html, body { margin: 0; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  background: var(--sv-paper);
  color: var(--sv-pitch);
  font-family: var(--sv-font-body);
  font-size: var(--sv-text-body);
  line-height: 1.55;
  overflow-x: hidden;
}
h1, h2, h3, p { margin: 0; }
h1, h2, h3 {
  font-family: var(--sv-font-display);
  letter-spacing: -0.035em;
}
a { color: inherit; }
.container {
  width: min(1180px, calc(100% - 112px));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--sv-paper) 92%, transparent);
  border-bottom: 1px solid var(--sv-ash);
  backdrop-filter: blur(14px);
}
.nav-row {
  min-height: 98px;
  max-width: 1320px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
}
.nav-brand, .nav-links, .nav-actions, .nav-mark-group {
  display: flex;
  align-items: center;
}
.nav-brand { gap: 38px; }
.nav-links { gap: 26px; }
.nav-actions { gap: 20px; }
.nav-mark-group { gap: 10px; color: var(--sv-pitch); text-decoration: none; }
.nav-mark { width: 22px; height: 22px; display: block; }
.nav-wordmark {
  display: inline-flex;
  color: var(--sv-pitch);
  font-family: var(--sv-font-display);
  font-size: 22px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.04em;
}
.nav-wordmark-dot { color: var(--sv-volt); }
.nav-link, .nav-login {
  font-size: var(--sv-text-body);
  font-weight: 600;
  text-decoration: none;
}
.nav-link:hover, .nav-login:hover { text-decoration: underline; text-underline-offset: 4px; }
.nav-link[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: var(--sv-volt);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
}
.btn {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--sv-radius-sm);
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--sv-dur-tap) var(--sv-ease), background var(--sv-dur-tap) var(--sv-ease);
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--sv-volt); color: var(--sv-pitch); }
.btn-dark { background: var(--sv-pitch); color: var(--sv-paper); }
.btn-ghost { background: transparent; border-color: var(--sv-pitch); }
.nav-start { min-height: 44px; padding-inline: 18px; }

.breadcrumb {
  padding: 22px 0 0;
  color: var(--sv-stone);
  font-family: var(--sv-font-mono);
  font-size: var(--sv-text-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--sv-pitch); }

.hero {
  padding: 58px 0 88px;
  border-bottom: 1px solid var(--sv-paper-edge);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(390px, 0.75fr);
  gap: 72px;
  align-items: center;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  color: var(--sv-stone);
  font-family: var(--sv-font-mono);
  font-size: var(--sv-text-micro);
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.eyebrow::before {
  width: 28px;
  height: 3px;
  content: "";
  background: var(--sv-volt);
}
h1 {
  max-width: 770px;
  font-size: clamp(54px, 6.5vw, 80px);
  font-weight: 800;
  line-height: 0.92;
}
.hero-script {
  display: block;
  margin-top: 12px;
  color: var(--sv-volt);
  font-family: var(--sv-font-script);
  font-size: clamp(38px, 4.5vw, 58px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.02em;
}
.hero-lede {
  max-width: 720px;
  margin-top: 28px;
  color: var(--sv-stone);
  font-size: var(--sv-text-body-lg);
}
.freshness {
  margin-top: 18px;
  color: var(--sv-stone);
  font-family: var(--sv-font-mono);
  font-size: var(--sv-text-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.visual-card {
  position: relative;
  min-height: 390px;
  padding: 28px;
  background: var(--sv-pitch);
  color: var(--sv-paper);
  border: 1px solid var(--sv-pitch);
  box-shadow: 16px 16px 0 var(--sv-volt);
  overflow: hidden;
}
.visual-label {
  display: block;
  margin-bottom: 24px;
  color: var(--sv-paper-70);
  font-family: var(--sv-font-mono);
  font-size: var(--sv-text-micro);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.visual-card::after {
  position: absolute;
  right: -50px;
  bottom: -70px;
  width: 190px;
  height: 190px;
  content: "";
  border: 1px solid var(--sv-paper-40);
  border-radius: 50%;
}
.visual-stack { position: relative; z-index: 1; display: grid; gap: 12px; }
.visual-row {
  min-height: 66px;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  background: color-mix(in srgb, var(--sv-paper) 8%, transparent);
  border: 1px solid var(--sv-paper-10);
}
.visual-row strong { font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.visual-row small { display: block; color: var(--sv-paper-70); }
.visual-index { color: var(--sv-volt); font-family: var(--sv-font-mono); font-size: var(--sv-text-micro); }
.visual-arrow { font-family: var(--sv-font-display); font-size: var(--sv-text-h2); font-weight: 800; }
.formula-main {
  position: relative;
  z-index: 1;
  margin-top: 34px;
  padding: 26px 20px;
  background: var(--sv-paper);
  color: var(--sv-pitch);
  font-family: var(--sv-font-mono);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  text-align: center;
  transform: rotate(-1deg);
}
.formula-note { position: relative; z-index: 1; margin-top: 24px; color: var(--sv-paper-70); }
.story-note {
  position: relative;
  z-index: 1;
  padding: 20px;
  background: var(--sv-paper-card);
  color: var(--sv-pitch);
  border: 1px solid var(--sv-paper-edge);
  transform: rotate(-1deg);
}
.story-note + .story-note { margin-top: 14px; transform: rotate(1deg); }
.story-note strong { display: block; font-family: var(--sv-font-hand); font-size: var(--sv-text-h2); line-height: 1; }
.story-note span { display: block; margin-top: 10px; color: var(--sv-stone); }

.section { padding: 88px 0; }
.section--band {
  background: var(--sv-paper-band);
  border-block: 1px solid var(--sv-paper-edge);
}
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.55fr);
  gap: 60px;
  align-items: end;
  margin-bottom: 38px;
}
.section-kicker {
  margin-bottom: 12px;
  color: var(--sv-stone);
  font-family: var(--sv-font-mono);
  font-size: var(--sv-text-micro);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
h2 { font-size: clamp(40px, 5vw, 64px); font-weight: 800; line-height: 0.98; }
.section-intro { color: var(--sv-stone); font-size: var(--sv-text-body-lg); }
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.info-card {
  min-height: 280px;
  display: flex;
  flex-direction: column;
  padding: 26px;
  background: var(--sv-paper-card);
  border: 1px solid var(--sv-paper-edge);
}
.info-card--dark { background: var(--sv-pitch); color: var(--sv-paper); }
.card-index {
  margin-bottom: 38px;
  color: var(--sv-stone);
  font-family: var(--sv-font-mono);
  font-size: var(--sv-text-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.info-card--dark .card-index { color: var(--sv-paper-70); }
.info-card h3 { font-size: var(--sv-text-h2); font-weight: 800; line-height: 1.05; }
.info-card p { margin-top: 14px; color: var(--sv-stone); }
.info-card--dark p { color: var(--sv-paper-70); }
.card-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  margin-top: auto;
  padding-top: 24px;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--sv-volt);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}
.card-link:hover { color: var(--sv-volt); }
.boundary {
  margin-top: 24px;
  padding: 22px 24px;
  background: var(--sv-paper-card);
  border: 1px solid var(--sv-paper-edge);
  border-left: 6px solid var(--sv-volt);
}
.boundary strong { display: block; font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.boundary p { margin-top: 8px; color: var(--sv-stone); }

.link-panel {
  display: grid;
  grid-template-columns: minmax(280px, 0.7fr) minmax(0, 1.3fr);
  gap: 60px;
}
.link-copy p { max-width: 480px; margin-top: 18px; color: var(--sv-stone); }
.link-list { border-top: 1px solid var(--sv-pitch); }
.link-row {
  min-height: 92px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  text-decoration: none;
  border-bottom: 1px solid var(--sv-paper-edge);
}
.link-row:hover { padding-inline: 10px; background: var(--sv-paper-card); }
.link-row strong { display: block; font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.link-row small { display: block; margin-top: 4px; color: var(--sv-stone); font-size: var(--sv-text-link); }
.link-arrow { font-family: var(--sv-font-display); font-size: var(--sv-text-h2); font-weight: 800; }

.faq-list { max-width: 900px; margin-top: 32px; border-top: 1px solid var(--sv-pitch); }
.faq-list details { border-bottom: 1px solid var(--sv-paper-edge); }
.faq-list summary {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  cursor: pointer;
  font-family: var(--sv-font-display);
  font-size: var(--sv-text-body-lg);
  font-weight: 700;
}
.faq-list summary::after { content: "+"; color: var(--sv-volt); font-size: var(--sv-text-h2); }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { max-width: 760px; padding: 0 0 24px; color: var(--sv-stone); }

.related {
  padding: 76px 0;
  background: var(--sv-pitch);
  color: var(--sv-paper);
}
.related-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 30px; }
.related-head h2 { font-size: var(--sv-text-h1); }
.related-head p { max-width: 440px; color: var(--sv-paper-70); }
.related-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.related-link {
  min-height: 130px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px;
  color: var(--sv-paper);
  text-decoration: none;
  border: 1px solid var(--sv-paper-10);
}
.related-link:hover { border-color: var(--sv-volt); }
.related-link strong { font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.related-link span { color: var(--sv-paper-70); font-size: var(--sv-text-link); }

.close { padding: 76px 0; }
.close-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: center;
}
.close h2 { font-size: var(--sv-text-h1); }
.close p { max-width: 620px; margin-top: 16px; color: var(--sv-stone); font-size: var(--sv-text-body-lg); }
.close-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.footer { padding: 34px 0; border-top: 1px solid var(--sv-paper-edge); }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.footer-meta { color: var(--sv-stone); font-size: var(--sv-text-link); }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; }
.footer-links a { font-size: var(--sv-text-link); font-weight: 600; text-decoration: none; }
.footer-links a:hover { color: var(--sv-volt); }

@media (max-width: 720px) {
  .container { width: min(100% - 40px, 1180px); }
  .nav-row { min-height: 74px; padding: 0 20px; }
  .nav-brand { gap: 0; }
  .nav-links, .nav-login { display: none; }
  .nav-actions { gap: 10px; }
  .nav-start { min-height: 40px; padding-inline: 13px; font-size: 13px; }
  .breadcrumb { padding-top: 18px; }
  .hero { padding: 44px 0 68px; }
  .hero-grid, .section-head, .link-panel, .close-grid { grid-template-columns: 1fr; }
  .hero-grid { gap: 44px; }
  h1 { font-size: clamp(48px, 15vw, 64px); }
  .hero-script { font-size: clamp(36px, 11vw, 48px); }
  .hero-lede { font-size: 17px; }
  .hero-actions .btn { width: 100%; }
  .visual-card { min-height: 350px; padding: 22px; box-shadow: 8px 8px 0 var(--sv-volt); }
  .visual-row { grid-template-columns: 28px minmax(0, 1fr) auto; }
  .section { padding: 68px 0; }
  .section-head { gap: 20px; margin-bottom: 30px; }
  h2 { font-size: 42px; }
  .card-grid { grid-template-columns: 1fr; }
  .info-card { min-height: 0; }
  .link-panel { gap: 34px; }
  .link-row { min-height: 104px; }
  .related { padding: 64px 0; }
  .related-head { align-items: flex-start; flex-direction: column; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .related-link { min-height: 120px; }
  .close-grid { gap: 30px; }
  .close-actions .btn { width: 100%; }
  .footer-row { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
  .btn:hover { transform: none; }
}