@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ── Design tokens ───────────────────────────────────────── */

:root {
  /* Backgrounds */
  --bg-deep: #0e1117;
  --bg-surface: #161b22;
  --bg-raised: #1c2128;
  --bg-elevated: #242b35;

  /* Text */
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #656d76;

  /* Accents */
  --accent-amber: #e5a84b;
  --accent-amber-bright: #f0b960;
  --accent-teal: #2dd4a8;
  --accent-teal-dark: #14b893;
  --error-red: #e06c6c;

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(45, 212, 168, 0.2);

  /* Syntax highlighting */
  --code-keyword: #ff7b72;
  --code-string: #a5d6ff;
  --code-number: #79c0ff;
  --code-type: #ffa657;
  --code-function: #d2a8ff;
  --code-comment: #656d76;
  --code-faultline: var(--accent-teal);
  --code-property: #e6edf3;

  /* Layout */
  --max-width: 1180px;
  --nav-height: 60px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.25);
  --shadow-elevated: 0 8px 40px rgba(0, 0, 0, 0.35);
}

/* ── Reset ───────────────────────────────────────────────── */

::selection {
  background: rgba(45, 212, 168, 0.25);
  color: inherit;
}

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

html {
  scroll-behavior: smooth;
  background: var(--bg-deep);
}

body {
  color: var(--text-primary);
  background: var(--bg-deep);
  font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

code,
pre {
  font-family: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, monospace;
  font-variant-ligatures: none;
}

:not(pre) > code {
  padding: 0.15em 0.45em;
  border-radius: 4px;
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  font-size: 0.88em;
  color: var(--accent-teal);
}

/* ── Typography ──────────────────────────────────────────── */

h1, h2, h3 {
  font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
}

.section {
  padding: 80px 0;
}

.section h2 {
  text-align: center;
  margin-bottom: 0.75rem;
}

.section-sub {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 3rem;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ── Navigation ──────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(14, 17, 23, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 1rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-brand svg {
  width: 24px;
  height: 24px;
  color: var(--accent-teal);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent-teal);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  z-index: 110;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Code blocks ─────────────────────────────────────────── */

.code-block {
  position: relative;
  margin: 0;
  overflow-x: auto;
  padding: 0.85rem 0;
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.75;
  white-space: normal;
}

.code-block code {
  display: block;
  min-width: fit-content;
  white-space: normal;
}

.code-line {
  display: flex;
  gap: 1rem;
  padding: 0 1.2rem;
  white-space: pre;
  min-height: 1.75em;
}

.code-line-no {
  color: var(--text-muted);
  opacity: 0.5;
  text-align: right;
  user-select: none;
  min-width: 1.5rem;
  flex-shrink: 0;
}

.code-line-content {
  white-space: pre;
  flex: 1;
}

.code-lang {
  position: absolute;
  top: 8px;
  right: 48px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  user-select: none;
}

.code-copy {
  position: absolute;
  top: 6px;
  right: 8px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.code-copy:hover {
  color: var(--text-primary);
  border-color: var(--border-accent);
}

/* Syntax token classes */
.token-keyword  { color: var(--code-keyword); }
.token-string   { color: var(--code-string); }
.token-number   { color: var(--code-number); }
.token-type     { color: var(--code-type); }
.token-function { color: var(--code-function); }
.token-comment  { color: var(--code-comment); font-style: italic; }
.token-property { color: var(--code-property); }
.token-faultline { color: var(--code-faultline); font-weight: 600; }
.token-operator { color: var(--text-muted); }
.token-arrow    { color: var(--text-muted); }
.token-punctuation { color: var(--text-secondary); }

/* ── Hero ────────────────────────────────────────────────── */

.hero {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero-sub {
  max-width: 440px;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  font-size: 1.08rem;
  line-height: 1.7;
}

/* Install picker */
.install-box {
  margin-bottom: 1.5rem;
}

.install-tabs {
  display: inline-flex;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

.install-tab {
  padding: 0.35rem 0.7rem;
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  transition: background 0.15s ease, color 0.15s ease;
}

.install-tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.install-tab.is-active {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.install-cmd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
}

.install-cmd code {
  overflow-x: auto;
  white-space: nowrap;
  min-width: 0;
  color: var(--accent-teal);
  font-size: 0.88rem;
}

.install-copy {
  flex-shrink: 0;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.74rem;
  font-weight: 600;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.install-copy:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}

/* CTA buttons */
.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: 2px solid var(--accent-teal);
  outline-offset: 2px;
}

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

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

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

.btn-secondary:hover {
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.04);
}

/* ── Feature cards ───────────────────────────────────────── */

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform 0.2s ease, border-color 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-accent);
}

.feature-card .feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.85rem;
  display: block;
}

.feature-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.55;
}

/* ── Strata (adoption path) ──────────────────────────────── */

.strata {
  display: grid;
  gap: 1rem;
}

.stratum {
  display: block;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.5rem 1.5rem 1.75rem;
  border-left: 3px solid var(--text-muted);
  transition: transform 0.2s ease, border-color 0.3s ease;
  text-decoration: none;
  color: inherit;
}

.stratum:hover {
  transform: translateX(4px);
}

.stratum-1 {
  border-left-color: var(--accent-teal);
}

.stratum-2 {
  border-left-color: var(--accent-amber);
}

.stratum-3 {
  border-left-color: var(--code-function);
}

.stratum-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.stratum-1 .stratum-label { color: var(--accent-teal); }
.stratum-2 .stratum-label { color: var(--accent-amber); }
.stratum-3 .stratum-label { color: var(--code-function); }

.stratum h3 {
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}

.stratum p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.55;
  margin: 0;
}

.stratum .stratum-aside {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ── Comparison table ────────────────────────────────────── */

.comparison {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.comparison table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 640px;
}

.comparison thead th {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 2px solid var(--border-subtle);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.85rem;
  white-space: nowrap;
}

.comparison thead th:last-child {
  color: var(--accent-teal);
}

.comparison tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: middle;
}

.comparison tbody td:first-child {
  color: var(--text-primary);
  font-weight: 500;
}

.comparison tbody tr:last-child td {
  border-bottom: none;
}

.check {
  color: var(--accent-teal);
  font-weight: 600;
}

.cross {
  color: var(--text-muted);
}

.partial {
  color: var(--accent-amber);
  font-size: 0.82rem;
}

/* ── Seismograph divider ─────────────────────────────────── */

.seismo-divider {
  display: block;
  width: 100%;
  height: 40px;
  margin: 0 auto;
  overflow: visible;
}

.seismo-divider path {
  fill: none;
  stroke: var(--accent-teal);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.3;
}

/* ── Demo editor ─────────────────────────────────────────── */

.demo-editor {
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
  position: relative;
}

.demo-tab-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.demo-tab-bar svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.demo-tab-bar span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
}

.demo-code-area {
  position: relative;
  padding: 0;
  height: 240px;
  overflow: hidden;
}

.demo-act {
  position: absolute;
  inset: 0;
  padding: 0.85rem 0;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
  pointer-events: none;
}

.demo-act.is-active {
  opacity: 1;
  pointer-events: auto;
}

.demo-line {
  display: flex;
  gap: 1rem;
  padding: 0 1.25rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  line-height: 1.8;
  white-space: nowrap;
}

/* Line number — matches .demo-gutter class used in demo.js */
.demo-gutter {
  color: var(--text-muted);
  text-align: right;
  user-select: none;
  opacity: 0.6;
  min-width: 1.2rem;
  flex-shrink: 0;
}

.demo-line-code {
  white-space: pre;
}

/* Squiggly underline for ESLint errors */
.demo-squiggly {
  text-decoration: wavy underline var(--error-red);
  text-decoration-skip-ink: none;
  text-underline-offset: 3px;
  opacity: 0;
  transition: opacity 0.4s ease-in-out;
}

.demo-squiggly.is-visible {
  opacity: 1;
}

/* Tooltip for ESLint messages */
.demo-tooltip {
  position: absolute;
  left: 3.25rem;
  bottom: 1rem;
  padding: 0.5rem 0.75rem;
  background: var(--bg-elevated);
  border: 1px solid rgba(224, 108, 108, 0.3);
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--text-secondary);
  white-space: nowrap;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.4s ease-in-out, transform 0.4s ease-in-out;
  pointer-events: none;
  z-index: 5;
  box-shadow: var(--shadow-card);
}

.demo-tooltip.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.demo-tooltip .tooltip-icon {
  color: var(--accent-amber);
}

.demo-tooltip .tooltip-rule {
  color: var(--text-muted);
}

/* Gutter pulse for "fix applied" feedback */
.demo-gutter-pulse {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent-teal);
  opacity: 0;
  border-radius: 0 2px 2px 0;
}

.demo-gutter-pulse.is-visible {
  animation: gutterFlash 0.8s ease-out forwards;
}

@keyframes gutterFlash {
  0% {
    opacity: 0.9;
  }
  100% {
    opacity: 0;
  }
}

/* Type hint annotation */
.demo-type-hint {
  color: var(--accent-teal);
  opacity: 0.5;
  font-style: italic;
  display: inline;
  visibility: hidden;
  transition: visibility 0s, opacity 0.4s ease-in-out;
}

.demo-type-hint.is-visible {
  visibility: visible;
  opacity: 0.5;
}

/* Caption below the code area */
.demo-caption {
  padding: 12px 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  border-top: 1px solid var(--border-subtle);
  min-height: 44px;
  transition: opacity 0.3s ease-in-out;
}

.demo-caption code {
  color: var(--accent-teal);
  background: rgba(45, 212, 168, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-size: 0.82em;
}

/* Step indicator dots */
.demo-steps {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 0 20px 14px;
}

.demo-step {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: var(--bg-elevated);
  cursor: pointer;
  padding: 0;
  transition: background 0.2s, transform 0.2s;
}

.demo-step:hover {
  background: var(--text-muted);
}

.demo-step.is-active {
  background: var(--accent-teal);
  transform: scale(1.3);
}

/* ── Footer ──────────────────────────────────────────────── */

.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
  list-style: none;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--accent-teal);
}

.footer p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ── Walkthrough Steps ──────────────────────────────────── */

.walkthrough-heading {
  text-align: center;
  margin-bottom: 48px;
}

.step {
  margin-bottom: 40px;
  padding-left: 20px;
  border-left: 2px solid var(--border-subtle);
}

.step-highlight {
  border-left-color: var(--accent-teal);
  background: rgba(45, 212, 168, 0.03);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 20px 20px 20px;
  margin-left: 0;
}

.step-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}

.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.step-highlight .step-num {
  background: var(--accent-teal);
  border-color: var(--accent-teal);
  color: var(--bg-deep);
}

.step-num-lint {
  background: rgba(229, 168, 75, 0.15);
  border-color: var(--accent-amber);
  color: var(--accent-amber);
  font-size: 1rem;
}

.step-highlight .step-num-lint {
  background: var(--accent-amber);
  color: var(--bg-deep);
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 4px;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

.step .code-block {
  margin: 0 0 8px;
}

.step-footnote {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.step-footnote code {
  color: var(--accent-teal);
  background: rgba(45, 212, 168, 0.08);
}

.walkthrough-done {
  text-align: center;
  padding: 28px 24px;
  background: rgba(45, 212, 168, 0.05);
  border: 1px solid rgba(45, 212, 168, 0.15);
  border-radius: var(--radius-md);
  margin-top: 48px;
}

.walkthrough-done p {
  font-size: 1.05rem;
  margin: 0;
  color: var(--text-primary);
}

.walkthrough-done strong {
  color: var(--accent-teal);
}

.walkthrough-done-sub {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 10px 0 0;
}

/* ── Two-path layout ───────────────────────────────────── */

.paths {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.path-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
}

.path-card-advanced {
  border-color: var(--border-accent);
}

.path-badge {
  display: inline-block;
  width: fit-content;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  margin-bottom: 12px;
}

.path-badge-advanced {
  background: rgba(45, 212, 168, 0.1);
  color: var(--accent-teal);
}

.path-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.path-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0 0 16px;
  line-height: 1.5;
}

.path-card .code-block {
  margin: 0 0 16px;
}

.path-card .code-block code {
  font-size: 0.82rem;
}

.path-features {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}

.path-features li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 4px 0 4px 20px;
  position: relative;
}

.path-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-teal);
  font-weight: 700;
}

.path-features code {
  font-size: 0.82em;
  color: var(--accent-teal);
  background: rgba(45, 212, 168, 0.08);
}

/* ── Lint scenarios (compact) ──────────────────────────── */

.lint-scenarios {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.lint-scenario {
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.lint-scenario-header {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 10px;
}

.lint-icon {
  color: var(--accent-amber);
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.lint-scenario-header strong {
  display: block;
  font-size: 0.92rem;
  margin-bottom: 2px;
}

.lint-rule {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.lint-scenario p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

.lint-scenario code {
  font-size: 0.82em;
}

/* ── Playground ────────────────────────────────────────── */

.playground-section {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  padding: 20px 0;
}

.playground-text h2 {
  margin-bottom: 12px;
}

.playground-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 520px;
  margin: 0 auto 24px;
  line-height: 1.6;
}

.playground-text .btn {
  margin: 0 6px 10px;
}

.playground-text .btn svg {
  flex-shrink: 0;
}

.playground-embed {
  width: 100%;
  margin-top: 24px;
}

.playground-embed iframe {
  border: 1px solid var(--border-subtle);
}

/* ── Stratum inline code ────────────────────────────────── */

.stratum-code {
  display: block;
  margin-top: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--accent-teal);
  opacity: 0.7;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── CTA section ────────────────────────────────────────── */

.cta-section {
  text-align: center;
  padding: 60px 0;
  background: var(--bg-surface);
}

.cta-section h2 {
  margin-bottom: 24px;
}

.cta-install {
  display: inline-block;
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 28px;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
}

/* ── Responsive: 980px ───────────────────────────────────── */

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-sub {
    max-width: none;
  }

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

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

  .lint-scenarios {
    grid-template-columns: 1fr;
  }

  .comparison table {
    min-width: 580px;
  }

  .section {
    padding: 60px 0;
  }

  .step-highlight {
    padding: 16px;
  }
}

/* ── Responsive: 768px ───────────────────────────────────── */

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.4rem;
  }

  .hero {
    padding-top: calc(var(--nav-height) + 32px);
    padding-bottom: 40px;
  }

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

  .section {
    padding: 48px 0;
  }

  /* Nav mobile */
  .nav-hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: -1rem;
    right: -1rem;
    flex-direction: column;
    gap: 0;
    background: rgba(14, 17, 23, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 8px 0;
  }

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

  .nav-links li {
    list-style: none;
  }

  .nav-links a {
    display: block;
    padding: 12px 24px;
    font-size: 0.9rem;
  }

  .nav-links a:hover {
    background: rgba(45, 212, 168, 0.06);
  }

  /* Demo editor */
  .demo-editor {
    min-height: 280px;
  }

  .demo-line {
    font-size: 0.72rem;
    gap: 0.5rem;
    padding: 0 0.75rem;
  }

  .demo-tooltip {
    font-size: 0.65rem;
    white-space: normal;
    max-width: calc(100% - 4rem);
    left: 2.5rem;
    right: 0.75rem;
  }

  /* Code blocks */
  .code-block {
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
  }

  .code-line {
    padding: 0 0.85rem;
  }

  /* Buttons */
  .btn {
    padding: 0.65rem 1.2rem;
    font-size: 0.88rem;
  }

  /* Install picker */
  .install-tabs {
    flex-wrap: wrap;
  }

  .install-cmd code {
    font-size: 0.8rem;
  }

  /* Strata */
  .stratum {
    padding: 1.25rem 1.25rem 1.25rem 1.5rem;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
}

/* ── Reduced motion ──────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}