/* === AI Usage Dashboard — Dark Theme Stylesheet === */
:root {
  --bg-primary: #0f172a;
  --bg-card: #1e293b;
  --border-card: #334155;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --radius: 12px;
  --transition: 0.25s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ─── Top Bar ─── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-card);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar h1 {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.2rem;
  border: none;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), transform 0.15s ease;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.96);
}

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

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

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border-card);
  color: var(--text-primary);
}

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.06);
}

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

.btn-danger:hover {
  background-color: rgba(239, 68, 68, 0.1);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ─── Main Container ─── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* ─── Dashboard Controls ─── */
.dashboard-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.last-updated {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.refresh-btn .spinner {
  display: none;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.refresh-btn.loading .btn-label {
  display: none;
}

.refresh-btn.loading .spinner {
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ─── Provider Cards Grid ─── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.4);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-provider {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.card-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.card-name {
  font-size: 1.1rem;
  font-weight: 600;
}

/* ─── Status Indicator ─── */
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  transition: background var(--transition);
}

.status-dot.ok {
  background-color: var(--success);
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.5);
}

.status-dot.warning {
  background-color: var(--warning);
  box-shadow: 0 0 6px rgba(245, 158, 11, 0.5);
}

.status-dot.error {
  background-color: var(--danger);
  box-shadow: 0 0 6px rgba(239, 68, 68, 0.5);
}

/* ─── Card Body ─── */
.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card-stat {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(51, 65, 85, 0.4);
}

.card-stat:last-child {
  border-bottom: none;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.stat-value.balance {
  font-size: 1.4rem;
  color: var(--accent);
}

.stat-value.tokens {
  color: var(--warning);
}

.card-empty {
  color: var(--text-secondary);
  font-style: italic;
  font-size: 0.85rem;
}

/* ─── Chart Section ─── */
.chart-section {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.chart-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.chart-container {
  position: relative;
  width: 100%;
  max-height: 350px;
}

/* ─── Loading States ─── */
.loading-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-card);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.loading-text {
  margin-top: 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-align: center;
}

/* ─── Error State ─── */
.error-message {
  background-color: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  color: var(--danger);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.error-message .retry-btn {
  margin-left: auto;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .topbar {
    padding: 0.75rem 1rem;
  }

  .topbar h1 {
    font-size: 1.1rem;
  }

  .container {
    padding: 1rem;
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .dashboard-controls {
    flex-direction: column;
    align-items: flex-start;
  }

  .card {
    padding: 1.25rem;
  }

  .chart-section {
    padding: 1rem;
  }

  .stat-value.balance {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .topbar-actions {
    gap: 0.4rem;
  }

  .btn {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }

  .card-icon {
    font-size: 1.4rem;
  }

  .card-name {
    font-size: 0.95rem;
  }
}

/* ─── Utilities ─── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ─── Login Page ─── */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg-primary);
}

.login-container {
  width: 100%;
  max-width: 420px;
  padding: 2rem;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.login-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.login-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.login-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.btn-google {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.75rem 1.5rem;
  background: #fff;
  color: #333;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
}

.btn-google:hover {
  background: #f5f5f5;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.btn-google svg {
  flex-shrink: 0;
}