:root {
  color-scheme: light dark;
  --yellow: #ffc72c;
  --ink: #121214;
  --muted: #66666d;
  --paper: #f7f5ef;
  --card: rgba(255, 255, 255, 0.78);
  --line: rgba(18, 18, 20, 0.1);
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 86% 4%, rgba(255, 199, 44, 0.2), transparent 24rem),
    var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC",
    "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.wrap { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 84%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(20px) saturate(1.25);
}
.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 760;
  letter-spacing: -0.02em;
}
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.nav-links { display: flex; gap: 24px; color: var(--muted); font-size: 14px; }
.nav-links a:hover { color: var(--ink); }

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: clamp(32px, 8vw, 100px);
  padding: 78px 0 86px;
}
.eyebrow {
  color: #8a6800;
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
h1 {
  margin: 18px 0 24px;
  max-width: 760px;
  font-size: clamp(52px, 7.4vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.065em;
}
.hero-copy {
  max-width: 620px;
  color: var(--muted);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.7;
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
}
.button.primary { color: #191400; background: var(--yellow); border-color: var(--yellow); }
.button.secondary { background: color-mix(in srgb, var(--card) 90%, transparent); }
.hero-art { position: relative; min-height: 500px; display: grid; place-items: center; }
.hero-art::before {
  content: "";
  position: absolute;
  width: min(360px, 84vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 0 30px 80px rgba(113, 83, 0, 0.16);
}
.hero-art img { position: relative; width: min(230px, 55vw); max-height: 470px; object-fit: contain; }

.section { padding: 104px 0; border-top: 1px solid var(--line); }
.section-head { max-width: 720px; margin-bottom: 48px; }
h2 { margin: 10px 0 16px; font-size: clamp(36px, 5vw, 58px); line-height: 1.08; letter-spacing: -0.05em; }
.lead { margin: 0; color: var(--muted); font-size: 18px; line-height: 1.7; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  min-height: 230px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--card);
}
.card .number { color: #9d7600; font-size: 13px; font-weight: 760; letter-spacing: 0.1em; }
.card h3 { margin: 34px 0 12px; font-size: 24px; letter-spacing: -0.025em; }
.card p { margin: 0; color: var(--muted); line-height: 1.7; }

.notice {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 40px;
  padding: 42px;
  border-radius: 30px;
  color: #fff;
  background: #171719;
}
.notice h2 { margin-top: 0; font-size: clamp(34px, 4vw, 52px); }
.notice p { color: #bebec4; line-height: 1.7; max-width: 700px; }
.notice .button { color: #191400; background: var(--yellow); border-color: var(--yellow); white-space: nowrap; }

.support-grid { display: grid; grid-template-columns: 1fr 280px; gap: 28px; align-items: stretch; }
.support-panel, .qr-panel {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--card);
}
.support-panel h3, .qr-panel h3 { margin: 0 0 12px; font-size: 25px; }
.support-panel p, .qr-panel p { color: var(--muted); line-height: 1.7; }
.contact-list { margin: 26px 0 0; display: grid; gap: 12px; }
.contact-item { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 17px 18px; border: 1px solid var(--line); border-radius: 18px; }
.contact-item span:first-child { color: var(--muted); }
.qr-panel img { display: block; width: 180px; height: 180px; margin: 24px auto 0; border-radius: 18px; }

.article { max-width: 780px; padding: 72px 0 110px; }
.article h1 { font-size: clamp(44px, 6vw, 72px); }
.article-meta { margin: -6px 0 44px; color: var(--muted); }
.article h2 { margin: 42px 0 12px; font-size: 26px; letter-spacing: -0.025em; }
.article p, .article li { color: #48484e; font-size: 17px; line-height: 1.82; }
.article ul { padding-left: 1.25em; }
.article-callout { margin: 34px 0; padding: 24px; border-left: 5px solid var(--yellow); border-radius: 0 20px 20px 0; background: var(--card); }

.other-product {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
  margin-top: 36px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--card);
}
.other-product img { width: 58px; height: 58px; border-radius: 15px; }
.other-product h3, .other-product p { margin: 0; }
.other-product p { margin-top: 5px; color: var(--muted); }
.other-product .arrow { font-size: 22px; color: var(--muted); }

.site-footer { padding: 34px 0; color: var(--muted); border-top: 1px solid var(--line); font-size: 13px; }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }

@media (max-width: 780px) {
  .nav-links a:first-child { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding: 60px 0 74px; }
  .hero-art { order: -1; min-height: 340px; }
  .hero-art::before { width: 280px; }
  .hero-art img { width: 160px; max-height: 310px; }
  h1 { font-size: clamp(48px, 15vw, 68px); }
  .grid { grid-template-columns: 1fr; }
  .card { min-height: auto; }
  .notice { grid-template-columns: 1fr; padding: 30px; }
  .support-grid { grid-template-columns: 1fr; }
  .other-product { grid-template-columns: auto 1fr; }
  .other-product .arrow { display: none; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f6f4ee;
    --muted: #a6a5aa;
    --paper: #09090a;
    --card: rgba(31, 31, 34, 0.86);
    --line: rgba(255, 255, 255, 0.11);
  }
  body { background: radial-gradient(circle at 86% 4%, rgba(255, 199, 44, 0.13), transparent 24rem), var(--paper); }
  .eyebrow, .card .number { color: #ffd766; }
  .article p, .article li { color: #c4c3c8; }
}

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