/* --- RESET ET BASE --- */
:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-green: #238636;
    --border: #30363d;
    --font-main: 'Inter', sans-serif;
    --font-code: 'Fira Code', 'Courier New', monospace;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    margin: 0;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- NAVIGATION BAR --- */
nav {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
}

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

.brand {
    font-weight: bold;
    color: #fff;
}

/* --- HEADERS --- */
header {
    border-bottom: 1px solid var(--border); /* Ligne sous le header */
    padding: 60px 0 40px;
    text-align: center;
    margin-bottom: 40px;
}

h1 { color: #ffffff; font-size: 2.5rem; margin: 0 0 10px 0; }
h2 { color: #ffffff; border-bottom: 2px solid var(--border); padding-bottom: 10px; margin-top: 50px; margin-bottom: 20px;}
h3 { color: #fff; margin-top: 0; }

.subtitle { font-size: 1.2rem; color: var(--accent); margin-bottom: 5px; }
.authors { color: var(--text-secondary); font-style: italic; }

/* --- CARDS & SECTIONS --- */
section { margin-bottom: 50px; }

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 20px;
}

/* --- STYLES ACCUEIL : TREE VIEW (Arborescence) --- */
.file-structure {
    background: #010409;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 20px;
    font-family: var(--font-code);
}

ul.tree, ul.tree ul { list-style-type: none; margin: 0; padding: 0; }
ul.tree ul { margin-left: 20px; border-left: 1px solid var(--border); }
ul.tree li { margin: 5px 0; padding-left: 10px; position: relative; }
ul.tree li::before {
    content: ""; position: absolute; top: 12px; left: 0;
    width: 8px; height: 1px; background: var(--border);
}
.folder { color: var(--accent); font-weight: bold; }
.file { color: var(--text-primary); }
.comment { color: var(--text-secondary); font-style: italic; font-size: 0.9em; margin-left: 10px; }

/* --- STYLES ACCUEIL : GRID ARCHITECTURE --- */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.step {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 20px;
    border-radius: 8px;
    transition: transform 0.2s;
}

.step:hover { transform: translateY(-5px); border-color: var(--accent); }
.step h3 { margin-bottom: 10px; }

/* --- STYLES CODE & LOGS --- */
pre {
    background: #000;
    padding: 15px;
    border-radius: 6px;
    overflow-x: auto;
    border: 1px solid var(--border);
    margin: 0;
}

code {
    font-family: var(--font-code);
    font-size: 0.9rem;
    color: #e6edf3;
}

.notebook-cell {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 20px;
    overflow: hidden;
}

.cell-header {
    background: #21262d;
    padding: 5px 15px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    font-family: var(--font-code);
}
.cell-content { padding: 15px; }

/* --- TABLES (Logs & Performance) --- */
table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    margin-top: 20px;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

th { background-color: #21262d; color: #fff; }
tr:hover { background-color: #21262d; }

.highlight {
    background-color: rgba(35, 134, 54, 0.1);
    border-left: 4px solid var(--accent-green);
}

.status-ok { color: var(--accent-green); font-weight: bold; }
.status-warn { color: #d29922; font-weight: bold; }

.note {
    margin-top: 15px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: rgba(88, 166, 255, 0.1);
    padding: 10px;
    border-radius: 4px;
    border-left: 3px solid var(--accent);
}

/* --- FOOTER --- */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-secondary);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 60px;
}