:root { --canvas:#f2f4ef; --surface:#fff; --ink:#151816; --muted:#687068; --line:#d8ddd6; --accent:#168143; --accent-soft:#e7f3ea; --dark:#171a18; font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; color:var(--ink); background:var(--canvas); font-synthesis:none; }
* { box-sizing:border-box; }
html { min-width:320px; background:var(--canvas); }
body { min-width:320px; margin:0; background:var(--canvas); color:var(--ink); }
button,input,select { font:inherit; }
button,a { -webkit-tap-highlight-color:transparent; }
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible { outline:2px solid var(--accent); outline-offset:2px; }
.skip-link { position:fixed; z-index:100; top:8px; left:8px; padding:9px 12px; background:var(--ink); color:#fff; transform:translateY(-150%); }.skip-link:focus{transform:none}
.eyebrow { margin:0; color:var(--accent); font-size:10px; font-weight:850; letter-spacing:.12em; }
.lab-shell { width:min(1540px,100%); margin:0 auto; padding:24px 28px 64px; }
.lab-intro { display:grid; grid-template-columns:minmax(0,1.05fr) minmax(320px,.95fr); gap:clamp(34px,5vw,64px); align-items:start; padding:24px 0 28px; }
.lab-intro-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.lab-intro-actions a{display:inline-flex;min-height:36px;align-items:center;padding:0 12px;border-radius:7px;font-size:10px;font-weight:800;text-decoration:none}.lab-intro-actions .secondary-action{border:1px solid var(--line);background:var(--surface);color:var(--ink)}.lab-intro-actions .primary-action{border:1px solid var(--dark);background:var(--dark);color:#fff}
.lab-intro h1 { max-width:560px; margin:14px 0 0; font-size:clamp(40px,4vw,58px); line-height:1.02; letter-spacing:-.055em; }.lab-intro h1 em{color:var(--accent);font-style:normal}.intro-copy{max-width:560px;padding-top:14px}.intro-copy>p{max-width:48ch;margin:0;color:#59645c;font-size:13px;line-height:1.75}.concept-legend{display:grid;grid-template-columns:repeat(3,1fr);margin-top:20px;border:1px solid var(--line);border-radius:12px;background:var(--surface);overflow:hidden}.concept-legend button{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:10px;min-height:60px;padding:10px 14px;border:0;border-right:1px solid var(--line);background:transparent;color:var(--ink);text-align:left;cursor:pointer}.concept-legend button:last-child{border-right:0}.concept-legend button:hover{background:var(--accent-soft)}.concept-legend i{color:var(--accent);font-size:9px;font-style:normal;font-weight:800}.concept-legend span{display:grid;gap:3px}.concept-legend strong{font-size:11px;font-weight:800}.concept-legend small{color:#6f796f;font-size:8px}
.project-composer,.workspace,.decision-panel{border:1px solid var(--line);border-radius:16px;background:var(--surface);box-shadow:0 12px 30px rgba(35,42,36,.04)}
.project-composer{margin-top:4px;padding:22px}.project-composer>header{display:flex;align-items:end;justify-content:space-between;gap:24px;padding-bottom:16px;border-bottom:1px solid var(--line)}.project-composer h2,.workspace h2,.decision-panel h2{margin:5px 0 0;font-size:20px}.project-name{display:grid;gap:6px}.project-name span,.selector-grid label>span,.fine-controls legend{color:var(--muted);font-size:10px;font-weight:750}.project-name input{width:230px;height:38px;padding:0 11px;border:1px solid var(--line);border-radius:7px;background:#fbfcfa;color:var(--ink);font-weight:700}.project-origin{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:12px;margin-top:16px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#f7f9f6}.project-origin>span{color:var(--muted);font-size:9px;font-weight:800;letter-spacing:.08em}.project-origin>strong{min-width:0;overflow:hidden;font-size:11px;text-overflow:ellipsis;white-space:nowrap}.project-origin>div{display:flex;gap:12px}.project-origin a{color:var(--accent);font-size:10px;font-weight:800;text-decoration:none}.project-origin a:hover{text-decoration:underline}
.selector-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:18px;border:1px solid var(--line);border-radius:10px;overflow:hidden}.selector-grid label{display:grid;gap:9px;min-width:0;padding:16px;border-right:1px solid var(--line);background:#fff}.selector-grid label:last-child{border-right:0}.selector-grid label>span{color:var(--ink);font-size:11px}.selector-grid label>span b{display:inline-grid;width:22px;height:22px;margin-right:6px;place-items:center;border-radius:50%;background:var(--accent-soft);color:var(--accent);font-size:8px}.selector-grid select{width:100%;height:42px;padding:0 34px 0 10px;border:1px solid #bdc5bd;border-radius:7px;background:var(--surface);color:var(--ink);font-size:13px;font-weight:750}.selector-grid small{min-height:28px;color:var(--muted);font-size:9px;line-height:1.5}
.fine-controls{display:grid;grid-template-columns:1.4fr .7fr .5fr;gap:22px;margin-top:20px}.fine-controls fieldset{display:grid;gap:9px;margin:0;padding:0;border:0}.intensity-options,.compact-options{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}.intensity-options button,.compact-options button{min-height:38px;flex:1;padding:0 10px;border:0;border-right:1px solid var(--line);background:#fbfcfa;color:var(--muted);font-size:10px;font-weight:750;cursor:pointer}.intensity-options button:last-child,.compact-options button:last-child{border-right:0}.intensity-options button.is-active,.compact-options button.is-active{background:var(--dark);color:#fff}.selection-sentence{margin:20px 0 0;padding:12px 14px;border-left:3px solid var(--accent);background:var(--accent-soft);color:#315e3d;font-size:12px;font-weight:700}
.selection-overview{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:12px}.selection-overview article{display:grid;align-content:start;gap:7px;min-height:112px;padding:14px;border:1px solid var(--line);border-radius:10px;background:#fbfcfa}.selection-overview article>span{color:var(--accent);font-size:8px;font-weight:850;letter-spacing:.12em}.selection-overview strong{overflow:hidden;font-size:13px;line-height:1.3;text-overflow:ellipsis;white-space:nowrap}.selection-overview small{color:var(--muted);font-size:9px;line-height:1.5}.theme-swatches{display:flex;gap:5px;margin:1px 0}.theme-swatches i{width:24px;height:24px;border:1px solid rgba(0,0,0,.08);border-radius:6px;background:var(--swatch)}
.workspace{margin-top:18px;overflow:hidden}.workspace-bar{display:grid;grid-template-columns:minmax(160px,1fr) auto minmax(280px,1fr);align-items:center;gap:18px;padding:18px 20px;border-bottom:1px solid var(--line)}.view-controls{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}.view-controls button{min-height:38px;padding:0 14px;border:0;border-right:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:10px;font-weight:750;cursor:pointer}.view-controls button:last-child{border-right:0}.view-controls button.is-active{background:var(--accent-soft);color:var(--accent)}.workspace-actions{display:flex;justify-content:flex-end;gap:8px}.primary-action,.secondary-action{min-height:40px;padding:0 14px;border-radius:7px;font-size:10px;font-weight:800;cursor:pointer}.primary-action{border:1px solid var(--dark);background:var(--dark);color:#fff}.primary-action span{margin-left:18px}.secondary-action{border:1px solid var(--line);background:var(--surface);color:var(--ink)}
.compare-picker{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:12px 20px;border-bottom:1px solid var(--line);background:#f8faf7}.compare-picker>div:first-child{display:grid;gap:3px}.compare-picker strong{font-size:11px}.compare-picker span{color:var(--muted);font-size:9px}.compare-picker>div:last-child{display:flex;flex-wrap:wrap;gap:6px}.compare-picker button{min-height:30px;padding:0 10px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--muted);font-size:9px;font-weight:750;cursor:pointer}.compare-picker button.is-selected{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.preview-stage{display:flex;min-height:620px;justify-content:center;gap:14px;padding:18px;background:linear-gradient(180deg,#edf0eb,#e6e9e4);overflow:auto}.preview-column{display:flex;min-width:0;flex:1 1 0;flex-direction:column}.preview-column>header{display:flex;min-height:52px;align-items:center;justify-content:space-between;gap:10px;padding:8px 12px;border:1px solid var(--line);border-bottom:0;background:var(--surface)}.preview-column>header div{display:grid;gap:3px}.preview-column>header strong{font-size:11px}.preview-column>header span{color:var(--muted);font-size:8px}.preview-column>header b{padding:4px 6px;border-radius:4px;background:var(--accent-soft);color:var(--accent);font-size:8px}.device-frame{position:relative;width:min(var(--preview-width),100%);height:var(--preview-height);margin:0 auto;border:1px solid #bdc4bc;background:#fff;overflow:hidden;box-shadow:0 14px 36px rgba(27,35,29,.08)}.device-frame iframe{width:var(--preview-width);height:var(--preview-height);border:0;background:#fff;transform:scale(var(--preview-scale,1));transform-origin:top left}.preview-stage.device-iphone .preview-column,.preview-stage.device-android .preview-column{max-width:430px}.preview-stage.device-iphone .device-frame,.preview-stage.device-android .device-frame{border:8px solid #1c1f1d;border-radius:28px}.preview-stage.is-compare{justify-content:flex-start}.preview-stage.is-compare .preview-column{min-width:390px}
.difference-panel{padding:20px;overflow:auto}.difference-panel table{width:100%;min-width:760px;border-collapse:collapse;font-size:11px}.difference-panel th,.difference-panel td{padding:13px;border:1px solid var(--line);text-align:left}.difference-panel th{background:#f5f7f3}.difference-panel td:first-child{color:var(--muted);font-weight:750}.difference-panel strong{display:block;margin-bottom:3px}
.decision-panel{display:grid;grid-template-columns:260px minmax(0,1fr) 300px;align-items:start;gap:24px;margin-top:18px;padding:22px}.decision-panel dl{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:0}.decision-panel dl div{min-height:88px;padding:12px;border:1px solid var(--line);border-radius:8px;background:#fbfcfa}.decision-panel dt{color:var(--muted);font-size:9px}.decision-panel dd{margin:7px 0 0;font-size:11px;font-weight:750;line-height:1.5}.vocab-assist{padding-left:22px;border-left:1px solid var(--line)}.vocab-assist>span{color:var(--accent);font-size:9px;font-weight:850}.vocab-assist p{margin:7px 0 10px;color:var(--muted);font-size:10px;line-height:1.5}.vocab-assist div{display:flex;flex-wrap:wrap;gap:6px}.vocab-assist button{min-height:28px;padding:0 8px;border:1px solid var(--line);border-radius:999px;background:var(--surface);font-size:9px;cursor:pointer}.vocab-assist button:hover{border-color:var(--accent);color:var(--accent)}
.explain-dialog{width:min(520px,calc(100% - 30px));padding:0;border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);box-shadow:0 30px 80px rgba(0,0,0,.22)}.explain-dialog::backdrop{background:rgba(18,22,19,.48);backdrop-filter:blur(3px)}.explain-dialog form{position:absolute;top:10px;right:10px}.explain-dialog form button{width:36px;height:36px;border:0;border-radius:50%;background:#f1f3ef;font-size:20px;cursor:pointer}#explainContent{padding:34px}#explainContent h2{margin:7px 0 12px;font-size:26px}#explainContent p{color:var(--muted);line-height:1.7}#explainContent ul{padding-left:18px;color:var(--muted);font-size:12px;line-height:1.8}
.toast{position:fixed;z-index:60;right:18px!important;bottom:18px!important;left:auto!important;top:auto!important;padding:11px 14px;border:1px solid #b9d8c3;border-radius:9px;background:#e8f8e9;color:#145b35;font-size:12px;font-weight:700;box-shadow:0 10px 30px rgba(0,0,0,.16)}
@media(max-width:1100px){.lab-intro{grid-template-columns:1fr;gap:28px}.selector-grid{grid-template-columns:repeat(2,1fr)}.selector-grid label:nth-child(2){border-right:0}.selector-grid label:nth-child(-n+2){border-bottom:1px solid var(--line)}.selection-overview{grid-template-columns:repeat(2,1fr)}.workspace-bar{grid-template-columns:1fr auto}.workspace-actions{grid-column:1/-1;justify-content:flex-start}.decision-panel{grid-template-columns:1fr}.decision-panel dl{grid-template-columns:repeat(4,1fr)}.vocab-assist{padding:18px 0 0;border-top:1px solid var(--line);border-left:0}}
@media(max-width:720px){.lab-shell{padding:22px 14px 50px}.lab-intro{padding-top:18px}.lab-intro h1{font-size:46px}.concept-legend{grid-template-columns:1fr}.concept-legend button{border-right:0;border-bottom:1px solid var(--line)}.project-composer{padding:16px}.project-composer>header{align-items:stretch;flex-direction:column}.project-name input{width:100%}.project-origin{grid-template-columns:1fr}.project-origin>div{flex-wrap:wrap}.selector-grid{grid-template-columns:1fr}.selector-grid label{border-right:0!important;border-bottom:1px solid var(--line)}.fine-controls{grid-template-columns:1fr}.selection-overview{grid-template-columns:1fr}.workspace-bar{grid-template-columns:1fr}.view-controls{overflow-x:auto}.workspace-actions{flex-direction:column}.compare-picker{align-items:flex-start;flex-direction:column}.preview-stage{min-height:560px;padding:10px}.preview-stage.is-compare{justify-content:flex-start}.decision-panel dl{grid-template-columns:repeat(2,1fr)}.primary-action,.secondary-action{min-height:44px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}
:root{--display-font:Inter,"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif}.lab-intro h1,.project-composer h2,.workspace h2,.decision-panel h2{font-family:var(--display-font);font-weight:850;letter-spacing:-.055em}