/* ==========================================================================
   MASK ARENA — 3D Silhouette & Void Isolation Lab Stylesheet
   ========================================================================== */

:root {
    --bg-dark: #08080c;
    --bg-panel: rgba(18, 18, 26, 0.85);
    --bg-panel-subtle: rgba(255, 255, 255, 0.03);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-hover: rgba(0, 240, 255, 0.35);

    --accent-cyan: #00f0ff;
    --accent-cyan-glow: rgba(0, 240, 255, 0.35);
    --accent-purple: #a855f7;
    --accent-purple-glow: rgba(168, 85, 247, 0.35);
    --accent-gold: #ffd700;
    --accent-green: #10b981;
    --accent-red: #ef4444;

    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --font-main: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-heading: 'Space Grotesk', sans-serif;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-glow-cyan: 0 0 20px rgba(0, 240, 255, 0.25);
    --shadow-glow-purple: 0 0 20px rgba(168, 85, 247, 0.25);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body.arena-body {
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 240, 255, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(168, 85, 247, 0.05) 0%, transparent 40%);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 14px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* --------------------------------------------------------------------------
   Top Navigation Header
   -------------------------------------------------------------------------- */
.arena-header {
    height: 60px;
    background: rgba(10, 10, 16, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.back-studio-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
    transition: all 0.2s ease;
}

.back-studio-btn:hover {
    background: rgba(0, 240, 255, 0.15);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.arena-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-badge {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: #000000;
    font-size: 10px;
    font-weight: 900;
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.arena-brand h1 {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #ffffff 40%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-tagline {
    font-size: 12px;
    color: var(--text-muted);
    display: none;
}

@media (min-width: 1024px) {
    .brand-tagline {
        display: inline;
    }
}

.header-center {
    display: flex;
    align-items: center;
}

.active-source-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-glass);
    padding: 5px 14px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.pill-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
}

.pill-dot.green {
    background: var(--accent-green);
    box-shadow: 0 0 8px var(--accent-green);
}

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

.wifi-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 240, 255, 0.08);
    border: 1px solid rgba(0, 240, 255, 0.2);
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    color: var(--accent-cyan);
    font-family: var(--font-mono);
}

.btn-header-action {
    display: flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--accent-cyan), #00a8ff);
    color: #000000;
    border: none;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-header-action:hover {
    box-shadow: var(--shadow-glow-cyan);
    transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   3-Column Main Workspace Container
   -------------------------------------------------------------------------- */
.arena-container {
    display: grid;
    grid-template-columns: 340px 1fr 340px;
    gap: 16px;
    padding: 16px;
    flex: 1;
    height: calc(100vh - 60px);
    overflow: hidden;
}

.arena-panel {
    background: var(--bg-panel);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 16px;
    overflow-y: auto;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.panel-section {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.section-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.section-title-row h3 {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--accent-cyan);
}

.btn-xs {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-xs:hover {
    color: #ffffff;
    border-color: var(--accent-cyan);
}

/* --------------------------------------------------------------------------
   Upload & Source Picker
   -------------------------------------------------------------------------- */
.upload-dropzone {
    border: 1px dashed rgba(0, 240, 255, 0.3);
    background: rgba(0, 240, 255, 0.03);
    border-radius: var(--radius-md);
    padding: 14px 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-dropzone:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 240, 255, 0.08);
}

.dropzone-icon {
    font-size: 22px;
    display: block;
    margin-bottom: 4px;
}

.dropzone-text {
    font-size: 12px;
    color: var(--text-primary);
    display: block;
}

.dropzone-text strong {
    color: var(--accent-cyan);
}

.dropzone-sub {
    font-size: 10px;
    color: var(--text-muted);
    display: block;
    margin-top: 2px;
}

.source-thumbnails-scroll {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    max-height: 150px;
    overflow-y: auto;
    padding-right: 4px;
}

.source-thumb-item {
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-glass);
    cursor: pointer;
    position: relative;
    background: #000000;
    transition: all 0.2s ease;
}

.source-thumb-item:hover {
    border-color: var(--accent-cyan);
    transform: scale(1.03);
}

.source-thumb-item.active {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 10px var(--accent-cyan-glow);
}

.source-thumb-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* --------------------------------------------------------------------------
   Engine Switcher Tabs
   -------------------------------------------------------------------------- */
.engine-tabs {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.engine-tab {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    color: var(--text-secondary);
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
}

.engine-tab:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #ffffff;
}

.engine-tab.active {
    background: rgba(0, 240, 255, 0.1);
    border-color: var(--accent-cyan);
    color: #ffffff;
    box-shadow: inset 0 0 12px rgba(0, 240, 255, 0.15);
}

.engine-tab.highlight-gemini {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(0, 240, 255, 0.06));
    border-color: rgba(168, 85, 247, 0.3);
}

.engine-tab.highlight-gemini:hover {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(0, 240, 255, 0.12));
    border-color: var(--accent-purple);
}

.engine-tab.highlight-gemini.active {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(0, 240, 255, 0.15));
    border-color: var(--accent-purple);
    box-shadow: 0 0 14px var(--accent-purple-glow), inset 0 0 10px rgba(168, 85, 247, 0.2);
}

.ortho-mode-pills {
    display: flex;
    gap: 6px;
}

.param-hint-text {
    font-size: 10px;
    color: var(--accent-cyan);
    line-height: 1.4;
    margin-top: 2px;
}

.form-textarea-sm {
    width: 100%;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 12px;
    outline: none;
    resize: vertical;
}

.form-textarea-sm:focus {
    border-color: var(--accent-purple);
}

.label-hint {
    font-size: 10px;
    color: var(--accent-purple);
    font-weight: 700;
    margin-left: 6px;
}

.tab-icon {
    font-size: 18px;
}

.tab-info {
    display: flex;
    flex-direction: column;
}

.tab-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-primary);
}

.tab-desc {
    font-size: 10px;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Engine Parameters Form Controls
   -------------------------------------------------------------------------- */
.params-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.interactive-prompt-guide {
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 11px;
}

.guide-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
}

.dot-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.dot-indicator.green {
    background: var(--accent-green);
    box-shadow: 0 0 6px var(--accent-green);
}

.dot-indicator.red {
    background: var(--accent-red);
    box-shadow: 0 0 6px var(--accent-red);
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.slider-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
}

.val-badge {
    background: rgba(0, 0, 0, 0.5);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--accent-cyan);
}

.form-range {
    width: 100%;
    accent-color: var(--accent-cyan);
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.form-range.purple {
    accent-color: var(--accent-purple);
}

.form-range.gold {
    accent-color: var(--accent-gold);
}

.auto-mode-pills, .brush-mode-pills {
    display: flex;
    gap: 6px;
}

.mode-pill {
    flex: 1;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 6px 4px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
}

.mode-pill:hover {
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.2);
}

.mode-pill.active {
    background: rgba(0, 240, 255, 0.15);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    font-weight: 700;
}

.universal-refinements {
    border-top: 1px solid var(--border-glass);
    padding-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.actions-row {
    display: flex;
    gap: 8px;
    margin-top: 4px;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 13px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-cyan), #00a8ff);
    color: #000000;
    flex: 1;
}

.btn-accent:hover {
    box-shadow: var(--shadow-glow-cyan);
    transform: translateY(-1px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.full-btn {
    width: 100%;
}

/* --------------------------------------------------------------------------
   CENTER WORKSPACE: Interactive Canvas Viewport
   -------------------------------------------------------------------------- */
.arena-canvas-workspace {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.canvas-floating-toolbar {
    height: 48px;
    background: rgba(14, 14, 22, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    z-index: 10;
}

.tool-btn-group, .tool-btn-group-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tool-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
}

.tool-btn.active {
    background: rgba(0, 240, 255, 0.15);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    font-weight: 700;
}

.tool-btn-sm {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-family: var(--font-mono);
    cursor: pointer;
}

.tool-btn-sm:hover {
    color: #ffffff;
    border-color: var(--accent-cyan);
}

.canvas-viewport {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    cursor: crosshair;
    background-color: #030305;
    background-image: 
        radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 0);
    background-size: 24px 24px;
}

.canvas-layers-stack {
    position: relative;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.canvas-layers-stack canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.canvas-layers-stack canvas:first-child {
    position: relative;
}

.canvas-loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    z-index: 20;
}

.loader-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 240, 255, 0.2);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader-text {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-cyan);
    letter-spacing: 0.5px;
}

.canvas-helper-hint {
    position: absolute;
    bottom: 12px;
    left: 12px;
    right: 12px;
    background: rgba(10, 10, 16, 0.85);
    border: 1px solid var(--border-glass);
    border-radius: 999px;
    padding: 6px 14px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    pointer-events: none;
    z-index: 5;
}

/* --------------------------------------------------------------------------
   RIGHT COLUMN: Arena Inspector & Export Deck
   -------------------------------------------------------------------------- */
.view-mode-tabs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
}

.view-tab {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 6px 2px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
}

.view-tab:hover {
    color: #ffffff;
}

.view-tab.active {
    background: rgba(168, 85, 247, 0.15);
    border-color: var(--accent-purple);
    color: #ffffff;
    font-weight: 700;
}

.inspector-preview-box {
    width: 100%;
    aspect-ratio: 16 / 9;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: #000000;
}

.inspector-preview-box.cutout-bg {
    background-image: 
        linear-gradient(45deg, #18181f 25%, transparent 25%),
        linear-gradient(-45deg, #18181f 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #18181f 75%),
        linear-gradient(-45deg, transparent 75%, #18181f 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
    background-color: #0d0d12;
}

.inspector-preview-box img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.empty-inspector-msg {
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
    padding: 20px;
    line-height: 1.5;
}

.empty-inspector-msg strong {
    color: var(--accent-cyan);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.stat-card {
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-label {
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 700;
}

.stat-value.cyan { color: var(--accent-cyan); }
.stat-value.purple { color: var(--accent-purple); }
.stat-value.green { color: var(--accent-green); }

.export-section {
    background: linear-gradient(180deg, rgba(0, 240, 255, 0.04), rgba(168, 85, 247, 0.05));
    border-color: rgba(0, 240, 255, 0.2);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-label-sm {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-input {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12px;
    outline: none;
}

.form-input:focus {
    border-color: var(--accent-cyan);
}

.export-checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    color: var(--text-secondary);
}

.export-checkbox-row input[type="checkbox"] {
    accent-color: var(--accent-cyan);
}

.save-success-box {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid var(--accent-green);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.save-success-box .success-icon {
    font-size: 18px;
    color: var(--accent-green);
    font-weight: 900;
}

.save-success-box .success-text strong {
    color: var(--accent-green);
    display: block;
    font-size: 13px;
}

.save-success-box .success-text span {
    font-size: 11px;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Toast Alerts
   -------------------------------------------------------------------------- */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1000;
    pointer-events: none;
}

.toast {
    background: rgba(15, 15, 23, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 12px 18px;
    font-size: 13px;
    font-weight: 600;
    color: #ffffff;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    gap: 10px;
    pointer-events: auto;
    animation: toastSlide 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.success { border-color: var(--accent-green); }
.toast.error { border-color: var(--accent-red); }
.toast.info { border-color: var(--accent-cyan); }

@keyframes toastSlide {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* --------------------------------------------------------------------------
   RESPONSIVE MEDIA QUERIES (Mobile & Tablet)
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
    .arena-container {
        grid-template-columns: 1fr;
        height: auto;
        overflow-y: auto;
    }
    
    .arena-canvas-workspace {
        min-height: 480px;
        order: 1;
    }

    .left-panel {
        order: 2;
    }

    .right-panel {
        order: 3;
    }
}