/* ============================================================
 * 九章智伴 · 样式表（浅色学术风 · v2）
 * 设计目标：信息密度可控、层级清晰、键盘可用、移动端可用
 * ============================================================ */
:root{
  --bg:#f2f6fd;
  --surface:#ffffff;
  --surface-2:#f7faff;
  --surface-3:#eef4fd;
  --border:#dfe7f3;
  --border-2:#edf2fa;
  --text:#0b1b33;
  --text-2:#41536d;
  --muted:#64748b;
  --primary:#2563eb;
  --primary-2:#3b82f6;
  --primary-dark:#1d4ed8;
  --primary-soft:#e8f0ff;
  --violet:#6d28d9;
  --violet-soft:#f2ecff;
  --green:#15803d;
  --green-soft:#e8f7ee;
  --orange:#d97706;
  --orange-soft:#fff4e5;
  --red:#dc2626;
  --red-soft:#fdeced;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(30,64,175,.06);
  --shadow-lg:0 24px 60px rgba(15,23,42,.16);
  --sidebar:252px;
  --sidebar-bg:linear-gradient(180deg,#07182f 0%,#0b2547 52%,#0e2d57 100%);
}
*{box-sizing:border-box;margin:0;padding:0}
[hidden]{display:none!important}
html,body{height:100%}
body{
  background:
    radial-gradient(1100px 560px at 100% -12%, rgba(79,70,229,.08), transparent 62%),
    radial-gradient(900px 520px at -8% 18%, rgba(6,182,212,.06), transparent 58%),
    var(--bg);
  color:var(--text);
  font:14px/1.65 system-ui,-apple-system,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;left:12px;top:-60px;z-index:300;background:var(--text);color:#fff;padding:8px 14px;border-radius:8px;transition:top .15s}
.skip-link:focus{top:12px}
.noscript{position:fixed;inset:0;display:grid;place-items:center;background:#fff;z-index:400;font-size:16px}

/* ---------- 布局 ---------- */
.app{display:flex;height:100vh;height:100dvh;overflow:hidden}
.sidebar{
  width:var(--sidebar);flex:none;background:var(--sidebar-bg);
  border-right:0;display:flex;flex-direction:column;z-index:60;
  box-shadow:8px 0 30px rgba(7,24,47,.12);
}
.main{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}
.content{flex:1;overflow-y:auto;padding:20px 28px 48px;scroll-behavior:smooth}
.content::-webkit-scrollbar{width:10px}

/* ---------- 品牌区 ---------- */
.brand{display:flex;gap:11px;align-items:center;padding:22px 18px 18px;border-bottom:1px solid rgba(255,255,255,.08)}
.brand-mark{
  width:40px;height:40px;flex:none;border-radius:12px;
  background:linear-gradient(140deg,#38bdf8 0%,#6366f1 55%,#a855f7 100%);
  color:#fff;font-weight:700;display:grid;place-items:center;font-size:19px;
  box-shadow:0 8px 22px rgba(56,189,248,.28);font-family:"Songti SC","SimSun",serif;
}
.brand-text{min-width:0}
.brand-title{font-weight:700;font-size:15px;letter-spacing:.6px;color:#fff}
.brand-sub{font-size:11.5px;color:#93b4d8;margin-top:1px;white-space:nowrap}
.drawer-close{display:none;margin-left:auto;border:0;background:transparent;font-size:22px;line-height:1;color:#dbeafe}

/* ---------- 导航 ---------- */
.nav{padding:14px 12px;flex:1;display:flex;flex-direction:column;gap:4px;overflow-y:auto}
.nav-item{
  display:flex;align-items:center;gap:11px;
  padding:9px 12px;border:1px solid transparent;background:transparent;border-radius:10px;
  cursor:pointer;color:#a9c2de;text-align:left;width:100%;
  transition:background .18s,color .18s,border-color .18s;font-size:13.5px;
}
.nav-item:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-item.active{
  background:linear-gradient(90deg,rgba(59,130,246,.24),rgba(99,102,241,.12));
  color:#fff;font-weight:600;border-color:rgba(147,197,253,.22);
  box-shadow:inset 3px 0 0 #38bdf8;
}
.nav-item .ni{width:19px;height:19px;display:grid;place-items:center;flex:none;opacity:.9}
.nav-item .ni svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.nav-item .nl{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav-badge{
  flex:none;min-width:19px;height:19px;padding:0 5px;border-radius:999px;
  background:#f43f5e;color:#fff;font-size:10.5px;font-weight:700;
  display:inline-flex;align-items:center;justify-content:center;
  box-shadow:0 0 0 3px rgba(244,63,94,.15);
}

/* ---------- 侧栏底部 ---------- */
.side-foot{padding:15px 16px 17px;border-top:1px solid rgba(255,255,255,.08)}
.lv-box{display:flex;gap:10px;align-items:center}
.lv-badge{
  width:40px;height:40px;flex:none;border-radius:11px;background:rgba(139,92,246,.18);
  color:#c4b5fd;font-weight:700;font-size:12px;display:grid;place-items:center;
  border:1px solid rgba(196,181,253,.18);
}
.lv-meta{flex:1;min-width:0}
.lv-name{font-size:12.5px;font-weight:600;color:#e2edf9}
.lv-bar{height:5px;border-radius:3px;background:rgba(255,255,255,.12);overflow:hidden;margin-top:5px;width:100%}
.lv-bar i{display:block;height:100%;background:linear-gradient(90deg,#38bdf8,#a855f7);width:0%;transition:width .4s}
.side-note{font-size:10.5px;color:#7f9cbd;margin-top:10px}

/* ---------- 顶栏 ---------- */
.topbar{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:16px 28px 12px;background:rgba(242,246,253,.8);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(148,163,184,.14);
  flex:none;position:relative;z-index:20;
}
.topbar-left{display:flex;align-items:center;gap:10px;min-width:0}
.topbar h1{font-size:19px;font-weight:700;letter-spacing:.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar p{font-size:12.5px;color:var(--muted);margin-top:2px}
.top-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.chip{
  background:rgba(255,255,255,.82);border:1px solid rgba(148,163,184,.28);border-radius:999px;
  padding:5px 12px;font-size:12.5px;color:var(--text-2);white-space:nowrap;
  box-shadow:0 1px 2px rgba(15,23,42,.03);
}
.chip b{color:var(--primary-dark);font-weight:700}
.menu-btn{display:none;font-size:17px;padding:5px 9px}

/* ---------- 卡片 ---------- */
.card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:19px;box-shadow:var(--shadow);
  transition:box-shadow .22s ease,border-color .22s ease,transform .22s ease;
}
.card:hover{box-shadow:0 12px 34px rgba(30,64,175,.09);border-color:#cfdcf0}
.card + .card{margin-top:16px}
.card h3{font-size:14.5px;font-weight:700;margin-bottom:12px;letter-spacing:.2px;
  display:flex;align-items:center;gap:8px}
.card h3::before{content:"";width:4px;height:15px;border-radius:3px;
  background:linear-gradient(180deg,#2563eb,#7c3aed);flex:none}
.card.center h3{justify-content:center}
.card-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.card-head h3{margin-bottom:10px}
.card-head.tight h3{margin-bottom:0}
.card-head.tight{margin-bottom:10px}
.center{text-align:center}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}
.grid-2 > .card,.grid-3 > .card{margin-top:0}
.grid-2 + .card,.grid-3 + .card,.card + .grid-2,.card + .grid-3{margin-top:16px}
.muted{color:var(--muted)}
.small{font-size:12px}
.big-text{font-size:16px;font-weight:700;margin-top:6px}
.big-num{font-size:30px;font-weight:800;color:var(--primary);line-height:1.1}
.big-cap{font-size:13px;color:var(--muted);margin-top:4px}
.row-gap{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.pre-wrap{white-space:pre-wrap}
canvas{display:block;width:100%}

/* ---------- 按钮 ---------- */
.btn{
  border:1px solid var(--border);background:var(--surface);color:var(--text-2);
  padding:7px 15px;border-radius:10px;cursor:pointer;transition:.18s;font-size:13px;
  min-height:34px;display:inline-flex;align-items:center;justify-content:center;gap:6px;
  font-weight:500;
}
.btn:hover{background:var(--surface-3);border-color:#c7d5ea;color:var(--text);transform:translateY(-1px)}
.btn.primary{background:linear-gradient(135deg,#2563eb,#4f46e5);border-color:transparent;color:#fff;font-weight:600;
  box-shadow:0 8px 20px rgba(37,99,235,.24)}
.btn.primary:hover{background:linear-gradient(135deg,#1d4ed8,#4338ca);border-color:transparent;color:#fff;
  box-shadow:0 10px 26px rgba(37,99,235,.32)}
.btn.danger{color:var(--red);border-color:#f3c6c8}
.btn.danger:hover{background:var(--red-soft)}
.btn.big{width:100%;padding:11px;margin-top:14px;font-size:14px}
.btn.tiny{padding:3px 10px;font-size:11.5px;border-radius:8px;min-height:26px}
.btn.ghost{border-color:transparent;background:transparent}
.btn.ghost:hover{background:var(--surface-3)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
button.link{
  border:0;background:none;color:var(--primary);font-size:12.5px;padding:2px 0;
  text-decoration:none;cursor:pointer;align-self:flex-start;
}
button.link:hover{text-decoration:underline}

/* ---------- 统计格 ---------- */
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.stat{background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid var(--border-2);border-radius:12px;padding:11px 13px}
.stat .k{font-size:11.5px;color:var(--muted)}
.stat .v{font-size:19px;font-weight:700;margin-top:2px;letter-spacing:.2px;color:#0f2a52}

/* ---------- 驾驶舱问候 ---------- */
.hello-strip{
  position:relative;overflow:hidden;
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  background:linear-gradient(118deg,#e8f1ff 0%,#eef0ff 46%,#f8fbff 100%);
  border:1px solid #d8e4fb;border-radius:18px;padding:18px 22px;margin-bottom:16px;
  box-shadow:0 10px 30px rgba(37,99,235,.06);
}
.hello-strip::after{
  content:"∑  λ  A⁻¹";position:absolute;right:22px;bottom:-26px;
  font:700 64px/1 "Songti SC","SimSun",serif;letter-spacing:10px;
  color:rgba(37,99,235,.06);pointer-events:none;white-space:nowrap;
}
.hello-main,.hello-side{position:relative;z-index:1}
.hello-title{font-size:18px;font-weight:700;letter-spacing:.3px}
.hello-sub{font-size:12.5px;color:var(--text-2);margin-top:3px}
.hello-sub b{color:var(--primary-dark)}
.hello-side{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--text-2)}
.risk-dot{width:9px;height:9px;border-radius:50%;display:inline-block;box-shadow:0 0 0 4px rgba(220,38,38,.08)}
.ring-legend{display:flex;gap:9px;flex-wrap:wrap;justify-content:center;margin-top:8px;font-size:11px;color:var(--muted)}
.ring-legend span{display:inline-flex;align-items:center;gap:4px}
.ring-legend i{width:8px;height:8px;border-radius:2px;display:inline-block}

/* ---------- 今日任务 ---------- */
.task-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.task{
  display:flex;gap:10px;align-items:flex-start;padding:13px;
  border:1px solid var(--border);border-radius:13px;background:linear-gradient(180deg,#fff,#f9fbff);
  transition:.18s;
}
.task:hover{border-color:#c7d8f2;box-shadow:0 8px 20px rgba(37,99,235,.07)}
.task.done{background:linear-gradient(180deg,#f2fcf5,#e9f8ee);border-color:#c8ebd4}
.task-ico{width:22px;height:22px;flex:none;border-radius:50%;display:grid;place-items:center;
  background:var(--surface);border:1px solid var(--border);color:var(--muted);font-size:12px;font-weight:700}
.task.done .task-ico{background:var(--green);border-color:var(--green);color:#fff}
.task-body{flex:1;min-width:0}
.task-title{font-size:13px;font-weight:600;line-height:1.4}
.task-text{font-weight:400;color:var(--muted);font-size:11.8px;display:block;margin-top:2px}
.task-bar{height:5px;background:var(--border);border-radius:3px;overflow:hidden;margin-top:7px}
.task-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--violet))}

/* ---------- 预警 ---------- */
.warn-list{display:flex;flex-direction:column;gap:8px;max-height:292px;overflow-y:auto;padding-right:3px}
.warn{border-radius:9px;padding:9px 11px;border-left:3px solid;background:var(--surface-2);font-size:12.5px}
.warn.lv3{border-color:var(--red);background:var(--red-soft)}
.warn.lv2{border-color:var(--orange);background:var(--orange-soft)}
.warn.lv1{border-color:var(--violet);background:var(--violet-soft)}
.warn .t{font-weight:700;margin-bottom:2px}
.warn .a{color:var(--text-2);font-size:12px}
.warn button.link{margin-top:4px;font-size:11.8px}
.ok-box{color:var(--green);font-size:13px;padding:14px;text-align:center;background:var(--green-soft);border-radius:9px;line-height:1.7}

/* ---------- 建议 ---------- */
.advice{display:flex;flex-direction:column;gap:11px}
.adv{display:flex;gap:10px;align-items:flex-start}
.adv .n{width:22px;height:22px;flex:none;border-radius:7px;background:var(--primary-soft);
  color:var(--primary-dark);font-size:11.5px;font-weight:700;display:grid;place-items:center;margin-top:1px}
.adv .c{font-size:13px;color:var(--text-2)}
.adv .c b{display:block;margin-bottom:1px;color:var(--text)}

/* ---------- 概览条 ---------- */
.summary-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:16px;
}
.sum-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:12px 14px;box-shadow:var(--shadow)}
.sum-item .k{font-size:11.5px;color:var(--muted)}
.sum-item .v{font-size:17px;font-weight:700;margin-top:2px}

/* ---------- 表格 ---------- */
.table-wrap{max-height:460px;overflow:auto;border:1px solid var(--border-2);border-radius:10px}
.tbl{width:100%;border-collapse:collapse;font-size:12.8px;min-width:760px}
.tbl th{position:sticky;top:0;background:var(--surface-2);text-align:left;
  padding:9px 12px;font-weight:700;border-bottom:1px solid var(--border);z-index:1;white-space:nowrap}
.tbl td{padding:8px 12px;border-bottom:1px solid var(--border-2);vertical-align:middle}
.tbl tr:last-child td{border-bottom:0}
.tbl tbody tr:hover{background:var(--surface-2)}
.pill{display:inline-block;padding:1px 8px;border-radius:999px;font-size:11px;font-weight:600;color:#fff;white-space:nowrap}
.bar-mini{height:6px;background:var(--border);border-radius:3px;overflow:hidden;min-width:70px}
.bar-mini i{display:block;height:100%;border-radius:3px}
.tbl td.c-bad{color:var(--red);font-weight:700}
.tbl td.c-warn{color:var(--orange)}

/* ---------- 筛选 ---------- */
.filters{display:flex;gap:6px;flex-wrap:wrap}
.fbtn{border:1px solid var(--border);background:var(--surface);color:var(--text-2);
  padding:4px 11px;border-radius:999px;cursor:pointer;font-size:12px}
.fbtn:hover{border-color:var(--primary-2);color:var(--primary)}
.fbtn.on{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}

/* ---------- 答疑 ---------- */
.ask-box{display:flex;gap:10px;align-items:flex-start}
.ask-box textarea{flex:1;padding:11px 13px;border:1px solid var(--border);border-radius:10px;
  resize:vertical;background:var(--surface-2);font-size:13.5px;line-height:1.6;min-height:88px}
.ask-box textarea:focus{outline:0;border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.faq{display:flex;gap:7px;flex-wrap:wrap;margin-top:2px}
.faq button{border:1px solid var(--border);background:var(--surface-2);color:var(--text-2);
  padding:5px 11px;border-radius:999px;cursor:pointer;font-size:12px;text-align:left}
.faq button:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-soft)}
.ans-h{display:flex;align-items:center;gap:9px;margin-bottom:11px;flex-wrap:wrap}
.ans-h h4{font-size:15.5px;font-weight:700}
.tagline{font-size:11.5px;color:#fff;padding:2px 8px;border-radius:999px;background:var(--violet);white-space:nowrap}
.tagline.g{background:var(--green)}
.sec{margin-top:13px}
.sec .lb{font-size:12px;font-weight:700;color:var(--text-2);margin-bottom:5px}
.sec p,.sec li{font-size:13px;color:var(--text-2)}
.sec ul,.sec ol{padding-left:20px}
.sec ul li,.sec ol li{margin-bottom:4px}
.kws{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.kw{background:var(--primary-soft);color:var(--primary-dark);padding:2px 9px;border-radius:6px;
  font-size:11.5px;font-weight:600;border:1px solid transparent;font-family:inherit}
button.kw{cursor:pointer}
button.kw:hover{border-color:var(--primary)}
.kw.static{font-weight:500}
.kw.good{background:var(--green-soft);color:var(--green)}
.kw.bad{background:var(--red-soft);color:#a3272b}
.kw.warn-tag{background:var(--orange-soft);color:#b45309}
.pit{background:var(--red-soft);border-left:3px solid var(--red);padding:8px 11px;border-radius:8px;
  font-size:12.5px;color:#7a2b2e;margin-bottom:6px}
.qcard{border:1px solid var(--border);border-radius:10px;padding:11px 13px;margin-bottom:8px;background:var(--surface-2)}
.qcard .s{font-size:13px;margin-bottom:4px}
.qcard .m{font-size:11.5px;color:var(--muted);margin-bottom:6px}
.qcard .qopts{font-size:12.5px;color:var(--text-2);margin:5px 0}
.qcard details summary{cursor:pointer;font-size:12px;color:var(--primary);font-weight:600}
.qcard details p{font-size:12.5px;color:var(--text-2);margin-top:6px}
.tutor-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:16px;align-items:start}
.tutor-side{display:flex;flex-direction:column;gap:16px}
.ask-box.big-ask{margin-top:14px;padding-top:13px;border-top:1px solid var(--border-2);flex-direction:column}
.ask-box.big-ask textarea{width:100%;min-height:112px;font-size:14.5px;line-height:1.75}
.ask-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:9px;width:100%;flex-wrap:wrap}
.ask-foot .hint{font-size:11.5px;color:var(--muted)}
.panel{font-size:12.8px;color:var(--text-2);line-height:1.7}
.panel .pk{font-weight:700;color:var(--text);font-size:13.5px;margin-bottom:5px}
.panel .pmeta{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:9px}
.panel .psec{margin-top:10px}
.panel .plb{font-size:11.8px;font-weight:700;color:var(--text-2);margin-bottom:3px}
.chat-card{padding-bottom:12px}
.chat-head{display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding-bottom:10px;border-bottom:1px solid var(--border-2);margin-bottom:12px;flex-wrap:wrap}
.chat-ctrl{display:flex;gap:9px;align-items:center}
.chat-body{min-height:70px;max-height:560px;overflow-y:auto;padding-right:4px;scroll-behavior:smooth}
.bubble{display:flex;margin-bottom:13px}
.bubble.me{justify-content:flex-end}
.bt{max-width:86%;padding:11px 15px;border-radius:12px;font-size:13.5px;line-height:1.72;overflow-wrap:anywhere}
.bubble.me .bt{background:var(--primary);color:#fff;border-bottom-right-radius:4px}
.bubble.ai .bt{background:var(--surface-2);border:1px solid var(--border-2);color:var(--text);border-bottom-left-radius:4px}
.bubble.ai .bt .sec:first-child,.bubble.ai .bt .md:first-child{margin-top:0}
.bubble-tools{display:flex;justify-content:flex-end;margin-top:8px}
.bubble-tools .link{font-size:11.5px;color:var(--muted)}
.typing{display:inline-flex;gap:3px;margin-right:8px;vertical-align:middle}
.typing i{width:5px;height:5px;border-radius:50%;background:var(--primary);animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}
.mbar{height:7px;background:var(--border);border-radius:4px;overflow:hidden;margin-top:7px}
.mbar i{display:block;height:100%}

/* ---------- Markdown ---------- */
.md{font-size:13.5px;line-height:1.75;color:var(--text-2)}
.md p{margin:0 0 8px}
.md h3,.md h4,.md h5,.md h6{color:var(--text);font-size:14px;margin:12px 0 6px}
.md ul,.md ol{padding-left:21px;margin:4px 0 8px}
.md li{margin-bottom:3px}
.md strong{color:var(--text)}
.md code{background:#eef2f7;padding:1px 6px;border-radius:4px;font-family:Consolas,Monaco,monospace;font-size:12px;color:var(--violet)}
.md pre{background:#0f172a;color:#e2e8f0;padding:12px;border-radius:9px;overflow:auto;margin:8px 0}
.md pre code{background:none;color:inherit;padding:0;font-size:12.5px}
.md blockquote{border-left:3px solid var(--border);padding:2px 10px;color:var(--muted);margin:8px 0}
.md hr{border:0;border-top:1px solid var(--border);margin:12px 0}
.md-table{overflow-x:auto;margin:8px 0}
.md table{border-collapse:collapse;font-size:12.5px;width:100%}
.md th,.md td{border:1px solid var(--border);padding:6px 9px;text-align:left}
.md th{background:var(--surface-2)}

/* ---------- 路径 ---------- */
.path-overview{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.po-item{background:var(--surface-2);border:1px solid var(--border-2);border-radius:10px;padding:11px 13px;text-align:center}
.po-item .k{font-size:11.5px;color:var(--muted)}
.po-item .v{font-size:20px;font-weight:700;margin-top:2px;letter-spacing:.2px}
.ch-progress{display:flex;flex-direction:column;gap:7px}
.cp-row{display:grid;grid-template-columns:132px 1fr 44px 66px;gap:10px;align-items:center;font-size:12.3px}
.cp-n{color:var(--text-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cp-b{height:8px;background:var(--border);border-radius:4px;overflow:hidden}
.cp-b i{display:block;height:100%;border-radius:4px;transition:width .4s}
.cp-v{text-align:right;font-weight:700}
.cp-w{text-align:right;color:var(--muted);font-size:11.5px}
.sec-t{font-size:13.5px;font-weight:700;color:var(--text-2);margin:18px 0 9px;padding-left:9px;border-left:3px solid var(--primary)}
.graph-legend{display:flex;gap:12px;flex-wrap:wrap;font-size:11.5px;color:var(--muted);margin-bottom:8px;align-items:center}
.graph-legend span{display:inline-flex;align-items:center;gap:5px}
.graph-legend i{width:10px;height:10px;border-radius:3px;display:inline-block}
.graph-wrap{border:1px solid var(--border-2);border-radius:10px;background:var(--surface-2);padding:8px;overflow-x:auto}
.gnode{cursor:pointer}
.gnode:hover rect,.gnode:focus-visible rect{stroke-width:2.6}
.gnode.sel rect{stroke-width:3;filter:drop-shadow(0 0 3px rgba(37,99,235,.5))}
.gnode text{pointer-events:none;user-select:none}
.kp-detail{margin-top:12px;border:1px solid var(--border);border-radius:11px;padding:14px 16px;background:#fff}
.kp-h{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.kp-s{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:6px}
.path-item{display:flex;gap:13px;border:1px solid var(--border);border-radius:11px;
  padding:13px 15px;margin-bottom:9px;background:var(--surface-2)}
.path-item.review{border-left:3px solid var(--orange)}
.path-item .idx{width:28px;height:28px;flex:none;border-radius:8px;background:var(--primary);
  color:#fff;font-weight:700;font-size:12.5px;display:grid;place-items:center;margin-top:1px}
.path-item .bd{flex:1;min-width:0}
.path-item .nm{font-weight:700;font-size:14px;margin-bottom:3px}
.path-item .meta{font-size:11.5px;color:var(--muted);display:flex;gap:11px;flex-wrap:wrap;margin-bottom:7px}
.path-item .why{font-size:12.5px;color:var(--text-2);background:#fff;border-radius:8px;padding:8px 10px;border:1px solid var(--border-2)}
.path-item .why b{color:var(--text)}

/* ---------- 训练 ---------- */
.setup-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}
.fld{display:flex;flex-direction:column;gap:5px;font-size:12.5px;color:var(--text-2)}
.fld select,.fld input{padding:8px 11px;border:1px solid var(--border);border-radius:8px;background:var(--surface-2);min-height:38px}
.fld select:focus,.fld input:focus{outline:0;border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.mini{font-size:12px;color:var(--muted);display:inline-flex;align-items:center;gap:6px}
.mini select{padding:5px 9px;border:1px solid var(--border);border-radius:7px;background:var(--surface)}
.focus-bar{display:flex;align-items:center;gap:10px;background:var(--primary-soft);border:1px solid #cfe0fd;
  border-radius:9px;padding:8px 12px;font-size:12.5px;margin-bottom:12px;color:var(--primary-dark)}
.q-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;flex-wrap:wrap;gap:8px}
.q-prog{font-size:12.5px;color:var(--muted)}
.q-prog-bar{height:5px;background:var(--border);border-radius:3px;overflow:hidden;margin-bottom:14px}
.q-prog-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--violet));transition:width .3s}
.q-stem{font-size:15px;line-height:1.8;margin-bottom:14px;white-space:pre-wrap}
.opts{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
.opt{display:flex;gap:10px;align-items:flex-start;padding:10px 13px;text-align:left;width:100%;
  border:1px solid var(--border);border-radius:9px;cursor:pointer;background:var(--surface-2);transition:.15s;font-size:13.5px}
.opt:hover{border-color:var(--primary);background:var(--primary-soft)}
.opt.on{border-color:var(--primary);background:var(--primary-soft);box-shadow:0 0 0 2px rgba(37,99,235,.15)}
.opt .lt{font-weight:700;color:var(--primary);flex:none}
.ans-in{width:100%;padding:10px 13px;border:1px solid var(--border);border-radius:9px;
  background:var(--surface-2);font-size:13.5px;margin-bottom:12px}
.ans-in:focus{outline:0;border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.fb{border-radius:10px;padding:13px 15px;margin-bottom:12px}
.fb.ok{background:var(--green-soft);border-left:3px solid var(--green)}
.fb.no{background:var(--red-soft);border-left:3px solid var(--red)}
.fb .h{font-weight:700;margin-bottom:5px}
.fb .d{font-size:13px;color:var(--text-2);white-space:pre-wrap;line-height:1.75}
.tagpick{display:flex;gap:6px;flex-wrap:wrap;margin-top:9px}
.tp{border:1px dashed var(--border);background:#fff;color:var(--text-2);padding:4px 10px;border-radius:999px;cursor:pointer;font-size:11.5px}
.tp.on{background:var(--orange);color:#fff;border-style:solid;border-color:var(--orange);font-weight:600}

/* ---------- 错题 ---------- */
.wrong-item{border:1px solid var(--border);border-radius:10px;padding:12px 14px;margin-bottom:9px;background:var(--surface-2)}
.wrong-item .hd{display:flex;justify-content:space-between;gap:10px;align-items:flex-start;flex-wrap:wrap}
.wrong-item .hd .st{font-size:12px;color:var(--muted)}
.wrong-item .stem{font-size:13.3px;margin:7px 0}
.box-lv{display:inline-block;padding:1px 8px;border-radius:6px;font-size:11px;font-weight:700;color:#fff;background:var(--orange)}
.empty{text-align:center;color:var(--muted);padding:26px;font-size:13px;line-height:1.8}
.legend{margin-top:10px;justify-content:center}

/* ---------- 徽章 / 打卡 ---------- */
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:11px}
.badge{border:1px solid var(--border);border-radius:11px;padding:13px 10px;text-align:center;
  background:var(--surface-2);opacity:.46;transition:.2s}
.badge.got{opacity:1;background:var(--primary-soft);border-color:#bcd8fb}
.badge .ic{font-size:22px;margin-bottom:5px}
.badge .bn{font-size:12.5px;font-weight:700}
.badge .bd{font-size:10.8px;color:var(--muted);margin-top:2px;line-height:1.45}
.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:5px}
.cd{min-height:34px;border-radius:7px;background:var(--border-2);display:flex;flex-direction:column;
  align-items:center;justify-content:center;font-size:10.5px;color:var(--muted);line-height:1.1}
.cd small{font-size:8.5px;opacity:.8}
.cd.on{background:var(--primary);color:#fff;font-weight:700}

/* ---------- 设置 ---------- */
.note-box{background:var(--primary-soft);border-left:3px solid var(--primary);border-radius:8px;
  padding:9px 12px;font-size:12.3px;color:var(--text-2);margin:9px 0;line-height:1.65}
.note-box.ok{background:var(--green-soft);border-left-color:var(--green)}
.guide{display:flex;flex-direction:column;gap:9px}
.g-item{border:1px solid var(--border-2);border-radius:9px;padding:10px 13px;background:var(--surface-2)}
.g-t{font-size:12.8px;font-weight:700;color:var(--text);margin-bottom:3px}
.g-c{font-size:12.3px;color:var(--text-2);line-height:1.6}
code{background:#eef2f7;padding:1px 6px;border-radius:4px;font-family:Consolas,Monaco,monospace;font-size:11.5px;color:var(--violet)}
.chk{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-2);margin:8px 0}
.chk input{width:16px;height:16px;accent-color:var(--primary)}
.pass-wrap{position:relative;display:block}
.pass-wrap input{width:100%;padding-right:62px}
.pass-toggle{position:absolute;right:6px;top:50%;transform:translateY(-50%);
  border:0;background:transparent;color:var(--primary);font-size:12px;padding:4px 6px}
.data-box{width:100%;margin-top:10px;padding:10px 12px;border:1px solid var(--border);border-radius:9px;
  font-family:Consolas,Monaco,monospace;font-size:12px;background:var(--surface-2);resize:vertical}

/* ---------- 班级 ---------- */
.heat{display:flex;flex-direction:column;gap:9px;padding:4px 2px}
.heat-row{display:grid;grid-template-columns:68px 1fr 46px 44px;align-items:center;gap:8px;font-size:13px}
.heat-name{color:var(--text-2)}
.heat-bar{height:12px;background:var(--surface-2);border-radius:6px;overflow:hidden}
.heat-bar i{display:block;height:100%;border-radius:6px}
.heat-val{text-align:right;font-variant-numeric:tabular-nums;color:var(--text-2)}
.heat-flag{font-size:11px;color:var(--red);font-weight:700}
.risk-list,.top-list{display:flex;flex-direction:column;gap:10px}
.risk-item{border:1px solid var(--border);border-left:3px solid var(--red);border-radius:10px;padding:10px 12px}
.ri-top{display:flex;justify-content:space-between;align-items:center}
.ri-ov{color:var(--red);font-weight:700}
.ri-ch{font-size:12.5px;color:var(--muted);margin:4px 0}
.ri-tags{display:flex;flex-wrap:wrap;gap:6px}
.top-item{display:flex;align-items:center;gap:10px;padding:8px 4px;border-bottom:1px dashed var(--border-2)}
.top-rank{width:24px;height:24px;border-radius:50%;background:var(--primary-soft);color:var(--primary-dark);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px}
.top-ov{margin-left:auto;font-weight:700;color:var(--green)}

/* ---------- 视图 / Toast ---------- */
.view{display:none;animation:fade .2s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.toast{position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(16px);
  background:#0f172a;color:#fff;padding:9px 20px;border-radius:999px;font-size:13px;
  opacity:0;pointer-events:none;transition:.25s;z-index:200;max-width:90vw;text-align:center;box-shadow:var(--shadow-lg)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.err{background:#991b1b}

/* ---------- 分数 ---------- */
.frac{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;line-height:1.05;margin:0 2px}
.frac sup{border-bottom:1px solid currentColor;padding:0 2px}
.frac sub{padding:0 2px}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:5px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#94a3b8}
::-webkit-scrollbar-track{background:transparent}

/* ============================================================
 * 知识图谱
 * ============================================================ */
.sprite{display:none}
.kg-toolbar{display:grid;grid-template-columns:1fr auto;gap:12px 18px;align-items:center;padding:15px 18px;margin-bottom:16px}
.kg-stats{display:flex;gap:22px;flex-wrap:wrap}
.kg-stat{display:flex;flex-direction:column;line-height:1.15}
.kg-stat b{font-size:20px;font-weight:800;color:#0f2a52;letter-spacing:.2px}
.kg-stat span{font-size:11px;color:var(--muted);margin-top:3px}
.kg-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.kg-search{position:relative;display:flex;align-items:center}
.kg-search svg{position:absolute;left:10px;width:15px;height:15px;fill:none;stroke:#94a3b8;stroke-width:1.8;pointer-events:none}
.kg-search input{
  width:230px;padding:8px 12px 8px 33px;border:1px solid var(--border);border-radius:10px;
  background:var(--surface-2);font-size:12.5px;min-height:36px;
}
.kg-search input:focus{outline:0;border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.kg-weak{margin:0;white-space:nowrap}
.kg-zoom{display:inline-flex;align-items:center;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:#fff}
.kg-zbtn{border:0;background:#fff;color:var(--text-2);width:34px;height:34px;font-size:16px;line-height:1;cursor:pointer}
.kg-zbtn:hover{background:var(--primary-soft);color:var(--primary-dark)}
.kg-zbtn.wide{width:auto;padding:0 12px;font-size:12px;border-left:1px solid var(--border);border-right:1px solid var(--border)}
.kg-filter-row{grid-column:1/-1;display:flex;gap:10px;align-items:center;flex-wrap:wrap;border-top:1px dashed var(--border);padding-top:12px}
.kg-flabel{font-size:11.5px;color:var(--muted);flex:none}
.kg-fdot{display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:5px;vertical-align:1px}
.kg-layout{position:relative;display:block}
.kg-layout .card{margin-top:0}
.kg-canvas-card{padding:14px 14px 10px;overflow:hidden}
.kg-canvas-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding:0 2px}
.kg-canvas-head h3{margin:0}
.kg-canvas{
  height:740px;margin-top:10px;border-radius:13px;overflow:hidden;position:relative;
  background:radial-gradient(900px 420px at 50% 0%,#f9fcff 0%,#eef5fe 62%,#e8f0fb 100%);
  border:1px solid #e1eaf8;
}
.kg-svg{width:100%;height:100%;display:block;touch-action:none;cursor:grab;user-select:none}
.kg-svg.dragging{cursor:grabbing}
.kg-edge{fill:none;stroke-width:1.25;opacity:.34;transition:opacity .15s,stroke-width .15s}
.kg-edge.hot{opacity:.95;stroke-width:2}
.kg-edge.dim,.kg-edge.muted{opacity:.04}
.kg-node{cursor:pointer;outline:none}
.kg-box{fill:#fff;stroke:#dbe4f0;stroke-width:1.2;filter:drop-shadow(0 3px 6px rgba(15,23,42,.045));transition:stroke .15s,filter .15s}
.kg-node:hover .kg-box,.kg-node.hit .kg-box{stroke:#93b4f5}
.kg-node.hit .kg-box{stroke:#2563eb;stroke-width:2;filter:drop-shadow(0 7px 16px rgba(37,99,235,.18))}
.kg-node.sel .kg-box{stroke:#4f46e5;stroke-width:2.2;filter:drop-shadow(0 8px 18px rgba(79,70,229,.22))}
.kg-node:focus-visible .kg-box{stroke:#2563eb;stroke-width:2;stroke-dasharray:4 2}
.kg-node.dim{opacity:.16}
.kg-node.muted{opacity:.13;pointer-events:none}
.kg-name{font:600 12.5px system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;fill:#0f172a}
.kg-meta{font:10.5px system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;fill:#64748b}
.kg-progress-bg{fill:#eef2f7}
.kg-legend{display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:10.8px;color:var(--muted);padding:9px 4px 2px}
.kg-legend span{display:inline-flex;align-items:center;gap:4px}
.kg-legend i{width:8px;height:8px;border-radius:2px;display:inline-block}
.kg-legend .grow{flex:1}
.kg-detail{
  position:absolute;right:14px;top:58px;width:356px;max-height:calc(100% - 72px);
  overflow:auto;padding:18px;z-index:8;display:none;background:rgba(255,255,255,.98);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  box-shadow:0 22px 55px rgba(15,23,42,.2);border-color:#cfdcf0;
}
.kg-layout.has-selection .kg-detail{display:block}
.kg-d-close{position:absolute;right:10px;top:10px;width:28px;height:28px;border:1px solid var(--border);
  border-radius:50%;background:#fff;color:var(--muted);font-size:17px;line-height:1;cursor:pointer}
.kg-d-close:hover{color:var(--red);border-color:#f3c6c8;background:var(--red-soft)}
.kg-d-empty{text-align:center;padding:28px 8px}
.kg-d-icon{width:48px;height:48px;margin:0 auto 12px;border-radius:14px;background:var(--primary-soft);
  display:grid;place-items:center;color:var(--primary)}
.kg-d-icon svg{width:26px;height:26px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.kg-d-empty h3{justify-content:center;margin-bottom:6px}
.kg-d-empty h3::before{display:none}
.kg-d-suggest{margin-top:18px;text-align:left}
.kg-d-suggest .lb{font-size:11.5px;color:var(--muted);margin-bottom:7px}
.kg-sug{display:flex;justify-content:space-between;align-items:center;width:100%;padding:8px 10px;
  border:1px solid var(--border);border-radius:9px;background:var(--surface-2);margin-bottom:6px;
  font-size:12.5px;color:var(--text-2);cursor:pointer}
.kg-sug:hover{border-color:var(--primary);background:var(--primary-soft)}
.kg-sug b{color:var(--primary-dark)}
.kg-d-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;flex-wrap:wrap}
.kg-d-kicker{font-size:10.5px;color:var(--muted);letter-spacing:.4px;text-transform:uppercase}
.kg-d-head h3{margin:2px 0 0;font-size:17px;line-height:1.35}
.kg-d-head h3::before{display:none}
.kg-d-chips{display:flex;gap:6px;flex-wrap:wrap;margin:9px 0}
.kg-d-sec{margin-top:14px}
.kg-d-sec .lb{font-size:11.5px;font-weight:700;color:var(--text-2);margin-bottom:4px}
.kg-d-sec p,.kg-d-sec li{font-size:12.8px;color:var(--text-2);line-height:1.7}
.kg-d-sec ul{padding-left:18px}
.kg-d-sec .pit{margin-top:5px}
.kg-d-actions{margin-top:16px;padding-top:12px;border-top:1px dashed var(--border)}
.kg-detail .qcard{margin-bottom:7px}
.kg-detail .mbar{margin-top:8px}

/* ============================================================
 * 通知中心
 * ============================================================ */
.notif-wrap{position:relative}
.bell-btn{
  position:relative;width:36px;height:36px;border:1px solid var(--border);border-radius:50%;
  background:var(--surface);color:var(--text-2);display:grid;place-items:center;cursor:pointer;
  transition:.15s;
}
.bell-btn:hover{color:var(--primary);border-color:#bfdbfe;background:var(--primary-soft)}
.bell-btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.bell-btn.has-unread{color:var(--primary-dark);border-color:#bfdbfe;background:var(--primary-soft)}
.bell-badge{
  position:absolute;top:-4px;right:-4px;min-width:17px;height:17px;padding:0 4px;border-radius:999px;
  background:#f43f5e;color:#fff;font-size:10px;font-weight:700;display:inline-flex;align-items:center;
  justify-content:center;box-shadow:0 0 0 2px #fff;
}
.notif-panel{
  position:absolute;right:0;top:46px;width:360px;max-height:460px;overflow:auto;z-index:90;
  background:#fff;border:1px solid var(--border);border-radius:14px;box-shadow:0 24px 60px rgba(15,23,42,.22);
  padding:8px;
}
.notif-head{display:flex;justify-content:space-between;align-items:center;padding:8px 9px 8px;border-bottom:1px solid var(--border-2)}
.notif-head b{font-size:13px}
.notif-list{display:flex;flex-direction:column;gap:2px;padding-top:4px}
.notif-item{display:flex;gap:8px;width:100%;text-align:left;border:0;background:transparent;padding:9px 8px;border-radius:9px;cursor:pointer}
.notif-item:hover{background:var(--surface-2)}
.notif-item.unread{background:var(--primary-soft)}
.notif-dot{width:7px;height:7px;border-radius:50%;background:transparent;margin-top:6px;flex:none}
.notif-item.unread .notif-dot{background:var(--primary)}
.notif-body{min-width:0;display:flex;flex-direction:column;gap:2px}
.notif-body b{font-size:12.6px;color:var(--text);line-height:1.4}
.notif-body span{font-size:11.8px;color:var(--text-2);line-height:1.45}
.notif-body em{font-style:normal;font-size:10.5px;color:var(--muted);margin-top:2px}

/* ============================================================
 * 作业与测试
 * ============================================================ */
.assign-item{
  border:1px solid var(--border);border-radius:14px;padding:14px;margin-bottom:10px;
  background:linear-gradient(180deg,#fff,#f9fbff);
}
.assign-top{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.assign-title{font-weight:700;font-size:14.5px;flex:1;min-width:0}
.assign-type{font-size:10.8px;padding:2px 8px;border-radius:999px;background:var(--primary-soft);color:var(--primary-dark);font-weight:700;white-space:nowrap}
.assign-type.test{background:var(--violet-soft);color:var(--violet)}
.assign-status{font-size:10.8px;padding:2px 8px;border-radius:999px;font-weight:700;white-space:nowrap}
.assign-status.open{background:var(--primary-soft);color:var(--primary-dark)}
.assign-status.done{background:var(--green-soft);color:var(--green)}
.assign-status.doing{background:var(--orange-soft);color:#b45309}
.assign-status.closed,.assign-status.expired{background:var(--surface-3);color:var(--muted)}
.assign-meta{font-size:11.8px;color:var(--muted);margin-top:6px}
.assign-note{font-size:12.3px;color:var(--text-2);background:var(--surface-2);padding:6px 9px;border-radius:7px;margin-top:7px}
.assign-progress{height:6px;background:var(--border);border-radius:4px;overflow:hidden;margin-top:9px}
.assign-progress i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--violet));border-radius:4px}
.assign-stats{display:flex;gap:14px;flex-wrap:wrap;font-size:11.8px;color:var(--text-2);margin-top:8px}
.assign-stats b{color:var(--text)}
.assign-detail{margin-top:10px;border-top:1px dashed var(--border);padding-top:10px}
.assign-table{min-width:520px}
.assign-mini{font-size:11px;font-weight:700;padding:1px 7px;border-radius:999px;background:var(--surface-3);color:var(--muted)}
.assign-mini.ok{background:var(--green-soft);color:var(--green)}
.assign-mini.doing{background:var(--orange-soft);color:#b45309}
.assign-answers{margin-top:8px;border:1px solid var(--border-2);border-radius:8px;background:var(--surface-2);padding:7px 10px}
.assign-answers summary{cursor:pointer;font-size:12px;font-weight:600;color:var(--primary)}
.assign-answer-row{display:grid;grid-template-columns:44px 18px 1fr 1fr;gap:7px;font-size:11.8px;color:var(--text-2);padding:4px 0;border-bottom:1px dashed var(--border-2)}
.assign-answer-row:last-child{border-bottom:0}
.assign-answer-q{font-family:Consolas,Monaco,monospace;color:var(--muted)}
.ok-text{color:var(--green);font-weight:700}
.no-text{color:var(--red);font-weight:700}
.assign-result-card{margin-bottom:16px;border-color:#cfe0fd;background:linear-gradient(180deg,#f7faff,#fff)}
.assign-score{display:flex;align-items:baseline;gap:6px;margin:4px 0 2px}
.assign-score b{font-size:40px;line-height:1;font-weight:800;color:var(--primary-dark)}
.assign-score span{font-size:14px;color:var(--text-2)}
.assign-score small{font-size:11.5px;color:var(--muted);margin-left:6px}
.assign-review{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.assign-review-row{border:1px solid var(--border-2);border-left:3px solid var(--border);border-radius:8px;padding:9px 11px;background:#fff}
.assign-review-row.ok{border-left-color:var(--green)}
.assign-review-row.no{border-left-color:var(--red)}
.assign-review-head{display:flex;justify-content:space-between;gap:8px;font-size:12px}
.assign-review-stem{font-size:12.3px;color:var(--text-2);margin-top:4px}
.assign-review-ans{font-size:11.8px;color:var(--text-2);margin-top:4px}
.assign-review-row details{margin-top:5px;font-size:11.8px}
.assign-review-row summary{cursor:pointer;color:var(--primary)}
.assign-run-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;flex-wrap:wrap;margin-bottom:10px}
.assign-run-kicker{font-size:11px;color:var(--muted);letter-spacing:.3px}
.assign-run-title{font-size:18px;font-weight:700;margin-top:2px}
.assign-run-side{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.assign-timer{font-size:12.5px;font-weight:700;color:var(--primary-dark);background:var(--primary-soft);padding:3px 9px;border-radius:999px}
.assign-timer.urgent{color:#fff;background:var(--red)}
.assign-nav{display:flex;gap:5px;flex-wrap:wrap;margin:8px 0 14px}
.assign-q{width:28px;height:28px;border:1px solid var(--border);border-radius:7px;background:#fff;color:var(--text-2);font-size:11.5px;cursor:pointer}
.assign-q:hover{border-color:var(--primary)}
.assign-q.cur{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:700}
.assign-q.done{border-color:#86efac;background:var(--green-soft);color:var(--green)}
.assign-q.done.cur{background:var(--primary);color:#fff;border-color:var(--primary)}
@media (max-width:960px){
  .notif-panel{position:fixed;right:12px;top:72px;width:min(360px,calc(100vw - 24px));max-height:60vh}
  .assign-top{gap:6px}
  .assign-title{flex-basis:100%}
  .assign-run-title{font-size:16px}
}
@media (max-width:560px){
  .notif-panel{top:64px}
  .assign-item{padding:12px}
  .assign-stats{gap:9px}
  .assign-answer-row{grid-template-columns:38px 16px 1fr}
  .assign-answer-row span:last-child{grid-column:2 / -1}
  .assign-q{width:26px;height:26px}
}

/* ============================================================
 * 登录 / Demo 入口
 * ============================================================ */
body.logged-out .app{display:none}
body.logged-in #login{display:none}
#login{
  position:fixed;inset:0;z-index:100;
  background:
    radial-gradient(900px 520px at 8% 4%,rgba(56,189,248,.18),transparent 55%),
    radial-gradient(800px 500px at 96% 96%,rgba(168,85,247,.2),transparent 55%),
    linear-gradient(140deg,#061426 0%,#0b2547 52%,#1e3a8a 100%);
  display:flex;align-items:center;justify-content:center;padding:24px;overflow:auto}
.login-wrap{
  width:100%;max-width:1000px;display:grid;grid-template-columns:1.05fr 1fr;gap:0;
  background:var(--surface);border-radius:22px;overflow:hidden;box-shadow:0 34px 90px rgba(4,12,28,.52);
  border:1px solid rgba(255,255,255,.1);
}
.login-hero{position:relative;overflow:hidden;padding:40px 36px;color:#fff;
  background:linear-gradient(155deg,#071a33 0%,#0f3a74 46%,#3b5bdb 100%);
  display:flex;flex-direction:column;justify-content:center}
.login-hero::after{
  content:"∑  λ";position:absolute;right:-10px;bottom:-34px;
  font:700 120px/1 "Songti SC","SimSun",serif;color:rgba(255,255,255,.055);
  letter-spacing:12px;pointer-events:none;white-space:nowrap;
}
.login-hero > *{position:relative;z-index:1}
.login-hero .brand-mark.big{width:64px;height:64px;border-radius:18px;font-size:33px;margin-bottom:18px;
  background:linear-gradient(140deg,#38bdf8,#6366f1 55%,#a855f7);
  border:1px solid rgba(255,255,255,.35);box-shadow:0 12px 30px rgba(56,189,248,.3)}
.login-hero h1{font-size:28px;margin:0 0 6px;letter-spacing:1.5px}
.hero-sub{color:#cfe2fb;margin:0 0 16px;font-weight:600;letter-spacing:.6px}
.hero-desc{color:#dbe9fb;line-height:1.75;font-size:13.5px;margin:0 0 16px}
.hero-points{list-style:none;margin:0 0 18px;display:flex;flex-direction:column;gap:8px}
.hero-points li{font-size:13px;color:#eaf3ff;display:flex;gap:9px;align-items:center}
.hero-points b{width:22px;height:22px;border-radius:6px;background:rgba(255,255,255,.18);
  display:grid;place-items:center;font-size:11px;flex:none}
.hero-tags{display:flex;flex-wrap:wrap;gap:7px}
.hero-tags span{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);
  color:#eaf3ff;font-size:12px;padding:4px 10px;border-radius:999px}
.login-side{padding:26px 28px;display:flex;flex-direction:column;gap:16px;max-height:92vh;overflow:auto}
.login-card h3{margin:0 0 10px;font-size:16px}
.login-msg{font-size:13px;min-height:20px;margin:2px 0 8px}
.login-msg.err{color:var(--red)}
.acct-cards{display:flex;flex-direction:column;gap:9px}
.acct-card{border:1px solid var(--border);border-radius:12px;padding:11px 13px;background:var(--surface-2);transition:.15s}
.acct-card:hover{border-color:#c7d7f2;background:#fff;box-shadow:var(--shadow)}
.ac-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.ac-u{font-weight:700;font-size:14px;font-family:ui-monospace,Menlo,Consolas,monospace}
.ac-line{display:flex;gap:8px;font-size:12px;color:var(--text-2);margin:3px 0;align-items:flex-start}
.ac-line>span:first-child{flex:0 0 40px;color:var(--muted)}
.ac-line code{background:#eef2f7;padding:1px 7px;border-radius:6px;font-size:11.5px}
.ac-perm{flex:1;line-height:1.5}
.acct-card .btn.tiny.fill{margin-top:8px;width:100%;background:var(--primary-soft);border-color:#cfe0fd;color:var(--primary-dark);font-weight:600}
.acct-card .btn.tiny.fill:hover{background:#dbe8fd}
.profile-summary .stat .v{font-size:15px}
.role-badge{font-size:11.5px;padding:2px 9px;border-radius:999px;font-weight:600;white-space:nowrap}
.role-badge.r-student{background:#e8f1fe;color:#1d6fd6}
.role-badge.r-teacher{background:#f0ebfe;color:#6d28d9}
.role-badge.r-guest{background:#fff1e6;color:#b45309}

/* 账号信息条 */
.acct-bar{display:flex;align-items:center;gap:9px;margin-left:4px;
  padding:4px 5px 4px 9px;border:1px solid var(--border);border-radius:999px;background:var(--surface)}
.acct-ava{width:31px;height:31px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--violet));
  color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex:0 0 auto}
.acct-meta{line-height:1.25;min-width:0}
.acct-name{font-size:12.5px;font-weight:600;white-space:nowrap}
.acct-sub{display:flex;align-items:center;gap:6px;font-size:11px;color:var(--muted)}
.acct-valid{color:#b45309}

/* 移动端抽屉 */
.drawer-scrim{position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:50}

/* ============================================================
 * 响应式
 * ============================================================ */
@media (max-width:1180px){
  .grid-3{grid-template-columns:1fr 1fr}
  .grid-3 > .card:last-child{grid-column:1 / -1}
  .task-grid{grid-template-columns:1fr 1fr}
  .tutor-layout{grid-template-columns:1fr}
  .tutor-side{display:grid;grid-template-columns:1fr 1fr;align-items:start}
  .kg-layout{grid-template-columns:minmax(0,1fr) 320px}
  .kg-search input{width:190px}
  .kg-stats{gap:15px}
}
@media (max-width:960px){
  :root{--sidebar:260px}
  .sidebar{position:fixed;left:0;top:0;bottom:0;transform:translateX(-100%);transition:transform .22s ease;
    box-shadow:0 0 40px rgba(15,23,42,.25)}
  .sidebar.open{transform:translateX(0)}
  .drawer-close{display:block}
  .menu-btn{display:inline-flex}
  .content{padding:16px 18px 40px}
  .topbar{padding:14px 18px 10px}
  .grid-2{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr}
  .grid-3 > .card:last-child{grid-column:auto}
  .summary-strip{grid-template-columns:1fr 1fr}
  .path-overview{grid-template-columns:1fr 1fr}
  .task-grid{grid-template-columns:1fr}
  .top-actions .chip{display:none}
  .acct-meta{display:none}
  .acct-bar{padding:3px 5px;gap:6px}
  .kg-layout{display:block}
  .kg-detail{position:static;width:auto;max-height:none;margin-top:16px;
    display:none;box-shadow:var(--shadow);backdrop-filter:none}
  .kg-layout.has-selection .kg-detail{display:block}
  .kg-canvas{height:600px}
  .kg-toolbar{grid-template-columns:1fr}
  .kg-controls{justify-content:flex-start}
  .kg-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
}
@media (max-width:760px){
  .tutor-side{grid-template-columns:1fr}
  .setup-grid{grid-template-columns:1fr}
  .cp-row{grid-template-columns:96px 1fr 40px 56px;font-size:11.8px}
  .hello-strip{padding:14px}
  .hello-title{font-size:16px}
  .topbar h1{font-size:17px}
  .topbar p{font-size:12px}
  .q-stem{font-size:14px}
  .bt{max-width:94%}
}
@media (max-width:880px){
  .login-wrap{grid-template-columns:1fr;max-width:520px}
  .login-hero{display:none}
  .login-side{max-height:none;padding:24px}
}
@media (max-width:560px){
  .content{padding:14px 12px 36px}
  .topbar{padding:12px 12px 8px}
  .card{padding:14px}
  .path-overview{grid-template-columns:1fr 1fr}
  .stat-grid{grid-template-columns:1fr 1fr}
  .summary-strip{grid-template-columns:1fr}
  .task-title{font-size:12.5px}
  .warn-list{max-height:none}
  .chat-body{max-height:none}
  .login-side{padding:18px}
  .acct-card{padding:10px}
  .kg-canvas{height:470px}
  .kg-search{flex:1}
  .kg-search input{width:100%}
  .kg-stats{grid-template-columns:repeat(3,1fr)}
  .kg-legend .grow{display:none}
  .kg-legend .muted{display:none}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

@media print{
  .sidebar,.topbar,.drawer-scrim,.toast,.skip-link,.ask-box,.btn{display:none!important}
  .app,.main,.content{display:block;height:auto;overflow:visible}
  .content{padding:0}
  .view{display:none!important}
  .view.active{display:block!important}
  .card{box-shadow:none;break-inside:avoid;border:1px solid #ddd}
  body{background:#fff}
}

/* 图谱样式定义在响应式规则之后，这里再声明一次窄屏覆盖，避免被基础规则反向覆盖 */
@media (max-width:960px){
  .kg-layout{display:block}
  .kg-detail{position:relative;right:auto;top:auto;width:auto;max-height:none;margin-top:16px;
    display:none;box-shadow:var(--shadow);backdrop-filter:none;-webkit-backdrop-filter:none}
  .kg-layout.has-selection .kg-detail{display:block}
  .kg-canvas{height:560px}
  .kg-toolbar{grid-template-columns:1fr}
  .kg-controls{justify-content:flex-start}
  .kg-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
}
@media (max-width:560px){
  .kg-canvas{height:470px}
  .kg-search{flex:1;min-width:0}
  .kg-search input{width:100%}
  .kg-stats{grid-template-columns:repeat(3,1fr)}
  .kg-stat b{font-size:17px}
  .kg-legend .grow,.kg-legend .muted{display:none}
}

/* ============================================================
 * 合规与隐私
 * ============================================================ */
.demo-pill{
  display:inline-block;margin-left:5px;padding:0 5px;border-radius:4px;
  background:rgba(56,189,248,.18);border:1px solid rgba(56,189,248,.35);
  color:#7dd3fc;font-size:8.5px;font-weight:700;letter-spacing:.6px;vertical-align:2px;
}
.compliance-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.compliance-item{border:1px solid var(--border-2);border-radius:12px;padding:12px 14px;background:var(--surface-2)}
.ci-t{font-size:12.5px;font-weight:700;color:var(--text)}
.ci-c{font-size:12.1px;color:var(--text-2);line-height:1.68;margin-top:4px}
.ci-c b{color:var(--text)}
@media (max-width:760px){
  .compliance-grid{grid-template-columns:1fr}
}