/* ============================================
   Token Factory - Design System
   Inspired by Stripe + Vercel + Lumin AI
   ============================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
  /* Brand Colors */
  --brand-primary: #6366f1;       /* Indigo-500 — main brand */
  --brand-primary-hover: #4f46e5; /* Indigo-600 */
  --brand-primary-light: #e0e7ff; /* Indigo-100 */
  --brand-primary-subtle: #eef2ff;/* Indigo-50 */

  /* Neutral Scale */
  --gray-950: #0a0a0a;
  --gray-900: #171717;
  --gray-800: #262626;
  --gray-700: #404040;
  --gray-600: #525252;
  --gray-500: #737373;
  --gray-400: #a3a3a3;
  --gray-300: #d4d4d4;
  --gray-200: #e5e5e5;
  --gray-100: #f5f5f5;
  --gray-50: #fafafa;

  /* Status Colors */
  --success: #22c55e;
  --success-light: #dcfce7;
  --success-text: #166534;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --warning-text: #92400e;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --danger-text: #991b1b;
  --info: #3b82f6;
  --info-light: #dbeafe;
  --info-text: #1e40af;

  /* Shadows (Stripe-inspired blue-tinted) */
  --shadow-sm: 0 1px 2px 0 rgba(50, 50, 93, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(50, 50, 93, 0.1), 0 2px 4px -2px rgba(50, 50, 93, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(50, 50, 93, 0.1), 0 4px 6px -4px rgba(50, 50, 93, 0.06);
  --shadow-xl: 0 20px 25px -5px rgba(50, 50, 93, 0.12), 0 8px 10px -6px rgba(50, 50, 93, 0.06);
  --shadow-card: rgba(50, 50, 93, 0.15) 0px 20px 40px -15px, rgba(0, 0, 0, 0.08) 0px 12px 24px -12px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Layout */
  --sidebar-width: 240px;
  --sidebar-collapsed-width: 64px;
  --header-height: 64px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.5;
  min-height: 100vh;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--brand-primary-hover); }

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

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  background: #fff;
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: width 0.2s ease;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--gray-100);
  height: var(--header-height);
}

.sidebar-brand .logo {
  background-image: url(/tokenfactory/logo-white.png);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  background-color: #6366f1 !important;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sidebar-brand .brand-text {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-900);
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar.collapsed .brand-text { display: none; }

.sidebar-nav {
  flex: 1;
  padding: var(--space-3) var(--space-2);
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--gray-600);
  font-size: 14px;
  font-weight: 450;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  white-space: nowrap;
  margin-bottom: 2px;
}

.nav-item:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.nav-item.active {
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  font-weight: 500;
}

.nav-item .nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-item .nav-icon svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sidebar.collapsed .nav-item span { display: none; }
.sidebar.collapsed .nav-item { justify-content: center; padding: var(--space-3); }

.sidebar-footer {
  padding: var(--space-3) var(--space-2);
  border-top: 1px solid var(--gray-100);
}

/* --- Main Content Area --- */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  transition: margin-left 0.2s ease;
}

.sidebar.collapsed ~ .main-content {
  margin-left: var(--sidebar-collapsed-width);
}

/* --- Top Header --- */
.page-header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-header-left {
  display: flex;
  flex-direction: column;
}

.page-header-left h1 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--gray-900);
}

/* --- Page Content Area --- */
.page-content {
  padding: var(--space-6);
}

/* 充值页面卡片居中 */
.recharge-card {
  max-width: 520px;
}

.page-header-left p {
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 2px;
}

.page-header-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.mobile-menu-btn {
  display: none;
}

.sidebar-overlay {
  display: none;
}

.page-header-text {
  display: flex;
  flex-direction: column;
}

.balance-display {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--gray-50);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
}

.balance-display .balance-icon {
  width: 16px;
  height: 16px;
  color: var(--warning);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  transition: background 0.15s;
  position: relative;
}

.user-menu:hover { background: var(--gray-100); }

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
}

.user-menu-info {
  display: flex;
  flex-direction: column;
}

.user-menu-info .name {
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-900);
}

.user-menu-info .role {
  font-size: 11px;
  color: var(--gray-500);
}

.user-menu-arrow {
  color: var(--gray-400);
  transition: transform 0.2s;
  flex-shrink: 0;
}

.user-menu:hover .user-menu-arrow {
  color: var(--gray-600);
}

.user-menu.open .user-menu-arrow {
  transform: rotate(180deg);
}

.user-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  min-width: 150px;
  z-index: 100;
  overflow: hidden;
}

.user-dropdown.show {
  display: block;
}

.user-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-size: 13px;
  color: var(--gray-700);
  cursor: pointer;
  transition: background 0.15s;
}

.user-dropdown-item:hover {
  background: var(--gray-50);
  color: var(--gray-900);
}

.user-dropdown-icon {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
}

.user-dropdown-item:hover .user-dropdown-icon {
  color: var(--gray-600);
}

/* --- Page Body --- */
.page-body {
  padding: var(--space-6);
  max-width: 1400px;
}

/* --- Stat Cards Grid --- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.stat-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: box-shadow 0.15s;
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
}

.stat-card .stat-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}

.stat-card .stat-icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
}

.stat-card .stat-icon.purple {
  background: var(--brand-primary-subtle);
  color: var(--brand-primary);
}

.stat-card .stat-icon.green {
  background: var(--success-light);
  color: var(--success);
}

.stat-card .stat-icon.blue {
  background: var(--info-light);
  color: var(--info);
}

.stat-card .stat-icon.amber {
  background: var(--warning-light);
  color: var(--warning);
}

.stat-card .stat-label {
  font-size: 13px;
  color: var(--gray-500);
  font-weight: 450;
}

.stat-card .stat-value {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--gray-900);
  margin-top: 4px;
}

.stat-card .stat-sub {
  font-size: 12px;
  color: var(--gray-400);
  margin-top: 4px;
}

/* --- Card / Panel --- */
.card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-900);
}

.card-body {
  padding: var(--space-5);
}

/* --- Table --- */
.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

thead th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: 12px;
  font-weight: 500;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}

tbody td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
  vertical-align: middle;
}

tbody tr:hover {
  background: var(--gray-50);
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  white-space: nowrap;
  font-family: var(--font-sans);
  line-height: 1.5;
}

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

.btn-secondary {
  background: #fff;
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}
.btn-secondary:hover { background: var(--gray-50); border-color: var(--gray-400); }

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  padding: var(--space-2);
}
.btn-ghost:hover { background: var(--gray-100); color: var(--gray-900); }

.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-danger:hover { background: #dc2626; }

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: 12px;
}

.btn-icon {
  padding: var(--space-2);
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.5;
}

.badge-success {
  background: var(--success-light);
  color: var(--success-text);
}

.badge-warning {
  background: var(--warning-light);
  color: var(--warning-text);
}

.badge-danger {
  background: var(--danger-light);
  color: var(--danger-text);
}

.badge-info {
  background: var(--info-light);
  color: var(--info-text);
}

.badge-neutral {
  background: var(--gray-100);
  color: var(--gray-600);
}

/* --- Input --- */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: var(--space-1);
}

.form-input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-family: var(--font-sans);
  color: var(--gray-900);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.form-input:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder { color: var(--gray-400); }

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23737373' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.15s ease;
}

.modal {
  background: #fff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 90%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.2s ease;
}

.modal-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.modal-body {
  padding: var(--space-6);
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--gray-100);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* --- Token display --- */
.token-display {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--gray-50);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray-700);
}

.token-display .token-value {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Action buttons group (table row) --- */
.action-group {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.action-btn {
  padding: 4px 8px;
  font-size: 12px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 450;
  transition: all 0.15s;
  background: transparent;
  color: var(--brand-primary);
}

.action-btn:hover { background: var(--brand-primary-subtle); }
.action-btn.danger { color: var(--danger); }
.action-btn.danger:hover { background: var(--danger-light); }
.action-btn.primary { background: var(--brand-primary); color: #fff; }
.action-btn.primary:hover { background: var(--brand-primary-dark); }

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--gray-400);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  stroke: var(--gray-300);
  fill: none;
  stroke-width: 1.2;
}

.empty-state h4 {
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-500);
  margin-bottom: var(--space-2);
}

.empty-state p {
  font-size: 13px;
  max-width: 320px;
  margin: 0 auto;
}

/* --- Auth Pages (Login/Register) --- */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f5f3ff 0%, #eff6ff 50%, #f0f9ff 100%);
}

.auth-card {
  width: 90%;
  max-width: 420px;
  background: #fff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  padding: var(--space-10);
}

.auth-card .auth-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.auth-card .auth-brand .logo {
  background-image: url(/tokenfactory/logo-white.png);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  background-color: #6366f1 !important;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-card .auth-brand h1 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--gray-900);
}

.auth-card h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--gray-900);
}

.auth-card .auth-subtitle {
  font-size: 14px;
  color: var(--gray-500);
  margin-bottom: var(--space-6);
}

.auth-card .form-group {
  margin-bottom: var(--space-4);
}

.auth-card .btn-primary {
  width: 100%;
  justify-content: center;
  padding: var(--space-3);
  font-size: 15px;
}

.auth-card .auth-footer {
  text-align: center;
  margin-top: var(--space-5);
  font-size: 13px;
  color: var(--gray-500);
}

.auth-card .auth-footer a {
  font-weight: 500;
}

/* --- API Endpoint Bar --- */
.endpoint-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  font-size: 13px;
}

.endpoint-bar .endpoint-label {
  font-weight: 500;
  color: var(--gray-500);
  flex-shrink: 0;
}

.endpoint-bar .endpoint-url {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gray-700);
  background: #fff;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-200);
  flex: 1;
}

.endpoint-bar .btn-copy {
  flex-shrink: 0;
}

/* --- Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-4);
}

.pagination .page-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--gray-600);
  cursor: pointer;
  font-size: 13px;
  font-family: var(--font-sans);
  transition: all 0.15s;
}

.pagination .page-btn:hover { background: var(--gray-100); }
.pagination .page-btn.active { background: var(--brand-primary); color: #fff; }

/* --- Quick Action Cards (Dashboard) --- */
.quick-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.quick-action-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  display: block;
}

.quick-action-card:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-md);
}

.quick-action-card h4 {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-900);
  margin-bottom: var(--space-1);
}

.quick-action-card p {
  font-size: 12px;
  color: var(--gray-500);
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

.fade-in {
  animation: fadeIn 0.2s ease;
}

/* --- Toast --- */
.toast-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toast {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-lg);
  font-size: 13px;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  animation: slideUp 0.2s ease;
  max-width: 360px;
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }

/* --- Responsive --- */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width);
  }
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0 !important;
  }
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-body {
    padding: var(--space-4);
  }

  .quick-action-card {
    min-height: 64px;
    padding: var(--space-4);
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
    height: auto;
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }

  .page-header-left {
    flex-direction: row;
    align-items: center;
  }

  .page-header-left h1 {
    font-size: 18px;
  }

  .page-header-left p {
    font-size: 12px;
  }

  .page-header-right {
    width: 100%;
    justify-content: space-between;
  }

  .user-menu-info {
    display: none;
  }

  .balance-display {
    font-size: 13px;
    padding: var(--space-1) var(--space-2);
  }
}

/* Extra small screens */
@media (max-width: 480px) {
  .stat-grid {
    grid-template-columns: 1fr;
  }
  .page-header-left h1 {
    font-size: 16px;
  }
  .page-header-left p {
    font-size: 11px;
  }
  .stat-card {
    padding: var(--space-4);
  }
  .quick-action-card {
    padding: var(--space-3);
  }
}

/* ============================================
   Usage Page — Compact
   ============================================ */

.usage-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.stat-card-compact {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  min-height: auto;
}

.stat-card-compact .stat-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 0;
  flex-shrink: 0;
}

.stat-card-compact .stat-icon svg {
  width: 16px;
  height: 16px;
}

.stat-card-compact .stat-meta {
  flex: 1;
  min-width: 0;
}

.stat-card-compact .stat-label {
  font-size: 12px;
  margin-bottom: 2px;
}

.stat-card-compact .stat-value {
  font-size: 22px;
  margin-top: 0;
}

.stat-card-compact .stat-sub {
  font-size: 11px;
  margin-top: 2px;
  color: var(--gray-500);
}

/* Compact filter bar */
.usage-filter-bar {
  display: flex;
  align-items: flex-end;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
  padding: var(--space-4) var(--space-5);
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  flex-wrap: nowrap;
}

.usage-filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 150px;
  width: 170px;
  flex: 0 0 auto;
}

.usage-filter-group label {
  font-size: 12px;
  font-weight: 500;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.usage-filter-group .form-input,
.usage-filter-group .form-select {
  padding: var(--space-2) var(--space-3);
  font-size: 14px;
  min-height: 38px;
}

.usage-filter-actions {
  display: flex;
  gap: var(--space-3);
  padding-bottom: 1px;
  flex-shrink: 0;
  margin-left: var(--space-2);
}

/* Table compact */
.usage-table-card {
  border: 1px solid var(--gray-200);
}

.usage-table-header {
  padding: var(--space-3) var(--space-4);
}

.usage-table-header h3 {
  font-size: 14px;
}

.usage-count-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  background: var(--brand-primary-subtle);
  color: var(--brand-primary);
}

.usage-table {
  width: 100%;
}

.usage-table thead th {
  background: var(--gray-50);
  font-size: 11px;
  font-weight: 600;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}

.usage-table tbody tr {
  transition: background 0.12s ease;
}

.usage-table tbody tr:hover {
  background: var(--brand-primary-subtle);
}

.usage-table tbody td {
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--gray-100);
  font-size: 13px;
  color: var(--gray-700);
  vertical-align: middle;
}

.usage-token-id {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gray-600);
  background: var(--gray-100);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
}

.usage-model-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  background: var(--info-light);
  color: var(--info-text);
}

.usage-token-in {
  color: var(--info);
  font-weight: 500;
  font-size: 12px;
}

.usage-token-out {
  color: var(--success);
  font-weight: 500;
  font-size: 12px;
}

.usage-token-divider {
  color: var(--gray-400);
  margin: 0 2px;
  font-size: 12px;
}

.usage-total {
  font-weight: 600;
  color: var(--gray-900);
  font-size: 13px;
}

.usage-path {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gray-500);
  background: var(--gray-50);
  padding: 1px 5px;
  border-radius: var(--radius-sm);
}

.usage-time {
  font-size: 12px;
  color: var(--gray-500);
  white-space: nowrap;
}

/* Responsive */
@media (max-width: 768px) {
  .usage-filter-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .usage-filter-group {
    min-width: auto;
  }
  .usage-filter-actions {
    justify-content: flex-end;
  }
  .usage-stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 返回首页链接 */
.back-home-link {
  display: block;
  text-align: right;
  margin-bottom: 12px;
  color: #6b7280;
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s;
}
.back-home-link:hover {
  color: #10b981;
}


/* 模型分组标题 */
.model-group-title {
  font-size: 18px;
  font-weight: 600;
  color: #1f2937;
  margin: 48px 0 24px 0;
  padding-left: 12px;
  border-left: 4px solid #10b981;
  line-height: 3;
}
.model-group-title:first-child {
  margin-top: 0;
}

/* Mobile token page fixes */
@media (max-width: 768px) {
  .endpoint-bar {
    flex-wrap: wrap;
  }
  .endpoint-bar .endpoint-url {
    word-break: break-all;
    white-space: normal;
    min-width: 0;
  }
  /* Table card layout on mobile */
  .card .table-wrapper table,
  .card .table-wrapper tbody,
  .card .table-wrapper tr,
  .card .table-wrapper td {
    display: block;
    width: 100%;
  }
  .card .table-wrapper thead {
    display: none;
  }
  .card .table-wrapper tbody tr {
    margin-bottom: 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 16px;
    background: #fff;
  }
  .card .table-wrapper tbody td {
    border: none;
    padding: 8px 0;
  }
  .card .table-wrapper tbody td:last-child {
    padding-top: 12px;
    border-top: 1px solid var(--gray-100);
    margin-top: 8px;
  }
  /* Prevent horizontal overflow */
  html, body {
    overflow-x: hidden;
  }
  code, pre {
    word-break: break-all;
    white-space: pre-wrap;
  }
}