/* ==============================================================================
   ClubHub - Phong cách giao diện Quản trị viên (Admin Panel)
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --admin-primary: #0F2854;
  --admin-primary-dark: #071733;
  --admin-accent: #FF6B00;
  --admin-sidebar-w: 260px;
  --admin-header-h: 68px;
  --admin-bg: #F1F5F9;
  --admin-card-bg: #FFFFFF;
  --admin-text: #1E293B;
  --admin-text-muted: #64748B;
  --admin-border: #E2E8F0;
  
  --admin-success: #10B981;
  --admin-warning: #F59E0B;
  --admin-danger: #EF4444;
  --admin-info: #0284C7;
}

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

body {
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
  background-color: var(--admin-bg);
  color: var(--admin-text);
  min-height: 100vh;
  display: flex;
}

/* Admin Layout */
.admin-sidebar {
  width: var(--admin-sidebar-w);
  background-color: var(--admin-primary);
  color: #FFFFFF;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.admin-sidebar-brand {
  height: var(--admin-header-h);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 1.25rem;
  font-weight: 800;
  color: #FFFFFF;
}

.admin-sidebar-brand span {
  color: var(--admin-accent);
}

.admin-nav {
  list-style: none;
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
  flex-grow: 1;
}

.admin-nav-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  color: #CBD5E1;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.admin-nav-item a:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: #FFFFFF;
}

.admin-nav-item.active a {
  background-color: var(--admin-accent);
  color: #FFFFFF;
  box-shadow: 0 4px 10px rgba(255, 107, 0, 0.3);
}

.admin-nav-badge {
  margin-left: auto;
  background-color: rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 12px;
}

.admin-nav-item.active .admin-nav-badge {
  background-color: #FFFFFF;
  color: var(--admin-accent);
  font-weight: 700;
}

.admin-sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-main {
  margin-left: var(--admin-sidebar-w);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.admin-header {
  height: var(--admin-header-h);
  background-color: #FFFFFF;
  border-bottom: 1px solid var(--admin-border);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

.admin-page-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--admin-primary);
}

.admin-header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.admin-user-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--admin-text);
}

.admin-content {
  padding: 32px;
  flex-grow: 1;
}

/* Stat Cards */
.stat-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background-color: var(--admin-card-bg);
  border: 1px solid var(--admin-border);
  border-radius: 14px;
  padding: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.03);
}

.stat-val {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--admin-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--admin-text-muted);
  font-weight: 600;
  margin-top: 4px;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.stat-icon.primary { background-color: #E2E8F0; color: var(--admin-primary); }
.stat-icon.success { background-color: #ECFDF5; color: var(--admin-success); }
.stat-icon.warning { background-color: #FFFBEB; color: var(--admin-warning); }
.stat-icon.danger  { background-color: #FEF2F2; color: var(--admin-danger); }
.stat-icon.accent  { background-color: #FFF2E8; color: var(--admin-accent); }

/* Table & Card Container */
.admin-card {
  background-color: var(--admin-card-bg);
  border: 1px solid var(--admin-border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 30px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.03);
}

.admin-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.admin-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--admin-primary);
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.admin-table th {
  padding: 12px 16px;
  background-color: #F8FAFC;
  border-bottom: 1px solid var(--admin-border);
  font-weight: 700;
  color: var(--admin-text-muted);
  font-size: 0.82rem;
  text-transform: uppercase;
}

.admin-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--admin-border);
  vertical-align: middle;
}

.admin-table tbody tr:hover {
  background-color: #F8FAFC;
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.form-full {
  grid-column: span 2;
}

.admin-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--admin-text);
  margin-bottom: 6px;
}

.admin-input, .admin-select, .admin-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--admin-border);
  border-radius: 8px;
  font-size: 0.92rem;
  background-color: #FFFFFF;
  color: #0F172A;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.admin-input:focus, .admin-select:focus, .admin-textarea:focus {
  background-color: #FFFFFF !important;
  color: #0F172A !important;
  border-color: var(--admin-accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(255, 107, 0, 0.15);
}

/* Image Upload Preview */
.img-preview-box {
  width: 100px;
  height: 100px;
  border-radius: 8px;
  border: 1px solid var(--admin-border);
  overflow: hidden;
  margin-top: 8px;
  background-color: #F8FAFC;
}

.img-preview-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Capacity meter */
.capacity-meter {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
}

.capacity-bar {
  flex-grow: 1;
  height: 8px;
  background-color: #E2E8F0;
  border-radius: 4px;
  overflow: hidden;
}

.capacity-fill {
  height: 100%;
  background-color: var(--admin-accent);
}

.capacity-fill.full {
  background-color: var(--admin-danger);
}

/* Buttons */
.btn-admin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}

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

.btn-admin-primary:hover {
  background-color: #E05E00;
  color: #FFFFFF;
}

.btn-admin-danger {
  background-color: var(--admin-danger);
  color: #FFFFFF;
}

.btn-admin-danger:hover {
  background-color: #DC2626;
  color: #FFFFFF;
}

.btn-admin-outline {
  border-color: var(--admin-border);
  background-color: transparent;
  color: var(--admin-text);
}

.btn-admin-outline:hover {
  background-color: #F8FAFC;
  border-color: var(--admin-text-muted);
}

.action-buttons {
  display: flex;
  gap: 6px;
}

/* Responsive */
@media (max-width: 992px) {
  .stat-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .form-grid { grid-template-columns: 1fr; }
  .form-full { grid-column: span 1; }
}

@media (max-width: 768px) {
  .admin-sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }
  .admin-sidebar.open {
    transform: translateX(0);
  }
  .admin-main {
    margin-left: 0;
  }
  .stat-cards-grid { grid-template-columns: 1fr; }
}