.da-wrapper {
        --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
        --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
        --PB: var(--border-color);
        --PG: var(--card-bg);
        display: flex;
        justify-content: center;
            padding: clamp(0px, 5vw, 0px) 20px;
    }

    .da-panel {
        position: relative;                
        width: 100%;
        max-width: 1400px;
        border-radius: 28px;
        padding: clamp(28px, 5vw, 56px);
        overflow: hidden;
    }

    

    /* ---------- HERO ---------- */
    .da-hero { text-align: center; max-width: 800px; margin: 0 auto; padding: clamp(10px, 4vw, 30px) 0; }

    .da-hero-badge {
        display: inline-flex; align-items: center; gap: 8px;
        font-size: 12.5px; font-weight: 800; letter-spacing: 0.3px;
        color: var(--primary-color); background: var(--primary-light);
        padding: 7px 16px; border-radius: 100px; margin-bottom: 22px;
    }

    .da-hero-title {
        font-size: clamp(30px, 4.4vw, 44px);
        font-weight: 900;
        line-height: 1.15;
        letter-spacing: -0.025em;
        color: var(--text-main);
        margin-bottom: 16px;
    }

    .da-hero-title em {
        font-style: normal;
        background: linear-gradient(120deg, #3b82f6, var(--primary-color));
        -webkit-background-clip: text; background-clip: text; color: transparent;
    }

    .da-hero-desc { font-size: 16.5px; color: var(--text-muted); line-height: 1.7; margin-bottom: 36px; }

    /* --- STUDIO APP WRAPPER --- */
    .studio-app {
        display: flex; flex-direction: column; 
        background: var(--card-bg); border: 1px solid var(--border-color);
        border-radius: 20px; overflow: hidden; box-shadow: 0 10px 40px rgba(0,0,0,0.05);
        margin-bottom: 30px;
    }

    /* PREVIEW VIEWPORT */
    .preview-viewport {
        position: relative; height: 180px; background: #0f172a; 
        border-bottom: 1px solid var(--border-color); overflow: hidden;
        display: flex; align-items: center; justify-content: center;
    }
    .wave-canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; }
    .ws-centerline { position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: rgba(255,255,255,0.2); z-index: 2; pointer-events: none; }
    .preview-badge {
        position: absolute; top: 12px; left: 12px; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px);
        padding: 6px 12px; border-radius: 6px; font-size: 11px; font-weight: 800; color: #fff; z-index: 3;
        display: none;
    }
    .preview-badge.visible { display: block; }
    
    .upload-overlay {
        position: absolute; inset: 0; background: rgba(15,23,42,0.85); backdrop-filter: blur(2px);
        display: flex; flex-direction: column; align-items: center; justify-content: center;
        z-index: 10; cursor: pointer; transition: all 0.2s;
    }
    .upload-overlay:hover { background: rgba(15,23,42,0.9); }
    .upload-overlay.hidden { opacity: 0; pointer-events: none; }
    .uo-icon { color: var(--primary-color); margin-bottom: 12px; transition: transform 0.2s var(--ease-spring); }
    .upload-overlay:hover .uo-icon { transform: scale(1.1) translateY(-5px); }
    .uo-title { font-size: 16px; font-weight: 900; color: #fff; margin-bottom: 6px; }
    .uo-sub { font-size: 12px; font-weight: 700; color: #94a3b8; }

    /* PRESETS BAR */
    .presets-bar {
        display: flex; align-items: center; gap: 8px; padding: 12px 20px;
        background: var(--bg-body); border-bottom: 1px solid var(--border-color);
        overflow-x: auto;
    }
    .presets-label { font-size: 12px; font-weight: 900; color: var(--text-muted); display: flex; align-items: center; gap: 6px; text-transform: uppercase; letter-spacing: 0.5px; }
    .presets-sep { width: 1px; height: 16px; background: var(--border-color); margin: 0 8px; }
    .preset-btn {
        background: var(--card-bg); border: 1px solid var(--border-color); color: var(--text-main);
        padding: 6px 14px; border-radius: 100px; font-size: 12px; font-weight: 800;
        cursor: pointer; transition: all 0.2s; white-space: nowrap; display: flex; align-items: center; gap: 6px;
    }
    .preset-btn:hover { border-color: var(--primary-color); background: var(--primary-light); }
    .preset-btn.active { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }

    /* ACTION HINT BAR */
    .action-hint-bar {
        display: flex; align-items: center; justify-content: space-between;
        padding: 10px 20px; background: #fffbeb; border-bottom: 1px solid #fde68a;
        display: none;
    }
    .action-hint-bar.visible { display: flex; animation: slideDown 0.3s var(--ease-spring); }
    @keyframes slideDown { from { transform: translateY(-10px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
    .hint-text { font-size: 12px; font-weight: 800; color: #b45309; display: flex; align-items: center; gap: 8px; }
    .hint-actions { display: flex; gap: 8px; }
    .btn-hint {
        background: #fff; border: 1px solid #fcd34d; color: #b45309;
        padding: 4px 10px; border-radius: 6px; font-size: 11px; font-weight: 800;
        cursor: pointer; display: flex; align-items: center; gap: 6px; transition: 0.2s;
    }
    .btn-hint:hover { background: #fef3c7; }

    /* MIXER DECK */
    .mixer-deck {
        display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px; padding: 24px; border-bottom: 1px solid var(--border-color);
        background: var(--card-bg);
    }
    .fader-group { display: flex; flex-direction: column; gap: 12px; }
    .fg-header { display: flex; justify-content: space-between; align-items: center; }
    .fg-title { font-size: 13px; font-weight: 900; color: var(--text-main); display: flex; align-items: center; gap: 8px; }
    .fg-val { font-size: 16px; font-weight: 900; color: var(--primary-color); font-family: 'Space Mono', monospace; }
    
    input[type=range].c-fader {
        -webkit-appearance: none; width: 100%; height: 6px; border-radius: 4px;
        background: var(--border-color); outline: none; margin: 10px 0;
    }
    input[type=range].c-fader::-webkit-slider-thumb {
        -webkit-appearance: none; appearance: none; width: 20px; height: 20px; border-radius: 50%;
        background: #fff; border: 2px solid var(--primary-color); cursor: pointer;
        box-shadow: 0 2px 6px rgba(0,0,0,0.1); transition: 0.2s;
    }
    input[type=range].c-fader::-webkit-slider-thumb:hover { transform: scale(1.1); }
    input[type=number].fg-inp {
        width: 60px; background: transparent; border: none; border-bottom: 2px solid var(--border-color);
        color: var(--primary-color); font-family: 'Space Mono', monospace; font-size: 16px; font-weight: 900;
        text-align: right; outline: none; padding-bottom: 2px; transition: 0.2s;
    }
    input[type=number].fg-inp:focus { border-color: var(--primary-color); }

    /* GLOBAL ACTION BAR */
    .global-bar {
        display: flex; justify-content: space-between; align-items: center;
        padding: 16px 24px; background: var(--bg-body); border-bottom: 1px solid var(--border-color);
    }
    .gb-group { display: flex; gap: 12px; }
    .btn-action {
        display: flex; align-items: center; gap: 8px; background: var(--card-bg);
        border: 1px solid var(--border-color); color: var(--text-main);
        padding: 10px 20px; border-radius: 8px; font-size: 13px; font-weight: 800;
        cursor: pointer; transition: all 0.2s;
    }
    .btn-action:hover:not(:disabled) { background: var(--primary-light); color: var(--primary-color); border-color: var(--primary-color); }
    .btn-action:disabled { opacity: 0.5; cursor: not-allowed; }
    .btn-action.btn-primary { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }
    .btn-action.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.3); }
    .btn-action.btn-success { background: #10b981; color: #fff; border-color: #10b981; }
    .btn-action.btn-success:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(16,185,129,0.3); }

    /* BATCH MANAGER */
    .batch-manager { display: flex; flex-direction: column; }
    .bm-header {
        display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 16px;
        padding: 12px 24px; font-size: 11px; font-weight: 900; color: var(--text-muted);
        text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 1px solid var(--border-color);
    }
    .batch-list { max-height: 400px; overflow-y: auto; background: var(--card-bg); }
    .empty-state { padding: 40px 20px; text-align: center; color: var(--text-muted); font-size: 13px; font-weight: 700; }
    
    .file-item {
        display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 16px; align-items: center;
        padding: 16px 24px; border-bottom: 1px solid var(--border-color); transition: 0.2s;
    }
    .file-item:last-child { border-bottom: none; }
    .file-item:hover { background: #f8fafc; }
    .file-item.active { background: var(--primary-light); border-left: 3px solid var(--primary-color); }
    
    .fi-info { display: flex; align-items: center; gap: 12px; cursor: pointer; overflow: hidden; }
    .fi-icon { width: 32px; height: 32px; border-radius: 8px; background: #e2e8f0; display: flex; align-items: center; justify-content: center; color: var(--text-muted); flex-shrink: 0; }
    .fi-text { overflow: hidden; }
    .fi-name { font-size: 13px; font-weight: 800; color: var(--text-main); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .fi-meta { font-size: 11px; font-weight: 700; color: var(--text-muted); font-family: 'Space Mono', monospace; }
    
    .fi-times { display: flex; flex-direction: column; gap: 4px; font-family: 'Space Mono', monospace; font-size: 11px; font-weight: 700; }
    .time-orig { color: var(--text-muted); }
    .time-new { color: #10b981; }
    .time-saved { color: var(--primary-color); }
    
    .fi-status { display: flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 800; color: var(--text-muted); }
    .fi-status.processing { color: var(--primary-color); }
    .fi-status.done { color: #10b981; }
    .fi-status.error { color: #ef4444; }
    
    .fi-progress-bar { width: 100%; height: 4px; background: var(--border-color); border-radius: 2px; margin-top: 6px; overflow: hidden; }
    .fi-progress-fill { height: 100%; background: var(--primary-color); transition: width 0.1s linear; }
    
    .fi-actions { display: flex; justify-content: flex-end; gap: 8px; }
    .fi-btn {
        width: 28px; height: 28px; border-radius: 6px; border: 1px solid var(--border-color); background: #fff;
        display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--text-main); transition: 0.2s;
    }
    .fi-btn:hover:not(:disabled) { background: var(--primary-light); color: var(--primary-color); border-color: var(--primary-color); }
    .fi-btn.dl { color: #10b981; }
    .fi-btn.dl:hover:not(:disabled) { background: #d1fae5; border-color: #10b981; }
    .fi-btn.del { color: #ef4444; }
    .fi-btn.del:hover:not(:disabled) { background: #fee2e2; border-color: #ef4444; }
    .fi-btn:disabled { opacity: 0.5; cursor: not-allowed; }

    .spin { animation: spin 1s linear infinite; }
    @keyframes spin { 100% { transform: rotate(360deg); } }

    /* Toast */
    .toast-overlay { position: fixed; bottom: 24px; right: 24px; z-index: 99999; display: flex; flex-direction: column; gap: 10px; pointer-events: none; }
    .toast-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 12px; padding: 16px 20px; display: flex; align-items: center; gap: 12px; font-size: 14px; font-weight: 800; color: var(--text-main); box-shadow: 0 10px 40px rgba(0,0,0,0.1); transform: translateX(120%); opacity: 0; transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); pointer-events: auto; }
    .toast-overlay.show .toast-card { transform: translateX(0); opacity: 1; }
    .toast-card svg { color: var(--primary-color); }
    
    /* ── Comparison Panel & Analytics ── */
    .comparison-panel {
        background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 24px;
        padding: 28px; margin-top: 32px; box-shadow: 0 10px 30px rgba(0,0,0,0.02); margin-bottom: 40px;
    }
    .cp-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
    .cp-title { font-size: 16px; font-weight: 800; color: var(--text-main); display: flex; align-items: center; gap: 10px; }
    .cp-badge { font-size: 12px; font-weight: 800; padding: 6px 14px; border-radius: 100px; }
    .badge-high { background: color-mix(in srgb, var(--success, #10b981) 15%, transparent); color: var(--success, #10b981); border: 1px solid color-mix(in srgb, var(--success, #10b981) 30%, transparent); }

    .cp-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
    .cp-card { background: var(--bg-body); border: 1px solid var(--border-color); border-radius: 16px; padding: 20px; display: flex; flex-direction: column; gap: 14px; }
    .cpc-header { display: flex; justify-content: space-between; align-items: center; }
    .cpc-title { font-size: 13.5px; font-weight: 800; color: var(--text-main); }
    .cpc-tag { font-size: 11.5px; font-weight: 800; padding: 4px 10px; border-radius: 6px; }
    .cpc-tag.success { background: color-mix(in srgb, var(--success, #10b981) 15%, transparent); color: var(--success, #10b981); }

    .cpc-body { display: flex; flex-direction: column; gap: 10px; }
    .cpc-stat-row { font-size: 13px; color: var(--text-muted); display: flex; justify-content: space-between; }
    .cpc-stat-row strong { color: var(--text-main); font-weight: 700; }
    .cpc-progress-bar { width: 100%; height: 8px; background: var(--border-color); border-radius: 100px; overflow: hidden; margin-top: 4px; }
    .cpc-progress-fill { height: 100%; background: var(--primary-color); border-radius: 100px; transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
    .cpc-progress-fill.bg-gradient { background: linear-gradient(90deg, var(--primary-color), var(--primary-gradient-end)); }