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

html, body {
    height: 100%;
    overflow: hidden;
    background: #08080d;
}

#scene {
    position: relative;
    width: 100%;
    height: 100%;
}

#scene canvas {
    display: block;
}

#legend {
    position: fixed;
    top: 24px;
    left: 24px;
    z-index: 10;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.6);
    background: rgba(8, 8, 13, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 4px;
    padding: 20px;
    width: 230px;
    line-height: 1.5;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    user-select: none;
}

.legend-heading {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 10px;
}

.toggle-section {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.toggle-section:hover {
    color: rgba(255, 255, 255, 0.6);
}

.toggle-arrow {
    font-size: 8px;
    transition: transform 0.2s;
}

.toggle-section.open .toggle-arrow {
    transform: rotate(-90deg);
}

.section-body {
    display: none;
}

.section-body.open {
    display: block;
}

.section-detail {
    margin-top: 8px;
    font-size: 10px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.3);
    border-left: 1px solid rgba(255, 255, 255, 0.08);
    padding-left: 8px;
}

.legend-note {
    font-weight: 400;
    font-style: italic;
    text-transform: none;
    letter-spacing: 0.04em;
}

.legend-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 6px;
    margin: 0 -6px;
    border-radius: 3px;
    white-space: nowrap;
    cursor: default;
    transition: background 0.2s;
}

.legend-row[data-pyramid] {
    cursor: pointer;
}

.legend-row[data-pyramid]:hover {
    background: rgba(255, 255, 255, 0.05);
}

.legend-row.small {
    white-space: normal;
    opacity: 0.5;
    line-height: 1.4;
}

.legend-desc {
    opacity: 0.35;
    margin-left: auto;
    font-size: 10px;
}

.dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
}

.dot.pulse {
    animation: dotPulse 3s ease-in-out infinite;
}

.legend-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.06);
    margin: 14px 0;
}

.ef-group {
    font-size: 9px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.3);
    margin-top: 8px;
    margin-bottom: 2px;
}

.ef-group:first-of-type {
    margin-top: 0;
}

.ef-row {
    padding: 2px 0 2px 4px;
    color: rgba(136, 136, 170, 0.8);
}

.ef-num {
    display: inline-block;
    width: 16px;
    text-align: right;
    margin-right: 6px;
    opacity: 0.5;
    font-size: 10px;
}

.eightfold-label {
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 9px;
    letter-spacing: 0.04em;
    color: rgba(136, 136, 170, 0.7);
    white-space: nowrap;
    pointer-events: none;
    user-select: none;
    opacity: 0;
    animation: efIn 0.6s ease forwards;
}

.eightfold-label .ef-3d-num {
    opacity: 0.4;
    margin-right: 4px;
}

@keyframes dotPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

@keyframes efIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(-2px); }
}

/* =========================================================================
   Scene navigation — single tab bar, bottom-center.
   Tabs always visible, active state highlighted in warm gold.
   Structure / Torus / Crystal are variants of the axial form;
   Meeting / Spawn are different scenes (separator between the groups).
   ========================================================================= */
#scene-nav {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 6px;
    background: rgba(8, 8, 13, 0.78);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 6px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.scene-tab {
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.52);
    background: transparent;
    border: 1px solid transparent;
    padding: 9px 16px;
    cursor: pointer;
    border-radius: 4px;
    transition: color 0.18s, background 0.18s, border-color 0.18s;
    white-space: nowrap;
}

.scene-tab:hover {
    color: rgba(255, 245, 220, 0.95);
    background: rgba(255, 255, 255, 0.04);
}

.scene-tab.active {
    color: rgba(255, 240, 214, 1);
    background: rgba(212, 165, 116, 0.14);
    border-color: rgba(212, 165, 116, 0.42);
}

.scene-tab-sep {
    width: 1px;
    height: 18px;
    background: rgba(255, 255, 255, 0.10);
    margin: 0 6px;
}

#hint {
    position: fixed;
    top: 28px;
    right: 28px;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.2);
    pointer-events: none;
    user-select: none;
    z-index: 10;
}

.pyramid-label {
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    display: flex;
    flex-direction: column;
    gap: 3px;
    pointer-events: none;
    user-select: none;
    white-space: nowrap;
    transform: translateX(20px);
    opacity: 0;
    animation: labelIn 1s ease forwards;
}

.pyramid-label:nth-child(1) { animation-delay: 1s; }
.pyramid-label:nth-child(2) { animation-delay: 1.3s; }
.pyramid-label:nth-child(3) { animation-delay: 1.6s; }
.pyramid-label:nth-child(4) { animation-delay: 1.9s; }

.label-name {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.label-desc {
    font-size: 10px;
    opacity: 0.45;
    letter-spacing: 0.06em;
}

.label-line {
    position: absolute;
    left: -18px;
    top: 50%;
    width: 16px;
    height: 1px;
    background: currentColor;
    opacity: 0.25;
}

@keyframes labelIn {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(20px);
    }
}