:root {
  --ink: #172018;
  --muted: #5f695f;
  --paper: #f3f0e7;
  --white: #ffffff;
  --green: #183427;
  --green-2: #244c39;
  --accent: #cf7a34;
  --line: rgba(23, 32, 24, .16);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.8;
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.section { padding: 110px 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 240, 231, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px; height: 42px; display: grid; place-items: center;
  color: var(--paper); background: var(--green); font-weight: 900; font-size: 20px;
}
.brand-text { display: grid; line-height: 1.25; }
.brand-text strong { font-size: 15px; letter-spacing: .04em; }
.brand-text small { margin-top: 3px; color: var(--muted); font-size: 10px; letter-spacing: .18em; }
.global-nav { display: flex; align-items: center; gap: 30px; font-weight: 700; font-size: 13px; }
.global-nav a { padding: 8px 0; border-bottom: 2px solid transparent; }
.global-nav a:hover { border-color: var(--accent); }
.nav-toggle { display: none; border: 0; background: none; font: inherit; font-weight: 800; color: var(--green); }

.hero { position: relative; overflow: hidden; background: var(--paper); border-bottom: 1px solid var(--line); }
.hero-pattern {
  position: absolute; inset: 0 0 0 55%; opacity: .22;
  background:
    linear-gradient(135deg, transparent 48%, var(--green) 49%, transparent 50%) 0 0/38px 38px,
    linear-gradient(45deg, transparent 48%, var(--green) 49%, transparent 50%) 0 0/38px 38px;
  mask-image: linear-gradient(90deg, transparent, #000 28%);
}
.hero-grid { position: relative; min-height: 690px; display: grid; grid-template-columns: 1.18fr .82fr; gap: 70px; align-items: center; }
.hero-copy { padding: 70px 0 80px; }
.hero-lead { margin: 0 0 26px; color: var(--green-2); font-weight: 700; font-size: 18px; letter-spacing: .04em; }
.hero h1 { margin: 0; font-size: clamp(54px, 6.5vw, 92px); line-height: 1.06; letter-spacing: -.055em; font-weight: 900; }
.hero h1 span { color: var(--green); }
.hero-body { margin: 32px 0 0; max-width: 720px; color: var(--muted); font-size: 16px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 38px; }
.button {
  min-height: 54px; padding: 0 24px; display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--green); font-weight: 800; font-size: 14px; transition: .2s ease;
}
.button-primary { color: var(--paper); background: var(--green); }
.button-primary:hover { background: var(--green-2); transform: translateY(-2px); }
.button-secondary { background: transparent; }
.button-secondary:hover { background: rgba(24,52,39,.06); }

.hero-panel { align-self: center; padding: 32px; color: var(--paper); background: var(--green); box-shadow: 18px 18px 0 rgba(207,122,52,.28); }
.hero-panel h2 { margin: 0 0 20px; font-size: 14px; letter-spacing: .08em; }
.hero-panel ol { list-style: none; padding: 0; margin: 0; }
.hero-panel li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; align-items: start; padding: 17px 0; border-top: 1px solid rgba(255,255,255,.18); }
.hero-panel li > span { color: #e4a16b; font-weight: 900; font-size: 13px; }
.hero-panel li div { display: grid; }
.hero-panel li strong { font-size: 16px; }
.hero-panel li small { margin-top: 5px; color: rgba(255,255,255,.68); font-size: 12px; }

.section-number { margin: 0 0 16px; color: var(--accent); font-size: 13px; font-weight: 900; letter-spacing: .14em; }
.intro-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 110px; }
.intro h2 { margin: 0; font-size: clamp(32px, 4vw, 54px); line-height: 1.35; letter-spacing: -.03em; }
.intro-text { padding-top: 27px; font-size: 17px; }
.intro-text p { margin: 0 0 22px; }

.section-dark { color: var(--paper); background: var(--green); }
.section-heading { display: grid; grid-template-columns: 100px 1fr; align-items: start; margin-bottom: 48px; }
.section-heading.light p:not(.section-number) { color: rgba(255,255,255,.7); }
.section-heading h2 { margin: 0; font-size: clamp(34px, 4vw, 56px); line-height: 1.2; letter-spacing: -.035em; }
.section-heading > div > p { margin: 14px 0 0; color: var(--muted); }
.roadmap-list { border-top: 1px solid rgba(255,255,255,.25); }
.roadmap-item { display: grid; grid-template-columns: 90px 1fr auto; gap: 26px; align-items: center; padding: 30px 0; border-bottom: 1px solid rgba(255,255,255,.22); }
.roadmap-no { color: #e4a16b; font-size: 15px; font-weight: 900; }
.roadmap-item h3 { margin: 0 0 5px; font-size: 24px; }
.roadmap-item p { margin: 0; color: rgba(255,255,255,.68); font-size: 14px; }
.roadmap-item a { padding: 8px 0 8px 18px; color: #f0b88d; font-weight: 800; font-size: 13px; }

.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.topic-card { min-height: 270px; padding: 30px; display: flex; flex-direction: column; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: .2s ease; }
.topic-card:hover { background: var(--white); transform: translateY(-3px); box-shadow: 0 16px 34px rgba(24,52,39,.07); }
.topic-card > span { color: var(--accent); font-size: 11px; font-weight: 900; letter-spacing: .14em; }
.topic-card h3 { margin: 20px 0 10px; font-size: 23px; }
.topic-card p { margin: 0; color: var(--muted); font-size: 14px; }
.topic-card b { margin-top: auto; padding-top: 24px; color: var(--green); font-size: 13px; }

.podcast { background: #e5dfd0; }
.podcast-inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 90px; align-items: center; }
.podcast h2 { margin: 0 0 24px; font-size: clamp(36px, 4.5vw, 62px); line-height: 1.2; letter-spacing: -.04em; }
.podcast p { max-width: 700px; }
.podcast-tagline { margin-top: 32px !important; color: var(--green); font-weight: 900; font-size: 23px; }
.podcast-box { min-height: 310px; padding: 38px; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; color: var(--paper); background: var(--ink); }
.podcast-box > span { margin-bottom: 42px; color: #e4a16b; font-size: 11px; font-weight: 900; letter-spacing: .18em; }
.podcast-box strong { font-size: 27px; }
.podcast-box small { margin: 4px 0 30px; color: rgba(255,255,255,.66); }

.notice { padding: 30px 0; background: #d8cfbc; border-top: 1px solid rgba(23,32,24,.1); }
.notice-inner { display: grid; grid-template-columns: 80px 1fr; gap: 20px; align-items: start; }
.notice strong { color: var(--accent); font-size: 13px; letter-spacing: .08em; }
.notice p { margin: 0; color: #4b504a; font-size: 13px; line-height: 1.75; }

.site-footer { padding: 54px 0; color: rgba(255,255,255,.72); background: #111a13; }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: end; }
.footer-inner strong { color: #fff; font-size: 16px; }
.footer-inner p { margin: 7px 0 0; font-size: 12px; }
.footer-inner nav { display: flex; gap: 22px; font-size: 12px; }
.footer-inner small { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.12); padding-top: 22px; font-size: 11px; }

@media (max-width: 900px) {
  .section { padding: 80px 0; }
  .nav-toggle { display: block; }
  .global-nav { position: absolute; left: 0; right: 0; top: 78px; display: none; padding: 22px; flex-direction: column; align-items: stretch; gap: 0; background: var(--paper); border-bottom: 1px solid var(--line); }
  .global-nav.is-open { display: flex; }
  .global-nav a { padding: 13px 0; }
  .hero-pattern { inset: 0; opacity: .1; mask-image: linear-gradient(180deg, transparent, #000 40%); }
  .hero-grid { min-height: auto; grid-template-columns: 1fr; gap: 10px; padding-top: 30px; padding-bottom: 70px; }
  .hero-copy { padding: 50px 0 30px; }
  .hero h1 { font-size: clamp(48px, 13vw, 76px); }
  .hero-panel { margin: 0 0 16px; box-shadow: 10px 10px 0 rgba(207,122,52,.25); }
  .intro-grid, .podcast-inner { grid-template-columns: 1fr; gap: 40px; }
  .section-heading { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .header-inner { min-height: 70px; }
  .global-nav { top: 70px; }
  .brand-mark { width: 38px; height: 38px; }
  .brand-text strong { font-size: 13px; }
  .hero-grid { padding-top: 10px; }
  .hero-copy { padding-top: 40px; }
  .hero-lead { font-size: 15px; }
  .hero-body { font-size: 14px; }
  .pc-only { display: none; }
  .hero-actions { display: grid; }
  .button { width: 100%; }
  .hero-panel { padding: 24px; }
  .intro-text { padding-top: 0; font-size: 15px; }
  .roadmap-item { grid-template-columns: 46px 1fr; gap: 12px; align-items: start; }
  .roadmap-item a { grid-column: 2; padding-left: 0; }
  .roadmap-item h3 { font-size: 20px; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-card { min-height: 230px; }
  .podcast-box { padding: 28px; }
  .notice-inner { grid-template-columns: 1fr; gap: 6px; }
  .footer-inner { grid-template-columns: 1fr; align-items: start; }
  .footer-inner nav { flex-wrap: wrap; }
}