:root {
    --color-bg-dark: #111317;
    --color-bg-panel: #1b1f27;
    --color-bg-input: #232835;
    --color-text-primary: #e6e7ea;
    --color-text-secondary: #b7bcc8;
    --color-text-muted: #6b7280;
    --color-accent: #4f7ad8;
    --color-accent-light: #6089e2;
    --color-secondary: #6f7688;
    --color-secondary-dark: #5f6678;
    --color-border: #2b3140;
    --color-border-light: #3a4253;
    --color-success: #4ade80;
    --color-warning: #fbbf24;

    --font-family: 'Segoe UI', Tahoma, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;

    --transition-fast: 150ms cubic-bezier(0.23, 1, 0.320, 1);
    --transition-base: 250ms cubic-bezier(0.23, 1, 0.320, 1);
    --transition-slow: 400ms cubic-bezier(0.23, 1, 0.320, 1);

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    --panel-width: clamp(200px, 22vw, 290px);
    --panel-offset: 12px;
    --handle-gap: 6px;
    --canvas-left-gutter: 0px;
    --canvas-right-gutter: 0px;
}

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

html {
    font-size: 16px;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-dark);
    color: var(--color-text-primary);
    overflow: hidden;
    height: 100vh;
    height: 100dvh;
    position: relative;
    width: 100%;
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}


:-webkit-full-screen {
    width: 100vw !important;
    height: 100vh !important;
    height: 100dvh !important;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
}

:-moz-full-screen {
    width: 100vw !important;
    height: 100vh !important;
    height: 100dvh !important;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
}

:fullscreen {
    width: 100vw !important;
    height: 100vh !important;
    height: 100dvh !important;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
}

:-webkit-full-screen #canvas,
:-moz-full-screen #canvas,
:fullscreen #canvas {
    width: auto !important;
    height: 100% !important;
    position: fixed !important;
    left: var(--canvas-left-gutter) !important;
    right: var(--canvas-right-gutter) !important;
    z-index: 1 !important;
}

:-webkit-full-screen .ui-panel,
:-moz-full-screen .ui-panel,
:fullscreen .ui-panel {
    position: fixed !important;
    left: 0 !important;
    top: 0 !important;
    width: var(--panel-width) !important;
    height: 100vh !important;
    height: 100dvh !important;
    z-index: 100 !important;
    border-radius: 0 !important;
}

:-webkit-full-screen .ui-panel-right,
:-moz-full-screen .ui-panel-right,
:fullscreen .ui-panel-right {
    left: auto !important;
    right: 0 !important;
}


#canvas {
    display: block;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
}

.ui-panel.collapsed {
    transform: translateX(calc(-100% - 20px));
    opacity: 0.98;
}

.ui-panel {
    transition: transform 420ms cubic-bezier(0.22, 1.3, 0.32, 1), opacity 220ms ease;
}

.tray-handle {
    position: fixed;
    left: calc(var(--panel-offset) + var(--panel-width) + var(--handle-gap));
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 62px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    border: 1px solid var(--color-border-light);
    background: #1f2430;
    color: var(--color-text-primary);
    cursor: pointer;
    z-index: 145;
    font-size: 1rem;
    line-height: 1;
    transition: left 420ms cubic-bezier(0.22, 1.3, 0.32, 1), right 420ms cubic-bezier(0.22, 1.3, 0.32, 1), background 160ms ease, transform 120ms ease;
}

.ui-panel:not(.ui-panel-right).collapsed + .tray-handle {
    left: 8px;
}

.tray-handle-right {
    left: auto;
    right: calc(var(--panel-offset) + var(--panel-width) + var(--handle-gap));
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.ui-panel-right.collapsed + .tray-handle-right {
    right: 8px;
}

.tray-handle:hover {
    background: #2a3140;
}

.tray-handle:active {
    transform: translateY(-50%) scale(0.96);
}


.ui-panel {
    position: fixed;
    top: var(--panel-offset);
    left: var(--panel-offset);
    width: var(--panel-width);
    max-height: calc(100vh - (var(--panel-offset) * 2));
    background: var(--color-bg-panel);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: 10px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.28);
    z-index: 100;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border-light) transparent;
}

.ui-panel-right {
    left: auto;
    right: var(--panel-offset);
}

.ui-panel-right.collapsed {
    transform: translateX(calc(100% + 20px));
}

.ui-panel::-webkit-scrollbar {
    width: 6px;
}

.ui-panel::-webkit-scrollbar-track {
    background: transparent;
}

.ui-panel::-webkit-scrollbar-thumb {
    background: var(--color-border-light);
    border-radius: 3px;
    transition: background var(--transition-fast);
}

.ui-panel::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}


.camera-panel {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 280px;
    max-height: calc(100vh - 2 * var(--spacing-lg));
    background: linear-gradient(135deg, rgba(15, 19, 34, 0.98) 0%, rgba(16, 25, 42, 0.95) 100%);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    z-index: 100;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border-light) transparent;
}

.camera-panel::-webkit-scrollbar {
    width: 6px;
}

.camera-panel::-webkit-scrollbar-track {
    background: transparent;
}

.camera-panel::-webkit-scrollbar-thumb {
    background: var(--color-border-light);
    border-radius: 3px;
    transition: background var(--transition-fast);
}

.camera-panel::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}



.camera-panel-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.camera-panel .control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.camera-panel .slider {
    flex: 1;
}

.camera-panel [id^="display-"] {
    font-size: 0.8rem;
    color: var(--color-accent);
    font-weight: 600;
    min-width: 25px;
    text-align: right;
}


.ui-header {
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}

.ui-header h1 {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.ui-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-weight: 400;
}


.ui-section {
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
}

.ui-section-last {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.ui-section-title {
    font-size: 0.86rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.ui-section-title::before {
    content: none;
}


.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
    max-width: none;
    margin: 0 0 10px 0;
    gap: 6px;
}

.button-grid .btn {
    width: 100%;
}

.btn {
    padding: 8px 10px;
    border: 1px solid;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: #2f5fbf;
    color: #fff;
    border-color: #2f5fbf;
}

.btn-primary:hover {
    background-color: #3c6cc8;
    border-color: #3c6cc8;
    box-shadow: none;
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: #2a3140;
    color: #d8dbe2;
    border-color: #3b4355;
}

.btn-secondary:hover {
    background-color: #343d51;
    box-shadow: none;
    transform: translateY(-2px);
}

.btn-accent {
    background-color: #c84e3a;
    color: #fff;
    border-color: #c84e3a;
    font-weight: 700;
}

.btn-accent:hover {
    background-color: #d85d48;
    border-color: #d85d48;
    box-shadow: none;
    transform: translateY(-2px);
}


.control-group {
    width: 100%;
    max-width: none;
    margin: 0 0 10px 0;
}

.control-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
    text-align: left;
}

.slider {
    width: 100%;
    height: 5px;
    border-radius: 3px;
    background: var(--color-bg-input);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    margin-bottom: var(--spacing-xs);
    position: relative;
    border: 1px solid var(--color-border);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(255, 107, 53, 0.4);
    transition: all var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    width: 16px;
    height: 16px;
    box-shadow: 0 0 15px rgba(255, 107, 53, 0.6);
}

.slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px rgba(255, 107, 53, 0.4);
    transition: all var(--transition-fast);
}

.slider::-moz-range-thumb:hover {
    width: 16px;
    height: 16px;
    box-shadow: 0 0 15px rgba(255, 107, 53, 0.6);
}

.number-input {
    width: 100%;
    max-width: none;
    margin-left: 0;
    display: block;
    padding: 7px 9px;
    background-color: var(--color-bg-input);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    font-family: var(--font-mono);
    transition: all var(--transition-fast);
}

.number-input:hover {
    border-color: var(--color-accent);
    background-color: rgba(255, 107, 53, 0.05);
}

.number-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 10px rgba(255, 107, 53, 0.3);
}

.value-display {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    font-weight: 500;
    display: block;
}


.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

.checkbox-label:hover {
    color: var(--color-accent);
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-accent);
}


.stats-box {
    background-color: rgba(16, 25, 42, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 8px;
    font-size: 0.85rem;
}

#btn-drop-nuke,
#btn-toggle-destroy,
#btn-clear-all {
    width: 100% !important;
    max-width: none;
    margin-left: 0 !important;
    margin-right: 0 !important;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--color-border);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-label {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.stat-value {
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-weight: 600;
}


.help-box {
    background-color: rgba(0, 212, 255, 0.05);
    border-left: 3px solid var(--color-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.help-box strong {
    color: var(--color-secondary);
    font-weight: 600;
    display: block;
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.help-box strong:first-child {
    margin-top: 0;
}

.help-box ul {
    list-style: none;
    padding-left: var(--spacing-md);
    margin: var(--spacing-xs) 0;
}

.help-box li {
    position: relative;
    margin-bottom: var(--spacing-xs);
}

.help-box li::before {
    content: '▸';
    position: absolute;
    left: -var(--spacing-md);
    color: var(--color-secondary);
}

.rotate-overlay {
    display: none;
}

.rotate-card {
    width: min(92vw, 420px);
    padding: 20px 18px;
    border-radius: 14px;
    border: 1px solid rgba(176, 194, 222, 0.28);
    background: rgba(20, 29, 45, 0.94);
    box-shadow: 0 16px 34px rgba(6, 10, 17, 0.42);
}

.rotate-title {
    color: #d3dded;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    text-align: center;
    margin-bottom: 8px;
    font-weight: 600;
}

.rotate-text {
    color: #f0bc8c;
    font-weight: 700;
    font-size: 1.1rem;
    text-align: center;
    padding: 4px 6px 8px;
}

.rotate-subtext {
    color: #bdc9de;
    font-size: 0.88rem;
    text-align: center;
    line-height: 1.4;
}


@media (max-width: 1024px) {
    :root {
        --panel-width: clamp(180px, 26vw, 240px);
        --panel-offset: 10px;
    }

    .ui-panel {
        width: var(--panel-width);
    }

    .tray-handle {
        left: calc(var(--panel-offset) + var(--panel-width) + var(--handle-gap));
    }

    .tray-handle-right {
        right: calc(var(--panel-offset) + var(--panel-width) + var(--handle-gap));
        left: auto;
    }
}

@media (pointer: coarse) and (orientation: landscape) {
    :root {
        --panel-width: clamp(160px, 31vw, 224px);
        --panel-offset: 6px;
        --handle-gap: 5px;
        --canvas-left-gutter: 0px;
        --canvas-right-gutter: 0px;
    }

    .ui-panel {
        top: var(--panel-offset);
        max-height: calc(100vh - 12px);
        padding: 7px;
    }

    .ui-header {
        margin-bottom: 6px;
        padding-bottom: 5px;
    }

    .ui-header h1 {
        font-size: 0.96rem;
    }

    .ui-subtitle {
        display: none;
    }

    .ui-section {
        margin-bottom: 6px;
        padding-bottom: 6px;
    }

    .ui-section-title {
        font-size: 0.72rem;
        margin-bottom: 5px;
    }

    .button-grid {
        gap: 4px;
        margin-bottom: 6px;
    }

    .btn {
        min-height: 28px;
        padding: 4px 6px;
        font-size: 0.7rem;
    }

    .control-group {
        margin-bottom: 6px;
    }

    .control-label {
        font-size: 0.68rem;
        margin-bottom: 3px;
    }

    .number-input {
        min-height: 28px;
        padding: 4px 6px;
        font-size: 0.76rem;
    }

    .stats-box {
        padding: 6px;
        font-size: 0.72rem;
    }

    .tray-handle {
        width: 24px;
        height: 50px;
        font-size: 0.9rem;
    }

    .tray-handle-right {
        left: auto;
    }

    #canvas {
        left: var(--canvas-left-gutter);
        right: var(--canvas-right-gutter);
        width: 100%;
    }
}

@media (orientation: landscape) and (max-height: 500px) {
    :root {
        --canvas-left-gutter: 0px;
        --canvas-right-gutter: 0px;
    }

    .tray-handle:not(.tray-handle-right) {
        left: calc(var(--panel-width) + var(--handle-gap));
        width: 26px;
        height: 54px;
        font-size: 0.9rem;
    }

    .tray-handle-right {
        right: calc(var(--panel-width) + var(--handle-gap));
        left: auto;
        width: 26px;
        height: 54px;
        font-size: 0.9rem;
    }

    .ui-panel:not(.ui-panel-right).collapsed + .tray-handle {
        left: 6px;
    }

    .ui-panel-right.collapsed + .tray-handle-right {
        right: 6px;
    }

    .ui-panel {
        width: var(--panel-width);
        left: 0;
        top: 0;
        right: auto;
        bottom: 0;
        border-radius: 0;
        max-height: 100vh;
        padding: var(--spacing-xs);
        border: none;
        border-right: 1px solid var(--color-border);
        overflow-y: auto;
    }

    .ui-panel-right {
        left: auto;
        right: 0;
        border-right: none;
        border-left: 1px solid var(--color-border);
    }

    .camera-panel {
        display: none;
    }

    #canvas {
        position: absolute;
        left: 0;
        right: 0;
        top: 0;
        width: 100%;
        height: 100%;
    }

    .button-grid {
        width: 100%;
        max-width: none;
        margin: 0 0 4px 0;
        grid-template-columns: 1fr 1fr;
        gap: 2px;
    }

    .ui-header {
        margin-bottom: 4px;
        padding-bottom: 4px;
    }

    .ui-header h1 {
        font-size: 0.95rem;
    }

    .ui-header p {
        display: none;
    }

    .ui-section {
        margin-bottom: 4px;
        padding-bottom: 4px;
        border-bottom: 1px solid var(--color-border);
    }

    .ui-section:last-child {
        border-bottom: none;
    }

    .ui-section-title {
        font-size: 0.7rem;
        margin-bottom: 2px;
    }

    .btn {
        padding: 4px 6px;
        font-size: 0.7rem;
        min-height: 28px;
        line-height: 1;
    }

    .control-label {
        font-size: 0.68rem;
        margin-bottom: 2px;
    }

    .control-group {
        width: 100%;
        max-width: none;
        margin: 0 0 4px 0;
    }

    .number-input {
        font-size: 0.8rem;
        width: 100%;
        max-width: none;
        padding: 4px 6px;
        min-height: 28px;
    }

    #btn-drop-nuke,
    #btn-toggle-destroy,
    #btn-clear-all {
        width: 100% !important;
        max-width: none;
        margin-left: 0 !important;
        margin-right: 0 !important;
    }

    .stats-box {
        font-size: 0.72rem;
        padding: 4px;
    }

    .stat-row {
        padding: 2px 0;
    }

    .ui-subtitle {
        display: none;
    }

    .ui-section:nth-child(n+4) {
        display: block;
    }
}

@media (orientation: portrait) {
    #canvas {
        display: block;
    }

    .ui-panel,
    .tray-handle {
        opacity: 0.9;
    }

    body::before {
        content: none;
    }

    body::after {
        content: 'Rotate for best controls';
        position: fixed;
        top: 8px;
        left: 50%;
        transform: translateX(-50%);
        z-index: 1001;
        text-align: center;
        font-size: 0.82rem;
        font-weight: 600;
        color: #ffd0b2;
        background: rgba(14, 20, 34, 0.72);
        border: 1px solid rgba(255, 155, 120, 0.35);
        border-radius: 999px;
        padding: 5px 10px;
        pointer-events: none;
    }
}

@media (orientation: portrait) and (max-width: 900px) {
    #canvas,
    .ui-panel,
    .tray-handle,
    .camera-panel {
        display: none;
    }

    .rotate-overlay {
        display: flex;
        position: fixed;
        inset: 0;
        align-items: center;
        justify-content: center;
        background: rgba(14, 20, 34, 0.96);
        z-index: 1000;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 14px;
        --panel-width: clamp(150px, 40vw, 196px);
        --panel-offset: 6px;
    }

    .ui-panel {
        width: var(--panel-width);
        max-height: 52vh;
    }

    .tray-handle {
        left: calc(var(--panel-offset) + var(--panel-width) + var(--handle-gap));
    }

    .tray-handle-right {
        right: calc(var(--panel-offset) + var(--panel-width) + var(--handle-gap));
        left: auto;
    }

    .ui-header h1 {
        font-size: 1.1rem;
    }

    .button-grid {
        grid-template-columns: 1fr 1fr 1fr;
        gap: var(--spacing-xs);
    }

    .stats-box {
        font-size: 0.75rem;
    }

    .btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.6rem;
    }
}


html {
    scroll-behavior: smooth;
}


@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ui-panel {
    animation: fadeIn var(--transition-slow) ease-out;
}


button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}


@media print {
    .ui-panel {
        display: none;
    }
}


#mode-status {
    display: none;
    margin-top: 12px;
    padding: 10px;
    background: rgba(255, 107, 53, 0.15);
    border-radius: 6px;
    border-left: 3px solid #ff6b35;
    animation: fadeIn 0.3s ease-out;
}

#mode-status-text {
    margin: 0;
    font-size: 0.9rem;
    color: #ff6b35;
    font-weight: 500;
}