/* ── Color palette ── */
:root {
    --bg: #0a0a0f;
    --bg-card: #111118;
    --bg-inset: #0d0d14;
    --border: #222233;
    --text: #c0c0c0;
    --text-secondary: #b0b0b0;
    --text-muted: #888;
    --text-dim: #666;
    --accent: #00ffd5;
    --accent-green: #00ff88;
    --accent-orange: #ff8800;
    --accent-red: #ff3366;
    --font: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Base ── */
body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    min-height: 100vh;
    line-height: 1.6;
}

/* ── Utility classes ── */
.code { color: var(--accent); }
.green { color: var(--accent-green); }
.orange { color: var(--accent-orange); }

/* ── Primary button ── */
.btn {
    display: block;
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #00ffd5 0%, #00cc99 100%);
    color: var(--bg);
    border: none;
    border-radius: 6px;
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}

.btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 255, 213, 0.3);
}

.btn:disabled { opacity: 0.65; cursor: not-allowed; }

/* ── Delay diagram (shared by explainer + view) ── */
.delay-diagram {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    margin: 12px 0;
    padding: 12px;
    background: var(--bg);
    border-radius: 4px;
    height: 70px;
}

.delay-bar {
    width: 18px;
    border-radius: 2px 2px 0 0;
    text-align: center;
    font-size: 0.65rem;
    color: var(--bg);
    font-weight: bold;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 2px;
}

.delay-label {
    font-size: 0.7rem;
    margin-left: 12px;
    color: var(--text-dim);
    align-self: center;
}

/* ── Animation ── */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeIn 0.3s ease-out; }