/* RIFF — rock · indie · punk · grunge · americana
   Habit sombre par défaut : rouge brique sur encre, titres capitales, angles nets. */

[data-theme="riff"] {
    --th-bg: #12100f;
    --th-surface: #1a1715;
    --th-surface-2: #221d1a;
    --th-border: #332b26;
    --th-text: #e6ded6;
    --th-muted: #93857a;
    --th-accent: #e8543f;
    --th-accent-2: #f0a03c;
    --th-title-font: 'Share Tech Mono', ui-monospace, monospace;
    --th-body-font: 'Inter', system-ui, sans-serif;
    --th-radius: 2px;
    --th-tracking: 2.5px;
}

[data-theme="riff"][data-variant="light"] {
    --th-bg: #f6f2ec;
    --th-surface: #ffffff;
    --th-surface-2: #efe7dc;
    --th-border: #d9cbbd;
    --th-text: #241d18;
    --th-muted: #7b6a5c;
    --th-accent: #c8391f;
    --th-accent-2: #b5761a;
}

/* Signature : titres capitales, bandeau d'encre, filet épais. */
[data-theme="riff"] h1,
[data-theme="riff"] h2,
[data-theme="riff"] .theme-title {
    text-transform: uppercase;
    font-weight: 400;
}

[data-theme="riff"] .theme-rule {
    height: 4px;
    background: repeating-linear-gradient(135deg, var(--th-accent) 0 8px, transparent 8px 14px);
}

[data-theme="riff"] .theme-card,
[data-theme="riff"] .card {
    border-left: 3px solid var(--th-accent);
}