.seo-content{background:#ffffffb3;border:1px solid #21372b1a;border-radius:24px;margin-top:64px;padding:36px}.seo-intro{max-width:760px}.seo-intro h2,.seo-howto h2{color:#243229;margin:7px 0 12px;font-size:clamp(1.45rem,3vw,2rem);line-height:1.25}.seo-intro p,.seo-feature-grid p,.seo-howto li{color:#66716a;line-height:1.75}.seo-intro p{margin:0}.seo-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:28px;display:grid}.seo-feature-grid article{background:#f8faf7;border-radius:16px;padding:20px}.seo-feature-grid h3{color:#2f4938;margin:0 0 8px;font-size:1rem}.seo-feature-grid p{margin:0;font-size:.92rem}.seo-howto{border-top:1px solid #e1e7e1;margin-top:32px;padding-top:28px}.seo-howto ol{margin:0;padding-left:1.3rem}.seo-howto li+li{margin-top:7px}@media (width<=700px){.seo-content{margin-top:36px;padding:24px}.seo-feature-grid{grid-template-columns:1fr}}@media print{.seo-content{display:none!important}}:root{color:#1c2732;font-synthesis:none;text-rendering:optimizelegibility;background:#f4f6f2;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{background:radial-gradient(circle at 15% 0,#deebd6d9,#0000 34rem),#f4f6f2;min-width:320px;min-height:100vh;margin:0}button,textarea{font:inherit}button:focus-visible,textarea:focus-visible,a:focus-visible{outline-offset:3px;outline:3px solid #356b4e52}.app-shell{width:min(1180px,100% - 32px);margin:0 auto;padding:72px 0 40px}.hero{max-width:760px;margin-bottom:36px}.eyebrow,.panel-kicker{color:#50705e;letter-spacing:.15em;margin:0;font-size:.76rem;font-weight:750}h1{letter-spacing:-.055em;margin:10px 0 14px;font-size:clamp(2.4rem,7vw,5rem);line-height:1.02}.subtitle{color:#65706a;max-width:650px;margin:0;font-size:clamp(1rem,2vw,1.16rem);line-height:1.75}.workspace{grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:18px;display:grid}.panel{-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#ffffffdb;border:1px solid #21372b1f;border-radius:24px;min-width:0;box-shadow:0 22px 55px #263a2e12}.editor-panel,.reader-panel{padding:26px}.panel-header{justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:20px;display:flex}.panel-header h2{margin:5px 0 0;font-size:1.18rem}.character-count,.local-badge{color:#6b746f;flex:none;font-size:.82rem}.local-badge{color:#356b4e;background:#e9f4eb;border-radius:999px;padding:6px 10px;font-weight:650}textarea{resize:vertical;color:#1f2923;background:#fbfcfa;border:1px solid #dce2dc;border-radius:16px;width:100%;min-height:340px;padding:18px;font-size:1.03rem;line-height:1.8;transition:border-color .16s,box-shadow .16s;display:block}textarea:hover{border-color:#c8d2ca}textarea:focus{border-color:#86a895;box-shadow:0 0 0 4px #5f89701a}.toolbar{gap:10px;margin-top:16px;display:flex}.button{cursor:pointer;border:0;border-radius:999px;padding:10px 16px;font-weight:680}.button-secondary{color:#f8fbf8;background:#356b4e}.button-secondary:hover:not(:disabled){background:#2c5d42}.button-ghost{color:#56615a;background:#edf0ec}.button-ghost:hover:not(:disabled){background:#e4e8e3}.button:disabled{cursor:not-allowed;opacity:.48}.button-compact{padding:7px 12px;font-size:.82rem}.reader-controls{flex-wrap:wrap;gap:16px;margin:-4px 0 0;display:flex}.control-group{border:0;align-items:center;gap:9px;min-width:0;margin:0;padding:0;display:flex}.control-group legend{float:left;color:#69736d;margin-right:9px;font-size:.78rem;font-weight:650}.segmented-control{background:#edf0ec;border-radius:999px;padding:3px;display:inline-flex}.segment-button{color:#5e6962;cursor:pointer;background:0 0;border:0;border-radius:999px;min-width:42px;padding:6px 10px;font-size:.78rem;font-weight:680}.segment-button:hover{color:#324c3c}.segment-button[aria-pressed=true]{color:#294c38;background:#fff;box-shadow:0 1px 4px #233a2b1f}.reader-actions{flex-wrap:wrap;justify-content:flex-end;gap:8px;margin:16px 0 14px;display:flex}.reader-hint{color:#7a847e;margin:2px 0 12px;font-size:.78rem;line-height:1.5}.reader-output{--reader-font-size:clamp(1.55rem, 2.8vw, 2.05rem);--reader-line-height:2.35;--reader-hidden-line-height:1.9;background:#fbfcfa;border-radius:16px;min-height:394px;padding:30px 26px}.reader-size-small{--reader-font-size:clamp(1.3rem, 2.3vw, 1.65rem)}.reader-size-large{--reader-font-size:clamp(1.9rem, 3.4vw, 2.55rem)}.reader-spacing-compact{--reader-line-height:1.95;--reader-hidden-line-height:1.65}.reader-spacing-relaxed{--reader-line-height:2.75;--reader-hidden-line-height:2.15}.pinyin-text{font-family:Noto Serif SC,Songti SC,SimSun,serif;font-size:var(--reader-font-size);line-height:var(--reader-line-height);word-break:break-word;margin:0;transition:font-size .14s,line-height .14s}ruby{ruby-align:center;margin-inline:.08em}rt{color:#50705e;letter-spacing:.01em;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:.43em;font-weight:620}.hanzi-speak-trigger{color:inherit;cursor:pointer;font-family:inherit;font-size:inherit;background:0 0;border:0;border-radius:.12em;padding:0 .02em;line-height:1;display:inline}.hanzi-speak-trigger:hover{color:#245c3b;background:#edf5ef}.hanzi-speak-trigger:focus-visible{outline-offset:2px;outline-width:2px}.polyphonic-trigger{color:inherit;cursor:pointer;font-family:inherit;font-size:inherit;background:0 0;border:0;border-bottom:1px dashed #94aa9c;border-radius:.12em;padding:0 .02em;line-height:1;display:inline}.polyphonic-trigger:hover{color:#245c3b;background:#edf5ef}.polyphonic-trigger[aria-pressed=true]{color:#245c3b;background:#e1eee4;border-bottom-style:solid}.polyphonic-trigger:focus-visible{outline-offset:2px;outline-width:2px}.pinyin-hidden{line-height:var(--reader-hidden-line-height)}.non-chinese{white-space:pre-wrap}.polyphonic-details{color:#26352c;background:#f0f6f1;border:1px solid #d9e6dc;border-radius:16px;grid-template-columns:auto minmax(0,1fr);gap:18px;margin-top:24px;padding:18px 44px 18px 18px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:.92rem;line-height:1.5;display:grid;position:relative}.polyphonic-character{color:#244d35;background:#fff;border-radius:14px;place-items:center;width:58px;height:58px;font-family:Noto Serif SC,Songti SC,SimSun,serif;font-size:2rem;line-height:1;display:grid;box-shadow:0 2px 10px #233a2b14}.polyphonic-detail-content{min-width:0}.detail-label{color:#708078;letter-spacing:.04em;margin:0;font-size:.74rem;font-weight:700}.detail-current{color:#285c3d;margin:2px 0 12px;font-size:1.22rem;font-weight:760}.alternative-pronunciations{flex-wrap:wrap;align-items:center;gap:8px 12px;display:flex}.pronunciation-list{flex-wrap:wrap;gap:6px;display:flex}.pronunciation-chip{color:#4e6256;background:#fff;border:1px solid #d5e2d8;border-radius:999px;padding:4px 9px;font-size:.82rem;font-weight:650}.detail-speech-button{color:#315e42;cursor:pointer;background:#fff;border:1px solid #cbdccf;border-radius:999px;margin:12px 0;padding:6px 11px;font-size:.8rem;font-weight:680}.detail-speech-button:hover{background:#e8f1ea}.detail-note{color:#7a867f;margin:12px 0 0;font-size:.76rem}.polyphonic-close{color:#6d7b73;cursor:pointer;background:0 0;border:0;border-radius:999px;width:30px;height:30px;padding:0;font-size:1.25rem;line-height:1;position:absolute;top:10px;right:10px}.polyphonic-close:hover{color:#31493b;background:#e4eee6}.empty-state{color:#8a928d;margin:0;line-height:1.7}footer{color:#78817b;text-align:center;margin-top:24px;font-size:.86rem}footer a{color:#4b6f5a}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (width<=800px){.app-shell{width:min(100% - 20px,720px);padding-top:44px}.workspace{grid-template-columns:1fr}textarea{min-height:230px}.reader-output{min-height:260px}}@media (width<=520px){.reader-controls{gap:12px}.control-group{justify-content:space-between;width:100%}.reader-actions{justify-content:flex-start}.polyphonic-details{grid-template-columns:1fr;gap:12px}.polyphonic-character{width:52px;height:52px;font-size:1.8rem}}@media print{@page{margin:16mm}:root,body{color:#000;background:#fff}.app-shell{width:auto;margin:0;padding:0}.hero,.editor-panel,.reader-panel>.panel-header,.reader-controls,.reader-actions,.reader-hint,.polyphonic-details,footer{display:none!important}.workspace{display:block}.reader-panel{box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:#fff;border:0;border-radius:0;padding:0}.reader-output{background:#fff;min-height:0;padding:0}.pinyin-text,rt{color:#000}.hanzi-speak-trigger,.polyphonic-trigger,.polyphonic-trigger[aria-pressed=true]{color:inherit;background:0 0;border:0;padding:0}}