:root{--text:#37352f;--text-h:#1a1a1a;--text-muted:#787774;--bg:#f7f6f3;--bg-card:#fff;--border:#e3e2df;--border-light:#eae9e6;--accent:#2383e2;--accent-border:#2383e247;--accent-bg:#2383e214;--accent-hover:#1a6dc0;--success:#0b9960;--success-bg:#0b996014;--danger:#e03e3e;--danger-bg:#e03e3e14;--warning:#d4920c;--warning-bg:#d4920c14;--timeline-bg:#e8e6e1;--timeline-range:#2383e240;--timeline-range-border:#2383e2;--timeline-playhead:#e03e3e;--shadow-sm:0 1px 3px #0000000f, 0 1px 2px #0000000a;--shadow-md:0 4px 6px #00000012, 0 2px 4px #0000000d;--shadow-lg:0 10px 25px #0000001a, 0 6px 10px #0000000f;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--side-width:340px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;--font-mono:"SF Mono", "Cascadia Code", "Fira Code", "Consolas", monospace;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media 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12px}.drop-icon{font-size:28px}.timeline-track{height:38px}.range-handle{width:14px}.range-handle:after{width:8px;left:3px}.range-handle-end:after{left:auto;right:3px}}@media (width<=480px){.app-header{flex-direction:column;align-items:flex-start;gap:4px;padding:8px 12px}.panel-content{padding:8px}.editor-panel{gap:8px;padding:8px 10px}.player-wrapper{min-height:130px;max-height:40vh}.info-grid{grid-template-columns:1fr 1fr;gap:4px 10px}.time-inputs{padding:8px 10px}.batch-settings-card{padding:14px}.export-progress-area{padding:12px}.frame-controls{gap:4px}.timeline-info{font-size:11px}.tick-label{font-size:8px}}.language-switcher{flex-shrink:0;margin-inline-start:auto;position:relative}.lang-btn{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card);color:var(--text);cursor:pointer;white-space:nowrap;align-items:center;gap:6px;padding:6px 10px;font-family:inherit;font-size:12px;font-weight:500;transition:all 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