:root{
  --bg:#f5f7fb; --card:#ffffff; --ink:#1b2430; --ink-2:#5b6b7c; --ink-3:#93a1b0;
  --line:#e6ebf2; --primary:#3b6ef6; --primary-2:#7b5cff;
  --ok:#12a150; --ok-bg:#e9f9f0; --bad:#e5484d; --bad-bg:#fdecec;
  --warn:#f0a020; --warn-bg:#fff6e6;
  --shadow:0 6px 24px rgba(27,36,48,.06); --shadow-lg:0 14px 40px rgba(27,36,48,.10); --r:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(900px 420px at 12% -8%, #e8efff 0%, rgba(232,239,255,0) 60%),
    radial-gradient(760px 380px at 92% 0%, #f1eaff 0%, rgba(241,234,255,0) 55%),
    var(--bg);
  color:var(--ink);
  font:15px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  min-height:100vh; -webkit-text-size-adjust:100%;
}
button{font-family:inherit}
a{color:var(--primary);text-decoration:none}
.wrap{max-width:960px;margin:0 auto;padding:20px 16px 72px}

/* ---------- 顶栏 ---------- */
.topbar{position:sticky;top:0;z-index:30;backdrop-filter:saturate(160%) blur(10px);
  background:rgba(255,255,255,.88);border-bottom:1px solid var(--line)}
.topbar-in{max-width:960px;margin:0 auto;padding:11px 16px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px;letter-spacing:.2px;cursor:pointer}
.brand .dot{width:32px;height:32px;border-radius:11px;flex:0 0 auto;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:11.5px;font-weight:800;
  box-shadow:0 6px 16px rgba(59,110,246,.28)}
.brand small{display:block;font-weight:500;color:var(--ink-3);font-size:11.5px}
.spacer{flex:1}
.tabs{display:flex;gap:4px;background:#eef2f8;border:1px solid var(--line);border-radius:999px;padding:4px;
  overflow-x:auto;scrollbar-width:none;max-width:100%}
.tabs::-webkit-scrollbar{display:none}
.tabs button{border:0;background:transparent;border-radius:999px;padding:8px 14px;font-size:13.5px;
  color:var(--ink-2);cursor:pointer;font-weight:600;transition:.18s;white-space:nowrap;display:flex;align-items:center;gap:5px}
.tabs button:hover{color:var(--ink);background:rgba(255,255,255,.7)}
.tabs button.on{background:#fff;color:var(--primary);box-shadow:0 2px 8px rgba(27,36,48,.09)}
.tabs b{background:#e8eefb;color:var(--primary);border-radius:999px;padding:0 7px;font-size:11px;font-weight:700}
.tabs button.on b{background:var(--primary);color:#fff}

/* ---------- 通用 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);
  padding:18px;margin-bottom:14px}
h1{font-size:23px;margin:6px 0 4px;letter-spacing:.3px}
h2{font-size:17px;margin:0 0 10px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
h3{font-size:14.5px;margin:14px 0 6px}
.muted{color:var(--ink-2)}
.small{font-size:13px}
.tiny{font-size:12px;color:var(--ink-3)}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.btn{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:12px;
  padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;transition:.18s}
.btn:hover{border-color:#cfd9e6;box-shadow:0 4px 14px rgba(27,36,48,.07);transform:translateY(-1px)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;border-color:transparent;
  box-shadow:0 8px 20px rgba(59,110,246,.26)}
.btn.primary:hover{box-shadow:0 12px 26px rgba(59,110,246,.34)}
.btn.ghost{background:#f7f9fc}
.btn.danger{color:var(--bad);border-color:#f7cdcf;background:#fff}
.btn.sm{padding:7px 13px;font-size:13px;border-radius:10px}
.btn.lg{padding:13px 26px;font-size:15px}
.badge{display:inline-block;border-radius:999px;padding:2px 10px;font-size:11.5px;font-weight:700}
.badge.blue{background:#eaf1ff;color:#2c56c9}
.badge.green{background:var(--ok-bg);color:var(--ok)}
.badge.red{background:var(--bad-bg);color:var(--bad)}
.badge.orange{background:var(--warn-bg);color:#a86a00}
.badge.gray{background:#f1f4f8;color:var(--ink-2)}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 14px;font-size:13px;
  cursor:pointer;color:var(--ink-2);font-weight:600;transition:.16s}
.chip.on{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;border-color:transparent}
.empty{text-align:center;color:var(--ink-3);padding:44px 10px}

/* ---------- 首页 ---------- */
.hero{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.mode{position:relative;overflow:hidden;cursor:pointer;border:1px solid var(--line);border-radius:20px;
  background:#fff;padding:20px;box-shadow:var(--shadow);transition:.2s}
.mode:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:#d9e3f3}
.mode .ic{width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  font-size:21px;margin-bottom:10px;background:linear-gradient(135deg,#eaf1ff,#e5e0ff)}
.mode b{font-size:17px;display:block;margin-bottom:3px}
.mode p{margin:0;color:var(--ink-2);font-size:13px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px}
.stat b{font-size:20px;display:block;line-height:1.35}
.stat span{font-size:12px;color:var(--ink-3)}

/* ---------- 试卷列表 ---------- */
.paper{display:flex;align-items:center;gap:12px;padding:12px 0;border-top:1px dashed var(--line);flex-wrap:wrap}
.paper:first-of-type{border-top:0}
.paper .t{flex:1;min-width:190px}
.paper .t b{font-size:15px}
.paper .tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:5px}
.yearbar{display:flex;align-items:center;gap:10px;margin:0 0 6px}
.yearbar:before{content:"";width:4px;height:15px;border-radius:3px;background:linear-gradient(180deg,var(--primary),var(--primary-2))}
.yearbar b{font-size:15.5px}

/* ---------- 题目 ---------- */
.q{border-top:1px dashed var(--line);padding:13px 0}
.q:first-of-type{border-top:0}
.q .stem{font-weight:600;line-height:1.8}
.q .num{display:inline-flex;align-items:center;justify-content:center;min-width:24px;height:24px;padding:0 6px;
  border-radius:8px;background:#eef2f8;color:var(--ink-2);font-weight:700;font-size:12.5px;margin-right:8px}
.opts{margin-top:11px;display:flex;flex-direction:column;gap:9px}
.opt{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);background:#fff;border-radius:13px;
  padding:12px 14px;cursor:pointer;transition:.16s;text-align:left;font:inherit;color:inherit}
.opt:hover{border-color:#cfd9e6;background:#fbfcff}
.opt .k{width:25px;height:25px;border-radius:9px;background:#f1f4f9;color:var(--ink-2);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex:0 0 auto}
.opt.sel{border-color:#c9daff;background:#f5f9ff}
.opt.sel .k{background:var(--primary);color:#fff}
.opt.right{border-color:#a9e3c1;background:var(--ok-bg)}
.opt.right .k{background:var(--ok);color:#fff}
.opt.wrong{border-color:#f5b5b7;background:var(--bad-bg)}
.opt.wrong .k{background:var(--bad);color:#fff}
.opt.locked{cursor:default}
.opt.locked:hover{transform:none;border-color:var(--line);background:#fff}
.ansline{margin-top:9px;font-size:13.5px}
.ansline .r{color:var(--ok);font-weight:700}
.ansline .w{color:var(--bad);font-weight:700}
.orig{margin-top:10px;border-radius:13px;padding:12px 14px;border:1px solid #d7e4ff;background:#f5f9ff;
  font-size:13.5px;line-height:1.8;color:#2b3a4d;max-height:340px;overflow:auto}
.mark{display:flex;gap:8px;margin-top:9px;align-items:center;flex-wrap:wrap}
.mark button{border:1px solid var(--line);background:#fff;border-radius:10px;padding:6px 12px;font-size:13px;font-weight:600}
.mark button.on-ok{background:var(--ok-bg);border-color:#a9e3c1;color:var(--ok)}
.mark button.on-bad{background:var(--bad-bg);border-color:#f5b5b7;color:var(--bad)}
select,input[type=text]{font:inherit;border:1px solid var(--line);border-radius:11px;padding:9px 11px;background:#fff;color:var(--ink)}
select:focus,input[type=text]:focus{outline:2px solid #dbe6ff;border-color:#c9daff}
.selrow{display:flex;gap:8px;align-items:center;margin-top:9px;flex-wrap:wrap}

/* ---------- 音频 ---------- */
.audiobox{display:flex;align-items:center;gap:12px;border:1px solid var(--line);background:#fbfcff;
  border-radius:14px;padding:12px 14px;margin:6px 0 12px;flex-wrap:wrap}
.audiobox audio{flex:1;min-width:220px;height:38px}
.audiobox .lbl{font-weight:700;font-size:13.5px;color:#2c56c9}

/* ---------- 单词 ---------- */
.quizhead{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.quizword{font-size:38px;font-weight:800;letter-spacing:.5px;text-align:center;margin-top:10px;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.quizph{text-align:center;color:var(--ink-3);margin-bottom:16px;font-size:14px}
.chs{display:flex;flex-direction:column;gap:10px}
.chs .c{border:1px solid var(--line);background:#fff;border-radius:13px;padding:13px 15px;cursor:pointer;
  font:inherit;color:inherit;text-align:left;transition:.16s}
.chs .c:hover{border-color:#cfd9e6;background:#fbfcff}
.chs .c .kk{display:inline-flex;width:22px;height:22px;border-radius:7px;background:#f1f4f9;color:var(--ink-2);
  align-items:center;justify-content:center;font-weight:700;font-size:12.5px;margin-right:9px}
.chs .c.right{border-color:#a9e3c1;background:var(--ok-bg)}
.chs .c.wrong{border-color:#f5b5b7;background:var(--bad-bg)}

/* ---------- 单词本 ---------- */
.witem{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;border:1px solid var(--line);
  border-radius:14px;padding:14px 16px;background:#fff;margin-bottom:10px}
.witem .w{font-size:20px;font-weight:800}
.witem .ph{color:var(--ink-3);font-size:13px;margin-left:6px}
.witem .cn{margin-top:3px;font-size:14px}
.witem .ex{margin-top:7px;font-size:13px;color:#475569;border-left:3px solid #dbe6ff;padding-left:9px}
.witem .excn{font-size:12.5px;color:var(--ink-3)}

/* ---------- 进度 / 答题卡 ---------- */
.progress{height:6px;background:#e9eef6;border-radius:999px;overflow:hidden;margin:10px 0;flex:1;min-width:120px}
.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-2));
  border-radius:999px;transition:width .25s}
.navrow{display:flex;align-items:center;gap:10px;margin-top:16px;flex-wrap:wrap}

/* ---------- 提示 ---------- */
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:26px;z-index:60;background:#1b2430;color:#fff;
  padding:11px 20px;border-radius:999px;font-size:13.5px;box-shadow:0 12px 30px rgba(27,36,48,.28);
  opacity:0;pointer-events:none;transition:.25s;max-width:90vw;text-align:center}
.toast.show{opacity:.97;bottom:32px}
.hide{display:none !important}

/* ---------- 移动端 ---------- */
@media (max-width:720px){
  .wrap{padding:14px 12px 84px}
  h1{font-size:20px}
  .topbar-in{padding:10px 12px;gap:8px}
  .brand{font-size:15px}
  .brand small{display:none}
  .spacer{display:none}
  .tabs{order:3;width:100%;justify-content:flex-start;padding:3px}
  .tabs button{padding:8px 12px;font-size:13px}
  .hero{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .card{padding:14px;border-radius:14px}
  .quizword{font-size:32px}
  .opt{padding:11px 12px}
  .btn{padding:10px 16px}
  .paper{align-items:flex-start}
  .paper .t{min-width:100%}
  .paper .row{width:100%}
  .paper .row .btn{flex:1}
  .audiobox audio{min-width:100%}
  .witem{flex-direction:column}
  .witem .btn{align-self:flex-end}
}

/* ---------- 打卡日历 ---------- */
.ck-card{background:linear-gradient(150deg,#eef4ff 0%,#f7f2ff 60%,#fff 100%);border-color:#dbe6ff}
.ck-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.ck-hi{font-size:17px;font-weight:800;line-height:1.5;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.ck-sub{font-size:12.5px;color:var(--ink-2);margin-top:2px}
.ck-head .btn{margin-left:auto}
.cal{background:#fff;border:1px solid var(--line);border-radius:15px;padding:13px 12px}
.cal-wk,.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:7px}
.cal-wk span{text-align:center;font-size:11.5px;color:var(--ink-3);font-weight:700;padding-bottom:5px}
.cal-grid span.ckd{display:flex;align-items:center;justify-content:center;height:38px}
.cal-grid span.ckd i{width:28px;height:28px;border-radius:50%;border:2px solid #dbe1e8;background:#fff;
  display:flex;align-items:center;justify-content:center;font-style:normal;font-size:12px;font-weight:700;
  color:var(--ink-2);transition:.16s}
.cal-grid span.ckd.done i{border-color:#8fd9ac;background:#cdf1dc;color:#0d7a3c}
.cal-grid span.ckd.today i{border-color:var(--primary);color:var(--primary);box-shadow:0 0 0 3px #e8efff}
.cal-grid span.ckd.today.done i{border-color:var(--primary);background:#cdf1dc;color:#0d7a3c;box-shadow:0 0 0 3px #e8efff}
.cal-grid span.ckd.future i{border-style:dashed;opacity:.5;color:var(--ink-3)}
.cal-grid span.ckd.click i{cursor:pointer}
.cal-grid span.ckd.click:hover i{transform:scale(1.1);border-color:var(--primary)}
.ck-foot{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:10px;
  font-size:12.5px;color:var(--ink-2)}
.ck-foot b{color:var(--primary)}

/* ---------- 解析 / 原文标红 ---------- */
.explain{margin-top:11px;border-radius:13px;padding:12px 14px;background:#fffdf5;border:1px solid #f1e7c9;
  font-size:13.5px;line-height:1.85}
.explain .hd{font-weight:800;font-size:13px;color:#8a6a12;margin-bottom:5px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.explain .why{color:#3f4a58}
.explain .keys{margin-top:9px;border-top:1px dashed #f1e7c9;padding-top:8px}
.explain .keys>b{font-size:12.5px;color:#8a6a12}
.explain .kq{margin-top:5px;border-left:3px solid #e8a3a0;background:#fdeeee;border-radius:0 9px 9px 0;
  padding:6px 10px;font-size:13px;color:#a0332f;line-height:1.7}
.orig mark.k,mark.k{background:#fdecec;color:#c0392b;border-bottom:2px solid #f0a6a1;font-weight:700;
  border-radius:3px;padding:0 3px}

/* ---------- 模拟训练 ---------- */
.tkn{border-radius:14px;padding:12px 14px;border:1px dashed #b9cdf5;background:#f4f8ff;
  font-size:13px;color:#2b3a4d;line-height:1.85;margin-top:10px}
.drillcard{display:flex;align-items:center;gap:12px;justify-content:space-between;flex-wrap:wrap}
.tynav{display:flex;gap:8px;flex-wrap:wrap}
.tynav .chip{font-size:12.5px;padding:6px 12px}
.sec-flag{display:inline-flex;align-items:center;gap:6px;margin-left:auto}
.badge.tag-real{background:#eaf1ff;color:#2c56c9}
.badge.tag-mock{background:#f1f4f8;color:var(--ink-2)}