:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1f2733;
  --muted: #6b7686;
  --line: #e6eaf2;
  --primary: #2563eb;
  --primary-d: #1d4ed8;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #d97706;
  --shadow: 0 1px 3px rgba(16,24,40,.06), 0 8px 24px rgba(16,24,40,.06);
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
  "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--ink); -webkit-text-size-adjust: 100%;
}
a { color: var(--primary); text-decoration: none; }

/* 顶栏 */
.topbar {
  display: flex; align-items: center; gap: 18px; padding: 0 20px; height: 58px;
  background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20;
}
.brand { font-weight: 700; font-size: 17px; }
.nav { display: flex; gap: 4px; }
.nav a { padding: 8px 14px; border-radius: 8px; color: var(--muted); font-size: 14px; font-weight: 600; }
.nav a.active { background: #eef3ff; color: var(--primary); }
.meeting-picker { margin-left: auto; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.meeting-picker select { padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; background: #fff; }
.net-status { font-size: 14px; }
.net-status.online { color: var(--green); }
.net-status.offline { color: var(--red); }

.view { max-width: 1080px; margin: 0 auto; padding: 24px 20px 60px; }
.view.full { max-width: none; }

/* 卡片 */
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; box-shadow: var(--shadow); }
.card + .card { margin-top: 18px; }
.card h3 { margin: 0 0 14px; font-size: 16px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 16px; border: 1px solid var(--line);
  background: #fff; border-radius: 9px; font-size: 14px; font-weight: 600; cursor: pointer; color: var(--ink); }
.btn:hover { border-color: #c7d0e0; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-d); }
.btn.danger { color: var(--red); border-color: #f3c6c6; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* 表单 */
label.field { display: block; margin-bottom: 12px; font-size: 13px; color: var(--muted); }
input, textarea, select.field {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 14px; margin-top: 5px; background: #fff; color: var(--ink);
}
input:focus, textarea:focus, select:focus { outline: 2px solid #cfe0ff; border-color: var(--primary); }

/* 统计卡 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; box-shadow: var(--shadow); }
.stat .v { font-size: 28px; font-weight: 800; }
.stat .k { font-size: 13px; color: var(--muted); margin-top: 2px; }
.stat.green .v { color: var(--green); }
.stat.amber .v { color: var(--amber); }

/* 会议列表 */
.meeting { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border: 1px solid var(--line);
  border-radius: 12px; margin-bottom: 10px; background: #fff; }
.meeting.active { border-color: var(--primary); box-shadow: 0 0 0 2px #dbe7ff; }
.meeting .info { flex: 1; }
.meeting .title { font-weight: 700; }
.meeting .meta { font-size: 12px; color: var(--muted); margin-top: 3px; }
.badge { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 999px; background: #eef3ff; color: var(--primary); margin-left: 6px; }
.badge.archived { background: #f1f3f7; color: var(--muted); }

/* 表格 */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
.tag { font-size: 12px; padding: 2px 8px; border-radius: 999px; }
.tag.late { background: #fdecec; color: var(--red); }
.tag.ok { background: #e8f6ee; color: var(--green); }

/* 大屏 */
.screen-wrap { display: grid; grid-template-columns: 420px 1fr; gap: 24px; align-items: start; }
.qr-box { text-align: center; }
.qr-canvas { background: #fff; padding: 16px; border-radius: 16px; display: inline-block; box-shadow: var(--shadow); }
#qrImg { min-width: 240px; min-height: 240px; }
#qrImg svg { display: block; max-width: 100%; height: auto; }
.qr-meta { margin-top: 12px; font-size: 13px; color: var(--muted); }
.pulse { display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--green);
  margin-right: 6px; box-shadow: 0 0 0 0 rgba(22,163,74,.5); animation: pulse 1.6s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(22,163,74,.5);} 70% { box-shadow: 0 0 0 12px rgba(22,163,74,0);} 100% { box-shadow: 0 0 0 0 rgba(22,163,74,0);} }
.feed { max-height: 70vh; overflow: auto; }
.feed-item { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.feed-item .avatar { width: 40px; height: 40px; border-radius: 50%; background: #dbe7ff; color: var(--primary);
  display: flex; align-items: center; justify-content: center; font-weight: 700; }
.feed-item .nm { font-weight: 600; }
.feed-item .tm { font-size: 12px; color: var(--muted); }
.feed-item.late .nm::after { content: " 迟到"; color: var(--red); font-size: 12px; font-weight: 600; }

/* 签到页 */
.checkin-wrap { max-width: 460px; margin: 30px auto; }
.result { text-align: center; padding: 30px 10px; }
.result .big { font-size: 40px; }
.result.ok .title { color: var(--green); }
.result.err .title { color: var(--red); }
.seg { display: flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin-bottom: 16px; }
.seg button { flex: 1; padding: 10px; border: 0; background: #fff; font-weight: 600; cursor: pointer; color: var(--muted); }
.seg button.on { background: var(--primary); color: #fff; }

/* 告警 */
.alert { border: 1px solid #f3c6c6; background: #fff5f5; border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.alert .at { font-size: 12px; color: var(--muted); }

/* Toast */
.toast { position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%) translateY(20px);
  background: #1f2733; color: #fff; padding: 12px 20px; border-radius: 10px; font-size: 14px; opacity: 0;
  transition: .25s; pointer-events: none; z-index: 99; max-width: 90vw; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.mt { margin-top: 14px; } .mb { margin-bottom: 14px; }
.hidden { display: none !important; }
.center { text-align: center; }
.tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.tabs button { padding: 8px 14px; border: 1px solid var(--line); background: #fff; border-radius: 8px; cursor: pointer; font-weight: 600; color: var(--muted); }
.tabs button.on { background: var(--primary); color: #fff; border-color: var(--primary); }

@media (max-width: 760px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .screen-wrap { grid-template-columns: 1fr; }
  .nav a { padding: 8px 10px; font-size: 13px; }
  .meeting-picker { display: none; }
}