:root {
  --ink: #17233f;
  --muted: #65708a;
  --night: #08172f;
  --night-soft: #10264a;
  --gold: #e1b75b;
  --gold-soft: #fff4d7;
  --lavender: #d9d2ff;
  --sky: #dcecff;
  --paper: #fffdf8;
  --surface: #ffffff;
  --line: #e8e3d9;
  --shadow: 0 18px 50px rgba(8, 23, 47, 0.1);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% -5%, rgba(217, 210, 255, .62), transparent 30%),
    radial-gradient(circle at 95% 4%, rgba(220, 236, 255, .72), transparent 28%),
    var(--paper);
  font-family: "Noto Sans JP", "Noto Sans", sans-serif;
  line-height: 1.75;
}

a { color: inherit; }
button { font: inherit; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  color: #fff;
  background: var(--night);
  border-radius: 8px;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px clamp(18px, 4vw, 54px);
  color: #fff;
  background: rgba(8, 23, 47, .94);
  border-bottom: 1px solid rgba(255,255,255,.12);
  backdrop-filter: blur(14px);
}

.brand {
  text-decoration: none;
  font-family: "Cormorant Garamond", serif;
  font-size: 22px;
  letter-spacing: .08em;
}

.nav-actions { display: flex; align-items: center; gap: 8px; }
.lang-btn {
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 999px;
  padding: 6px 12px;
  color: rgba(255,255,255,.72);
  background: transparent;
  cursor: pointer;
}
.lang-btn.active { color: var(--night); background: var(--gold); border-color: var(--gold); }

.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 77% 23%, rgba(225, 183, 91, .26), transparent 22%),
    radial-gradient(circle at 18% 92%, rgba(166, 148, 255, .24), transparent 32%),
    linear-gradient(135deg, var(--night), #132b54 64%, #0a1c39);
}
.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 50%;
}
.hero::before { width: 520px; height: 520px; right: -170px; top: -220px; }
.hero::after { width: 310px; height: 310px; right: -45px; top: -112px; }
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1120px;
  margin: 0 auto;
  padding: clamp(72px, 10vw, 124px) 22px clamp(64px, 9vw, 104px);
}
.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
}
.hero h1 {
  max-width: 720px;
  margin: 0;
  font-family: "Cormorant Garamond", "Noto Serif JP", serif;
  font-size: clamp(38px, 6vw, 66px);
  font-weight: 600;
  line-height: 1.03;
  letter-spacing: -.02em;
}
.hero-copy {
  max-width: 720px;
  margin: 24px 0 0;
  color: rgba(255,255,255,.78);
  font-size: clamp(15px, 2vw, 18px);
}
.hero-note {
  display: inline-flex;
  margin-top: 30px;
  padding: 10px 16px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  color: rgba(255,255,255,.82);
  background: rgba(255,255,255,.07);
  font-size: 13px;
}

.page { max-width: 1120px; margin: 0 auto; padding: 72px 22px 96px; }
.section { margin-top: 76px; }
.section:first-child { margin-top: 0; }
.section-kicker { margin: 0 0 8px; color: #765716; font-size: 12px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.section h2 { margin: 0; font-size: clamp(28px, 4vw, 44px); line-height: 1.2; letter-spacing: -.025em; }
.section-lead { max-width: 720px; margin: 14px 0 0; color: var(--muted); }

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
}
.product-card {
  position: relative;
  min-height: 258px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 28px;
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 28px rgba(8, 23, 47, .06);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.product-card::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  right: -70px;
  bottom: -86px;
  border-radius: 50%;
  background: var(--card-glow, var(--gold-soft));
}
.product-card:hover { transform: translateY(-4px); border-color: #d7b769; box-shadow: var(--shadow); }
.card-top { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.product-code { display: inline-flex; padding: 5px 10px; border-radius: 999px; color: #72551c; background: var(--gold-soft); font-size: 11px; font-weight: 700; letter-spacing: .08em; }
.product-icon { font-size: 34px; }
.product-card h3 { position: relative; z-index: 1; margin: 24px 0 8px; font-size: 22px; line-height: 1.3; }
.product-card p { position: relative; z-index: 1; margin: 0; color: var(--muted); font-size: 14px; }
.card-link { position: relative; z-index: 1; margin-top: auto; padding-top: 22px; color: #654a12; font-size: 13px; font-weight: 700; }

.check-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 28px; }
.check-card { padding: 22px; background: rgba(255,255,255,.72); border: 1px solid var(--line); border-radius: 18px; }
.check-card strong { display: block; margin-bottom: 8px; font-size: 15px; }
.check-card p { margin: 0; color: var(--muted); font-size: 13px; }

.guide-shell { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 32px; align-items: start; }
.guide-main { min-width: 0; }
.side-card { position: sticky; top: 86px; padding: 22px; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 8px 28px rgba(8,23,47,.06); }
.side-card h3 { margin: 0 0 12px; font-size: 16px; }
.side-card a { display: block; padding: 8px 0; color: var(--muted); text-decoration: none; font-size: 13px; border-bottom: 1px solid var(--line); }
.side-card a:last-child { border-bottom: 0; }
.side-card a:hover { color: #8a681f; }

.steps { display: grid; gap: 14px; margin-top: 26px; }
.step { display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 16px; padding: 22px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; }
.step-num { width: 44px; height: 44px; display: grid; place-items: center; color: var(--night); background: var(--gold); border-radius: 50%; font-weight: 800; }
.step h3 { margin: 0 0 6px; font-size: 17px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

.callout { margin-top: 24px; padding: 22px 24px; border-left: 4px solid var(--gold); border-radius: 0 18px 18px 0; background: var(--gold-soft); }
.callout strong { display: block; margin-bottom: 6px; }
.callout p { margin: 0; color: #66583c; font-size: 14px; }
.callout.cool { border-color: #9286dc; background: #f0edff; }
.callout.cool p { color: #57506f; }

.feature-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 24px; }
.feature { padding: 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; }
.feature strong { display: block; margin-bottom: 4px; font-size: 14px; }
.feature span { color: var(--muted); font-size: 13px; }

.back-link { display: inline-flex; margin-bottom: 28px; color: #8a681f; font-size: 13px; font-weight: 700; text-decoration: none; }
.page-title { max-width: 680px; margin: 0; font-size: clamp(32px, 5vw, 50px); line-height: 1.12; letter-spacing: -.025em; }
.page-intro { max-width: 720px; margin: 18px 0 0; color: var(--muted); font-size: 16px; }
.usage-note { margin: 48px 0 0; padding-top: 18px; color: var(--muted); border-top: 1px solid var(--line); font-size: 12px; }
.support-link { color: #654a12; font-weight: 700; }

a:focus-visible, button:focus-visible { outline: 3px solid #8b71d8; outline-offset: 3px; }

footer { padding: 34px 22px; color: rgba(255,255,255,.68); text-align: center; background: var(--night); font-size: 12px; }

@media (max-width: 820px) {
  .product-grid, .feature-list { grid-template-columns: 1fr; }
  .check-grid { grid-template-columns: 1fr; }
  .guide-shell { grid-template-columns: 1fr; }
  .side-card { position: static; order: -1; }
}

@media (max-width: 560px) {
  .site-nav { padding: 12px 16px; }
  .brand { font-size: 19px; }
  .hero-inner { padding-left: 18px; padding-right: 18px; }
  .page { padding: 54px 16px 78px; }
  .product-card { min-height: 235px; padding: 22px; }
  .step { grid-template-columns: 36px minmax(0,1fr); padding: 18px; }
  .step-num { width: 36px; height: 36px; }
}