*{box-sizing:border-box;margin:0;padding:0}[hidden]{display:none!important}:root{--primary:#7c5cff;--primary-soft:#f0ebff;--primary-dark:#5b3fd6;--bg:#f5f5fa;--surface:#fff;--surface-muted:#f0f0f5;--border:#e0e0e8;--border-strong:#d0d0d8;--text:#1a1a24;--text-muted:#6b6b7a;--text-subtle:#9494a3;--danger:#e8463a;--success:#1dc981;--warning:#efaa17;--shadow-sm:0 1px 3px rgba(0,0,0,.06);--shadow:0 2px 8px rgba(0,0,0,.08);--radius:8px;--radius-lg:12px;--radius-full:999px;--font:system-ui,-apple-system,"Noto Sans CJK SC","PingFang SC","WenQuanYi Micro Hei",sans-serif;--mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;--tr:.15s ease}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh;padding:0}.app{max-width:1440px;margin:0 auto;display:flex;flex-direction:column;gap:16px;padding:0 20px 20px}.app-header{text-align:center;padding:20px 0 8px}.app-header h1{font-size:26px;font-weight:700;letter-spacing:-.5px}.topnav{display:flex;align-items:center;justify-content:space-between;padding:10px max(20px,calc((100vw - 1440px)/2 + 20px));background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.topnav a{display:inline-flex;align-items:center;gap:4px;color:var(--primary);text-decoration:none;font-size:14px;font-weight:500}.topnav a:hover{text-decoration:underline}.topnav .brand{font-weight:700;color:var(--text)}.nav-right{display:flex;align-items:center;gap:16px}.subtitle{color:var(--text-muted);font-size:14px;margin-top:4px}.badge-row{display:flex;justify-content:center;gap:8px;margin-top:10px}.tag{display:inline-flex;align-items:center;padding:2px 10px;border:1px solid var(--border);border-radius:var(--radius-full);font-size:11px;color:var(--text-muted);background:var(--surface)}.tag.brand{color:var(--primary);border-color:color-mix(in srgb,var(--primary) 30%,var(--border));background:var(--primary-soft)}.encoder-status{font-size:12px;color:var(--text-muted)}.dropzone{display:block;border:2px dashed var(--border-strong);border-radius:var(--radius-lg);padding:36px 20px;text-align:center;background:var(--surface);transition:var(--tr);cursor:pointer;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}.dropzone:hover{border-color:var(--primary)}.dropzone.dragover{border-color:var(--primary);background:var(--primary-soft);transform:scale(1.01)}.dz-icon{font-size:36px;margin-bottom:6px}.dz-text{font-size:16px;font-weight:500}.dz-or{color:var(--text-subtle);font-size:12px;margin:4px 0}.dz-hint{color:var(--text-subtle);font-size:12px;margin-top:8px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;box-shadow:var(--shadow-sm)}.layout{display:grid;grid-template-columns:1fr 1.5fr;gap:20px;align-items:start}.layout-left{display:flex;flex-direction:column;gap:12px;position:sticky;top:60px}.layout-left .dropzone{padding:20px 16px}.layout-left .dropzone .dz-icon{font-size:28px}.layout-left .panel{padding:16px}.layout-left .settings{gap:10px}.layout-left .setting-row{flex-direction:column;gap:4px}.layout-left .setting-label{min-width:0;padding-top:0;font-size:12px}.layout-left .setting-control{gap:6px}.layout-left .bgm-name{max-width:140px}.layout-left .action-bar{padding:0}.layout-left .action-bar .btn-lg{width:100%;justify-content:center}.layout-right{display:flex;flex-direction:column;gap:12px}.empty-state{text-align:center;padding:60px 20px;color:var(--text-subtle);border:2px dashed var(--border);border-radius:var(--radius-lg);background:var(--surface)}.empty-state .empty-icon{font-size:40px;margin-bottom:8px}.empty-state p{font-size:14px}@media (max-width:880px){.layout{grid-template-columns:1fr}.layout-left{position:static}.layout-left .dropzone{padding:36px 20px}.layout-left .dropzone .dz-icon{font-size:36px}.layout-left .panel{padding:20px}.layout-left .settings{gap:14px}.layout-left .setting-row{flex-direction:row;gap:16px}.layout-left .setting-label{min-width:70px;padding-top:5px;font-size:13px}.layout-left .setting-control{gap:8px}.layout-left .bgm-name{max-width:200px}.empty-state{display:none}}.panel-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;flex-wrap:wrap;gap:8px}.panel-title{font-size:16px;font-weight:600}.panel-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.track-count{color:var(--text-muted);font-size:13px}#trackPanel .panel-header{position:sticky;top:var(--topnav-h,49px);z-index:50;background:var(--surface);margin:-20px -20px 16px;padding:20px 20px 14px;border-bottom:1px solid var(--border);border-radius:var(--radius-lg) var(--radius-lg) 0 0;transition:box-shadow .2s ease}#trackPanel .panel-header.stuck{box-shadow:0 4px 12px #0000000f}.prompt-sound-wrap{position:relative;display:inline-block}.prompt-split-btn{display:inline-flex;align-items:stretch}.prompt-split-btn #insertPromptBtn{border-top-right-radius:0;border-bottom-right-radius:0;border-right:none}.prompt-arrow-btn{border-top-left-radius:0;border-bottom-left-radius:0;padding:4px 6px;min-width:22px;font-size:10px;display:inline-flex;align-items:center;justify-content:center}.prompt-arrow-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary-dark)}.prompt-sound-menu{position:absolute;top:calc(100% + 6px);left:0;z-index:100;min-width:200px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-md);padding:6px;display:flex;flex-direction:column;gap:2px}.prompt-switch-menu{z-index:200}.psm-label{font-size:11px;color:var(--text-subtle);padding:4px 8px 6px;border-bottom:1px solid var(--border)}.psm-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border:none;background:transparent;border-radius:6px;font-size:14px;cursor:pointer;color:var(--text);text-align:left;transition:background .15s}.psm-item:hover{background:var(--primary-soft)}.psm-item.active{background:var(--primary-soft);color:var(--primary-dark);font-weight:600}.psm-desc{font-size:11px;color:var(--text-subtle);margin-left:auto}.psm-preview{margin-left:auto;border:none;background:transparent;color:var(--text-subtle);cursor:pointer;font-size:14px;padding:2px 6px;border-radius:4px;transition:all .15s;display:inline-flex;align-items:center;justify-content:center}.psm-preview:hover{background:var(--surface);color:var(--primary)}.psm-preview.playing{color:var(--primary)}.psm-item .psm-desc{margin-left:0}.psm-item .psm-preview{margin-left:auto}.track-list{display:flex;flex-direction:column;gap:8px}.track-card{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;padding:10px 14px;background:var(--surface-muted);border:1px solid var(--border);border-radius:var(--radius);transition:var(--tr);cursor:grab}.track-card.dragging{opacity:.35}.track-card.drag-over{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-soft)}.track-card.selected{border-color:var(--primary);background:var(--primary-soft);box-shadow:0 0 0 2px color-mix(in srgb,var(--primary) 20%,transparent)}.track-card.selected .track-idx{background:var(--primary);color:#fff}.track-card.prompt-track .track-name{cursor:pointer;color:var(--primary)}.track-card.prompt-track .track-name:hover{text-decoration:underline}.track-handle{color:var(--text-subtle);cursor:grab;font-size:16px;-webkit-user-select:none;user-select:none;line-height:1}.track-idx{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;background:var(--primary-soft);color:var(--primary);border-radius:var(--radius-full);font-size:12px;font-weight:600;flex-shrink:0}.track-name{font-size:14px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:200px}.track-dur{color:var(--text-muted);font-size:12px;font-family:var(--mono)}.track-err{color:var(--danger);font-size:12px}.track-settings{display:flex;align-items:center;gap:8px;margin-left:auto}.ts-item{display:flex;align-items:center;gap:3px;font-size:12px;color:var(--text-muted)}.ts-item span{white-space:nowrap}.num-input{width:44px;padding:3px 4px;border:1px solid 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strong{color:var(--primary);font-weight:600}.settings{display:flex;flex-direction:column;gap:14px}.setting-row{display:flex;align-items:flex-start;gap:16px}.setting-label{font-size:13px;font-weight:500;color:var(--text-muted);min-width:70px;flex-shrink:0;padding-top:5px}.setting-control{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.inline-label{display:flex;align-items:center;gap:3px;font-size:12px;color:var(--text-muted)}.select{padding:5px 10px;border:1px solid var(--border);border-radius:4px;font-size:13px;background:var(--surface);cursor:pointer}.divider{height:1px;background:var(--border);margin:4px 0}.bgm-upload{display:flex;align-items:center;gap:8px;width:100%;margin-bottom:6px}.bgm-name{font-size:12px;color:var(--text-muted);max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.bgm-options{display:flex;flex-wrap:wrap;align-items:center;gap:10px;width:100%;padding:10px;background:var(--surface-muted);border-radius:var(--radius)}.checkbox-label{display:inline-flex;align-items:center;gap:5px;font-size:12px;color:var(--text-muted);cursor:pointer}.checkbox-label input{cursor:pointer}.range-input{width:100px;vertical-align:middle}.apply-row{margin-top:2px}.apply-control{justify-content:center;width:100%}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.modal{background:var(--surface);border-radius:var(--radius-lg);width:100%;max-width:380px;box-shadow:0 20px 60px 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var(--border);border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;transition:var(--tr);background:var(--surface);color:var(--text);text-decoration:none;font-family:var(--font)}.btn:hover{border-color:var(--primary)}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark)}.btn-ghost{background:transparent;border-color:transparent;color:var(--text-muted)}.btn-ghost:hover{background:var(--surface-muted);color:var(--text)}.btn-outline{background:var(--primary-soft);border:1px solid var(--primary);color:var(--primary-dark);font-weight:600}.btn-outline:hover,.btn-outline.active{background:var(--primary);color:#fff;border-color:var(--primary-dark)}.btn-sm{padding:4px 10px;font-size:12px}.btn-lg{padding:12px 36px;font-size:16px}.action-bar{display:flex;justify-content:center;padding:4px 0}.progress-bar{height:8px;background:var(--surface-muted);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:var(--primary);border-radius:var(--radius-full);transition:width .2s ease;width:0}.progress-text{margin-top:8px;color:var(--text-muted);font-size:13px;text-align:center}.output-info{color:var(--text-muted);font-size:13px;margin-bottom:12px}.preview-audio{width:100%;margin-bottom:12px}.output-actions{display:flex;gap:12px;flex-wrap:wrap}.app-footer{text-align:center;padding:16px 0 8px}.app-footer p{color:var(--text-subtle);font-size:12px;line-height:1.8;max-width:100%;margin:0 auto}.toast-container{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:8px;z-index:1000;max-width:320px}.toast{padding:10px 16px;border-radius:var(--radius);font-size:13px;box-shadow:0 4px 16px #00000026;color:#fff;animation:slideIn .2s ease}.toast-error{background:var(--danger)}.toast-info{background:#333}.toast-success{background:var(--success)}@keyframes slideIn{0%{transform:translate(120%);opacity:0}to{transform:translate(0);opacity:1}}@media (max-width:640px){.setting-row{flex-direction:column;gap:6px}.setting-label{min-width:0;padding-top:0}.track-name{max-width:120px}.track-settings{margin-left:0;width:100%;justify-content:flex-start}.action-bar.mobile-float{position:fixed;bottom:0;left:0;right:0;z-index:90;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--border);box-shadow:0 -2px 12px #00000014}.action-bar.mobile-float .btn-primary{width:100%}body.has-float-bar{padding-bottom:80px}}.steps-bar{display:flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg)}.step-item{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-subtle)}.step-num{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:var(--radius-full);background:var(--surface-muted);color:var(--text-muted);font-size:11px;font-weight:600;flex-shrink:0}.step-item.active{color:var(--text);font-weight:500}.step-item.active .step-num{background:var(--primary);color:#fff}.step-item.done .step-num{background:var(--success);color:#fff}.step-divider{width:24px;height:1px;background:var(--border)}.panel-step{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:var(--radius-full);background:var(--primary);color:#fff;font-size:13px;font-weight:700;margin-right:8px;flex-shrink:0}.panel-title-wrap{display:flex;align-items:center}