:root {
  --ink: #15324a;
  --muted: #667481;
  --line: #dbe6ed;
  --paper: #ffffff;
  --mist: #edf6f7;
  --aqua: #0f8f9a;
  --aqua-dark: #0b6773;
  --navy: #0d2f4d;
  --coral: #d76e5b;
  --gold: #b28a42;
  --shadow: 0 20px 60px rgba(15, 55, 75, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f8fbfc;
  font-family:
    -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic",
    "Noto Sans JP", "Segoe UI", sans-serif;
  line-height: 1.7;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  min-height: 76px;
  padding: 14px clamp(18px, 5vw, 64px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(219, 230, 237, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 178px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: var(--navy);
  border-radius: 8px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  line-height: 1.1;
  letter-spacing: 0;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  justify-content: center;
  gap: clamp(14px, 3vw, 32px);
  color: #31475a;
  font-size: 14px;
  font-weight: 700;
}

.nav a {
  padding: 8px 0;
}

.header-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 800;
  line-height: 1.3;
}

.header-cta {
  color: #fff;
  background: var(--aqua);
  box-shadow: 0 12px 24px rgba(15, 143, 154, 0.18);
}

.hero {
  position: relative;
  min-height: calc(100svh - 76px);
  display: grid;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(6, 25, 42, 0.86) 0%, rgba(13, 47, 77, 0.74) 38%, rgba(13, 47, 77, 0.2) 78%),
    linear-gradient(0deg, rgba(6, 25, 42, 0.35), rgba(6, 25, 42, 0.02));
}

.hero-content {
  width: min(760px, calc(100% - 36px));
  margin-left: clamp(18px, 7vw, 88px);
  padding: 68px 0;
  color: #fff;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--aqua);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #8fe6e9;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(40px, 7vw, 76px);
  line-height: 1.06;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.22;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: 0;
}

.lead {
  max-width: 620px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(17px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.btn-primary {
  color: #fff;
  background: var(--coral);
  box-shadow: 0 18px 36px rgba(215, 110, 91, 0.28);
}

.btn-secondary {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.44);
  background: rgba(255, 255, 255, 0.12);
}

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.hero-proof span {
  padding: 8px 12px;
  color: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 13px;
  font-weight: 700;
}

section:not(.hero) {
  padding: clamp(70px, 9vw, 120px) clamp(18px, 5vw, 72px);
}

.band {
  background: var(--mist);
}

.section-head {
  width: min(1120px, 100%);
  margin: 0 auto 36px;
}

.section-head.narrow {
  width: min(820px, 100%);
  text-align: center;
}

.section-head p:not(.eyebrow),
.product-copy p,
.closing p {
  color: var(--muted);
  font-size: 17px;
}

.section-head.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 30px;
  align-items: end;
}

.issue-grid,
.problem-grid,
.reason-grid,
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  width: min(1120px, 100%);
  margin: 0 auto;
}

.issue-card,
.validation-panel,
.problem-grid article,
.reason-card,
.case-card,
.influencer-card,
.product-panel,
details,
.trial-box {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.problem-grid article {
  min-height: 96px;
  display: grid;
  place-items: center;
  padding: 22px;
  color: var(--navy);
  font-weight: 800;
  text-align: center;
}

.issue-card {
  padding: 26px;
}

.issue-tag {
  display: inline-block;
  margin-bottom: 14px;
  padding: 5px 10px;
  color: #fff;
  background: var(--aqua-dark);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
}

.issue-card > p {
  color: var(--muted);
  margin-bottom: 18px;
}

.evidence-stack {
  display: grid;
  gap: 10px;
  padding: 16px;
  background: #f5fafb;
  border: 1px solid #d7e7ea;
  border-radius: 8px;
}

.evidence-stack h4 {
  margin: 0;
  color: var(--navy);
  font-size: 13px;
  line-height: 1.4;
}

.evidence-stack ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 14px;
}

.evidence-stack p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.validation-panel {
  display: grid;
  grid-template-columns: minmax(220px, 0.44fr) minmax(0, 1fr);
  gap: 28px;
  width: min(1120px, 100%);
  margin: 24px auto 0;
  padding: 28px;
}

.validation-panel h3 {
  font-size: 24px;
}

.validation-panel ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.reason-card {
  padding: 28px;
}

.reason-card .num {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--gold);
  font-size: 14px;
  font-weight: 900;
}

.reason-card p,
.case-card p,
.influencer-card p,
.faq p {
  color: var(--muted);
}

.sns {
  border-top: 1px solid #d7e7ea;
  border-bottom: 1px solid #d7e7ea;
}

.influencer-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  width: min(1280px, 100%);
  margin: 0 auto;
}

.influencer-card {
  min-height: 330px;
  padding: 18px;
}

.avatar {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 14px;
  color: #fff;
  background: var(--aqua-dark);
  border-radius: 50%;
  font-weight: 900;
}

dl {
  margin: 16px 0 0;
}

dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

dd {
  margin: 0 0 8px;
  color: var(--ink);
  font-weight: 800;
}

.quote {
  min-height: 62px;
  margin: 14px 0;
  padding: 12px;
  background: #f4f8fa;
  border-radius: 8px;
  font-size: 13px;
}

.influencer-card a {
  color: var(--aqua-dark);
  font-weight: 900;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.note {
  width: min(1120px, 100%);
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 13px;
}

.case-card {
  padding: 28px;
}

.case-label {
  display: inline-block;
  margin: 0 0 12px;
  padding: 5px 10px;
  color: #fff;
  background: var(--navy);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
}

.product {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(320px, 0.82fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
}

.product-copy,
.product-panel,
.trial-box,
.closing {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.product-panel {
  padding: 28px;
}

.product-panel dl {
  margin: 0;
}

.product-panel div {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.product-panel div:last-child {
  border-bottom: 0;
}

.trial {
  background: var(--navy);
}

.trial-box {
  padding: clamp(30px, 6vw, 58px);
}

.trial-box h2 {
  max-width: 820px;
}

.trial-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 0;
  margin: 26px 0 0;
  list-style: none;
}

.trial-list li {
  min-height: 76px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--navy);
  background: #f8fbfc;
  font-weight: 800;
}

.flow-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.flow-list li {
  min-height: 104px;
  display: grid;
  align-content: center;
  gap: 8px;
  padding: 18px;
  color: var(--navy);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 900;
}

.flow-list span {
  color: var(--aqua);
  font-size: 14px;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  width: min(1120px, 100%);
  margin: 0 auto;
}

details {
  padding: 22px;
}

summary {
  cursor: pointer;
  color: var(--navy);
  font-weight: 900;
}

.closing {
  text-align: center;
}

.closing .hero-actions {
  justify-content: center;
}

.closing .btn-secondary {
  color: var(--navy);
  border-color: var(--line);
  background: #fff;
}

@media (max-width: 1040px) {
  .site-header {
    grid-template-columns: auto auto;
  }

  .nav {
    display: none;
  }

  .influencer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .trial-list,
  .flow-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .hero {
    min-height: auto;
  }

  .hero-shade {
    background:
      linear-gradient(180deg, rgba(6, 25, 42, 0.86) 0%, rgba(13, 47, 77, 0.76) 55%, rgba(13, 47, 77, 0.52) 100%),
      rgba(6, 25, 42, 0.25);
  }

  .hero-content {
    width: calc(100% - 36px);
    margin: 0 auto;
    padding: 72px 0 86px;
  }

  .section-head.split,
  .product {
    grid-template-columns: 1fr;
  }

  .issue-grid,
  .problem-grid,
  .reason-grid,
  .case-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .validation-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .site-header {
    min-height: 66px;
    padding: 10px 14px;
    gap: 12px;
  }

  .brand {
    min-width: 0;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .brand small {
    display: none;
  }

  .header-cta {
    min-height: 40px;
    padding: 9px 12px;
    font-size: 13px;
  }

  h1 {
    font-size: 38px;
  }

  .hero-actions,
  .closing .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  section:not(.hero) {
    padding: 60px 16px;
  }

  .influencer-grid,
  .trial-list,
  .flow-list {
    grid-template-columns: 1fr;
  }

  .influencer-card {
    min-height: auto;
  }
}