:root {
  --navy: #0c1e3d;
  --navy-2: #17305a;
  --ink: #1a2438;
  --muted: #6a7689;
  --line: #e3e6ec;
  --paper: #ffffff;
  --cream: #f7f4ec;
  --card: #ffffff;
  --gold: #b8935a;
  --gold-2: #d4b079;
  --gold-soft: #f3ead9;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.hero,
.section,
.footer {
  padding: 56px clamp(20px, 6vw, 72px);
}

.hero {
  position: relative;
  min-height: 78vh;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 84% 12%, var(--gold-soft) 0%, transparent 44%),
    var(--paper);
}

.decorated::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background:
    linear-gradient(135deg, transparent 48%, var(--gold-soft) 48%, var(--gold-soft) 49%, transparent 49%),
    linear-gradient(115deg, transparent 62%, var(--gold-soft) 62%, var(--gold-soft) 63%, transparent 63%),
    linear-gradient(150deg, transparent 72%, var(--gold-soft) 72%, var(--gold-soft) 73%, transparent 73%);
  opacity: 0.9;
  pointer-events: none;
}

.nav {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 88px;
}

.brand {
  display: inline-block;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--gold);
  color: var(--navy);
  font-family: "Noto Serif JP", serif;
  font-size: 24px;
  font-weight: 700;
}

.nav-link {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.kicker {
  position: relative;
  z-index: 1;
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .22em;
  text-transform: uppercase;
}

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

h1,
h2,
h3 {
  font-family: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  color: var(--navy);
}

h1 {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin-bottom: 24px;
  font-size: 64px;
  line-height: 1.18;
}

h2 {
  margin-bottom: 28px;
  font-size: 40px;
  line-height: 1.25;
}

h3 {
  margin: 18px 0 10px;
  font-size: 22px;
  line-height: 1.35;
}

.lead {
  position: relative;
  z-index: 1;
  max-width: 820px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.9;
}

code {
  padding: 2px 6px;
  background: var(--cream);
  color: var(--navy);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}

.hero-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
}

.btn-primary {
  padding: 16px 32px;
  background: var(--navy);
  color: #fff;
  font-family: "Noto Serif JP", serif;
  font-size: 18px;
  font-weight: 700;
  border: none;
  cursor: pointer;
}

.btn-primary::before {
  content: "▣ ";
  color: var(--gold);
  margin-right: 8px;
}

.btn-secondary {
  padding: 14px 28px;
  background: transparent;
  color: var(--gold);
  border: 2px solid var(--gold);
  font-family: "Noto Serif JP", serif;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.section.light {
  background: var(--paper);
}

.section.dark {
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-2) 100%);
  color: #fff;
}

.section.dark h2 {
  color: #fff;
}

.card-grid,
.impact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  padding: 24px 28px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
}

.card p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.numbered {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  color: var(--gold);
  font-family: "Noto Serif JP", serif;
  font-size: 22px;
  font-weight: 700;
}

.impact-number {
  text-align: center;
}

.impact-number .value {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 6px;
  margin-bottom: 12px;
  color: var(--gold-2);
  font-family: "Noto Serif JP", serif;
  font-weight: 900;
}

.impact-number .value .num {
  font-size: 72px;
  line-height: 1;
}

.impact-number .value .unit {
  font-size: 28px;
}

.impact-number .label {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .08em;
}

.impact-number .desc {
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  margin-top: 8px;
}

.statement {
  max-width: 900px;
  padding-left: 24px;
  border-left: 4px solid var(--gold);
  color: var(--navy);
  font-family: "Noto Serif JP", serif;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.6;
}

.check-list {
  display: grid;
  gap: 8px;
  max-width: 860px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-item {
  padding: 8px 0 8px 28px;
  position: relative;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
}

.check-item::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--gold);
  font-weight: 900;
  font-size: 16px;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--navy);
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
}

.to-top {
  padding: 10px 18px;
  color: #fff;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.28);
  font: inherit;
  cursor: pointer;
}

@media (max-width: 820px) {
  .hero,
  .section,
  .footer {
    padding: 40px 20px;
  }

  .nav {
    margin-bottom: 60px;
  }

  h1 {
    font-size: 44px;
  }

  h2 {
    font-size: 34px;
  }

  .card-grid,
  .impact-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }
}