/* ========================================================================
   Polytraffic — Signal Grid Design System
   Base CSS (supplements Tailwind CDN)
   ======================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=Fira+Code:wght@400;500&display=swap');

/* --- Root Variables --- */
:root {
  --pt-base: #0c1222;
  --pt-surface: #141c30;
  --pt-overlay: #1e2a42;
  --pt-accent: #8b5cf6;
  --pt-accent-light: #a78bfa;
  --pt-secondary: #06b6d4;
  --pt-cta: #f97316;
  --pt-cta-hover: #fb923c;
  --pt-text: #f1f5f9;
  --pt-text-secondary: #94a3b8;
  --pt-text-muted: #64748b;
  --pt-border: #1e293b;
}

/* --- Base Resets --- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--pt-base);
  color: var(--pt-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* --- Typography Overrides --- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  color: var(--pt-text);
  line-height: 1.2;
}

code, pre, .font-mono {
  font-family: 'Fira Code', 'Consolas', monospace;
}

/* --- Article Prose --- */
.pt-prose {
  color: var(--pt-text-secondary);
  line-height: 1.8;
}

.pt-prose h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 1.5rem;
}

.pt-prose h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--pt-border);
  color: var(--pt-text);
}

.pt-prose h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--pt-accent-light);
}

.pt-prose p {
  margin-bottom: 1.25rem;
}

.pt-prose a {
  color: var(--pt-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.pt-prose a:hover {
  color: var(--pt-accent-light);
  border-bottom-color: var(--pt-accent-light);
}

.pt-prose strong {
  color: var(--pt-text);
  font-weight: 600;
}

.pt-prose blockquote {
  border-left: 3px solid var(--pt-accent);
  background: var(--pt-surface);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 0.5rem 0.5rem 0;
  color: var(--pt-text-secondary);
}

.pt-prose ul, .pt-prose ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.pt-prose li {
  margin-bottom: 0.5rem;
}

.pt-prose li::marker {
  color: var(--pt-accent);
}

.pt-prose code {
  background: var(--pt-surface);
  border: 1px solid var(--pt-border);
  padding: 0.15rem 0.4rem;
  border-radius: 0.25rem;
  font-size: 0.875em;
  color: var(--pt-secondary);
}

.pt-prose pre {
  background: var(--pt-surface);
  border: 1px solid var(--pt-border);
  border-radius: 0.5rem;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.pt-prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--pt-text-secondary);
}

.pt-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.875rem;
}

.pt-prose thead th {
  background: var(--pt-surface);
  color: var(--pt-text);
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--pt-accent);
}

.pt-prose tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--pt-border);
}

.pt-prose tbody tr:nth-child(even) {
  background: rgba(20, 28, 48, 0.5);
}

.pt-prose hr {
  border: none;
  border-top: 1px solid var(--pt-border);
  margin: 2.5rem 0;
}

.pt-prose img {
  border-radius: 0.5rem;
  max-width: 100%;
}

/* --- Component: Article Card --- */
.pt-card {
  background: var(--pt-surface);
  border: 1px solid var(--pt-border);
  border-left: 3px solid var(--pt-accent);
  border-radius: 0.5rem;
  padding: 1.5rem;
  transition: all 0.2s ease;
}

.pt-card:hover {
  border-color: var(--pt-overlay);
  border-left-color: var(--pt-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* --- Component: Stat Card --- */
.pt-stat {
  background: var(--pt-surface);
  border: 1px solid var(--pt-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  text-align: center;
}

.pt-stat-value {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
}

.pt-stat-label {
  font-size: 0.8125rem;
  color: var(--pt-text-muted);
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Component: CTA Box --- */
.pt-cta-box {
  background: linear-gradient(135deg, var(--pt-surface) 0%, rgba(139, 92, 246, 0.08) 100%);
  border: 1px solid var(--pt-accent);
  border-radius: 0.75rem;
  padding: 2.5rem;
}

/* --- Component: Bar Chart (CSS-only) --- */
.pt-bar {
  height: 2rem;
  border-radius: 0.25rem;
  transition: width 0.8s ease;
  position: relative;
}

.pt-bar-track {
  background: var(--pt-surface);
  border-radius: 0.25rem;
  height: 2rem;
  overflow: hidden;
  border: 1px solid var(--pt-border);
}

/* --- Component: FAQ Accordion --- */
.pt-faq details {
  border: 1px solid var(--pt-border);
  border-radius: 0.5rem;
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.pt-faq summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 500;
  color: var(--pt-text);
  background: var(--pt-surface);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.pt-faq summary::-webkit-details-marker {
  display: none;
}

.pt-faq summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--pt-accent);
  transition: transform 0.2s;
}

.pt-faq details[open] summary::after {
  content: '\2212';
}

.pt-faq details[open] summary {
  background: var(--pt-overlay);
  border-bottom: 1px solid var(--pt-border);
}

.pt-faq .pt-faq-body {
  padding: 1rem 1.25rem;
  color: var(--pt-text-secondary);
  line-height: 1.7;
}

/* --- Component: Breadcrumbs --- */
.pt-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--pt-text-muted);
}

.pt-breadcrumbs a {
  color: var(--pt-text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.pt-breadcrumbs a:hover {
  color: var(--pt-accent);
}

.pt-breadcrumbs .pt-chevron {
  color: var(--pt-text-muted);
  opacity: 0.5;
}

/* --- Component: Comparison Table --- */
.pt-comparison {
  width: 100%;
  border-collapse: collapse;
}

.pt-comparison thead th {
  background: var(--pt-surface);
  color: var(--pt-text);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 2px solid var(--pt-accent);
}

.pt-comparison tbody td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--pt-border);
  font-size: 0.9375rem;
}

.pt-comparison tbody tr:nth-child(even) {
  background: rgba(20, 28, 48, 0.6);
}

.pt-comparison tbody tr:hover {
  background: var(--pt-overlay);
}

/* --- Mega Nav --- */
.pt-meganav {
  position: relative;
}

.pt-meganav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--pt-surface);
  border: 1px solid var(--pt-border);
  border-radius: 0.5rem;
  padding: 0.5rem 0;
  z-index: 100;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

.pt-meganav-item:hover .pt-meganav-dropdown,
.pt-meganav-item:focus-within .pt-meganav-dropdown {
  display: block;
}

.pt-meganav-dropdown a {
  display: block;
  padding: 0.625rem 1.25rem;
  color: var(--pt-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all 0.15s;
}

.pt-meganav-dropdown a:hover {
  background: var(--pt-overlay);
  color: var(--pt-accent-light);
  padding-left: 1.5rem;
}

/* --- Utility: Glow --- */
.pt-glow {
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.15);
}

.pt-glow-secondary {
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.15);
}

/* --- Utility: Gradient text --- */
.pt-gradient-text {
  background: linear-gradient(135deg, var(--pt-accent), var(--pt-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Animations --- */
@keyframes pt-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes pt-slide-up {
  from { opacity: 0; transform: translateY(1rem); }
  to { opacity: 1; transform: translateY(0); }
}

.pt-animate-in {
  animation: pt-slide-up 0.5s ease forwards;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--pt-base);
}

::-webkit-scrollbar-thumb {
  background: var(--pt-overlay);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--pt-text-muted);
}

/* --- Selection --- */
::selection {
  background: rgba(139, 92, 246, 0.3);
  color: var(--pt-text);
}

/* --- Mobile Overrides --- */
@media (max-width: 768px) {
  .pt-prose h1 { font-size: 1.75rem; }
  .pt-prose h2 { font-size: 1.375rem; }
  .pt-stat-value { font-size: 2rem; }

  .pt-meganav-dropdown {
    position: static;
    box-shadow: none;
    border: none;
    border-top: 1px solid var(--pt-border);
    border-radius: 0;
  }
}