:root{
  --bg:#0a0e17;
  --bg-2:#0f1626;
  --panel:rgba(20,28,44,.72);
  --panel-2:rgba(26,35,54,.9);
  --line:rgba(126,152,196,.16);
  --line-strong:rgba(126,152,196,.3);
  --txt:#e8eefb;
  --txt-2:#9bb0cd;
  --txt-3:#65799a;
  --cyan:#22d3ee;
  --mint:#34d399;
  --amber:#f59e0b;
  --rose:#f472b6;
  --violet:#a78bfa;
  --ok:#34d399;
  --bad:#fb7185;
  --r:16px;
  --shadow:0 18px 48px rgba(0,0,0,.45);
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(34,211,238,.12), transparent 62%),
    radial-gradient(900px 560px at 92% 4%, rgba(167,139,250,.11), transparent 60%),
    radial-gradient(800px 700px at 50% 108%, rgba(52,211,153,.07), transparent 62%),
    var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:15px;
  line-height:1.65;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;font-size:inherit;color:inherit;cursor:pointer;border:none;background:none}
input{font-family:inherit;font-size:inherit}
a{color:var(--cyan);text-decoration:none}

/* ---------- 布局 ---------- */
.shell{max-width:760px;margin:0 auto;padding:0 16px 96px}

/* ---------- 双栏骨架：左树 + 右内容 ---------- */
.app{display:flex;min-height:100vh;align-items:stretch}

.sidebar{
  width:286px;flex:0 0 286px;
  background:linear-gradient(180deg,rgba(15,22,38,.96),rgba(10,14,23,.98));
  border-right:1px solid var(--line);
  display:flex;flex-direction:column;
  position:sticky;top:0;height:100vh;z-index:60;
}
.sb-brand{
  display:flex;align-items:center;gap:10px;
  padding:16px 16px 12px;border-bottom:1px solid var(--line);
}
.sb-brand .lg{font-size:17px;font-weight:800;letter-spacing:-.3px;flex:1}
.sb-brand .lg em{font-style:normal;color:var(--cyan)}
.sb-close{display:none;font-size:15px;color:var(--txt-3);padding:4px 6px}

.track-row{
  display:grid;grid-template-columns:repeat(6,1fr);gap:5px;
  padding:12px 12px 8px;
}
.trk{
  display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:7px 2px;border-radius:9px;
  background:rgba(255,255,255,.03);border:1px solid transparent;
  font-size:9.5px;color:var(--txt-3);line-height:1.25;
  transition:background .16s,border-color .16s,color .16s;
}
.trk b{font-size:12.5px;font-weight:800;color:var(--txt-2)}
.trk:hover{background:rgba(255,255,255,.06)}
.trk.on{
  background:color-mix(in srgb,var(--accent) 16%,transparent);
  border-color:color-mix(in srgb,var(--accent) 42%,transparent);
  color:var(--accent);
}
.trk.on b{color:var(--accent)}

.sb-book{
  padding:2px 14px 8px;font-size:10.5px;color:var(--txt-3);
  letter-spacing:.3px;
}

.sb-search{padding:0 12px 10px}
.sb-input{
  width:100%;padding:8px 11px;border-radius:9px;
  background:rgba(8,13,22,.8);border:1px solid var(--line);
  color:var(--txt);font-size:12.5px;outline:none;
}
.sb-input::placeholder{color:var(--txt-3)}
.sb-input:focus{border-color:rgba(34,211,238,.5)}

.sb-tree{
  flex:1;overflow-y:auto;padding:0 8px 12px;
  scrollbar-width:thin;
}
.sb-tree::-webkit-scrollbar{width:7px}
.sb-tree::-webkit-scrollbar-thumb{background:rgba(126,152,196,.24);border-radius:6px}

.unit{margin-bottom:12px}
.unit-hd{
  display:flex;align-items:center;gap:6px;
  padding:7px 8px 5px;margin-left:2px;
  font-size:10.5px;font-weight:700;color:var(--txt-3);letter-spacing:.4px;
  border-left:2px solid rgba(34,211,238,.4);padding-left:8px;
}
.unit-hd .u-nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.unit-hd .u-prog{
  flex:0 0 auto;font-size:9.5px;font-weight:700;letter-spacing:0;
  color:var(--txt-3);background:rgba(255,255,255,.05);
  padding:1px 5px;border-radius:5px;font-variant-numeric:tabular-nums;
}
.tnode{
  display:flex;align-items:center;gap:7px;width:100%;
  padding:7px 9px;border-radius:8px;text-align:left;
  font-size:12.5px;color:var(--txt-2);
  transition:background .14s,color .14s;
}
.tnode:hover{background:rgba(255,255,255,.05);color:var(--txt)}
.tnode.on{background:rgba(34,211,238,.1);color:var(--cyan);font-weight:650}
.tnode .rd{
  flex:0 0 13px;width:13px;height:13px;border-radius:4px;
  border:1px solid var(--line-strong);display:grid;place-items:center;
  font-size:9px;line-height:1;color:#04131c;
}
.tnode .rd.done{background:var(--mint);border-color:var(--mint)}
.tnode .nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tnode .ring{flex:0 0 auto;display:block}
.tnode .ring-none{
  flex:0 0 auto;width:7px;height:7px;border-radius:50%;
  background:transparent;border:1px dashed rgba(126,152,196,.4);
  margin:0 4px;
}
/* 弱项节点用左侧细条提示 */
.tnode.st-weak{box-shadow:inset 2px 0 0 rgba(251,113,133,.55)}
.tnode.st-solid{box-shadow:inset 2px 0 0 rgba(52,211,153,.5)}
.sb-empty{padding:22px 12px;text-align:center;font-size:12px;color:var(--txt-3)}

.sb-legend{
  display:flex;gap:11px;padding:0 14px 6px;
  font-size:9.5px;color:var(--txt-3);letter-spacing:.2px;
}
.sb-legend span{display:inline-flex;align-items:center;gap:4px}
.sb-legend i{width:7px;height:7px;border-radius:50%;display:inline-block}
.sb-legend .lg-none{border:1px dashed rgba(126,152,196,.5)}
.sb-legend .lg-weak{background:var(--bad)}
.sb-legend .lg-sol{background:var(--mint)}

.sb-foot{padding:10px 12px 14px;border-top:1px solid var(--line)}

.sb-mask{
  display:none;position:fixed;inset:0;z-index:55;
  background:rgba(3,6,12,.6);backdrop-filter:blur(3px);
}

.main{flex:1;min-width:0;display:flex;flex-direction:column}
.wrap{max-width:860px;width:100%;margin:0 auto;padding:0 20px 96px}

/* ---------- 要点回忆 ---------- */
.ch-head{margin:22px 0 16px}
.ch-kicker{font-size:11.5px;color:var(--cyan);font-weight:700;letter-spacing:.5px}
.ch-head h2{margin:6px 0 9px;font-size:25px;line-height:1.3;font-weight:800;letter-spacing:-.5px}
.ch-meta{display:flex;flex-wrap:wrap;gap:6px}
.pill{font-size:11px;padding:3px 9px;border-radius:20px;background:rgba(148,163,184,.1);color:var(--txt-2);border:1px solid var(--line)}
.pill.b{background:rgba(34,211,238,.1);color:#7dd3fc;border-color:rgba(34,211,238,.24)}
.pill.g{background:rgba(52,211,153,.12);color:#6ee7b7;border-color:rgba(52,211,153,.28)}

.teach{
  background:linear-gradient(180deg,rgba(34,211,238,.055),rgba(20,28,44,.7));
  border:1px solid rgba(34,211,238,.22);
  border-radius:var(--r);
  box-shadow:var(--shadow);
  margin-bottom:22px;
  overflow:hidden;
}
.tc-hd{
  display:flex;align-items:center;gap:9px;
  padding:11px 16px;border-bottom:1px solid var(--line);
  background:rgba(10,16,27,.4);
}
.tc-tag{
  font-size:11px;font-weight:800;color:#04131c;
  background:linear-gradient(100deg,var(--cyan),#38bdf8);
  border-radius:5px;padding:2px 8px;letter-spacing:.4px;
}
.tc-tip{font-size:11.5px;color:var(--txt-3)}
.tc-row{
  display:flex;gap:11px;padding:12px 16px 0;
  font-size:13.6px;color:var(--txt-2);line-height:1.78;
}
.tc-row > i{
  flex:0 0 58px;font-style:normal;font-size:10.5px;font-weight:700;
  color:#7dd3fc;background:rgba(34,211,238,.1);
  border-radius:6px;height:21px;line-height:21px;text-align:center;
  margin-top:3px;letter-spacing:.2px;
}
.tc-row > div{flex:1;min-width:0}
.tc-st{counter-reset:tc;margin:10px 0 0;padding:0 16px;list-style:none}
.tc-st li{
  position:relative;padding:8px 0 8px 28px;
  font-size:13.6px;color:var(--txt-2);line-height:1.8;
  border-top:1px dashed rgba(126,152,196,.16);
}
.tc-st li:first-child{border-top:none}
.tc-st li::before{
  content:counter(tc);counter-increment:tc;position:absolute;left:0;top:10px;
  width:19px;height:19px;border-radius:50%;
  background:rgba(34,211,238,.14);color:#7dd3fc;
  font-size:11px;font-weight:800;display:grid;place-items:center;
}
.tc-mem{
  margin:12px 16px 0;padding:9px 13px;
  background:rgba(245,158,11,.1);border-left:3px solid var(--amber);
  border-radius:0 8px 8px 0;font-size:13.2px;color:#fcd34d;line-height:1.72;
}
.tc-mem b{color:var(--amber);margin-right:7px;font-size:11px;letter-spacing:.3px}
.tc-acts{display:flex;gap:8px;padding:14px 16px 15px}

/* ---------- 本考点练习 ---------- */
.sec-head{
  display:flex;align-items:baseline;gap:10px;
  margin:24px 0 12px;
}
.sec-head h3{margin:0;font-size:16px;font-weight:750;letter-spacing:-.2px}
.sec-head .hint{font-size:11.5px;color:var(--txt-3);margin-left:auto}

.q-stack{display:flex;flex-direction:column;gap:14px}
.q-card{
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:var(--r);
  padding:16px 17px;box-shadow:var(--shadow);
}
.q-hd{display:flex;align-items:center;gap:9px;margin-bottom:10px}
.q-no{
  width:22px;height:22px;border-radius:7px;display:grid;place-items:center;
  font-size:11.5px;font-weight:800;
  background:rgba(34,211,238,.12);color:#7dd3fc;
}
.q-diff{font-size:9.5px;color:var(--txt-3);letter-spacing:1px;margin-left:auto}
.inline-loading{
  display:flex;align-items:center;gap:8px;padding:12px 2px 2px;
  font-size:12.5px;color:var(--txt-3);
}
.reveal-slot:empty{display:none}
.reveal-slot{margin-top:14px}

/* ---------- 顶部栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;gap:12px;
  padding:12px 20px;
  background:rgba(10,14,23,.82);
  backdrop-filter:blur(18px) saturate(1.4);
  -webkit-backdrop-filter:blur(18px) saturate(1.4);
  border-bottom:1px solid var(--line);
}
.topbar .logo{font-size:16px;font-weight:800;letter-spacing:-.3px}
.topbar .logo em{font-style:normal;color:var(--cyan)}
.topbar .spacer{flex:1}
.burger{
  display:none;font-size:16px;padding:5px 8px;
  border-radius:8px;border:1px solid var(--line);color:var(--txt-2);
}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 11px;border-radius:999px;
  background:var(--panel);border:1px solid var(--line);
  font-size:12.5px;color:var(--txt-2);
  font-variant-numeric:tabular-nums;
}
.chip b{color:var(--txt);font-weight:600}
.uid-btn{font-variant-numeric:tabular-nums;letter-spacing:.4px}

/* ---------- 卡片 ---------- */
.card{
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:18px;
  box-shadow:var(--shadow);
}
.card + .card{margin-top:14px}

/* ---------- 首页 ---------- */
.hero{padding:26px 0 6px}
.hero h1{
  margin:0 0 8px;font-size:27px;line-height:1.28;font-weight:800;letter-spacing:-.6px;
}
.hero h1 .grad{
  background:linear-gradient(100deg,var(--cyan),var(--mint) 48%,var(--violet));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p{margin:0;color:var(--txt-2);font-size:14px;max-width:52ch}

.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0 6px}
.stat{
  background:var(--panel);border:1px solid var(--line);border-radius:13px;
  padding:12px 13px;
}
.stat .k{font-size:11.5px;color:var(--txt-3);letter-spacing:.4px}
.stat .v{font-size:21px;font-weight:800;font-variant-numeric:tabular-nums;margin-top:2px}
.stat .v small{font-size:12px;font-weight:600;color:var(--txt-2);margin-left:2px}

.sec-title{
  display:flex;align-items:center;gap:8px;
  margin:26px 0 12px;font-size:13px;font-weight:700;
  color:var(--txt-2);letter-spacing:.6px;text-transform:uppercase;
}
.sec-title::after{content:'';flex:1;height:1px;background:var(--line)}

/* ---------- 学科网格 ---------- */
.subject-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.subj{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:15px;
  padding:15px 13px 13px;text-align:left;
  transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.subj:active{transform:scale(.975)}
.subj::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(120% 90% at 50% -25%,var(--accent) 0%,transparent 66%);
  opacity:.15;transition:opacity .18s;
}
.subj:hover::before{opacity:.28}
.subj .ic{
  position:relative;width:34px;height:34px;border-radius:10px;
  display:grid;place-items:center;font-weight:800;font-size:16px;
  color:var(--accent);
  background:color-mix(in srgb,var(--accent) 16%,transparent);
  border:1px solid color-mix(in srgb,var(--accent) 34%,transparent);
}
.subj .nm{position:relative;font-size:15.5px;font-weight:700;margin-top:10px}
.subj .ct{position:relative;font-size:11.5px;color:var(--txt-3);margin-top:1px}
.subj .bar{
  position:relative;height:3px;border-radius:2px;margin-top:10px;
  background:rgba(255,255,255,.07);overflow:hidden;
}
.subj .bar i{display:block;height:100%;border-radius:2px;background:var(--accent);transition:width .5s ease}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:11px 18px;border-radius:11px;font-weight:650;font-size:14.5px;
  border:1px solid var(--line-strong);background:var(--panel-2);color:var(--txt);
  transition:transform .14s ease,background .16s ease,border-color .16s;
}
.btn:active{transform:scale(.97)}
.btn-primary{
  background:linear-gradient(100deg,var(--cyan),#38bdf8);
  color:#04131c;border-color:transparent;font-weight:750;
  box-shadow:0 8px 24px rgba(34,211,238,.26);
}
.btn-ghost{background:transparent}
.btn-block{width:100%}
.btn-sm{padding:8px 13px;font-size:13px;border-radius:9px}
.btn:disabled{opacity:.45;pointer-events:none}

/* ---------- 登录 ---------- */
.auth-wrap{
  min-height:100vh;display:grid;place-items:center;padding:24px 16px;
}
.auth-card{
  width:100%;max-width:400px;
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:20px;
  padding:28px 24px 24px;box-shadow:var(--shadow);
}
.auth-logo{font-size:26px;font-weight:800;letter-spacing:-.6px;text-align:center}
.auth-logo em{font-style:normal;color:var(--cyan)}
.auth-sub{text-align:center;color:var(--txt-3);font-size:12.5px;margin:6px 0 22px}
.field{margin-bottom:13px}
.field label{display:block;font-size:12px;color:var(--txt-2);margin-bottom:7px;font-weight:600}
.input-row{display:flex;gap:8px}
.input{
  width:100%;padding:12px 14px;border-radius:11px;
  background:rgba(8,13,22,.7);border:1px solid var(--line-strong);
  color:var(--txt);outline:none;transition:border-color .16s,box-shadow .16s;
}
.input::placeholder{color:var(--txt-3)}
.input:focus{border-color:rgba(34,211,238,.65);box-shadow:0 0 0 3px rgba(34,211,238,.12)}
.tab-row{display:flex;gap:6px;background:rgba(8,13,22,.6);padding:4px;border-radius:11px;margin-bottom:18px}
.tab-row button{
  flex:1;padding:8px;border-radius:8px;font-size:13.5px;font-weight:650;color:var(--txt-3);
  transition:background .16s,color .16s;
}
.tab-row button.on{background:var(--panel-2);color:var(--txt);box-shadow:0 2px 10px rgba(0,0,0,.3)}
.err{color:var(--bad);font-size:12.5px;min-height:18px;margin:6px 0 2px}
.hint{color:var(--txt-3);font-size:11.5px;margin-top:8px;line-height:1.5}
.dice{
  flex:0 0 auto;width:46px;border-radius:11px;
  background:var(--panel-2);border:1px solid var(--line-strong);
  display:grid;place-items:center;font-size:17px;
  transition:transform .3s ease;
}
.dice:active{transform:rotate(180deg) scale(.94)}

/* ---------- 答题 ---------- */
.quiz-head{
  display:flex;align-items:center;gap:12px;margin:16px 0 14px;
}
.progress{
  flex:1;height:5px;border-radius:3px;background:rgba(255,255,255,.08);overflow:hidden;
}
.progress i{display:block;height:100%;border-radius:3px;background:linear-gradient(90deg,var(--cyan),var(--mint));transition:width .34s ease}
.qcount{font-size:12.5px;color:var(--txt-2);font-variant-numeric:tabular-nums;white-space:nowrap}
.qcount b{color:var(--txt);font-size:15px}

.stem{
  font-size:16.5px;line-height:1.78;white-space:pre-wrap;
  margin:0 0 16px;font-weight:520;
}
.tag-row{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.tag{
  font-size:11px;padding:3px 9px;border-radius:999px;
  background:rgba(34,211,238,.1);color:#7dd3fc;border:1px solid rgba(34,211,238,.24);
}
.tag.dim{background:rgba(148,163,184,.1);color:var(--txt-2);border-color:var(--line)}

.opts{display:flex;flex-direction:column;gap:9px}
.opt{
  display:flex;gap:12px;align-items:flex-start;
  padding:13px 14px;border-radius:12px;text-align:left;
  background:rgba(10,16,27,.62);border:1px solid var(--line);
  transition:border-color .15s,background .15s,transform .12s;
  line-height:1.6;
}
.opt:active{transform:scale(.99)}
.opt .key{
  flex:0 0 auto;width:23px;height:23px;border-radius:7px;
  display:grid;place-items:center;font-size:12.5px;font-weight:750;
  background:rgba(255,255,255,.07);color:var(--txt-2);margin-top:1px;
  transition:background .15s,color .15s;
}
.opt .tx{flex:1;font-size:14.5px}
.opt.pick{border-color:rgba(34,211,238,.6);background:rgba(34,211,238,.07)}
.opt.pick .key{background:var(--cyan);color:#04131c}
.opt.right{border-color:rgba(52,211,153,.55);background:rgba(52,211,153,.08)}
.opt.right .key{background:var(--mint);color:#031a12}
.opt.wrong{border-color:rgba(251,113,133,.55);background:rgba(251,113,133,.07)}
.opt.wrong .key{background:var(--bad);color:#2a0510}
.opt[disabled]{cursor:default}
.opt .mark{margin-left:2px;font-size:13px;font-weight:700}

/* 解析 */
.reveal{margin-top:18px;animation:rise .3s ease both}
@keyframes rise{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:none}}

.verdict{
  display:flex;align-items:center;gap:9px;
  padding:11px 14px;border-radius:12px;font-weight:700;font-size:14.5px;
  margin-bottom:12px;
}
.verdict.ok{background:rgba(52,211,153,.11);color:#6ee7b7;border:1px solid rgba(52,211,153,.26)}
.verdict.no{background:rgba(251,113,133,.1);color:#fda4af;border:1px solid rgba(251,113,133,.26)}

.explain-item{
  padding:12px 13px;border-radius:11px;margin-bottom:8px;
  background:rgba(10,16,27,.55);border:1px solid var(--line);
  font-size:13.8px;line-height:1.7;color:var(--txt-2);
}
.explain-item .hd{
  display:flex;align-items:center;gap:7px;margin-bottom:5px;
  font-size:12.5px;font-weight:750;
}
.explain-item .hd .kk{
  width:19px;height:19px;border-radius:5px;display:grid;place-items:center;
  font-size:11px;background:rgba(255,255,255,.08);color:var(--txt-2);
}
.explain-item.is-right{border-color:rgba(52,211,153,.3);background:rgba(52,211,153,.05)}
.explain-item.is-right .hd{color:#6ee7b7}
.explain-item.is-right .hd .kk{background:rgba(52,211,153,.2);color:#6ee7b7}
.explain-item.is-wrong .hd{color:#fda4af}
.explain-item.is-wrong .hd .kk{background:rgba(251,113,133,.18);color:#fda4af}

.kp{
  margin-top:12px;padding:12px 14px;border-radius:12px;
  background:linear-gradient(100deg,rgba(34,211,238,.09),rgba(167,139,250,.08));
  border:1px solid rgba(34,211,238,.2);
  font-size:13.6px;line-height:1.7;
}
.kp .lb{font-size:11px;font-weight:750;letter-spacing:.6px;color:#7dd3fc;display:block;margin-bottom:4px}
.kp p{margin:0;color:var(--txt)}
.kp .mt{margin-top:8px;padding-top:8px;border-top:1px dashed rgba(126,152,196,.2);color:var(--txt-2);font-size:13px}

.ai-box{
  margin-top:12px;padding:13px 14px;border-radius:12px;
  background:rgba(167,139,250,.06);border:1px solid rgba(167,139,250,.22);
  font-size:13.6px;line-height:1.75;color:var(--txt-2);white-space:pre-wrap;
}
.ai-box .lb{font-size:11px;font-weight:750;letter-spacing:.6px;color:#c4b5fd;display:block;margin-bottom:6px}
.ai-loading{display:inline-flex;gap:4px;align-items:center;color:var(--txt-3);font-size:13px}
.ai-loading i{
  width:5px;height:5px;border-radius:50%;background:var(--violet);
  animation:bounce 1s infinite;
}
.ai-loading i:nth-child(2){animation-delay:.15s}
.ai-loading i:nth-child(3){animation-delay:.3s}
@keyframes bounce{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}

.foot-actions{display:flex;gap:9px;margin-top:18px}
.foot-actions .btn{flex:1}

/* ---------- 雷达图 ---------- */
.radar-wrap{display:grid;place-items:center;padding:6px 0 2px}
.radar-wrap svg{width:100%;max-width:340px;height:auto;overflow:visible}
.radar-legend{
  display:flex;flex-wrap:wrap;gap:8px 14px;justify-content:center;
  margin-top:12px;font-size:12px;color:var(--txt-2);
}
.radar-legend span{display:inline-flex;align-items:center;gap:5px}
.radar-legend i{width:8px;height:8px;border-radius:2px;display:inline-block}

.score-big{
  text-align:center;padding:8px 0 4px;
}
.score-big .n{font-size:44px;font-weight:800;line-height:1;font-variant-numeric:tabular-nums}
.score-big .n small{font-size:16px;font-weight:600;color:var(--txt-3)}
.score-big .l{color:var(--txt-3);font-size:12.5px;margin-top:6px}

.axis-list{display:flex;flex-direction:column;gap:8px;margin-top:14px}
.axis-item{
  display:flex;align-items:center;gap:10px;font-size:13.2px;
  padding:9px 12px;border-radius:10px;
  background:rgba(10,16,27,.5);border:1px solid var(--line);
}
.axis-item .nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.axis-item .mini{width:64px;height:4px;border-radius:2px;background:rgba(255,255,255,.08);overflow:hidden;flex:0 0 auto}
.axis-item .mini i{display:block;height:100%;border-radius:2px}
.axis-item .pc{width:44px;text-align:right;font-variant-numeric:tabular-nums;font-weight:650;flex:0 0 auto}

/* ---------- 错题本 ---------- */
.wrong-item{
  padding:13px 14px;border-radius:12px;margin-bottom:9px;
  background:rgba(10,16,27,.55);border:1px solid var(--line);
}
.wrong-item .hd{display:flex;align-items:center;gap:8px;margin-bottom:7px;font-size:11.5px;color:var(--txt-3)}
.wrong-item .hd .subj-tag{padding:2px 7px;border-radius:5px;background:rgba(34,211,238,.1);color:#7dd3fc}
.wrong-item .st{font-size:14px;line-height:1.7;color:var(--txt);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.wrong-item .ft{display:flex;align-items:center;gap:8px;margin-top:9px}
.wrong-item .ans{font-size:12.5px;color:var(--mint);font-weight:650}
.wrong-item .sp{flex:1}

/* ---------- 空态 ---------- */
.empty{
  text-align:center;padding:52px 20px;color:var(--txt-3);
}
.empty .ic{font-size:34px;opacity:.5;margin-bottom:10px}
.empty p{margin:0;font-size:13.5px}

/* ---------- 底部导航 ---------- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:50;
  display:flex;
  background:rgba(10,14,23,.9);
  backdrop-filter:blur(20px) saturate(1.4);
  -webkit-backdrop-filter:blur(20px) saturate(1.4);
  border-top:1px solid var(--line);
  padding:6px 0 max(6px,env(safe-area-inset-bottom));
}
.tabbar button{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:6px 0;font-size:10.5px;color:var(--txt-3);font-weight:600;
  transition:color .15s;
}
.tabbar button .i{font-size:18px;line-height:1;filter:grayscale(1) opacity(.55);transition:filter .15s}
.tabbar button.on{color:var(--cyan)}
.tabbar button.on .i{filter:none}

/* ---------- 模态 ---------- */
.modal-mask{
  position:fixed;inset:0;z-index:100;display:grid;place-items:center;
  background:rgba(3,6,12,.72);backdrop-filter:blur(6px);
  padding:24px 18px;animation:fade .18s ease;
}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal{
  width:100%;max-width:360px;
  background:linear-gradient(180deg,#182132,#111a2a);
  border:1px solid var(--line-strong);border-radius:18px;
  padding:22px;box-shadow:0 24px 64px rgba(0,0,0,.6);
  animation:pop .2s ease;
}
@keyframes pop{from{opacity:0;transform:scale(.94)}to{opacity:1;transform:none}}
.modal h3{margin:0 0 8px;font-size:17px;font-weight:750}
.modal p{margin:0 0 18px;color:var(--txt-2);font-size:13.5px;line-height:1.7}
.modal .acts{display:flex;gap:9px}
.modal .acts .btn{flex:1}

/* ---------- 提示 ---------- */
.toast{
  position:fixed;left:50%;bottom:88px;transform:translateX(-50%);
  z-index:200;padding:10px 18px;border-radius:11px;
  background:rgba(24,33,50,.96);border:1px solid var(--line-strong);
  font-size:13.5px;color:var(--txt);box-shadow:0 12px 32px rgba(0,0,0,.5);
  animation:toastIn .22s ease;
  max-width:min(360px,86vw);text-align:center;
}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}

/* ---------- 加载 ---------- */
.skel{background:linear-gradient(90deg,rgba(255,255,255,.04),rgba(255,255,255,.09),rgba(255,255,255,.04));background-size:200% 100%;animation:shimmer 1.4s infinite;border-radius:8px}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

.spin{
  width:18px;height:18px;border-radius:50%;
  border:2px solid rgba(255,255,255,.15);border-top-color:var(--cyan);
  animation:spin .7s linear infinite;display:inline-block;
}
@keyframes spin{to{transform:rotate(360deg)}}

@media (max-width:380px){
  .hero h1{font-size:23px}
  .subject-grid{grid-template-columns:repeat(2,1fr)}
  .stat-row{grid-template-columns:repeat(2,1fr)}
}

/* ---------- 移动端：侧栏抽屉化 ---------- */
@media (max-width:900px){
  .burger{display:inline-flex;align-items:center}
  .sidebar{
    position:fixed;left:0;top:0;height:100vh;width:284px;
    transform:translateX(-102%);
    transition:transform .24s cubic-bezier(.4,0,.2,1);
    box-shadow:0 0 48px rgba(0,0,0,.6);
  }
  .sidebar.open{transform:translateX(0)}
  .sb-close{display:block}
  .sb-mask.on{display:block}
  .wrap{padding:0 15px 96px}
  .topbar{padding:11px 15px}
  .ch-head{margin:16px 0 14px}
  .ch-head h2{font-size:22px}
  .tc-row{flex-direction:column;gap:3px;padding:11px 14px 0}
  .tc-row > i{flex:none;width:fit-content;padding:0 8px}
  .tc-st{padding:0 14px}
  .tc-mem{margin:11px 14px 0}
  .tc-acts{padding:13px 14px 14px;flex-direction:column}
  .tc-acts .btn{width:100%}
  .q-card{padding:14px 14px}
  .sec-head{flex-wrap:wrap;gap:4px}
  .sec-head .hint{margin-left:0;flex-basis:100%}
}

@media (max-width:400px){
  .track-row{grid-template-columns:repeat(3,1fr);gap:6px}
}