/* ═══════════════════════════════════════════════════════════════
   Admin Dashboard CSS — CLB Trí Tuệ Trẻ
════════════════════════════════════════════════════════════════ */

:root {
  --gold: #d4a847;
  --gold-light: #f0c96a;
  --navy: #0d1117;
  --navy-2: #161b22;
  --navy-3: #1e2736;
  --navy-4: #263146;
  --glass: rgba(255,255,255,0.05);
  --glass-border: rgba(255,255,255,0.1);
  --white: #ffffff;
  --white-80: rgba(255,255,255,0.8);
  --white-60: rgba(255,255,255,0.6);
  --white-40: rgba(255,255,255,0.4);
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 14px;
  --radius-sm: 8px;
  --transition: all 0.25s ease;
  --font: 'Outfit', 'Be Vietnam Pro', 'Segoe UI', sans-serif;
  --sidebar-w: 240px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--navy); color: var(--white); min-height: 100vh; }
input, textarea, select, button { font-family: inherit; }
a { text-decoration: none; color: inherit; }

/* ─── LOGIN ──────────────────────────────────────────────────── */
.login-overlay {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-3) 100%);
  padding: 24px;
}

.login-card {
  background: var(--navy-2);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 48px 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
}

.login-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 32px;
  color: var(--gold);
}

.login-logo .logo-icon { font-size: 28px; }

.login-card h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 28px;
  color: var(--white);
}

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--white-60);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.field input, .field textarea, .field select {
  width: 100%;
  background: var(--navy);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--white);
  font-size: 14px;
  outline: none;
  transition: var(--transition);
}
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: rgba(212,168,71,0.5);
  box-shadow: 0 0 0 3px rgba(212,168,71,0.1);
}
.field input::placeholder, .field textarea::placeholder { color: var(--white-40); }
.field textarea { resize: vertical; }
.field select { appearance: none; cursor: pointer; }
.field.full { grid-column: 1/-1; }

.btn-login {
  width: 100%;
  background: linear-gradient(135deg, #a07830, var(--gold));
  color: var(--navy);
  font-size: 15px;
  font-weight: 700;
  padding: 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  margin-top: 8px;
}
.btn-login:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(212,168,71,0.3); }

.login-error {
  color: var(--danger);
  font-size: 13px;
  text-align: center;
  margin-top: 12px;
  min-height: 20px;
}

.back-link {
  display: block;
  text-align: center;
  margin-top: 20px;
  font-size: 13px;
  color: var(--white-40);
  transition: var(--transition);
}
.back-link:hover { color: var(--gold); }

/* ─── LAYOUT ─────────────────────────────────────────────────── */
.admin-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* ─── SIDEBAR ────────────────────────────────────────────────── */
.sidebar {
  background: var(--navy-2);
  border-right: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 24px 20px;
  font-size: 16px;
  font-weight: 700;
  color: var(--gold);
  border-bottom: 1px solid var(--glass-border);
}

.logo-icon { font-size: 24px; }
.sidebar-title { font-weight: 700; }

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--white-60);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
}

.nav-item:hover { background: var(--glass); color: var(--white); }
.nav-item.active { background: rgba(212,168,71,0.12); color: var(--gold-light); font-weight: 600; }

.unread-badge {
  margin-left: auto;
  background: var(--danger);
  color: white;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 100px;
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.preview-btn {
  display: block;
  text-align: center;
  padding: 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  font-size: 13px;
  color: var(--white-60);
  transition: var(--transition);
}
.preview-btn:hover { border-color: var(--gold); color: var(--gold); }

.logout-btn {
  width: 100%;
  padding: 10px;
  border-radius: var(--radius-sm);
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.2);
  color: #f87171;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.logout-btn:hover { background: rgba(239,68,68,0.2); }

/* ─── MAIN CONTENT ───────────────────────────────────────────── */
.admin-main {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow: hidden;
}

.admin-topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 32px;
  background: var(--navy-2);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.page-title {
  font-size: 20px;
  font-weight: 700;
  flex: 1;
}

.topbar-right { display: flex; align-items: center; gap: 12px; }
.admin-user {
  font-size: 13px;
  color: var(--white-60);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 6px 14px;
  border-radius: 100px;
}

.mobile-menu-btn {
  display: none;
  font-size: 20px;
  color: var(--white);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

/* Sections */
.admin-section {
  display: none;
  padding: 32px;
  flex-direction: column;
  gap: 24px;
}
.admin-section.active { display: flex; }

.section-card {
  background: var(--navy-2);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px;
}

.card-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--white);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--glass-border);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

/* Buttons */
.btn-save {
  background: linear-gradient(135deg, #a07830, var(--gold));
  color: var(--navy);
  font-size: 14px;
  font-weight: 700;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-save:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(212,168,71,0.3); }

.btn-add {
  background: rgba(79,142,247,0.1);
  border: 1px solid rgba(79,142,247,0.25);
  color: #7eb3ff;
  font-size: 14px;
  font-weight: 600;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  margin-top: 16px;
}
.btn-add:hover { background: rgba(79,142,247,0.18); }

.btn-edit {
  background: rgba(212,168,71,0.1);
  border: 1px solid rgba(212,168,71,0.2);
  color: var(--gold);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
}
.btn-edit:hover { background: rgba(212,168,71,0.2); }

.btn-delete {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.2);
  color: #f87171;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
}
.btn-delete:hover { background: rgba(239,68,68,0.2); }

/* Items list (stats, activities, achievements, programs) */
.items-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.list-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  transition: var(--transition);
}
.list-item:hover { border-color: rgba(212,168,71,0.2); }

.list-item-icon { font-size: 24px; flex-shrink: 0; }
.list-item-info { flex: 1; min-width: 0; }
.list-item-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.list-item-desc {
  font-size: 12px;
  color: var(--white-40);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 3px;
}
.list-item-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  flex-shrink: 0;
}
.badge-active { background: rgba(34,197,94,0.1); color: #4ade80; border: 1px solid rgba(34,197,94,0.2); }
.badge-inactive { background: rgba(79,142,247,0.1); color: #7eb3ff; border: 1px solid rgba(79,142,247,0.2); }

.list-item-actions { display: flex; gap: 8px; flex-shrink: 0; }

/* Gallery admin grid */
.upload-area {
  border: 2px dashed var(--glass-border);
  border-radius: var(--radius);
  padding: 8px;
  margin-bottom: 20px;
  transition: var(--transition);
}
.upload-area.dragging { border-color: var(--gold); background: rgba(212,168,71,0.05); }

.upload-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 32px;
  cursor: pointer;
  color: var(--white-40);
}
.upload-icon { font-size: 36px; }
.upload-placeholder strong { color: var(--white-80); font-size: 15px; }
.upload-placeholder span { font-size: 13px; }
.upload-placeholder small { font-size: 11px; }

.gallery-admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

.gallery-admin-item {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 4/3;
  border: 1px solid var(--glass-border);
  group: true;
}

.gallery-admin-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.gallery-admin-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.65);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  opacity: 0;
  transition: var(--transition);
}

.gallery-admin-item:hover .gallery-admin-overlay { opacity: 1; }

.gallery-admin-caption {
  font-size: 11px;
  color: var(--white-60);
  text-align: center;
  padding: 0 8px;
}

/* Messages */
.messages-list { display: flex; flex-direction: column; gap: 12px; }

.message-item {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  transition: var(--transition);
}
.message-item.unread { border-left: 3px solid var(--gold); }

.message-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.message-name { font-weight: 600; font-size: 15px; }
.message-contact { font-size: 12px; color: var(--white-40); }
.message-date { font-size: 11px; color: var(--white-40); margin-left: auto; }
.message-body { font-size: 14px; color: var(--white-80); line-height: 1.6; }
.message-actions { display: flex; gap: 8px; margin-top: 12px; }
.message-new-badge {
  font-size: 10px; font-weight: 700; letter-spacing: 1px;
  background: var(--gold); color: var(--navy);
  padding: 2px 8px; border-radius: 100px;
}
.no-messages { text-align: center; padding: 40px; color: var(--white-40); }

/* ─── MODAL ──────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal {
  background: var(--navy-2);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--glass-border);
}
.modal-header h3 { font-size: 18px; font-weight: 700; }
.modal-close {
  font-size: 18px;
  color: var(--white-60);
  cursor: pointer;
  background: none;
  border: none;
  transition: var(--transition);
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
}
.modal-close:hover { background: var(--glass); color: var(--white); }

.modal-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  padding: 16px 24px;
  border-top: 1px solid var(--glass-border);
}

.btn-cancel {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: none;
  color: var(--white-60);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}
.btn-cancel:hover { background: var(--glass); }

/* ─── TOAST ──────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--navy-3);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--white);
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
  min-width: 240px;
  animation: toastIn 0.3s ease;
  display: flex;
  align-items: center;
  gap: 10px;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .admin-layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    top: 0; left: -100%;
    z-index: 1000;
    width: 260px;
    height: 100%;
    transition: left 0.3s ease;
  }
  .sidebar.open { left: 0; }
  .mobile-menu-btn { display: block; }
  .admin-topbar { padding: 14px 20px; }
  .admin-section { padding: 20px; }
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .field.full { grid-column: 1; }
  .gallery-admin-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
}