/* ----- Reset & Variables ----- */
        *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

        :root {
            --bg: #0b0b0e;
            --bg-2: #16161d;
            --surface: rgba(255, 255, 255, 0.04);
            --surface-hover: rgba(255, 255, 255, 0.08);
            --border: rgba(255, 255, 255, 0.08);
            --text: #ededf0;
            --text-muted: #9898b0;
            --accent: #ff5001;
            --accent-glow: rgba(255, 80, 1, 0.3);
            --radius: 14px;
            --shadow: 0 20px 60px -12px rgba(0, 0, 0, 0.8);
            --transition: 0.45s cubic-bezier(0.4, 0, 0.2, 1);
            --spring: 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
            --display: 'Funnel Display', system-ui, sans-serif;
            --sans: 'Funnel Sans', system-ui, sans-serif;
        }

        body {
            font-family: var(--sans);
            background: linear-gradient(135deg, var(--bg) 0%, var(--bg-2) 100%);
            color: var(--text);
            min-height: 100vh;
            padding: 2rem 1.5rem 6rem;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
            transition: background var(--transition), color var(--transition);
        }

        :focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
        .container { max-width: 1320px; margin: 0 auto; }

        /* ----- Header ----- */
        header {
            position: fixed; left: 0; right: 0; bottom: 0; z-index: 900;
            display: flex; align-items: center; justify-content: center; gap: 0.75rem;
            padding: 0.7rem 1.5rem;
            background: var(--surface);
            backdrop-filter: blur(18px) saturate(140%);
            -webkit-backdrop-filter: blur(18px) saturate(140%);
            border-top: 1px solid var(--border);
            transition: border-color var(--transition), background var(--transition);
            min-height: 75px;
        }
        .logo { font-family: var(--display); font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; color: #fff; position: absolute; left: 1.5rem; }
        .logo b { color: var(--accent); font-weight: 700; }
        .header-actions { display: flex; align-items: center; gap: 0.55rem; position: absolute; right: 1.5rem; }

        /* ----- Buttons ----- */
        .btn {
            display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
            padding: 0.6rem 1.1rem; border: 1px solid var(--border); border-radius: 9px;
            font-family: var(--sans); font-size: 0.7rem; font-weight: 700;
            letter-spacing: 0.12em; text-transform: uppercase;
            background: var(--surface); color: var(--text); cursor: pointer;
            transition: all var(--transition); backdrop-filter: blur(4px); min-height: 42px; white-space: nowrap;
        }
        .btn i { font-size: 1.05rem; letter-spacing: 0; }
        .btn:hover { background: var(--surface-hover); border-color: var(--accent); transform: translateY(-2px); }
        .btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 4px 20px var(--accent-glow); }
        .btn-primary:hover { background: #e04800; border-color: #e04800; transform: translateY(-2px); box-shadow: 0 8px 32px var(--accent-glow); }
        .btn-primary:disabled { opacity: 0.4; pointer-events: none; filter: grayscale(0.6); }
        .btn-icon { padding: 0.6rem; width: 42px; height: 42px; font-size: 1.15rem; }

        /* ----- Upload Zone ----- */
        .upload-zone {
            position: relative; display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
            gap: 2rem; padding: 3.5rem 2rem; margin-bottom: 2.5rem;
            background: var(--surface); border: 2px dashed var(--border); border-radius: var(--radius);
            transition: all var(--transition); cursor: pointer; min-height: 240px; text-align: center;
            height: 56vh; margin-top: 20vh;
        }
        .upload-zone:hover, .upload-zone.dragover { border-color: var(--accent); background: rgba(255, 80, 1, 0.04); transform: scale(1.008); }
        .upload-zone .icon-wrap { font-size: 6.5rem; color: var(--text-muted); transition: transform 0.3s ease; }
        .upload-zone.dragover .icon-wrap { transform: scale(1.2); color: var(--accent); }
        .upload-zone .info h3 { font-family: var(--display); font-size: 1.5rem; font-weight: 700; letter-spacing: -0.01em; }
        .upload-zone .info p { color: var(--text-muted); font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; margin-top: 0.25rem; }
        .upload-zone .file-input-wrap { position: relative; display: inline-block; }
        .upload-zone .file-input-wrap input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }

        /* ----- Studio Grid ----- */
        .studio-grid { display: none; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-items: stretch; }
        .studio-grid.visible { display: grid; }

        .hero-image {
            position: relative; border-radius: var(--radius); overflow: hidden;
            /* background: #0a0a0c; */
             border: 1px solid var(--border); min-height: 320px;
        }
        .hero-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; display: block; }

        /* ----- Color List & Horizontal Accordion ----- */
        .hero-colors { display: flex; flex-direction: column; gap: 0.55rem; }

        .color-row {
            position: relative; display: flex; flex-direction: column;
            background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
            cursor: pointer; overflow: hidden; will-change: transform;
            transition: transform var(--spring), background var(--transition), border-color var(--transition), box-shadow var(--transition);
        }
        .color-row-main {
            display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem;
            padding: 0.8rem 1.1rem; min-height: 90px; width: 100%;
        }
        .color-row::before {
            content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
            background: var(--accent); transform: scaleY(0); transform-origin: center;
            transition: transform var(--spring);
        }
        .color-row:hover { transform: translateX(8px) scale(1.01); border-color: rgba(255, 255, 255, 0.18); background: var(--surface-hover); box-shadow: 0 14px 36px -12px rgba(0, 0, 0, 0.7); z-index: 3; }
        .color-row:hover::before { transform: scaleY(1); }
        .hero-colors:has(.color-row:hover) .color-row:not(:hover):not(.active) { transform: scale(0.97); opacity: 0.62; filter: saturate(0.7); }
        
        .color-row.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), 0 8px 24px var(--accent-glow); }
        .color-row.active::before { transform: scaleY(1); }

        .color-row .swatch { width: 56px; height: 56px; border-radius: 12px; flex-shrink: 0; border: 1px solid rgba(255, 255, 255, 0.08); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14); transition: width var(--spring), height var(--spring); }
        .color-row:hover .swatch { width: 76px; height: 76px; }

        .color-row .info { display: flex; flex-direction: column; gap: 0.25rem; min-width: 0; }
        .color-row .cname { font-family: var(--display); font-weight: 700; font-size: 1.55rem; line-height: 0.95; letter-spacing: -0.015em; color: #fff; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: font-size var(--spring); }
        .color-row:hover .cname { font-size: 1.75rem; }
        .color-row .meta { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
        .color-row .meta .hex { font-weight: 700; font-size: 0.78rem; letter-spacing: 0.04em; }
        .color-row .meta .rgb { font-weight: 400; font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted); }

        .color-row .role-col { display: flex; flex-direction: column; align-items: flex-end; justify-content: space-between; align-self: stretch; gap: 0.4rem; }
        .color-row .role { font-size: 0.6rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--text-muted); }
        
        .actions-col { display: flex; gap: 0.4rem; align-items: center; }

        .copy-btn, .chevron-toggle {
            background: transparent; border: none; color: var(--text-muted); cursor: pointer;
            padding: 0.4rem; border-radius: 8px; transition: all 0.15s ease;
            display: inline-flex; align-items: center; justify-content: center;
            font-size: 1.15rem; min-width: 40px; min-height: 40px;
        }
        .copy-btn:hover, .chevron-toggle:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
        .copy-btn.copied { color: #4ade80; }
        .color-row.active .chevron-toggle { color: var(--accent); }
        .color-row.active .chevron-toggle i { transform: rotate(180deg); }

        /* Horizontal Shade Panel */
        .shade-panel {
            display: grid; grid-template-rows: 0fr; transition: grid-template-rows var(--spring);
            background: rgba(0,0,0,0.15);
        }
        .shade-panel.open { grid-template-rows: 1fr; }
        .shade-panel-inner { overflow: hidden; }

        .shade-row-horizontal {
            display: flex; flex-direction: row; gap: 1rem;
            padding: 1rem 1.1rem 1rem 1.5rem;
             border-top: 1px solid var(--border);
            flex-wrap: wrap;
        }
        .shade-item {
            display: flex; flex-direction: column; align-items: center; gap: 0.4rem;
            flex: 1; min-width: 80px;
        }
        .shade-item .swatch-sm {
            width: 100%; height: 48px; border-radius: 10px; border: 1px solid rgba(255,255,255,0.1);
            cursor: pointer; transition: transform 0.2s ease;
        }
        .shade-item .swatch-sm:hover { transform: scale(1.15); border-color: var(--accent); }
        .shade-item .shade-name { font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600; }
        
        .copy-btn-sm {
            background: transparent; border: none; color: var(--text-muted); cursor: pointer;
            padding: 0.3rem; border-radius: 6px; transition: all 0.15s ease;
            display: inline-flex; align-items: center; justify-content: center; font-size: 1rem;
        }
        .copy-btn-sm:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
        .copy-btn-sm.copied { color: #4ade80; }

        /* ----- Posters Wrapper (Hidden by default) ----- */
        .posters-wrapper {
            grid-column: 1 / -1;
            display: none; /* Hidden initially */
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            align-items: stretch;
        }
        .posters-wrapper.visible { display: grid; }

        .posters-bar { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: 0.75rem; padding-top: 1.25rem; border-top: 1px solid var(--border); }
        .posters-bar .pb-left { display: flex; align-items: baseline; gap: 0.85rem; }
        .posters-bar h2 { font-family: var(--display); font-size: 1.4rem; font-weight: 700; letter-spacing: -0.01em; }
        .posters-bar .badge { font-size: 0.62rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted); background: var(--surface); padding: 0.3rem 0.7rem; border-radius: 20px; border: 1px solid var(--border); }
        .pb-actions { display: flex; gap: 0.5rem; }

        .poster-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: all var(--transition); }
        .poster-card:hover { border-color: rgba(255, 255, 255, 0.14); transform: translateY(-5px); box-shadow: var(--shadow); }
        .poster-card .card-header { display: flex; align-items: center; justify-content: space-between; padding: 0.7rem 1.1rem; border-bottom: 1px solid var(--border); font-size: 0.66rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); flex-wrap: wrap; gap: 0.5rem; }
        .poster-card .card-header .layer-info { font-weight: 400; text-transform: none; opacity: 0.5; font-size: 0.6rem; }
        .poster-card .canvas-wrap { position: relative; aspect-ratio: 1 / 1.317; background: #0a0a0c; overflow: hidden; }
        .poster-card .canvas-wrap canvas { display: block; width: 100%; height: 100%; object-fit: contain; }
        .poster-card .card-footer { padding: 0.65rem 1.1rem; display: flex; align-items: center; justify-content: flex-end; gap: 0.5rem; border-top: 1px solid var(--border); }

        /* ----- Palette Export Modal ----- */
        .export-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.85); backdrop-filter: blur(4px); z-index: 999; }
        .export-overlay.visible { display: block; }
        .palette-export-modal {
            display: none; position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
            background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius);
            padding: 2rem; z-index: 1000; min-width: 940px; box-shadow: var(--shadow);
        }
        .palette-export-modal.visible { display: block; }
        .modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
        .modal-header h3 { font-family: var(--display); font-size: 1.5rem; font-weight: 700; }
        .btn-close { background: transparent; border: 1px solid var(--border); }
        .btn-close:hover { background: var(--surface); }
        .modal-actions { display: flex; justify-content: center; margin-top: 1.5rem; }
        #paletteCanvas { display: block; width: 100%; height: auto; border-radius: 8px; background: #fff; }

        /* ----- Toast ----- */
        .toast {
            position: fixed; top: 1.25rem; left: 50%; transform: translateX(-50%) translateY(-30px);
            background: #18181b; border: 1px solid var(--border); color: #fff;
            padding: 0.7rem 1.8rem; border-radius: 10px; font-size: 0.85rem;
            backdrop-filter: blur(12px); box-shadow: var(--shadow);
            opacity: 0; pointer-events: none; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 999; display: flex; align-items: center; gap: 0.6rem;
        }
        .toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
        .toast i { color: var(--accent); }

        /* ----- Responsive ----- */
        @media (max-width: 1024px) { .palette-export-modal { min-width: 90vw; } }
        @media (max-width: 820px) {
            body { padding: 1.25rem 1rem 5.5rem; }
            .studio-grid { grid-template-columns: 1fr; align-items: start; }
            .posters-wrapper { grid-template-columns: 1fr; }
            .posters-bar { grid-column: auto; flex-direction: column; align-items: stretch; }
            .pb-actions { justify-content: stretch; }
            .pb-actions .btn { flex: 1; }
            .shade-row-horizontal { padding-left: 1.1rem; }
        }
        @media (max-width: 560px) {
            header { justify-content: center; padding: 0.6rem 0.75rem; }
            .logo { display: none; }
            .header-actions { position: static; gap: 0.4rem; width: 100%; justify-content: center; }
            .palette-export-modal { padding: 1rem; min-width: 95vw; }
            .color-row .meta .rgb { display: none; }
        }