:root {
  --blue: #7BA6DE;
  --blue-light: #F0F6FD;
  --blue-subtle: #E2EDF9;
  --blue-border: #BED8F6;
  --blue-medium: #5187CE;
  --blue-deep: #1A3E6D;
  --blue-glow: rgba(123, 166, 222, 0.28);
  --bg: #F8FAFD;
  --bg-surface: #FFF;
  --bg-subtle: #F1F6FC;
  --border: #E2E8F0;
  --text: #0F172A;
  --text-secondary: #475569;
  --text-inverse: #FFF;
  --sans: 'Geist', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'Geist Mono', 'SF Mono', monospace;
  --radius: 8px;
  --transition: 150ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font: 16px/1.6 var(--sans);
  color: var(--text);
  background: var(--bg);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background: radial-gradient(circle at 10% 20%, rgba(123, 166, 222, 0.06), transparent 40%), radial-gradient(circle at 90% 80%, rgba(123, 166, 222, 0.05), transparent 45%) fixed;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 24px;
  background: var(--blue-deep);
  color: var(--text-inverse);
  padding: 12px 20px;
  border-radius: 4px;
  font: 500 0.875rem var(--mono);
  text-decoration: none;
  z-index: 9999;
  box-shadow: 0 4px 12px var(--blue-glow);
  transition: top var(--transition);
}

.skip-link:focus {
  top: 20px;
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

a:focus-visible, button:focus-visible, [tabindex="0"]:focus-visible {
  outline: 2px solid var(--blue-medium);
  outline-offset: 3px;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}

.nav-container { display: flex; justify-content: center; }
.primary-nav ul { display: flex; list-style: none; gap: 24px; }
.primary-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font: 500 0.875rem var(--sans);
  padding: 6px 8px;
  border-radius: 4px;
  transition: color var(--transition), background var(--transition);
}
.primary-nav a:hover { color: var(--blue-deep); background: var(--blue-light); }

main { flex: 1; padding: 48px 0 80px; }
.section-block { margin-bottom: 64px; }
.section-block:first-child { margin-bottom: 120px; }
.section-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}
.section-tag {
  font: 600 0.75rem var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue-medium);
}

h1, h2, h3 { color: var(--text); font-weight: 600; }
h1 { font: 600 2.75rem/1.1 var(--sans); letter-spacing: -0.03em; margin-bottom: 12px; }
h2 { font: 600 2.125rem/1.2 var(--sans); letter-spacing: -0.025em; }
h3 { font: 600 1.125rem var(--sans); letter-spacing: -0.015em; margin-bottom: 12px; }

.hero-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--blue);
  border-radius: 12px;
  padding: 40px;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: center;
  box-shadow: 0 4px 20px rgba(123, 166, 222, 0.08);
}

.hero-text .greeting {
  font: 600 0.9375rem var(--sans);
  color: var(--blue-medium);
  display: block;
  margin-bottom: 8px;
}
.hero-subtitle { font-size: 1.125rem; color: var(--text-secondary); margin-bottom: 20px; max-width: 480px; }
.hero-summary { font-size: 0.9375rem; color: var(--text); line-height: 1.65; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blue-deep);
  color: var(--text-inverse);
  padding: 11px 20px;
  border-radius: 4px;
  font: 500 0.875rem var(--sans);
  text-decoration: none;
  border: 1px solid var(--blue-deep);
  transition: background var(--transition), transform var(--transition);
}
.btn-primary:hover { background: #244C7E; transform: scale(0.98); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  color: var(--blue-deep);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: 4px;
  font: 500 0.875rem var(--sans);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition);
}
.btn-secondary:hover { background: var(--blue-light); border-color: var(--blue-border); }

.hero-photo-wrapper { display: flex; align-items: center; }
.profile-figure { margin: 0; width: 100%; max-width: 280px; }
.profile-image-container {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  border: 2px solid var(--blue-border);
  background: var(--blue-light);
  box-shadow: 0 4px 16px var(--blue-glow);
}
.profile-img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 250ms cubic-bezier(0.16, 1, 0.3, 1); }
.profile-figure:hover .profile-img { transform: scale(1.02); }

.bento-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; }
.bento-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.bento-card:hover { border-color: var(--blue); box-shadow: 0 4px 14px var(--blue-glow); }
.bento-span-8 { grid-column: span 8; }
.bento-span-4 { grid-column: span 4; }
.bento-span-12 { grid-column: span 12; }

.biodata-list { display: grid; grid-template-columns: 140px 1fr; gap: 12px 16px; font-size: 0.9375rem; margin-top: 8px; }
.biodata-list dt { color: var(--text-secondary); font-size: 0.875rem; }
.biodata-list dd { font-weight: 500; }

.focus-intro { margin-bottom: 16px; }
.focus-list { list-style-position: inside; color: var(--text-secondary); font-size: 0.875rem; line-height: 1.8; }
.about-text { font-size: 0.9375rem; line-height: 1.7; }
.about-text + .about-text { margin-top: 1rem; }

.badge-group { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 9999px;
  font: 600 0.75rem var(--mono);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.badge-blue { background: var(--blue-light); color: var(--blue-deep); border: 1px solid var(--blue-border); }

kbd {
  display: inline-block;
  padding: 2px 7px;
  font: 0.75rem var(--mono);
  color: var(--blue-deep);
  background: var(--blue-light);
  border: 1px solid var(--blue-border);
  border-radius: 4px;
}

.table-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(123, 166, 222, 0.05);
}
.table-responsive { width: 100%; overflow-x: auto; }
.course-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }

.course-table thead th {
  background: var(--bg-subtle);
  color: var(--blue-deep);
  font: 600 0.8125rem var(--sans);
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.course-table thead th:first-child { width: 48px; }
.course-table thead th:nth-child(3) { width: 70px; }
.course-table thead th:last-child { width: 100px; }

.course-table tbody tr { border-bottom: 1px solid var(--border); transition: background var(--transition); }
.course-table tbody tr:hover { background: var(--blue-light); }
.course-table tbody td { padding: 16px 20px; vertical-align: middle; }
.course-table tbody td:first-child { text-align: center; color: var(--text-secondary); font-family: var(--mono); }
.course-table tbody td:nth-child(4), 
.course-table tbody td:last-child { text-align: center; }

.course-name { font-weight: 500; }
.course-meta-detail { display: block; font-size: 0.75rem; color: var(--text-secondary); margin-top: 2px; }
.course-sks { font: 600 var(--mono); color: var(--blue-deep); }

.links-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.link-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  color: var(--text);
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.link-card:hover { border-color: var(--blue); background: var(--blue-light); box-shadow: 0 4px 12px var(--blue-glow); }
.link-title { font-weight: 600; font-size: 0.9375rem; color: var(--blue-deep); display: block; }
.link-desc { font-size: 0.8125rem; color: var(--text-secondary); margin-top: 4px; display: block; }
.external-icon { width: 18px; height: 18px; stroke: var(--blue-medium); stroke-width: 2; transition: transform var(--transition), stroke var(--transition); }
.link-card:hover .external-icon { stroke: var(--blue-deep); transform: translate(2px, -2px); }

.site-footer { border-top: 1px solid var(--border); background: var(--bg-surface); padding: 24px 0; font-size: 0.75rem; color: var(--text-secondary); }
.footer-content { text-align: center; }
.footer-content address { font-style: normal; line-height: 1.5; }

.animate-fade-in { opacity: 0; transform: translateY(12px); transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1), transform 600ms cubic-bezier(0.16, 1, 0.3, 1); }
.animate-fade-in.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.75rem; }
  .hero-card { grid-template-columns: 1fr; padding: 24px; gap: 32px; }
  .bento-span-8, .bento-span-4 { grid-column: span 12; }
  .biodata-list { grid-template-columns: 120px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .animate-fade-in { opacity: 1; transform: none; transition: none; }
}