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

:root {
    --bg-primary: #0b0f14;
    --bg-secondary: #101622;
    --bg-tertiary: #161d2a;
    --glass: rgba(15, 20, 28, 0.75);
    --accent: #1ef2b2;
    --accent-dim: rgba(30, 242, 178, 0.18);
    --accent-2: #4dd9ff;
    --text-primary: #eef2f7;
    --text-secondary: #9aa4b2;
    --text-tertiary: #6b7280;
    --border: #1f2937;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

body {
    font-family: 'Space Grotesk', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    overscroll-behavior: none;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(70% 50% at 15% 10%, rgba(30, 242, 178, 0.08), transparent 60%),
        radial-gradient(60% 60% at 85% 15%, rgba(77, 217, 255, 0.08), transparent 60%),
        radial-gradient(40% 40% at 50% 80%, rgba(255, 255, 255, 0.04), transparent 60%);
    pointer-events: none;
    z-index: 0;
}

#canvas-container {
    position: fixed;
    inset: 0;
    z-index: 0;
    touch-action: none;
    user-select: none;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none;
}

.top-bar {
    position: fixed;
    top: calc(16px + env(safe-area-inset-top));
    left: calc(16px + env(safe-area-inset-left));
    right: calc(16px + env(safe-area-inset-right));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    z-index: 120;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    width: 34px;
    height: 34px;
    background: var(--accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(30, 242, 178, 0.3);
}

.brand-icon svg {
    width: 20px;
    height: 20px;
    fill: #0b0f14;
}

.brand-text {
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.4px;
}

.brand-text span {
    color: var(--accent);
}

.mesh-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mesh-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.4px;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-dim);
}

.icon-btn svg {
    width: 18px;
    height: 18px;
}

.side-panel {
    position: fixed;
    top: 84px;
    right: 16px;
    width: 330px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
    z-index: 110;
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.3s ease;
    pointer-events: none;
    max-height: calc(100vh - 120px);
    overflow: auto;
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
}

.side-panel.visible {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}

.side-panel.visible.collapsed {
    opacity: 0;
    transform: translateX(120%);
    pointer-events: none;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 12px;
}

.panel-title {
    font-size: 14px;
    font-weight: 600;
}

.panel-subtitle {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.panel-section {
    padding: 12px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.panel-section:first-of-type {
    border-top: none;
    padding-top: 4px;
}

.panel-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.stat {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 10px;
    padding: 8px;
}

.stat-label {
    font-size: 10px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 4px;
}

.stat-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent);
}

.panel-value {
    font-size: 13px;
    color: var(--text-primary);
}

.panel-value.accent {
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

.panel-value.small {
    font-size: 11px;
    color: var(--text-secondary);
}

.controls-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.controls-stack {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-btn {
    padding: 10px 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    text-align: center;
}

.control-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.control-btn.active {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}

.control-btn svg {
    width: 16px;
    height: 16px;
}

.control-btn span {
    font-size: 10px;
    letter-spacing: 0.6px;
    text-transform: uppercase;
}

.control-btn.wide {
    width: 100%;
    flex-direction: row;
    font-weight: 500;
}

.toggle-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px 0;
}

.toggle-row input {
    accent-color: var(--accent);
    width: 14px;
    height: 14px;
}

.control-group {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    padding: 10px 12px;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.control-label-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 11px;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
    height: 24px;
    display: flex;
    align-items: center;
    margin: 6px 0;
}

input[type=range]:focus {
    outline: none;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: var(--bg-tertiary);
    border-radius: 2px;
    border: 1px solid var(--border);
}

input[type=range]::-webkit-slider-thumb {
    height: 14px;
    width: 14px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
    box-shadow: 0 0 0 2px var(--bg-secondary);
    transition: transform 0.1s ease;
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

input[type=range]::-moz-range-track {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    border: 1px solid var(--border);
}

input[type=range]::-moz-range-thumb {
    height: 14px;
    width: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: none;
}

.shortcut-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
}

.shortcut {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    color: var(--text-secondary);
}

.shortcut kbd {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.bottom-bar {
    position: fixed;
    bottom: calc(16px + env(safe-area-inset-bottom));
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    padding: 8px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 14px;
    z-index: 110;
    opacity: 0;
    transition: all 0.3s ease;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
}

.bottom-bar.visible {
    opacity: 1;
}

.bottom-btn {
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    position: relative;
}

.bottom-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.bottom-btn.active {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}

.bottom-btn svg {
    width: 18px;
    height: 18px;
}

.bottom-btn::after {
    content: attr(data-label);
    position: absolute;
    bottom: 54px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 8px;
    font-size: 10px;
    color: var(--text-secondary);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    white-space: nowrap;
}

.bottom-btn:hover::after {
    opacity: 1;
}

.info-overlay {
    position: fixed;
    bottom: calc(16px + env(safe-area-inset-bottom));
    left: calc(16px + env(safe-area-inset-left));
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-tertiary);
    z-index: 110;
    opacity: 0;
    transition: opacity 0.3s ease;
    line-height: 1.6;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 10px;
    backdrop-filter: blur(8px);
}

.info-overlay.visible {
    opacity: 1;
}

.help-hint {
    position: fixed;
    bottom: calc(86px + env(safe-area-inset-bottom));
    left: 50%;
    transform: translateX(-50%);
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 16px;
    font-size: 11px;
    color: var(--text-secondary);
    z-index: 110;
    opacity: 0;
    transition: opacity 0.3s ease;
    display: grid;
    place-items: center;
    backdrop-filter: blur(10px);
}

.help-hint.visible {
    opacity: 1;
}

.help-hint > div {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

.help-hint .hint-touch {
    display: none;
}

.help-hint kbd {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.loading-screen {
    position: fixed;
    inset: 0;
    background: radial-gradient(circle at top, rgba(30, 242, 178, 0.08), transparent 60%), var(--bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 300;
    transition: opacity 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-logo {
    width: 88px;
    height: 88px;
    background: var(--accent);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 28px;
    animation: pulse 2s ease-in-out infinite;
    box-shadow: 0 20px 40px rgba(30, 242, 178, 0.35);
}

.loading-logo svg {
    width: 48px;
    height: 48px;
    fill: #0b0f14;
}

@keyframes pulse {
    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.05);
        opacity: 0.85;
    }
}

.loading-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.loading-title span {
    color: var(--accent);
}

.loading-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.progress-container {
    width: 320px;
    margin-bottom: 16px;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-tertiary);
}

.loading-status {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent);
    margin-top: 16px;
}

.loading-tip {
    position: absolute;
    bottom: 28px;
    font-size: 12px;
    color: var(--text-tertiary);
    text-align: center;
    max-width: 360px;
}

.error-screen {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 400;
    text-align: center;
    padding: 24px;
}

.error-screen.visible {
    display: flex;
}

.error-icon {
    font-size: 52px;
    color: var(--accent);
    margin-bottom: 12px;
    font-weight: 700;
}

.error-title {
    font-size: 20px;
    margin-bottom: 8px;
}

.error-message {
    color: var(--text-secondary);
    font-size: 14px;
    max-width: 420px;
}

.retry-btn {
    margin-top: 20px;
    padding: 12px 24px;
    background: var(--accent);
    color: #081012;
    border: none;
    border-radius: 10px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(30, 242, 178, 0.25);
}

@media (max-width: 1100px) {
    .side-panel {
        width: 300px;
    }

    .help-hint {
        padding: 8px 12px;
    }

    .help-hint > div {
        gap: 8px;
    }
}

@media (max-width: 900px) {
    .top-bar {
        top: calc(12px + env(safe-area-inset-top));
        left: calc(12px + env(safe-area-inset-left));
        right: calc(12px + env(safe-area-inset-right));
    }

    .side-panel {
        left: 12px;
        right: 12px;
        top: auto;
        bottom: 88px;
        width: auto;
        max-height: 55vh;
        border-radius: 18px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .bottom-bar {
        left: 12px;
        right: 12px;
        transform: none;
        width: auto;
        justify-content: center;
        gap: 6px;
        padding: 6px;
    }

    .bottom-btn {
        width: 40px;
        height: 40px;
    }

    .help-hint {
        bottom: calc(76px + env(safe-area-inset-bottom));
        left: 12px;
        right: 12px;
        transform: none;
        padding: 8px 12px;
    }

    .help-hint > div {
        gap: 6px;
    }

    .help-hint kbd {
        padding: 2px 5px;
        font-size: 9px;
    }

    .info-overlay {
        bottom: calc(76px + env(safe-area-inset-bottom));
        font-size: 9px;
        padding: 6px 8px;
    }
}

@media (max-width: 600px) {
    .top-bar {
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 8px;
    }

    .brand-text {
        font-size: 13px;
    }

    .mesh-actions {
        width: auto;
        justify-content: flex-end;
    }

    .mesh-name {
        font-size: 13px;
    }

    .shortcut-grid {
        grid-template-columns: 1fr;
    }

    .progress-container {
        width: 260px;
    }

    .bottom-bar {
        gap: 4px;
        padding: 5px;
    }

    .bottom-btn {
        width: 38px;
        height: 38px;
        border-radius: 8px;
    }

    .bottom-btn svg {
        width: 16px;
        height: 16px;
    }

    .help-hint {
        display: none;
    }

    .info-overlay {
        bottom: calc(66px + env(safe-area-inset-bottom));
        left: 8px;
    }
}

@media (max-width: 400px) {
    .top-bar {
        left: 8px;
        right: 8px;
        top: 8px;
    }

    .brand-icon {
        width: 30px;
        height: 30px;
    }

    .brand-text {
        font-size: 12px;
    }

    .icon-btn {
        width: 32px;
        height: 32px;
    }

    .bottom-bar {
        left: 8px;
        right: 8px;
        bottom: calc(8px + env(safe-area-inset-bottom));
    }

    .bottom-btn {
        width: 36px;
        height: 36px;
    }

    .info-overlay {
        left: 8px;
        bottom: calc(60px + env(safe-area-inset-bottom));
    }
}

@media (hover: none) and (pointer: coarse) {
    .icon-btn {
        width: 44px;
        height: 44px;
        border-radius: 12px;
    }

    .control-btn {
        padding: 12px 10px;
        font-size: 12px;
    }

    .bottom-btn {
        width: 48px;
        height: 48px;
        border-radius: 12px;
    }

    .bottom-btn::after {
        display: none;
    }

    .help-hint {
        display: none;
    }

    .help-hint .hint-desktop {
        display: none;
    }

    .help-hint .hint-touch {
        display: flex;
    }

    .side-panel {
        max-height: 60vh;
    }

    .info-overlay {
        font-size: 9px;
        padding: 6px 8px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}