:root {
  --color-accent: #046a4b;
  --color-accent-hover: #03563c;
  --color-accent-light: rgba(4,106,75,0.06);
  --color-accent-border: rgba(4,106,75,0.2);
  --color-bg: #f5e6c8;
  --color-bg-alt: #faf3e6;
  --color-bg-card: #ffffff;
  --color-text: #1e1e1e;
  --color-text-secondary: #555555;
  --color-text-muted: #888888;
  --color-border: #e8e5e0;
  --color-border-light: #f0ede8;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Open Sans', -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: #f5e6c8;
  color: var(--color-text);
  min-height: 100vh;
}

/* Booking header */
.booking-header {
  background: #faf3e6;
  border-bottom: 1px solid var(--color-border-light);
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.booking-header .logo-img {
  height: 56px;
  width: auto;
}
.booking-header .brand-text {
  font-family: 'Nunito', sans-serif;
  font-size: 20px;
  font-weight: 800;
  color: var(--color-accent);
}

/* Flow header */
.flow-header {
  text-align: center;
  padding: 32px 16px 20px;
  background: #faf3e6;
}
.flow-header h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}
.flow-header .flow-badge {
  display: inline-block;
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
}
.flow-badge.chuyen-sau-khong-thu-phi { background: var(--color-accent-light); color: var(--color-accent); }
.flow-badge.chuyen-sau-chi-tiet { background: var(--color-accent-light); color: var(--color-accent); font-weight: 700; }

.flow-desc {
  text-align: center;
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0 auto 8px;
  padding: 8px 24px;
  max-width: 640px;
  line-height: 1.6;
  background: #faf3e6;
}


.container { max-width: 720px; margin: 0 auto; padding: 0 16px; }

/* Access denied */
.access-denied {
  text-align: center;
  padding: 60px 20px;
  background: #faf3e6;
  border-radius: 12px;
  max-width: 640px;
  margin: 20px auto;
}
.access-denied h2 { font-size: 20px; margin-bottom: 12px; color: #C8372D; }
.access-denied a { color: var(--color-accent); }

/* Month calendar */
.month-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 20px 0 12px;
}
.month-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}
.month-nav-btn {
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg-card);
  cursor: pointer;
  font-size: 16px;
  color: var(--color-text);
  transition: border-color 0.2s;
}
.month-nav-btn:hover { border-color: var(--color-accent); }

.month-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.cal-header {
  padding: 6px 0;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.cal-empty {
  min-height: 64px;
  background: var(--color-bg-alt);
  border-radius: 8px;
}

.date-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 2px;
  min-height: 64px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg-card);
  cursor: pointer;
  transition: all 0.2s;
}
.date-item:hover { border-color: var(--color-accent-border); background: var(--color-accent-light); }
.date-item.selected { border-color: var(--color-accent); background: rgba(4,106,75,0.08); }
.date-item.disabled { opacity: 0.35; cursor: not-allowed; }
.date-item.disabled:hover { background: var(--color-bg-card); border-color: var(--color-border); }
.date-item.past { opacity: 0.35; cursor: not-allowed; }
.date-item .day { font-size: 16px; font-weight: 700; color: var(--color-text); }
.date-item .slot-count {
  font-size: 10px;
  padding: 1px 8px;
  border-radius: 10px;
  background: #e4f0ea;
  color: var(--color-accent);
}
.date-item .slot-count.locked { background: var(--color-bg-alt); color: var(--color-text-muted); }

/* Slot list */
.slot-header {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin: 16px 0 12px;
}

.slot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
}

.slot-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 8px;
  border: 1.5px solid var(--color-accent-border);
  border-radius: 10px;
  background: var(--color-bg-card);
  cursor: pointer;
  transition: all 0.2s;
}
.slot-btn:hover { background: var(--color-accent-light); border-color: var(--color-accent); transform: translateY(-1px); }
.slot-btn .slot-time { font-size: 15px; font-weight: 600; color: var(--color-text); }
.slot-btn .slot-duration { font-size: 11px; color: var(--color-text-muted); }

.no-slots {
  text-align: center;
  padding: 24px;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  border-radius: 12px;
  font-size: 14px;
}

/* Booking form overlay */
.form-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}

.form-card {
  background: var(--color-bg-card);
  border-radius: 14px;
  padding: 28px 24px;
  max-width: 440px;
  width: 100%;
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.form-close {
  position: absolute;
  top: 12px; right: 16px;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-text-muted);
  line-height: 1;
}

.form-card h3 { font-size: 18px; margin-bottom: 16px; color: var(--color-text); }

.form-summary {
  background: var(--color-accent-light);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
}
.form-summary strong { color: var(--color-accent); }

.form-group { margin-bottom: 14px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 4px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.2s;
  background: var(--color-bg);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.btn-submit {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-submit:hover { opacity: 0.9; }
.btn-submit:disabled { opacity: 0.5; cursor: not-allowed; }

.form-card.success { text-align: center; }
.form-card.success h3 { color: var(--color-accent); }
.form-card.success p { margin-bottom: 8px; font-size: 14px; line-height: 1.6; }

.bank-info {
  background: var(--color-accent-light);
  border-radius: 10px;
  padding: 16px;
  margin: 16px 0;
  text-align: left;
  font-size: 14px;
  line-height: 1.8;
}
.bank-info p { margin-bottom: 2px; }
.bank-info .copy-row {
  cursor: pointer; display: flex; align-items: center; gap: 8px;
  padding: 4px 8px; border-radius: 6px; margin: 0 -8px; transition: background 0.2s;
}
.bank-info .copy-row:hover { background: rgba(4,106,75,0.08); }
.bank-info .copy-btn {
  font-size: 11px; color: var(--color-accent); font-weight: 600;
  white-space: nowrap; opacity: 0; transition: opacity 0.2s;
}
.bank-info .copy-row:hover .copy-btn { opacity: 1; }
.bank-info img { display: block; margin: 12px auto 0; max-width: 180px; }

.form-card.error h3 { color: #C8372D; }

.btn-close {
  margin-top: 16px;
  padding: 10px 32px;
  border: 1.5px solid var(--color-accent-border);
  border-radius: 8px;
  background: var(--color-bg-card);
  color: var(--color-accent);
  font-size: 14px;
  cursor: pointer;
}
.btn-close:hover { background: var(--color-accent-light); }
.btn-fb {
  display: inline-block;
  padding: 10px 28px;
  background: #1877F2;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.btn-fb:hover {
  background: #166fe5;
}

/* Loading & status */
.status-info { background: #E8F4FD; color: #0C5460; border: 1px solid #BEE5EB; }
.status-error { background: #F8D7DA; color: #721C24; border: 1px solid #F5C6CB; }
.status-success { background: #D4EDDA; color: #155724; border: 1px solid #C3E6CB; }

#loading { text-align: center; padding: 40px; color: var(--color-text-muted); }
#loading::after {
  content: '';
  display: block;
  width: 24px; height: 24px;
  margin: 12px auto;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Admin styles */
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  height: 72px;
  background: #fff;
  border-bottom: 1px solid var(--color-border-light);
}
.admin-header .logo-img { height: 56px; width: auto; }
.admin-header .brand-text { font-family: 'Nunito', sans-serif; font-size: 20px; font-weight: 800; color: var(--color-accent); }
.admin-header .brand-sub { font-size: 14px; color: var(--color-text-muted); margin-left: 4px; }

.admin-tabs {
  display: flex;
  gap: 0;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}
.admin-tab {
  flex: 1;
  padding: 12px;
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.admin-tab:hover { color: var(--color-text); }
.admin-tab.active { color: var(--color-text); border-bottom-color: var(--color-accent); }

.booking-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.booking-table th {
  text-align: left;
  padding: 10px 8px;
  background: var(--color-bg-alt);
  color: var(--color-text);
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
}
.booking-table td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: middle;
}

.status-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 500;
}
.status-badge.pending { background: #FFF3CD; color: #856404; }
.status-badge.confirmed { background: #D4EDDA; color: #155724; }
.status-badge.rejected { background: #F8D7DA; color: #721C24; }
.status-badge.locked { background: #E2E3E5; color: #383D41; }

.action-btn {
  padding: 4px 12px;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  margin-right: 4px;
}
.action-btn.confirm { background: #28A745; color: #FFF; }
.action-btn.reject { background: #DC3545; color: #FFF; }
.action-btn.delete { background: #6C757D; color: #FFF; }

.filter-bar {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  flex-wrap: wrap;
}
.filter-bar select, .filter-bar input {
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 13px;
}

/* Responsive */
@media (max-width: 480px) {
  .slot-grid { grid-template-columns: repeat(2, 1fr); }
  .flow-header h1 { font-size: 18px; }
  .date-item { min-height: 56px; padding: 6px 2px; }
  .date-item .day { font-size: 14px; }
  .cal-header { font-size: 10px; }
  .booking-header { padding: 0 16px; height: 64px; }
  .booking-header .logo-img { height: 48px; }
  .booking-header .brand-text { font-size: 18px; }
  .flow-desc { font-size: 14px; padding: 0 16px; }
  .booking-table { font-size: 12px; }
  .booking-table th, .booking-table td { padding: 6px 4px; }
}