:root{
  --bg:#FBF3E4; --card:#fff; --ink:#24303C; --sub:#77828E;
  --pri:#2E6BE6; --pri-d:#1E55C4;
  --acc:#F59E0B; --ok:#1E9E5A; --bad:#D64541; --line:#E7DFCE;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
 font-family:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
 font-size:20px;line-height:1.6;user-select:none;-webkit-user-select:none}
#app{max-width:560px;margin:0 auto;min-height:100vh;padding:14px 16px 56px}
button{font:inherit;border:none;background:none;cursor:pointer;border-radius:14px}
/* 首页 */
.home-head{text-align:center;padding:18px 0 6px}
.greet{color:var(--sub);font-size:.9em}
.app-title{margin:4px 0 0;font-size:34px;letter-spacing:2px;color:var(--pri-d)}
.app-sub{margin:2px 0 0;color:var(--sub);font-size:.85em}
.card-grid{display:flex;flex-direction:column;gap:14px;margin-top:18px}
.card-btn{display:flex;align-items:center;gap:14px;width:100%;background:var(--card);
 border:2px solid var(--line);border-radius:20px;padding:14px 16px;text-align:left;
 box-shadow:0 2px 6px rgba(120,90,30,.08);transition:transform .08s}
.card-btn:active{transform:scale(.98)}
.cb-icon{font-size:38px;width:52px;text-align:center;flex:none}
.cb-body{flex:1;min-width:0}
.cb-title{font-weight:700;font-size:21px}
.cb-no{display:inline-block;background:var(--pri);color:#fff;font-size:12px;font-weight:700;
 border-radius:999px;padding:2px 10px;margin-right:8px;vertical-align:2px}
.cb-desc{color:var(--sub);font-size:.85em;margin-top:2px}
.cb-stars{font-size:16px;letter-spacing:1px;flex:none}
.btn-row{display:flex;gap:12px;margin-top:20px;flex-wrap:wrap}
.btn{flex:1;min-width:0;background:var(--pri);color:#fff;font-weight:700;padding:15px 10px;
 border-radius:16px;text-align:center;font-size:20px;box-shadow:0 3px 0 var(--pri-d)}
.btn:active{transform:translateY(2px);box-shadow:0 1px 0 var(--pri-d)}
.btn.ghost{background:var(--card);color:var(--ink);border:2px solid var(--line);box-shadow:none}
.foot{text-align:center;color:var(--sub);font-size:.85em;margin-top:18px}
/* 顶栏 */
.topbar{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.back{font-size:32px;line-height:1;width:46px;height:46px;background:var(--card);border:2px solid var(--line);border-radius:14px;flex:none}
.back.ph{visibility:hidden}
.top-title{flex:1;text-align:center;font-weight:700;font-size:21px}
/* 进度 */
.progress{display:flex;align-items:center;gap:10px;margin:6px 0 14px}
.bar{flex:1;height:12px;background:#EADFC8;border-radius:999px;overflow:hidden}
.fill{height:100%;background:var(--acc);border-radius:999px;transition:width .3s}
.bar-txt{color:var(--sub);font-size:.8em;flex:none}
/* 卡片与题目 */
.card{background:var(--card);border:2px solid var(--line);border-radius:20px;padding:16px;box-shadow:0 2px 6px rgba(120,90,30,.08)}
.q-card{margin-bottom:14px}
.q-text{font-size:22px;font-weight:700;line-height:1.55}
.q-hint{color:var(--sub);margin-top:6px;font-size:.9em}
.read-btn{margin-top:10px;background:#FFF3D6;color:#9A6B00;font-weight:700;padding:8px 16px;border-radius:12px;font-size:17px}
/* 选项 */
.opts{display:flex;flex-direction:column;gap:12px}
.opt{display:flex;align-items:center;gap:12px;width:100%;background:var(--card);
 border:2px solid var(--line);border-radius:16px;padding:14px;text-align:left;font-size:19px;line-height:1.5;transition:background .15s,border-color .15s}
.opt-key{flex:none;width:34px;height:34px;border-radius:50%;background:#F1EADA;color:var(--ink);
 font-weight:700;display:flex;align-items:center;justify-content:center;font-size:16px}
.opt.correct{border-color:var(--ok);background:#EAF7EF}
.opt.correct .opt-key{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:#FDECEB}
.opt.wrong .opt-key{background:var(--bad);color:#fff}
.opt.dim{opacity:.55}
/* 讲解 */
.explain{margin-top:16px;background:#FFF8E3;border-left:6px solid var(--acc);
 border-radius:0 14px 14px 0;padding:12px 14px;font-size:18px}
.ex-title{font-weight:700;margin-bottom:4px}
/* 排序 */
.placed{margin-top:6px;min-height:64px;border:2px dashed #D8CBAD;border-radius:16px;padding:10px;display:flex;flex-direction:column;gap:8px;background:#FDFAF1}
.placed-empty{color:#A99C80;text-align:center;padding:14px 0;font-size:17px}
.chip{display:flex;align-items:center;gap:10px;background:var(--ok);color:#fff;
 border-radius:12px;padding:10px 12px;font-size:18px;animation:pop .25s}
.chip-no{flex:none;width:28px;height:28px;border-radius:50%;background:rgba(255,255,255,.25);
 display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px}
.pool{margin-top:14px;display:flex;flex-direction:column;gap:10px}
.stepbtn{width:100%;background:var(--card);border:2px solid var(--line);border-radius:14px;
 padding:13px 14px;text-align:left;font-size:18px}
.stepbtn.used{opacity:.35;pointer-events:none}
.hint{text-align:center;color:var(--bad);font-weight:700;min-height:26px;margin-top:10px;font-size:18px}
.shake{animation:shake .4s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
@keyframes pop{from{transform:scale(.85);opacity:0}to{transform:scale(1);opacity:1}}
/* 结果 */
.result{text-align:center;padding:28px 18px}
.res-icon{font-size:64px}
.tada{animation:tada 1s ease}
@keyframes tada{0%{transform:scale(1)}10%,20%{transform:scale(.9) rotate(-4deg)}30%,50%,70%{transform:scale(1.15) rotate(4deg)}40%,60%{transform:scale(1.15) rotate(-4deg)}80%{transform:scale(1.05)}100%{transform:scale(1)}}
.res-title{font-size:28px;font-weight:800;margin-top:10px}
.res-sub{color:var(--sub);margin-top:2px}
.res-stars{font-size:34px;letter-spacing:4px;margin-top:8px}
.res-score{color:var(--sub);margin-top:6px}
.hw{margin-top:16px;background:#EAF3FF;border-radius:14px;padding:12px;font-size:18px;text-align:left;color:#1E55C4}
.cert-rows{margin-top:16px;display:flex;flex-direction:column;gap:8px;text-align:left}
.cert-row{display:flex;justify-content:space-between;align-items:center;background:#F8F3E7;border-radius:12px;padding:10px 14px;font-size:18px}
.rules{margin-top:16px;text-align:left;background:#F8F3E7;border-radius:14px;padding:12px 16px}
.rules-title{font-weight:700;margin-bottom:6px}
.rules ul{margin:0;padding:0;list-style:none}
.rules li{padding:5px 0;font-size:18px}
.off{color:#D8CBAD}
/* 弹窗 */
.modal-overlay{position:fixed;inset:0;background:rgba(30,30,30,.5);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal-card{background:var(--card);border-radius:20px;padding:22px;width:100%;max-width:460px;animation:pop .2s}
.modal-card h3{margin:0 0 14px;text-align:center}
.set-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.seg{display:flex;border:2px solid var(--line);border-radius:12px;overflow:hidden}
.seg button{padding:8px 18px;font-size:18px;font-weight:700}
.seg button.on{background:var(--pri);color:#fff}
.sw{min-width:72px;padding:8px 0;font-weight:700;border:2px solid var(--line);border-radius:12px}
.sw.on{background:var(--ok);border-color:var(--ok);color:#fff}
/* 大字模式 */
body.big{font-size:23px}
body.big .q-text{font-size:25px}
body.big .opt{font-size:21px}
body.big .app-title{font-size:38px}

/* ???? */
.home-top{display:flex;justify-content:flex-end;padding:2px 0}
.globe{background:var(--card);border:2px solid var(--line);border-radius:999px;padding:6px 16px;font-weight:700;font-size:16px}
/* ???? */
.banner{margin-top:14px;background:#EAF3FF;border:2px solid #BBD6F7;border-radius:16px;padding:12px 14px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.b-txt{flex:1;min-width:180px;font-weight:700}
.b-btn{background:var(--pri);color:#fff;border-radius:12px;padding:8px 16px;font-weight:700;flex:none}
.b-x{font-size:20px;color:var(--sub);flex:none;padding:0 4px}
.hw-t{font-weight:700;margin-bottom:4px}
.up-note{margin:6px 0 14px}
.up-status{margin:10px 0 0;color:var(--sub);font-size:.85em}