/* ===================================================
   VietTravel Admin Panel CSS
   =================================================== */
:root {
  --sidebar-bg: #0f172a;
  --sidebar-width: 260px;
  --header-height: 64px;
  --primary: #FF6B35;
  --primary-dark: #E55A27;
  --accent: #F5A623;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  --dark: #0f172a;
  --dark2: #1e293b;
  --gray: #64748b;
  --gray-light: #94a3b8;
  --border: #e2e8f0;
  --bg: #f1f5f9;
  --white: #fff;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.12);
  --transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
  --font: 'Be Vietnam Pro', 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html.dark-theme {
  --sidebar-bg: #020617;
  --dark: #f8fafc;
  --dark2: #cbd5e1;
  --gray: #94a3b8;
  --gray-light: #475569;
  --border: #334155;
  --bg: #0f172a;
  --white: #1e293b;
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.5);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body, #__next { width: 100%; min-height: 100%; font-family: var(--font); color: var(--dark); }
body { background: var(--bg); overflow: hidden; transition: background-color 0.3s ease, color 0.3s ease; }
#__next { width: 100%; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; font-family: var(--font); outline: none; }
input, select, textarea { font-family: var(--font); outline: none; }
ul { list-style: none; }

/* SIDEBAR */
.sidebar {
  width: var(--sidebar-width); background: var(--sidebar-bg);
  height: 100vh; position: fixed; left: 0; top: 0; z-index: 100;
  display: flex; flex-direction: column; transition: var(--transition);
  overflow-y: auto; scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.1) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.sidebar-logo {
  padding: 24px 20px; display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar-logo .logo-icon {
  width: 40px; height: 40px;
  border-radius: 10px; display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.sidebar-logo .logo-icon img { width: 100%; height: 100%; object-fit: contain; }
.sidebar-logo .logo-text { font-size: 18px; font-weight: 800; color: #fff; }
.sidebar-logo .logo-sub { font-size: 11px; color: rgba(255,255,255,0.4); margin-top: 1px; }

.sidebar-nav { flex: 1; padding: 16px 12px; }
.nav-section { margin-bottom: 8px; }
.nav-section-title {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em;
  color: rgba(255,255,255,0.3); padding: 8px 12px; margin-bottom: 4px;
}
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border-radius: 10px; color: rgba(255,255,255,0.6); font-size: 14px; font-weight: 500;
  cursor: pointer; transition: var(--transition); margin-bottom: 2px;
  position: relative;
}
.nav-item i { width: 20px; text-align: center; font-size: 16px; }
.nav-item:hover { background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.9); }
.nav-item.active { background: rgba(255,107,53,0.2); color: #fff; }
.nav-item.active i { color: var(--primary); }
.nav-item.active::before {
  content: ''; position: absolute; left: -12px; top: 50%; transform: translateY(-50%);
  width: 3px; height: 24px; background: var(--primary); border-radius: 0 2px 2px 0;
}
.nav-badge {
  margin-left: auto; background: var(--danger); color: #fff;
  font-size: 10px; font-weight: 700; padding: 2px 7px; border-radius: 100px;
}

.sidebar-footer {
  padding: 16px 12px; border-top: 1px solid rgba(255,255,255,0.06);
}
.user-card {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border-radius: 10px; transition: var(--transition); cursor: pointer;
}
.user-card:hover { background: rgba(255,255,255,0.08); }
.user-avatar {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 700; color: #fff; flex-shrink: 0;
}
.user-info { flex: 1; min-width: 0; }
.user-name { font-size: 13px; font-weight: 700; color: #fff; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-role { font-size: 11px; color: rgba(255,255,255,0.4); }
.logout-btn { color: rgba(255,255,255,0.5); font-size: 16px; padding: 4px; background: transparent; transition: var(--transition); }
.logout-btn:hover { color: var(--danger); }

/* MAIN AREA */
.admin-shell { width: 100%; min-height: 100vh; }
.main-content {
  margin-left: var(--sidebar-width);
  width: calc(100% - var(--sidebar-width));
  min-width: 0;
  overflow-y: auto;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* HEADER */
.admin-header {
  height: var(--header-height); background: var(--white); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; padding: 0 28px;
  position: sticky; top: 0; z-index: 50;
  box-shadow: 0 1px 8px rgba(0,0,0,0.05);
}
.header-title h1 { font-size: 20px; font-weight: 700; color: var(--dark); }
.header-title p { font-size: 13px; color: var(--gray-light); }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.header-btn {
  width: 38px; height: 38px; border-radius: 10px; background: var(--bg);
  display: flex; align-items: center; justify-content: center; font-size: 16px;
  color: var(--gray); transition: var(--transition); position: relative; border: 1.5px solid var(--border);
}
.header-btn:hover { color: var(--primary); border-color: var(--primary); background: rgba(255,107,53,0.05); }
.notif-dot { position: absolute; top: 6px; right: 6px; width: 8px; height: 8px; background: var(--danger); border-radius: 50%; border: 2px solid #fff; }

/* PAGE CONTENT */
.page-content { flex: 1; padding: 28px; min-width: 0; }
.page-header-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.page-header-bar h2 { font-size: 22px; font-weight: 800; }

/* STATS CARDS */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 20px; margin-bottom: 28px; }
.stat-card {
  background: var(--white); border-radius: var(--radius); padding: 22px;
  box-shadow: var(--shadow); border: 1px solid var(--border); transition: var(--transition);
  display: flex; gap: 16px; align-items: center;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0;
}
.stat-icon.orange { background: rgba(255,107,53,0.12); color: var(--primary); }
.stat-icon.green { background: rgba(34,197,94,0.12); color: var(--success); }
.stat-icon.blue { background: rgba(59,130,246,0.12); color: var(--info); }
.stat-icon.purple { background: rgba(139,92,246,0.12); color: #8b5cf6; }
.stat-icon.yellow { background: rgba(245,158,11,0.12); color: var(--warning); }
.stat-icon.teal { background: rgba(20,184,166,0.12); color: #14b8a6; }
.stat-value { font-size: 26px; font-weight: 800; color: var(--dark); line-height: 1; margin-bottom: 4px; }
.stat-label { font-size: 13px; color: var(--gray-light); }
.stat-change { font-size: 12px; font-weight: 600; margin-top: 4px; display: flex; align-items: center; gap: 4px; }
.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* CARDS */
.admin-card { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--border); }
.card-header {
  padding: 20px 24px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.card-title { font-size: 16px; font-weight: 700; color: var(--dark); display: flex; align-items: center; gap: 8px; }
.card-title i { color: var(--primary); }
.card-body { padding: 24px; min-width: 0; }

/* TABLE */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
thead th {
  background: var(--bg); padding: 12px 16px; text-align: left;
  font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--gray); border-bottom: 2px solid var(--border); white-space: nowrap;
}
tbody td { padding: 14px 16px; border-bottom: 1px solid var(--border); font-size: 14px; color: var(--dark); vertical-align: middle; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: rgba(255,107,53,0.03); }

/* BUTTONS */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 18px; border-radius: 8px; font-size: 14px; font-weight: 600; cursor: pointer; border: none; transition: var(--transition); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; box-shadow: 0 4px 12px rgba(255,107,53,0.25); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(255,107,53,0.35); }
.btn-outline { border: 1.5px solid var(--border); background: var(--white); color: var(--dark); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { background: rgba(239,68,68,0.1); color: var(--danger); border: 1px solid rgba(239,68,68,0.2); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-success { background: rgba(34,197,94,0.1); color: var(--success); border: 1px solid rgba(34,197,94,0.2); }
.btn-success:hover { background: var(--success); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-icon { width: 32px; height: 32px; padding: 0; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 14px; }

/* FORMS */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--gray-light); margin-bottom: 8px; }
.form-control { width: 100%; padding: 10px 14px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 14px; background: var(--white); transition: var(--transition); color: var(--dark); }
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(255,107,53,0.1); }
.form-control::placeholder { color: var(--gray); }
.form-select { appearance: none; cursor: pointer; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M7 7l3-3 3 3m0 6l-3 3-3-3' stroke='%2394a3b8' stroke-width='1.5' fill='none'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10px center; background-size: 16px; padding-right: 36px; background-color: var(--white); color: var(--dark); border: 1.5px solid var(--border); border-radius: 8px; height: 43px; }
.form-select:focus { border-color: var(--primary); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.form-hint { font-size: 12px; color: var(--gray); margin-top: 6px; }

/* FILE UPLOAD */
.file-upload-wrap {
  border: 2px dashed var(--border); border-radius: 12px; padding: 24px; text-align: center;
  cursor: pointer; transition: var(--transition); position: relative; overflow: hidden;
}
.file-upload-wrap:hover { border-color: var(--primary); background: rgba(255,107,53,0.02); }
.file-upload-icon { font-size: 32px; color: var(--gray-light); margin-bottom: 12px; }
.file-upload-text { font-size: 14px; color: var(--gray); font-weight: 500; }
.file-upload-hint { font-size: 12px; color: var(--gray-light); margin-top: 4px; }
.file-upload-input { position: absolute; left: 0; top: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; }
.file-preview { margin-top: 16px; border-radius: 8px; overflow: hidden; display: none; }
.file-preview img { width: 100%; height: 160px; object-fit: cover; }

/* DATA CONTROLS */
.data-controls { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 24px; justify-content: space-between; align-items: center; }
.search-input { position: relative; width: 280px; }
.search-input i { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--gray); }
.search-input input { width: 100%; padding: 9px 12px 9px 36px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 14px; background: var(--white); transition: var(--transition); color: var(--dark); }
.search-input input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(255,107,53,0.1); }
.filter-select { padding: 9px 32px 9px 12px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 14px; background: var(--white); cursor: pointer; color: var(--dark); appearance: none; }
.filter-select:focus { border-color: var(--primary); }
.admin-filter-form { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.admin-multi-select { min-height: 150px; padding-right: 14px; }
.admin-inline-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.admin-cell-title { font-weight: 700; color: var(--dark); }
.admin-cell-subtitle { font-size: 12px; color: var(--gray); margin-top: 4px; }
.admin-stack { display: grid; gap: 20px; }
.admin-summary-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.admin-summary-card { border: 1px solid var(--border); border-radius: 12px; padding: 16px; background: var(--bg); }
.summary-label { font-size: 12px; color: var(--gray); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 8px; }
.summary-value { font-size: 16px; font-weight: 700; color: var(--dark); }
.admin-section-card { border: 1px solid var(--border); border-radius: 16px; background: var(--white); overflow: hidden; }
.admin-section-header { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 20px 24px; border-bottom: 1px solid var(--border); }
.admin-section-header h3 { font-size: 18px; color: var(--dark); margin-bottom: 6px; }
.admin-section-header p { font-size: 13px; color: var(--gray); }
.admin-inline-form { padding: 24px; border-top: 1px solid var(--border); background: rgba(148,163,184,0.06); }
.admin-checkbox-row { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 16px; }
.admin-checkbox { display: inline-flex; align-items: center; gap: 8px; color: var(--dark); font-size: 14px; }

/* BADGE */
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 100px; font-size: 12px; font-weight: 600; }
.badge-success { background: rgba(34,197,94,0.1); color: var(--success); }
.badge-danger { background: rgba(239,68,68,0.1); color: var(--danger); }
.badge-warning { background: rgba(245,158,11,0.1); color: var(--warning); }
.badge-info { background: rgba(59,130,246,0.1); color: var(--info); }
.badge-primary { background: rgba(255,107,53,0.1); color: var(--primary); }
.badge-gray { background: rgba(100,116,139,0.1); color: var(--gray); }
.badge-purple { background: rgba(139,92,246,0.1); color: #8b5cf6; }

/* MODAL */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(15,23,42,0.6); backdrop-filter: blur(4px);
  z-index: 1000; display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transition: var(--transition);
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-content {
  background: var(--white); border-radius: 20px; box-shadow: var(--shadow-lg);
  width: 90%; max-width: 600px; max-height: 90vh; overflow-y: auto;
  transform: translateY(20px) scale(0.95); opacity: 0; transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.modal-overlay.active .modal-content { transform: translateY(0) scale(1); opacity: 1; }
.modal-header { padding: 24px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; background: var(--white); z-index: 1; }
.modal-title { font-size: 18px; font-weight: 800; color: var(--dark); }
.modal-close { font-size: 20px; color: var(--gray); background: transparent; transition: var(--transition); width: 32px; height: 32px; border-radius: 8px; display: flex; align-items: center; justify-content: center; }
.modal-close:hover { background: rgba(239,68,68,0.1); color: var(--danger); }
.modal-body { padding: 24px; }
.modal-footer { padding: 20px 24px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 12px; background: var(--bg); border-radius: 0 0 20px 20px; }

/* PAGINATION */
.pagination { display: flex; align-items: center; gap: 6px; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); justify-content: space-between; }
.pagination-info { font-size: 13px; color: var(--gray); }
.pagination-btns { display: flex; gap: 4px; }
.page-btn { width: 34px; height: 34px; border-radius: 8px; border: 1.5px solid var(--border); background: var(--white); font-size: 13px; font-weight: 600; color: var(--dark); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.page-btn:hover, .page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* TOAST */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 10px; }
.toast { display: flex; align-items: center; gap: 12px; background: var(--dark); color: #fff; padding: 12px 18px; border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,0.2); min-width: 280px; border-left: 3px solid var(--primary); animation: slideInRight 0.3s ease; font-size: 14px; }
.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }
.toast.warning { border-color: var(--warning); }
@keyframes slideInRight { from{opacity:0;transform:translateX(100%)} to{opacity:1;transform:translateX(0)} }

/* DASHBOARD */
.admin-dashboard-grid { display: grid; grid-template-columns: minmax(0, 2fr) minmax(320px, 1fr); gap: 24px; align-items: stretch; }
.admin-dashboard-grid > * { min-width: 0; }
.admin-dashboard-card { overflow: hidden; }
.admin-dashboard-wide { min-width: 0; }
.admin-dashboard-subtitle {
  margin-top: 6px;
  font-size: 13px;
  color: var(--gray);
}
.admin-chart-container {
  height: 300px;
  position: relative;
  width: 100%;
  min-width: 0;
}
.admin-chart-container canvas {
  width: 100% !important;
  height: 100% !important;
}
.admin-chart-container-compact { height: 360px; }
.admin-dashboard-empty {
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--gray);
  font-size: 14px;
  border: 1px dashed var(--border);
  border-radius: 14px;
  background: rgba(148,163,184,0.05);
}

/* LOADING */
.loading-spinner { display: flex; justify-content: center; align-items: center; padding: 60px; }
.spinner { width: 40px; height: 40px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* EMPTY STATE */
.empty-state { text-align: center; padding: 60px 20px; color: var(--gray); }
.empty-state i { font-size: 48px; color: var(--border); margin-bottom: 16px; }
.empty-state h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: var(--dark); }

/* RESPONSIVE */
@media (max-width: 1200px) {
  .admin-dashboard-grid { grid-template-columns: 1fr; }
  .admin-chart-container-compact { height: 320px; }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content {
    margin-left: 0;
    width: 100%;
  }
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .admin-summary-grid { grid-template-columns: 1fr; }
  .admin-filter-form { width: 100%; }
  .admin-filter-form > * { width: 100%; }
  .admin-chart-container { height: 280px; }
  .admin-chart-container-compact { height: 300px; }
}