/* ========== CSS Variables ========== */
:root {
  --primary: #FF8C42;
  --primary-light: #FFE0C0;
  --primary-dark: #E67A30;
  --bg: #F5F6FA;
  --bg-white: #FFF;
  --text: #1A1A2E;
  --text2: #555;
  --text3: #999;
  --text4: #CCC;
  --border: #E8E8E8;
  --danger: #FF4D4F;
  --success: #52C41A;
  --warning: #FAAD14;
  --info: #1890FF;
  --radius: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.1);
  --sidebar-w: 220px;
  --topbar-h: 56px;
  --font-xs: 12px;
  --font-sm: 13px;
  --font-md: 14px;
  --font-lg: 16px;
  --font-xl: 20px;
  --font-xxl: 28px;
}

/* ========== Reset ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; font-size: var(--font-md); color: var(--text); background: var(--bg); }
a { text-decoration: none; color: var(--primary); }
input, select, textarea, button { font-family: inherit; font-size: inherit; }
table { border-collapse: collapse; width: 100%; }

/* ========== Layout ========== */
.layout { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-w); background: var(--text);
  color: #FFF; position: fixed; top: 0; left: 0; bottom: 0;
  display: flex; flex-direction: column; z-index: 100;
  transition: transform 0.3s;
}
.sidebar-logo {
  padding: 20px 20px 16px; display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar-logo .logo-icon { font-size: 28px; }
.sidebar-logo .logo-text { font-size: var(--font-lg); font-weight: 700; }
.sidebar-nav { flex: 1; padding: 12px 0; overflow-y: auto; }
.sidebar-nav .nav-title {
  padding: 8px 20px 4px; font-size: 10px; text-transform: uppercase;
  color: rgba(255,255,255,0.3); letter-spacing: 1px;
}
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 10px 20px;
  color: rgba(255,255,255,0.6); cursor: pointer; font-size: var(--font-sm);
  transition: all 0.15s; border-left: 3px solid transparent;
}
.nav-item:hover { color: #FFF; background: rgba(255,255,255,0.05); }
.nav-item.active { color: #FFF; background: rgba(255,140,66,0.2); border-left-color: var(--primary); }
.nav-item .nav-icon { font-size: 18px; width: 22px; text-align: center; }
.sidebar-footer {
  padding: 12px 20px; border-top: 1px solid rgba(255,255,255,0.08);
  display: flex; align-items: center; gap: 8px; font-size: var(--font-sm);
}
.sidebar-footer .user-avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--primary); display: flex; align-items: center; justify-content: center; color: #FFF; font-weight: 700; }

/* Main */
.main { flex: 1; margin-left: var(--sidebar-w); display: flex; flex-direction: column; }

/* Topbar */
.topbar {
  height: var(--topbar-h); background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; position: sticky; top: 0; z-index: 50;
}
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-left .menu-toggle {
  display: none; background: none; border: none; font-size: 22px;
  cursor: pointer; color: var(--text); padding: 4px;
}
.topbar-left .breadcrumb { font-size: var(--font-lg); font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 16px; }
.topbar-right .btn-logout {
  background: none; border: 1px solid var(--border); color: var(--text2);
  padding: 6px 16px; border-radius: var(--radius); cursor: pointer; font-size: var(--font-sm);
}
.topbar-right .btn-logout:hover { border-color: var(--danger); color: var(--danger); }

/* Content */
.content { flex: 1; padding: 20px 24px; overflow-y: auto; }

/* ========== Login ========== */
.login-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #FFF8F0, #FFE0C0);
}
.login-card {
  width: 380px; background: #FFF; border-radius: var(--radius-xl);
  padding: 40px 32px; box-shadow: var(--shadow-lg); text-align: center;
}
.login-card .login-logo { font-size: 48px; margin-bottom: 8px; }
.login-card .login-title { font-size: var(--font-xl); font-weight: 700; margin-bottom: 4px; }
.login-card .login-sub { font-size: var(--font-sm); color: var(--text3); margin-bottom: 32px; }
.form-group { margin-bottom: 16px; text-align: left; }
.form-group label { display: block; font-size: var(--font-sm); font-weight: 600; color: var(--text2); margin-bottom: 6px; }
.form-control {
  width: 100%; padding: 10px 14px; border: 1.5px solid var(--border);
  border-radius: var(--radius); font-size: var(--font-md); outline: none; transition: border 0.2s;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(255,140,66,0.1); }
.login-error { color: var(--danger); font-size: var(--font-sm); margin-bottom: 12px; display: none; }

/* ========== Common ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 18px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--bg-white); color: var(--text); cursor: pointer;
  font-size: var(--font-sm); font-weight: 500; transition: all 0.15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-pri { background: var(--primary); color: #FFF; border-color: var(--primary); }
.btn-pri:hover { background: var(--primary-dark); color: #FFF; }
.btn-danger { background: var(--danger); color: #FFF; border-color: var(--danger); }
.btn-danger:hover { background: #e04345; color: #FFF; }
.btn-success { background: var(--success); color: #FFF; border-color: var(--success); }
.btn-sm { padding: 4px 10px; font-size: var(--font-xs); }
.btn-lg { padding: 10px 24px; font-size: var(--font-md); }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Cards */
.card {
  background: var(--bg-white); border-radius: var(--radius-lg);
  padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px;
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.card-title { font-size: var(--font-lg); font-weight: 600; }

/* Stats */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 20px; }
.stat-card {
  background: var(--bg-white); border-radius: var(--radius-lg);
  padding: 20px; box-shadow: var(--shadow); display: flex; align-items: center; gap: 16px;
}
.stat-card .stat-icon { font-size: 36px; width: 56px; height: 56px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.stat-card .stat-icon.orange { background: #FFF0E0; }
.stat-card .stat-icon.blue { background: #E6F7FF; }
.stat-card .stat-icon.green { background: #F6FFED; }
.stat-card .stat-icon.red { background: #FFF1F0; }
.stat-card .stat-val { font-size: var(--font-xxl); font-weight: 700; display: block; }
.stat-card .stat-label { font-size: var(--font-sm); color: var(--text3); }

/* Table */
.table-wrap { overflow-x: auto; }
.data-table th, .data-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: var(--font-sm); }
.data-table th { background: #FAFAFA; font-weight: 600; color: var(--text2); white-space: nowrap; }
.data-table tbody tr:hover { background: #FAFAFA; }

/* Filter bar */
.filter-bar {
  display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap;
  margin-bottom: 16px;
}
.filter-bar .form-group { margin-bottom: 0; }
.filter-bar .form-control { width: auto; min-width: 140px; }

/* Tags / Badges */
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 12px;
  font-size: var(--font-xs); font-weight: 600;
}
.badge-green { background: #F6FFED; color: var(--success); }
.badge-red { background: #FFF1F0; color: var(--danger); }
.badge-orange { background: #FFF0E0; color: var(--primary); }
.badge-gray { background: #F5F5F5; color: var(--text3); }

/* Pagination */
.pagination { display: flex; justify-content: flex-end; gap: 6px; margin-top: 16px; }
.pagination .page-btn {
  width: 32px; height: 32px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--bg-white); cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: var(--font-sm);
}
.pagination .page-btn.active { background: var(--primary); color: #FFF; border-color: var(--primary); }
.pagination .page-btn:hover:not(.active) { border-color: var(--primary); }

/* Modal */
.modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4); z-index: 999; display: flex; align-items: center; justify-content: center;
  animation: fadeIn 0.2s;
}
.modal-box {
  background: #FFF; border-radius: var(--radius-xl); width: 90%; max-width: 640px;
  max-height: 85vh; overflow-y: auto; box-shadow: var(--shadow-lg);
  animation: slideUp 0.25s;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; border-bottom: 1px solid var(--border);
}
.modal-header .modal-title { font-size: var(--font-lg); font-weight: 600; }
.modal-close { background: none; border: none; font-size: 22px; cursor: pointer; color: var(--text3); padding: 4px 8px; }
.modal-body { padding: 24px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 24px; border-top: 1px solid var(--border); }

/* Toast */
.toast {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%); z-index: 9999;
  padding: 10px 24px; border-radius: var(--radius); font-size: var(--font-sm);
  box-shadow: var(--shadow-lg); animation: slideDown 0.3s;
  pointer-events: none;
}
.toast-success { background: var(--success); color: #FFF; }
.toast-error { background: var(--danger); color: #FFF; }
.toast-info { background: var(--info); color: #FFF; }

/* Empty */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text3); }
.empty-state .empty-icon { font-size: 56px; margin-bottom: 12px; }

/* Loading */
.loading-wrap { text-align: center; padding: 40px; color: var(--text3); }

/* Animations */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(30px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes slideDown { from { transform: translateX(-50%) translateY(-20px); opacity: 0; } to { transform: translateX(-50%) translateY(0); opacity: 1; } }

/* Responsive */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .topbar-left .menu-toggle { display: block; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
}