:root{
  --primary:#1a73e8; --primary-d:#1557b0; --ok:#1eb980; --err:#e84545;
  --bg:#f2f5fa; --card:#fff; --text:#1f2733; --sub:#6b7785; --line:#e6ebf2;
}
*{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,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;}
.wrap{max-width:480px;margin:0 auto;min-height:100vh;padding:0 0 30px;}
header{background:linear-gradient(135deg,var(--primary),var(--primary-d));color:#fff;padding:20px 18px 16px;}
header h1{margin:0;font-size:18px;font-weight:700;}
header p{margin:6px 0 0;font-size:12.5px;opacity:.9;}
.card{background:var(--card);border-radius:14px;margin:14px 14px 0;padding:16px;
  box-shadow:0 2px 10px rgba(20,40,80,.06);}
label.fld{display:block;font-size:13px;color:var(--sub);margin:12px 0 6px;}
input.txt,input.dt{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 13px;
  font-size:15px;outline:none;background:#fbfcfe;}
input.txt:focus,input.dt:focus{border-color:var(--primary);background:#fff;}
.row2{display:flex;gap:10px;}
.row2>div{flex:1;}
.btn{width:100%;border:none;border-radius:12px;padding:14px;font-size:16px;font-weight:700;
  color:#fff;background:var(--primary);margin-top:14px;cursor:pointer;transition:.15s;}
.btn:active{transform:scale(.98);}
.btn:disabled{background:#a9c2ee;cursor:not-allowed;}
.btn.ghost{background:#eef2f8;color:var(--primary-d);}
.btn.sm{width:auto;padding:9px 14px;font-size:13px;margin-top:0;}
.banner{margin:14px 14px 0;border-radius:12px;padding:12px 14px;font-size:12.5px;line-height:1.6;}
.banner.demo{background:#fff7e6;border:1px solid #ffe0a3;color:#8a5a00;}
.banner.cloud{background:#e9f7ef;border:1px solid #b6e6c9;color:#1a6b3f;}
.qr-box{text-align:center;margin-top:8px;}
.qr-box img,.qr-box canvas{margin:0 auto;display:block;border:8px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.1);}
.link-box{background:#f6f8fc;border:1px dashed var(--line);border-radius:10px;padding:10px;
  font-size:12.5px;word-break:break-all;color:var(--sub);margin-top:10px;}
.sess-item{background:var(--card);border-radius:12px;padding:13px 14px;margin:10px 14px 0;
  box-shadow:0 1px 6px rgba(20,40,80,.05);}
.sess-item .t{font-weight:700;font-size:15px;}
.sess-item .m{font-size:12.5px;color:var(--sub);margin-top:4px;line-height:1.6;}
.sess-item .acts{margin-top:10px;display:flex;gap:8px;flex-wrap:wrap;}
.sess-item .acts a{font-size:12.5px;color:var(--primary);text-decoration:none;
  border:1px solid #cfe0fb;border-radius:8px;padding:6px 12px;}
.tip{font-size:11.5px;color:var(--sub);margin:14px 18px 0;line-height:1.6;}
.empty{color:var(--sub);font-size:13px;text-align:center;padding:20px 0;}
/* checkin result */
.result{margin:14px 14px 0;border-radius:14px;padding:18px;display:none;}
.result.show{display:block;}
.result.ok{background:#e9faf3;border:1px solid #bdeedd;}
.result.err{background:#fdeeee;border:1px solid #f3c9c9;}
.result h2{margin:0 0 8px;font-size:18px;}
.result.ok h2{color:var(--ok);} .result.err h2{color:var(--err);}
.meta{font-size:13px;color:var(--sub);line-height:1.8;} .meta b{color:var(--text);}
/* summary table */
table{width:100%;border-collapse:collapse;font-size:13px;margin-top:6px;}
th,td{text-align:left;padding:9px 8px;border-bottom:1px solid var(--line);}
th{color:var(--sub);font-weight:600;font-size:12px;}
.stats{display:flex;gap:10px;margin:14px 14px 0;}
.stat{flex:1;background:var(--card);border-radius:12px;padding:14px;text-align:center;
  box-shadow:0 1px 6px rgba(20,40,80,.05);}
.stat .n{font-size:24px;font-weight:800;color:var(--primary);}
.stat .l{font-size:12px;color:var(--sub);margin-top:3px;}
/* admin: location + radius chips */
.loc-set{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:10px;}
.chips{display:flex;flex-wrap:wrap;gap:8px;}
.chip{font-size:13px;padding:8px 14px;border-radius:20px;background:#eef2f8;color:var(--primary-d);
  border:1px solid transparent;cursor:pointer;user-select:none;transition:.15s;}
.chip.on{background:var(--primary);color:#fff;border-color:var(--primary);}
.chip:active{transform:scale(.96);}