:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #1d4ed8;
  --primary-dark: #1e40af;
  --danger: #dc2626;
  --success: #059669;
  --border: #d1d5db;
  --shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans TC", "Microsoft JhengHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 24px auto;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 18px;
}

h1, h2, h3 {
  margin: 0;
}

.subtitle {
  margin-top: 6px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}

.nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.nav a {
  color: var(--primary);
  background: #eff6ff;
  text-decoration: none;
  padding: 9px 12px;
  border-radius: 999px;
  font-weight: 700;
}

.row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

label {
  font-weight: 700;
}

select, input[type="text"] {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  min-width: 130px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 11px 16px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  background: var(--primary);
  color: #fff;
}

button:hover {
  background: var(--primary-dark);
}

button.secondary {
  background: #374151;
}

button.danger {
  background: var(--danger);
}

button.print {
  background: var(--success);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  border-bottom: 1px solid #e5e7eb;
  padding: 14px 12px;
  text-align: center;
}

th {
  background: #f9fafb;
  color: #374151;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 800;
  padding: 8px 10px;
  border-radius: 999px;
  background: #f3f4f6;
}

.status.ok {
  color: var(--success);
  background: #ecfdf5;
}

.status.bad {
  color: var(--danger);
  background: #fef2f2;
}

.message {
  margin-top: 12px;
  font-weight: 700;
}

.message.ok {
  color: var(--success);
}

.message.error {
  color: var(--danger);
}

.display-body {
  background: #0f172a;
  color: #f8fafc;
}

.display-hidden {
  display: none !important;
}

.display-auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
}

.display-auth-card {
  width: min(560px, 100%);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.display-auth-kicker {
  color: #93c5fd;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.display-auth-title {
  margin-top: 8px;
  font-size: clamp(32px, 4vw, 54px);
  font-weight: 900;
  line-height: 1.15;
}

.display-auth-note {
  margin-top: 12px;
  color: #cbd5e1;
  line-height: 1.7;
}

.display-auth-form {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.display-auth-input {
  width: 100%;
  min-width: 0;
  font: inherit;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.72);
  color: #f8fafc;
}

.display-auth-input::placeholder {
  color: #94a3b8;
}

.display-auth-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.display-auth-error {
  min-height: 1.25em;
  color: #fecaca;
  font-weight: 700;
}

.display-password-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.qr-modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 1000;
}

.qr-modal.open {
  display: flex;
}

.qr-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(3px);
}

.qr-modal-panel {
  position: relative;
  width: min(520px, 100%);
  max-height: min(90vh, 760px);
  overflow: auto;
  background: #ffffff;
  color: #111827;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
  padding: 24px;
}

.qr-modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.qr-modal-title {
  font-size: 1.5rem;
  font-weight: 900;
}

.qr-modal-subtitle {
  margin-top: 6px;
  color: #6b7280;
}

.qr-modal-content {
  display: grid;
  gap: 16px;
  justify-items: center;
}

.qr-modal-loading,
.qr-modal-error {
  width: 100%;
  text-align: center;
  padding: 32px 16px;
  border: 1px dashed #d1d5db;
  border-radius: 16px;
  color: #374151;
}

.qr-modal-qr {
  width: min(360px, 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 20px;
}

.qr-modal-qr svg {
  width: 100%;
  height: auto;
  display: block;
}

.qr-modal-password-label {
  color: #6b7280;
  font-weight: 700;
}

.qr-modal-url-label {
  color: #6b7280;
  font-weight: 700;
}

.qr-modal-url {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  color: #334155;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.92rem;
  word-break: break-all;
  text-align: left;
}

.qr-modal-password {
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 1000;
  letter-spacing: 0.18em;
  text-align: center;
  background: #eff6ff;
  color: #1d4ed8;
  padding: 12px 16px;
  border-radius: 16px;
  width: 100%;
}

.display-container {
  width: min(1280px, calc(100% - 48px));
  margin: 32px auto;
}

.display-top {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.display-title {
  font-size: clamp(34px, 4vw, 64px);
  font-weight: 900;
  line-height: 1.2;
}

.clock {
  text-align: right;
  font-size: clamp(2rem, 6vw, 8rem);
  font-weight: 900;
  color: #bfdbfe;
}

.date-line {
  font-size: clamp(18px, 2vw, 28px);
  color: #cbd5e1;
  margin-top: 8px;
}

.session-panel {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 24px;
  padding: 28px;
}

.session-title {
  font-size: clamp(32px, 4vw, 58px);
  font-weight: 900;
  margin-bottom: 20px;
}

.candidate-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.candidate-card {
  background: #f8fafc;
  color: #111827;
  border-radius: 22px;
  padding: 28px 20px;
  text-align: center;
}

.candidate-label {
  font-size: clamp(24px, 3vw, 42px);
  color: #475569;
  font-weight: 800;
  margin-bottom: 14px;
}

.question-display {
  font-size: clamp(48px, 7vw, 96px);
  font-weight: 1000;
  line-height: 1.1;
}

.question-display.absent {
  color: var(--danger);
}

.absent-text {
  color: var(--danger);
  font-weight: 900;
}

.footer-line {
  margin-top: 18px;
  color: #cbd5e1;
  font-size: 20px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.print-only {
  display: none;
}

@media (max-width: 760px) {
  .header, .display-top {
    flex-direction: column;
  }

  .clock {
    text-align: left;
  }

  .candidate-grid {
    grid-template-columns: 1fr;
  }
}

@media print {
  .nav, button, .no-print {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .container {
    width: 100%;
    margin: 0;
  }

  .card {
    box-shadow: none;
    border: none;
  }

  .print-only {
    display: block;
  }
}