:root {
  color-scheme: light;
  --bg: #f7f8f7;
  --surface: #ffffff;
  --surface-muted: #edf1ee;
  --text: #18231f;
  --muted: #56645e;
  --line: #d8dfda;
  --green: #247451;
  --green-dark: #15553a;
  --green-soft: #dff1e7;
  --charcoal: #22302b;
  --orange: #d86b2b;
  --shadow: 0 18px 44px rgba(24, 35, 31, 0.08);
  --radius: 22px;
  --content: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 280px;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--green-dark);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--green);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(36, 116, 81, 0.38);
  outline-offset: 4px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  transform: translateY(-160%);
  border-radius: 8px;
  background: var(--charcoal);
  color: #fff;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(216, 223, 218, 0.9);
  background: rgba(247, 248, 247, 0.94);
  backdrop-filter: blur(12px);
}

.header-inner,
.footer-inner,
.container {
  width: min(calc(100% - 40px), var(--content));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 11px;
  color: var(--charcoal);
  font-size: 1.02rem;
  font-weight: 750;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  background: var(--charcoal);
  color: #fff;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.site-nav ul,
.footer-links {
  display: flex;
  margin: 0;
  padding: 0;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 8px 11px;
  border-radius: 9px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--green-soft);
  color: var(--green-dark);
}

main {
  overflow: hidden;
}

.hero {
  position: relative;
  padding: 104px 0 88px;
}

.hero::after {
  position: absolute;
  z-index: -1;
  top: -160px;
  right: -160px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(36, 116, 81, 0.13), transparent 68%);
  content: "";
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  align-items: center;
  gap: 64px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--charcoal);
  line-height: 1.25;
  letter-spacing: -0.025em;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(2.5rem, 7vw, 5.2rem);
  line-height: 1.02;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(1.75rem, 4vw, 2.55rem);
}

h3 {
  margin-bottom: 10px;
  font-size: 1.16rem;
}

.hero-copy {
  max-width: 710px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
}

.hero-tagline {
  display: block;
  margin-bottom: 10px;
  color: var(--text);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 720;
}

.button-row {
  display: flex;
  margin-top: 32px;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  padding: 11px 19px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--green-dark);
  border-radius: 12px;
  background: var(--green-dark);
  color: #fff;
  font-weight: 750;
  text-decoration: none;
  transition: transform 150ms ease, background 150ms ease;
}

.button:hover {
  background: var(--green);
  color: #fff;
  transform: translateY(-1px);
}

.button.secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--charcoal);
}

.button.secondary:hover {
  border-color: var(--green);
  background: var(--green-soft);
  color: var(--green-dark);
}

.app-preview {
  position: relative;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.preview-screen {
  display: grid;
  min-height: 360px;
  padding: 28px;
  align-content: space-between;
  border-radius: 22px;
  background: var(--charcoal);
  color: #fff;
}

.preview-label {
  color: #b9c7c1;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.preview-expression {
  font-size: clamp(3.2rem, 9vw, 5.3rem);
  font-weight: 300;
  letter-spacing: -0.06em;
  line-height: 1;
  text-align: right;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.preview-key {
  display: grid;
  aspect-ratio: 1.35;
  place-items: center;
  border-radius: 9px;
  background: #3d4a45;
  font-weight: 750;
}

.preview-key.accent {
  background: var(--orange);
}

.section {
  padding: 84px 0;
}

.section.compact {
  padding: 58px 0;
}

.section.muted {
  border-block: 1px solid var(--line);
  background: var(--surface-muted);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading p,
.lead,
.card p,
.prose p,
.prose li {
  color: var(--muted);
}

.section-heading p,
.lead {
  margin: 0;
  font-size: 1.08rem;
}

.grid-2,
.grid-3,
.feature-grid {
  display: grid;
  gap: 20px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.card p:last-child,
.prose p:last-child {
  margin-bottom: 0;
}

.card.featured {
  border-color: rgba(36, 116, 81, 0.34);
  box-shadow: var(--shadow);
}

.icon-tile {
  display: grid;
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
  place-items: center;
  border-radius: 12px;
  background: var(--green-soft);
  color: var(--green-dark);
  font-size: 1.15rem;
  font-weight: 850;
}

.status {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--green-soft);
  color: var(--green-dark);
  font-size: 0.77rem;
  font-weight: 800;
}

.status.planned {
  background: #eceeed;
  color: #5b6661;
}

.feature-list,
.check-list,
.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 22px;
}

.feature-list li,
.check-list li {
  position: relative;
  padding-left: 25px;
}

.feature-list li::before,
.check-list li::before {
  position: absolute;
  top: 0.78em;
  left: 2px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  content: "";
}

.credentials {
  display: flex;
  margin-top: 20px;
  padding: 0;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.credentials li {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.85rem;
}

.page-hero {
  padding: 76px 0 54px;
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  margin-bottom: 16px;
  font-size: clamp(2.35rem, 7vw, 4.5rem);
}

.page-hero .lead {
  max-width: 760px;
}

.prose {
  max-width: 850px;
}

.prose h2 {
  margin-top: 56px;
  padding-top: 8px;
  font-size: 1.65rem;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  margin-top: 30px;
}

.prose ul,
.prose ol {
  padding-left: 1.4em;
}

.note {
  margin: 26px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--green);
  border-radius: 0 12px 12px 0;
  background: var(--green-soft);
}

.note p {
  margin: 0;
  color: var(--green-dark);
}

.contact-panel {
  display: grid;
  margin-top: 30px;
  padding: 28px;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.contact-panel strong {
  color: var(--charcoal);
  font-size: 1.1rem;
}

.contact-pending {
  display: inline-flex;
  width: fit-content;
  padding: 7px 11px;
  border-radius: 8px;
  background: var(--surface-muted);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.faq {
  display: grid;
  gap: 12px;
}

.faq details {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.faq summary {
  padding: 18px 50px 18px 20px;
  cursor: pointer;
  font-weight: 750;
}

.faq details p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--muted);
}

.lang-en {
  color: #65736d;
  font-size: 0.94em;
}

.site-footer {
  padding: 38px 0;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.copyright {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links {
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.88rem;
  text-decoration: none;
}

@media (max-width: 820px) {
  .header-inner {
    min-height: auto;
    padding: 13px 0 11px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav ul {
    width: max-content;
  }

  .site-nav a {
    padding: 7px 10px;
  }

  .hero {
    padding: 70px 0;
  }

  .hero-grid,
  .grid-2,
  .grid-3,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 44px;
  }

  .app-preview {
    max-width: 520px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 540px) {
  .header-inner,
  .footer-inner,
  .container {
    width: min(calc(100% - 28px), var(--content));
  }

  .hero,
  .section {
    padding: 58px 0;
  }

  .page-hero {
    padding: 54px 0 42px;
  }

  .site-nav a {
    padding-inline: 7px;
    font-size: 0.84rem;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .card,
  .app-preview {
    padding: 22px;
    border-radius: 18px;
  }

  .preview-screen {
    min-height: 300px;
    padding: 22px;
  }

  .button-row,
  .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}