/* =============================================================================
   PERFORMANCE CASE STUDY — styles.css
   Deep navy + electric amber palette
   Mobile-first, WCAG AA, no hardcoded colors outside :root
   ============================================================================= */

/* ─── 1. Custom Properties ─────────────────────────────────────────────────── */
:root {
  /* Color palette */
  --color-bg:         #060B18;
  --color-surface:    #0C1628;
  --color-surface-2:  #112240;
  --color-border:     #1E3A5F;
  --color-text:       #E8F0FE;
  --color-text-muted: #8BA4C2;
  --color-accent:     #F5A623;
  --color-accent-dim: rgba(245, 166, 35, 0.15);
  --color-bad:        #FF4757;
  --color-good:       #2ED573;
  --color-medium:     #FFA502;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;

  /* Spacing (8px base) */
  --space-1:  0.5rem;
  --space-2:  1rem;
  --space-3:  1.5rem;
  --space-4:  2rem;
  --space-6:  3rem;
  --space-8:  4rem;
  --space-12: 6rem;

  /* Layout */
  --container-max: 72rem;
  --radius-sm:     0.25rem;
  --radius-md:     0.5rem;
  --radius-lg:     1rem;

  /* Animation */
  --transition-fast:   150ms ease;
  --transition-normal: 300ms ease;
}

/* ─── 2. Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ─── 3. Base Typography ────────────────────────────────────────────────────── */
h1, h2, h3 {
  line-height: 1.2;
  margin-block: 0;
  font-weight: 700;
}

p {
  margin-block: 0;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration: none;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.35em;
}

/* ─── 4. Utilities ──────────────────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.section {
  padding-block: var(--space-12);
}

.section-alt {
  background-color: var(--color-surface);
}

/* ─── 5. Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.625rem var(--space-3);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-bg); /* ~7.5:1 contrast ratio — exceeds WCAG AA */
}

.btn-primary:hover {
  background-color: color-mix(in srgb, var(--color-accent) 82%, #fff);
  color: var(--color-bg);
}

.btn-secondary {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: transparent;
}

.btn-secondary:hover {
  background-color: var(--color-accent-dim);
}

/* ─── 6. Skip Link ──────────────────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  inset-block-start: var(--space-2);
  inset-inline-start: -9999px;
  background-color: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  z-index: 1000;
  text-decoration: none;
}

.skip-link:focus {
  inset-inline-start: var(--space-2);
}

/* ─── 7. Site Header / Nav ──────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(6, 11, 24, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
  padding-block: var(--space-2);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.nav-brand:hover {
  color: var(--color-accent);
}

.nav-brand svg {
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding-block: 0.25rem;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-accent);
}

.nav-links a[aria-current="page"] {
  font-weight: 600;
}

.nav-links a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Hamburger button */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── 8. Hero ───────────────────────────────────────────────────────────────── */
.hero {
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-8);
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-12) var(--space-4);
}

.hero-eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-block-end: var(--space-2);
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  letter-spacing: -0.03em;
  margin-block-end: var(--space-2);
  color: var(--color-text);
}

.hero-subhead {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  color: var(--color-text-muted);
  margin-block-end: var(--space-3);
}

.score-bad  { color: var(--color-bad);  font-weight: 700; }
.score-good { color: var(--color-good); font-weight: 700; }

.hero-description {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-block-end: var(--space-4);
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* Decorative delta counter */
.hero-score-delta {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  background: var(--color-accent-dim);
  flex-shrink: 0;
}

.delta-number {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent);
}

.delta-number::before {
  content: '+';
}

.delta-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-block-start: 0.25rem;
}

/* ─── 9. Section: Overview ──────────────────────────────────────────────────── */
.section-heading {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  letter-spacing: -0.02em;
  margin-block-end: var(--space-2);
}

.section-subhead {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  margin-block-end: var(--space-6);
  max-width: 60ch;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-3);
}

.overview-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.overview-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-block-end: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8125rem;
}

.overview-card p,
.overview-card li {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.overview-card ul {
  margin: 0;
  padding-inline-start: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ─── 10. Section: Audit Findings ───────────────────────────────────────────── */
.findings-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  counter-reset: findings;
}

.finding-item {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2) var(--space-3);
  align-items: start;
  transition: border-color var(--transition-normal);
}

.finding-item:hover {
  border-color: var(--color-text-muted);
}

.finding-header {
  display: contents;
}

.severity-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25em 0.65em;
  border-radius: 100vmax;
  white-space: nowrap;
  align-self: start;
  justify-self: start;
  margin-block-start: 0.2rem;
}

[data-severity="critical"] {
  background: rgba(255, 71, 87, 0.15);
  color: var(--color-bad);
  border: 1px solid rgba(255, 71, 87, 0.35);
}

[data-severity="major"] {
  background: rgba(255, 165, 2, 0.15);
  color: var(--color-medium);
  border: 1px solid rgba(255, 165, 2, 0.35);
}

[data-severity="minor"] {
  background: rgba(139, 164, 194, 0.15);
  color: var(--color-text-muted);
  border: 1px solid rgba(139, 164, 194, 0.35);
}

.finding-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-block-end: 0.4rem;
}

.finding-item p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  grid-column: 2;
}

/* ─── 11. Section: Optimizations ────────────────────────────────────────────── */
.optimizations-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.optimization-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.optimization-card:hover {
  border-color: var(--color-accent);
}

.opt-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-4) 0;
  flex-wrap: wrap;
}

.opt-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  opacity: 0.7;
  min-width: 2.5ch;
}

.opt-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  flex: 1;
}

.opt-impact {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-good);
  background: rgba(46, 213, 115, 0.1);
  border: 1px solid rgba(46, 213, 115, 0.25);
  border-radius: 100vmax;
  padding: 0.2em 0.75em;
  white-space: nowrap;
}

.opt-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
}

.opt-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-block-end: 0.5rem;
}

.opt-label--bad  { color: var(--color-bad); }
.opt-label--good { color: var(--color-good); }

.opt-problem p,
.opt-solution p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

/* Code diff blocks */
.code-diff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  padding: 0 var(--space-4) var(--space-4);
}

.diff-block {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.diff-block--bad  {
  border-inline-start: 4px solid var(--color-bad);
  background: rgba(255, 71, 87, 0.06);
}

.diff-block--good {
  border-inline-start: 4px solid var(--color-good);
  background: rgba(46, 213, 115, 0.06);
}

.diff-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.5rem var(--space-2) 0;
  margin: 0;
}

.diff-block--bad  .diff-label { color: var(--color-bad); }
.diff-block--good .diff-label { color: var(--color-good); }

.diff-block pre {
  margin: 0;
  padding: 0.5rem var(--space-2) var(--space-2);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--color-text);
  tab-size: 2;
}

.diff-block pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

/* ─── 12. Section: Results (Lighthouse Gauges) ──────────────────────────────── */
.results-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

.results-col h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-block-end: var(--space-4);
  padding-block-end: var(--space-2);
  border-block-end: 1px solid var(--color-border);
}

.results-col--bad  h3 { color: var(--color-bad); }
.results-col--good h3 { color: var(--color-good); }

.gauges-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.gauge-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.gauge-svg {
  width: 100%;
  max-width: 120px;
}

.gauge-track {
  fill: none;
  stroke: var(--color-surface-2);
  stroke-width: 10;
}

.gauge-arc {
  fill: none;
  stroke-width: 10;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 60px 60px; /* % unreliable on SVG in iOS Safari */
}

.gauge-arc--bad    { stroke: var(--color-bad); }
.gauge-arc--medium { stroke: var(--color-medium); }
.gauge-arc--good   { stroke: var(--color-good); }

.gauge-figure figcaption {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.gauge-score {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  font-feature-settings: 'tnum';
}

.gauge-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: center;
  font-weight: 500;
}

/* ─── 13. Section: Core Web Vitals Table ────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.table-wrapper:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

thead th {
  background: var(--color-surface-2);
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-block-end: 1px solid var(--color-border);
}

tbody tr:not(:last-child) td,
tbody tr:not(:last-child) th {
  border-block-end: 1px solid var(--color-border);
}

tbody tr:hover {
  background: var(--color-surface-2);
}

td, tbody th {
  padding: var(--space-2) var(--space-3);
  text-align: left;
}

tbody th {
  font-weight: 500;
  color: var(--color-text);
}

tbody th small {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-block-start: 0.2rem;
}

.metric-bad         { color: var(--color-bad);    font-weight: 600; }
.metric-good        { color: var(--color-good);   font-weight: 600; }
.metric-improvement { color: var(--color-accent); font-weight: 700; font-family: var(--font-mono); }

/* ─── 14. Section: Try It (Demo Cards) ─────────────────────────────────────── */
.demo-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.demo-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: border-color var(--transition-normal);
}

.demo-card--bad:hover  { border-color: var(--color-bad); }
.demo-card--good:hover { border-color: var(--color-good); }

.demo-card-score {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1;
}

.demo-card--bad  .demo-card-score { color: var(--color-bad); }
.demo-card--good .demo-card-score { color: var(--color-good); }

.demo-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.demo-issues,
.demo-wins {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.demo-issues li,
.demo-wins li {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  padding-inline-start: 1.25rem;
  position: relative;
}

.demo-issues li::before {
  content: '✗';
  position: absolute;
  inset-inline-start: 0;
  color: var(--color-bad);
  font-weight: 700;
  font-size: 0.875rem;
}

.demo-wins li::before {
  content: '✓';
  position: absolute;
  inset-inline-start: 0;
  color: var(--color-good);
  font-weight: 700;
  font-size: 0.875rem;
}

/* ─── 15. Section: Tools ────────────────────────────────────────────────────── */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-3);
}

.tool-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
}

.tool-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-block-end: 0.5rem;
}

.tool-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.tool-badge {
  display: block;
  width: fit-content;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-good);
  background: rgba(46, 213, 115, 0.1);
  border: 1px solid rgba(46, 213, 115, 0.25);
  border-radius: 100vmax;
  padding: 0.15em 0.6em;
  margin-block-end: 0.5rem;
}

/* ─── 16. Footer ────────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-surface);
  border-block-start: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-disclaimer {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-nav a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ─── 17. Scroll Reveal ─────────────────────────────────────────────────────── */
.scroll-reveal {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: none;
}

/* ─── 18. Responsive ────────────────────────────────────────────────────────── */

/* 640px — stack code diffs */
@media (max-width: 640px) {
  .container {
    padding-inline: var(--space-3);
  }

  .section {
    padding-block: var(--space-8);
  }

  .hero {
    padding: var(--space-8) var(--space-3);
    min-height: auto;
    padding-block-start: calc(var(--space-8) + 2rem);
  }

  .code-diff,
  .opt-body {
    grid-template-columns: 1fr;
  }

  .demo-cards {
    grid-template-columns: 1fr;
  }
}

/* 768px — collapse nav to hamburger */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-score-delta {
    display: none; /* decorative only, safe to hide */
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    inset-block-start: 100%;
    inset-inline: 0;
    background-color: var(--color-surface);
    border-block-end: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: var(--space-2);
  }

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

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: var(--space-2) var(--space-4);
  }

  .results-columns {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .gauges-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .finding-item {
    grid-template-columns: 1fr;
  }

  .finding-item p {
    grid-column: 1;
  }

  .opt-header {
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "num title"
      ".   badge";
  }
  .opt-number { grid-area: num; }
  .opt-header h3 { grid-area: title; }
  .opt-impact { grid-area: badge; justify-self: start; }
}

/* 480px — gauges wrap */
@media (max-width: 480px) {
  .gauges-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero h1 {
    font-size: 2rem;
  }
}

/* ─── 19. Section: Check Your Site (CrUX Tool) ──────────────────────────────── */
.crux-form {
  max-width: 42rem;
  margin: 0 auto var(--space-6);
}

.crux-input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.crux-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.crux-input-row {
  display: flex;
  gap: var(--space-2);
}

.crux-input {
  flex: 1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.625rem var(--space-2);
  transition: border-color var(--transition-fast);
}

.crux-input::placeholder {
  color: var(--color-text-muted);
}

.crux-input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-color: var(--color-accent);
}

.crux-hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin: 0;
}

.crux-error {
  font-size: 0.875rem;
  color: var(--color-bad);
  margin: 0;
}

/* Results grid */
.crux-results {
  max-width: 42rem;
  margin: 0 auto;
}

.crux-metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.crux-metric-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.crux-metric-name {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.crux-metric-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  font-feature-settings: 'tnum';
  color: var(--color-text);
}

.crux-metric-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
}

.crux-metric-card--good    .crux-metric-badge { background: rgba(46,213,115,0.15); color: var(--color-good); }
.crux-metric-card--needs-improvement .crux-metric-badge { background: rgba(255,165,2,0.15);  color: var(--color-medium); }
.crux-metric-card--poor    .crux-metric-badge { background: rgba(255,71,87,0.15);  color: var(--color-bad); }

.crux-metric-card--good    .crux-metric-value { color: var(--color-good); }
.crux-metric-card--needs-improvement .crux-metric-value { color: var(--color-medium); }
.crux-metric-card--poor    .crux-metric-value { color: var(--color-bad); }

.crux-metric-threshold {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin: 0;
}

.crux-no-data {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-align: center;
  color: var(--color-text-muted);
}

@media (max-width: 600px) {
  .crux-input-row {
    flex-direction: column;
  }

  .crux-submit {
    justify-content: center;
  }

  .crux-metric-grid {
    grid-template-columns: 1fr;
  }
}

/* ─── 20. Reduced Motion ─────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .scroll-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}