:root {
  color-scheme: light;
  --ink: #121923;
  --muted: #5e6773;
  --paper: #f6f5f0;
  --white: #ffffff;
  --dark: #06111f;
  --cyan: #53dff2;
  --line: #d6d9dc;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.7;
}
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
h1, h2, p { margin-top: 0; }

.site-header {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid rgba(255, 255, 255, .18);
  color: #fff;
  font-size: 14px;
}
.brand { font-weight: 700; text-decoration: none; }
.site-header nav { display: flex; gap: 28px; }
.site-header nav a { color: #d8e1eb; text-decoration: none; }

.hero {
  position: relative;
  min-height: min(760px, 100svh);
  display: flex;
  align-items: center;
  isolation: isolate;
  overflow: hidden;
  background: var(--dark);
  color: #fff;
}
.hero canvas { z-index: 0; }
.hero-content {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
  padding: 120px 0 74px;
  pointer-events: none;
}
.hero-content a { pointer-events: auto; }
.product-name,
.section-label {
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}
.hero .product-name { color: var(--cyan); }
h1 {
  max-width: 860px;
  margin-bottom: 24px;
  font-size: clamp(44px, 6.2vw, 78px);
  line-height: 1.08;
  letter-spacing: -.055em;
  text-wrap: balance;
}
.lead {
  max-width: 640px;
  margin-bottom: 24px;
  color: #d6dde5;
  font-size: clamp(16px, 1.6vw, 19px);
}
.hero-price {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 30px;
}
.hero-price strong { font-size: clamp(28px, 4vw, 42px); letter-spacing: -.035em; }
.hero-price span { color: #c2ccd6; font-size: 14px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 1px solid currentColor;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.button-primary { border-color: #fff; background: #fff; color: var(--dark); }
.button-secondary { border-color: rgba(255, 255, 255, .48); color: #fff; }
.button-disabled { border-color: #c7cbd0; background: #e5e7e8; color: #858b92; cursor: not-allowed; }
.purchase .button-primary { border-color: var(--ink); background: var(--ink); color: #fff; }

.section {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
  padding: clamp(72px, 9vw, 112px) 0;
}
h2 {
  margin-bottom: 18px;
  font-size: clamp(32px, 4.2vw, 50px);
  line-height: 1.16;
  letter-spacing: -.045em;
  text-wrap: balance;
}
.demo-heading > p:last-child,
.package-copy > p:last-child { max-width: 620px; margin-bottom: 0; color: var(--muted); }

.demo { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(44px, 8vw, 96px); }
.engine-switcher { border-top: 1px solid var(--line); }
.preset {
  width: 100%;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 22px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}
.preset span { color: #818891; font-size: 13px; }
.preset b { font-size: 19px; }
.preset small { color: var(--muted); font-size: 13px; }
.preset.is-active b { color: #087f91; }
.preset.is-active { border-bottom-color: #087f91; }

.package {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: clamp(44px, 8vw, 96px);
  border-top: 1px solid var(--line);
}
.package-specs { margin: 0; border-top: 1px solid var(--line); }
.package-specs div {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.package-specs dt { color: var(--muted); font-size: 14px; }
.package-specs dd { margin: 0; font-weight: 700; }

.purchase {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
  text-align: left;
}
.purchase-main { max-width: 650px; }
.purchase h2 { margin-bottom: 8px; }
.purchase h2 { font-size: clamp(28px, 7.4vw, 42px); }
.buyout { margin-bottom: 26px; color: var(--muted); font-size: 17px; }
.purchase-list { margin: 0 0 28px; padding-left: 1.25em; }
.purchase-list li + li { margin-top: 6px; }
.purchase-note { margin: 18px 0 0; color: var(--muted); font-size: 13px; }
footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px max(24px, calc((100vw - var(--max)) / 2));
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}
footer nav { display: flex; flex-wrap: wrap; gap: 16px; }
footer a { color: inherit; text-underline-offset: 3px; }

@media (max-width: 760px) {
  .site-header { padding: 20px 18px; }
  .site-header nav { gap: 16px; }
  .site-header nav a:nth-child(2) { display: none; }
  .hero { min-height: 680px; }
  .hero-content { width: calc(100% - 28px); padding-top: 112px; }
  h1 { font-size: clamp(32px, 9vw, 42px); line-height: 1.15; word-break: keep-all; }
  .hero-price { align-items: flex-start; flex-direction: column; gap: 2px; }
  .section { width: calc(100% - 36px); padding: 68px 0; }
  .demo, .package { grid-template-columns: 1fr; gap: 42px; }
  .preset { grid-template-columns: 34px minmax(0, 1fr); }
  .preset small { grid-column: 2; }
  .package-specs div { grid-template-columns: 1fr; gap: 4px; }
  footer { align-items: flex-start; flex-direction: column; padding: 24px 18px; }
}

@media (max-width: 380px) {
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}