@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&display=swap');
:root{color-scheme:light;--paper:#faf9f5;--surface:#fff;--ink:#293c37;--muted:#717a73;--line:#e3e5dc;--accent:#356b58;--soft:#eaf0e8;--coral:#bd6950;--coral-soft:#fbede5;--radius:12px;--font:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:15px;line-height:1.65}button,input,select,textarea{font:inherit}button,a,summary,select{touch-action:manipulation}button,select{min-height:44px}button{border:1px solid var(--line);border-radius:10px;background:var(--surface);padding:8px 15px;color:var(--ink);cursor:pointer;line-height:1.45}button:hover{background:var(--soft);border-color:#b8c9b8}button:disabled{opacity:.4;cursor:default}button.primary{background:var(--accent);color:white;border-color:var(--accent);font-weight:600}button.primary:hover{background:#285443}button:focus-visible,a:focus-visible,summary:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #cf825f;outline-offset:3px}a{color:var(--accent);text-underline-offset:4px}h1,h2,h3,p{margin-top:0}h1{font-size:40px;line-height:1.3;letter-spacing:-.035em;margin-bottom:10px}h2{font-size:25px;margin-bottom:8px}h3{font-size:19px;margin-bottom:8px}select{appearance:auto;background:white;border:1px solid var(--line);border-radius:9px;color:var(--ink);padding:8px 32px 8px 12px;max-width:100%}textarea{width:100%;padding:14px;border:1px solid var(--line);border-radius:10px;resize:vertical;background:#fff;color:var(--ink)}[hidden]{display:none!important}.skip{position:fixed;top:-70px;z-index:50;background:white;padding:15px}.skip:focus{top:0}.site-header{display:flex;align-items:center;justify-content:space-between;padding:18px 4vw;border-bottom:1px solid var(--line);gap:20px;background:rgba(255,255,255,.85)}.brand{text-decoration:none;color:var(--ink);display:flex;gap:20px;align-items:baseline}.brand-name{font-size:24px;letter-spacing:.05em;font-weight:700}.brand-sub{color:var(--muted);font-size:14px}.header-right{display:flex;align-items:center;gap:24px;font-size:13px}.academy{font-size:10px;letter-spacing:.15em;color:var(--muted)}#word-count{margin-left:8px;font-variant-numeric:tabular-nums}.workspace{max-width:1260px;margin:0 auto;padding:40px 32px 64px;display:grid;grid-template-columns:200px minmax(0,1fr);gap:56px;align-items:start}.workspace.word-open{max-width:1540px;grid-template-columns:180px minmax(0,1fr) 300px;gap:34px}.lesson-nav{position:sticky;top:28px}.overline{text-transform:uppercase;font-size:11px;font-weight:600;letter-spacing:.13em;color:var(--muted);margin:0 0 12px;display:block}.lesson-nav select{width:100%;font-weight:600}.nav-reference{font-size:12px;color:var(--muted);margin:10px 0 34px}.nav-section-heading{font-size:12px;color:var(--muted);margin-bottom:12px}#section-nav{display:flex;flex-direction:column;gap:6px}.section-button{border:0;background:transparent;text-align:left;display:flex;gap:12px;padding:13px 10px;align-items:center;min-height:69px}.section-button[aria-current=step]{background:var(--soft)}.section-number{border:1px solid #ccd6c8;min-width:27px;height:27px;border-radius:50%;font-size:12px;display:grid;place-items:center}.section-button[aria-current=step] .section-number{background:var(--accent);color:white;border-color:var(--accent)}.section-button strong{display:block;font-size:14px;font-weight:500}.section-button small{display:block;font-size:11px;color:var(--muted);margin-top:4px}.nav-note{border-top:1px solid var(--line);padding-top:24px;margin-top:28px;font-size:12px}.nav-note strong{font-weight:500}.nav-note p{color:var(--muted);line-height:2;margin-top:7px}.progress-meta{font-size:11px;color:var(--muted);margin-top:28px}progress{display:block;width:100%;height:4px;accent-color:var(--accent);margin-top:10px}main{min-width:0}.heading-row{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:28px}.section-intro{color:var(--muted);font-size:14px;margin:0}.edition{font-size:11px;line-height:2;letter-spacing:.07em;color:var(--muted);text-align:right}.reading-toolbar{display:flex;gap:14px;align-items:center;flex-wrap:wrap}.inline-control{font-size:12px;display:flex;align-items:center;gap:7px;cursor:pointer}.inline-control input{accent-color:var(--accent);height:17px;width:17px}.tools{margin-left:auto;position:relative;font-size:12px}.tools summary{cursor:pointer;padding:12px 0;color:var(--muted)}.tools-content{position:absolute;right:0;width:265px;padding:18px;background:white;border:1px solid var(--line);border-radius:12px;box-shadow:0 16px 50px #1d30231a;z-index:8;display:flex;flex-direction:column;gap:10px}.tools-content select{display:block;width:100%;margin-top:6px}.tools-content p{font-size:11px;margin:0;color:var(--muted)}.reading-hint{font-size:11px;color:var(--muted);margin:15px 0 6px}.audio-status{font-size:12px;min-height:20px;color:var(--accent)}.verse-group{display:grid;grid-template-columns:28px 1fr;gap:12px;padding:26px 0;border-bottom:1px solid var(--line);scroll-margin-top:30px}.verse-number{font-size:12px;color:#9a9f92;font-variant-numeric:tabular-nums;padding-top:13px}.verse-content{display:flex;flex-direction:column;gap:17px;min-width:0}.language-line{display:grid;grid-template-columns:32px minmax(0,1fr);gap:12px;align-items:start}.line-controls{display:flex;flex-direction:column;align-items:center;gap:3px;padding-top:4px}.lang-code{font-size:9px;color:var(--muted)}.line-play{width:32px;min-height:32px;padding:2px;border:0;background:transparent;border-radius:50%;font-size:12px;color:var(--muted)}.line-play:hover{background:var(--soft);color:var(--accent)}.slow-verse{font-size:10px;border:0;min-height:30px;padding:4px;color:var(--muted);background:transparent}.verse-text{font-size:24px;font-weight:400;line-height:1.9;margin:0;overflow-wrap:anywhere}.verse-text.en{line-height:1.72;letter-spacing:.005em}.word{font:inherit;line-height:inherit;padding:0 1px;min-height:0;background:transparent;border:0;border-radius:4px;color:inherit;vertical-align:baseline}.word:hover{background:var(--soft);color:var(--accent)}.word.key-word{text-decoration:underline;text-decoration-color:#b9c5b2;text-decoration-thickness:1px;text-underline-offset:6px}.word.marked{background:#f4e5b9;text-decoration-color:#b19855}.word.selected{background:var(--coral-soft);color:#924c38}ruby{ruby-position:over}rt{display:none;font-size:11px;color:#83917d;font-weight:400;letter-spacing:0;line-height:1.1}.show-pinyin rt{display:ruby-text}.show-pinyin .verse-text.zh{line-height:2.65}.blank-line{width:100%;min-height:74px;background:#f1f1e9;border:1px dashed #cfd5c6;color:var(--muted);font-size:14px;text-align:left;padding:20px}.sentence-explain{font-size:12px;color:var(--muted);margin:9px 0 0 44px}.sentence-explain summary{cursor:pointer}.sentence-explain p{margin:10px 0 0;line-height:1.8}.en-pending{font-size:15px;color:var(--muted);padding:10px 0}.english-state{font-size:12px;color:var(--muted);margin-top:16px}.english-state button{font-size:12px;min-height:36px;margin-left:10px}.discussion{margin-top:46px;padding-top:30px;border-top:2px solid #ccd5c6}.discussion-lead{font-size:12px;color:var(--muted);margin-bottom:24px}.question{padding:23px 0;border-bottom:1px solid var(--line)}.question h3{font-size:18px;font-weight:500;margin-bottom:8px}.question .english-question{font-size:16px;margin:0 0 14px;color:#526154}.question details{font-size:12px;color:var(--muted)}.question summary{cursor:pointer}.question details p{background:var(--soft);padding:12px;border-radius:8px;margin-top:12px}.turn-taking{display:flex;justify-content:space-between;gap:28px;align-items:center;background:var(--soft);padding:24px;border-radius:var(--radius);margin-top:28px}.turn-taking p:last-child{margin-bottom:0;font-size:13px;color:var(--muted)}.turn-taking button{white-space:nowrap}.turn-taking .overline{font-size:10px}.my-thought{margin-top:24px;font-size:13px}.my-thought summary{cursor:pointer;margin-bottom:14px}.my-thought label{display:block;margin-bottom:9px;color:var(--muted);font-size:12px}.small{font-size:11px;color:var(--muted)}.next-row{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-top:35px}.next-row span{font-size:12px;color:var(--muted)}.credit{font-size:10px;color:var(--muted);border-top:1px solid var(--line);margin-top:42px;padding-top:20px;line-height:1.8}.credit p{margin-bottom:5px}.credit a{color:var(--muted)}.word-panel{position:sticky;top:28px;max-height:calc(100vh - 56px);overflow:auto;background:white;border:1px solid var(--line);border-radius:14px;padding:24px;min-width:0}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:20px}.panel-heading .overline{margin-bottom:0;font-size:10px}.panel-heading button{padding:0 8px;border:0;font-size:11px;min-height:36px}.word-title{font-size:31px;margin-bottom:4px}.pronunciation{font-size:13px;color:var(--muted);margin-bottom:18px}.panel-actions{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.panel-actions button{font-size:12px}.word-meaning{font-size:16px}.word-usage{font-size:13px;color:var(--muted);padding-top:18px;border-top:1px solid var(--line);line-height:1.9}.wordbook-row{width:100%;border:0;border-bottom:1px solid var(--line);border-radius:0;text-align:left;padding:14px 0;display:block}.wordbook-row span{display:block;font-size:11px;color:var(--muted)}.wordbook-empty{font-size:13px;color:var(--muted)}.panel-sentence{margin-top:22px;font-size:12px;line-height:1.9}.panel-sentence .overline{font-size:10px;margin-bottom:8px}.playing .verse-number{color:var(--accent);font-weight:bold}.playing{background:#eef3ea70}.completion{color:var(--accent);font-weight:600}
.lexeme{display:inline-block;white-space:nowrap}.verse-text.zh{overflow-wrap:normal}
@media(min-width:1450px){.workspace:not(.word-open){padding-left:24px;padding-right:24px}}
@media(max-width:1120px){.workspace{gap:28px;grid-template-columns:175px minmax(0,1fr);padding:30px 24px}.workspace.word-open{grid-template-columns:170px minmax(0,1fr);gap:28px;padding-right:350px;max-width:none}.workspace.word-open .lesson-nav{display:none}.workspace.word-open{grid-template-columns:1fr}.word-panel{position:fixed;right:20px;top:140px;width:310px;max-height:calc(100vh - 160px);z-index:12;box-shadow:0 15px 65px #2737281c}.academy{display:none}.brand-sub{display:none}}
@media(max-width:700px){.site-header{padding:13px 18px;gap:12px}.brand-name{font-size:21px}.header-right{gap:12px}.header-right>a{font-size:10px}.header-right button{font-size:12px;padding:7px 10px}.workspace,.workspace.word-open{display:block;padding:22px 18px 45px}.lesson-nav{position:static;margin-bottom:30px}.lesson-nav>label,.nav-reference,.nav-section-heading,.nav-note,.progress-meta{display:none}.lesson-nav select{max-width:100%}#section-nav{flex-direction:row;margin-top:12px;gap:6px}.section-button{flex:1;padding:10px 7px;min-width:0;min-height:60px;gap:7px}.section-button strong{font-size:11px}.section-button small{font-size:10px}.section-number{min-width:22px;height:22px;font-size:10px}.workspace.word-open .lesson-nav{display:block}h1{font-size:32px}.heading-row{margin-bottom:22px}.section-intro{font-size:12px}.reading-toolbar{gap:10px}.reading-toolbar>.primary{font-size:13px}.inline-control{font-size:11px}.tools{margin-left:0}.tools-content{right:auto;left:0}.verse-group{grid-template-columns:20px 1fr;gap:5px;padding:25px 0}.language-line{grid-template-columns:24px 1fr;gap:8px}.verse-text{font-size:22px}.verse-text.en{font-size:22px}.verse-content{gap:18px}.line-play{width:26px}.sentence-explain{margin-left:32px}.word-panel{position:fixed;top:auto;bottom:0;right:0;left:0;width:100%;max-height:72vh;border-radius:18px 18px 0 0;padding:22px 24px;z-index:25;box-shadow:0 -15px 80px #25332733}.turn-taking{padding:20px;gap:12px;flex-wrap:wrap}.turn-taking button{width:100%}.next-row{gap:8px}.next-row button{font-size:12px;padding:8px 11px}.next-row span{font-size:10px}.discussion{margin-top:30px}.question h3{font-size:17px}}
@media(prefers-reduced-motion:no-preference){button{transition:background .15s,border-color .15s}html{scroll-behavior:smooth}}
/* Product additions */
.word-picture{margin:20px 0 0}.word-picture img{display:block;width:100%;height:auto;border-radius:10px;background:#f1f1e9}.word-picture figcaption{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.7}
.credit #copyright{white-space:pre-line;margin-top:12px}.credit p{margin:8px 0 0}
.noscript{max-width:640px;margin:40px auto;padding:0 20px;font-size:16px}
/* On phones the tools panel spans the toolbar instead of hanging off its summary, which ran past a 320 px screen. */
@media(max-width:700px){.reading-toolbar{position:relative}.tools{position:static}.tools-content{left:0;right:0;width:auto}}
/* Which language comes first: one button at the top of the page, named after that language. */
.order-button{display:inline-flex;align-items:center;gap:8px;font-weight:600;color:var(--accent);background:var(--soft);border-color:#c9d8c7;white-space:nowrap}.order-button:hover{background:#dfe9dc}.order-icon{font-size:17px;line-height:1}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.reading-toolbar{border-top:1px solid var(--line);padding-top:22px}
@media(max-width:700px){.reading-toolbar{padding-top:18px}.order-button{gap:5px}.order-icon{font-size:15px}}
@media(max-width:360px){.site-header{padding:12px 14px;gap:8px}.brand-name{font-size:19px}.header-right{gap:8px}.header-right button{padding:7px 8px}}
/* "The Love Chapter" needs a little more room than 爱的篇章 in the lesson menu. */
.lesson-nav select{padding-left:10px;padding-right:26px}
/* "Language Bridge" and "Word book" are longer than 语言的桥 and 生词本: header buttons never wrap, the name may stack on phones, and the narrowest screens give the name its own row. */
.header-right button{white-space:nowrap}.section-button small{white-space:nowrap}
@media(max-width:700px){.brand-name{line-height:1.15}.header-right{flex:none}}
@media(max-width:360px){.site-header{flex-wrap:wrap;row-gap:6px}.header-right{margin-left:auto}}