--accent); }
.val { color: var(--green); }
.c { color: var(--dim); }
.unit { color: var(--pink); }

/* === DEMOS === */
.demo {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 22px;
    margin: 14px 0;
}

.demo-title {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--dim);
    margin-bottom: 14px;
}

.demo-box {
    padding: 20px;
    background: var(--bg2);
    border-radius: 8px;
    margin: 8px 0;
}

/* === GRIDS === */
.grid2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.grid3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 14px;
}

/* === TIP BOX === */
.tip {
    background: rgba(16, 185, 129, 0.1);
    border-left: 3px solid var(--green);
    padding: 14px 18px;
    border-radius: 0 10px 10px 0;
    margin: 14px 0;
}
.tip strong { color: var(--green); }

.info {
    background: rgba(38, 77, 228, 0.1);
    border-left: 3px solid var(--primary);
    padding: 14px 18px;
    border-radius: 0 10px 10px 0;
    margin: 14px 0;
}
.info strong { color: var(--primary); }

/* === REFERENCE CARDS === */
.ref-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
}

.ref-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
}

.ref-card h4 {
    font-size: 0.95rem;
    color: var(--accent);
    margin-bottom: 10px;
}

.ref-card code {
    color: var(--orange);
    background: var(--bg);
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.78rem;
    margin: 2px;
    display: inline-block;
}

/* === TABLES === */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 14px 0;
    font-size: 0.88rem;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--card);
    color: var(--accent);
    font-weight: 600;
}

td { color: var(--muted); }
td code {
    color: var(--orange);
    background: var(--bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.78rem;
}

/* === FOOTER === */
footer {
    padding: 40px 0;
    text-align: center;
    color: var(--dim);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

footer strong { color: var(--muted); }

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    nav { display: none; }
    .sec-header { flex-direction: column; }
    .toc-grid { grid-template-columns: 1fr 1fr; }
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }