:root {
  color-scheme: light;
  --bg: #ffffff;
  --text: #1f2933;
  --muted: #5f6b7a;
  --line: #e5e7eb;
  --soft: #f6f7f9;
  --accent: #0f766e;
  --brand: #16b894;
  --brand-soft: #e1f5ee;
  --brand-ink: #0f6e56;
  --max: 920px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  display: flex;
  flex-direction: column;
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.75;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header,
.site-footer,
main {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
}

main {
  flex: 1;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--text);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand:hover {
  text-decoration: none;
}

.brand-logo {
  display: block;
}

.desktop-nav,
.mobile-nav nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 20px;
  justify-content: flex-end;
  font-size: 14px;
}

.mobile-nav {
  display: none;
}

.hero {
  padding: 72px 0 60px;
  text-align: center;
}

.hero-icon {
  display: block;
  width: 96px;
  height: 96px;
  margin: 0 auto 22px;
  border-radius: 22px;
  border: 1px solid var(--line);
}

.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 20px;
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1.2;
  letter-spacing: 0;
}

.hero h1 {
  margin-left: auto;
  margin-right: auto;
}

.lead {
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
}

.hero .lead {
  margin-left: auto;
  margin-right: auto;
}

.cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: 12px;
  background: #111418;
  color: #ffffff;
  text-decoration: none;
  cursor: pointer;
}

.store-badge-logo {
  width: 24px;
  height: 24px;
}

.store-badge-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.15;
  font-size: 18px;
  font-weight: 600;
}

.store-badge-text small {
  font-size: 10px;
  font-weight: 400;
  opacity: 0.85;
}

.store-note {
  color: var(--muted);
  font-size: 13px;
}

.status {
  display: inline-block;
  margin-top: 12px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

h2 {
  margin-bottom: 20px;
  font-size: 26px;
  line-height: 1.35;
}

h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

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

.grid article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--soft);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 14px;
  border-radius: 12px;
  background: var(--brand-soft);
  color: var(--brand-ink);
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

.grid p,
.list,
details p,
.doc p,
.doc li {
  color: var(--muted);
}

.list {
  padding-left: 1.2em;
}

.section-lead {
  margin-top: -6px;
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 16px;
}

.use-cases {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.use-case {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--bg);
}

.use-case-img {
  display: block;
  width: 100%;
  height: auto;
  background: #f9f5ec;
}

.use-case-body {
  padding: 18px 20px 20px;
}

.use-case h3 {
  margin-bottom: 6px;
}

.use-case p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

details {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

details:last-child {
  border-bottom: 1px solid var(--line);
}

summary {
  cursor: pointer;
  font-weight: 700;
}

.doc {
  max-width: 760px;
  padding: 56px 0;
}

.doc h1 {
  font-size: clamp(30px, 7vw, 44px);
}

.doc h2 {
  margin-top: 36px;
  margin-bottom: 10px;
  font-size: 22px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  margin-left: 14px;
}

@media (max-width: 700px) {
  .site-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .site-footer {
    display: block;
  }

  .desktop-nav {
    display: none;
  }

  .mobile-nav {
    display: block;
    padding: 0;
    border: 0;
  }

  .mobile-nav:last-child {
    border-bottom: 0;
  }

  .mobile-nav summary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--text);
    list-style: none;
  }

  .mobile-nav summary::-webkit-details-marker {
    display: none;
  }

  .menu-icon,
  .menu-icon::before,
  .menu-icon::after {
    display: block;
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
  }

  .menu-icon {
    position: relative;
  }

  .menu-icon::before,
  .menu-icon::after {
    content: "";
    position: absolute;
    left: 0;
  }

  .menu-icon::before {
    top: -6px;
  }

  .menu-icon::after {
    top: 6px;
  }

  .mobile-nav nav {
    position: absolute;
    right: 16px;
    z-index: 10;
    flex-direction: column;
    min-width: 168px;
    margin-top: 8px;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--bg);
    box-shadow: 0 10px 24px rgba(31, 41, 51, 0.12);
    justify-content: flex-start;
  }

  .site-footer {
    padding-bottom: calc(96px + env(safe-area-inset-bottom));
  }

  .hero {
    padding: 56px 0 44px;
  }

  .grid,
  .use-cases {
    grid-template-columns: 1fr;
  }

  .site-footer p + p {
    margin-top: 10px;
  }

  .site-footer a {
    display: inline-block;
    margin: 0 14px 0 0;
  }
}

.contact-doc {
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.contact-form {
  max-width: 560px;
  margin: 28px auto 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.req {
  margin-left: 8px;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-ink);
  font-size: 11px;
  font-weight: 700;
}

.field-hint {
  color: var(--muted);
  font-size: 13px;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 16px;
}

.contact-form textarea {
  resize: vertical;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-soft);
}

.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-note {
  color: var(--muted);
  font-size: 13px;
  margin: 0;
}

.submit-btn {
  align-self: flex-start;
  padding: 12px 28px;
  border: none;
  border-radius: 10px;
  background: var(--brand);
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.submit-btn:hover {
  background: var(--brand-ink);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: default;
}

.form-status {
  margin: 0;
  font-size: 14px;
  min-height: 1.2em;
}

.form-status.is-error {
  color: #b3261e;
}

.form-done {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--brand-soft);
  color: var(--brand-ink);
  font-weight: 700;
}