:root {
  --bg: #f7f7f8;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #56627a;
  --border: #e5e7eb;
  --primary: #6d28d9;
  --accent: #0891b2;
  --link: #1d4ed8;
  --radius: 16px;
  --shadow: 0 8px 30px rgba(2,6,23,0.06);
}
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(80% 60% at 50% 0%, rgba(109,40,217,0.08), transparent 60%),
    radial-gradient(50% 40% at 80% 10%, rgba(8,145,178,0.06), transparent 60%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.container { width: min(1100px, 92%); margin-inline: auto; }
.section { padding: 72px 0; }
.muted { color: var(--muted); }
.card {
  background: linear-gradient(180deg, rgba(2,6,23,0.02), rgba(2,6,23,0.01));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(10px);
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border);
}
nav { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .2px; }
.brand-mark { width: 22px; height: 22px; border-radius: 6px; background: linear-gradient(135deg, var(--primary), var(--accent)); box-shadow: 0 6px 20px rgba(8,145,178,.25); }
.nav-links { display: flex; gap: 20px; font-size: 14px; }
.nav-links a { color: var(--text); text-decoration: none; opacity: .86; }
.nav-links a:hover { opacity: 1; }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.btn { display: inline-flex; align-items: center; gap: .5rem; border-radius: 999px; border: 1px solid var(--border); padding: 10px 14px; text-decoration: none; color: var(--text); background: var(--panel); }
.btn.primary { background: linear-gradient(135deg, var(--primary), var(--accent)); border: none; color: white; }
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.menu-toggle .hamburger { position: relative; width: 20px; height: 2px; background: currentColor; }
.menu-toggle .hamburger span { position: absolute; left: 0; width: 20px; height: 2px; background: currentColor; transition: transform .2s ease, opacity .2s ease, top .2s ease; }
.menu-toggle .hamburger span:nth-child(1) { top: -6px; }
.menu-toggle .hamburger span:nth-child(2) { top: 0; }
.menu-toggle .hamburger span:nth-child(3) { top: 6px; }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.menu-toggle .hamburger { position: relative; width: 20px; height: 2px; background: currentColor; }
.menu-toggle .hamburger span { position: absolute; left: 0; width: 20px; height: 2px; background: currentColor; transition: transform .2s ease, opacity .2s ease, top .2s ease; }
.menu-toggle .hamburger span:nth-child(1) { top: -6px; }
.menu-toggle .hamburger span:nth-child(2) { top: 0; }
.menu-toggle .hamburger span:nth-child(3) { top: 6px; }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .mobile-menu { display: none !important; }
  .mobile-menu.open { display: grid; gap: 10px; padding: 10px 0 16px; }
  .mobile-menu a { padding: 10px 12px; border-radius: 10px; text-decoration: none; color: var(--text); background: rgba(2,6,23,.02); border: 1px solid var(--border); }
}
.hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 28px; align-items: center; }
.hero h1 { font-size: clamp(30px, 4vw, 56px); line-height: 1.08; margin: 0; }
.hero p { margin: 16px 0 24px; color: var(--muted); max-width: 56ch; }
.mock { aspect-ratio: 16/10; border-radius: calc(var(--radius) + 6px); position: relative; overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow);
  background: linear-gradient(180deg, rgba(2,6,23,.03), rgba(2,6,23,.01)); }
.mock::before { content:""; position:absolute; inset:0; background:
  radial-gradient(60% 40% at 50% 20%, rgba(2,6,23,.06), transparent 50%),
  conic-gradient(from 120deg, color-mix(in oklab, var(--primary), white 8%) 0 25%, color-mix(in oklab, var(--accent), white 12%) 0 45%, transparent 0 100%);
  opacity:.7; mix-blend-mode: normal; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.grid-3, .grid-2{ grid-template-columns: 1fr; } }
.section h2 { font-size: clamp(22px, 2.4vw, 36px); margin: 0 0 8px; }
.section .lead { color: var(--muted); margin-top: 4px; }
.news-list { display:grid; gap:12px; }
.news-item { display:flex; gap:14px; align-items: baseline; padding: 12px; border:1px solid var(--border); border-radius: 12px; background: rgba(2,6,23,.02); }
.news-date { font-variant-numeric: tabular-nums; font-size: 13px; color: var(--muted); width: 8ch; }
.pub-list { display:grid; gap:12px; }
.pub-item { padding: 12px; border:1px solid var(--border); border-radius: 12px; background: rgba(2,6,23,.02); }
.pub-title { font-weight: 600; }
.pub-meta { font-size: 14px; color: var(--muted); }
.member-grid { display:grid; grid-template-columns: repeat(4, 1fr); gap:16px; }
.member { padding: 14px; border:1px solid var(--border); border-radius: 12px; background: rgba(2,6,23,.02); }
.role { font-size: 12px; letter-spacing: .2px; color: var(--muted); }
}
.access { display:grid; grid-template-columns: 1.1fr 1fr; gap: 18px; }
.map { aspect-ratio: 16/10; border:1px solid var(--border); border-radius: 12px; background: rgba(2,6,23,.02); display:grid; place-items:center; }
}
footer { border-top:1px solid var(--border); background: var(--panel); }
.footer { display:flex; align-items:center; justify-content:space-between; gap:14px; padding: 24px 0; font-size: 14px; color: var(--muted); }
.skip { position:absolute; left:-9999px; }
.skip:focus { left: 10px; top: 10px; background: var(--panel); color: var(--text); padding: 8px 10px; border-radius: 8px; border:1px solid var(--border); z-index:100; }
#toTop { position: fixed; right: 16px; bottom: 16px; opacity: 0; transform: translateY(8px); transition: .2s; }
#toTop.show { opacity: 1; transform: translateY(0); }
.nav-links a.nav-links a.active { font-weight: 600; text-decoration: none !important; }


.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.menu-toggle .hamburger { position: relative; width: 20px; height: 2px; background: currentColor; }
.menu-toggle .hamburger span { position: absolute; left: 0; width: 20px; height: 2px; background: currentColor; transition: transform .2s ease, opacity .2s ease, top .2s ease; }
.menu-toggle .hamburger span:nth-child(1) { top: -6px; }
.menu-toggle .hamburger span:nth-child(2) { top: 0; }
.menu-toggle .hamburger span:nth-child(3) { top: 6px; }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .mobile-menu { display: none !important; }
  .mobile-menu.open { display: grid !important; gap: 10px; padding: 10px 0 16px; }
  .mobile-menu a { padding: 10px 12px; border-radius: 10px; text-decoration: none; color: var(--text); background: rgba(2,6,23,.02); border: 1px solid var(--border); }
}



/* Strong link reset for header/menus/buttons */
header a, .nav-links a, .mobile-menu a, .btn { text-decoration: none !important; border-bottom: none !important; }
a:focus { outline: 2px solid color-mix(in oklab, var(--link), white 30%); outline-offset: 3px; text-decoration: none !important; }


@media (max-width: 880px) {
  .nav-links { display: none; }
  .menu-toggle { display: inline-flex; }
  .mobile-menu { display: none !important; }
  .mobile-menu.open { display: grid !important; gap: 10px; padding: 10px 0 16px; }
  .mobile-menu a { padding: 10px 12px; border-radius: 10px; text-decoration: none; color: var(--text); background: rgba(2,6,23,.02); border: 1px solid var(--border); }
}