:root {
  --bg: #ffffff;
  --bg-soft: #f8f8f8;
  --text: #111111;
  --text-soft: #666666;
  --line: #e9e9e9;
  --card: rgba(255, 255, 255, 0.9);
  --shadow: 0 18px 50px rgba(17, 17, 17, 0.06);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 85% 15%, rgba(255,255,255,1) 0%, rgba(250,250,250,1) 34%, rgba(255,255,255,1) 72%),
    linear-gradient(180deg, #ffffff 0%, #fbfbfb 100%);
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.narrow { width: min(880px, calc(100% - 40px)); }
.section { padding: 110px 0; }
.section-muted { background: linear-gradient(180deg, rgba(248,248,248,0.8) 0%, rgba(255,255,255,0.92) 100%); }
.section-label {
  margin: 0 0 14px;
  color: var(--text-soft);
  font-size: 13px;
  letter-spacing: 0.14em;
  font-weight: 700;
}
.section-lead {
  color: var(--text-soft);
  font-size: 18px;
}

h1, h2, h3, p { margin-top: 0; }
h1 {
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
}
h2 {
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}
h3 {
  font-size: 22px;
  line-height: 1.35;
  margin-bottom: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid rgba(233, 233, 233, 0.85);
}
.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 24px;
}
.brand {
  font-weight: 800;
  letter-spacing: 0.04em;
}
.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}
.nav a {
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 500;
}

.hero {
  padding: 72px 0 88px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 48px;
  align-items: center;
  min-height: calc(100vh - 140px);
}
.eyebrow {
  margin-bottom: 18px;
  color: var(--text-soft);
  font-size: 13px;
  letter-spacing: 0.16em;
  font-weight: 700;
}
.hero-lead {
  font-size: 19px;
  color: var(--text-soft);
  margin-bottom: 28px;
}
.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}
.hero-points span,
.trust-badges div {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.82);
  border-radius: 999px;
  padding: 11px 16px;
  font-size: 14px;
  color: var(--text-soft);
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 18px;
}
.cta-row.center { justify-content: center; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  border: 1px solid transparent;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn-dark {
  background: #121212;
  color: #ffffff;
  box-shadow: 0 16px 30px rgba(17, 17, 17, 0.14);
}
.btn-light {
  background: rgba(255,255,255,0.86);
  border-color: var(--line);
}
.btn-sm { min-height: 42px; padding: 0 16px; font-size: 14px; }
.micro-note {
  font-size: 12px;
  color: #888888;
}

.hero-visual {
  display: flex;
  justify-content: center;
}
.product-card {
  position: relative;
  width: min(460px, 100%);
  padding: 26px;
  border: 1px solid rgba(233,233,233,0.9);
  border-radius: 38px;
  background: rgba(255,255,255,0.74);
  box-shadow: var(--shadow);
}
.product-card::before {
  content: "";
  position: absolute;
  inset: 14px;
  border-radius: 30px;
  border: 1px solid rgba(241,241,241,0.95);
  pointer-events: none;
}
.product-placeholder {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 520px;
  border-radius: 28px;
  background: radial-gradient(circle at 50% 20%, rgba(255,255,255,1) 0%, rgba(247,247,247,1) 65%, rgba(255,255,255,1) 100%);
  overflow: hidden;
}
.product-placeholder img {
  width: 88%;
  max-width: 320px;
}
.product-shadow {
  position: absolute;
  bottom: 44px;
  width: 58%;
  height: 42px;
  background: rgba(17,17,17,0.12);
  filter: blur(20px);
  border-radius: 999px;
}
.product-meta {
  display: grid;
  gap: 4px;
  padding-top: 16px;
}
.product-meta p {
  margin-bottom: 0;
  color: var(--text-soft);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.feature-grid,
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 42px;
}
.feature-card,
.step-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.82);
  box-shadow: var(--shadow);
}
.feature-no,
.step-card span {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
}
.feature-card p,
.step-card p,
.check-item span,
.trust-panel p,
.site-footer p,
.faq-list p,
.faq-long p {
  color: var(--text-soft);
}

.split-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 46px;
  align-items: start;
}
.check-list {
  display: grid;
  gap: 16px;
}
.check-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.check-item strong {
  font-size: 16px;
}

.trust-panel,
.cta-panel {
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(249,249,249,0.92) 100%);
  box-shadow: var(--shadow);
}
.trust-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 30px;
  align-items: center;
}
.trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-start;
}

.faq-grid {
  align-items: start;
}
.faq-list,
.faq-long {
  display: grid;
  gap: 14px;
}
.faq-list details,
.faq-long details {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px 20px;
  background: rgba(255,255,255,0.86);
}
summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+";
  float: right;
  color: var(--text-soft);
}
 details[open] summary::after { content: "−"; }

.center-stack {
  text-align: center;
}
.site-footer {
  padding: 34px 0 60px;
  border-top: 1px solid var(--line);
}
.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  color: var(--text-soft);
}

@media (max-width: 1024px) {
  .hero-grid,
  .split-grid,
  .trust-panel,
  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 36px;
  }

  .hero-grid {
    min-height: auto;
  }

  .product-placeholder {
    min-height: 420px;
  }

  .check-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

@media (max-width: 720px) {
  .container,
  .narrow {
    width: min(var(--max), calc(100% - 28px));
  }

  .nav-row {
    min-height: auto;
    padding: 14px 0;
    align-items: flex-start;
  }

  .nav {
    gap: 14px;
  }

  .hero-points,
  .cta-row,
  .trust-badges,
  .footer-grid,
  .footer-links {
    flex-direction: column;
    align-items: stretch;
  }

  .btn,
  .btn-sm {
    width: 100%;
  }

  .product-card,
  .trust-panel,
  .cta-panel,
  .feature-card,
  .step-card {
    padding: 22px;
  }

  .section {
    padding: 82px 0;
  }
}
/* comparison section */
.comparison-head {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 42px;
  align-items: end;
  margin-bottom: 42px;
}

.comparison-lead {
  margin-bottom: 0;
}

.comparison-list {
  display: grid;
  gap: 24px;
}

.comparison-card {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 28px;
  align-items: center;
  padding: 26px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.88);
  box-shadow: var(--shadow);
}

.comparison-card-reverse .comparison-media {
  order: 2;
}

.comparison-card-reverse .comparison-copy {
  order: 1;
}

.comparison-media img {
  width: 100%;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: #f6f6f6;
  box-shadow: 0 18px 42px rgba(17, 17, 17, 0.08);
}

.comparison-legend {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.comparison-legend span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.9);
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 600;
}

.comparison-kicker {
  margin-bottom: 10px;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.comparison-copy h3 {
  font-size: 30px;
  line-height: 1.25;
  margin-bottom: 14px;
}

.comparison-copy p:last-child {
  margin-bottom: 0;
  color: var(--text-soft);
}

.comparison-note {
  display: grid;
  gap: 6px;
  margin-top: 18px;
}

.comparison-note p {
  margin-bottom: 0;
  color: #8a8a8a;
  font-size: 12px;
}

@media (max-width: 1024px) {
  .comparison-head,
  .comparison-card {
    grid-template-columns: 1fr;
  }

  .comparison-card-reverse .comparison-media,
  .comparison-card-reverse .comparison-copy {
    order: initial;
  }
}

@media (max-width: 720px) {
  .comparison-card {
    padding: 22px;
  }

  .comparison-copy h3 {
    font-size: 24px;
  }
}