/* ===========================================================================
   基础争霸赛 · 学生端（养眼绿 + 玻璃质感；红色只给警示）
=========================================================================== */
:root{
  --brand:#2f8f63; --brand-deep:#1f6b49; --brand-soft:#eaf7ee;
  --ink:#22402f; --dim:#6d8a79; --line:rgba(47,143,99,.20);
  --card:rgba(255,255,255,.82); --red:#d1482f; --gold:#c8912b;
  --radius:20px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;min-height:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
  color:var(--ink); min-height:100vh; padding:16px 16px 44px;
  background:
    radial-gradient(1000px 640px at 8% -10%, #f8fdf9 0%, rgba(248,253,249,0) 60%),
    radial-gradient(760px 520px at 104% 6%, #dcf3e4 0%, rgba(220,243,228,0) 55%),
    linear-gradient(158deg,#eaf7ee,#d5efdd 52%,#c6e9d5 100%);
  background-attachment:fixed;
}
a{text-decoration:none;color:inherit}
.wrap{max-width:920px;margin:0 auto;position:relative;z-index:1}
.glass{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  backdrop-filter:blur(12px);box-shadow:0 16px 36px rgba(31,107,73,.13)}
.panel{padding:18px 20px}
.topbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.brand{font-size:20px;font-weight:900;letter-spacing:1px;color:var(--brand-deep)}
.brand em{font-style:normal;color:var(--brand)}
.who{margin-left:auto;font-size:13px;color:var(--dim)}
h1{font-size:clamp(20px,3vw,28px);margin:0 0 6px}
.sub{color:var(--dim);font-size:13px;margin:0 0 14px;line-height:1.7}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:11px 20px;border-radius:999px;border:1px solid var(--line);
  background:rgba(255,255,255,.9);color:var(--brand-deep);font-weight:800;font-size:15px;
  cursor:pointer;font-family:inherit;transition:transform .12s ease,box-shadow .12s ease}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 18px rgba(47,143,99,.18)}
.btn:active{transform:translateY(1px)}
.btn.primary{background:linear-gradient(150deg,#57c48c,#2f8f63);color:#fff;border-color:transparent;
  box-shadow:0 10px 22px rgba(47,143,99,.28)}
.btn.primary:hover{box-shadow:0 14px 26px rgba(47,143,99,.34)}
.btn.big{padding:15px 30px;font-size:17px}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.btn.ghost{background:transparent}

/* 注册/登录 */
.auth-tabs{display:flex;gap:6px;background:rgba(255,255,255,.6);border:1px solid var(--line);
  border-radius:999px;padding:4px;margin-bottom:16px}
.auth-tabs a{flex:1;text-align:center;padding:10px;border-radius:999px;font-weight:800;font-size:14.5px;color:var(--dim)}
.auth-tabs a.on{background:linear-gradient(150deg,#57c48c,#2f8f63);color:#fff;box-shadow:0 6px 14px rgba(47,143,99,.26)}
.field{margin-bottom:12px}
.field label{display:block;font-size:13px;font-weight:700;color:var(--dim);margin-bottom:6px}
.field input,.field select{width:100%;padding:13px 14px;border-radius:14px;font-size:16px;
  border:1px solid var(--line);background:rgba(255,255,255,.9);color:var(--ink);font-family:inherit}
.field input:focus,.field select:focus{outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(47,143,99,.14)}
.classpick{display:flex;gap:8px}
.classpick label{flex:1;text-align:center;padding:12px;border-radius:14px;border:1px solid var(--line);
  background:rgba(255,255,255,.7);font-weight:800;cursor:pointer}
.classpick input{display:none}
.classpick input:checked + span{color:var(--brand-deep)}
.classpick label:has(input:checked){border-color:var(--brand);background:var(--brand-soft);
  box-shadow:inset 0 0 0 1px var(--brand)}
.msg{padding:11px 15px;border-radius:14px;background:rgba(47,143,99,.12);
  border:1px solid rgba(47,143,99,.3);font-size:14px;font-weight:700;margin-bottom:12px;color:var(--brand-deep)}
.err{padding:11px 15px;border-radius:14px;background:rgba(209,72,47,.10);
  border:1px solid rgba(209,72,47,.32);font-size:14px;font-weight:700;margin-bottom:12px;color:#a53a26}

/* 统计卡 */
.statrow{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin-bottom:14px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px 12px;text-align:center}
.stat b{display:block;font-size:24px;color:var(--brand-deep);line-height:1.2}
.stat span{font-size:12px;color:var(--dim)}
.stat b.gold{color:var(--gold)}

/* 答题 */
.qhead{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.dots{display:flex;gap:6px;margin-left:auto}
.dot{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;
  font-size:12px;font-weight:800;background:rgba(255,255,255,.8);border:1px solid var(--line);color:var(--dim)}
.dot.done{background:var(--brand-soft);color:var(--brand-deep);border-color:var(--brand)}
.dot.ok{background:#2f8f63;color:#fff;border-color:#2f8f63}
.dot.bad{background:#d1482f;color:#fff;border-color:#d1482f}
.dot.now{box-shadow:0 0 0 3px rgba(47,143,99,.22)}
.stem{font-size:18px;line-height:1.85;margin:6px 0 16px;font-weight:600}
.opts{display:grid;gap:10px}
.opt{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border-radius:16px;
  border:1px solid var(--line);background:rgba(255,255,255,.9);cursor:pointer;font-size:16px;
  line-height:1.7;transition:transform .1s ease,border-color .15s ease,background .15s ease}
.opt:hover{border-color:var(--brand);transform:translateY(-1px)}
.opt input{display:none}
.opt .tag{flex:0 0 30px;height:30px;border-radius:10px;display:grid;place-items:center;
  font-weight:900;background:var(--brand-soft);color:var(--brand-deep)}
.opt.sel{border-color:var(--brand);background:var(--brand-soft);box-shadow:inset 0 0 0 1px var(--brand)}
.opt.right{border-color:#2f8f63;background:rgba(47,143,99,.16)}
.opt.wrong{border-color:#d1482f;background:rgba(209,72,47,.12)}
.opt .tag.right{background:#2f8f63;color:#fff}
.opt .tag.wrong{background:#d1482f;color:#fff}
.verdict{margin-top:16px;padding:16px;border-radius:16px;border:1px dashed var(--line);background:rgba(255,255,255,.7)}
.verdict b{display:block;font-size:16px;margin-bottom:8px}
.verdict.ok b{color:#1f6b49}
.verdict.no b{color:#a53a26}
.verdict p{margin:6px 0 0;font-size:14.5px;line-height:1.8;color:#33503f}

/* 福袋 */
.bag{margin-top:16px;padding:22px;border-radius:20px;text-align:center;
  background:linear-gradient(150deg,rgba(255,246,224,.95),rgba(255,236,201,.9));
  border:1px solid rgba(200,145,43,.4)}
.bag b{display:block;font-size:30px;color:#a97a2f;margin:6px 0}
.bag p{margin:6px 0 14px;font-size:14px;color:#7a5f2a;line-height:1.7}
.bag.plain{background:rgba(255,255,255,.75);border-color:var(--line)}
.bag.plain b{color:var(--brand-deep);font-size:22px}

/* 加点字（PDF 着重号）：点画在字正下方，而不是错位到字后面 */
.zd{
  text-emphasis: dot;
  text-emphasis-position: under right;
  -webkit-text-emphasis: dot;
  -webkit-text-emphasis-position: under right;
  text-emphasis-color: currentColor;
  -webkit-text-emphasis-color: currentColor;
  /* 兼容不支持 text-emphasis 的浏览器：加一条虚线下划线，至少不丢信息 */
  padding: 0 .02em;
}
@supports not (text-emphasis: dot){
  .zd{ border-bottom: 2px dotted currentColor; }
}

/* 插图（题库里的 <img>）：限宽、居中、圆角，不撑破卡片 */
.stem img, .opt img, .verdict img{
  display:block; max-width:100%; height:auto; margin:10px 0;
  border-radius:10px; border:1px solid var(--line); background:#fff;
}
.stem img, .verdict img{ margin-left:auto; margin-right:auto; }
.opt img{ max-height:180px; margin:8px 0; }

table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:9px 10px;text-align:left;border-bottom:1px solid var(--line)}
th{font-size:12.5px;color:var(--dim);font-weight:700;background:rgba(47,143,99,.06)}
td.num{font-variant-numeric:tabular-nums}
.empty{text-align:center;color:var(--dim);padding:22px}
.card-title{font-size:15px;font-weight:800;margin:0 0 10px;display:flex;align-items:center;gap:8px}
.pill{font-size:12px;font-weight:800;padding:3px 10px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand-deep)}
.pill.red{background:rgba(209,72,47,.12);color:#a53a26}
.pill.gold{background:rgba(200,145,43,.16);color:#8f6a1e}
.muted{color:var(--dim);font-size:12.5px}
.rowline{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:14px}