@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --bg-app: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-subtle: #f8fafc;
  --border: #e2e8f0;
  --border-focus: #0284c7;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;

  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-tint: #e0f2fe;

  --success: #059669;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;

  --warning: #d97706;
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;

  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;

  --sidebar-bg: #090e17;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-card: 8px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-dropdown: 0 10px 15px -3px rgba(0, 0, 0, 0.15), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  --sidebar-w: 240px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  font-size: 13.5px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.cn-text {
  font-size: 11px;
  opacity: 0.85;
  margin-left: 4px;
  font-weight: normal;
}

/* App Shell */
.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-w);
  background-color: var(--sidebar-bg);
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  border-right: 1px solid #1e293b;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-brand {
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-badge {
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 12px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
}

.sidebar-title {
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
}

.sidebar-nav {
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav-section-label {
  font-size: 11px;
  font-weight: 600;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 12px 10px 4px 10px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  color: #94a3b8;
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all 150ms ease;
  cursor: pointer;
  user-select: none;
}

.nav-item:hover {
  background-color: rgba(255, 255, 255, 0.06);
  color: #ffffff;
}

.nav-item.active {
  background-color: var(--primary);
  color: #ffffff;
  font-weight: 600;
}

.nav-item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Main Area */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 56px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topbar-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.content-body {
  padding: 24px;
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
}

/* Page Header */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.page-title {
  font-size: 19px;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.2px;
}

.page-subtitle {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Cards */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  overflow: hidden;
}

.card-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface);
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

.card-body {
  padding: 18px;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 16px 18px;
  box-shadow: var(--shadow-sm);
}

.stat-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.stat-value {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  margin: 6px 0 4px 0;
}

.stat-sub {
  font-size: 12px;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  height: 34px;
  padding: 0 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 150ms ease;
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary, .btn-outline {
  background-color: var(--bg-surface);
  border-color: var(--border);
  color: var(--text-main);
}

.btn-secondary:hover, .btn-outline:hover {
  background-color: var(--bg-subtle);
  border-color: #cbd5e1;
}

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

.btn-danger:hover {
  background-color: #b91c1c;
}

.btn-sm {
  height: 28px;
  padding: 0 10px;
  font-size: 12px;
}

.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.btn-icon:hover {
  background-color: var(--bg-subtle);
  color: var(--text-main);
  border-color: var(--border);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 14px;
}

.form-label {
  display: block;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 5px;
}

.form-control, .input {
  width: 100%;
  height: 34px;
  padding: 0 10px;
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 150ms, box-shadow 150ms;
}

.form-control:focus, .input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.15);
}

.form-hint {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 3px;
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #cbd5e1;
  transition: .2s;
  border-radius: 22px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .2s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--success);
}

input:checked + .slider:before {
  transform: translateX(18px);
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  text-align: left;
}

.table th {
  background-color: #f8fafc;
  padding: 10px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-main);
  vertical-align: middle;
}

.table tr:last-child td {
  border-bottom: none;
}

.table tr:hover td {
  background-color: #f8fafc;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 500;
  border-radius: 9999px;
  white-space: nowrap;
}

.badge-success {
  background-color: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success-border);
}

.badge-warning {
  background-color: var(--warning-bg);
  color: var(--warning);
  border: 1px solid var(--warning-border);
}

.badge-danger {
  background-color: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger-border);
}

.badge-info {
  background-color: #e0f2fe;
  color: #0369a1;
  border: 1px solid #bae6fd;
}

.badge-gray {
  background-color: #f1f5f9;
  color: #475569;
  border: 1px solid #e2e8f0;
}

/* Dropdown */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 4px;
  min-width: 190px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-dropdown);
  padding: 4px;
  z-index: 50;
  display: none;
}

.dropdown.open .dropdown-menu {
  display: block;
}

.dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 8px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-main);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  text-align: left;
  cursor: pointer;
  text-decoration: none;
}

.dropdown-item:hover {
  background-color: var(--bg-subtle);
}

.dropdown-item.text-danger {
  color: var(--danger);
}

.dropdown-item.text-danger:hover {
  background-color: var(--danger-bg);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border);
  margin: 4px 0;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-md);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  background-color: #f8fafc;
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
  overflow-x: auto;
}

.tab-btn {
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  padding: 10px 16px;
  background: #1e293b;
  color: #ffffff;
  border-radius: var(--radius-md);
  font-size: 13px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 8px;
}

@media (max-width: 768px) {
  .app-container { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: relative; }
  .content-body { padding: 14px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}