:root {
  --ink: #12201e;
  --muted: #5d6865;
  --paper: #f7f7f2;
  --white: #ffffff;
  --line: #dce1d9;
  --teal: #0d9488;
  --teal-deep: #0f5f59;
  --amber: #e2a336;
  --coral: #dc6b55;
  --charcoal: #111716;
  --shadow: 0 24px 70px rgba(17, 23, 22, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Inter", "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.75;
}

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

button,
select,
textarea {
  font: inherit;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 18px clamp(18px, 4vw, 56px);
  color: var(--white);
  transition: background 180ms ease, box-shadow 180ms ease, color 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(247, 247, 242, 0.94);
  color: var(--ink);
  box-shadow: 0 14px 40px rgba(17, 23, 22, 0.08);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  font-weight: 760;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 8px;
  font-size: 16px;
}

.nav {
  display: flex;
  gap: clamp(16px, 3vw, 34px);
  font-size: 14px;
  font-weight: 650;
}

.header-cta {
  justify-self: end;
  border: 1px solid currentColor;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 720;
}

.hero {
  position: relative;
  min-height: 92svh;
  display: grid;
  align-items: center;
  overflow: hidden;
  background: var(--charcoal);
  color: var(--white);
}

.hero-canvas,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-canvas {
  opacity: 0.92;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(17, 23, 22, 0.96) 0%, rgba(17, 23, 22, 0.84) 34%, rgba(17, 23, 22, 0.36) 72%, rgba(17, 23, 22, 0.62) 100%),
    linear-gradient(180deg, rgba(17, 23, 22, 0.1) 0%, rgba(17, 23, 22, 0.68) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(760px, calc(100% - 36px));
  margin-left: clamp(18px, 7vw, 110px);
  padding: 128px 0 58px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--amber);
  font-size: 12px;
  font-weight: 780;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 24px;
  max-width: 11.5em;
  font-size: clamp(42px, 7.3vw, 84px);
  line-height: 1.04;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4.5vw, 52px);
  line-height: 1.16;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.35;
}

.hero-lead {
  max-width: 680px;
  margin-bottom: 34px;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(17px, 2vw, 21px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 54px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 11px 18px;
  font-weight: 760;
  line-height: 1.25;
  cursor: pointer;
}

.button.primary {
  background: var(--teal);
  color: var(--white);
  box-shadow: 0 16px 38px rgba(13, 148, 136, 0.28);
}

.button.secondary {
  border-color: rgba(255, 255, 255, 0.46);
  color: var(--white);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 150px));
  gap: 12px;
  max-width: 500px;
  margin: 0;
}

.hero-metrics div {
  border-left: 1px solid rgba(255, 255, 255, 0.28);
  padding-left: 16px;
}

.hero-metrics dt {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.1;
}

.hero-metrics dd {
  margin: 4px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.section,
.band,
.diagnosis {
  padding: clamp(72px, 10vw, 132px) clamp(18px, 5vw, 70px);
}

.section-heading {
  max-width: 840px;
  margin-bottom: 36px;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.intro-grid article,
.flow article {
  min-height: 240px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 28px;
  box-shadow: 0 12px 36px rgba(17, 23, 22, 0.06);
}

.icon,
.flow span {
  display: inline-grid;
  width: 42px;
  height: 42px;
  margin-bottom: 28px;
  place-items: center;
  border-radius: 8px;
  background: #e9f5f2;
  color: var(--teal-deep);
  font-size: 13px;
  font-weight: 800;
}

.intro-grid p,
.flow p,
.section-copy,
.diagnosis-copy p,
.result-panel p,
.site-footer p {
  color: var(--muted);
}

.band {
  background: var(--ink);
  color: var(--white);
}

.band .section-heading {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.flow article {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: none;
}

.flow p {
  color: rgba(255, 255, 255, 0.72);
}

.flow span {
  background: rgba(226, 163, 54, 0.16);
  color: var(--amber);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(320px, 1fr);
  gap: clamp(28px, 6vw, 90px);
  align-items: start;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  border-bottom: 1px solid var(--line);
  padding: 0 0 14px 30px;
  font-weight: 650;
}

.check-list li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 12px;
  height: 12px;
  border: 3px solid var(--teal);
  border-top: 0;
  border-left: 0;
  transform: rotate(45deg);
}

.diagnosis {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(320px, 1fr);
  gap: clamp(28px, 6vw, 82px);
  background: #fffdfa;
}

.diagnosis-copy {
  position: sticky;
  top: 108px;
  align-self: start;
}

.result-panel {
  margin-top: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 24px;
  box-shadow: var(--shadow);
}

.result-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 780;
  letter-spacing: 0.12em;
}

.result-panel strong {
  display: block;
  margin-bottom: 8px;
  color: var(--teal-deep);
  font-size: 26px;
  line-height: 1.25;
}

.diagnosis-form {
  display: grid;
  gap: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: clamp(22px, 4vw, 34px);
  box-shadow: var(--shadow);
}

.diagnosis-form label,
.diagnosis-form fieldset {
  display: grid;
  gap: 8px;
  margin: 0;
}

.diagnosis-form label > span,
.diagnosis-form legend {
  color: var(--ink);
  font-size: 14px;
  font-weight: 760;
}

.diagnosis-form select,
.diagnosis-form textarea {
  width: 100%;
  border: 1px solid #cdd6d0;
  border-radius: 8px;
  background: #fbfcfa;
  color: var(--ink);
  padding: 12px 13px;
}

.diagnosis-form select:focus,
.diagnosis-form textarea:focus,
.button:focus-visible,
.header-cta:focus-visible,
.nav a:focus-visible {
  outline: 3px solid rgba(13, 148, 136, 0.28);
  outline-offset: 2px;
}

.diagnosis-form fieldset {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.checkbox {
  grid-template-columns: 20px 1fr;
  align-items: start;
  color: var(--muted);
}

.checkbox input {
  width: 18px;
  height: 18px;
  margin: 5px 0 0;
  accent-color: var(--teal);
}

.form-submit {
  width: 100%;
  margin-top: 4px;
}

.mail-link {
  display: none;
  justify-self: center;
  color: var(--teal-deep);
  font-weight: 760;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.mail-link.is-visible {
  display: inline-block;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 34px clamp(18px, 5vw, 70px);
  background: var(--charcoal);
  color: var(--white);
}

.site-footer p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.66);
}

.site-footer a {
  align-self: center;
  color: var(--amber);
  font-weight: 720;
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav {
    display: none;
  }

  .hero {
    min-height: 94svh;
  }

  .hero-content {
    margin-left: 18px;
    padding-top: 118px;
  }

  .hero-metrics,
  .intro-grid,
  .flow,
  .split,
  .diagnosis {
    grid-template-columns: 1fr;
  }

  .diagnosis-copy {
    position: static;
  }
}

@media (max-width: 560px) {
  .site-header {
    padding: 14px 16px;
  }

  .brand span:last-child {
    display: none;
  }

  .header-cta {
    padding: 8px 12px;
  }

  .hero-content {
    width: calc(100% - 32px);
  }

  h1 {
    font-size: 42px;
  }

  .hero-actions {
    display: grid;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
    max-width: 260px;
  }

  .site-footer {
    display: grid;
  }

  .site-footer a {
    align-self: start;
  }
}