/* void-attractor.css — Paper 9 Voidspace Three.js demo section
   Section embedded in homepage. Styled to match opacity-field.html aesthetic.
   ─────────────────────────────────────────────────────────────────────────── */

/* ── Section container ──────────────────────────────────────────────────── */
#void-attractor {
    position: relative;
    width: 100%;
    height: 70vh;
    min-height: 500px;
    max-height: 800px;
    background: #06060a;
    overflow: hidden;
    border-top: 1px solid #1a1a1e;
    border-bottom: 1px solid #1a1a1e;
}

/* ── Canvas wrapper — fills section ─────────────────────────────────────── */
#va-canvas-wrap {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

#va-canvas-wrap canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

/* ── Text overlay — pointer-events off except buttons ───────────────────── */
.va-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 2.5rem 2rem 2rem;
}

/* ── Header block ───────────────────────────────────────────────────────── */
.va-header {
    max-width: 500px;
}

.va-paper-tag {
    display: inline-block;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #52525b;
    margin-bottom: 0.6rem;
}

.va-header h2 {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: clamp(2.8rem, 7vw, 5.5rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 1;
    color: #fafafa;
    margin-bottom: 0.5rem;
    transition: color 0.6s ease;
}

#void-attractor[data-phase="gas"] .va-header h2 { color: #7799ee; }
#void-attractor[data-phase="fluid"] .va-header h2 { color: #44bb88; }
#void-attractor[data-phase="vortex"] .va-header h2 { color: #ee3311; }

.va-header p {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.82rem;
    color: #71717a;
    line-height: 1.6;
    margin: 0;
}

/* ── Bottom group: modes + phase desc stacked ───────────────────────────── */
.va-bottom {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* ── Mode buttons ───────────────────────────────────────────────────────── */
.va-modes {
    display: flex;
    gap: 0.5rem;
    pointer-events: auto;
    flex-wrap: wrap;
}

.va-btn {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    padding: 0.55rem 1.1rem;
    border: 1px solid #27272a;
    background: rgba(6, 6, 10, 0.75);
    color: #71717a;
    cursor: pointer;
    border-radius: 5px;
    transition: all 0.2s ease;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}

.va-btn:hover {
    border-color: #3f3f46;
    color: #a1a1aa;
    background: rgba(15, 15, 20, 0.85);
}

.va-btn.va-active {
    border-color: #52525b;
    color: #fafafa;
    background: rgba(20, 20, 28, 0.9);
}

#void-attractor[data-phase="gas"] .va-btn[data-phase="gas"],
.va-btn[data-phase="gas"].va-active {
    border-color: #2255cc;
    color: #7799ee;
}

#void-attractor[data-phase="fluid"] .va-btn[data-phase="fluid"],
.va-btn[data-phase="fluid"].va-active {
    border-color: #116644;
    color: #44bb88;
}

#void-attractor[data-phase="vortex"] .va-btn[data-phase="vortex"],
.va-btn[data-phase="vortex"].va-active {
    border-color: #991122;
    color: #ee4422;
}

/* ── Drag hint ───────────────────────────────────────────────────────────── */
.va-hint {
    position: absolute;
    bottom: 1.5rem;
    right: 2rem;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.72rem;
    color: #3f3f46;
    letter-spacing: 0.08em;
    pointer-events: none;
}

/* ── Pe threshold label ─────────────────────────────────────────────────── */
.va-threshold-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: #cc8833;
    letter-spacing: 0.1em;
    opacity: 0.6;
    pointer-events: none;
}

/* ── Phase description (below buttons) ──────────────────────────────────── */
.va-phase-desc {
    margin: 0;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    color: #52525b;
    pointer-events: none;
    transition: color 0.5s ease;
    line-height: 1.5;
}

#void-attractor[data-phase="gas"] .va-phase-desc { color: #4466aa; }
#void-attractor[data-phase="fluid"] .va-phase-desc { color: #336655; }
#void-attractor[data-phase="vortex"] .va-phase-desc { color: #882211; }

/* ── Mobile ─────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    #void-attractor {
        height: 60vh;
        min-height: 420px;
    }

    .va-overlay {
        padding: 1.5rem 1.25rem 1.25rem;
    }

    .va-header h2 {
        font-size: clamp(2.2rem, 10vw, 3.5rem);
    }

    .va-header p {
        font-size: 0.75rem;
    }

    .va-btn {
        font-size: 0.72rem;
        padding: 0.45rem 0.9rem;
    }

    .va-hint { display: none; }
}