@import url("https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&family=Playfair+Display:wght@400;600;700&display=swap");

:root {
  --font-sans: "Outfit", system-ui, -apple-system, sans-serif;
  --font-serif: "Playfair Display", Georgia, serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", monospace;
  --max-width: 1200px;
  --radius: 24px;
  --radius-sm: 12px;

  /* Light Mode Palette - Rich & Premium */
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f4f9;

  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-tertiary: #718096;

  --accent-primary: #3b82f6;
  --accent-secondary: #8b5cf6;
  --accent-tertiary: #ec4899;

  --border-light: rgba(0, 0, 0, 0.06);
  --border-medium: rgba(0, 0, 0, 0.12);

  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
  --shadow-hover: 0 25px 50px -12px rgba(0, 0, 0, 0.15);

  --status-good: #10b981;
  --status-warn: #f59e0b;
  --status-bad: #ef4444;
}

:root[data-color-mode="dark"] {
  /* Dark Mode Palette - Deep & Tech */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;

  --accent-primary: #60a5fa;
  --accent-secondary: #a78bfa;
  --accent-tertiary: #f472b6;

  --border-light: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.12);

  --glass-bg: rgba(15, 23, 42, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 25px 50px -12px rgba(0, 0, 0, 0.5);

  --status-good: #34d399;
  --status-warn: #fbbf24;
  --status-bad: #f87171;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(236, 72, 153, 0.15) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* Glassmorphism Header */
.site-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  /* Force layout */
  gap: 1rem 2rem;
  align-items: center;
  padding: 1.2rem 2rem;
  position: sticky;
  top: 1rem;
  z-index: 100;
  margin: 0 1rem;

  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  box-shadow: var(--glass-shadow);
}

.site-brand a {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.4rem;
  text-decoration: none;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
  font-weight: 500;
}

.site-nav a {
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  color: var(--text-secondary);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  font-size: 0.95rem;
}

.site-nav a:hover {
  color: var(--text-primary);
  background: rgba(139, 92, 246, 0.1);
  /* Subtle accent bg */
}

.site-nav a.is-active {
  color: var(--bg-primary);
  /* Contrast text */
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
  border-radius: 999px;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
}

.theme-toggle:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
}

main [id] {
  scroll-margin-top: 8rem;
}

/* Typography Enhancements */
h1,
h2,
h3 {
  font-family: var(--font-sans);
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-top: 2.5rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  /* Fallback needs check if desired */
  /* Reset for readability if gradients fail, but modern browsers ok. */
  background-clip: text;
  /* standard */
  /* For simple text kill fill transparent */
  -webkit-text-fill-color: var(--text-primary);
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  display: block;
  width: 40px;
  height: 4px;
  background: var(--accent-secondary);
  margin-top: 0.5rem;
  border-radius: 2px;
}

h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  max-width: 75ch;
  line-height: 1.8;
}

/* Premium Card Design */
.card-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin-top: 2rem;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  text-decoration: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-medium);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  color: var(--text-primary);
  margin-top: 0;
}

.card p {
  color: var(--text-tertiary);
  font-size: 0.95rem;
  margin: 0.5rem 0 0;
  flex-grow: 1;
}

/* Hero Section */
.hero {
  display: grid;
  gap: 1.5rem;
  padding: 3.5rem;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  margin-bottom: 4rem;
}

.hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
  z-index: 0;
  pointer-events: none;
}

.hero h1 {
  z-index: 1;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  z-index: 1;
  font-size: 1.25rem;
  max-width: 600px;
}

.hero-actions {
  z-index: 1;
  margin-top: 1rem;
}

.hero-link {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  font-weight: 600;
  text-decoration: none;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border-radius: 999px;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hero-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
}

/* Visualizations & Code */
pre,
code {
  font-family: var(--font-mono);
}

pre {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 0.9rem;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.03);
}

.viz {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

/* Mermaid & D3 specific adjustments */
.viz svg {
  max-width: 100%;
}

.viz text {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--text-primary);
}

.viz .node {
  fill: var(--bg-tertiary);
  stroke: var(--text-tertiary);
  stroke-width: 2px;
}

.viz .edge {
  stroke: var(--text-secondary);
  stroke-width: 2px;
}

/* Playground Controls */
.playground-controls button {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-primary);
  transition: all 0.2s;
}

.playground-controls button:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
}

/* OS / DB Playground Specifics (Legacy class support primarily) */
.os-step-button,
.db-step-button {
  border: 1px solid var(--border-medium);
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.os-step-button:hover,
.db-step-button:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

/* Footer */
.site-footer {
  text-align: center;
  margin-top: 4rem;
  padding: 2rem;
  color: var(--text-tertiary);
  border-top: 1px solid var(--border-light);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .site-header {
    grid-template-columns: 1fr;
    justify-items: center;
    top: 0;
    margin: 0;
    border-radius: 0;
    border: none;
    border-bottom: 1px solid var(--glass-border);
  }

  .site-nav {
    margin-top: 1rem;
  }
}

.playground-controls {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-bottom: 1rem;
}

.playground-controls label {
  display: grid;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.playground-controls input,
.playground-controls select {
  border: 1px solid var(--border);
  background: var(--surface-1);
  color: var(--text);
  padding: 0.35rem 0.5rem;
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
}

.playground-output {
  display: grid;
  gap: 0.75rem;
}

.playground-bars {
  display: grid;
  gap: 0.5rem;
}

.playground-bar {
  display: grid;
  grid-template-columns: 120px 1fr 60px;
  gap: 0.5rem;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.playground-bar-fill {
  height: 0.6rem;
  background: var(--surface-3);
  transition: width 200ms ease;
  border-radius: 999px;
}

.playground-meter {
  border: 1px solid var(--border);
  height: 0.7rem;
  position: relative;
  border-radius: 999px;
  background: var(--surface-1);
}

.playground-meter-fill {
  height: 100%;
  background: var(--surface-4);
  width: 0%;
  transition: width 200ms ease;
  border-radius: 999px;
}

.playground-metrics {
  display: grid;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.playground-pods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(20px, 1fr));
  gap: 0.35rem;
}

.playground-pod {
  height: 14px;
  border: 1px solid var(--border);
  background: var(--surface-3);
  transition: opacity 200ms ease, background 200ms ease;
  border-radius: 6px;
}

.playground-pod.is-idle {
  background: var(--bg);
  opacity: 0.4;
}

.playground-note {
  font-size: 0.9rem;
  margin: 0;
}

/* Kubernetes Explorer */
#k8s-explorer-root {
  margin-top: 1.25rem;
}

.k8s-explorer,
.k8s-fallback {
  display: grid;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.k8s-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
}

.k8s-tabs,
.k8s-playback,
.k8s-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.k8s-tab,
.k8s-playback button {
  border: 1px solid var(--border-medium);
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.k8s-tab.is-active {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: var(--bg-primary);
  border-color: transparent;
}

.k8s-controls {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.k8s-control {
  display: grid;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.k8s-control input,
.k8s-control select {
  border: 1px solid var(--border-medium);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 0.35rem 0.5rem;
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
}

.k8s-canvas {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
}

.k8s-canvas svg {
  width: 100%;
  height: auto;
  display: block;
}

.k8s-canvas text {
  fill: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
}

.k8s-node {
  fill: var(--bg-secondary);
  stroke: var(--border-medium);
  stroke-width: 2px;
}

.k8s-node.is-good {
  stroke: var(--status-good);
}

.k8s-node.is-warn {
  stroke: var(--status-warn);
}

.k8s-node.is-bad {
  stroke: var(--status-bad);
}

.k8s-node.pulse {
  animation: k8sPulse 1.6s ease-in-out infinite;
}

.k8s-node.pulse-slow {
  animation: k8sPulse 2.6s ease-in-out infinite;
}

.k8s-edge {
  fill: none;
  stroke: var(--text-tertiary);
  stroke-width: 2px;
  opacity: 0.5;
}

.k8s-edge.flow {
  stroke-dasharray: 6 6;
}

.k8s-edge.is-active {
  opacity: 1;
  stroke: var(--accent-primary);
}

.k8s-edge.is-blocked {
  opacity: 1;
  stroke: var(--status-bad);
}

.k8s-packet {
  fill: var(--accent-tertiary);
  transition: transform 200ms ease, opacity 200ms ease;
}

.k8s-packet.is-hidden {
  opacity: 0;
}

.k8s-packet.is-blocked {
  fill: var(--status-bad);
}

.k8s-status {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.k8s-node-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.k8s-node-card {
  border: 1px solid var(--border-medium);
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
}

.k8s-node-card.is-blocked {
  border-color: var(--status-bad);
}

.k8s-node-card.is-selected {
  border-color: var(--status-good);
}

.k8s-node-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.k8s-node-meta,
.k8s-score-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.k8s-score {
  display: grid;
  gap: 0.35rem;
  margin: 0.45rem 0;
}

.k8s-score-bar {
  height: 8px;
  background: var(--border-light);
  border-radius: 999px;
  overflow: hidden;
}

.k8s-score-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

.k8s-compare {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.k8s-compare-column {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
}

.k8s-compare-column h3 {
  margin-top: 0;
}

.k8s-step {
  color: var(--text-secondary);
  margin: 0.3rem 0;
  padding: 0.18rem 0.35rem;
  border-radius: 6px;
}

.k8s-step.is-active {
  color: var(--text-primary);
  background: rgba(59, 130, 246, 0.16);
}

.k8s-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--border-medium);
  background: var(--bg-secondary);
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-secondary);
}

.k8s-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  display: inline-block;
}

.k8s-dot.good {
  background: var(--status-good);
}

.k8s-dot.warn {
  background: var(--status-warn);
}

.k8s-dot.bad {
  background: var(--status-bad);
}

@keyframes k8sPulse {
  0% {
    opacity: 0.72;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0.72;
  }
}

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--surface-1);
  border-radius: var(--radius) var(--radius) 0 0;
}

@media (max-width: 700px) {
  .site-header {
    padding: 1.1rem 1.2rem;
  }

  .site-nav {
    gap: 0.4rem 0.8rem;
  }

  .hero {
    padding: 1.5rem;
  }
}