:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1f2430;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --ok: #16a34a;
  --ok-bg: #ecfdf3;
  --warn: #b45309;
  --warn-bg: #fffbeb;
  --danger: #dc2626;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(16,24,40,.08), 0 10px 24px rgba(16,24,40,.06);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Noto Sans Thai", Tahoma, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 880px; margin: 0 auto; padding: 24px 16px 64px; }
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 20px;
}
.topbar h1 { font-size: 20px; margin: 0; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px; margin-bottom: 18px;
}
h1, h2 { line-height: 1.25; }
h2 { font-size: 18px; margin: 0 0 14px; }
label { display: block; font-weight: 600; font-size: 14px; margin: 14px 0 6px; }
input[type=text], input[type=tel], input[type=number], input[type=password] {
  width: 100%; padding: 11px 13px; font-size: 16px;
  border: 1px solid var(--line); border-radius: 10px; background: #fff;
}
input:focus { outline: 2px solid var(--brand); border-color: var(--brand); }
.hint { color: var(--muted); font-size: 13px; margin-top: 4px; }
.btn {
  display: inline-block; cursor: pointer; border: none;
  background: var(--brand); color: #fff; font-weight: 600; font-size: 15px;
  padding: 11px 18px; border-radius: 10px; text-align: center;
}
.btn:hover { background: var(--brand-dark); text-decoration: none; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.secondary { background: #eef2ff; color: var(--brand-dark); }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn.sm { padding: 7px 12px; font-size: 13px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.notice {
  border-radius: 12px; padding: 14px 16px; font-size: 14px; margin: 8px 0 4px;
  background: #eff6ff; border: 1px solid #bfdbfe; color: #1e3a8a;
}
.notice.warn { background: var(--warn-bg); border-color: #fde68a; color: var(--warn); }
.pill { font-size: 12px; padding: 3px 9px; border-radius: 999px; font-weight: 600; }
.pill.on { background: var(--ok-bg); color: var(--ok); }
.pill.off { background: #f3f4f6; color: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
.muted { color: var(--muted); }
.checkbox-row { display: flex; align-items: flex-start; gap: 10px; margin-top: 14px; }
.checkbox-row input { margin-top: 3px; width: 18px; height: 18px; }
.status { font-size: 14px; padding: 10px 12px; border-radius: 10px; margin: 10px 0; }
.status.loading { background: #f3f4f6; color: var(--muted); }
.status.good { background: var(--ok-bg); color: var(--ok); }
.status.bad { background: #fef2f2; color: var(--danger); }
.center { text-align: center; }
.big-icon { font-size: 52px; line-height: 1; margin-bottom: 8px; }

/* Projector display */
.display { text-align: center; padding-top: 10px; }
.display h1 { font-size: 30px; margin: 4px 0; }
.qr-box { background: #fff; display: inline-block; padding: 18px; border-radius: 18px; box-shadow: var(--shadow); margin: 18px 0; }
.qr-box img { width: min(62vw, 440px); height: auto; display: block; }
.countdown { font-size: 16px; color: var(--muted); }
.code-chip { font-size: 22px; letter-spacing: .12em; font-weight: 700; background:#111827; color:#fff; padding:6px 16px; border-radius:10px; display:inline-block; }

/* Dashboard session card with inline QR */
.session-card { display: flex; gap: 28px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.session-info { flex: 1 1 280px; min-width: 260px; }
.session-qr { flex: 0 0 auto; text-align: center; margin: 0 auto; }
.qr-title { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.qr-link { display: inline-block; border: 1px solid var(--line); border-radius: 16px; padding: 14px; background: #fff; transition: box-shadow .15s, transform .15s; }
.qr-link:hover { box-shadow: var(--shadow); transform: translateY(-1px); }
.qr-img { width: 210px; height: 210px; display: block; }
.qr-hint { margin-top: 12px; font-size: 12.5px; color: var(--muted); line-height: 1.6; }

/* Branded kiosk (logo + title + clock + เช็คชื่อเข้าเรียน + QR) */
.admin-bar { display: flex; gap: 10px; justify-content: flex-end; margin-bottom: 14px; }
.kiosk { background:#fff; border-radius:14px; box-shadow: var(--shadow); margin: 0 auto; padding: 36px 24px 56px; text-align: center; }
.kiosk-logo { width: 150px; height: auto; display: block; margin: 4px auto 12px; }
.kiosk-title { font-size: 17px; font-weight: 700; color: var(--ink); line-height: 1.4; }
.kiosk-time { font-size: 14px; color: var(--muted); margin-top: 4px; font-variant-numeric: tabular-nums; }
.kiosk-hr { border: none; border-top: 1px solid var(--line); margin: 16px 0; }
.kiosk-checkin { display: block; font-size: 20px; font-weight: 700; color: var(--brand); margin-bottom: 16px; text-decoration: none; }
.kiosk-checkin:hover { text-decoration: underline; }
.qr-link.bare { border: none; padding: 0; background: transparent; box-shadow: none; }
.qr-link.bare:hover { transform: none; }
.qr-img { margin-left: auto; margin-right: auto; }
.qr-img.big { width: 300px; height: 300px; }
.kiosk-meta { margin-top: 16px; font-size: 12.5px; color: var(--muted); }
.kiosk-admin { justify-content: center; margin-top: 14px; }