:root {
  --bg-deep: #0a102e;
  --bg-mid: #101832;
  --bg-card: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.16);
  --text: #e0e8ff;
  --text-muted: rgba(224, 232, 255, 0.72);
  --aqua: #59d9f2;
  --aqua-soft: #8ce8fa;
  --purple: #b89eeb;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", sans-serif;
  line-height: 1.75;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(89, 217, 242, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(184, 158, 235, 0.1), transparent),
    linear-gradient(160deg, var(--bg-deep) 0%, var(--bg-mid) 45%, #0c1430 100%);
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.site-header {
  text-align: center;
  margin-bottom: 2rem;
}

.site-logo {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text);
  margin: 0 0 0.35rem;
}

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

.site-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.site-nav a {
  padding: 0.45rem 1rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-muted);
  border: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.site-nav a:hover {
  color: var(--aqua-soft);
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.04);
}

.site-nav a.active {
  color: var(--bg-deep);
  background: linear-gradient(135deg, var(--aqua) 0%, var(--aqua-soft) 100%);
  border-color: transparent;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.card h2 {
  margin: 1.75rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--aqua-soft);
}

.card h2:first-of-type {
  margin-top: 1.25rem;
}

.card p,
.card li {
  color: var(--text-muted);
  margin: 0.5rem 0;
}

.card ul {
  padding-left: 1.25rem;
}

.card a {
  color: var(--aqua);
  text-decoration: none;
}

.card a:hover {
  color: var(--aqua-soft);
  text-decoration: underline;
}

.meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.btn-primary,
.card a.btn-primary,
.card a.btn-primary:link,
.card a.btn-primary:visited {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  color: #ffffff !important;
  -webkit-text-fill-color: #ffffff;
  background: linear-gradient(135deg, #0d5f78 0%, #1488a8 55%, #1fa3c4 100%);
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn-primary:hover,
.card a.btn-primary:hover,
.card a.btn-primary:active {
  color: #ffffff !important;
  -webkit-text-fill-color: #ffffff;
  transform: translateY(-1px);
  background: linear-gradient(135deg, #106a84 0%, #1896b8 55%, #28b0d4 100%);
  box-shadow: 0 12px 28px rgba(89, 217, 242, 0.3);
  text-decoration: none;
}

.link-grid {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.link-card {
  display: block;
  padding: 1rem 1.25rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}

.link-card:hover {
  border-color: rgba(89, 217, 242, 0.4);
  background: rgba(89, 217, 242, 0.08);
  text-decoration: none;
}

.link-card strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.link-card span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.site-footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--aqua);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .page {
    padding: 1.5rem 1rem 2.5rem;
  }

  .card {
    padding: 1.25rem 1rem;
  }

  .site-logo {
    font-size: 1.5rem;
  }
}