:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --text: #152033;
  --muted: #62708a;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #dbe4f0;
  --success: #047857;
  --warning: #b45309;
  --error: #b91c1c;
  font-family:
    Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.14), transparent 30rem),
    var(--bg);
  color: var(--text);
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-weight: 700;
  padding: 0.85rem 1.1rem;
  transition:
    background 0.15s ease,
    transform 0.15s ease;
}

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

button:active {
  transform: translateY(1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.button-secondary {
  background: #eef4ff;
  color: var(--primary-dark);
}

.button-secondary:hover {
  background: #dbeafe;
}

.button-link {
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  font-size: 0.86rem;
  font-weight: 800;
  padding: 0.55rem 0.8rem;
  text-decoration: none;
}

.button-link-secondary {
  background: #eef4ff;
  color: var(--primary-dark);
}

.heading-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: flex-end;
}

.page-shell {
  width: min(980px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3rem 0;
}

.hero {
  margin-bottom: 1.5rem;
}

.eyebrow {
  margin: 0 0 0.4rem;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1;
  margin-bottom: 0.75rem;
}

h2 {
  margin-bottom: 0;
}

.hero-copy {
  color: var(--muted);
  font-size: 1.05rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.stat-card,
.panel {
  border: 1px solid var(--border);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 50px rgba(21, 32, 51, 0.08);
}

.stat-card {
  padding: 1rem;
}

.stat-label {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  margin-bottom: 0.45rem;
}

.stat-card strong {
  font-size: 1.8rem;
}

.panel {
  margin-top: 1rem;
  padding: 1.25rem;
}

.cdk-form label {
  display: block;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 0.55rem;
}

.form-row {
  display: flex;
  gap: 0.75rem;
}

.form-row input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  padding: 0.85rem 1rem;
}

.form-row input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
  outline: none;
}

.message {
  border-radius: 14px;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
}

.message.info {
  background: #eff6ff;
  color: var(--primary-dark);
}

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

.message.warning {
  background: #fffbeb;
  color: var(--warning);
}

.message.error {
  background: #fef2f2;
  color: var(--error);
}

.panel-heading {
  align-items: center;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.session-details {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 0 0 1rem;
}

.session-details div {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
}

.session-details dt {
  color: var(--muted);
  font-size: 0.86rem;
  margin-bottom: 0.4rem;
}

.session-details dd {
  font-size: 1.1rem;
  font-weight: 800;
  margin: 0;
  overflow-wrap: anywhere;
}

.inline-copy-button {
  border-radius: 999px;
  font-size: 0.78rem;
  margin-left: 0.45rem;
  padding: 0.35rem 0.6rem;
  vertical-align: middle;
}

.code-value {
  color: var(--success);
  letter-spacing: 0.06em;
}

.session-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

[hidden] {
  display: none !important;
}

@media (max-width: 800px) {
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .panel-heading,
  .form-row {
    align-items: stretch;
    flex-direction: column;
  }

  .session-details {
    grid-template-columns: 1fr;
  }
}

.admin-shell {
  width: min(1180px, calc(100% - 2rem));
}

.admin-hero {
  margin-bottom: 1rem;
}

.admin-login-panel {
  max-width: 560px;
}

.admin-stats {
  grid-template-columns: repeat(6, minmax(0, 1fr));
  margin-bottom: 0;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.admin-grid-even {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.admin-form {
  display: grid;
  gap: 0.7rem;
}

.admin-form label {
  color: var(--muted);
  font-weight: 700;
}

.admin-form input,
.admin-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  padding: 0.8rem 0.95rem;
}

.admin-form textarea {
  min-height: 8rem;
  resize: vertical;
}

.admin-form input:focus,
.admin-form textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
  outline: none;
}

.admin-table-panel {
  overflow: hidden;
}

.table-count {
  color: var(--muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

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

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}

.admin-table th,
.admin-table td {
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0.85rem;
  text-align: left;
  vertical-align: top;
}

.admin-table th {
  background: #f8fbff;
  color: var(--muted);
  font-weight: 800;
}

.admin-table td {
  overflow-wrap: anywhere;
}

.admin-table tbody tr:last-child td {
  border-bottom: 0;
}

.admin-table code {
  color: var(--primary-dark);
  font-weight: 800;
}

.empty-cell {
  color: var(--muted);
  text-align: center;
}

@media (max-width: 920px) {
  .admin-grid,
  .admin-grid-even {
    grid-template-columns: 1fr;
  }
}