/* 有伴学习空间·小远远版：蓝紫青视觉（融合方向 B） */
:root{
  --bg:#F3F8FF; --bg2:#EAF1FD; --surface:#FFFFFF; --surface-2:#F2F6FF; --ink:#101E47; --ink-2:#4A5680; --ink-3:#7C87AB;
  --line:#DCE5F5; --blue:#3867F6; --blue-ink:#2A52D6; --violet:#8069ED; --cyan:#6BDBE0; --cyan-ink:#0B7F87;
  --ok:#1C8F63; --ok-bg:#E3F5EC; --warn:#A8650B; --warn-bg:#FDF1DD; --bad:#C23A52; --bad-bg:#FCE6EA;
  --grad:linear-gradient(120deg,#3867F6 0%,#8069ED 58%,#6BDBE0 120%);
  --grad-soft:linear-gradient(135deg,#EEF3FF 0%,#F3EEFF 55%,#E9FBFC 100%);
  --shadow:0 1px 2px rgba(16,30,71,.05),0 10px 28px rgba(16,30,71,.07);
  --shadow-lg:0 18px 50px rgba(40,60,160,.18);
  --r:18px; --r-s:12px;
  --f:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --fd:"Manrope","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --fm:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0A1130; --bg2:#0F1840; --surface:#131C44; --surface-2:#18234F; --ink:#E9EEFF; --ink-2:#AEB8DC; --ink-3:#7A86AF;
  --line:#27336A; --blue:#7C9BFF; --blue-ink:#A3B7FF; --violet:#A895FF; --cyan-ink:#7FE3E8;
  --ok:#5BD3A0; --ok-bg:#12352A; --warn:#F2B75E; --warn-bg:#3A2A10; --bad:#FF8DA0; --bad-bg:#3D1822;
  --grad-soft:linear-gradient(135deg,#17224F 0%,#1F1C4F 55%,#123341 100%);
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 28px rgba(0,0,0,.28); color-scheme:dark;}}
:root[data-theme="dark"]{--bg:#0A1130;--bg2:#0F1840;--surface:#131C44;--surface-2:#18234F;--ink:#E9EEFF;--ink-2:#AEB8DC;--ink-3:#7A86AF;--line:#27336A;--blue:#7C9BFF;--blue-ink:#A3B7FF;--violet:#A895FF;--cyan-ink:#7FE3E8;--ok:#5BD3A0;--ok-bg:#12352A;--warn:#F2B75E;--warn-bg:#3A2A10;--bad:#FF8DA0;--bad-bg:#3D1822;--grad-soft:linear-gradient(135deg,#17224F 0%,#1F1C4F 55%,#123341 100%);--shadow:0 1px 2px rgba(0,0,0,.3),0 10px 28px rgba(0,0,0,.28);color-scheme:dark}

*{box-sizing:border-box} html,body{margin:0;min-height:100%}
body{background:var(--bg);color:var(--ink);font:15px/1.7 var(--f);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:-20% -10% auto auto;width:60vw;height:60vw;background:radial-gradient(closest-side,rgba(128,105,237,.12),transparent);pointer-events:none;z-index:0}
h1,h2,h3,h4{font-family:var(--fd);line-height:1.3;margin:0;text-wrap:balance} h1{font-size:28px;font-weight:800;letter-spacing:-.01em} h2{font-size:20px;font-weight:800} h3{font-size:16px;font-weight:700}
p{margin:0} a{color:var(--blue-ink)} button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:8px}
.muted{color:var(--ink-2)} .faint{color:var(--ink-3);font-size:13px} .mono{font-family:var(--fm);font-variant-numeric:tabular-nums}
.label{font-size:12px;font-weight:700;letter-spacing:.08em;color:var(--ink-3)}
[hidden]{display:none!important}

/* 布局 */
.app{position:relative;z-index:1;display:grid;grid-template-columns:auto minmax(0,1fr);min-height:100vh}
.side{position:sticky;top:0;height:100vh;width:248px;display:flex;flex-direction:column;gap:20px;padding:22px 14px 16px;border-right:1px solid var(--line);background:linear-gradient(180deg,color-mix(in srgb,var(--blue) 6%,var(--surface)) 0%,color-mix(in srgb,var(--cyan) 5%,var(--surface)) 100%);transition:width .2s}
.side.mini{width:78px}
.side.mini .brand-text,.side.mini .nav span,.side.mini .side-card,.side.mini .nav .n,.side.mini .nav-sec{display:none}
.brand{display:flex;align-items:center;gap:11px;padding:0 6px;text-decoration:none;color:inherit}
.brand img{width:40px;height:40px}
.brand-text b{display:block;font-family:var(--fd);font-weight:800;font-size:17px;line-height:1.2}
.brand-text small{color:var(--ink-3);font-size:12px}
.collapse{margin-left:auto;border:none;background:none;color:var(--ink-3);cursor:pointer;padding:6px;border-radius:8px;display:grid}
.collapse:hover{background:var(--surface-2);color:var(--ink)}
.side.mini .collapse{margin:0 auto}
.nav{display:flex;flex-direction:column;gap:3px}
.nav-sec{font-size:11px;font-weight:700;letter-spacing:.1em;color:var(--ink-3);padding:12px 12px 4px}
.nav a{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:13px;color:var(--ink-2);text-decoration:none;font-weight:600;position:relative}
.nav a svg{width:20px;height:20px;flex:none}
.nav a:hover{background:color-mix(in srgb,var(--blue) 8%,transparent);color:var(--ink)}
.nav a[aria-current="page"]{background:var(--grad);color:#fff;box-shadow:0 8px 20px color-mix(in srgb,var(--blue) 30%,transparent)}
.nav .n{margin-left:auto;font-family:var(--fm);font-size:11px;line-height:18px;min-width:20px;text-align:center;border-radius:99px;background:var(--bad-bg);color:var(--bad);padding:0 6px}
.nav a[aria-current="page"] .n{background:rgba(255,255,255,.25);color:#fff}
.side-card{margin-top:auto;display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:16px;background:var(--surface);border:1px solid var(--line);text-decoration:none;color:inherit}
.avatar{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;background:var(--grad);color:#fff;font-weight:800;font-family:var(--fd);flex:none}
.main{min-width:0;padding:26px clamp(16px,3.6vw,44px) 70px;max-width:1240px;width:100%}
.topline{display:flex;align-items:center;gap:12px;justify-content:space-between;margin-bottom:22px;flex-wrap:wrap}
.crumbs{display:flex;gap:6px;align-items:center;font-size:13px;color:var(--ink-3);flex-wrap:wrap}
.crumbs a{color:var(--ink-2);text-decoration:none} .crumbs a:hover{color:var(--blue-ink)}
.pill{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border-radius:99px;background:var(--surface);border:1px solid var(--line);font-size:13px;color:var(--ink-2);font-weight:600}
.pill i{width:8px;height:8px;border-radius:50%;background:var(--ok)} .pill.off i{background:var(--warn)}
.mobilebar,.bottomnav{display:none}

/* 组件 */
.card h3 > svg,.card h2 > svg{color:var(--blue)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--shadow)}
.stack{display:flex;flex-direction:column;gap:12px} .row{display:flex;gap:10px;align-items:center;flex-wrap:wrap} .between{justify-content:space-between}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:10px 18px;border-radius:12px;font-weight:700;cursor:pointer;text-decoration:none;white-space:nowrap;transition:transform .08s,box-shadow .15s}
.btn:hover{border-color:var(--blue);color:var(--blue-ink)} .btn:active{transform:translateY(1px)}
.btn svg{width:18px;height:18px}
.btn.primary{background:var(--grad);border-color:transparent;color:#fff;box-shadow:0 8px 20px color-mix(in srgb,var(--blue) 28%,transparent)}
.btn.primary:hover{color:#fff;box-shadow:0 10px 26px color-mix(in srgb,var(--blue) 38%,transparent)}
.btn.ghost{border-color:transparent;background:transparent;color:var(--ink-2)} .btn.ghost:hover{background:var(--surface-2);color:var(--ink)}
.btn.small{padding:6px 12px;font-size:13px;border-radius:10px} .btn.block{width:100%}
.btn.danger{color:var(--bad)} .btn[disabled]{opacity:.5;pointer-events:none}
.chip{display:inline-flex;align-items:center;gap:5px;padding:2px 10px;border-radius:99px;font-size:12px;font-weight:700;background:var(--surface-2);color:var(--ink-2);white-space:nowrap}
.chip.ok{background:var(--ok-bg);color:var(--ok)} .chip.warn{background:var(--warn-bg);color:var(--warn)} .chip.bad{background:var(--bad-bg);color:var(--bad)} .chip.info{background:color-mix(in srgb,var(--blue) 12%,var(--surface));color:var(--blue-ink)} .chip.vi{background:color-mix(in srgb,var(--violet) 14%,var(--surface));color:var(--violet)}
.input,select.input,textarea.input{width:100%;border:1.5px solid var(--line);background:var(--surface);border-radius:12px;padding:10px 13px}
textarea.input{min-height:96px;resize:vertical;line-height:1.65}
.input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px color-mix(in srgb,var(--blue) 15%,transparent)}
.field{display:flex;flex-direction:column;gap:6px} .field>span{font-size:13px;font-weight:700;color:var(--ink-2)}
.notice{padding:11px 15px;border-radius:12px;background:var(--surface-2);color:var(--ink-2);font-size:14px}
.notice.warn{background:var(--warn-bg);color:var(--warn)} .notice.bad{background:var(--bad-bg);color:var(--bad)} .notice.ok{background:var(--ok-bg);color:var(--ok)}
.empty{display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px;padding:34px 20px;border:1.5px dashed var(--line);border-radius:var(--r)}
.empty img{width:96px;opacity:.95}
.toast{position:fixed;left:50%;bottom:calc(26px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:11px 20px;border-radius:14px;font-size:14px;z-index:90;box-shadow:var(--shadow-lg);max-width:calc(100% - 32px)}
.spinner{width:18px;height:18px;border-radius:50%;border:2.5px solid color-mix(in srgb,var(--blue) 25%,transparent);border-top-color:var(--blue);animation:spin .8s linear infinite;flex:none}
@keyframes spin{to{transform:rotate(360deg)}}
.dots{display:inline-flex;gap:4px} .dots i{width:6px;height:6px;border-radius:50%;background:var(--violet);animation:blink 1.2s infinite} .dots i:nth-child(2){animation-delay:.2s} .dots i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}
.tabs{display:flex;gap:4px;padding:5px;border-radius:15px;background:var(--surface-2);overflow-x:auto;max-width:100%;align-self:flex-start;position:sticky;top:10px;z-index:5;box-shadow:var(--shadow)}
.tabs a{padding:9px 18px;border-radius:11px;color:var(--ink-2);font-weight:700;text-decoration:none;white-space:nowrap;display:inline-flex;gap:6px;align-items:center}
.tabs a[aria-current="page"]{background:var(--surface);color:var(--blue-ink);box-shadow:0 2px 8px rgba(16,30,71,.08)}
.tabs a .n{font-family:var(--fm);font-size:11px;color:var(--ink-3)}
table.t{width:100%;border-collapse:collapse;font-size:14px}
table.t th{text-align:left;font-size:12px;letter-spacing:.06em;color:var(--ink-3);padding:8px 10px;border-bottom:1px solid var(--line);white-space:nowrap}
table.t td{padding:11px 10px;border-bottom:1px solid var(--line);vertical-align:top}
table.t tr:hover td{background:color-mix(in srgb,var(--blue) 3%,transparent)}
.tablewrap{overflow-x:auto}

/* 首页（教练式） */
.home{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:22px;align-items:start}
.hero{position:relative;overflow:hidden;border-radius:26px;padding:28px 30px;color:#fff;background:var(--grad);box-shadow:var(--shadow-lg);display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:10px;align-items:center;min-height:250px}
.hero::after{content:"";position:absolute;inset:auto -80px -120px auto;width:340px;height:340px;border-radius:50%;background:radial-gradient(closest-side,rgba(255,255,255,.22),transparent)}
.hero .tag{display:inline-flex;align-self:flex-start;padding:5px 14px;border-radius:99px;background:rgba(255,255,255,.2);font-size:13px;font-weight:700;backdrop-filter:blur(6px)}
.hero h2{font-size:clamp(22px,3vw,32px);color:#fff;margin:12px 0 8px}
.hero p{color:rgba(255,255,255,.92);max-width:52ch}
.hero .row{margin-top:18px}
.hero .btn.primary{background:#fff;color:#2A3FB0;box-shadow:0 10px 24px rgba(10,20,80,.25)} .hero .btn.primary:hover{color:#1E2F90}
.hero .btn.ghostw{background:rgba(255,255,255,.12);border:1.5px solid rgba(255,255,255,.55);color:#fff}
.hero img{width:100%;max-width:300px;justify-self:end;position:relative;z-index:1;animation:float 6s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-8px)}}
.steps4{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:14px;margin-top:18px}
.step{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border-radius:14px;position:relative}
.step .no{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:13px;background:var(--surface-2);color:var(--ink-3);flex:none}
.step b{display:block;font-size:14px} .step span{font-size:12px;color:var(--ink-3)}
.step.done .no{background:var(--ok-bg);color:var(--ok)}
.step.now{background:color-mix(in srgb,var(--blue) 7%,var(--surface));outline:1.5px solid color-mix(in srgb,var(--blue) 35%,transparent)}
.step.now .no{background:var(--grad);color:#fff} .step.now b{color:var(--blue-ink)}
.coursecard{display:flex;gap:14px;align-items:center;padding:12px;border-radius:16px;border:1px solid var(--line);text-decoration:none;color:inherit;background:var(--surface)}
.coursecard:hover{border-color:var(--blue);box-shadow:var(--shadow)}
.cbadge{width:62px;height:62px;border-radius:16px;display:grid;place-items:center;text-align:center;color:#fff;font-family:var(--fd);font-weight:800;font-size:13px;line-height:1.15;flex:none;background:var(--grad);padding:4px;overflow:hidden;word-break:break-all}
.cbadge.c1{background:linear-gradient(135deg,#8069ED,#B07CF2)} .cbadge.c2{background:linear-gradient(135deg,#3867F6,#5BA8F7)} .cbadge.c3{background:linear-gradient(135deg,#0FA3B1,#6BDBE0)} .cbadge.c4{background:linear-gradient(135deg,#E8618C,#F2A3B6)}
.sugg{display:flex;gap:12px;align-items:center;padding:12px;border-radius:14px;text-decoration:none;color:inherit;border:1px solid transparent;cursor:pointer;background:none;text-align:left;width:100%}
.sugg:hover{background:var(--surface-2);border-color:var(--line)}
.sugg .ic{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;flex:none;color:#fff}
.sugg .ic svg{width:20px;height:20px}
.sugg b{display:block;font-size:14px} .sugg span{font-size:12.5px;color:var(--ink-3)}
.butler{position:sticky;top:20px;border-radius:24px;overflow:hidden;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow)}
.butler-top{background:var(--grad-soft);padding:18px 18px 0;display:flex;flex-direction:column;align-items:center;text-align:center}
.butler-top img{width:150px;margin-bottom:-6px;animation:float 5s ease-in-out infinite}
.butler-body{padding:18px;display:flex;flex-direction:column;gap:12px}
.stat3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.stat{border:1px solid var(--line);border-radius:14px;padding:10px 12px;min-width:0}
.stat span{display:block;font-size:12px;color:var(--ink-3)} .stat b{font-family:var(--fd);font-size:24px;font-variant-numeric:tabular-nums;line-height:1.2}
.stat b small{font-size:12px;color:var(--ink-3);margin-left:2px;font-weight:600}
.stat.hot{background:var(--grad);border-color:transparent;color:#fff} .stat.hot span,.stat.hot b small{color:rgba(255,255,255,.85)}
.revlist a{display:flex;align-items:center;gap:10px;padding:10px 0 10px 12px;border-bottom:1px solid var(--line);text-decoration:none;color:inherit;position:relative}
.revlist a::before{content:"";position:absolute;left:0;top:12px;bottom:12px;width:3px;border-radius:3px;background:var(--grad)}
.revlist a:last-child{border-bottom:none} .revlist .m{flex:1;min-width:0} .revlist b{display:block;font-size:14px;overflow-wrap:anywhere} .revlist span{font-size:12px;color:var(--ink-3)}

/* 欢迎页与引导 */
.welcome{min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr;position:relative;z-index:1}
.wl{padding:48px clamp(20px,6vw,80px);display:flex;flex-direction:column;justify-content:center;gap:22px}
.wr{background:var(--grad);position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;padding:40px}
.wr::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 20%,rgba(255,255,255,.25),transparent 40%),radial-gradient(circle at 80% 90%,rgba(107,219,224,.5),transparent 45%)}
.wr .scene{position:relative;display:flex;flex-direction:column;align-items:center;gap:16px;color:#fff;text-align:center;max-width:420px}
.wr .scene img.m{width:220px;animation:float 5s ease-in-out infinite}
.bubble-w{background:rgba(255,255,255,.18);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.35);border-radius:18px;padding:14px 18px;font-size:15px;text-align:left}
.wl h1{font-size:clamp(30px,4.4vw,46px);line-height:1.2}
.wl h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.flow3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.flow3 div{padding:14px;border-radius:16px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow)}
.flow3 b{display:block;font-family:var(--fd)} .flow3 span{font-size:13px;color:var(--ink-3)}
.flow3 i{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:9px;background:var(--grad);color:#fff;font-style:normal;font-weight:800;font-size:13px;margin-bottom:6px}
.auth{max-width:440px;width:100%}
.opts{display:flex;gap:8px;flex-wrap:wrap}
.opt{border:1.5px solid var(--line);background:var(--surface);border-radius:12px;padding:9px 15px;cursor:pointer;font-weight:600}
.opt[aria-pressed="true"]{border-color:var(--blue);background:color-mix(in srgb,var(--blue) 9%,var(--surface));color:var(--blue-ink)}
.stepper{display:flex;gap:6px} .stepper i{height:6px;flex:1;border-radius:99px;background:var(--line)} .stepper i.on{background:var(--grad)}
.seg{display:flex;padding:4px;border-radius:12px;background:var(--surface-2)} .seg button{flex:1;border:none;background:none;padding:8px;border-radius:9px;font-weight:700;color:var(--ink-2);cursor:pointer} .seg button[aria-pressed="true"]{background:var(--surface);color:var(--blue-ink);box-shadow:0 2px 6px rgba(0,0,0,.06)}

/* 资料 */
.drop{border:2px dashed color-mix(in srgb,var(--blue) 40%,var(--line));border-radius:var(--r);padding:22px;display:flex;gap:16px;align-items:center;flex-wrap:wrap;background:color-mix(in srgb,var(--blue) 4%,var(--surface))}
.drop.over{background:color-mix(in srgb,var(--blue) 12%,var(--surface))}
.drop .ic{width:52px;height:52px;border-radius:16px;background:var(--grad);display:grid;place-items:center;color:#fff;flex:none} .drop .ic svg{width:26px;height:26px}
.mat{display:flex;flex-direction:column;gap:12px}
.mat-head{display:flex;gap:12px;align-items:flex-start;flex-wrap:wrap}
.ficon{width:42px;height:50px;border-radius:9px;flex:none;display:grid;place-items:end center;padding-bottom:6px;font-family:var(--fm);font-size:10px;font-weight:800;color:var(--blue-ink);background:var(--surface-2);border:1px solid var(--line);position:relative}
.ficon::before{content:"";position:absolute;right:-1px;top:-1px;width:12px;height:12px;background:var(--bg);border-left:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:0 9px 0 6px}
.pages{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}
.page{border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:var(--surface);cursor:pointer;text-align:left;display:flex;flex-direction:column;gap:5px}
.page:hover{border-color:var(--blue)} .page.off{opacity:.45}
.page .pv{font-size:12.5px;color:var(--ink-2);display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere;line-height:1.5}

/* 精讲 */
.lec-hero{background:var(--grad-soft);border:1px solid var(--line);border-radius:22px;padding:22px;display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap}
.lec-hero .overview{font-size:16px;line-height:1.85;max-width:72ch}
.point{display:flex;flex-direction:column;gap:12px}
.point-top{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.point .num{font-family:var(--fm);font-size:12px;color:var(--ink-3)}
.body{white-space:pre-wrap;overflow-wrap:anywhere;max-width:74ch;line-height:1.85}
.box{border-radius:12px;padding:11px 15px;font-size:14.5px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.75}
.box b{display:block;font-size:12px;letter-spacing:.06em;color:var(--ink-3);margin-bottom:2px}
.box.why{background:var(--surface-2)} .box.ex{background:color-mix(in srgb,var(--cyan) 13%,var(--surface))} .box.pit{background:var(--warn-bg)} .box.pit b{color:var(--warn)}
.refs{display:flex;gap:6px;flex-wrap:wrap}
.ref{display:inline-flex;align-items:center;gap:6px;font-family:var(--fm);font-size:11.5px;padding:3px 10px;border-radius:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);cursor:pointer}
.ref:hover{border-color:var(--blue);color:var(--blue-ink)}
.ref::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--warn)} .ref.ok::before{background:var(--ok)}
.meter{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.bar{height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden;flex:1;min-width:120px} .bar i{display:block;height:100%;background:var(--grad);border-radius:99px}
details.sc{border:1px solid var(--line);border-radius:12px;padding:10px 14px;background:var(--surface)} details.sc summary{cursor:pointer;font-weight:700}

/* 问小伴 */
.chat{display:flex;flex-direction:column;gap:16px}
.msg{display:grid;grid-template-columns:38px minmax(0,1fr);gap:10px;max-width:820px}
.msg img{width:38px;height:38px}
.msg .bub{background:var(--surface);border:1px solid var(--line);border-radius:4px 16px 16px 16px;padding:12px 16px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.8;box-shadow:var(--shadow)}
.msg.me{grid-template-columns:minmax(0,1fr);justify-self:end} .msg.me .bub{background:var(--grad);color:#fff;border:none;border-radius:16px 4px 16px 16px}
.cite{display:inline-flex;font-family:var(--fm);font-size:11px;padding:0 7px;margin:0 2px;border-radius:6px;background:var(--surface-2);color:var(--blue-ink);cursor:pointer;border:none;vertical-align:1px}
.composer{position:sticky;bottom:12px;display:flex;flex-direction:column;gap:10px;padding:14px;background:var(--surface);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow-lg)}
.composer textarea{flex:1;min-width:0;width:100%;border:none;min-height:46px;max-height:200px;resize:none;background:transparent;padding:4px;outline:none}
.qchips{display:flex;gap:8px;flex-wrap:wrap} .qchips button{border:1px solid color-mix(in srgb,var(--blue) 25%,var(--line));background:color-mix(in srgb,var(--blue) 5%,var(--surface));border-radius:99px;padding:6px 13px;font-size:13px;cursor:pointer;color:var(--ink-2)}
.qchips button:hover{border-color:var(--blue);color:var(--blue-ink)}

/* 试卷 */
.sheet{background:var(--surface);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);overflow:hidden}
.sheet-head{padding:24px 28px;border-bottom:2px solid var(--ink);display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:end;background:repeating-linear-gradient(0deg,transparent 0 31px,color-mix(in srgb,var(--blue) 5%,transparent) 31px 32px)}
.sheet-head h1{font-size:24px}
.sheet-meta{display:flex;gap:18px;flex-wrap:wrap;font-size:13px;color:var(--ink-2)} .sheet-meta b{color:var(--ink);font-family:var(--fd)}
.scorebox{border:2px solid var(--ink);border-radius:12px;padding:8px 16px;text-align:center;min-width:110px}
.scorebox b{display:block;font-family:var(--fd);font-size:28px;line-height:1.1} .scorebox span{font-size:12px;color:var(--ink-3)}
.instr{padding:14px 28px;background:var(--surface-2);font-size:14px;color:var(--ink-2)}
.section{padding:22px 28px;border-top:1px solid var(--line)}
.section > h3{display:flex;gap:10px;align-items:baseline;margin-bottom:4px} .section > h3 small{font-weight:600;color:var(--ink-3);font-size:13px}
.q{padding:16px 0;border-bottom:1px dashed var(--line);display:flex;flex-direction:column;gap:10px}
.q:last-child{border-bottom:none}
.qh{display:flex;gap:10px;align-items:baseline}
.qno{font-family:var(--fd);font-weight:800;min-width:34px} .qmarks{margin-left:auto;font-size:12px;color:var(--ink-3);white-space:nowrap;font-family:var(--fm)}
.stem{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.8;flex:1}
.material{background:var(--surface-2);border-left:4px solid var(--violet);border-radius:0 12px 12px 0;padding:12px 16px;white-space:pre-wrap;font-size:15px;overflow-x:auto;line-height:1.8}
.material.code{font-family:var(--fm);font-size:14px;line-height:1.6}
.choices{display:flex;flex-direction:column;gap:8px;padding-left:44px}
.choice{display:flex;gap:10px;align-items:flex-start;text-align:left;border:1.5px solid var(--line);background:var(--surface);border-radius:12px;padding:9px 14px;cursor:pointer;overflow-wrap:anywhere;line-height:1.6}
.choice:hover:not([disabled]){border-color:var(--blue)}
.choice[aria-checked="true"]{border-color:var(--blue);background:color-mix(in srgb,var(--blue) 8%,var(--surface))}
.choice .k{font-family:var(--fm);font-weight:800;color:var(--ink-3);width:18px;flex:none}
.choice.right{border-color:var(--ok);background:var(--ok-bg)} .choice.wrong{border-color:var(--bad);background:var(--bad-bg)} .choice[disabled]{cursor:default}
.ans{padding-left:44px} .ans .input{font-family:var(--f)}
.blank{display:inline-block;width:160px;margin:2px 4px}
.verdict{border-radius:12px;padding:10px 14px;font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7;margin-left:44px}
.verdict b{display:block;font-size:12px;letter-spacing:.06em;color:var(--ink-3);margin-bottom:2px}
.verdict.ok{background:var(--ok-bg)} .verdict.bad{background:var(--bad-bg)} .verdict.part{background:var(--warn-bg)} .verdict.n{background:var(--surface-2)}
.submitbar{position:sticky;bottom:12px;z-index:6;display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:12px 16px;border-radius:18px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-lg)}
.ring{--p:0;width:120px;height:120px;border-radius:50%;flex:none;display:grid;place-items:center;background:conic-gradient(from -90deg,#3867F6 0,#8069ED calc(var(--p)*.6%),#6BDBE0 calc(var(--p)*1%),var(--surface-2) 0)}
.ring>div{width:94px;height:94px;border-radius:50%;background:var(--surface);display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.1}
.ring b{font-family:var(--fd);font-size:30px} .ring span{font-size:12px;color:var(--ink-3)}
.kpbar{display:flex;height:14px;border-radius:99px;overflow:hidden;background:var(--surface-2)}
.photos{display:flex;gap:8px;flex-wrap:wrap}

/* 抽屉 */
.scrim{position:fixed;inset:0;background:rgba(10,17,48,.38);z-index:40}
.drawer{position:fixed;top:0;right:0;bottom:0;width:min(600px,100%);background:var(--surface);z-index:41;display:flex;flex-direction:column;box-shadow:-12px 0 40px rgba(10,17,48,.2)}
.drawer-h{display:flex;gap:10px;align-items:center;justify-content:space-between;padding:calc(14px + env(safe-area-inset-top)) 18px 14px;border-bottom:1px solid var(--line)}
.drawer-b{flex:1;overflow:auto;padding:18px} .drawer-f{display:flex;gap:8px;justify-content:space-between;padding:12px 18px calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--line)}
.pagetext{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14.5px;line-height:1.8} .pagetext mark{background:#FFE9A8;color:#101E47;border-radius:3px;padding:0 2px}

/* 老师端 */
.flags{display:flex;gap:5px;flex-wrap:wrap}
.codebox{font-family:var(--fm);font-size:22px;font-weight:800;letter-spacing:.12em;padding:8px 14px;border-radius:12px;background:var(--surface-2);border:1.5px dashed var(--blue)}

/* 打印：只打印卷面 */
@media print{
  body{background:#fff} body::before{display:none} .side,.mobilebar,.bottomnav,.topline,.submitbar,.noprint,.tabs{display:none!important}
  .app{display:block} .main{padding:0;max-width:none} .sheet{border:none;box-shadow:none}
  .ans .input{border:none;border-bottom:1px solid #999;border-radius:0;min-height:120px} .choice{border:none;padding:2px 0}
}

/* 手机 */
@media (max-width:1100px){.home{grid-template-columns:1fr}.butler{position:static}}
@media (max-width:900px){
  .app{grid-template-columns:minmax(0,1fr)} .side{display:none}
  .mobilebar{display:flex;position:sticky;top:0;z-index:20;align-items:center;justify-content:space-between;gap:10px;padding:calc(10px + env(safe-area-inset-top)) 16px 10px;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
  .mobilebar .brand img{width:32px;height:32px}
  .bottomnav{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:20;background:var(--surface);border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
  .bottomnav a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;font-size:11px;color:var(--ink-3);text-decoration:none;padding:4px 0;position:relative}
  .bottomnav a svg{width:22px;height:22px} .bottomnav a[aria-current="page"]{color:var(--blue-ink);font-weight:700}
  .bottomnav .n{position:absolute;top:0;left:calc(50% + 6px);font-size:10px;line-height:15px;min-width:15px;padding:0 4px;border-radius:99px;background:var(--bad);color:#fff;text-align:center}
  .main{padding:16px 16px 100px}
  .hero{grid-template-columns:1fr;padding:22px;min-height:0} .hero img{max-width:180px;justify-self:center;order:-1;margin-bottom:-6px}
  .steps4{grid-template-columns:1fr 1fr}
  .welcome{grid-template-columns:1fr} .wr{min-height:0;order:-1;padding:18px 16px} .wr .scene{flex-direction:row;gap:12px;text-align:left} .wr .scene img.m{width:84px} .wr .scene img:not(.m){display:none} .wr .bubble-w{font-size:13px;padding:10px 12px} .wl{padding:22px 16px 40px;gap:16px} .wl h1{font-size:28px}
  .flow3{grid-template-columns:1fr}
  .sheet-head{grid-template-columns:1fr;padding:18px} .section,.instr{padding-left:16px;padding-right:16px}
  .choices,.ans{padding-left:0} .verdict{margin-left:0}
  .composer{bottom:76px} .submitbar{bottom:72px}
  h1{font-size:24px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}