:root{
    --bg:#0f1226; --card:#1a1f3d; --card2:#232a52; --line:rgba(255,255,255,.08);
    --txt:#eef1ff; --sub:#9aa3c7; --pri:#7c5cff; --pri2:#4dd6ff;
    --ok:#2ecc8f; --bad:#ff5c7a; --gold:#ffc94d;
  }
  *{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
  body{font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--txt);min-height:100vh;
    background-image:radial-gradient(800px 400px at 80% -10%,rgba(124,92,255,.25),transparent),radial-gradient(600px 300px at 0% 100%,rgba(77,214,255,.12),transparent)}
  .wrap{max-width:720px;margin:0 auto;padding:18px 16px 40px}
  .top{display:flex;align-items:center;gap:10px;margin-bottom:16px}
  .top .logo{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--pri),var(--pri2));display:flex;align-items:center;justify-content:center;font-size:20px}
  .top h1{font-size:18px;font-weight:700}
  .top .sub{font-size:11px;color:var(--sub);margin-top:2px}
  .back{margin-left:auto;border:1px solid var(--line);background:var(--card);color:var(--sub);border-radius:10px;padding:8px 14px;font-size:13px;text-decoration:none}
  /* 科目网格 */
  .grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
  .subj{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px 16px;cursor:pointer;transition:.2s;position:relative;overflow:hidden}
  .subj:active{transform:scale(.97)}
  .subj .emoji{font-size:26px;margin-bottom:8px}
  .subj .nm{font-size:15px;font-weight:700}
  .subj .ct{font-size:12px;color:var(--sub);margin-top:4px}
  .subj:after{content:"";position:absolute;right:-20px;top:-20px;width:70px;height:70px;border-radius:50%;background:linear-gradient(135deg,rgba(124,92,255,.28),transparent)}
  /* 答题 */
  .prog{height:8px;background:var(--card);border-radius:99px;overflow:hidden;margin:14px 0 20px}
  .prog i{display:block;height:100%;background:linear-gradient(90deg,var(--pri),var(--pri2));border-radius:99px;transition:width .3s}
  .qmeta{display:flex;justify-content:space-between;font-size:12px;color:var(--sub);margin-bottom:10px}
  .qcard{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:20px 18px}
  .qtext{font-size:16px;line-height:1.7;font-weight:600;white-space:pre-wrap}
  .opts{margin-top:16px;display:flex;flex-direction:column;gap:10px}
  .opt{display:flex;align-items:flex-start;gap:10px;background:var(--card2);border:1.5px solid transparent;border-radius:13px;padding:12px 14px;cursor:pointer;font-size:14px;line-height:1.55;transition:.15s}
  .opt .tag{flex:none;width:26px;height:26px;border-radius:50%;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}
  .opt.sel{border-color:var(--pri);background:rgba(124,92,255,.16)}
  .opt.sel .tag{background:var(--pri)}
  .opt.right{border-color:var(--ok);background:rgba(46,204,143,.14)}
  .opt.wrong{border-color:var(--bad);background:rgba(255,92,122,.14)}
  .nav{display:flex;gap:10px;margin-top:18px}
  .btn{flex:1;border:none;border-radius:13px;padding:13px 0;font-size:15px;font-weight:700;cursor:pointer}
  .btn.ghost{background:var(--card);border:1px solid var(--line);color:var(--sub)}
  .btn.main{background:linear-gradient(135deg,var(--pri),#5a7bff);color:#fff}
  .btn:active{transform:scale(.98)}
  .expl{margin-top:14px;background:rgba(77,214,255,.07);border-left:3px solid var(--pri2);border-radius:0 10px 10px 0;padding:12px 14px;font-size:13px;color:#c4d9ff;line-height:1.7;display:none}
  /* 结果 */
  .score-card{text-align:center;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:30px 20px;margin-bottom:16px}
  .ring{width:120px;height:120px;border-radius:50%;margin:0 auto 14px;display:flex;align-items:center;justify-content:center;
    background:conic-gradient(var(--ok) var(--p,0%),rgba(255,255,255,.07) 0)}
  .ring i{width:96px;height:96px;border-radius:50%;background:var(--card);display:flex;flex-direction:column;align-items:center;justify-content:center;font-style:normal}
  .ring b{font-size:28px}
  .ring span{font-size:11px;color:var(--sub)}
  .score-card h2{font-size:17px;margin-bottom:6px}
  .score-card p{font-size:13px;color:var(--sub)}
  .rvw{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:10px;font-size:13px}
  .rvw .hd{display:flex;gap:8px;align-items:center;font-weight:700;margin-bottom:6px}
  .rvw .ic{width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;color:#fff}
  .rvw .ic.ok{background:var(--ok)} .rvw .ic.bad{background:var(--bad)}
  .rvw .ex{color:var(--sub);line-height:1.6;margin-top:6px;font-size:12px}
  .tip{text-align:center;color:var(--sub);font-size:13px;padding:40px 0}
  .badge{display:inline-block;background:rgba(255,201,77,.14);color:var(--gold);font-size:11px;border-radius:99px;padding:3px 10px;margin-left:6px}