:root {
  --primary: #c53030;
  --primary-hover: #9b2c2c;
  --primary-light: #fff5f5;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border: #e2e8f0;
  --border-focus: #cbd5e1;
  --tag-bg: #f1f5f9;
  --tag-text: #334155;
  --badge-bg: #e6fffa;
  --badge-text: #234e52;
  --badge-border: #b2f5ea;
  --max-w: 920px;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #e53e3e;
    --primary-hover: #fc8181;
    --primary-light: #2d1818;
    --bg: #0b0f19;
    --card-bg: #131b2e;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #1e293b;
    --border-focus: #334155;
    --tag-bg: #1e293b;
    --tag-text: #cbd5e1;
    --badge-bg: #0d2826;
    --badge-text: #81e6d9;
    --badge-border: #1d403d;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Hiragino Sans", "BIZ UDPGothic", Meiryo, sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Header */
.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
}

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

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  font-size: 0.925rem;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  text-decoration: none;
}

/* Main Layout */
.main-content {
  flex: 1;
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 3rem 1rem 3.5rem;
}

.hero-icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

.hero h1 {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 1.5rem;
}

.badge-group {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.825rem;
  font-weight: 600;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

.badge.neutral {
  background-color: var(--tag-bg);
  color: var(--tag-text);
  border-color: var(--border);
}

.cta-group {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #ffffff;
  text-decoration: none;
}

.btn-outline {
  background-color: var(--card-bg);
  color: var(--text-main);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--border-focus);
  background-color: var(--tag-bg);
  text-decoration: none;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.card-text {
  font-size: 0.925rem;
  color: var(--text-muted);
}

/* Policy Document */
.policy-container {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow);
}

.policy-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.policy-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.lang-switch {
  display: flex;
  background: var(--tag-bg);
  border-radius: 8px;
  padding: 3px;
  border: 1px solid var(--border);
}

.lang-btn {
  padding: 0.35rem 0.85rem;
  font-size: 0.825rem;
  font-weight: 600;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.lang-btn.active {
  background: var(--card-bg);
  color: var(--text-main);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.policy-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.policy-section {
  margin-bottom: 2rem;
}

.policy-section:last-child {
  margin-bottom: 0;
}

.policy-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.policy-section p {
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.policy-section ul {
  padding-left: 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.policy-section li {
  margin-bottom: 0.4rem;
}

.policy-callout {
  background-color: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 8px 8px 0;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}

.policy-callout p {
  color: var(--text-main);
  margin: 0;
  font-weight: 500;
}

/* Footer */
.site-footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  margin-top: auto;
  padding: 2rem 1.5rem;
}

.footer-container {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}

/* Responsive */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.7rem;
  }
  .policy-container {
    padding: 1.5rem;
  }
  .footer-container {
    flex-direction: column;
    text-align: center;
  }
}