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

:root {
    --bg-deep: #0d0f1a;
    --bg-panel: rgba(13, 15, 30, 0.88);
    --bg-panel-hover: rgba(20, 24, 50, 0.9);
    --vein-color: #4a90d9;
    --vein-glow: #6db3f8;
    --nerve-color: #f5c842;
    --nerve-glow: #ffe066;
    --bone-color: #c8c8d0;
    --skin-color: #d4a574;
    --text-primary: #e8eaf0;
    --text-secondary: #8890a4;
    --text-dim: #555a6e;
    --border-color: rgba(100, 110, 140, 0.2);
    --accent: #4a90d9;
    --header-h: 56px;
    --footer-h: 28px;
    --bottom-bar-h: 50px;
}

html, body {
    font-family: 'IBM Plex Sans', system-ui, sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    overflow: hidden;
    width: 100%;
    height: 100%;
    -webkit-tap-highlight-color: transparent;
}

#scene-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

#scene-container canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

/* ===== HEADER ===== */
#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 20px;
    height: var(--header-h);
    display: flex;
    align-items: center;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.title-group h1 {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 17px;
    font-weight: 600;
    letter-spacing: 1px;
    background: linear-gradient(135deg, var(--vein-color), var(--nerve-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.subtitle {
    font-size: 10px;
    color: var(--text-secondary);
    font-weight: 200;
    letter-spacing: 2px;
    text-transform: uppercase;
    display: block;
}

.header-icon {
    font-size: 26px;
    filter: grayscale(0.3);
    flex-shrink: 0;
}

/* ===== PANELS ===== */
.panel {
    position: fixed;
    top: calc(var(--header-h) + 8px);
    z-index: 90;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    max-height: calc(100vh - var(--header-h) - var(--bottom-bar-h) - var(--footer-h) - 30px);
    overflow-y: auto;
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s;
    -webkit-overflow-scrolling: touch;
}

.panel::-webkit-scrollbar {
    width: 3px;
}
.panel::-webkit-scrollbar-thumb {
    background: var(--text-dim);
    border-radius: 2px;
}

/* Left panel */
#left-panel {
    left: 8px;
    width: 200px;
    border-radius: 12px;
    padding: 14px;
}

#left-panel.collapsed {
    transform: translateX(-220px);
}

.panel-toggle {
    position: absolute;
    top: 8px;
    right: -30px;
    width: 28px;
    height: 32px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s;
    z-index: 91;
}

.panel-toggle:hover {
    background: var(--bg-panel-hover);
    color: var(--text-primary);
}

/* Right panel */
#right-panel {
    right: 8px;
    width: 250px;
    border-radius: 12px;
    padding: 14px;
    padding-top: 8px;
    position: relative;
}

#right-panel.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateX(20px);
}

.close-panel-btn {
    position: absolute;
    top: 6px;
    right: 10px;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    line-height: 1;
    z-index: 2;
    transition: color 0.2s;
}
.close-panel-btn:hover {
    color: var(--text-primary);
}

.panel h2 {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    margin-top: 14px;
}

.panel h2:first-child {
    margin-top: 0;
}

/* Toggle items */
.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.toggle-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 8px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: background 0.2s;
    user-select: none;
    min-height: 36px;
}

.toggle-item:hover {
    background: rgba(255,255,255,0.04);
}

.toggle-item input[type="checkbox"] {
    display: none;
}

.toggle-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid var(--text-dim);
    transition: all 0.3s;
    flex-shrink: 0;
}

.toggle-item input:checked ~ .vein-dot {
    background: var(--vein-color);
    border-color: var(--vein-color);
    box-shadow: 0 0 8px var(--vein-color);
}
.toggle-item input:checked ~ .nerve-dot {
    background: var(--nerve-color);
    border-color: var(--nerve-color);
    box-shadow: 0 0 8px var(--nerve-color);
}
.toggle-item input:checked ~ .skin-dot {
    background: var(--skin-color);
    border-color: var(--skin-color);
}
.toggle-item input:checked ~ .bone-dot {
    background: var(--bone-color);
    border-color: var(--bone-color);
}
.toggle-item input:checked ~ .pulse-dot {
    background: #e74c3c;
    border-color: #e74c3c;
    box-shadow: 0 0 6px #e74c3c;
}
.toggle-item input:checked ~ .signal-dot {
    background: var(--nerve-glow);
    border-color: var(--nerve-glow);
    box-shadow: 0 0 6px var(--nerve-glow);
}

/* Preset buttons */
.preset-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5px;
}

.preset-btn {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 4px;
    border-radius: 6px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    cursor: pointer;
    transition: all 0.25s;
    text-transform: uppercase;
    letter-spacing: 1px;
    min-height: 36px;
}

.preset-btn:hover, .preset-btn:active {
    background: rgba(74, 144, 217, 0.15);
    border-color: var(--vein-color);
    color: var(--text-primary);
}

.preset-btn:last-child {
    grid-column: 1 / -1;
}

/* Info panel content */
.info-icon {
    font-size: 28px;
    margin-bottom: 6px;
    opacity: 0.4;
}

#info-placeholder, #mobile-info-placeholder {
    text-align: center;
    padding: 16px 0;
    color: var(--text-dim);
    font-size: 12px;
}

#info-content h2, #mobile-info-content h2 {
    font-size: 14px;
    color: var(--text-primary);
    text-transform: none;
    letter-spacing: 0;
}

.info-type {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 2px;
    padding: 3px 8px;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 10px;
}

.info-type.vein-type {
    background: rgba(74, 144, 217, 0.15);
    color: var(--vein-color);
    border: 1px solid rgba(74, 144, 217, 0.3);
}

.info-type.nerve-type {
    background: rgba(245, 200, 66, 0.15);
    color: var(--nerve-color);
    border: 1px solid rgba(245, 200, 66, 0.3);
}

.info-section {
    margin-top: 10px;
}

.info-section h3 {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 9px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 3px;
}

.info-section p {
    font-size: 12px;
    line-height: 1.55;
    color: var(--text-secondary);
}

/* ===== BOTTOM BAR ===== */
#bottom-bar {
    position: fixed;
    bottom: calc(var(--footer-h) + 6px);
    left: 50%;
    transform: translateX(-50%);
    z-index: 90;
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 6px 12px;
    max-width: calc(100vw - 16px);
}

.bar-group {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.bar-buttons {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: nowrap;
}

.bar-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 9px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

#zoom-slider {
    width: 70px;
    accent-color: var(--vein-color);
    height: 4px;
    flex-shrink: 0;
}

.bar-btn {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 10px;
    border-radius: 6px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    cursor: pointer;
    transition: all 0.25s;
    white-space: nowrap;
    min-height: 32px;
    flex-shrink: 0;
}

.bar-btn:hover, .bar-btn:active {
    background: rgba(74, 144, 217, 0.12);
    border-color: var(--accent);
    color: var(--text-primary);
}

.bar-btn.active {
    background: rgba(74, 144, 217, 0.2);
    border-color: var(--accent);
    color: var(--vein-color);
}

/* ===== FOOTER ===== */
#footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 80;
    text-align: center;
    padding: 6px 8px;
    font-size: 9px;
    color: var(--text-dim);
    background: rgba(13, 15, 30, 0.7);
    display: flex;
    justify-content: center;
    gap: 12px;
    height: var(--footer-h);
    align-items: center;
}

#footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

#footer a:hover {
    color: var(--vein-color);
}

/* ===== MOBILE DRAWER ===== */
.mobile-drawer {
    display: none;
}

/* ===== MOBILE RESPONSIVE ===== */
@media (max-width: 768px) {
    :root {
        --header-h: 48px;
    }

    .title-group h1 {
        font-size: 14px;
    }

    .subtitle {
        font-size: 8px;
        letter-spacing: 1.5px;
    }

    .header-icon {
        font-size: 22px;
    }

    #left-panel {
        width: 170px;
        padding: 10px;
        left: 6px;
    }

    .toggle-item {
        font-size: 12px;
        padding: 6px 6px;
        min-height: 34px;
    }

    .preset-btn {
        font-size: 9px;
        padding: 7px 3px;
        min-height: 34px;
    }

    /* Hide desktop right panel on mobile */
    #right-panel {
        display: none !important;
    }

    /* Show mobile drawer */
    .mobile-drawer {
        display: block;
        position: fixed;
        bottom: calc(var(--footer-h) + var(--bottom-bar-h) + 12px);
        left: 8px;
        right: 8px;
        z-index: 95;
        background: var(--bg-panel);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        padding: 10px 14px 14px;
        max-height: 40vh;
        overflow-y: auto;
        transition: transform 0.3s ease, opacity 0.3s ease;
    }

    .mobile-drawer.hidden {
        transform: translateY(20px);
        opacity: 0;
        pointer-events: none;
    }

    .drawer-handle {
        width: 32px;
        height: 3px;
        background: var(--text-dim);
        border-radius: 2px;
        margin: 0 auto 8px;
    }

    .drawer-content h2 {
        font-family: 'IBM Plex Mono', monospace;
        font-size: 13px;
        color: var(--text-primary);
        margin-bottom: 4px;
    }

    /* Bottom bar mobile */
    #bottom-bar {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 4px;
        padding: 5px 8px;
        bottom: calc(var(--footer-h) + 4px);
    }

    .bar-group {
        width: 100%;
        justify-content: center;
    }

    #zoom-slider {
        width: 50%;
        min-width: 80px;
    }

    .bar-buttons {
        flex-wrap: wrap;
        justify-content: center;
        gap: 3px;
    }

    .bar-btn {
        padding: 5px 8px;
        font-size: 9px;
        min-height: 30px;
    }
}

@media (max-width: 400px) {
    #left-panel {
        width: 155px;
    }

    .header-icon {
        display: none;
    }

    .title-group h1 {
        font-size: 13px;
    }
}