:root {
  color-scheme: light;
  --ink: #121212;
  --muted: #686866;
  --line: #deded9;
  --paper: #f7f7f3;
  --surface: #ffffff;
  --accent: #245fda;
  --accent-soft: #eaf0ff;
  --positive: #246b45;
  --positive-soft: #eaf6ef;
  --shell: min(1120px, calc(100% - 40px));
  font-family:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue",
    "Noto Sans JP", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: white;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.site-header {
  width: var(--shell);
  min-height: 76px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 20px;
  font-weight: 750;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.site-header nav,
.site-footer nav {
  display: flex;
  gap: 26px;
  align-items: center;
}

.site-header nav a,
.site-footer nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 570;
  text-decoration: none;
}

.site-header nav a:hover,
.site-header nav a:focus-visible,
.site-footer nav a:hover,
.site-footer nav a:focus-visible {
  color: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: clamp(48px, 9vw, 124px);
  align-items: end;
  min-height: 680px;
  padding-block: 96px 112px;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.14em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 720px;
  margin-bottom: 20px;
  font-size: clamp(56px, 8.5vw, 110px);
  font-weight: 690;
  letter-spacing: -0.075em;
  line-height: 0.92;
}

.hero-ja {
  margin-bottom: 22px;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.35;
}

.hero-lede {
  max-width: 620px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.65;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.58);
  color: var(--muted);
  font-size: 13px;
  font-weight: 620;
}

.status-pill span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.promise-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--surface);
  box-shadow: 0 24px 80px rgba(30, 30, 25, 0.06);
}

.promise-label,
.promise-note {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.promise-main {
  max-width: 280px;
  margin: 58px 0;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 660;
  letter-spacing: -0.045em;
  line-height: 1.12;
}

.promise-rule {
  width: 100%;
  height: 2px;
  margin-bottom: 18px;
  background: linear-gradient(90deg, var(--accent) 0 58%, var(--line) 58% 100%);
}

.example-section {
  padding-block: 120px;
  background: var(--ink);
  color: white;
}

.example-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(420px, 1.2fr);
  gap: clamp(56px, 10vw, 132px);
  align-items: center;
}

.section-intro h2,
.status-grid h2 {
  margin-bottom: 26px;
  font-size: clamp(38px, 5vw, 64px);
  font-weight: 640;
  letter-spacing: -0.055em;
  line-height: 1.02;
}

.section-intro > p:last-child {
  max-width: 520px;
  margin-bottom: 0;
  color: #b9b9b5;
  font-size: 18px;
}

.comparison-card {
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid #393936;
  border-radius: 28px;
  background: #1a1a19;
}

.demo-label {
  margin-bottom: 30px;
  color: #969690;
  font-size: 12px;
  font-weight: 620;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.product-row {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  border-radius: 18px;
}

.product-row-highlight {
  background: #262d3d;
  outline: 1px solid #3c4e76;
}

.product-name,
.price {
  margin-bottom: 2px;
  font-size: 20px;
  font-weight: 670;
}

.price {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.product-detail {
  margin-bottom: 0;
  color: #aaa;
  font-size: 14px;
}

.versus {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-block: 12px;
  color: #777;
  font-size: 12px;
  text-transform: uppercase;
}

.versus::before,
.versus::after {
  content: "";
  flex: 1;
  height: 1px;
  background: #343432;
}

.delta {
  margin-block: 28px 20px;
  padding: 18px 20px;
  border-radius: 16px;
  background: #222221;
}

.delta p {
  margin: 0;
}

.fit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.fit-grid > div {
  padding: 18px 20px;
  border: 1px solid #383836;
  border-radius: 16px;
}

.fit-grid p {
  margin: 0;
}

.fit-grid .fit-label {
  margin-bottom: 5px;
  color: #aaa;
  font-size: 12px;
  font-weight: 650;
  text-transform: uppercase;
}

.fit-grid .fit-positive {
  border-color: #315f47;
  background: #17251e;
}

.principles {
  padding-block: 128px;
}

.section-intro.compact {
  max-width: 720px;
  margin-bottom: 72px;
}

.section-intro.compact h2 {
  color: var(--ink);
}

.principle-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.principle-list li {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  padding-block: 32px;
  border-top: 1px solid var(--line);
}

.principle-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.principle-number {
  color: var(--accent);
  font-size: 13px;
  font-weight: 720;
}

.principle-list h3 {
  margin-bottom: 6px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 630;
  letter-spacing: -0.035em;
}

.principle-list p {
  max-width: 620px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 17px;
}

.buyer-side {
  padding-block: 86px;
  background: var(--accent-soft);
}

.buyer-grid {
  display: grid;
  grid-template-columns: 1fr 0.75fr;
  gap: clamp(48px, 10vw, 140px);
  align-items: end;
}

.buyer-statement {
  margin-bottom: 0;
  font-size: clamp(30px, 4.2vw, 54px);
  font-weight: 650;
  letter-spacing: -0.05em;
  line-height: 1.28;
}

.buyer-support {
  margin-bottom: 0;
  color: #44506a;
  font-size: 17px;
}

.status-section {
  padding-block: 128px;
}

.status-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(48px, 9vw, 120px);
}

.status-grid h2 {
  margin-bottom: 0;
}

.status-grid > div > p:first-child {
  color: var(--muted);
  font-size: 18px;
}

.status-detail {
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-row {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-row p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.legal-page {
  min-height: calc(100vh - 176px);
  padding-block: 86px 120px;
}

.legal-page h1 {
  margin-bottom: 20px;
  font-size: clamp(48px, 7vw, 82px);
}

.legal-updated {
  margin-bottom: 52px;
  color: var(--muted);
  font-size: 14px;
}

.legal-content {
  max-width: 720px;
}

.legal-content section {
  padding-block: 24px;
  border-top: 1px solid var(--line);
}

.legal-content h2 {
  margin-bottom: 8px;
  font-size: 19px;
  font-weight: 650;
}

.legal-content p {
  margin-bottom: 0;
  color: var(--muted);
}

.not-found {
  min-height: calc(100vh - 176px);
  display: grid;
  place-items: center;
  text-align: center;
}

.not-found h1 {
  font-size: clamp(56px, 10vw, 108px);
}

@media (max-width: 760px) {
  :root {
    --shell: min(100% - 32px, 680px);
  }

  .site-header {
    min-height: 66px;
  }

  .site-header nav {
    gap: 16px;
  }

  .site-header nav a {
    font-size: 12px;
  }

  .site-header nav a:nth-child(2) {
    display: none;
  }

  .hero,
  .example-grid,
  .buyer-grid,
  .status-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    gap: 48px;
    padding-block: 74px 82px;
  }

  h1 {
    font-size: clamp(52px, 17vw, 72px);
  }

  .hero-ja {
    font-size: 23px;
  }

  .promise-main {
    margin-block: 44px;
  }

  .example-section,
  .principles,
  .status-section {
    padding-block: 84px;
  }

  .example-grid {
    gap: 48px;
  }

  .comparison-card {
    padding: 18px;
    border-radius: 22px;
  }

  .product-row {
    padding-inline: 12px;
  }

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

  .section-intro.compact {
    margin-bottom: 44px;
  }

  .principle-list li {
    grid-template-columns: 52px 1fr;
    gap: 12px;
  }

  .buyer-side {
    padding-block: 64px;
  }

  .buyer-grid,
  .status-grid {
    gap: 36px;
  }

  .footer-row {
    min-height: 92px;
  }

  .site-footer nav {
    gap: 18px;
  }
}

@media (max-width: 390px) {
  .site-header nav a:first-child {
    display: none;
  }

  .product-row {
    align-items: flex-start;
  }

  .product-name,
  .price {
    font-size: 18px;
  }
}

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