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

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-green: #3fb950;
  --accent-orange: #d29922;
  --accent-red: #f85149;
  --border: #30363d;
  --code-bg: #161b22;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  --max-width: 960px;
  --header-height: 60px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
}

/* === Header / Nav === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
  padding: 0.25rem 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  transition: all 0.3s;
}

/* === Hero === */
.hero {
  padding: 5rem 1.5rem 4rem;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(88, 166, 255, 0.08) 0%, transparent 60%),
    var(--bg-primary);
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 550px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 700px;
  margin: 0 auto 2.5rem;
}

.stat {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 0.75rem;
}

.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-green);
  line-height: 1.2;
}

.stat-unit {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

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

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

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

.btn-secondary:hover {
  border-color: var(--text-secondary);
}

/* === Main Content === */
.main-content {
  min-height: calc(100vh - var(--header-height) - 120px);
}

.section {
  padding: 3rem 1.5rem;
}

.section-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* === Page Content (Markdown) === */
.page-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.page-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-top: 0.5rem;
}

.content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.3px;
}

.content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
}

.content p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.content a {
  color: var(--accent);
  text-decoration: none;
}

.content a:hover {
  text-decoration: underline;
}

.content ul,
.content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.content li {
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: var(--bg-secondary);
  border-radius: 0 6px 6px 0;
  color: var(--text-secondary);
}

/* === Code === */
.content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-tertiary);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent-orange);
}

.content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  line-height: 1.5;
}

.content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.85rem;
}

/* === Tables === */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
}

.content th {
  background: var(--bg-secondary);
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.content td {
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.content tr:hover td {
  background: var(--bg-secondary);
}

/* === Tech Badges === */
.tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.badge {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

/* === Architecture Diagram === */
.diagram {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--accent);
}

/* === Metric Highlight Cards === */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.metric-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  text-align: center;
}

.metric-card .value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-green);
}

.metric-card .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-card.exceeded .value {
  color: var(--accent-green);
}

.metric-card.missed .value {
  color: var(--accent-orange);
}

/* === Latency Histogram (CSS-only) === */
.histogram {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 120px;
  margin: 1.5rem 0;
  padding: 0 0 1.5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.histogram-bar {
  flex: 1;
  background: var(--accent);
  border-radius: 2px 2px 0 0;
  min-width: 12px;
  position: relative;
  transition: background 0.2s;
}

.histogram-bar:hover {
  background: var(--accent-hover);
}

.histogram-bar .bar-label {
  position: absolute;
  bottom: -1.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

/* === Info Box === */
.info-box {
  background: var(--bg-secondary);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.25rem;
  margin: 1rem 0 1.5rem;
}

.info-box.green {
  border-left-color: var(--accent-green);
}

.info-box.orange {
  border-left-color: var(--accent-orange);
}

/* === Component Cards === */
.component-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.component-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
}

.component-card h4 {
  color: var(--accent);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.component-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  background: var(--bg-secondary);
}

.footer-content p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* === Responsive === */
@media (max-width: 768px) {
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-value {
    font-size: 1.4rem;
  }

  .menu-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.5rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1rem;
    padding: 0.5rem 0;
  }

  .page-content {
    padding: 1.5rem 1rem 3rem;
  }

  .content pre {
    padding: 1rem;
    font-size: 0.8rem;
  }

  .component-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 3rem 1rem 2.5rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 250px;
    text-align: center;
  }
}

/* === Syntax Highlighting (Chroma - Monokai-inspired) === */
.highlight pre {
  background: var(--bg-secondary);
}

.chroma .k,
.chroma .kd,
.chroma .kn,
.chroma .kp,
.chroma .kr,
.chroma .kt { color: #f92672; }

.chroma .n,
.chroma .na,
.chroma .nb,
.chroma .nc,
.chroma .no,
.chroma .nd,
.chroma .ni,
.chroma .ne,
.chroma .nf,
.chroma .nl,
.chroma .nn,
.chroma .nt,
.chroma .nv { color: #a6e22e; }

.chroma .s,
.chroma .sa,
.chroma .sb,
.chroma .sc,
.chroma .dl,
.chroma .sd,
.chroma .s2,
.chroma .se,
.chroma .sh,
.chroma .si,
.chroma .sx,
.chroma .sr,
.chroma .s1,
.chroma .ss { color: #e6db74; }

.chroma .m,
.chroma .mb,
.chroma .mf,
.chroma .mh,
.chroma .mi,
.chroma .il,
.chroma .mo { color: #ae81ff; }

.chroma .c,
.chroma .ch,
.chroma .cm,
.chroma .c1,
.chroma .cs,
.chroma .cp,
.chroma .cpf { color: #75715e; }

.chroma .o,
.chroma .ow { color: #f92672; }

.chroma .p { color: var(--text-primary); }