:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;color:#123c32;background:#fff;font-synthesis:none;--ink: #123c32;--muted: #405b55;--line: #dfe9e6;--mint: #edf8f1;--green: #1f6454}*{box-sizing:border-box}body{margin:0;min-width:320px;font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}a{color:inherit;text-decoration:none}button,select,textarea{font:inherit;color:inherit}button,a,summary{-webkit-tap-highlight-color:transparent}button,select,summary{cursor:pointer}:focus-visible{outline:3px solid #257861;outline-offset:3px}button,select,textarea,.reading-surface{border:1px solid var(--line);border-radius:8px;background:#fff}button{min-height:44px;padding:8px 20px;font-size:15px;font-weight:600}button:hover:not(:disabled){background:var(--mint)}button:disabled,select:disabled{background:#f2f5f4;color:#6a7974;cursor:not-allowed}svg{width:20px;height:20px;flex-shrink:0}.site-header{max-width:980px;min-height:78px;margin:auto;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:11px;align-items:center}.brand img{width:42px;height:42px;border-radius:7px}.brand-copy{display:flex;flex-direction:column;line-height:1.15}.brand-copy strong{font:700 17px Georgia,Times New Roman,serif}.brand-copy small{font-size:11px;color:var(--muted);letter-spacing:.18em;margin-top:4px}.brand-links{display:flex;gap:8px}.brand-links a{display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--line);border-radius:8px}.brand-links a:hover{background:var(--mint)}.hero{max-width:900px;margin:26px auto 22px;padding:22px 24px;text-align:center;background:var(--mint);border-radius:8px}.hero{display:grid;grid-template-columns:minmax(160px,1fr) auto minmax(160px,1fr);align-items:center;gap:12px}.hero-title{grid-column:2;min-width:0}.ai-version-link{grid-column:3;justify-self:end;display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:9px 12px;border:1px solid #b7d4c7;border-radius:8px;color:var(--green);text-align:left;transition:background .15s ease,color .15s ease}.ai-version-link strong{display:block;font-size:14px;font-weight:600;line-height:1.5}.ai-version-link small{display:block;font-size:11px;line-height:1.5}.ai-version-link:hover{background:var(--green);border-color:var(--green);color:#fff}h1{font-size:clamp(25px,3vw,34px);font-weight:650;line-height:1.4;margin:0}.hero-english{margin:5px 0 0;font:20px/1.4 Georgia,Times New Roman,serif}.container{max-width:948px;padding:0 24px;margin:auto}.passage-picker{display:grid;grid-template-columns:minmax(120px,1fr) minmax(0,2fr) auto;align-items:center;gap:12px;margin-bottom:16px}.passage-picker>div{min-width:0}select{width:100%;min-width:0;min-height:46px;padding:10px 12px;font-size:16px;text-overflow:ellipsis}textarea,.reading-surface{width:100%;min-height:220px;padding:22px 24px;display:block;font-size:22px;line-height:1.9;overflow-wrap:anywhere}textarea{resize:none;overflow-y:hidden}textarea::placeholder{color:#62716d;font-size:16px}textarea:read-only{background:#fbfdfc}.reading-surface{overflow-y:hidden}textarea[data-scroll=true],.reading-surface[data-scroll=true]{max-height:480px;overflow-y:auto}#pinyinOutput{white-space:pre-wrap;font-size:22px;line-height:2}#pinyinOutput ruby{display:inline-flex;flex-direction:column-reverse;align-items:center;min-width:1.5em;margin:0 .06em .25em;vertical-align:bottom;line-height:1.35}#pinyinOutput rt{display:block;font-family:inherit;font-size:12px;font-weight:500;color:var(--muted);line-height:1.4;text-align:center}.passage-status{color:var(--muted);font-size:14px;white-space:pre-line;margin:10px 0}.retry-passages{margin-bottom:12px}.controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap}#demoBtn{display:inline-flex;align-items:center;gap:8px}#demoBtn[data-playing=true]{background:#153f37;border-color:#153f37;color:#fff}#demoBtn[data-playing=true]:hover:not(:disabled){background:#1f6454}#pinyinBtn{display:inline-flex;align-items:center;gap:12px;border-color:transparent;padding:8px 0 8px 8px;background:none;font-weight:500}.switch-track{display:inline-block;position:relative;width:46px;height:26px;border-radius:20px;background:#75857f;transition:background .15s ease}.switch-track:after{content:"";position:absolute;width:20px;height:20px;left:3px;top:3px;border-radius:50%;background:#fff;transition:transform .15s ease}#pinyinBtn[aria-checked=true] .switch-track{background:#257861}#pinyinBtn[aria-checked=true] .switch-track:after{transform:translate(20px)}.reading-bar{margin-top:18px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}#startBtn{background:#153f37;color:#fff;border-color:#153f37}#startBtn:hover:not(:disabled){background:#1f6454}#startBtn:disabled{background:#f2f5f4;border-color:var(--line);color:#6a7974}#stopBtn:not(:disabled){background:#913f35;border-color:#913f35;color:#fff}#stopBtn:hover:not(:disabled){background:#733129}#cancelBtn{font-weight:400}#timerContainer{color:var(--muted);font-size:16px}#timer{font:27px Georgia,serif;color:var(--ink);margin-right:4px;font-variant-numeric:tabular-nums}#timerMessage{display:none;color:#913f35;font-size:14px}.microphone-note{font-size:13px;line-height:1.6;color:var(--muted);margin:14px 0 24px}#transcriptContainer,#differencesContainer,#resultContainer{padding:22px 0;border-top:1px solid var(--line)}h2{font-size:21px;font-weight:600;line-height:1.5;margin:0}h2 span{display:inline-block;font:17px/1.5 Georgia,serif;color:var(--muted);margin-left:10px}#transcript{white-space:pre-wrap;overflow-wrap:anywhere;margin-top:12px}#report{overflow-wrap:anywhere}.report-legend{display:flex;flex-wrap:wrap;gap:8px 18px;margin:16px 0;font-size:13px}.legend-mismatch{border-bottom:2px solid #ad6720}.legend-omission{border-bottom:2px dashed #376d92}.legend-addition{color:#69528d}.annotated-passage{white-space:pre-wrap;font-size:22px;line-height:2.25;margin:20px 0;padding:18px;border:1px solid var(--line);border-radius:8px}.report-mark{display:inline;min-height:0;padding:3px 1px;margin:0;font:inherit;line-height:inherit;border:0;border-radius:3px;box-decoration-break:clone;-webkit-box-decoration-break:clone}.mark-mismatch{background:#fff0d8;color:#74420e;text-decoration:underline solid #ad6720;text-underline-offset:5px}.mark-omission{background:#e5f1fa;color:#245776;text-decoration:underline dashed #376d92;text-underline-offset:5px}.mark-addition{display:inline-block;background:#eee8f7;color:#60437c;padding:0 5px;font-size:18px;line-height:1.8;vertical-align:baseline}.report-mark:hover:not(:disabled),.report-mark[aria-pressed=true]{outline:2px solid var(--green);outline-offset:2px}.mark-mismatch:hover:not(:disabled){background:#fff0d8}.mark-omission:hover:not(:disabled){background:#e5f1fa}.mark-addition:hover:not(:disabled){background:#eee8f7}.issue-detail{padding:14px 18px;border-left:3px solid #bfe5d4;background:#f7fbf8;font-size:15px;overflow-wrap:anywhere;scroll-margin:16px}#report .issue-detail p{margin:5px 0 0}.issue-context{color:var(--muted)}#transcriptContainer summary,#differencesContainer summary{cursor:pointer}#transcriptContainer summary h2,#differencesContainer summary h2{display:inline}#report:empty,#transcript:empty,#differences:empty{min-height:20px}#differences{overflow-wrap:anywhere;margin-top:12px}#report p{margin:10px 0}.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:18px 0}#report .metric{background:var(--mint);border-radius:8px;padding:14px 8px;text-align:center;margin:0}.metric strong{display:block;font-size:14px;font-weight:400;color:var(--muted)}.metric small{display:block;font-size:12px;line-height:1.5;font-weight:400;color:var(--muted)}.metric span{display:block;font-size:22px;font-weight:600;margin-top:5px}h3{font-size:18px;margin:20px 0 8px}ul{padding-left:24px}.information{border-top:1px solid var(--line);padding-top:18px}.help-section{border:1px solid var(--line);border-radius:8px;margin-bottom:10px}.help-section summary{display:flex;align-items:center;justify-content:space-between;gap:12px;list-style:none;padding:13px 18px}.help-section summary::-webkit-details-marker{display:none}.help-section summary:hover{background:#f7fbf8}.help-section summary h2{font-size:18px;font-weight:550}.help-section h2 span{display:block;margin:2px 0 0;font-size:15px}.help-section[open] summary svg{transform:rotate(90deg)}.help-content{padding:0 18px 18px;font-size:15px}.help-content p{margin:12px 0 0}.help-content ol{padding-left:22px}.help-content li{margin-bottom:12px}.translation{display:block;color:var(--muted);line-height:1.65;margin-top:5px}.assessment-note{border-left:3px solid #bfe5d4;padding-left:14px}.page-footer{text-align:center;color:var(--muted);font:13px Georgia,serif;padding:22px 0 30px}@media(max-width:950px){.hero{margin-left:24px;margin-right:24px}}@media(max-width:820px){.hero{grid-template-columns:minmax(0,1fr)}.hero-title,.ai-version-link{grid-column:1}}@media(max-width:620px){.site-header{padding:12px 16px;gap:8px;min-height:68px;flex-wrap:wrap}.brand{gap:8px}.brand img{width:34px;height:34px}.brand-copy strong{font-size:15px}.brand-copy small{font-size:10px}.brand-links{gap:3px}.hero{margin:18px 16px;padding:20px 14px}.hero-english{font-size:17px}.container{padding:0 16px}.passage-picker{grid-template-columns:minmax(0,1fr) auto;gap:10px}.passage-picker>div:nth-child(2){grid-row:2;grid-column:1 / -1}#pinyinBtn{grid-column:2;grid-row:1}textarea,.reading-surface{padding:18px 16px;min-height:240px}.reading-bar{gap:10px}.recording-controls{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1fr);width:100%;gap:6px}.recording-controls button{padding:9px 3px;font-size:13px;line-height:1.35;min-height:48px;justify-content:center}#demoBtn{gap:4px}#demoBtn svg{width:15px;height:15px}#timerContainer{margin-left:auto}h2{font-size:20px}h2 span{display:block;margin:2px 0 0}.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.help-section summary{padding:12px 14px}}@media(max-width:380px){.brand-links{margin-left:auto}.brand-copy strong{font-size:14px}.site-header{gap:10px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important}}.shell{width:min(1180px,calc(100% - 40px));margin:0 auto}.site-header,.site-footer,#socialDialog{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.5}.site-header{position:sticky;top:0;z-index:50;max-width:none;margin:0;padding:0;display:block;min-height:0;background:#fff;border-bottom:1px solid rgba(23,53,47,.08);color:#17352f}.nav-shell{height:78px;display:flex;align-items:center;justify-content:space-between;gap:20px}.site-header .brand{gap:11px}.site-header .brand img{width:42px;height:42px;display:block;object-fit:cover;border-radius:7px}.site-header .brand-copy{line-height:1.1}.site-header .brand-copy strong{font:700 17px/1.1 Georgia,Times New Roman,serif;letter-spacing:-.2px}.site-header .brand-copy small{margin-top:4px;color:#62716d;font-size:11px;letter-spacing:.18em}.desktop-nav{display:flex;align-items:center;gap:7px}.nav-link{display:flex;align-items:center;gap:3px;padding:9px 13px;color:#53635f;font-size:14px;font-weight:500;transition:color .2s ease}.nav-link:hover,.nav-link.active{color:#1f6454}.nav-link.active{text-decoration:underline;text-decoration-color:#ffe15a;text-decoration-thickness:2px;text-underline-offset:8px}.external-mini{width:13px;height:13px}.menu-button{display:none;width:42px;height:42px;min-height:42px;border:0;background:#edf2ed;border-radius:12px;padding:10px}.mobile-nav{display:none}.site-footer{margin-top:30px;border-top:1px solid #dfe4dd;background:#fff;color:#17352f}.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:26px 0}.footer-brand-wrap{display:flex;align-items:center;gap:11px}.footer-logo{display:grid;place-items:center;min-width:44px;min-height:44px}.footer-logo img{border-radius:10px}.footer-brand{font:700 17px/1.5 Georgia,serif}.footer-brand span{color:#1f6454}.footer-meta{text-align:right}.footer-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px 17px}.footer-links a{display:inline-flex;align-items:center;color:#62716d;font-size:11px;font-weight:700}.footer-links a:hover{color:#1f6454}.copyright{padding-top:8px;color:#89948f;font-size:9px;letter-spacing:.08em;text-transform:uppercase}.footer-social-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 22px}.footer-social-links button{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0;border:0;border-radius:0;background:transparent;color:#62716d;font-size:14px;font-weight:500;transition:color .18s ease,transform .18s ease}.footer-social-links svg{width:22px;height:22px}.footer-social-links [data-social=youtube] svg{color:#d86646}.footer-social-links [data-social=tiktok] svg{color:#584c75}.footer-social-links [data-social=xiaohongshu] svg{color:#9c6a16}.footer-social-links button:hover{background:transparent;transform:translateY(-2px);color:#1f6454}#socialDialog{position:fixed;border:0;max-height:calc(100dvh - 40px);overflow-y:auto;color:#17352f;background:#fffefa;box-shadow:0 30px 80px #00000040}#socialDialog::backdrop{background:#0f231e99;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.channel-modal{width:min(520px,calc(100% - 40px));padding:34px;border-radius:28px}.qr-modal{width:min(460px,calc(100% - 40px));padding:31px;border-radius:28px;text-align:center}#socialDialog .eyebrow{color:#1f6454;font-size:11px;font-weight:800;letter-spacing:.16em;text-transform:uppercase}#socialDialog h2{margin:9px 42px 5px 0;font:500 30px/1.12 Georgia,serif}#socialDialog.qr-modal h2{margin:9px 0 3px;font-size:28px}#socialContent>p{margin:0;color:#62716d;font-size:13px}.modal-close{position:absolute;top:15px;right:15px;width:38px;height:38px;min-height:38px;padding:10px;border:0;border-radius:50%;background:#eef1ed;display:grid;place-items:center}.channel-options{display:grid;gap:11px;margin-top:24px}.channel-option{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:66px;padding:14px 17px;border:1px solid #dfe4dd;border-radius:17px;background:#fbfcf8;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}.channel-option:hover,.channel-option:focus-visible{transform:translateY(-2px);border-color:#b8ccc1;box-shadow:0 10px 24px #1b372f14}.channel-option strong{font-size:14px;line-height:1.35}.channel-option svg{width:17px;height:17px;color:#1f6454}.qr-frame{width:min(310px,100%);aspect-ratio:1;margin:20px auto 14px;padding:7px;border:1px solid #dfe4dd;border-radius:21px;background:#fff}.qr-frame img{width:100%;height:100%;object-fit:cover;border-radius:14px}#socialContent .qr-help{max-width:270px;margin:0 auto 18px;line-height:1.5}.social-primary{display:flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:12px;border-radius:12px;background:#1f6454;color:#fff;font-size:14px;font-weight:600}@media(max-width:1050px){.footer-inner{flex-wrap:wrap;justify-content:center;text-align:center}.footer-meta{text-align:center}.footer-links{justify-content:center}}@media(max-width:980px){.desktop-nav{display:none}.menu-button{display:grid;place-items:center}.mobile-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;padding:5px 0 16px}.mobile-nav a{display:flex;align-items:center;justify-content:center;min-height:42px;border-radius:11px;background:#edf2ed;font-size:12px;font-weight:750}}@media(max-width:650px){.shell{width:min(1180px,calc(100% - 26px))}.nav-shell{height:68px;gap:8px}.site-header .brand img{width:38px;height:38px}.site-header .brand-copy strong{font-size:15px}.footer-inner{flex-direction:column;gap:16px}.qr-frame{width:min(290px,100%)}.channel-modal{padding:28px 22px 22px;border-radius:23px}#socialDialog.channel-modal h2{font-size:26px}}@media(prefers-reduced-motion:reduce){.footer-social-links button,.channel-option,.nav-link{transition:none}.footer-social-links button:hover,.channel-option:hover{transform:none}}.site-header .brand img{object-fit:contain;border-radius:7px;box-shadow:none}.site-header .brand-copy strong,.site-header .brand-copy small{display:block}.site-header .brand-copy strong{font:700 17px/1.1 Georgia,serif}.site-header .brand-copy small{font-size:11px;letter-spacing:normal}.site-header .nav-link{font:500 14px/21px Inter,ui-sans-serif,system-ui,sans-serif}.site-footer .footer-inner{display:flex;flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;padding:18px 0;text-align:left}.site-footer .copyright{margin:0;padding:0;color:#62716d;font-size:13px;line-height:1.5;letter-spacing:normal;text-transform:none}.site-footer .footer-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:0 18px;max-width:100%}.site-footer .footer-links a,.site-footer .footer-links button{display:inline-flex;align-items:center;min-height:44px;border:0;border-radius:0;padding:0;background:transparent;color:#62716d;font:500 14px/1.5 Inter,ui-sans-serif,system-ui,sans-serif}.site-footer .footer-links a:hover,.site-footer .footer-links button:hover{color:#1f6454}.site-footer a:focus-visible,.site-footer button:focus-visible,#brandAboutDialog a:focus-visible,#brandAboutDialog button:focus-visible{outline:2px solid #1f6454;outline-offset:3px}#brandAboutDialog{position:fixed;width:min(680px,calc(100% - 36px));max-height:calc(100dvh - 36px);overflow:auto;padding:32px;border:0;border-radius:16px;background:#fffefa;color:#17352f;font:15px/1.7 Inter,ui-sans-serif,system-ui,sans-serif}#brandAboutDialog::backdrop{background:#0f231e99}#brandAboutDialog h2{margin:0 38px 20px 0;font:500 28px/1.3 Georgia,serif}#brandAboutDialog h2 span{display:block;font:14px/1.5 system-ui,sans-serif}#brandAboutDialog h3{font:500 21px/1.4 Georgia,serif}#brandAboutDialog section+section{border-top:1px solid #dfe4dd;margin-top:20px;padding-top:12px}#brandAboutDialog .footer-social-links{justify-content:flex-start}#brandAboutDialog .modal-close{min-height:44px;width:44px;height:44px}@media(max-width:760px){.site-footer .footer-inner{flex-direction:column;align-items:flex-start}.site-footer .footer-links{justify-content:flex-start}}@media(max-width:650px){.site-header .brand img{width:38px;height:38px}.site-header .brand-copy strong{font-size:17px}#brandAboutDialog{padding:24px 18px}}