:root{
  --bg:#f7f6f3; --panel:#fffefb; --ink:#1c1b19; --ink2:#57534e; --ink3:#8a857e;
  --line:#e5e1d8; --line2:#efece5;
  --brand:#2f5d50; --brand-soft:#e8f0ed;
  --accent:#b45309; --accent-soft:#fdf2e3;
  --ok:#2f7d5d; --ok-soft:#e7f3ec;
  --bad:#b03a2e; --bad-soft:#fbeae7;
  --law:#7c3aed; --num:#0e7490; --key:#b45309;
  --radius:14px; --shadow:0 1px 2px rgba(28,27,25,.05),0 6px 18px -12px rgba(28,27,25,.25);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px; line-height:1.7; -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
button{font-family:inherit;font-size:inherit;cursor:pointer;border:0;background:none;color:inherit}

/* 顶栏 */
.topbar{
  position:sticky;top:0;z-index:40;background:rgba(247,246,243,.92);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.topbar-in{max-width:1080px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:14px}
.brand{font-weight:700;font-size:16px;letter-spacing:.02em;display:flex;align-items:center;gap:8px;white-space:nowrap}
.brand .dot{width:8px;height:8px;border-radius:50%;background:var(--brand);flex:0 0 auto}
.brand .bs{display:none}
.nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.nav a{padding:6px 12px;border-radius:9px;color:var(--ink2);font-size:14.5px}
.nav a:hover{background:var(--line2)}
.nav a.on{background:var(--brand);color:#fff}
.wrap{max-width:1080px;margin:0 auto;padding:26px 20px 96px}
.narrow{max-width:820px}

/* 通用 */
h1{font-size:26px;line-height:1.35;margin:0 0 6px;letter-spacing:-.01em}
h2{font-size:19px;margin:0 0 12px}
.sub{color:var(--ink2);font-size:14.5px}
.muted{color:var(--ink3);font-size:13.5px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.grid{display:grid;gap:14px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
@media(max-width:760px){.g3,.g2{grid-template-columns:1fr}}
.row{display:flex;align-items:center;gap:10px}
.spacer{flex:1}
.tag{display:inline-block;padding:1px 8px;border-radius:6px;font-size:12.5px;background:var(--line2);color:var(--ink2)}
.tag.ok{background:var(--ok-soft);color:var(--ok)}
.tag.bad{background:var(--bad-soft);color:var(--bad)}
.tag.warn{background:var(--accent-soft);color:var(--accent)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;border-radius:10px;background:var(--brand);color:#fff;font-weight:600;font-size:15px}
.btn:hover{filter:brightness(1.06)}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--ink)}
.btn.ghost:hover{background:var(--line2)}
.btn[disabled]{opacity:.42;cursor:not-allowed}
.empty{padding:40px 20px;text-align:center;color:var(--ink3)}

/* 首页 */
.hero{padding:16px 0 22px}
.hero h1{font-size:31px}
.hero p{color:var(--ink2);margin:8px 0 0;font-size:15.5px}
.entry{display:block;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s}
.entry:hover{transform:translateY(-2px);box-shadow:0 10px 28px -16px rgba(28,27,25,.35)}
.entry .ic{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-size:19px;background:var(--brand-soft);color:var(--brand);margin-bottom:12px}
.entry h3{margin:0 0 4px;font-size:17px}
.entry p{margin:0;color:var(--ink3);font-size:13.5px}
.stats{display:flex;gap:26px;flex-wrap:wrap;margin-top:6px}
.stat b{font-size:22px;display:block;line-height:1.2}
.stat span{font-size:12.5px;color:var(--ink3)}

/* 列表 */
.list{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.li{display:flex;align-items:center;gap:14px;padding:14px 18px;border-bottom:1px solid var(--line2)}
.li:last-child{border-bottom:0}
.li:hover{background:#faf9f5}
.li .n{width:34px;height:34px;border-radius:9px;background:var(--line2);display:grid;place-items:center;font-size:13px;color:var(--ink2);flex:0 0 auto;font-weight:600}
.li .t{min-width:0}
.li .t b{display:block;font-weight:600;font-size:15.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.li .t small{color:var(--ink3);font-size:12.5px}

/* 阅读器 */
.reader{display:grid;grid-template-columns:250px minmax(0,1fr);gap:30px;align-items:start}
@media(max-width:900px){.reader{grid-template-columns:1fr;gap:14px}}
.toc{position:sticky;top:66px;max-height:calc(100vh - 90px);overflow:auto;border-right:1px solid var(--line);padding-right:14px}
.toc h4{margin:0 0 8px;font-size:12.5px;letter-spacing:.08em;color:var(--ink3);text-transform:uppercase}
.toc a{display:block;padding:5px 9px;border-radius:7px;color:var(--ink2);font-size:14px;line-height:1.45;border-left:2px solid transparent}
.toc a:hover{background:var(--line2);color:var(--ink)}
.toc a.l2{font-weight:600;color:var(--ink);margin-top:6px}
.toc a.l3{padding-left:20px;font-size:13.5px}
.toc a.on{background:var(--accent-soft);color:var(--accent);border-left-color:var(--accent)}
@media(max-width:900px){
  .toc{position:static;max-height:none;border-right:0;border-bottom:1px solid var(--line);padding:0 0 10px;margin-bottom:8px}
  .toc.collapsed{display:none}
}
.reader-body{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px 34px 40px;box-shadow:var(--shadow);min-height:60vh}
@media(max-width:760px){.reader-body{padding:20px 18px 32px;font-size:16px}}
.reader-body h1{font-size:24px;margin-bottom:4px}
.bk{font-size:13px;color:var(--ink3);margin-bottom:18px}
.blk{margin:0 0 14px;text-align:justify;line-height:1.95;color:#26241f}
.blk.h2{font-size:19px;font-weight:700;margin:34px 0 14px;padding-top:14px;border-top:1px solid var(--line2);line-height:1.5}
.blk.h3{font-size:16.5px;font-weight:700;margin:24px 0 10px;color:#1f1d19}
.blk.h4{font-size:15.5px;font-weight:600;margin:16px 0 8px;color:var(--ink2)}
.blk.flash{background:#fff6e0;box-shadow:0 0 0 8px #fff6e0;border-radius:4px;transition:background .8s}
mark.law{background:rgba(124,58,237,.12);color:#5b21b6;border-radius:3px;padding:0 2px}
mark.num{background:rgba(14,116,144,.11);color:#0e7490;border-radius:3px;padding:0 2px}
mark.key{background:rgba(180,83,9,.13);color:#9a3412;border-radius:3px;padding:0 2px}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12.5px;color:var(--ink3);margin:10px 0 20px}
.legend i{font-style:normal;padding:1px 6px;border-radius:4px}

/* 做题 */
.exam-head{display:flex;align-items:center;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.progress{height:5px;background:var(--line2);border-radius:99px;overflow:hidden;flex:1;min-width:120px}
.progress i{display:block;height:100%;background:var(--brand);transition:width .2s}
.q-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:26px 28px;box-shadow:var(--shadow)}
@media(max-width:760px){.q-card{padding:20px 16px}}
.q-meta{display:flex;align-items:center;gap:8px;margin-bottom:14px;font-size:13px;color:var(--ink3)}
.q-stem{font-size:17.5px;line-height:1.85;margin:0 0 20px;font-weight:500;text-align:justify}
@media(max-width:760px){.q-stem{font-size:16.5px}}
.opt{display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;padding:13px 16px;border:1.5px solid var(--line);border-radius:12px;margin-bottom:10px;background:var(--panel);transition:.12s;min-height:48px}
.opt:hover{border-color:#cfc9bd;background:#fbfaf7}
.opt .k{flex:0 0 26px;height:26px;border-radius:8px;background:var(--line2);display:grid;place-items:center;font-weight:700;font-size:13.5px;color:var(--ink2)}
.opt .v{flex:1;line-height:1.6}
.opt.sel{border-color:var(--brand);background:var(--brand-soft)}
.opt.sel .k{background:var(--brand);color:#fff}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}
.opt.right .k{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt.wrong .k{background:var(--bad);color:#fff}
.opt[disabled]{cursor:default}

.explain{margin-top:18px;border-top:1px dashed var(--line);padding-top:16px;animation:fade .2s}
@keyframes fade{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.ans-line{display:flex;align-items:center;gap:10px;margin-bottom:10px;flex-wrap:wrap}
.ans-badge{background:var(--ok-soft);color:var(--ok);font-weight:700;padding:3px 12px;border-radius:7px;font-size:14px}
.ans-badge.none{background:var(--accent-soft);color:var(--accent)}
.ex-text{color:#332f28;line-height:1.9;white-space:pre-wrap}
.ex-src{font-size:12.5px;color:var(--ink3);margin-top:8px}
.src-tag{font-size:12px;padding:2px 8px;border-radius:6px;background:var(--line2);color:var(--ink3)}
.src-tag.src-book{background:#eef2f6;color:#3f5a72}
.src-tag.src-gen{background:var(--ok-soft);color:var(--ok);border:1px solid #cfe6d9}
.ex-note{font-size:12px;color:var(--ink3);margin-top:8px;padding-top:8px;border-top:1px dashed var(--line2)}
.ref-box{margin-top:14px;background:#f6f4ee;border:1px solid var(--line);border-radius:11px;padding:12px 14px;display:flex;align-items:center;gap:12px}
.ref-box .lbl{font-size:12.5px;color:var(--ink3);flex:0 0 auto}
.ref-box .tt{flex:1;min-width:0;font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.actions{display:flex;align-items:center;gap:10px;margin-top:22px}
.actions .mid{margin:0 auto}
@media(max-width:760px){
  .actions{
    position:fixed;left:0;right:0;bottom:calc(54px + env(safe-area-inset-bottom));margin:0;
    padding:10px 14px;
    background:rgba(247,246,243,.96);backdrop-filter:blur(10px);border-top:1px solid var(--line);z-index:30;gap:8px;
  }
  .actions .btn{padding:10px 14px;font-size:14.5px}
  .wrap{padding-bottom:150px}
}
.jump{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:7px;margin-top:12px}
.jump button{padding:7px 0;border-radius:8px;border:1px solid var(--line);font-size:13px;background:var(--panel)}
.jump button.done{background:var(--brand-soft);border-color:#cfe0d9;color:var(--brand)}
.jump button.cur{background:var(--brand);color:#fff;border-color:var(--brand)}
.jump button.bad{background:var(--bad-soft);border-color:#f0cdc6;color:var(--bad)}

/* 搜索 */
.searchbox{display:flex;gap:10px;margin-bottom:18px}
.searchbox input{flex:1;padding:12px 16px;border-radius:11px;border:1px solid var(--line);background:var(--panel);font-size:15.5px;outline:none}
.searchbox input:focus{border-color:var(--brand)}
.tabs{display:flex;gap:6px;margin-bottom:16px}
.tabs button{padding:7px 14px;border-radius:9px;color:var(--ink2);font-size:14px}
.tabs button.on{background:var(--brand);color:#fff}
.hit{padding:12px 0;border-bottom:1px solid var(--line2)}
.hit b{display:block;margin-bottom:2px}
.hit .snip{color:var(--ink2);font-size:14px;line-height:1.7}
.hit .snip em{background:#ffe9a8;font-style:normal;border-radius:3px;padding:0 2px}

/* 提示 */
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);background:#26241f;color:#fff;padding:10px 18px;border-radius:11px;font-size:14px;z-index:99;box-shadow:0 8px 30px rgba(0,0,0,.25)}
.banner{background:var(--accent-soft);border:1px solid #f3ddb9;color:#7c4a10;padding:11px 15px;border-radius:11px;font-size:13.5px;margin-bottom:16px;line-height:1.65}
.loading{padding:60px 0;text-align:center;color:var(--ink3);font-size:14px}

/* 进度 */
.bar{height:5px;background:var(--line2);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,#3f7d68,#2f5d50);border-radius:99px;transition:width .3s}
.resume-card{display:flex;align-items:center;gap:18px;background:linear-gradient(135deg,#fffdf7,#f6f3ea);border:1px solid #e7dfcd;border-radius:16px;padding:18px 20px;margin-bottom:20px;box-shadow:var(--shadow)}
.resume-card .rc-l{flex:1;min-width:0}
.rc-k{font-size:12.5px;color:var(--accent);font-weight:600;letter-spacing:.04em}
.rc-t{font-size:17px;font-weight:700;margin:2px 0 4px}
.rc-m{font-size:13px;color:var(--ink2);margin-bottom:10px}
.resume-card .btn{flex:0 0 auto}
@media(max-width:620px){
  .resume-card{flex-direction:column;align-items:stretch;gap:12px}
  .resume-card .btn{width:100%}
}
.plist{margin-top:12px}
.prow{display:flex;align-items:center;gap:14px;padding:11px 4px;border-bottom:1px solid var(--line2)}
.prow:last-child{border-bottom:0}
.prow:hover{background:#faf9f5}
.pr-main{flex:1;min-width:0}
.pr-t{font-size:14.5px;font-weight:600;margin-bottom:6px}
.pr-num{width:74px;text-align:right;font-size:13.5px;color:var(--ink2);font-variant-numeric:tabular-nums}
.pr-acc{width:52px;text-align:right;font-size:13.5px;color:var(--ink2);font-variant-numeric:tabular-nums}
.pr-time{width:118px;text-align:right;font-size:12.5px;color:var(--ink3);white-space:nowrap}
@media(max-width:620px){
  .prow{gap:8px}
  .pr-num{width:56px;font-size:12.5px}
  .pr-acc{width:42px;font-size:12.5px}
  .pr-time{display:none}
}
.resume-tip{background:var(--accent-soft);border:1px solid #f3ddb9;color:#7c4a10;padding:9px 14px;border-radius:10px;font-size:13.5px;margin-bottom:14px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.linkbtn{background:none;border:0;color:var(--accent);text-decoration:underline;font-size:13.5px;padding:0;margin-left:auto;cursor:pointer}


/* 手机 */
@media(max-width:760px){
  .topbar-in{padding:8px 12px;gap:8px}
  .brand .bt{display:none}
  .brand .bs{display:inline;font-size:15px}
  .nav{flex-wrap:nowrap;overflow-x:auto;gap:2px;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .nav::-webkit-scrollbar{display:none}
  .nav a{white-space:nowrap;padding:6px 10px;font-size:14px}
  .wrap{padding:18px 14px 150px}
  .hero h1{font-size:24px}
  h1{font-size:22px}
  .stats{gap:18px}
  .stat b{font-size:19px}
  .q-stem{font-size:16.5px}
  .opt{padding:12px 13px}
  .li{padding:12px 14px;gap:10px}
  .reader-body h1{font-size:21px}
}


/* 计时 */
.timer{font-variant-numeric:tabular-nums;font-size:13px;color:var(--ink2);letter-spacing:.02em;
  background:#f7f6f1;border:1px solid var(--line2);border-radius:7px;padding:3px 8px}
.timer-btn{background:#f2f0e8;color:var(--ink2)}
.timer-btn.on{background:#e8f2ec;color:#2f6a55;border:1px solid #cfe3d8}

/* 阅读器返回悬浮按钮 */
.back-fab{position:fixed;right:22px;bottom:24px;z-index:60;background:var(--brand);color:#fff;
  padding:11px 18px;border-radius:999px;font-size:14px;font-weight:600;
  box-shadow:0 6px 20px rgba(0,0,0,.18);text-decoration:none;transition:transform .15s}
.back-fab:hover{transform:translateY(-2px)}
@media(max-width:760px){.back-fab{right:14px;bottom:16px;padding:10px 15px;font-size:13.5px}}

/* 上一题回顾 */
.prev-ok{display:flex;align-items:center;gap:8px;font-size:13.5px;color:#2f6a55;
  background:#eef6f1;border:1px solid #d5e8dc;border-radius:10px;padding:8px 14px;margin-bottom:12px}
.prev-bad{display:flex;align-items:center;gap:8px;font-size:13.5px;color:#a33a2c;
  background:#fdf0ee;border:1px solid #f3d3cc;border-radius:10px;padding:8px 14px;margin-bottom:12px}
.prev-review{margin-top:16px;background:#fffdf8;border:1px solid #efe6d4;border-left:4px solid var(--accent);
  border-radius:12px;overflow:hidden}
.pr-head{display:flex;align-items:center;gap:12px;padding:11px 16px;cursor:pointer;
  background:#faf6ec;border-bottom:1px solid #efe6d4;user-select:none}
.pr-title{font-weight:600;font-size:14px;color:#7a4b12}
.pr-toggle{font-size:12.5px;color:var(--accent)}
.pr-body{padding:14px 16px}
.prev-review.collapsed .pr-body{display:none}
.pr-stem{font-size:15px;line-height:1.85;color:var(--ink);margin:0 0 10px}
.prev-review .explain{margin-top:0;border-top:0;padding-top:0}

/* ---- 划线 / 笔记 ---- */
mark.hl{border-radius:2px;padding:1px 0;background:transparent;cursor:pointer}
mark.hl.yellow{background:#fff3b0;box-shadow:inset 0 -2px 0 #ecc94b}
mark.hl.green{background:#d6f2e2;box-shadow:inset 0 -2px 0 #4fae7f}
mark.hl.blue{background:#dbeafe;box-shadow:inset 0 -2px 0 #5b8def}
mark.hl .hl-dot{display:inline-block;width:0;height:0;vertical-align:super}
mark.hl .hl-dot::after{content:'✎';font-size:10px;color:#b45309;margin-left:1px}

.selbar{position:fixed;z-index:80;display:flex;align-items:center;gap:7px;
  background:#2f2c27;color:#fff;padding:7px 10px;border-radius:11px;
  box-shadow:0 8px 26px rgba(0,0,0,.28);font-size:13px;white-space:nowrap}
.selbar[hidden]{display:none}
.selbar .sb-t{color:#b9b3a8;font-size:12px}
.selbar .sw{width:18px;height:18px;border-radius:50%;border:2px solid rgba(255,255,255,.55);cursor:pointer;padding:0}
.sw.yellow{background:#f6d860}.sw.green{background:#5ec48d}.sw.blue{background:#7aa7f0}
.selbar button[data-a]{background:none;border:0;color:#fff;font-size:13px;cursor:pointer;padding:2px 5px}
.selbar button[data-a]:hover{color:#ffd479}
.selbar button.danger{color:#ff9a8b}
.selbar .sb-sep{width:1px;height:16px;background:rgba(255,255,255,.25)}

.note-edit{position:fixed;z-index:81;width:320px;max-width:calc(100vw - 20px);background:#fff;
  border:1px solid var(--line2);border-radius:12px;box-shadow:0 12px 34px rgba(0,0,0,.18);padding:10px}
.note-edit textarea{width:100%;height:88px;border:1px solid var(--line2);border-radius:8px;padding:8px;
  font-size:14px;line-height:1.7;resize:vertical;font-family:inherit;box-sizing:border-box}
.ne-bar{display:flex;justify-content:flex-end;gap:8px;margin-top:8px}

.note-group{margin-top:16px;border:1px solid var(--line2);border-radius:12px;overflow:hidden;background:#fff}
.ng-head{display:flex;gap:10px;align-items:baseline;padding:10px 14px;background:#faf9f5;
  border-bottom:1px solid var(--line2);font-size:14px;flex-wrap:wrap}
.note-item{display:block;padding:11px 14px;border-bottom:1px solid var(--line2);text-decoration:none;color:inherit}
.note-item:last-child{border-bottom:0}
.note-item:hover{background:#fcfbf7}
.ni-text{font-size:14.5px;line-height:1.8;padding-left:10px;border-left:3px solid #ecc94b;color:var(--ink)}
.ni-text.hl-green{border-color:#4fae7f}
.ni-text.hl-blue{border-color:#5b8def}
.ni-note{font-size:13px;color:var(--ink2);margin-top:7px;padding:8px 10px;background:#f7f6f1;
  border-radius:8px;white-space:pre-wrap;line-height:1.7}

/* ---- 练习总结 ---- */
.tag.finish{background:#f3eee4;color:#8a5a1a}
.res-hero{display:flex;align-items:stretch;gap:0;border:1px solid var(--line2);border-radius:16px;
  overflow:hidden;background:#fff;box-shadow:var(--shadow);margin-top:14px}
.rh-main{flex:0 0 190px;display:flex;flex-direction:column;justify-content:center;align-items:center;
  padding:20px 10px;background:linear-gradient(135deg,#f7f5ee,#efece0)}
.rh-main b{font-size:38px;line-height:1;color:var(--brand);font-variant-numeric:tabular-nums}
.rh-main b small{font-size:16px;margin-left:2px}
.rh-main span{font-size:12.5px;color:var(--ink3);margin-top:8px}
.rh-item{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;
  padding:20px 8px;border-left:1px solid var(--line2)}
.rh-item b{font-size:22px;line-height:1;font-variant-numeric:tabular-nums}
.rh-item b small{font-size:12px;color:var(--ink3);font-weight:400}
.rh-item span{font-size:12.5px;color:var(--ink3);margin-top:7px}
.rh-item.ok b{color:#2f7d5c}.rh-item.bad b{color:#b3423a}
@media(max-width:640px){.res-hero{flex-wrap:wrap}.rh-main{flex:0 0 100%;border-bottom:1px solid var(--line2)}
  .rh-item{flex:1 1 33%;border-left:0;border-top:1px solid var(--line2)}}

.sheet{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:7px;margin-top:12px}
.sc{display:flex;align-items:center;justify-content:center;height:34px;border-radius:8px;
  font-size:12.5px;text-decoration:none;border:1px solid var(--line2);color:var(--ink2);background:#fbfaf7}
.sc.ok{background:#e7f4ec;border-color:#c4e3d2;color:#24614a;font-weight:600}
.sc.bad{background:#fbeae8;border-color:#f0cdc7;color:#9c3b31;font-weight:600}
.sc.sel{background:#eef2fb;border-color:#d3ddf3;color:#37548f}
.sheet-legend{display:flex;gap:16px;margin-top:12px;font-size:12.5px;color:var(--ink3);flex-wrap:wrap}
.sheet-legend i{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:5px;
  vertical-align:-1px;border:1px solid var(--line2);background:#fbfaf7}
.sheet-legend i.ok{background:#e7f4ec;border-color:#c4e3d2}
.sheet-legend i.bad{background:#fbeae8;border-color:#f0cdc7}
.sheet-legend i.sel{background:#eef2fb;border-color:#d3ddf3}

.rq{padding:14px 0;border-bottom:1px solid var(--line2)}
.rq:last-child{border-bottom:0}
.rq-h{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:7px}
.rq-n{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:22px;
  padding:0 6px;border-radius:6px;background:#f0eee7;font-size:12px;color:var(--ink2)}
.rq-chip{font-weight:700}
.rq-chip.ok{color:#2f7d5c}.rq-chip.bad{color:#b3423a}
.rq-ans{font-size:12.5px;color:var(--ink3);margin-left:auto}
.rq-ans b{color:var(--ink2)}
.rq-s{font-size:15px;line-height:1.85;margin:4px 0 8px}
.rq-e{font-size:14px;line-height:1.85;color:var(--ink2);background:#faf9f5;border-left:3px solid var(--line2);
  padding:9px 12px;border-radius:0 8px 8px 0}
.rq.bad .rq-e{border-left-color:#e3b4ab;background:#fdf7f6}
.rq-ref{display:inline-block;margin-top:7px;font-size:12.5px;color:var(--accent)}
.sum{cursor:pointer;font-size:17px;font-weight:700;padding:2px 0}
details.card>summary{list-style:none}
details.card>summary::-webkit-details-marker{display:none}
details.card>summary::before{content:'▸ ';color:var(--ink3)}
details.card[open]>summary::before{content:'▾ '}
.tag.res-link{background:#eef2fb;color:#37548f;cursor:pointer}
.tag.res-link:hover{background:#e2e9f8}

/* ---- 三色讲义 ---- */
.jc-r{color:#c0392b;font-weight:600}
.jc-b{color:#1f5fa8;font-weight:600}
.jy-legend{display:flex;gap:18px;flex-wrap:wrap;font-size:12.5px;color:var(--ink3);margin:10px 0 0}
.jy-legend b{font-weight:600}

/* 四色笔记：绿色标注 */
.jc-g{color:#1f7a3a;font-weight:600}

/* ================= 移动端适配 ================= */
.mbar,.tabbar,.more-sheet,.toc-backdrop{display:none}

@media(max-width:900px){
  /* 顶栏不再吸顶，避免与正文里的吸顶目录条叠加 */
  .topbar{position:static}
  /* 阅读器：目录改为抽屉 */
  .reader{display:block}
  .toc{
    position:fixed;left:0;top:0;bottom:0;width:min(84vw,330px);z-index:75;
    background:var(--panel);border-right:1px solid var(--line);border-bottom:0;
    margin:0;padding:16px 14px calc(20px + env(safe-area-inset-bottom));
    max-height:none;overflow:auto;box-shadow:8px 0 30px -22px rgba(0,0,0,.5);
    transform:translateX(-102%);transition:transform .22s ease;
  }
  .toc.open{transform:none}
  .toc-backdrop{position:fixed;inset:0;background:rgba(28,27,25,.38);z-index:74}
  .toc-backdrop.open{display:block}
  .toc a{padding:9px 10px;font-size:14.5px;min-height:38px}
  [data-act="toc-toggle"]{display:none}
  .toc a.l3{padding-left:22px}
  .mbar{display:flex;align-items:center;gap:10px;position:sticky;top:0;z-index:30;
    background:linear-gradient(var(--bg) 72%,rgba(247,246,243,0));padding:8px 0 10px}
  .mbar .tag{min-height:38px;padding:0 14px;font-size:13.5px}
  .mbar-t{font-size:13px;color:var(--ink3);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
}

@media(max-width:760px){
  /* 顶栏：收起横向导航，只留品牌 */
  .topbar-in{padding:8px 14px}
  .nav{display:none}
  .brand .bt{font-size:14.5px}
  .wrap{padding:18px 14px calc(150px + env(safe-area-inset-bottom))}
  h1{font-size:21px}
  .sub{font-size:13.5px}

  /* 底部 tab */
  .tabbar{
    display:grid;grid-template-columns:repeat(5,1fr);
    position:fixed;left:0;right:0;bottom:0;z-index:70;
    background:rgba(255,254,251,.97);backdrop-filter:blur(10px);
    border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);
  }
  .tabbar a,.tabbar button{display:flex;flex-direction:column;align-items:center;justify-content:center;
    gap:3px;padding:8px 0 7px;min-height:54px;font-size:11px;color:var(--ink3);
    text-decoration:none;border:0;background:none}
  .tabbar .ti{font-size:19px;line-height:1}
  .tabbar .on{color:var(--brand);font-weight:600}

  /* 更多面板 */
  .more-sheet{position:fixed;inset:0;z-index:80;background:rgba(28,27,25,.38)}
  .more-sheet.open{display:block}
  .ms-card{position:absolute;left:0;right:0;bottom:0;background:var(--panel);
    border-radius:18px 18px 0 0;padding:16px 14px calc(24px + env(safe-area-inset-bottom));
    display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .ms-card a{display:flex;align-items:center;gap:10px;padding:10px 12px;min-height:54px;
    border:1px solid var(--line);border-radius:12px;font-size:15px;color:var(--ink)}
  .ms-card .ti{font-size:19px}

  /* 做题：头部太挤，隐藏进度条（题号已表达进度） */
  .exam-head .progress{display:none}
  .exam-head{gap:8px}
  .exam-head .tag{padding:2px 9px}

  /* 做题：按钮与选项放大到可点区域 */
  .btn{min-height:46px;padding:0 18px;font-size:15px}
  .opt{padding:14px 16px;min-height:52px}
  .opt .k{width:26px;height:26px;line-height:26px;font-size:13px}
  .actions{gap:8px;z-index:60}
  .actions .btn{flex:1}
  .sheet{grid-template-columns:repeat(6,1fr);gap:6px}
  .sc{height:40px;font-size:12.5px}
  .res-hero{margin-top:10px}
  .rh-main{padding:16px 8px}
  .rh-main b{font-size:32px}
  .rh-item{padding:14px 6px}
  .rq-ans{margin-left:0;width:100%}

  /* 划线工具条：贴底固定，触屏更好按 */
  .selbar{left:10px!important;right:10px;top:auto!important;
    bottom:calc(12px + env(safe-area-inset-bottom));justify-content:space-around;
    padding:10px 12px;border-radius:14px}
  .selbar .sw{width:26px;height:26px}
  .selbar button[data-a]{min-height:40px;padding:0 10px;font-size:14px}
  .note-edit{left:10px!important;right:10px;width:auto;top:auto!important;
    bottom:calc(12px + env(safe-area-inset-bottom));border-radius:14px}
  .note-edit textarea{height:110px;font-size:16px}
  .back-fab{bottom:calc(78px + env(safe-area-inset-bottom))}
}

@media(max-width:360px){
  .tabbar a,.tabbar button{font-size:10.5px}
  .ms-card{grid-template-columns:1fr}
  .grid.g2.g3{grid-template-columns:1fr}
}
@media(max-width:420px){
  .tabbar a,.tabbar button{font-size:10.5px}
}

/* 教材/讲义/四色 分段切换 */
.seg{display:flex;gap:4px;background:var(--line2);padding:4px;border-radius:12px;
  width:max-content;max-width:100%;overflow:auto;margin-bottom:16px}
.seg a{padding:7px 14px;border-radius:9px;font-size:14px;color:var(--ink2);white-space:nowrap}
.seg a.on{background:var(--panel);color:var(--brand);font-weight:600;box-shadow:0 1px 3px rgba(0,0,0,.06)}
@media(max-width:760px){.seg{width:100%}.seg a{flex:1;text-align:center;min-height:40px;
  display:flex;align-items:center;justify-content:center}}

/* 进度同步 */
.sync-code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:21px;letter-spacing:2px;
  font-weight:600;color:var(--brand);background:var(--brand-soft);border:1px dashed #cfe0d9;
  border-radius:12px;padding:14px 16px;text-align:center;user-select:all;word-break:break-all}

/* 题目标记 */
.tag.flag{background:#f3f0e8;color:var(--ink2);cursor:pointer;border:1px solid transparent;
  font-size:12.5px;padding:3px 9px;min-height:28px}
.tag.flag:hover{border-color:var(--line)}
.tag.flag.on{background:#fdf2e3;color:#9a5b00;border-color:#f0dcc0;font-weight:600}