:root{color-scheme:light;--bg:#f4f5ef;--panel:#fffef9;--ink:#203c32;--muted:#68796b;--green:#286e53;--soft:#e8efe4;--line:#dce2d5;--gold:#b78a43;--bad:#b83d47;--good:#236f48;--shadow:0 12px 40px #193b2a07}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}body.dark{color-scheme:dark;--bg:#111e19;--panel:#1b2b23;--ink:#edf1e7;--muted:#a8b9aa;--green:#8bd0a4;--soft:#243d2f;--line:#344d3d;--gold:#e1bc7d;--bad:#ffa3a8;--good:#9edab0;--shadow:none}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--gold);outline-offset:4px}.topbar{height:94px;padding:0 4%;display:flex;align-items:center;justify-content:space-between;background:var(--panel);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px;font-weight:700;font-size:22px;letter-spacing:-.6px}.brand small{display:block;font-weight:400;font-size:11px;color:var(--muted);letter-spacing:.6px}.brand-mark{background:#286e53;color:#fff;width:48px;height:48px;border-radius:15px;font-size:34px;text-align:center;line-height:48px}.shell{max-width:1580px;margin:auto;display:grid;grid-template-columns:255px minmax(0,1fr)}aside{padding:30px 24px 30px 28px;border-right:1px solid var(--line)}.eyebrow{font-size:11px;letter-spacing:2px;font-weight:700;color:var(--muted);margin:0 0 17px}nav{display:grid;gap:5px}nav a{display:flex;align-items:center;gap:14px;border-radius:9px;padding:11px 12px;color:var(--muted);font-size:17px}nav a span{font-size:14px;font-weight:550}nav a:hover,nav a.active{background:var(--soft);color:var(--green)}.settings{margin-top:30px;padding-top:23px;border-top:1px solid var(--line);display:grid;gap:8px}.settings label{font-size:12px;font-weight:650;margin-top:9px}.settings small{font-size:11px;color:var(--muted);line-height:1.5}output{float:right;color:var(--green)}input:not([type=range]):not([type=checkbox]),select{width:100%;padding:10px 11px;border-radius:8px;background:var(--panel);color:var(--ink);border:1px solid var(--line);font-size:14px}input[type=range]{width:100%;accent-color:var(--green)}input[type=checkbox]{accent-color:var(--green)}.site-link{display:block;font-size:12px;color:var(--muted);margin-top:26px}main{padding:40px 4%;min-width:0;min-height:calc(100vh - 94px)}h1,h2,h3,p{margin-top:0}h1{font-family:Georgia,"Times New Roman",serif;font-size:clamp(32px,4vw,54px);line-height:1.12;letter-spacing:-1.6px;font-weight:400;margin-bottom:18px}h2{font-size:23px;line-height:1.3;letter-spacing:-.5px}h3{font-size:18px;line-height:1.4;margin-bottom:8px}.muted,.sub{color:var(--muted)}.sub{font-size:15px;max-width:620px}.hero{display:grid;grid-template-columns:1fr 190px;gap:20px;align-items:center;padding:10px 0 25px}.hero h1 em{color:var(--green);font-weight:400}.garden{width:180px;height:180px;border-radius:50%;background:var(--soft);position:relative;display:grid;place-items:center;color:var(--green);font-size:76px;font-family:serif;border:1px solid var(--line)}.garden:after{content:'慢慢来 · KEEP GROWING';position:absolute;bottom:20px;font:9px system-ui;letter-spacing:2px}.garden:before{content:'';position:absolute;inset:12px;border-radius:50%;border:1px dashed var(--green);opacity:.35}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:8px 0 30px}.stat{padding:18px 20px;background:var(--panel);border:1px solid var(--line);border-radius:12px}.stat strong{display:block;font-size:27px;line-height:1.4;font-weight:600}.stat small{font-size:11px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:15px;padding:25px;box-shadow:var(--shadow)}a.card:hover{border-color:var(--green);transform:translateY(-2px);transition:transform .15s}.card .symbol{font-size:30px;color:var(--green);font-family:serif;background:var(--soft);width:54px;height:54px;display:grid;place-items:center;border-radius:14px;margin-bottom:22px}.card p{font-size:14px;color:var(--muted);margin-bottom:12px}.card small{color:var(--green);font-size:12px}.card .arrow{float:right;font-size:22px}.section-title{display:flex;align-items:baseline;justify-content:space-between;margin:28px 0 16px}.section-title h2{margin:0}.section-title small{font-size:12px;color:var(--muted)}.note{font-size:12px;color:var(--muted);margin:24px 0}.primary,.secondary,.quiet{border-radius:9px;padding:11px 18px;font-size:14px;font-weight:600;border:1px solid var(--line);background:var(--panel);color:var(--ink)}.primary{background:var(--green);color:var(--panel);border-color:var(--green)}body.dark .primary{color:#163326}.secondary:hover,.quiet:hover{background:var(--soft)}.quiet{padding:8px 14px;background:transparent}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:22px}.badge{display:inline-block;border:1px solid var(--line);color:var(--green);background:var(--soft);padding:3px 10px;border-radius:30px;font-size:11px;letter-spacing:.3px;margin:0 6px 10px 0}.lesson-card{width:100%;text-align:left;cursor:pointer}.lesson-card:hover{border-color:var(--green)}.lesson-card h3{min-height:50px}.lesson-card .pattern{font-size:14px;color:var(--green);margin-bottom:18px}.rule{border-left:3px solid var(--green);background:var(--soft);padding:20px 22px;border-radius:0 12px 12px 0;margin:20px 0}.rule h2{font-size:25px;color:var(--green);line-height:1.5}.example{padding:22px 0;border-bottom:1px solid var(--line);margin-bottom:20px}.hanzi{font-family:"Noto Sans CJK SC","Microsoft YaHei",sans-serif;font-size:34px;line-height:1.6;word-break:break-word}.pinyin{color:var(--green);font-size:17px}.example p{margin:7px 0}.round-head{display:flex;align-items:center;gap:10px;justify-content:space-between;margin-bottom:15px;flex-wrap:wrap}.round-head strong{color:var(--green)}progress{width:100%;height:6px;border:0;accent-color:var(--green);margin-bottom:26px;border-radius:10px}.question{max-width:860px;margin:auto}.question h2{font-size:24px;line-height:1.5}.tiles{display:flex;flex-wrap:wrap;gap:9px;min-height:100px;padding:15px 0}.answer-zone{background:var(--soft);padding:15px;border-radius:13px;border:1px dashed var(--line);margin:20px 0 5px;min-height:115px}.tile{background:var(--panel);border:1px solid var(--line);border-radius:10px;min-width:80px;padding:10px 15px;display:grid;gap:3px;place-items:center;color:var(--ink);box-shadow:0 3px 0 var(--line)}.tile span{font-size:24px}.tile small{font-size:12px;color:var(--green)}.tile:hover{border-color:var(--green)}.placed .tile{border-color:var(--green)}.empty{font-size:14px;color:var(--muted);align-self:center}.feedback{margin-top:24px;padding:23px;border:1px solid var(--good);border-radius:13px;background:var(--panel)}.feedback.wrong{border-color:var(--bad)}.feedback h3{color:var(--good)}.feedback.wrong h3{color:var(--bad)}.feedback p{margin:8px 0}.options{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:22px 0}.option{padding:18px;text-align:left;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--ink);font-size:17px;line-height:1.6}.option:hover{border-color:var(--green)}.center{text-align:center}.flashcard{min-height:310px;width:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;cursor:pointer;color:var(--ink)}.flashcard .hanzi{font-size:60px}.summary-score{font-size:70px;line-height:1.3;color:var(--green);font-family:Georgia,serif;margin-bottom:8px}.filters{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}.filters>*{flex:1;min-width:130px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}th{font-size:11px;letter-spacing:1px;color:var(--muted);text-transform:uppercase}th,td{padding:16px 12px;border-bottom:1px solid var(--line);white-space:nowrap}td strong{font-size:17px}.word-list{display:grid;gap:12px}.word-item summary{cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:15px}.word-item .hanzi{font-size:25px}.word-item .meaning{font-size:14px;color:var(--muted)}.word-item[open] summary{margin-bottom:15px}.pagination{display:flex;justify-content:space-between;align-items:center;margin-top:20px}.live{color:var(--good);font-size:12px}.storage-note{color:var(--bad);font-size:13px}#toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);max-width:90vw;background:var(--ink);color:var(--panel);padding:12px 22px;border-radius:12px;box-shadow:0 6px 25px #0002;font-size:14px;z-index:10}#toast:empty{display:none}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.spacer{margin-top:25px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(min-width:1350px){main{padding:45px 5%}.grid.home-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:950px){.shell{grid-template-columns:210px minmax(0,1fr)}aside{padding:25px 15px}.hero{grid-template-columns:1fr}.garden{display:none}.stats{grid-template-columns:repeat(2,1fr)}.grid{grid-template-columns:1fr}.options{grid-template-columns:1fr}.lesson-card h3{min-height:0}main{padding:30px 25px}}
@media(max-width:650px){.topbar{height:78px;padding:0 18px}.brand{font-size:18px}.brand-mark{width:39px;height:39px;line-height:39px;font-size:28px}.brand small{font-size:9px}.shell{display:block}aside{padding:15px 18px;border-right:0;border-bottom:1px solid var(--line)}aside>.eyebrow,.site-link{display:none}nav{display:flex;overflow:auto;padding:0 0 7px;gap:5px}nav a{flex-shrink:0;padding:7px 10px;gap:8px}nav a span{font-size:12px}.settings{margin:10px 0 0;padding:10px 0 0;display:grid;grid-template-columns:1fr 1fr;column-gap:15px;row-gap:5px}.settings label{margin:0}.settings label[for=level]{grid-column:1;grid-row:1}.settings #level{grid-column:1;grid-row:2}.settings label[for=difficulty]{grid-column:2;grid-row:1}.settings #difficulty{grid-column:2;grid-row:2}.settings #difficulty-help{grid-column:2;grid-row:3}.settings label[for=player],.settings #player,.settings #player+small{grid-column:1}.settings label[for=player]{grid-row:3}.settings #player{grid-row:4}.settings #player+small{display:none}main{padding:26px 18px}.hero{padding-top:0}.hero h1{font-size:40px}.stat{padding:13px 16px}.stat strong{font-size:24px}.card{padding:22px}.section-title small{display:none}.tile{min-width:65px;padding:9px 11px}.tile span{font-size:22px}.tile small{font-size:11px}.hanzi{font-size:29px}.word-item summary{align-items:flex-start;flex-direction:column;gap:5px}.rule{padding:17px}.rule h2{font-size:21px}.actions>*{flex:1 1 130px;text-align:center}.flashcard .hanzi{font-size:50px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Searchable HSK grammar course. These controls remain usable inside the portfolio. */
.course-levels{display:flex;flex-wrap:wrap;gap:9px;margin:22px 0 18px}
.course-levels button{font-size:12px;padding:9px 12px}
.course-progress{padding:20px 23px;margin:0 0 23px}
.course-progress strong{font-size:23px;font-weight:600;color:var(--green)}
.course-progress span{font-size:13px;color:var(--muted)}
.course-progress progress{display:block;margin:12px 0 10px;height:7px}
.course-progress small{display:block;font-size:11px;color:var(--muted)}
.course-filters{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:12px;align-items:end}
.course-filters>div{min-width:0}
.course-filters label{display:block;font-size:11px;font-weight:650;margin-bottom:7px;color:var(--muted)}
.course-filters select,.course-filters input{min-width:0;max-width:100%}
.lesson-group{margin-bottom:34px}
.lesson-group .section-title{border-top:1px solid var(--line);padding-top:24px}
.lesson-group .section-title h2{font-size:20px}
.lesson-group .lesson-card h3{min-height:0}
.lesson-group .lesson-card .pattern{min-height:38px;font-size:13px}
.course-scope,.mistake-example{padding:18px 0;border-top:1px solid var(--line);font-size:13px;color:var(--muted);line-height:1.8}
.course-scope summary,.mistake-example summary{cursor:pointer;font-weight:600;color:var(--green)}
.course-scope p,.mistake-example p{margin:13px 0}
.course-scope a{text-decoration:underline;text-underline-offset:3px}
@media(max-width:1050px){.course-filters{grid-template-columns:1fr 1fr}.course-filters>div:first-child{grid-column:1/-1}}
@media(max-width:380px){.course-filters{grid-template-columns:1fr}.course-filters>div:first-child{grid-column:auto}.course-levels{gap:6px}.course-levels button{padding:8px 9px;font-size:11px}}