/* ============================================================
   大连交通大学 · 软件工程自考学习系统
   样式表：桌面 / 平板 / 手机三端自适应
   - ≥1025px  桌面：顶部导航 + 内容居中
   - 721~1024 平板：顶部导航，容器与字号略放大
   - ≤720px   手机：导航移到底部标签栏，卡片式表格，加大点击区
   ============================================================ */
:root{
  --bg:#f6f7fb; --panel:#ffffff; --panel-2:#f0f2f8; --text:#1b1f2a; --muted:#6b7280;
  --line:#e3e6ef; --brand:#1f6feb; --brand-soft:#e8f0fe; --ok:#0f9d58; --ok-soft:#e6f6ee;
  --bad:#d93025; --bad-soft:#fdecea; --warn:#b26a00; --warn-soft:#fff5e6;
  --radius:14px; --shadow:0 1px 2px rgba(16,24,40,.05),0 8px 24px rgba(16,24,40,.06);
  /* 刘海屏 / 圆角屏安全区 */
  --sat:env(safe-area-inset-top,0px);
  --sab:env(safe-area-inset-bottom,0px);
  --sal:env(safe-area-inset-left,0px);
  --sar:env(safe-area-inset-right,0px);
  --tabbar:0px;           /* 手机端底部标签栏高度，在媒体查询里赋值 */
  --tap:34px;             /* 最小点击区 */
}
html[data-theme="dark"]{
  --bg:#11141b; --panel:#181c25; --panel-2:#1f2430; --text:#e7eaf3; --muted:#98a1b3;
  --line:#2a3040; --brand:#5a9bff; --brand-soft:#1c2a44; --ok:#3ddc84; --ok-soft:#16301f;
  --bad:#ff7b6b; --bad-soft:#361a18; --warn:#ffc46b; --warn-soft:#33270f;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-padding-top:70px;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{
  background:var(--bg); color:var(--text); font-size:15.5px; line-height:1.65;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  padding-bottom:calc(var(--tabbar) + var(--sab));
  -webkit-tap-highlight-color:transparent;
}
a{color:var(--brand);text-decoration:none}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .5em}
p{margin:0 0 .8em}
img,svg,video{max-width:100%;height:auto}
.muted{color:var(--muted)}
.small{font-size:13px}
.hr{height:1px;background:var(--line);margin:18px 0}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:8px}
/* 触摸设备：去掉 300ms 延迟与双击缩放 */
a,button,input,select,textarea,label,.opt,.qdot,.pill,.flipcard{touch-action:manipulation}

/* ---------- layout ---------- */
.topbar{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:14px;
  padding:calc(10px + var(--sat)) calc(18px + var(--sar)) 10px calc(18px + var(--sal));
  background:var(--panel);
  background:color-mix(in srgb,var(--panel) 88%,transparent);
  backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;color:inherit;text-decoration:none;flex:0 0 auto;min-width:0}
.logo{font-size:22px;flex:0 0 auto}
.brand-text{display:flex;flex-direction:column;line-height:1.2;min-width:0}
.brand-text strong{font-size:15px;white-space:nowrap}
.brand-text small{font-size:11.5px;color:var(--muted);white-space:nowrap}
.mainnav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.mainnav a{
  padding:6px 12px;border-radius:999px;color:var(--muted);font-size:14px;white-space:nowrap;
  display:inline-flex;align-items:center;justify-content:center;
}
.mainnav a i{display:none;font-style:normal}
.mainnav a.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
.iconbtn{
  border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:10px;
  width:36px;height:36px;cursor:pointer;font-size:15px;line-height:1;flex:0 0 auto;
}
.app{max-width:1080px;margin:0 auto;padding:22px calc(18px + var(--sar)) 60px calc(18px + var(--sal))}
.footer{max-width:1080px;margin:0 auto;padding:0 calc(18px + var(--sar)) 40px calc(18px + var(--sal));color:var(--muted);font-size:12.5px}
.loading,.empty{padding:60px 0;text-align:center;color:var(--muted)}

/* ---------- generic ---------- */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);margin-bottom:16px}
.card.tight{padding:14px}
.grid{display:grid;gap:14px}
.grid.sub{grid-template-columns:repeat(auto-fill,minmax(min(280px,100%),1fr))}
.grid.stat{grid-template-columns:repeat(auto-fill,minmax(min(150px,100%),1fr))}
.grid.stat>.card{margin-bottom:0}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row.between{justify-content:space-between}
.spacer{flex:1}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line);background:var(--panel);
  color:var(--text);padding:8px 14px;border-radius:10px;cursor:pointer;font-size:14px;font-family:inherit;
  min-height:var(--tap);text-align:center;
}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.ghost{background:transparent}
.btn.sm{padding:5px 10px;font-size:13px;min-height:0}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn:active:not(:disabled){filter:brightness(.96)}
.badge{display:inline-block;padding:1px 8px;border-radius:999px;font-size:12px;background:var(--panel-2);color:var(--muted);border:1px solid var(--line)}
.badge.brand{background:var(--brand-soft);color:var(--brand);border-color:transparent}
.badge.ok{background:var(--ok-soft);color:var(--ok);border-color:transparent}
.badge.bad{background:var(--bad-soft);color:var(--bad);border-color:transparent}
.badge.warn{background:var(--warn-soft);color:var(--warn);border-color:transparent}
input[type=text],input[type=search],select,textarea{
  font-family:inherit;font-size:14.5px;color:var(--text);background:var(--panel);
  border:1px solid var(--line);border-radius:10px;padding:8px 11px;width:100%;min-height:var(--tap);
}
textarea{min-height:110px;resize:vertical;line-height:1.6}
select{cursor:pointer}
label.chk{display:inline-flex;align-items:center;gap:6px;cursor:pointer;font-size:14px;color:var(--muted)}
label.chk input[type=checkbox]{width:18px;height:18px;flex:0 0 auto;accent-color:var(--brand)}
.stat-num{font-size:26px;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums}
.stat-lbl{font-size:12.5px;color:var(--muted)}
.bar{height:8px;border-radius:999px;background:var(--panel-2);overflow:hidden;max-width:380px}
.bar>i{display:block;height:100%;background:var(--brand);border-radius:999px;transition:width .3s}
.bar.ok>i{background:var(--ok)}
.bar.warn>i{background:var(--warn)}

/* ---------- subject card ---------- */
.subcard{display:flex;flex-direction:column;gap:8px}
.subcard h3{margin:0;font-size:16px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.subcard .code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;color:var(--muted)}
.subcard .desc{font-size:13px;color:var(--muted);flex:1}
.tagrow{display:flex;gap:6px;flex-wrap:wrap}

/* ---------- markdown ---------- */
.md{font-size:15px;overflow-wrap:break-word}
.md h1{font-size:22px;margin-top:.2em}
.md h2{font-size:18px;margin-top:1.5em;padding-bottom:.3em;border-bottom:1px solid var(--line)}
.md h3{font-size:16px;margin-top:1.2em}
.md h4{font-size:15px;margin-top:1em;color:var(--muted)}
.md ul,.md ol{padding-left:1.4em;margin:0 0 .9em}
.md li{margin:.25em 0}
.md blockquote{
  margin:0 0 .9em;padding:8px 14px;border-left:3px solid var(--brand);
  background:var(--brand-soft);border-radius:0 8px 8px 0;color:var(--text);
}
.md blockquote p:last-child{margin:0}
.md code{background:var(--panel-2);padding:1px 5px;border-radius:5px;font-size:.88em;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:break-word}
.md pre{background:var(--panel-2);padding:12px 14px;border-radius:10px;overflow:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line)}
.md pre code{background:none;padding:0;white-space:pre}
.md table{width:100%;border-collapse:collapse;margin:0 0 1em;font-size:14px;display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
.md th,.md td{border:1px solid var(--line);padding:7px 10px;text-align:left;vertical-align:top}
.md th{background:var(--panel-2);font-weight:600;white-space:nowrap}
.md hr{border:0;border-top:1px solid var(--line);margin:1.4em 0}
.md .kbd{font-family:ui-monospace,Menlo,monospace;font-size:.85em}

/* ---------- toc / 列表 ---------- */
.doclist{list-style:none;padding:0;margin:0}
.doclist li{border-bottom:1px solid var(--line)}
.doclist li:last-child{border-bottom:0}
.doclist a{display:flex;gap:10px;align-items:center;padding:11px 2px;color:inherit;min-height:44px}
.doclist a>span{min-width:0}
.doclist a:hover{color:var(--brand)}

/* ---------- quiz ---------- */
.qmeta{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}
.stem{font-size:16.5px;font-weight:600;margin:12px 0 14px;overflow-wrap:break-word}
.stem p:last-child{margin-bottom:0}
.stem pre,.opt pre{font-weight:400;font-size:13.5px;background:var(--panel-2);padding:12px 14px;border-radius:10px;overflow:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);line-height:1.5}
.stem code,.opt code,.card code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--panel-2);padding:1px 5px;border-radius:5px;font-size:.88em;font-weight:400;overflow-wrap:break-word}
.stem pre code,.opt pre code{background:none;padding:0;font-size:inherit}
.opts{display:flex;flex-direction:column;gap:9px;margin-bottom:12px}
.opt{
  display:flex;gap:11px;align-items:flex-start;padding:11px 13px;border:1px solid var(--line);
  border-radius:11px;cursor:pointer;background:var(--panel);transition:background .12s,border-color .12s;
}
.opt .key{
  flex:0 0 auto;width:24px;height:24px;border-radius:50%;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:600;color:var(--muted);
}
.opt>span:last-child{min-width:0;overflow-wrap:break-word}
.opt.sel{border-color:var(--brand);background:var(--brand-soft)}
.opt.sel .key{border-color:var(--brand);background:var(--brand);color:#fff}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}
.opt.right .key{border-color:var(--ok);background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt.wrong .key{border-color:var(--bad);background:var(--bad);color:#fff}
.opt.locked{cursor:default}
.explain{border-left:3px solid var(--brand);background:var(--brand-soft);padding:10px 14px;border-radius:0 10px 10px 0;margin:12px 0;overflow-wrap:break-word}
.explain.ok{border-color:var(--ok);background:var(--ok-soft)}
.explain.bad{border-color:var(--bad);background:var(--bad-soft)}
.pillbar{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 14px}
.pill{
  border:1px solid var(--line);background:var(--panel);border-radius:999px;padding:4px 11px;
  font-size:13px;cursor:pointer;color:var(--muted);font-family:inherit;
}
.pill:active:not(:disabled){background:var(--panel-2)}
.pill.active{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
.pill:disabled{opacity:.45;cursor:not-allowed}
.qgrid{display:flex;flex-wrap:wrap;gap:6px}
.qdot{
  width:32px;height:32px;border-radius:8px;border:1px solid var(--line);background:var(--panel);
  font-size:12.5px;font-family:inherit;cursor:pointer;color:var(--muted);
}
.qdot.right{background:var(--ok-soft);border-color:var(--ok);color:var(--ok)}
.qdot.wrong{background:var(--bad-soft);border-color:var(--bad);color:var(--bad)}
.qdot.now{outline:2px solid var(--brand);outline-offset:1px;font-weight:700;color:var(--text)}
.qdot.done{background:var(--panel-2)}

/* ---------- flashcard ---------- */
.flipcard{perspective:1400px;height:250px;height:clamp(228px,38dvh,300px);margin-bottom:14px;cursor:pointer}
.flipcard .inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flipcard.flipped .inner{transform:rotateY(180deg)}
.flipcard .face{
  position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);box-shadow:var(--shadow);padding:22px;display:flex;flex-direction:column;
  justify-content:center;align-items:center;text-align:center;overflow:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;
}
.flipcard .back{transform:rotateY(180deg);align-items:stretch;text-align:left;font-size:14.5px}
.flipcard .face .hint{position:absolute;bottom:8px;font-size:11.5px;color:var(--muted)}

/* ---------- 数据表格 ---------- */
table.data{width:100%;border-collapse:collapse;font-size:14px}
table.data th,table.data td{border-bottom:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
table.data th{color:var(--muted);font-weight:600;font-size:12.5px;background:var(--panel-2)}
table.data td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
table.kv th{width:110px}

/* ---------- 回到顶部 ---------- */
.totop{
  position:fixed;right:calc(16px + var(--sar));bottom:calc(18px + var(--sab));z-index:55;
  width:44px;height:44px;border-radius:50%;border:1px solid var(--line);background:var(--panel);
  color:var(--text);box-shadow:var(--shadow);font-size:17px;line-height:1;cursor:pointer;
  opacity:0;transform:translateY(10px);pointer-events:none;transition:opacity .18s,transform .18s;
}
.totop.show{opacity:1;transform:none;pointer-events:auto}

/* ---------- 指针设备才有 hover 反馈 ---------- */
@media (hover:hover) and (pointer:fine){
  a:hover{text-decoration:underline}
  .mainnav a:hover{background:var(--panel-2);text-decoration:none;color:var(--text)}
  .btn:hover{background:var(--panel-2);text-decoration:none}
  .btn.primary:hover{background:var(--brand);filter:brightness(1.07)}
  .iconbtn:hover{background:var(--panel-2)}
  .opt:hover{background:var(--panel-2)}
  .opt.locked:hover{background:var(--panel)}
  .pill:hover{background:var(--panel-2)}
  .doclist a:hover{color:var(--brand)}
  .qdot:hover{border-color:var(--brand)}
}
@media (hover:none){
  .opt:active{background:var(--panel-2)}
  .opt.locked:active{background:var(--panel)}
}

/* ============================================================
   平板（721~1024px）：字号与间距稍放大，卡片区更宽松
   ============================================================ */
@media (min-width:721px) and (max-width:1024px){
  body{font-size:16px}
  .app{padding:22px 20px 64px}
  .footer{padding:0 20px 40px}
  .flipcard{height:300px;height:clamp(260px,36dvh,340px)}
  .grid.sub{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
  .md{font-size:15.5px}
  .stem{font-size:17px}
  /* 表格列多，平板上把单元格收窄一点，保证 8 列也能放下 */
  table.data{font-size:13.5px}
  table.data th,table.data td{padding:8px 7px}
  .md table{font-size:13.5px}
}
@media (min-width:1101px){
  .app,.footer{max-width:1120px}
}

/* ============================================================
   手机（≤720px）：底部标签栏 + 卡片式表格 + 大点击区
   ============================================================ */
@media (max-width:720px){
  :root{--tabbar:58px;--tap:42px}
  html{scroll-padding-top:12px}
  .topbar{
    position:static;gap:10px;
    /* 关键：这里必须去掉 backdrop-filter。带 filter/backdrop-filter 的元素会成为
       position:fixed 后代的「包含块」，会让底部标签栏被夹在顶栏内部显示。
       手机端顶栏是静态的，本来也不需要毛玻璃。 */
    -webkit-backdrop-filter:none;backdrop-filter:none;background:var(--panel);
    padding:calc(8px + var(--sat)) calc(12px + var(--sar)) 8px calc(12px + var(--sal));
  }
  .logo{font-size:20px}
  .brand-text strong{font-size:14.5px}
  .brand-text small{display:none}
  .iconbtn{width:40px;height:40px;font-size:17px}
  .app{padding:14px calc(12px + var(--sar)) 24px calc(12px + var(--sal))}
  .footer{padding:0 calc(12px + var(--sar)) 20px calc(12px + var(--sal))}

  /* 底部标签栏 */
  .mainnav{
    position:fixed;left:0;right:0;bottom:0;z-index:60;margin:0;
    display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;flex-wrap:nowrap;
    padding:6px calc(6px + var(--sar)) calc(6px + var(--sab)) calc(6px + var(--sal));
    background:var(--panel);
    background:color-mix(in srgb,var(--panel) 92%,transparent);
    backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);
    border-top:1px solid var(--line);box-shadow:0 -4px 18px rgba(16,24,40,.08);
  }
  .mainnav a{
    flex-direction:column;gap:2px;padding:4px 2px;border-radius:12px;font-size:11px;line-height:1.2;
    min-height:44px;white-space:nowrap;color:var(--muted);position:relative;
  }
  .mainnav a i{display:block;font-size:19px;line-height:1.1}
  .mainnav a.active{background:transparent;color:var(--brand);font-weight:600}
  .mainnav a.active::before{
    content:"";position:absolute;top:-6px;left:50%;transform:translateX(-50%);
    width:22px;height:3px;border-radius:0 0 3px 3px;background:var(--brand);
  }
  .totop{bottom:calc(70px + var(--sab));width:42px;height:42px}

  /* 触摸目标加大 */
  .btn{padding:10px 14px;font-size:14.5px;min-height:var(--tap)}
  .btn.sm{padding:8px 12px;font-size:13.5px;min-height:36px}
  .pill{padding:7px 13px;font-size:13.5px;min-height:34px}
  .qdot{width:36px;height:36px;font-size:13px;border-radius:9px}
  .opt{padding:12px 13px;gap:10px}
  .opt .key{width:26px;height:26px}
  .iconbtn{flex:0 0 auto}
  /* 输入框 ≥16px，避免 iOS 聚焦时自动放大页面 */
  input[type=text],input[type=search],select,textarea{font-size:16px;padding:10px 12px}
  .loading,.empty{padding:44px 8px}

  /* 卡片与标题 */
  .card{padding:15px;border-radius:13px;margin-bottom:12px}
  .card.tight{padding:12px}
  .grid{gap:11px}
  .hr{margin:14px 0}
  .stat-num{font-size:22px}
  .stem{font-size:16px;margin:10px 0 12px}
  .md{font-size:15px}
  .md h1{font-size:20px}
  .md h2{font-size:17px}
  .row{gap:8px}
  .subcard h3{font-size:15.5px}

  /* 列表项：摘要换行到第二行 */
  .doclist a{flex-wrap:wrap;padding:12px 2px;gap:8px}
  .doclist a .spacer{display:none}
  .doclist a .small.muted{flex:0 0 100%;font-size:12px}

  /* 闪卡：充分利用竖屏高度 */
  .flipcard{height:250px;height:clamp(240px,46dvh,360px)}
  .flipcard .face{padding:18px 16px}
  .flipcard .face .hint{bottom:6px}

  /* 表格 → 卡片式（≤820px 生效，见下方单独查询） */
}

/* 表格卡片化：手机上横向 8 列表格不可用，改为「一行一张卡」；
   平板（≥641px）宽度够，保留真正的表格 */
@media (max-width:640px){
  table.data:not(.kv){display:block;border-collapse:separate;border-spacing:0}
  table.data:not(.kv) thead{display:none}
  table.data:not(.kv) tbody{display:block}
  table.data:not(.kv) tr{
    display:block;background:var(--panel);border:1px solid var(--line);border-radius:12px;
    padding:8px 12px;margin-bottom:10px;box-shadow:var(--shadow);
  }
  table.data:not(.kv) td{
    display:flex;align-items:baseline;justify-content:space-between;gap:14px;
    border:0;border-bottom:1px dashed var(--line);padding:6px 0;font-size:14px;
  }
  table.data:not(.kv) td:last-child{border-bottom:0}
  table.data:not(.kv) td::before{
    content:attr(data-label);flex:0 0 auto;color:var(--muted);font-size:12.5px;
  }
  table.data:not(.kv) td:first-child{
    display:block;font-weight:600;font-size:15px;padding:2px 0 8px;
    border-bottom:1px solid var(--line);margin-bottom:4px;
  }
  table.data:not(.kv) td:first-child::before{content:none}
  table.data:not(.kv) td.num{white-space:normal}
  table.kv tr{display:flex;flex-direction:column;gap:2px;padding:9px 0;border-bottom:1px dashed var(--line)}
  table.kv tr:last-child{border-bottom:0}
  table.kv th{width:auto;background:none;border:0;padding:0;font-size:12.5px}
  table.kv td{border:0;padding:0}
}

/* 手机横屏：高度紧张时压缩留白 */
@media (max-width:900px) and (max-height:520px){
  .flipcard{height:200px;height:clamp(190px,56dvh,240px)}
  .app{padding-top:10px}
}

/* ---------- 无障碍：跟随系统减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .flipcard .inner{transition:none}
  .bar>i{transition:none}
}

/* ---------- 打印 ---------- */
@media print{
  .topbar,.footer,.btn,.pillbar,.totop,.mainnav{display:none!important}
  .app{max-width:none;padding:0;margin:0}
  body{padding-bottom:0;font-size:12pt;background:#fff}
  .card{box-shadow:none;border:0;padding:0;margin-bottom:14px;break-inside:avoid}
  .md table{display:table;overflow:visible}
  a{color:inherit}
}

/* Focused study workspace */
:root{--brand:#27685f;--brand-soft:#e8f3ef;--bg:#f5f7f6;--radius:18px;--shadow:0 3px 16px rgba(31,58,48,.035)}
html[data-theme="dark"]{--brand:#82cdb9;--brand-soft:#203d35;--bg:#111917;--panel:#19231f;--panel-2:#22302b;--line:#33453d;--text:#edf3ef;--muted:#adbbb3}
html[data-theme="dark"] .btn.primary{color:#10241d}
.home-hero{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:20px 2px 28px}
.home-hero h1{font-size:clamp(23px,3vw,32px);letter-spacing:-.6px;margin:8px 0 10px}
.home-hero p{margin:0}.eyebrow{color:var(--brand);font-size:12px;letter-spacing:2px;font-weight:650}
.countdown{min-width:210px;background:var(--brand-soft);border:1px solid var(--line);border-radius:18px;padding:16px 22px;display:flex;flex-direction:column;gap:1px;color:var(--brand)}
.countdown strong{font-size:34px;line-height:1.3;font-variant-numeric:tabular-nums}.countdown small{font-size:15px}.countdown span,.countdown a{font-size:12px}.countdown a{margin-top:4px}
.selection-card summary{display:flex;justify-content:space-between;align-items:center;gap:12px;cursor:pointer;min-height:36px;font-weight:600;list-style:none}.selection-card summary::-webkit-details-marker{display:none}
.selection-card details[open] summary{margin-bottom:12px}.selection-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}
.subject-choice{display:flex;align-items:flex-start;gap:9px;border:1px solid var(--line);padding:12px;border-radius:12px;cursor:pointer;background:var(--panel);min-width:0;line-height:1.5}
.subject-choice.selected{background:var(--brand-soft);border-color:var(--brand)}.subject-choice:has(input:disabled){opacity:.5;cursor:default}
.subject-choice input{accent-color:var(--brand);width:17px;height:17px;flex-shrink:0;margin-top:3px}.subject-choice strong{font-size:13px;font-weight:550;display:block}.subject-choice small{display:block;font-size:11px;color:var(--muted);margin-top:4px}
.selection-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.section-heading{margin:26px 0 14px}.section-heading h2{font-size:19px;margin:0}.course-progress{padding:22px;margin-bottom:0}.course-progress h3{font-size:19px;margin:16px 0 24px}.course-progress .bar{height:6px;margin:8px 0 18px}.course-progress .row:last-child{margin-top:20px}
.home-links{justify-content:center;gap:24px;padding-top:8px;font-size:12px}.storage-warning{position:fixed;bottom:calc(var(--tabbar) + var(--sab) + 15px);left:15px;right:15px;padding:14px;background:var(--warn-soft);color:var(--warn);border:1px solid var(--warn);border-radius:12px;z-index:1000}
button.opt{width:100%;text-align:left;font:inherit;color:inherit;background:var(--panel)}button.opt.sel{background:var(--brand-soft)}button.opt.right{background:var(--ok-soft)}button.opt.wrong{background:var(--bad-soft)}
.opt .key{flex-shrink:0}.opt>span:last-child{min-width:0;overflow-wrap:anywhere}.opt pre{white-space:pre-wrap}
.bar{overflow:hidden}summary:focus-visible{outline:2px solid var(--brand)}
@media(min-width:821px){.grid.sub:has(.course-progress){grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:820px){.selection-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.home-hero{gap:14px}.countdown{min-width:155px;padding:14px}.course-progress{padding:18px}.btn.sm{min-height:40px}.subject-choice{min-height:72px}.section-heading{margin-top:22px}}
@media(max-width:480px){.home-hero{display:block;padding:10px 0 20px}.home-hero h1{font-size:25px}.countdown{margin-top:20px;display:grid;grid-template-columns:1fr auto;gap:3px 12px;padding:14px 18px}.countdown strong{grid-column:2;grid-row:1 / 4;align-self:center;font-size:32px}.countdown span,.countdown a{grid-column:1}.countdown a{margin-top:0}.selection-grid{gap:7px}.subject-choice{padding:10px 8px;gap:6px}.selection-actions{align-items:stretch;flex-direction:column}.selection-actions .btn{width:100%}.course-progress h3{font-size:18px}.home-links{gap:12px}.selection-card{padding:15px}}
.section-heading + .grid{margin-bottom:18px}
.coverage-list{list-style:none;padding:0;margin:12px 0 0}.coverage-list li{border-top:1px solid var(--line);padding:12px 0}.coverage-list li>strong{font-size:14px;margin-right:10px}.coverage-list li>p{margin:6px 0 0;overflow-wrap:anywhere}
@media(max-width:720px){.pill{min-height:42px}.qdot{width:42px;height:42px}.iconbtn{min-width:42px;min-height:42px}}
.schedule-notice{padding:12px 16px;margin:0 0 18px;border-radius:12px;background:var(--warn-soft);border:1px solid var(--line);font-size:12px;overflow-wrap:anywhere}.schedule-notice strong{color:var(--warn)}.schedule-notice p{margin:6px 0}.schedule-notice a{font-size:12px}#draftScheduleWarning .schedule-notice{margin:14px 0 0}

.selection-card:has(details[open]) + .schedule-notice{display:none}
.grid.sub>.subcard{margin-bottom:0}.subcard p{margin:0}.subcard .btn{align-self:flex-start}
@media(max-width:720px){.app h1{font-size:24px}.app h2{font-size:20px}.app .md h1{font-size:20px}}