:root {
  --bg: #0b0d12;
  --bg-elevated: #12151c;
  --border: #23262f;
  --text: #eef0f4;
  --text-dim: #9aa0ac;
  --accent: #6ee7c7;
  --accent-dim: #3fa889;
  --max-width: 880px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f7f5;
    --bg-elevated: #ffffff;
    --border: #e4e4e0;
    --text: #17181c;
    --text-dim: #5b5f68;
    --accent: #0f9d78;
    --accent-dim: #0c7d60;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

header.site {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  z-index: 10;
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand .mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  flex-shrink: 0;
}

.brand-name-ja {
  font-size: 1.05rem;
}

.brand-name-en {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

nav.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

nav.site-nav a.navlink {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.9rem;
  transition: color 0.15s ease;
}

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

#lang-toggle {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 4px;
  font-size: 0.78rem;
  cursor: pointer;
  display: flex;
  gap: 2px;
}

#lang-toggle span {
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--text-dim);
}

html[data-lang="ja"] #lang-toggle span.opt-ja,
html[data-lang="en"] #lang-toggle span.opt-en {
  background: var(--accent);
  color: #04140f;
  font-weight: 600;
}

main {
  min-height: 60vh;
}

.hero {
  padding: 96px 0 72px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin: 0 0 16px;
  line-height: 1.3;
}

.hero p.lead {
  font-size: 1.1rem;
  color: var(--text-dim);
  max-width: 60ch;
  margin: 0;
}

section {
  padding: 64px 0;
  border-bottom: 1px solid var(--border);
}

section h2 {
  font-size: 1.5rem;
  margin: 0 0 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

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

.card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.92rem;
}

.contact-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.contact-box .email {
  font-size: 1.15rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--accent);
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #04140f;
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: opacity 0.15s ease;
}

.btn:hover {
  opacity: 0.85;
}

footer.site {
  padding: 32px 0 48px;
  color: var(--text-dim);
  font-size: 0.82rem;
}

footer.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

footer.site a {
  text-decoration: none;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
}

footer.site a:hover {
  color: var(--text);
}

footer.site a.legal-link {
  color: var(--accent);
  font-weight: 600;
  border-bottom: 1px solid var(--accent-dim);
}

footer.site a.legal-link:hover {
  color: var(--text);
  border-bottom-color: var(--text-dim);
}

/* language visibility */
[lang-ja], [lang-en] {
  display: none;
}

html[data-lang="ja"] [lang-ja] { display: revert; }
html[data-lang="en"] [lang-en] { display: revert; }

/* legal page */
.legal-header {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--border);
}

.legal-header h1 {
  font-size: 1.9rem;
  margin: 0 0 8px;
}

.legal-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 40px;
}

.legal-table th,
.legal-table td {
  text-align: left;
  padding: 18px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.legal-table th {
  width: 34%;
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.92rem;
}

.legal-table td {
  font-size: 0.95rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.88rem;
  margin-bottom: 24px;
}

.back-link:hover {
  color: var(--text);
}

/* mobile */
@media (max-width: 640px) {
  .wrap {
    padding: 0 16px;
  }

  header.site .wrap {
    height: auto;
    padding-top: 12px;
    padding-bottom: 12px;
    flex-wrap: wrap;
    row-gap: 10px;
  }

  .brand {
    flex-wrap: wrap;
    row-gap: 2px;
  }

  nav.site-nav {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }

  nav.site-nav a.navlink {
    white-space: nowrap;
  }

  .hero {
    padding: 56px 0 48px;
  }

  .hero h1 {
    line-height: 1.4;
  }

  .hero p.lead {
    font-size: 1rem;
  }

  section {
    padding: 44px 0;
  }

  .card {
    padding: 20px;
  }

  .contact-box {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
  }

  .contact-box .btn {
    width: 100%;
    text-align: center;
  }

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

  .legal-header {
    padding: 40px 0 24px;
  }

  .legal-header h1 {
    font-size: 1.4rem;
  }

  .legal-table th,
  .legal-table td {
    padding: 14px 8px 14px 0;
    font-size: 0.85rem;
    word-break: break-word;
  }

  .legal-table th {
    width: 30%;
    padding-right: 10px;
  }
}