:root{
  --bg:#f2f5f9; --card:#fff; --main:#4a7dff; --main-d:#3563d9;
  --text:#233; --muted:#8a94a6; --ok:#2eb872; --bad:#e5534b;
  --radius:16px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html{font-size:16px}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);min-height:100vh}
.view{display:none;max-width:480px;margin:0 auto;padding:20px 16px 40px;min-height:100vh}
.view.active{display:block}
.card{background:var(--card);border-radius:var(--radius);padding:22px;
  box-shadow:0 2px 10px rgba(30,50,90,.06)}
h1{font-size:1.35rem;text-align:center;margin:18px 0}
/* 品牌区 */
.brand{text-align:center;margin:44px 0 22px}
.wordmark{font-size:2.6rem;font-weight:800;letter-spacing:1px;
  font-family:"Trebuchet MS","Segoe UI",-apple-system,sans-serif}
.wordmark .w1{color:var(--main)}
.wordmark .w2{color:#ff9f43}
.brand h1{margin:4px 0 2px;font-size:1.1rem;color:#555;letter-spacing:4px;font-weight:600}
.brand-en{color:var(--muted);font-size:.8rem;letter-spacing:.5px}
h2{font-size:1.1rem;margin-bottom:12px}
.muted{color:var(--muted);font-size:.85rem}
.center{text-align:center}
input[type=text],input[type=password]{
  width:100%;padding:14px;border:2px solid #e3e8f0;border-radius:12px;
  font-size:1.05rem;margin:8px 0;outline:none}
input:focus{border-color:var(--main)}
.btn{display:block;width:100%;padding:15px;border:none;border-radius:12px;
  background:var(--main);color:#fff;font-size:1.1rem;font-weight:600;
  margin:12px 0;cursor:pointer}
.btn:active{background:var(--main-d)}
.btn.ghost{background:#eef2fa;color:var(--main)}
.btn.big{padding:18px;font-size:1.25rem}
.btn:disabled{opacity:.5}
.err{color:var(--bad);font-size:.9rem;min-height:1.2em;margin:4px 0}
/* 宠物 */
.pet-wrap{text-align:center;margin:10px 0}
.pet-wrap video{width:78%;max-width:300px;border-radius:20px;background:#dfe7f5}
.pet-state{font-size:1.2rem;font-weight:700;margin-top:8px}
.pet-hint{color:var(--muted);margin:6px 0 2px}
.medfee{color:var(--bad);font-size:.85rem}
.stat-row{display:flex;justify-content:space-around;margin:16px 0}
.stat{text-align:center}
.stat b{display:block;font-size:1.3rem;color:var(--main)}
/* 配对 */
.cols{display:flex;gap:12px;margin-top:10px}
.col{flex:1;display:flex;flex-direction:column;gap:10px}
.tile{padding:14px 8px;border:2px solid #e3e8f0;border-radius:12px;background:#fff;
  text-align:center;font-size:1.05rem;cursor:pointer;user-select:none;min-height:52px;
  display:flex;align-items:center;justify-content:center}
.tile.sel{border-color:var(--main);background:#eaf0ff}
.tile.hit{animation:flash .5s}
@keyframes flash{0%,100%{background:#fff}50%{background:#ffd9d6;border-color:var(--bad)}}
.tile.gone{visibility:hidden}
.progress{height:8px;background:#e3e8f0;border-radius:4px;overflow:hidden;margin:12px 0}
.progress i{display:block;height:100%;background:var(--main);transition:width .3s}
/* 拼写 */
/* 单元选择卡片 */
.unit-card{display:flex;justify-content:space-between;align-items:center;
  background:#fff;border-radius:var(--radius);padding:18px 20px;margin:10px 0;
  box-shadow:0 2px 10px rgba(30,50,90,.06);cursor:pointer}
.unit-card b{font-size:1.15rem}
.unit-card .uarrow{color:#c9d2e0;font-size:1.4rem;font-weight:300}
.unit-card .uinfo{text-align:right;color:var(--muted);font-size:.85rem;line-height:1.5}
.unit-card .uinfo b{color:var(--main);font-size:1.05rem}
/* 拼写填空题干 */
.sentence{font-size:1.15rem;line-height:1.7;margin:16px 0 6px;word-break:break-word}
.sentence u{text-decoration:none;border-bottom:2px solid var(--main);
  padding:0 6px;color:var(--main);font-weight:700;letter-spacing:2px}
.meaning{font-size:1.5rem;font-weight:700;text-align:center;margin:26px 0 6px}
.fb{text-align:center;min-height:1.6em;font-weight:600}
.fb.ok{color:var(--ok)}.fb.bad{color:var(--bad)}
.answer{text-align:center;color:var(--bad);margin:6px 0}
/* 小结 */
.big-num{font-size:2.4rem;font-weight:800;color:var(--main);text-align:center}
.admin-link{display:block;text-align:center;color:#c3cad6;font-size:.75rem;
  margin-top:30px;text-decoration:none}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.topbar .who{font-size:.85rem;color:var(--muted)}
.topbar a{color:var(--muted);font-size:.85rem}

/* ICP备案页脚 */
.icp-footer{position:fixed;bottom:6px;left:0;right:0;text-align:center;font-size:.75rem;z-index:50}
.icp-footer a{color:#9aa0a6;text-decoration:none}
.icp-footer a:hover{color:#666}