:root {
  --background: #F4EEE4;
  --surface: #FFFBF6;
  --surface-raised: #F8F1E6;
  --warm-white: #EEE4D6;
  --text-primary: #2F2925;
  --text-secondary: #6C645C;
  --text-tertiary: #A0978D;
  --accent: #476B77;
  --accent-dark: #31505B;
  --accent-tint: #E7EFF1;
  --terracotta: #A86D4E;
  --terracotta-tint: #F6EBE3;
  --border: rgba(61, 49, 38, 0.12);
  --shadow: rgba(40, 31, 24, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo",
    sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "palt";
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.15s ease;
}

a:hover {
  opacity: 0.7;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === Header === */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
  background: rgba(255, 251, 246, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.nav {
  display: flex;
  gap: 24px;
}

.nav a {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

.nav a:hover {
  color: var(--text-primary);
  opacity: 1;
}

/* === Hero === */
.hero {
  padding: 96px 0 64px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero .tagline {
  font-size: clamp(15px, 2vw, 17px);
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

/* === Section === */
.section {
  padding: 64px 0;
}

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

.section h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}

.section h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--text-primary);
}

.section p {
  font-size: 15px;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section ul {
  margin: 12px 0 16px 24px;
}

.section li {
  font-size: 15px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

/* === Card === */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 16px;
  box-shadow: 0 1px 2px var(--shadow);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 8px;
}

.card .meta {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.card .description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.card .badge {
  display: inline-block;
  padding: 3px 10px;
  background: var(--accent-tint);
  color: var(--accent-dark);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  margin-right: 6px;
}

/* === Definition list (privacy/terms) === */
.dl-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 16px;
}

.dl-block dt {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.dl-block dd {
  font-size: 15px;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.dl-block dd:last-child {
  margin-bottom: 0;
}

/* === Contact button === */
.button {
  display: inline-block;
  background: var(--accent);
  color: var(--surface);
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  border: none;
  transition: opacity 0.15s ease, transform 0.1s ease;
  cursor: pointer;
}

.button:hover {
  opacity: 0.9;
  color: var(--surface);
}

.button:active {
  transform: scale(0.98);
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 64px;
  margin-top: 64px;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer .copyright {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* === Last updated === */
.last-updated {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 32px;
  padding: 12px 16px;
  background: var(--surface-raised);
  border-radius: 8px;
  display: inline-block;
}

/* === Mobile === */
@media (max-width: 600px) {
  .container {
    padding: 0 20px;
  }
  .hero {
    padding: 64px 0 48px;
  }
  .section {
    padding: 48px 0;
  }
  .nav {
    gap: 16px;
  }
  .nav a {
    font-size: 13px;
  }
}