:root{
  --primary:#e4393c;        /* 中国红，涨/主色 */
  --primary-dark:#c1272d;
  --bg:#f4f5f7;
  --card:#ffffff;
  --text:#1f2329;
  --muted:#8a9099;
  --line:#eceef0;
  --ok:#07c160;             /* 微信绿，成功 */
  --radius:14px;
  --shadow:0 2px 12px rgba(0,0,0,.06);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,"PingFang SC","Helvetica Neue",Arial,sans-serif;
  font-size:15px;line-height:1.6;}
#app{max-width:480px;margin:0 auto;min-height:100vh;background:var(--bg);}
.loading{padding:80px 0;text-align:center;color:var(--muted);}
a{color:var(--primary);text-decoration:none;}
img{max-width:100%;}

/* 顶部品牌条 */
.brandbar{background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;padding:14px 18px;display:flex;align-items:center;gap:10px;}
.brandbar .logo{width:34px;height:34px;border-radius:8px;background:#fff;color:var(--primary);
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;}
.brandbar .t1{font-weight:700;font-size:16px;}
.brandbar .t2{font-size:12px;opacity:.85;}

/* 海报区（通栏） */
.poster{display:block;width:100%;height:auto;margin:0;}

/* 卡片 */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:18px;margin:14px;}
.card h3{margin:0 0 12px;font-size:16px;}
.section-title{font-size:13px;color:var(--muted);margin:18px 18px 6px;font-weight:600;}

/* 表单 */
.field{margin-bottom:14px;}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px;}
.field input,.field select{width:100%;border:1px solid var(--line);border-radius:10px;
  padding:11px 12px;font-size:15px;background:#fafbfc;outline:none;}
.field input:focus,.field select:focus{border-color:var(--primary);background:#fff;}

/* 按钮 */
.btn{display:block;width:100%;border:none;border-radius:12px;padding:13px;
  font-size:16px;font-weight:700;background:var(--primary);color:#fff;cursor:pointer;}
.btn:active{background:var(--primary-dark);}
.btn.ghost{background:#fff;color:var(--primary);border:1px solid var(--primary);}
.btn.ok{background:var(--ok);}
.btn.block{margin:14px;}
.btn[disabled]{opacity:.6;}

/* 听课页 */
.live{background:#111;color:#fff;border-radius:var(--radius);margin:14px;overflow:hidden;}
.live .video-ph{aspect-ratio:16/9;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:8px;background:radial-gradient(circle at 50% 40%,#2a2a2a,#000);}
.live .video-ph .play{width:56px;height:56px;border-radius:50%;background:var(--primary);
  display:flex;align-items:center;justify-content:center;font-size:24px;}
.live .bar{display:flex;justify-content:space-between;padding:10px 14px;font-size:13px;
  background:rgba(255,255,255,.06);}
.live .bar .dot{color:var(--ok);}
.pulse{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--ok);
  margin-right:6px;animation:pulse 1.4s infinite;}
@keyframes pulse{0%{opacity:1}50%{opacity:.3}100%{opacity:1}}

/* 看板 */
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px;}
.stat{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;}
.stat .num{font-size:26px;font-weight:800;color:var(--primary);}
.stat .num.green{color:var(--ok);}
.stat .lab{font-size:12px;color:var(--muted);margin-top:4px;}

/* 列表 */
.list{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);margin:14px;overflow:hidden;}
.list .row{display:flex;justify-content:space-between;align-items:center;padding:13px 16px;border-bottom:1px solid var(--line);}
.list .row:last-child{border-bottom:none;}
.list .row .main{font-weight:600;}
.list .row .sub{font-size:12px;color:var(--muted);}
.tag{font-size:11px;padding:2px 8px;border-radius:20px;background:#fdeaea;color:var(--primary);}
.tag.green{background:#e7f8ee;color:var(--ok);}
.tag.gray{background:#f0f1f3;color:var(--muted);}

/* 底部导航 */
.tabbar{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;
  display:flex;background:#fff;border-top:1px solid var(--line);}
.tabbar a{flex:1;text-align:center;padding:9px 0;font-size:12px;color:var(--muted);}
.tabbar a.active{color:var(--primary);font-weight:700;}

/* 通用 */
.center{text-align:center;}
.muted{color:var(--muted);}
.toast{position:fixed;left:50%;top:40%;transform:translateX(-50%);background:rgba(0,0,0,.8);
  color:#fff;padding:10px 18px;border-radius:8px;font-size:14px;opacity:0;pointer-events:none;
  transition:opacity .2s;z-index:99;max-width:80%;text-align:center;}
.toast.show{opacity:1;}
.pad{padding:0 18px;}
.qr-box{text-align:center;padding:10px 0;}
.qr-box img{width:180px;height:180px;border:1px solid var(--line);border-radius:10px;}
.kv{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px dashed var(--line);}
.kv:last-child{border-bottom:none;}
.hero{padding:22px 18px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;}
.hero h1{font-size:21px;margin:0 0 10px;line-height:1.4;}
.hero p{margin:0;font-size:13px;opacity:.92;}
.feature{display:flex;gap:10px;align-items:flex-start;margin-bottom:12px;}
.feature .ic{width:30px;height:30px;border-radius:8px;background:#fdeaea;color:var(--primary);
  display:flex;align-items:center;justify-content:center;font-weight:800;flex-shrink:0;}
.divider{height:1px;background:var(--line);margin:14px 0;}
.hidden{display:none;}