:root {
  color-scheme: light dark;
  --brand: #34344a;
  --brand-soft: rgba(52, 52, 74, 0.08);
  --bg: #ffffff;
  --surface: #fafafa;
  --surface-raised: #ffffff;
  --text: #111111;
  --muted: #666666;
  --border: #eaeaea;
  --shadow: 0 18px 60px rgba(17, 17, 17, 0.06);
  --radius: 8px;
  --max: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101015;
    --surface: #15151c;
    --surface-raised: #191923;
    --text: #f5f5f7;
    --muted: #aaaab4;
    --border: #2a2a36;
    --shadow: 0 18px 60px rgba(0, 0, 0, 0.22);
    --brand-soft: rgba(126, 126, 156, 0.14);
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

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

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid color-mix(in srgb, var(--border), transparent 35%);
  background: color-mix(in srgb, var(--bg), transparent 12%);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(100% - 40px, var(--max));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 650;
}

.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.9rem;
}

.nav-links a,
.language-switch button {
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.nav-links a:hover {
  color: var(--text);
}

.language-switch {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-raised);
}

.language-switch button {
  min-width: 42px;
  min-height: 30px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
}

.language-switch button[aria-pressed="true"] {
  background: var(--brand);
  color: #ffffff;
}

.section {
  border-bottom: 1px solid var(--border);
}

.section-inner {
  width: min(100% - 40px, var(--max));
  margin: 0 auto;
  padding: 112px 0;
}

.hero .section-inner {
  min-height: calc(100svh - 72px);
  display: grid;
  align-content: center;
  padding: 84px 0;
}

.hero-logo {
  width: 72px;
  height: auto;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #ffffff;
  margin-bottom: 54px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--brand);
  font-size: 0.88rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 880px;
  margin-bottom: 20px;
  font-size: clamp(4rem, 11vw, 9.5rem);
  line-height: 0.92;
  font-weight: 720;
}

.hero-copy {
  max-width: 660px;
  color: var(--muted);
  font-size: clamp(1.25rem, 2.4vw, 2rem);
  line-height: 1.35;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 48px;
  align-items: start;
  margin-bottom: 52px;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 1;
  font-weight: 680;
}

.section-lead {
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.app-card,
.news-item,
.policy-card,
.not-found-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--shadow);
}

.app-card {
  overflow: hidden;
}

.app-thumb {
  position: relative;
  z-index: 0;
  min-height: 180px;
  background:
    linear-gradient(145deg, var(--surface) 0%, color-mix(in srgb, var(--brand), var(--surface) 8%) 100%);
  border-bottom: 1px solid var(--border);
}

.app-thumb-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.app-body {
  position: relative;
  z-index: 1;
  padding: 24px;
}

.app-icon {
  position: relative;
  z-index: 2;
  width: 54px;
  height: 54px;
  margin-top: -52px;
  margin-bottom: 22px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--brand);
  box-shadow: 0 12px 36px rgba(52, 52, 74, 0.18);
}

.app-icon-image {
  overflow: hidden;
  padding: 0;
  border-color: transparent;
  background: #ffffff;
  box-shadow: 0 12px 30px rgba(31, 37, 28, 0.16);
}

.app-icon-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.app-body h3 {
  margin-bottom: 8px;
  font-size: 1.24rem;
}

.muted {
  color: var(--muted);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-raised);
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button.primary {
  border-color: var(--brand);
  background: var(--brand);
  color: #ffffff;
}

.button:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--brand), var(--border) 30%);
}

.news-list {
  display: grid;
  gap: 12px;
}

.news-item {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 22px 24px;
}

.news-date {
  color: var(--muted);
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

.news-title {
  font-weight: 650;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer {
  background: var(--surface);
}

.footer-inner {
  width: min(100% - 40px, var(--max));
  margin: 0 auto;
  padding: 36px 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-logo {
  width: 38px;
  height: 38px;
  object-fit: contain;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.policy-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.privacy-page .policy-grid {
  grid-template-columns: minmax(0, 1fr);
}

.policy-card {
  padding: 30px;
}

.policy-card h2 {
  margin-bottom: 26px;
  font-size: 2rem;
}

.policy-card h3 {
  margin: 28px 0 8px;
  font-size: 1rem;
}

.page-hero .section-inner {
  padding: 96px 0 72px;
}

.article {
  max-width: 760px;
  margin: 0 auto;
}

.article h1 {
  font-size: clamp(2.6rem, 7vw, 5.4rem);
  line-height: 1;
}

.article-body {
  color: var(--muted);
  font-size: 1.08rem;
}

.not-found {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 40px 20px;
}

.not-found-panel {
  width: min(100%, 620px);
  padding: 44px;
}

.not-found-panel h1 {
  font-size: clamp(3rem, 10vw, 5.8rem);
  line-height: 0.96;
}

.fade-in {
  animation: fade-in 520ms ease both;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}

@media (max-width: 900px) {
  .nav {
    min-height: 66px;
  }

  .nav-links {
    gap: 12px;
  }

  .nav-links a {
    display: none;
  }

  .section-inner {
    padding: 78px 0;
  }

  .section-heading,
  .policy-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .app-grid {
    grid-template-columns: 1fr;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .nav,
  .section-inner,
  .footer-inner {
    width: min(100% - 28px, var(--max));
  }

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

  .hero-logo {
    width: 64px;
    margin-bottom: 34px;
  }

  .button-row,
  .contact-links {
    align-items: stretch;
    flex-direction: column;
  }

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

  .button {
    width: 100%;
  }

  .policy-card,
  .not-found-panel {
    padding: 24px;
  }
}