:root{--paper:#f5f3ee;--ink:#202d2a;--muted:#596862;--green:#245a4c;--soft:#e8eee5;--line:#dce1d9;--gold:#c59c5d;--white:#fff;--radius:24px}
    *{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft JhengHei",sans-serif}button,input,textarea,select{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}a{color:var(--green)}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid #b87b25;outline-offset:4px}button{color:inherit}svg{display:block;max-width:100%}h1,h2,h3,p{margin:0}button svg{width:19px;height:19px;flex-shrink:0}.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}[hidden]{display:none!important}
    .review-bar{background:#203c33;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px max(24px,calc((100vw - 1200px)/2));font-size:13px}.review-bar span{opacity:.84}.review-bar strong{font-weight:600;letter-spacing:.04em}.review-bar a{color:#fff;text-decoration:none;border-bottom:1px solid #87a396;white-space:nowrap}.site-header{max-width:1200px;margin:auto;padding:23px 0;display:flex;gap:24px;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:11px;background:none;border:0;padding:0;text-align:left}.brand-mark{width:40px;height:40px;border-radius:12px;background:var(--green);color:#fff;display:grid;place-items:center;font:italic 26px Georgia,serif}.brand-title{display:block;font-weight:650;letter-spacing:-.04em;font-size:23px}.brand-caption{display:block;font-size:10px;letter-spacing:.17em;color:var(--muted);text-transform:uppercase}.top-nav{display:flex;align-items:center;gap:6px}.nav-btn{border:0;background:transparent;border-radius:10px;padding:10px 17px;font-size:14px;color:var(--muted);min-height:44px}.nav-btn[aria-current="page"]{background:var(--soft);color:var(--green);font-weight:600}.avatar{width:38px;height:38px;border:1px solid #c9d2c7;border-radius:50%;display:grid;place-items:center;background:#ebeadf;font:18px Georgia,serif}
    main{max-width:1200px;margin:0 auto;padding:40px 0 80px}.eyebrow{font-size:11px;letter-spacing:.17em;text-transform:uppercase;font-weight:700;color:var(--green)}.intro{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:28px}.intro h1{font:42px/1.15 Georgia,"Microsoft JhengHei",serif;letter-spacing:-.045em;margin:7px 0 10px}.intro p{color:var(--muted);font-size:15px}.date{font-size:13px;color:var(--muted);text-align:right}.date strong{display:block;color:var(--ink);font-weight:500}.today-layout{display:grid;grid-template-columns:minmax(0,1fr) 284px;gap:28px;align-items:start}.hero{display:grid;grid-template-columns:1.13fr 1fr;min-height:365px;overflow:hidden;border:1px solid #d8dfd4;border-radius:var(--radius);background:#edf0e5}.hero-copy{padding:36px 0 36px 36px;position:relative;z-index:1}.tag{font-size:11px;background:rgba(255,255,255,.75);padding:5px 10px;border-radius:6px;color:var(--green);display:inline-block}.hero h2{font:43px/1.12 Georgia,serif;letter-spacing:-.045em;margin:24px 0 14px}.hero p{color:#485d52;font-size:15px}.meta{display:flex;gap:9px;flex-wrap:wrap;font-size:12px;color:var(--muted);align-items:center;margin:18px 0 23px}.dot{width:3px;height:3px;border-radius:100%;background:currentColor}.primary,.secondary,.text-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:12px 17px;border-radius:11px;text-decoration:none;border:1px solid transparent;font-size:14px}.primary{background:var(--green);color:white}.primary:hover{background:#183e34}.secondary{background:#fff;border-color:var(--line)}.secondary:hover{background:#edf1e9}.text-btn{background:none;color:var(--green);padding-inline:7px}.button-row{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.hero-art{display:flex;align-items:center;justify-content:center;overflow:hidden;padding:20px 0}.hero-art svg{width:100%;height:100%;max-height:335px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:30px 0 13px}.section-head h2{font-size:18px;font-weight:600;letter-spacing:-.025em}.section-head span{font-size:12px;color:var(--muted)}.lesson-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.lesson-tile{padding:20px;border:1px solid var(--line);border-radius:17px;background:#fff}.lesson-tile .tile-icon{width:36px;height:36px;border-radius:10px;background:#eaf0e7;display:grid;place-items:center;color:var(--green);margin-bottom:17px}.lesson-tile h3{font:21px/1.25 Georgia,serif;margin-bottom:9px}.lesson-tile p{font-size:13px;color:var(--muted)}.concept-label{margin-top:15px;font-size:11px;color:#687267}.aside-card{padding:24px;border-radius:20px;background:#fff;border:1px solid var(--line)}.aside-card+.aside-card{margin-top:18px}.aside-card h2{font-size:16px;font-weight:600}.aside-card>p{font-size:13px;color:var(--muted);margin-top:6px}.route-list{list-style:none;padding:0;margin:23px 0 0;display:grid;gap:18px}.route-list li{display:flex;align-items:center;gap:12px;font-size:13px}.step-num{font-size:11px;color:var(--green);background:var(--soft);width:28px;height:28px;display:grid;place-items:center;border-radius:50%;flex-shrink:0}.route-list small{display:block;color:var(--muted);font-size:11px}.quote{font:23px/1.4 Georgia,serif;letter-spacing:-.02em;margin:15px 0 10px}.note-label{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}.quiet-box{border-left:2px solid #b2c1ad;padding-left:15px;font-size:13px;color:var(--muted);margin-top:22px}.design-note{margin-top:22px;color:var(--muted);font-size:12px;line-height:1.7}
    .lesson-title{max-width:800px;margin-bottom:26px}.lesson-title h1{font:46px/1.15 Georgia,serif;letter-spacing:-.04em;margin:12px 0}.lesson-title p{color:var(--muted)}.lesson-layout{display:grid;grid-template-columns:minmax(0,800px) 260px;gap:48px;align-items:start}.reader{background:white;border:1px solid var(--line);border-radius:24px;padding:34px 38px}.reader-head{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-bottom:20px}.reader-head h2{font-size:19px;font-weight:600}.reader small{font-size:12px;color:var(--muted)}.sentence{padding:14px 0;border-bottom:1px solid #eff0eb}.sentence:last-child{border-bottom:0}.en{font:21px/1.75 Georgia,serif;letter-spacing:.003em}.zh{font-size:15px;line-height:1.75;color:var(--muted);margin-top:8px}.highlight-word{display:inline;border:0;border-bottom:1px dashed #557b65;border-radius:0;background:#eaf1e6;color:var(--green);padding:0 3px;font:inherit}.reader-section{margin-top:32px}.block-label{display:flex;gap:10px;align-items:center;margin-bottom:17px}.block-label .num{font:italic 17px Georgia,serif;color:#859579}.block-label h2{font-size:20px;letter-spacing:-.02em}.dialogue{background:#edf1e8;padding:22px;border-radius:17px;margin-top:12px;max-width:90%}.dialogue.customer{margin-left:auto;background:#f4f2ed}.speaker{font-size:11px;letter-spacing:.07em;color:var(--green);margin-bottom:6px}.dialogue .en{font-size:19px}.dialogue-tools{display:flex;gap:10px;margin-top:10px}.small-btn{min-height:44px;padding:7px 10px;border:1px solid var(--line);background:rgba(255,255,255,.8);border-radius:8px;font-size:12px}.word-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.word-card{padding:22px;background:white;border:1px solid var(--line);border-radius:16px}.word-card h3{font:26px Georgia,serif;margin-bottom:7px}.word-card .meaning{font-size:14px;color:var(--muted)}.word-card .example{font:17px/1.6 Georgia,serif;margin-top:15px}.word-card .text-btn{font-size:12px;margin-top:10px}.phrase-row{padding:17px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:15px;align-items:center}.phrase-row strong{display:block;font:20px Georgia,serif}.phrase-row span{font-size:13px;color:var(--muted)}.pattern{background:var(--soft);padding:24px;border-radius:17px}.pattern h3{font:24px Georgia,serif;margin:5px 0 13px}.pattern p{font-size:14px;color:var(--muted)}.quiz-box{background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px}.quiz-box h3{font:23px/1.4 Georgia,serif;margin:12px 0 22px}.options{display:grid;gap:10px}.option{display:flex;align-items:center;gap:14px;text-align:left;background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px 15px;min-height:48px;font:17px Georgia,serif}.option .letter{font:11px sans-serif;width:24px;height:24px;border:1px solid var(--line);border-radius:6px;display:grid;place-items:center;flex-shrink:0}.option.correct{background:#e8f0e4;border-color:#73916b}.option.wrong{background:#fcf0e7;border-color:#ad7b5a}.feedback{margin-top:16px;font-size:14px;color:var(--green)}.toc{position:sticky;top:24px}.toc a{display:block;text-decoration:none;color:var(--muted);padding:11px 0;border-bottom:1px solid var(--line);font-size:13px}.toc a:hover{color:var(--green)}.toc .eyebrow{margin-bottom:13px}.sample-note{font-size:12px;color:var(--muted);margin-bottom:20px;padding:12px 16px;background:#ebe9df;border-radius:10px}
    .spec-intro{max-width:720px;margin-bottom:30px}.spec-intro h1{font-size:32px;letter-spacing:-.05em;margin:10px 0 12px}.spec-intro p{color:var(--muted)}.spec-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.spec-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px}.spec-card h2{font-size:19px;margin:7px 0 14px}.spec-card p,.spec-card li{font-size:14px;color:var(--muted)}.spec-card ul{padding-left:20px;margin:0;display:grid;gap:10px}.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:22px 0 32px}.flow-item{padding:20px;background:var(--soft);border-radius:14px}.flow-item strong{display:block;font-size:15px;margin:9px 0 5px}.flow-item small{font-size:12px;color:var(--muted)}.flow-num{font:italic 24px Georgia,serif;color:#70866a}.file-tree{font:13px/1.9 Consolas,monospace;white-space:pre-wrap;margin:0;overflow-wrap:anywhere}.rule-group{background:white;border:1px solid var(--line);border-radius:18px;overflow:hidden}.rule-row{display:grid;grid-template-columns:45px 160px 1fr;gap:20px;padding:23px 26px;border-bottom:1px solid var(--line)}.rule-row:last-child{border:0}.rule-row .rule-id{font:italic 21px Georgia,serif;color:#809175}.rule-row strong{font-size:15px;font-weight:600}.rule-row p{font-size:14px;color:var(--muted)}.doc-links{margin-top:25px;display:flex;gap:12px;flex-wrap:wrap}.mobile-nav{display:none}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#203c33;color:white;padding:12px 20px;border-radius:12px;font-size:13px;z-index:15;box-shadow:0 6px 25px #0002;max-width:calc(100% - 32px)}
    dialog{border:1px solid var(--line);border-radius:22px;padding:0;width:min(620px,calc(100% - 28px));max-height:calc(100dvh - 40px);color:var(--ink);background:white;box-shadow:0 20px 80px #16281b30}dialog::backdrop{background:#192d275f}.dialog-inner{padding:28px}.dialog-top{display:flex;align-items:start;justify-content:space-between;gap:20px}.dialog-top h2{font-size:23px;font-weight:600}.close-btn{border:0;background:var(--paper);border-radius:50%;width:44px;height:44px;flex-shrink:0;font-size:24px}.dialog-caption{font-size:13px;color:var(--muted);margin:12px 0 18px}.prompt-area{width:100%;resize:vertical;min-height:230px;border:1px solid #cbd6c8;border-radius:12px;background:#f8f9f5;color:var(--ink);padding:16px;line-height:1.8;font-size:15px}.dialog-inner .button-row{margin-top:18px}.copy-status{font-size:13px;color:var(--green);min-height:24px;margin-top:12px}.audio-bar{border:1px solid #cdd9cb;border-radius:16px;padding:17px 20px;background:#fff;margin-bottom:24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}.audio-bar .audio-info{flex:1;min-width:130px}.audio-info strong{font-size:14px;display:block}.audio-info span{font-size:12px;color:var(--muted)}.audio-status{font-size:12px;color:var(--muted);width:100%}.speed{border:1px solid var(--line);border-radius:8px;background:var(--paper);padding:7px;min-height:44px}.review-footer{max-width:1200px;margin:0 auto;padding:25px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:15px;color:var(--muted);font-size:12px}
    @media(max-width:1260px){.site-header,main,.review-footer{margin-left:32px;margin-right:32px}.hero h2{font-size:38px}.hero-copy{padding-left:28px}.today-layout{grid-template-columns:minmax(0,1fr) 260px;gap:22px}}
    @media(max-width:980px){.today-layout{grid-template-columns:1fr}.today-aside{display:grid;grid-template-columns:1fr 1fr;gap:20px}.aside-card+.aside-card{margin:0}.hero{min-height:350px}.hero h2{font-size:46px}.lesson-layout{grid-template-columns:1fr}.toc{display:none}.hero-art svg{max-height:310px}.flow{grid-template-columns:1fr 1fr}.nav-btn{padding:10px 12px}}
    @media(max-width:640px){.review-bar{padding:10px 20px;font-size:11px;align-items:start}.review-bar span{display:block}.review-bar a{margin-top:3px}.site-header{padding:20px 0;margin:0 20px}.top-nav{display:none}.brand-title{font-size:21px}.brand-caption{font-size:9px}.brand-mark{width:37px;height:37px}main{padding:27px 0 95px;margin:0 20px}.intro{align-items:start;margin-bottom:23px}.intro h1{font-size:34px}.intro p{font-size:13px}.date{font-size:11px}.eyebrow{font-size:10px}.hero{display:flex;flex-direction:column;min-height:0}.hero-copy{padding:26px 25px 0}.hero h2{font-size:40px;margin-top:19px;max-width:300px}.hero-art{height:195px;padding:0 20px 8px}.hero-art svg{width:100%;max-height:200px}.meta{margin:14px 0 18px}.hero-copy .primary{flex:1}.hero-copy .button-row{gap:5px}.lesson-grid{grid-template-columns:1fr}.lesson-tile{display:grid;grid-template-columns:40px 1fr;column-gap:15px}.lesson-tile .tile-icon{grid-row:1/4;margin:0}.lesson-tile h3{font-size:21px}.lesson-tile .concept-label{grid-column:2}.today-aside{grid-template-columns:1fr}.aside-card{padding:22px}.route-list{grid-template-columns:1fr 1fr;gap:20px 10px}.intro{flex-direction:column;gap:10px}.intro .date{display:flex;gap:8px;text-align:left;padding-top:0;white-space:nowrap}.intro .date strong{display:inline}.lesson-title h1{font-size:36px}.lesson-title p{font-size:14px}.reader{padding:23px 20px}.reader-head{flex-wrap:wrap}.reader-head h2{font-size:17px}.en{font-size:20px}.word-grid{grid-template-columns:1fr}.dialogue{max-width:95%;padding:19px}.dialogue .en{font-size:19px}.dialogue-tools{flex-wrap:wrap}.quiz-box{padding:22px}.spec-grid{grid-template-columns:1fr}.spec-intro h1{font-size:29px}.spec-card{padding:24px}.flow{gap:10px}.flow-item{padding:16px}.rule-row{grid-template-columns:30px 1fr;gap:5px 12px;padding:22px}.rule-row p{grid-column:2}.mobile-nav{position:fixed;bottom:0;left:0;right:0;padding:9px 10px max(9px,env(safe-area-inset-bottom));background:#fdfcf8f5;backdrop-filter:blur(15px);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);z-index:10}.mobile-nav button{border:0;background:none;display:flex;flex-direction:column;align-items:center;gap:4px;font-size:11px;min-height:45px;color:var(--muted);padding:3px}.mobile-nav button[aria-current="page"]{color:var(--green);font-weight:700}.mobile-nav svg{height:19px;width:19px}.review-footer{margin:0 20px;padding:20px 0 98px;font-size:11px;flex-wrap:wrap}.toast{bottom:90px}.dialog-inner{padding:22px}.prompt-area{font-size:16px;min-height:245px}.dialog-inner .button-row>*{flex:1}.audio-bar{padding:15px}.phrase-row{align-items:start}.phrase-row .small-btn{flex-shrink:0}.spec-card li{overflow-wrap:anywhere}}
    @media(prefers-reduced-motion:no-preference){button,a{transition:background .18s,color .18s}.view{animation:appear .18s ease-out}@keyframes appear{from{opacity:.5;transform:translateY(4px)}to{opacity:1;transform:none}}}