:root {
  --bg: #f7f7f9;
  --card-bg: #ffffff;
  --text: #1c1c1e;
  --text-muted: #6b6b70;
  --border: #e2e2e6;
  --accent: #2f6fed;
  --accent-hover: #245bd1;
  --danger: #d64545;
  --danger-bg: #fdecec;
  --success-bg: #eaf7ee;
  --success-text: #1f7a3d;
  --badge-open-bg: #eaf7ee;
  --badge-open-text: #1f7a3d;
  --badge-booked-bg: #f0f0f2;
  --badge-booked-text: #6b6b70;
  --badge-new-bg: #fff4e0;
  --badge-new-text: #9a6400;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181c;
    --card-bg: #222329;
    --text: #f0f0f2;
    --text-muted: #9a9aa2;
    --border: #34353c;
    --accent: #5b8dfb;
    --accent-hover: #7ba0fc;
    --danger: #ef6a6a;
    --danger-bg: #3a2323;
    --success-bg: #1e3324;
    --success-text: #6cd48c;
    --badge-open-bg: #1e3324;
    --badge-open-text: #6cd48c;
    --badge-booked-bg: #2b2c33;
    --badge-booked-text: #9a9aa2;
    --badge-new-bg: #3a2f14;
    --badge-new-text: #f0b429;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.5;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.page-header {
  text-align: center;
  margin-bottom: 24px;
}

.page-header h1 {
  font-size: 1.5rem;
  margin: 0 0 4px;
}

.subtitle {
  color: var(--text-muted);
  margin: 0;
}

.hidden {
  display: none !important;
}

.form-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}

.form-card h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

form label {
  display: block;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

form input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

form input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.required {
  color: var(--danger);
}

.form-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 0.95rem;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-small {
  padding: 6px 10px;
  font-size: 0.85rem;
  background: var(--border);
  color: var(--text);
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
}

.slots-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.date-group {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.date-group h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.time-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.time-btn {
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.95rem;
}

.time-btn:hover {
  background: var(--accent);
  color: #fff;
}

.selected-slot {
  font-weight: 600;
  color: var(--accent);
}

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

.error {
  color: var(--danger);
  background: var(--danger-bg);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.9rem;
}

#success-section {
  text-align: center;
}

#success-section h2 {
  color: var(--success-text);
}

.admin-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 12px;
}

.inline-form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
}

.inline-form label {
  margin-bottom: 0;
  flex: 1 1 140px;
}

.inline-form .btn {
  height: 42px;
}

.slots-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.slots-table th,
.slots-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.slots-table tbody tr.row-new {
  background: var(--badge-new-bg);
}

.row-actions {
  display: flex;
  gap: 6px;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
}

.badge-open {
  background: var(--badge-open-bg);
  color: var(--badge-open-text);
}

.badge-booked {
  background: var(--badge-booked-bg);
  color: var(--badge-booked-text);
}

.badge-new {
  background: var(--badge-new-bg);
  color: var(--badge-new-text);
}

@media (max-width: 480px) {
  .slots-table {
    display: block;
    overflow-x: auto;
  }
}