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

/* === Base === */
html { scroll-behavior: smooth; scroll-padding-top: 64px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background: #fff;
}

a { color: #333; text-decoration: none; }
a:hover { color: #0066cc; }

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

/* === Layout === */
.container { max-width: 800px; margin: 0 auto; padding: 0 24px; }

.section {
  padding: 64px 0;
  border-bottom: 1px solid #eee;
}
.section:last-child { border-bottom: none; }

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: #111;
}

/* === Nav === */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #eee;
  z-index: 100;
  padding: 0 24px;
}

.nav-inner {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 56px;
  gap: 24px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  margin-right: auto;
}

.nav-link {
  font-size: 0.875rem;
  color: #666;
  transition: color 0.2s;
}
.nav-link:hover, .nav-link.active { color: #111; }

.nav-external::after { content: " ↗"; font-size: 0.75rem; }

/* === Hero === */
.hero {
  padding: 80px 0 64px;
  text-align: center;
}

.hero-name { font-size: 2rem; font-weight: 700; color: #111; }
.hero-role { font-size: 1.1rem; color: #666; margin-top: 8px; }

.hero-tags {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
  flex-wrap: wrap;
}

.tag {
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.85rem;
  background: #f0f0f0;
  color: #555;
}

.hero-links {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

.btn {
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 0.875rem;
  border: 1px solid #ddd;
  background: #fff;
  color: #333;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  text-decoration: none;
  display: inline-block;
}
.btn:hover { background: #f5f5f5; border-color: #bbb; }
.btn-primary { background: #111; color: #fff; border-color: #111; }
.btn-primary:hover { background: #333; }

/* === Project Card === */
.project-list { display: flex; flex-direction: column; gap: 16px; }

.project-card {
  padding: 20px;
  border: 1px solid #eee;
  border-radius: 8px;
  transition: border-color 0.2s;
}
.project-card:hover { border-color: #ccc; }

.project-card-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}
.project-card-name { font-weight: 600; font-size: 1.05rem; }
.project-card-category {
  font-size: 0.75rem;
  color: #999;
}
.project-card-desc { color: #666; font-size: 0.925rem; margin-bottom: 12px; }

.project-card-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.project-card-tag {
  padding: 2px 8px;
  background: #f5f5f5;
  border-radius: 3px;
  font-size: 0.8rem;
  color: #666;
}

.project-card-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.85rem;
  color: #0066cc;
}
.project-card-link:hover { text-decoration: underline; }

/* === Skills === */
.skills-group { margin-bottom: 20px; }
.skills-group:last-child { margin-bottom: 0; }
.skills-group-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #999;
  margin-bottom: 8px;
}
.skills-tags { display: flex; gap: 8px; flex-wrap: wrap; }

/* === Sitemap Cards === */
.sitemap-header {
  text-align: center;
  padding: 48px 0 32px;
}
.sitemap-title { font-size: 1.5rem; font-weight: 700; }
.sitemap-subtitle { color: #999; margin-top: 4px; }

.sitemap-section-title {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #999;
  font-weight: 600;
  margin-bottom: 16px;
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 40px;
}

.site-card {
  border: 1px solid #eee;
  padding: 24px;
  border-radius: 10px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  display: block;
}
.site-card:hover {
  border-color: #ccc;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.site-card-icon { font-size: 1.5rem; margin-bottom: 8px; }
.site-card-name { font-weight: 600; font-size: 0.95rem; }
.site-card-desc { color: #999; font-size: 0.8rem; margin-top: 4px; }
.site-card-sublink {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.75rem;
  color: #0066cc;
}

/* Wrapper to keep card + sublink in one grid cell */
.site-card-wrapper { display: flex; flex-direction: column; }

.infra-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

.infra-card {
  border: 1px solid #eee;
  padding: 16px;
  border-radius: 8px;
  text-align: center;
  text-decoration: none;
  color: #666;
  background: #fafafa;
  transition: border-color 0.2s;
  display: block;
}
.infra-card:hover { border-color: #ccc; }
.infra-card-icon { font-size: 1.2rem; }
.infra-card-name { font-size: 0.85rem; margin-top: 4px; }
.infra-card-desc { font-size: 0.7rem; color: #aaa; margin-top: 2px; }

/* === Footer === */
.footer {
  padding: 32px 0;
  text-align: center;
  color: #999;
  font-size: 0.85rem;
}
.footer a { color: #666; }
.footer a:hover { color: #333; }

/* === Responsive === */
@media (max-width: 640px) {
  .nav-inner { gap: 16px; }
  .nav-link { font-size: 0.8rem; }
  .hero { padding: 48px 0 40px; }
  .hero-name { font-size: 1.5rem; }
  .section { padding: 40px 0; }
  .card-grid { grid-template-columns: 1fr; }
  .infra-grid { grid-template-columns: 1fr 1fr; }
}