:root {
  --ink: #0a0a0a;
  --ink-soft: #3a3a3a;
  --paper: #ffffff;
  --paper-2: #f6f6f6;
  --line: #e6e6e6;
  --accent: #0a0a0a;
  --accent-2: #2e2e2e;
  --muted: #6a6a6a;
  --faint: #9a9a9a;
  --white: #ffffff;

  --radius: 2px;
  --radius-md: 4px;

  --font-display: "Switzer", "Noto Sans TC", sans-serif;
  --font-body: "Noto Sans TC", "Switzer", sans-serif;
  --font-serif: var(--font-display);
  --font-sans: var(--font-body);

  --text-xs: 0.6875rem;
  --text-sm: 0.8125rem;
  --text-base: 1rem;
  --text-md: 1.0625rem;
  --text-lg: 1.125rem;
  --text-xl: clamp(1.35rem, 2.2vw, 1.7rem);
  --text-2xl: clamp(1.65rem, 3vw, 2.25rem);
  --text-3xl: clamp(2rem, 4.2vw, 3rem);
  --text-4xl: clamp(2.5rem, 5.5vw, 4.5rem);

  --leading-tight: 1.08;
  --leading-snug: 1.32;
  --leading-body: 1.7;

  --tracking-display: -0.035em;
  --tracking-tight: -0.02em;
  --tracking-label: 0.14em;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 160ms;
  --duration: 320ms;
  --duration-slow: 560ms;
  --transition: var(--duration) var(--ease);
  --transition-fast: var(--duration-fast) var(--ease);
  --transition-slow: var(--duration-slow) var(--ease);

  --space-section: clamp(4.5rem, 9vw, 7.5rem);
  --wrap: min(1080px, calc(100% - 3rem));
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.08);

  /* Legacy aliases used by home-sections.css */
  --color-text: var(--ink);
  --color-text-muted: var(--muted);
  --color-text-faint: var(--faint);
  --color-bg: var(--paper);
  --color-surface: var(--paper-2);
  --color-surface-2: #efefef;
  --color-border: var(--line);
  --content-default: 1080px;

  color-scheme: light;
}

[data-theme="dark"] {
  --ink: #f2f2f2;
  --ink-soft: #c8c8c8;
  --paper: #080808;
  --paper-2: #111111;
  --line: #262626;
  --accent: #f2f2f2;
  --accent-2: #c8c8c8;
  --muted: #8e8e8e;
  --faint: #6a6a6a;
  --white: #111111;
  --color-surface-2: #1a1a1a;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 10px 32px rgba(0, 0, 0, 0.45);

  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--ink);
  background: var(--paper);
  line-height: var(--leading-body);
  letter-spacing: 0.01em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition:
    background-color var(--transition),
    color var(--transition);
}
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-snug);
  color: var(--ink);
  text-wrap: balance;
}
a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color var(--transition-fast);
}
a:hover { color: var(--accent-2); }
.wrap { width: var(--wrap); margin-inline: auto; }
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--white); padding: 0.5rem 1rem; z-index: 1000;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  border-bottom: 1px solid var(--line);
  transition: background-color var(--transition), border-color var(--transition);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 4.25rem;
}
.brand {
  display: inline-flex; flex-direction: row; align-items: center; gap: 0.75rem;
  text-decoration: none; color: inherit;
  transition: opacity var(--transition-fast);
}
.brand:hover { opacity: 0.72; color: inherit; }
.brand__mark { flex: 0 0 auto; }
.brand__copy { display: flex; flex-direction: column; gap: 0.08rem; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 600; font-size: 0.98rem; letter-spacing: -0.02em; line-height: 1.1;
}
.brand__tag {
  font-family: var(--font-body);
  font-size: 0.62rem; font-weight: 500; color: var(--muted);
  letter-spacing: var(--tracking-label); text-transform: uppercase;
}
.nav-wrap { display: flex; align-items: center; gap: 1rem; }
.site-nav { display: flex; flex-wrap: wrap; gap: 0.85rem 1.2rem; align-items: center; }
.site-nav a {
  position: relative;
  color: var(--ink-soft);
  text-decoration: none;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
  padding: 0.2rem 0;
  transition: color var(--transition-fast);
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -0.15rem;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a:hover,
.site-nav a[aria-current="page"] { color: var(--ink); }
.nav-toggle {
  display: none; border: 1px solid var(--line); background: var(--white);
  padding: 0.45rem 0.75rem; border-radius: var(--radius); font: inherit;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.4rem; padding: 0.72rem 1.2rem; border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none; border: 1px solid transparent;
  transition:
    transform var(--transition),
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--ink); color: var(--white); border-color: var(--ink); }
.btn--primary:hover { background: var(--accent-2); border-color: var(--accent-2); color: var(--white); }
.btn--ghost { background: transparent; border-color: var(--ink); color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--white); }

.btn--accent { background: var(--accent-2); color: var(--white); }

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: 0;
  background: var(--paper);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.hero-video-iframe {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: calc(177.78vh + 240px);
  min-width: calc(100% + 240px);
  height: calc(56.25vw + 240px);
  min-height: calc(100% + 240px);
  border: none;
  opacity: 0.13;
  filter: grayscale(60%);
  pointer-events: none;
}
.hero-video-blocker {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: transparent;
  pointer-events: auto;
}
.hero-video-fade {
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    linear-gradient(to bottom, var(--paper) 0%, transparent 30%),
    linear-gradient(to top, var(--paper) 0%, transparent 30%),
    linear-gradient(to right, var(--paper) 0%, transparent 20%),
    linear-gradient(to left, var(--paper) 0%, transparent 20%);
  pointer-events: none;
}
.grid-overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, #000 30%, transparent 100%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 4;
  padding-block: clamp(5rem, 12vw, 8rem);
  max-width: 800px;
  color: var(--ink);
}
.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  width: fit-content;
  background: color-mix(in srgb, var(--paper) 80%, transparent);
}
.dot {
  width: 6px;
  height: 6px;
  background: var(--ink);
  border-radius: 50%;
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.28; }
}
.hero-headline {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 400;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-tight);
  margin: 0 0 1.75rem;
  color: var(--ink);
  max-width: none;
  animation: none;
}
.hero-sub {
  font-family: var(--font-body);
  font-size: clamp(1.05rem, 1rem + 0.55vw, 1.3rem);
  font-weight: 400;
  color: var(--muted);
  line-height: 1.65;
  letter-spacing: 0.01em;
  max-width: 34rem;
  margin: 0 0 2.25rem;
  animation: none;
}
.hero-cta {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
  animation: none;
}
.hero-cta .btn-lg {
  padding: 0.9rem 1.35rem;
  font-size: var(--text-sm);
}
.hero-platforms {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.platform-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.platform-list {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.platform-list .divider {
  color: color-mix(in srgb, var(--muted) 70%, transparent);
  font-weight: 300;
}
.platform-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}
.platform-item:hover { color: var(--ink); }
.platform-logo {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  opacity: 0.75;
  transition: opacity var(--transition-fast);
}
.platform-item:hover .platform-logo { opacity: 1; }

/* Homepage hero uses restored .hero-bg / .hero-content system */

@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}

.section {
  position: relative;
  padding: var(--space-section) 0;
}
.section--soft {
  background: var(--paper-2);
  border-block: 1px solid var(--line);
}
.section__eyebrow {
  margin: 0 0 0.55rem;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.section__head { max-width: 40rem; margin-bottom: 2rem; }
.section__head h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-display);
  margin: 0 0 0.75rem;
}
.section__lead {
  margin: 0;
  color: var(--muted);
  font-size: var(--text-md);
  line-height: var(--leading-body);
}

.answer {
  border-left: 3px solid var(--accent);
  padding: 0.85rem 1rem; margin: 0 0 1.5rem;
  background: var(--paper-2);
  font-size: 1.05rem;
}
.def-box {
  border: 1px solid var(--line);
  background: var(--white);
  padding: 1.25rem 1.4rem; border-radius: var(--radius); margin: 1.25rem 0;
}
.def-box strong { display: block; margin-bottom: 0.35rem; font-family: var(--font-display); font-weight: 500; }

.prose { max-width: 64rem; }
.prose > p, .prose > ul, .prose > ol { max-width: 48rem; }
.prose h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  margin: 2.4rem 0 0.8rem;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
}
.prose h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  margin: 1.7rem 0 0.5rem;
  letter-spacing: var(--tracking-tight);
}
.prose p, .prose li { color: var(--ink-soft); line-height: var(--leading-body); }
.prose ul { padding-left: 1.2rem; }
.prose table {
  width: 100%; border-collapse: collapse; font-size: var(--text-sm); margin: 1.25rem 0;
  background: var(--white);
}
.prose th, .prose td {
  border: 1px solid var(--line); padding: 0.7rem 0.8rem; text-align: left; vertical-align: top;
}
.prose th { background: color-mix(in srgb, var(--ink) 3%, var(--paper)); font-weight: 500; }

.faq details {
  border-top: 1px solid var(--line); padding: 1rem 0;
  transition: background-color var(--transition-fast);
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-md);
  letter-spacing: var(--tracking-tight);
  list-style: none;
  transition: color var(--transition-fast);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--ink-soft); }
.faq details p { margin: 0.65rem 0 0; color: var(--muted); line-height: var(--leading-body); }

.cta-band {
  position: relative;
  margin: 2.5rem 0 0; padding: 1.65rem 1.75rem;
  background: var(--ink);
  color: var(--white); border-radius: var(--radius);
  display: flex; flex-wrap: wrap; gap: 1.25rem; align-items: center; justify-content: space-between;
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band p {
  margin: 0; max-width: 38ch;
  color: color-mix(in srgb, var(--white) 82%, transparent);
  font-size: var(--text-md);
  line-height: 1.55;
}
.cta-band .btn--primary { background: var(--white); color: var(--ink); border-color: var(--white); }
.cta-band .btn--primary:hover { background: color-mix(in srgb, var(--white) 90%, transparent); }

.page-hero {
  position: relative;
  padding: clamp(3.25rem, 7vw, 4.5rem) 0 2rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.page-hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 500;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-display);
  margin: 0.35rem 0 0.85rem;
  max-width: 18ch;
}
.page-hero .lead {
  margin: 0; max-width: 40rem; color: var(--muted);
  font-size: var(--text-md); line-height: var(--leading-body);
}

.guide-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px; padding: 1px; background: var(--line);
}
.guide-card {
  display: block; text-decoration: none; color: inherit;
  background: var(--white); border: 0;
  padding: 1.3rem 1.35rem; border-radius: 0;
  transition:
    background-color var(--transition),
    transform var(--transition),
    color var(--transition);
}
.guide-card:hover { background: var(--paper-2); transform: translateY(-2px); color: inherit; }
.guide-card h3 {
  margin: 0 0 0.45rem; font-size: 1.05rem;
  font-family: var(--font-display); font-weight: 500; letter-spacing: var(--tracking-tight);
}
.guide-card p { margin: 0; color: var(--muted); font-size: var(--text-sm); line-height: 1.55; }

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 1.5rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.metric {
  display: grid;
  gap: 0.35rem;
  padding: 1.25rem;
  background: var(--white);
}
.metric:nth-child(even) {
  background: var(--paper-2);
}
.metric-card {
  display: grid;
  gap: 0.35rem;
  padding: 1.25rem;
  background: var(--white);
  border: 1px solid var(--line);
}
.metric-card strong {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  line-height: 1;
  letter-spacing: var(--tracking-display);
  color: var(--accent);
}
.metric-card span { color: var(--muted); font-size: var(--text-sm); }
.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}
.lede {
  font-size: var(--text-md);
  color: var(--ink-soft);
  max-width: 48rem;
  line-height: var(--leading-body);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1.2rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition:
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition),
    transform var(--transition);
}
.button:hover {
  background: var(--accent-2);
  border-color: var(--accent-2);
  color: var(--white);
  transform: translateY(-1px);
}
.button--outline { background: transparent; color: var(--ink); }
.button--outline:hover { background: var(--ink); color: var(--white); }
.platform-card, .engine-card {
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  background: var(--white);
}
.platform-card h3, .engine-card h3 {
  margin: 0.25rem 0;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
}
.platform-card__rank, .platform-card__category, .platform-card__engines {
  color: var(--muted);
  font-size: 0.8rem;
}
.platform-card__figure { margin: 0.35rem 0; color: var(--accent); font-size: 1.35rem; font-weight: 500; }
.how-table-wrap { overflow-x: auto; margin: 1.25rem 0; }
.how-table { width: 100%; border-collapse: collapse; background: var(--white); }
.how-table th, .how-table td { padding: 0.7rem; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.metric strong {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  line-height: 1;
  letter-spacing: var(--tracking-display);
  color: var(--accent);
}
.metric span { color: var(--muted); font-size: var(--text-sm); }
.source-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1.2rem 0;
}
.source-strip span {
  padding: 0.5rem 0.75rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.86rem;
}
.data-note, .data-caption {
  color: var(--muted);
  font-size: 0.88rem;
}
.data-note {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: var(--paper-2);
  margin: 1rem 0 1.5rem;
}
.method-grid, .engine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1px;
  margin: 1.5rem 0;
  padding: 1px;
  background: var(--line);
}
.method-grid > div, .engine-grid > section, .engine-grid > article {
  padding: 1.15rem;
  border: 0;
  border-top: 2px solid var(--accent);
  background: var(--white);
}
.method-grid span {
  color: var(--muted);
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
}
.method-grid h3, .engine-grid h3 {
  margin: 0.45rem 0;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
}
.method-grid p, .engine-grid p, .engine-grid li { color: var(--muted); font-size: 0.9rem; }
.engine-grid ol { padding-left: 1.2rem; }
.source-table td:first-child { white-space: nowrap; }

.site-footer {
  position: relative;
  margin-top: 0;
  padding: var(--space-section) 0 2rem;
  background: var(--paper-2);
  color: var(--muted);
  border-top: 1px solid var(--line);
}
.site-footer a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.site-footer a:hover { color: var(--ink); }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; margin-bottom: 2.5rem;
}
.footer-brand {
  display: inline-flex; align-items: center; gap: 0.65rem;
  font-family: var(--font-display); font-size: 1rem; font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink); margin: 0 0 0.75rem; text-decoration: none;
  transition: opacity var(--transition-fast);
}
.footer-brand:hover { opacity: 0.72; color: var(--ink); }
.footer-tagline {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}
.footer-col h3 {
  margin: 0 0 0.85rem;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin: 0.45rem 0; font-size: var(--text-sm); }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 1.15rem; display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem;
  justify-content: space-between; font-size: var(--text-sm);
}
.footer-bottom__end { display: flex; align-items: center; gap: 1rem; }
.theme-toggle {
  width: 30px; height: 30px; display: inline-flex; align-items: center; justify-content: center;
  padding: 0; color: var(--muted); background: transparent; border: 1px solid var(--line);
  border-radius: 50%; cursor: pointer;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition);
}
.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--ink-soft);
  transform: rotate(12deg);
}
.theme-toggle__sun { display: none; }
[data-theme="dark"] .theme-toggle__sun { display: block; }
[data-theme="dark"] .theme-toggle__moon { display: none; }
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
  will-change: opacity, transform;
}
.reveal.is-in { opacity: 1; transform: none; }

.form {
  display: grid; gap: 0.85rem; max-width: 32rem;
  background: var(--white); border: 1px solid var(--line); padding: 1.4rem; border-radius: var(--radius);
}
.form label { display: grid; gap: 0.3rem; font-weight: 600; font-size: 0.92rem; }
.form input, .form textarea, .form select {
  font: inherit; padding: 0.7rem 0.8rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper); color: var(--ink);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form input:focus, .form textarea:focus, .form select:focus {
  outline: none;
  border-color: var(--ink-soft);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ink) 8%, transparent);
}
.form button { justify-self: start; }
.form__msg { padding: 0.75rem 0.9rem; border-radius: var(--radius); background: var(--paper-2); }
.form__msg--err { border-left: 2px solid var(--ink); }


.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: start;
}
.form-card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.5rem;
  border-radius: var(--radius);
}
.audit-form { display: grid; gap: 0.9rem; }
.audit-form label { display: grid; gap: 0.35rem; font-weight: 600; font-size: 0.92rem; }
.audit-form input, .audit-form textarea {
  font: inherit; padding: 0.7rem 0.8rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper); color: var(--ink);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.audit-form input:focus, .audit-form textarea:focus {
  outline: none;
  border-color: var(--ink-soft);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ink) 8%, transparent);
}
.form-note { font-size: 0.88rem; color: var(--muted); margin: 0; }
.form-success {
  background: var(--paper-2); border: 1px solid var(--line);
  padding: 0.85rem 1rem; border-radius: var(--radius);
}
.faq-list { display: grid; gap: 0.65rem; margin-top: 1rem; }
.faq-item {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 0.95rem 1.1rem;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}
.faq-item[open] { border-color: var(--ink-soft); }
.faq-item summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p { margin: 0.65rem 0 0; color: var(--muted); line-height: var(--leading-body); }
.page-hero .hero__lead {
  margin: 0; max-width: 40rem; color: var(--muted);
  font-size: var(--text-md); line-height: var(--leading-body);
}

/* Restored page-specific visual system */
.platforms-hero,
.how-hero {
  position: relative;
  padding-block: clamp(5.5rem, 10vw, 8rem);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.platforms-hero h1,
.how-hero h1 {
  max-width: 17ch;
  margin: 0 0 1.5rem;
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 400;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-display);
}
.platforms-hero .lede,
.how-hero .lede {
  max-width: 680px;
  font-size: var(--text-lg);
  color: var(--muted);
  line-height: var(--leading-body);
}
.platforms-hero__metrics { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.platforms-ranking { position: relative; }
.platform-card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; padding: 1px; background: var(--line); }
.platform-card {
  min-height: 255px;
  display: flex;
  flex-direction: column;
  padding: 1.4rem;
  border: 0;
  background: var(--white);
}
.platform-card--top { border-top: 3px solid var(--ink); }
.platform-card--highlight {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.platform-card--highlight h3,
.platform-card--highlight p,
.platform-card--highlight .platform-card__rank,
.platform-card--highlight .platform-card__category,
.platform-card--highlight .platform-card__engines,
.platform-card--highlight .platform-card__figure { color: inherit; }
.platform-card__engines { margin-top: auto; padding-top: 1rem; border-top: 1px solid var(--line); }
.platforms-engines .engine-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.platforms-steps {
  counter-reset: platform-step; display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; margin: 2rem 0; padding: 1px; list-style: none; background: rgba(255,255,255,0.2);
}
.platforms-steps li { padding: 1.35rem; background: #141414; }
.platforms-steps strong { display: block; margin-bottom: 0.5rem; color: #fff; }
.platforms-steps p { margin: 0; color: rgba(255,255,255,0.68); font-size: 0.9rem; }
.platforms-cta,
.how-final {
  position: relative;
  display: block; margin: 0; padding-block: 5rem; border: 0; border-radius: 0;
  background: #0a0a0a;
  color: #ffffff;
}
.platforms-cta .eyebrow,
.platforms-cta h2,
.platforms-cta p,
.how-final h2,
.how-final p { color: inherit; }
.platforms-cta .button,
.how-final .button { background: #fff; border-color: #fff; color: #0a0a0a; }
.how-final .button--outline { background: transparent; color: #fff; border-color: rgba(255,255,255,0.5); }

.how-hero__tags {
  display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 2rem 0 0; padding: 0; list-style: none;
}
.how-hero__tags li {
  padding: 0.45rem 0.7rem; border: 1px solid var(--line);
  color: var(--muted); font-size: 0.78rem; letter-spacing: 0.03em;
}
.how-failures {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px; margin: 2rem 0; padding: 1px; list-style: none; background: var(--line);
}
.how-failures li { position: relative; padding: 1.1rem 1.1rem 1.1rem 2.8rem; background: var(--white); }
.how-failures li::before { content: "×"; position: absolute; left: 1.1rem; color: var(--muted); font-weight: 700; }
.how-problem { position: relative; }
.how-audit-teaser { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.how-layer { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.how-layer::before {
  position: absolute; right: clamp(1rem, 5vw, 4rem); top: 1.5rem;
  font-family: var(--font-display); font-size: clamp(5rem, 12vw, 10rem);
  line-height: 1; font-weight: 500; color: var(--line); pointer-events: none;
  letter-spacing: var(--tracking-display);
}
.how-layer--access::before { content: "01"; }
.how-layer--trust::before { content: "02"; }
.how-layer--extraction::before { content: "03"; }
.how-layer--evidence::before { content: "04"; }
.how-layer header { margin-bottom: 2rem; }
.how-signals,
.how-extraction-checks,
.how-audit-layers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: var(--line);
}
.how-signals > article,
.how-extraction-checks > article,
.how-audit-layers > article {
  padding: 1.35rem; border: 0;
  background: var(--white);
}
.how-extraction-checks h4 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
}
.how-audit { padding-block: clamp(5rem, 9vw, 7rem); }
.how-audit-layer__number {
  margin: 0 0 0.5rem; color: var(--muted); font-size: var(--text-xs);
  font-weight: 500; letter-spacing: var(--tracking-label); text-transform: uppercase;
}
.how-audit-layers ul { padding-left: 1.1rem; color: var(--muted); font-size: 0.86rem; }
.how-final__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.5rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
  .dot { animation: none; }
  .hero-video-iframe { display: none; }
}

@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; }
  .metric-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none; position: absolute; right: 1.25rem; top: 4.1rem;
    flex-direction: column; align-items: stretch;
    background: var(--white); border: 1px solid var(--line);
    padding: 0.85rem 1rem; border-radius: var(--radius); min-width: 12rem;
  }
  .site-nav.is-open { display: flex; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .platform-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .platforms-engines .engine-grid,
  .how-signals,
  .how-extraction-checks,
  .how-audit-layers { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .metric-grid { grid-template-columns: 1fr; }
  .prose table { display: block; overflow-x: auto; }
  :root { --wrap: min(100% - 2rem, 1080px); }
  .brand__tag { display: none; }
  .brand__mark { width: 28px; height: 28px; }
  .nav-wrap { gap: 0.5rem; }
  .nav-wrap > .btn { display: none; }
  .platform-card-grid,
  .platforms-steps,
  .how-failures { grid-template-columns: 1fr; }
}