:root{color-scheme:light;--bg:#f7f8fc;--surface:#fff;--text:#20273b;--muted:#5f6b82;--line:#e1e6ef;--accent:#4259e9;--soft:#edf0ff;--danger:#a72d42;font:14px/1.6 Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg)}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button,input:not([type=range]),select{min-height:44px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--text);padding:8px 12px}button:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}button:disabled{opacity:.45;cursor:not-allowed}a{color:var(--accent);text-underline-offset:3px}:focus-visible{outline:3px solid var(--accent);outline-offset:3px}[hidden]{display:none!important}h1,h2,p{margin:0}h1{font-size:28px;letter-spacing:-.03em}h2{font-size:15px}a,button,small,strong{overflow-wrap:anywhere}.header{height:64px;background:var(--surface);border-bottom:1px solid var(--line)}.nav-shell{height:100%;max-width:1440px;margin:auto;padding:0 24px;display:flex;gap:16px;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--text);font-weight:800;letter-spacing:.07em}.brand img{display:block}nav{display:flex;gap:20px}nav a{text-decoration:none;min-height:44px;display:inline-flex;align-items:center}main{max-width:1440px;margin:auto;padding:24px}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 0 20px}.page-heading p{color:var(--muted);margin-top:4px}.local-badge{background:#edf8f1;color:#256448;padding:6px 12px;border-radius:24px;white-space:nowrap;font-size:12px}.notice{border:1px solid var(--line);padding:10px 14px;border-radius:10px;margin-bottom:14px;overflow-wrap:anywhere;background:var(--surface)}.notice.error{background:#fff0f2;color:var(--danger);border-color:#efc6ce}.workspace{display:grid;grid-template-columns:250px minmax(0,1fr) 240px;gap:16px;align-items:start}.panel{min-width:0;border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden}.panel-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px;border-bottom:1px solid var(--line)}.panel-heading span{font-size:11px;color:var(--muted);text-align:right;overflow-wrap:anywhere}.media-panel,.output-panel{padding-bottom:16px}.drop-zone{margin:16px;min-height:156px;border:1px dashed #b9c2db;border-radius:10px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:4px;background:#fafbff;text-align:center;padding:16px 8px;position:relative;cursor:pointer}.drop-zone:focus-within,.drop-zone.dragging{outline:2px solid var(--accent);background:var(--soft)}.drop-zone input{position:absolute;opacity:0;width:100%;height:100%;inset:0;cursor:pointer}.drop-zone span:not(.upload-icon){color:var(--muted);font-size:12px}.drop-zone small{font-size:10px;color:var(--muted)}.upload-icon{font-size:26px;color:var(--accent);line-height:1.3}.hint{font-size:12px;color:var(--muted);line-height:1.8}.media-panel>.hint,.output-panel>.hint{padding:0 16px}.empty{padding:24px 16px;color:var(--muted);text-align:center}ol{list-style:none;padding:0 12px;margin:12px 0;max-height:450px;overflow:auto}.clip{border:1px solid var(--line);border-radius:9px;margin-bottom:8px;padding:6px;background:var(--bg)}.clip.selected{background:var(--soft);border-color:var(--accent)}.clip-select{display:block;width:100%;text-align:left;border:0;background:transparent;padding:6px;font-size:12px}.clip-select strong,.clip-select small{display:block}.clip-select strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.clip-select small{color:var(--muted);font-weight:400}.clip-actions{display:flex;justify-content:flex-end;gap:4px}.clip-actions button{min-width:44px;min-height:44px;padding:5px 8px;font-size:12px}.history{display:flex;gap:6px;padding:0 12px}.history button{flex:1;padding:8px 4px;font-size:12px}.stage{height:320px;display:flex;align-items:center;justify-content:center;background:#111827;padding:16px;color:#c9d1e0;text-align:center}canvas{display:block;max-height:100%;max-width:100%;object-fit:contain}#empty-preview>span{display:block;font-size:52px;line-height:1.3;margin-bottom:12px;color:#95a5c5}#empty-preview strong{font-size:16px}#empty-preview p{font-size:12px;margin-top:6px;color:#95a5c5}.transport{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line)}.transport button{font-size:12px;white-space:nowrap;padding:8px}.transport input{min-width:36px;flex:1}.transport output{font:11px ui-monospace,monospace;white-space:nowrap;font-variant-numeric:tabular-nums}input[type=range]{min-height:44px;accent-color:var(--accent);width:100%;margin:0}fieldset{border:0;margin:0;min-width:0;padding:16px}legend{padding:14px 0 0;font-size:12px;font-weight:700}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}label{display:block;font-size:12px;color:var(--muted)}label input:not([type=range]),label select{display:block;width:100%;min-width:0;margin-top:5px}label output{float:right}fieldset[disabled]{opacity:.55}.actions{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.actions button{padding:8px 10px;font-size:11px}.actions button[aria-pressed=true]{color:var(--accent);border-color:var(--accent);background:var(--soft)}.output-panel fieldset{display:grid;gap:12px}.summary{display:flex;justify-content:space-between;gap:10px;margin:0 16px 14px;padding:12px 0;border-top:1px solid var(--line);font-size:12px}.summary strong{font-variant-numeric:tabular-nums}#export,#cancel,.download{display:block;width:calc(100% - 32px);margin:0 16px 12px;text-align:center}.primary{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:700}.primary:hover:not(:disabled){background:#3448cb;color:#fff}.download{min-height:44px;padding:10px;border-radius:9px;background:#edf8f1;color:#256448;font-weight:700}.output-panel progress{width:calc(100% - 32px);margin:0 16px 12px;accent-color:var(--accent)}.footer-note{margin:20px 0;color:var(--muted);font-size:12px}.footer-note a{margin-left:8px}.skip-link{position:absolute;top:-60px;left:16px;z-index:5;background:white;padding:10px}.skip-link:focus{top:8px}.sr-only,.media-source{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.media-source{pointer-events:none}
@media(min-width:1600px){.stage{height:400px}}@media(max-width:1150px){.workspace{grid-template-columns:230px minmax(0,1fr)}.output-panel{grid-column:1/-1}.output-panel fieldset{grid-template-columns:repeat(3,minmax(0,1fr))}.output-panel .summary{max-width:320px}.output-panel #export,.output-panel #cancel,.output-panel .download{max-width:320px}.output-panel>.hint{max-width:800px}}
@media(max-width:700px){main{padding:16px}.page-heading{display:block}.local-badge{display:inline-block;margin-top:10px}.workspace{grid-template-columns:minmax(0,1fr)}.media-panel{order:1}.preview-panel{order:2}.output-panel{order:3;grid-column:auto}.drop-zone{min-height:120px}.stage{height:260px}ol{max-height:240px}.output-panel fieldset{grid-template-columns:repeat(2,minmax(0,1fr))}.transport{flex-wrap:wrap}.transport output{margin-left:auto}.field-grid{gap:10px}.page-heading h1{font-size:24px}}
@media(max-width:540px){.header{height:60px}.nav-shell{padding:0 16px;gap:12px}.brand span{display:none}nav{gap:16px}.stage{height:225px}.panel-heading{padding:12px}.transport{padding:10px 12px}.output-panel fieldset{grid-template-columns:minmax(0,1fr)}.footer-note a{display:inline-block;margin-left:0}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
dialog{max-width:min(400px,calc(100% - 32px));border:1px solid var(--line);border-radius:14px;padding:24px;color:var(--text)}dialog::backdrop{background:rgba(17,24,39,.4)}dialog p{margin-top:12px}