/* Ported from Docs/active/risse_studio_v3.html (Phase 3a). Source unchanged.
   Global `body` layout rule scoped onto #risse-root to coexist with _Layout. */
:root {
            --bg-dark: #09090b;
            --bg-panel: #18181b;
            --bg-panel-2: #1f1f23;
            --accent: #0ea5e9;
            --accent-2: #f59e0b;
            --accent-r: #ef4444;
            --accent-g: #10b981;
            --accent-b: #3b82f6;
            --text-main: #f4f4f5;
            --text-mute: #a1a1aa;
            --border-col: #27272a;
            --btn-active: #0284c7;
        }

        * { box-sizing: border-box; }
        #risse-root {
            margin: 0; padding: 0;
            font-family: 'Segoe UI', system-ui, sans-serif;
            background-color: var(--bg-dark);
            color: var(--text-main);
            display: flex; height: 100vh; overflow: hidden;
        }

        #sidebar {
            width: 340px;
            background-color: var(--bg-panel);
            padding: 22px;
            display: flex; flex-direction: column; gap: 18px;
            border-right: 1px solid var(--border-col);
            z-index: 10;
            overflow-y: auto;
        }

        h1 {
            margin: 0;
            font-size: 1.05rem;
            color: var(--accent);
            letter-spacing: 1.5px;
            font-weight: 700;
        }
        h1 .sub { color: var(--text-mute); font-weight: 400; letter-spacing: 0; font-size: 0.75rem; display: block; margin-top: 2px; }

        .section-title {
            font-size: 0.7rem;
            text-transform: uppercase;
            color: var(--text-mute);
            margin-bottom: 8px;
            letter-spacing: 1px;
            font-weight: 600;
        }

        .btn {
            background-color: transparent;
            color: var(--text-main);
            border: 1px solid var(--border-col);
            padding: 9px 12px; border-radius: 6px;
            cursor: pointer; font-weight: 600; width: 100%;
            transition: all 0.15s; margin-bottom: 4px; text-align: left;
            font-size: 0.85rem;
        }
        .btn:hover { background-color: #27272a; }
        .btn.active { background-color: var(--btn-active); border-color: var(--btn-active); color: white; }
        .btn.compact { padding: 7px 10px; font-size: 0.78rem; }
        .btn.danger { color: #fca5a5; border-color: #7f1d1d; }
        .btn.danger:hover { background-color: #7f1d1d; color: white; }
        .btn.primary { background-color: var(--accent); border-color: var(--accent); color: white; }
        .btn.primary:hover { background-color: var(--btn-active); }
        .btn:disabled { opacity: 0.4; cursor: not-allowed; }

        .btn-row { display: flex; gap: 6px; }
        .btn-row .btn { margin-bottom: 0; }

        .mode-tabs { display: flex; gap: 2px; padding: 3px; background: var(--bg-panel-2); border-radius: 8px; }
        .mode-tab {
            flex: 1;
            padding: 9px 8px;
            border-radius: 6px;
            text-align: center;
            font-size: 0.82rem;
            font-weight: 600;
            cursor: pointer;
            color: var(--text-mute);
            transition: all 0.15s;
            border: none;
            background: transparent;
        }
        .mode-tab.active { background: var(--accent); color: white; }

        #file-input, #json-input { display: none; }

        .color-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
        .color-swatch { aspect-ratio: 1; border-radius: 50%; cursor: pointer; border: 2px solid transparent; transition: all 0.15s; }
        .color-swatch:hover, .color-swatch.active { border-color: white; transform: scale(1.1); }

        .slider-row { display: flex; align-items: center; gap: 10px; }
        .slider-row input[type=range] { flex: 1; accent-color: var(--accent); }
        .slider-row .val {
            min-width: 28px;
            text-align: center;
            font-weight: 700;
            color: var(--accent);
            background: var(--bg-panel-2);
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 0.85rem;
        }

        .stat-box {
            background: var(--bg-panel-2);
            padding: 10px 12px;
            border-radius: 6px;
            font-size: 0.82rem;
            color: var(--text-mute);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .stat-box .num { color: var(--accent); font-weight: 700; font-size: 1.05rem; }

        .mode-panel { display: none; flex-direction: column; gap: 18px; }
        .mode-panel.active { display: flex; }

        /* First section-title of the global block — visual separator */
        .section-title.section-global-first {
            border-top: 1px solid var(--border-col);
            padding-top: 16px;
            margin-top: 4px;
        }

        .toggle-row {
            display: flex; align-items: center; gap: 8px;
            padding: 8px 10px;
            border: 1px solid var(--border-col);
            border-radius: 6px;
            font-size: 0.82rem;
            cursor: pointer;
            user-select: none;
        }
        .toggle-row:hover { background: #27272a; }
        .toggle-row input[type=checkbox] { accent-color: var(--accent); }

        .number-row {
            display: flex; align-items: center; gap: 8px;
            font-size: 0.82rem;
        }
        .number-row label { flex: 1; color: var(--text-mute); }
        .number-row input[type=number] {
            width: 60px;
            background: var(--bg-panel-2);
            color: var(--text-main);
            border: 1px solid var(--border-col);
            border-radius: 4px;
            padding: 4px 6px;
            font-size: 0.82rem;
            font-weight: 700;
            text-align: center;
        }
        .number-row input[type=number]:focus { outline: 1px solid var(--accent); }
        .number-row .unit { color: var(--text-mute); width: 12px; text-align: center; }

        .hint {
            font-size: 0.78rem;
            color: var(--text-mute);
            line-height: 1.5;
            padding: 10px 12px;
            background: var(--bg-panel-2);
            border-left: 2px solid var(--accent);
            border-radius: 4px;
        }
        .hint kbd {
            background: #3f3f46;
            padding: 1px 6px;
            border-radius: 3px;
            font-size: 0.7rem;
            color: var(--text-main);
            font-family: inherit;
        }

        .radio-row { display: flex; flex-direction: column; gap: 4px; }
        .radio-row label {
            display: flex; align-items: center; gap: 8px;
            padding: 6px 10px;
            border: 1px solid var(--border-col);
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.82rem;
            transition: all 0.15s;
        }
        .radio-row label:hover { background: #27272a; }
        .radio-row label.active { background: var(--btn-active); border-color: var(--btn-active); color: white; }
        .radio-row input[type=radio] { accent-color: var(--accent); }

        #loading-overlay {
            position: absolute; inset: 0; background: rgba(9,9,11,0.9);
            display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 10px;
            font-size: 1.2rem; font-weight: bold; z-index: 100; color: var(--accent);
            display: none;
        }

        /* Save-Modal */
        #save-modal {
            position: fixed; inset: 0;
            background: rgba(9,9,11,0.85);
            display: none;
            align-items: center; justify-content: center;
            z-index: 200;
        }
        #save-modal.open { display: flex; }
        #save-modal .modal-inner {
            background: var(--bg-panel);
            border: 1px solid var(--border-col);
            border-radius: 10px;
            padding: 22px;
            min-width: 360px; max-width: 520px;
            max-height: 70vh; overflow-y: auto;
        }
        #save-modal h2 {
            margin: 0 0 14px 0; font-size: 0.95rem;
            color: var(--accent); letter-spacing: 1px;
        }
        .save-item {
            display: flex; align-items: center; gap: 8px;
            padding: 10px 12px;
            border: 1px solid var(--border-col);
            border-radius: 6px;
            margin-bottom: 6px;
            background: var(--bg-panel-2);
        }
        .save-item .save-name { flex: 1; font-weight: 600; font-size: 0.85rem; }
        .save-item .save-meta { font-size: 0.7rem; color: var(--text-mute); margin-right: 8px; }
        .save-item button { font-size: 0.72rem; padding: 4px 8px; }

        #viewer-container { flex: 1; position: relative; background-color: #0c0c0e; }
        #render-canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; }

        #viewport-grid {
            position: absolute; top: 0; left: 0; width: 100%; height: 100%;
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            grid-template-rows: 1fr 1fr;
            grid-template-areas:
                "right front left"
                ".     top   iso";
            gap: 2px; z-index: 2;
        }

        #view-right { grid-area: right; }
        #view-front { grid-area: front; }
        #view-left  { grid-area: left; }
        #view-top   { grid-area: top; }
        #view-iso   { grid-area: iso; }

        #viewport-grid.single-view { display: block; }
        .viewport {
            position: relative;
            width: 100%; height: 100%;
            background-color: transparent;
            pointer-events: auto;
            cursor: crosshair;
            border: 1px solid #1c1c20;
        }
        .view-label {
            position: absolute;
            top: 8px; left: 8px;
            background: rgba(0, 0, 0, 0.75);
            color: #fff;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 10px;
            font-weight: 700;
            pointer-events: none;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .view-label.iso { background: rgba(14, 165, 233, 0.85); }

        #mode-indicator {
            position: absolute;
            top: 12px; right: 12px;
            background: rgba(14, 165, 233, 0.9);
            color: white;
            padding: 6px 14px;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 1px;
            text-transform: uppercase;
            z-index: 5;
            pointer-events: none;
        }

        #toast {
            position: absolute;
            bottom: 18px; left: 50%;
            transform: translateX(-50%);
            background: rgba(14, 165, 233, 0.95);
            color: white;
            padding: 8px 18px;
            border-radius: 6px;
            font-size: 0.82rem;
            font-weight: 600;
            z-index: 50;
            opacity: 0;
            transition: opacity 0.3s;
            pointer-events: none;
        }
        #toast.show { opacity: 1; }