:root {
  --ink: #1f2623;
  --muted: #65706b;
  --paper: #fffefb;
  --soft: #eef6f2;
  --mint: #d9f0e5;
  --green: #1e7558;
  --green-dark: #11513d;
  --orange: #f59a23;
  --line: #dce5e0;
  --shadow: 0 22px 60px rgba(31, 66, 52, 0.12);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
.container { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; background: #fff; padding: 10px 16px; border-radius: 8px; }
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 254, 251, 0.92);
  border-bottom: 1px solid rgba(220, 229, 224, 0.8);
  backdrop-filter: blur(14px);
}
.header-inner { height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; text-decoration: none; letter-spacing: .01em; }
.brand-mark { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50% 50% 44% 44%; color: white; background: var(--green); box-shadow: inset 0 -5px rgba(0,0,0,.08); }
.desktop-nav { display: flex; align-items: center; gap: 28px; }
.desktop-nav a { font-size: 14px; font-weight: 700; text-decoration: none; }
.desktop-nav a:not(.nav-cta):hover { color: var(--green); }
.nav-cta { padding: 10px 18px; border-radius: 999px; color: white; background: var(--green); }

.hero { position: relative; overflow: hidden; padding: 88px 0 80px; background: linear-gradient(135deg, #f8fcfa 0%, #eef8f3 60%, #fff7e7 100%); }
.hero::before { content: ""; position: absolute; width: 520px; height: 520px; border-radius: 50%; right: -180px; top: -240px; background: rgba(255,255,255,.72); }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 76px; }
.eyebrow { margin: 0 0 14px; color: var(--green); font-size: 13px; font-weight: 900; letter-spacing: .16em; text-transform: uppercase; }
.hero h1, .section h2, .cta-section h2 { margin: 0; line-height: 1.22; letter-spacing: -.035em; }
.hero h1 { font-size: clamp(42px, 5.4vw, 74px); }
.hero h1 span { color: var(--green); }
.hero-lead { max-width: 650px; margin: 26px 0 0; color: #505c56; font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { min-height: 54px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 13px 24px; border: 1px solid transparent; border-radius: 999px; font-weight: 800; text-decoration: none; transition: transform .2s, box-shadow .2s, background .2s; }
.button:hover { transform: translateY(-2px); }
.button:focus-visible, a:focus-visible { outline: 3px solid rgba(30,117,88,.35); outline-offset: 3px; }
.button-primary { color: #fff; background: var(--green); box-shadow: 0 12px 30px rgba(30,117,88,.24); }
.button-primary:hover { background: var(--green-dark); }
.button-secondary { color: var(--green-dark); border-color: var(--green); background: rgba(255,255,255,.7); }
.hero-points { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 0; padding: 0; list-style: none; }
.hero-points li { padding: 7px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--green-dark); background: rgba(255,255,255,.78); font-size: 13px; font-weight: 800; }
.hero-visual { position: relative; }
.hero-image-wrap { overflow: hidden; border: 1px solid rgba(255,255,255,.8); border-radius: 46px 46px 90px 46px; background: white; box-shadow: var(--shadow); }
.hero-image-wrap img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; }
.size-badge { position: absolute; left: -28px; bottom: 26px; width: 118px; height: 118px; display: grid; place-content: center; text-align: center; border: 7px solid #fff; border-radius: 50%; color: white; background: var(--orange); box-shadow: 0 12px 30px rgba(154,92,15,.22); }
.size-badge strong { display: block; font-size: 19px; line-height: 1.25; }
.size-badge span { font-size: 12px; font-weight: 800; }

.intro-strip { color: #fff; background: var(--green-dark); }
.strip-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.strip-grid > div { display: grid; gap: 2px; padding: 24px 32px; text-align: center; border-right: 1px solid rgba(255,255,255,.16); }
.strip-grid > div:last-child { border: 0; }
.strip-grid strong { font-size: 19px; }
.strip-grid span { color: rgba(255,255,255,.72); font-size: 12px; }

.section { padding: 112px 0; }
.section-soft { background: var(--soft); }
.section-heading { max-width: 770px; margin: 0 auto 52px; text-align: center; }
.section-heading.compact { margin-bottom: 40px; }
.section h2, .cta-section h2 { font-size: clamp(32px, 4.2vw, 50px); }
.section-heading > p:last-child { color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: 0 10px 30px rgba(20,74,54,.06); }
.feature-image { background: #f4f7f5; }
.feature-image img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; }
.feature-body { padding: 26px 26px 30px; }
.feature-number { display: inline-grid; place-items: center; width: 42px; height: 28px; border-radius: 999px; color: #fff; background: var(--green); font-size: 12px; font-weight: 900; }
.feature-body h3 { margin: 15px 0 8px; font-size: 21px; line-height: 1.35; }
.feature-body p { margin: 0; color: var(--muted); font-size: 14px; }

.howto-grid { display: grid; grid-template-columns: .92fr 1.08fr; align-items: center; gap: 72px; }
.howto-image { overflow: hidden; border-radius: 36px; box-shadow: var(--shadow); background: white; }
.howto-image img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; }
.steps { display: grid; gap: 18px; margin: 38px 0 0; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 48px 1fr; gap: 16px; align-items: start; padding-bottom: 18px; border-bottom: 1px solid #cfddd6; }
.steps li:last-child { border: 0; }
.steps > li > span { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--green); font-weight: 900; }
.steps h3, .steps p { margin: 0; }
.steps h3 { font-size: 17px; }
.steps p { color: var(--muted); font-size: 14px; }

.spec-grid { display: grid; grid-template-columns: 1fr .9fr; align-items: center; gap: 70px; }
.spec-list { margin: 36px 0 0; border-top: 1px solid var(--line); }
.spec-list div { display: grid; grid-template-columns: 150px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.spec-list dt { color: var(--muted); font-size: 14px; font-weight: 700; }
.spec-list dd { margin: 0; font-weight: 800; }
.spec-note { margin: 14px 0 0; color: var(--muted); font-size: 12px; }
.spec-image { overflow: hidden; border: 1px solid var(--line); border-radius: 36px; background: #f4f8f6; }
.spec-image img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; }

.scene-section { padding-top: 60px; }
.scene-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.scene-grid figure { margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: white; }
.scene-grid img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; }
.scene-grid figcaption { padding: 18px 22px; font-weight: 800; text-align: center; }

.cta-section { padding: 76px 0; color: #fff; background: linear-gradient(135deg, var(--green-dark), #1f7b5c); }
.cta-inner { display: flex; justify-content: space-between; align-items: center; gap: 48px; }
.eyebrow.light { color: #b9e8d5; }
.cta-section p:not(.eyebrow) { margin: 14px 0 0; color: rgba(255,255,255,.73); }
.button-amazon { flex: none; color: #3f2707; background: #ffba4a; box-shadow: 0 12px 30px rgba(0,0,0,.18); }
.button-amazon:hover { background: #ffc86d; }

.related-section { padding-block: 88px; }
.related-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.related-links a { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 20px 22px; border: 1px solid var(--line); border-radius: 16px; text-decoration: none; transition: border-color .2s, transform .2s; }
.related-links a:hover { transform: translateY(-2px); border-color: var(--green); }
.related-links span { font-weight: 800; }
.related-links b { flex: none; color: var(--green); font-size: 13px; }

.site-footer { padding: 36px 0 96px; color: rgba(255,255,255,.72); background: #18231f; }
.footer-inner { display: flex; justify-content: space-between; gap: 40px; align-items: end; }
.footer-inner strong { color: white; font-size: 18px; }
.footer-inner p { margin: 4px 0 0; font-size: 11px; }
.mobile-buy { display: none; }

@media (max-width: 860px) {
  .desktop-nav { display: none; }
  .hero { padding: 64px 0; }
  .hero-grid, .howto-grid, .spec-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-copy { text-align: center; }
  .hero-actions, .hero-points { justify-content: center; }
  .hero-lead { margin-inline: auto; }
  .hero-visual { width: min(520px, 100%); margin-inline: auto; }
  .size-badge { left: -10px; }
  .feature-grid { grid-template-columns: 1fr; max-width: 560px; margin-inline: auto; }
  .feature-card { display: grid; grid-template-columns: .9fr 1.1fr; }
  .scene-grid { gap: 16px; }
  .cta-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 620px) {
  .container { width: min(100% - 28px, 1120px); }
  .header-inner { height: 64px; }
  .hero h1 { font-size: 42px; }
  .hero-lead { font-size: 15px; }
  .desktop-only { display: none; }
  .button { width: 100%; }
  .strip-grid { grid-template-columns: 1fr; padding-block: 6px; }
  .strip-grid > div { padding: 16px 20px; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.16); }
  .section { padding: 78px 0; }
  .feature-card { display: block; }
  .howto-grid, .spec-grid { gap: 34px; }
  .spec-list div { grid-template-columns: 110px 1fr; gap: 12px; }
  .scene-grid, .related-links { grid-template-columns: 1fr; }
  .footer-inner { display: grid; gap: 22px; }
  .site-footer { padding-bottom: 100px; }
  .mobile-buy { position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; display: block; padding: 10px 14px calc(10px + env(safe-area-inset-bottom)); background: rgba(255,255,255,.94); border-top: 1px solid var(--line); backdrop-filter: blur(12px); }
  .mobile-buy a { min-height: 50px; display: flex; align-items: center; justify-content: center; gap: 8px; border-radius: 999px; color: #fff; background: var(--green); font-weight: 900; text-decoration: none; }
}

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