:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: #334155;
  --radius: 8px;
}

/* Smooth scroll */
html {
  scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Feature card hover */
.feature-card {
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(59, 130, 246, 0.1);
}

/* Pricing card hover */
.pricing-card {
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.pricing-card:hover {
  transform: translateY(-4px);
}

/* Source badge */
.source-badge {
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.source-badge:hover {
  transform: scale(1.05);
}

/* Code block styling */
.code-block pre code {
  color: var(--text-primary);
}
.code-block .keyword { color: #c084fc; }
.code-block .string { color: var(--success); }
.code-block .comment { color: var(--text-secondary); }
.code-block .function { color: var(--accent); }

/* Loading spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Pulse dot */
.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

/* News card */
.news-item {
  transition: background-color 0.15s ease, border-color 0.15s ease;
}
.news-item:hover {
  background-color: rgba(30, 41, 59, 0.8);
  border-color: var(--border);
}

/* Category tabs */
.tab-btn {
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 14px;
  white-space: nowrap;
}
.tab-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.tab-btn:hover:not(.active) {
  border-color: var(--accent);
  color: var(--text-primary);
}

/* Sentiment badges */
.sentiment-positive {
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
  border: 1px solid rgba(34, 197, 94, 0.2);
}
.sentiment-negative {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}
.sentiment-neutral {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

/* Fade in animation */
.fade-in {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive grid helpers */
@media (max-width: 640px) {
  .hero-title {
    font-size: 2rem;
  }
}

/* Input focus glow */
input:focus, textarea:focus, select:focus {
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Table styling */
.api-table th {
  font-weight: 500;
  text-transform: none;
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 40;
}
.back-to-top.visible {
  opacity: 1;
}
.back-to-top:hover {
  border-color: var(--accent);
}