:root {
    --bg-dark: #1a1a2e;
    --bg-card: #16213e;
    --accent: #8b5cf6;
    --accent-dim: rgba(139, 92, 246, 0.1);
    --text-primary: #eeeeee;
    --text-secondary: #a8a8a8;
    --code-bg: #0f1419;
    --border: rgba(139, 92, 246, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.header {
    margin-bottom: 3rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: 2rem;
}

.breadcrumb {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.breadcrumb span {
    color: var(--accent);
}

h1 {
    font-family: 'Merriweather', serif;
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.level-badge {
    display: inline-block;
    background: var(--accent-dim);
    color: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--accent);
}

.section {
    background: var(--bg-card);
    padding: 2rem;
    margin: 2rem 0;
    border-radius: 10px;
    border-left: 4px solid var(--accent);
}

h2 {
    font-family: 'Merriweather', serif;
    font-size: 1.8rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin: 1.5rem 0 1rem 0;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.example-box {
    background: var(--code-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.example-box .english {
    color: #8b5cf6;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.example-box .french {
    color: var(--text-secondary);
    font-style: italic;
}

.vocab-table {
    width: 100%;
    margin: 1rem 0;
    border-collapse: collapse;
}

.vocab-table th {
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent);
    padding: 0.75rem;
    text-align: left;
    border-bottom: 2px solid var(--accent);
}

.vocab-table td {
    padding: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.vocab-table td:first-child {
    color: #8b5cf6;
    font-weight: 500;
}

.tip {
    background: rgba(139, 92, 246, 0.05);
    border-left: 3px solid var(--accent);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

.tip strong {
    color: var(--accent);
}

ul, ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

.navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border);
}

.nav-button {
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-button:hover {
    background: var(--accent);
    color: var(--bg-dark);
    transform: translateY(-2px);
}

strong {
    color: var(--text-primary);
}

code {
    background: var(--code-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    .container { padding: 2rem 1rem; }
    .navigation { flex-direction: column; gap: 1rem; }
}