/* 学习工作台布局、导航、目录及响应式基础样式。 */
:root{color-scheme:light;--bg:#fff;--surface:#fff;--text:#202631;--muted:#687181;--line:#e8ebf0;--accent:#2856cc;--accent-soft:#f0f4ff;--on-accent:#fff;--success:#237552;--failure:#b44235;font-family:"Microsoft YaHei UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;line-height:1.6;background:var(--bg);color:var(--text)}
*{box-sizing:border-box}
body{margin:0}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit}
button,a,input{touch-action:manipulation}
button{cursor:pointer;color:inherit}
button:disabled{cursor:default;opacity:.5}
button,a{transition:background .16s,color .16s}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
h1,h2,h3,p{margin:0}
h1,h2,h3{font-weight:500}
h1{font-size:32px;line-height:1.3;letter-spacing:-.6px;overflow-wrap:anywhere}
h2{font-size:18px;line-height:1.5}
h3{font-size:14px}
svg{flex-shrink:0}
.workspace{display:grid;grid-template-columns:186px minmax(0,1fr);min-height:100vh}
.sidebar{background:light-dark(#1c2e49,#111a29);color:light-dark(#f4f7fc,#eaf1ff);padding:32px 19px;display:flex;flex-direction:column;gap:28px;min-height:100vh}
.brand{display:flex;align-items:center;gap:9px;font-weight:500}
.brand-mark{width:30px;height:30px;display:grid;place-items:center;border-radius:8px;background:light-dark(#dae7fb,#c8d9f7);color:light-dark(#1c2e49,#111a29);font-size:15px}
.brand small{display:block;color:light-dark(#a8b7cd,#9dabc2);font-size:11px;font-weight:400;margin-top:1px}
.side-caption{color:light-dark(#a8b7cd,#9dabc2);font-size:11px;letter-spacing:2px;margin:16px 10px -13px}
.sidebar nav{display:grid;gap:8px}
.sidebar nav a{display:flex;align-items:center;gap:10px;color:light-dark(#a8b7cd,#9dabc2);padding:11px 10px;border-radius:7px;font-size:12px}
.sidebar nav a:hover{color:light-dark(#f4f7fc,#eaf1ff)}
.sidebar nav a.active{color:light-dark(#f4f7fc,#eaf1ff);background:light-dark(#2d466b,#2b4265)}
.sidebar nav svg{width:16px;height:16px}
.nav-short{display:none}
.side-bottom{margin-top:auto;border-top:1px solid light-dark(#314663,#2a3b53);padding-top:22px;display:flex;align-items:center;gap:9px;color:light-dark(#a8b7cd,#9dabc2);font-size:11px}
.avatar{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:light-dark(#2d466b,#2b4265);color:light-dark(#f4f7fc,#eaf1ff)}
.workspace-body{min-width:0}
.site-filing{padding:16px 24px;text-align:center;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}
.site-filing a:hover{text-decoration:underline}
.topbar{height:67px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 38px;background:var(--surface);border-bottom:1px solid var(--line);font-size:12px}
.topbar-context{display:flex;gap:12px;color:var(--muted);font-size:11px;white-space:nowrap}
.content{max-width:1280px;margin:auto;padding:38px;min-height:calc(100vh - 67px)}
.page-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:32px}
.eyebrow{display:block;color:var(--muted);font-size:11px;letter-spacing:1px;margin-bottom:9px}
.page-count{font-size:12px;color:var(--muted);white-space:nowrap}
.action,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:18px;min-height:42px;padding:10px 16px;border-radius:7px;white-space:nowrap;font-size:12px}
.action{background:var(--accent);color:var(--on-accent);border:1px solid var(--accent);font-weight:500}
.action:hover{filter:brightness(.95)}
.secondary{background:var(--surface);border:1px solid var(--line)}
.secondary:hover{background:var(--accent-soft)}
.action svg,.secondary svg{width:15px;height:15px}
.subtle-link{font-size:12px;color:var(--accent);display:inline-flex;align-items:center;gap:5px}
.subtle-link:hover{text-decoration:underline}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:18px}
.section-heading span{font-size:11px;color:var(--muted)}
.module-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.module-card{min-width:0;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:end;border:1px solid var(--line);border-radius:16px;padding:20px 18px;background:var(--surface);min-height:126px}
.module-card:hover{background:var(--accent-soft);border-color:var(--accent)}
.module-number{grid-column:1/-1;font-size:11px;color:var(--accent);line-height:1}
.module-card h3{font-size:14px;line-height:1.5}
.module-meta{font-size:11px;color:var(--muted);display:block;margin-top:6px}
.module-card svg,.shenlun-band svg{width:16px;height:16px;color:var(--muted)}
.shenlun-section{margin-top:29px}
.shenlun-band{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:21px 23px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}
.shenlun-band:hover{border-color:var(--accent)}
.orientation-section{margin-top:34px}
.orientation-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:26px}
.orientation-list a{display:flex;align-items:center;gap:13px;padding:13px 0;border-bottom:1px solid var(--line);font-size:12px}
.orientation-list a:hover{color:var(--accent)}
.orientation-list .short-state{margin-left:auto;font-size:11px;color:var(--muted)}
.orientation-list svg{width:14px;height:14px;color:var(--muted)}
.learning-flow{display:flex;align-items:center;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:11px;margin-top:32px}
.learning-flow i{font-style:normal;color:var(--muted);opacity:.6}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:11px;color:var(--muted);margin-bottom:23px}
.breadcrumb a:hover{color:var(--accent)}
.block-picker{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:28px}
.block-picker a{border:1px solid var(--line);background:var(--surface);padding:6px 10px;border-radius:5px;font-size:11px;color:var(--muted)}
.block-picker a.is-active,.block-picker a:hover{background:var(--accent-soft);color:var(--accent);border-color:var(--accent-soft)}
.topics-layout{display:grid;grid-template-columns:minmax(0,1fr) 210px;gap:35px;align-items:start}
.topic-group{margin-bottom:25px}
.topic-group h2{font-size:12px;color:var(--muted);font-weight:400;margin-bottom:7px}
.topic-row{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding:13px 0;font-size:13px}
.topic-row.available{color:var(--accent)}
.topic-row.available:hover{background:var(--accent-soft)}
.topic-state{display:flex;align-items:center;gap:13px;white-space:nowrap;color:var(--muted);font-size:11px}
.topic-state svg{width:14px;height:14px}
.focus-lesson{border:1px solid var(--line);border-radius:16px;padding:23px;background:var(--surface)}
.focus-lesson .eyebrow{color:var(--accent)}
.focus-lesson h2{font-size:22px;line-height:1.5;margin-bottom:20px}
.focus-lesson .action{width:100%;gap:10px}
.mini-bars{height:105px;display:flex;align-items:flex-end;justify-content:center;gap:17px;border-bottom:1px solid var(--line);margin-bottom:24px}
.mini-bars div{width:44px;height:69px;background:var(--accent-soft);border-radius:5px 5px 0 0}
.mini-bars div:last-child{height:83px;background:var(--accent)}
.supplemental{margin-top:25px}
.supplemental h3{font-size:11px;font-weight:400;color:var(--muted);margin-bottom:11px}
.supplemental a{display:flex;align-items:center;justify-content:space-between;padding:10px 0;font-size:12px}
.supplemental svg{width:13px;height:13px;color:var(--muted)}
.review-list{border-top:1px solid var(--line)}
.review-row{display:flex;align-items:center;gap:20px;padding:19px 0;border-bottom:1px solid var(--line)}
.review-row:hover{color:var(--accent)}
.review-row h3{font-size:14px}
.review-row div>span{font-size:11px;color:var(--muted);display:block;margin-top:5px}
.review-due{margin-left:auto;white-space:nowrap;font-size:11px;color:var(--muted)}
.review-due.due{color:var(--accent)}
.review-row svg{width:16px;height:16px;color:var(--muted)}
.empty-state{padding:67px 20px;text-align:center}
.empty-symbol{display:block;color:var(--muted);font-family:Georgia,serif;font-size:37px;margin-bottom:20px}
.empty-state h2{font-size:20px;color:var(--muted);font-weight:400;margin-bottom:26px}
.loading{padding:60px;text-align:center;color:var(--muted)}
.error-state{padding:70px 25px;text-align:center}
.error-state h2{font-size:18px;font-weight:400;margin-bottom:26px}
.error-actions{display:flex;flex-direction:column;align-items:center;gap:16px}
.error-actions .secondary{width:250px;max-width:100%;color:var(--accent)}
.tag{border-radius:5px;padding:4px 9px;font-size:11px;color:var(--accent);background:var(--accent-soft);white-space:nowrap}
.correct{color:var(--success)}
.incorrect{color:var(--failure)}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(min-width:1600px){.workspace{grid-template-columns:220px minmax(0,1fr)}.sidebar{padding:36px 28px}}
@media(max-width:1100px){.content{padding:30px}.topbar{padding:0 30px}.module-card{padding:18px 15px}.topics-layout{grid-template-columns:minmax(0,1fr) 180px;gap:25px}.focus-lesson{padding:19px}}
@media(max-width:820px){.workspace{grid-template-columns:155px minmax(0,1fr)}.sidebar{padding:28px 14px}.content{padding:27px 23px}.topbar{padding:0 23px}.module-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.module-card{min-height:115px}.topics-layout{grid-template-columns:1fr}.topic-aside{display:grid;grid-template-columns:1fr 1fr;gap:22px}.focus-lesson{display:none}.supplemental{margin:0}.orientation-list{grid-template-columns:1fr}.page-heading{gap:18px}h1{font-size:28px}.topbar-context{font-size:11px;gap:7px}}
@media(max-width:560px){.workspace{display:block}.sidebar{min-height:0;padding:19px 20px 13px;gap:20px}.brand{font-size:13px}.brand small{display:inline;margin-left:7px}.side-caption,.side-bottom{display:none}.sidebar nav{display:flex;justify-content:space-between;gap:4px}.sidebar nav a{font-size:11px;gap:6px;padding:9px 6px;min-height:38px}.sidebar nav svg{width:13px;height:13px}.topbar{height:49px;padding:0 20px;font-size:11px}.topbar-context{gap:7px;font-size:11px}.content{padding:26px 20px;min-height:calc(100vh - 163px)}.page-heading{margin-bottom:26px;gap:12px;align-items:flex-start}.page-heading .action{padding:9px 12px;gap:8px;font-size:11px}.eyebrow{font-size:11px;margin-bottom:7px}h1{font-size:27px}h2{font-size:17px}.module-grid{gap:10px}.module-card{padding:17px 12px;min-height:112px;gap:14px}.module-card h3{font-size:12px}.module-meta{font-size:11px}.module-card svg{width:14px;height:14px}.shenlun-band{padding:19px 17px}.orientation-list a{font-size:12px;padding:14px 0}.page-count{font-size:11px}.topic-row{font-size:12px}.breadcrumb{margin-bottom:20px;font-size:11px}.block-picker{gap:6px}.block-picker a{padding:6px 8px;font-size:11px}.learning-flow{gap:7px;font-size:11px}.topic-aside{display:block}.review-row{gap:12px}.review-row h3{font-size:13px}.empty-state{padding:55px 10px}.empty-state h2{font-size:18px}.error-state{padding:50px 10px}.topbar #location{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topbar-context{flex-shrink:0}}
@media(prefers-reduced-motion:reduce){button,a{transition:none}html{scroll-behavior:auto}}
@media(max-width:560px){.nav-long{display:none}.nav-short{display:inline}}