:root {
  --bg: #ffffff;
  --panel: #f7f8f9;
  --text: #22272e;
  --muted: #66717d;
  --line: #dfe4e8;
  --accent: #2f6073;
  --accent-dark: #244b59;
  --max-content: 860px;
  --sidebar-width: 285px;
  --radius: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  font-size: 17px;
}

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus { color: var(--accent-dark); text-decoration: underline; }
img { max-width: 100%; height: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  min-height: 64px;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  font-weight: 650;
  color: var(--text);
  letter-spacing: .01em;
}
.main-nav { display: flex; flex-wrap: wrap; gap: 22px; align-items: center; }
.main-nav a {
  color: #3f4851;
  font-size: .93rem;
  font-weight: 520;
}
.main-nav a[aria-current="page"] { color: var(--accent); }
.nav-toggle { display: none; border: 0; background: transparent; font-size: 1.5rem; cursor: pointer; }

.layout {
  max-width: 1240px;
  margin: 0 auto;
  padding: 48px 28px 70px;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, var(--max-content));
  gap: 64px;
  align-items: start;
}
.sidebar {
  position: sticky;
  top: 104px;
  align-self: start;
}
.profile-photo {
  width: 190px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 50%;
  display: block;
  margin-bottom: 22px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.sidebar h1 { margin: 0 0 6px; font-size: 1.58rem; line-height: 1.2; }
.sidebar .title { margin: 0 0 16px; color: var(--muted); font-size: .98rem; line-height: 1.45; }
.sidebar-links { list-style: none; padding: 0; margin: 18px 0 0; }
.sidebar-links li { margin: 8px 0; font-size: .94rem; }
.sidebar-note { margin-top: 20px; color: var(--muted); font-size: .86rem; }

.content { min-width: 0; }
.content h1 { font-size: 2.18rem; margin: 0 0 22px; line-height: 1.18; letter-spacing: -.015em; }
.content h2 { font-size: 1.42rem; margin: 48px 0 14px; line-height: 1.3; }
.content h3 { font-size: 1.08rem; margin: 28px 0 8px; }
.content p { margin: 0 0 18px; }
.lede { font-size: 1.12rem; color: #303842; }
.eyebrow { color: var(--accent); font-size: .83rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 10px; }

.section-rule { border: 0; border-top: 1px solid var(--line); margin: 42px 0; }

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin: 24px 0;
}
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  background: #fff;
}
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.card-link { font-weight: 600; }

.feature {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 26px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}
.feature:first-of-type { border-top: 0; }
.feature img {
  width: 180px;
  height: 120px;
  object-fit: cover;
  border-radius: 5px;
  background: var(--panel);
}
.feature h3 { margin: 0 0 8px; }
.feature p { margin-bottom: 10px; }

.person-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}
.person {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.person h3 { margin: 0 0 4px; }
.person .role { color: var(--muted); font-size: .94rem; margin-bottom: 8px; }

.pub-list { padding-left: 1.3rem; }
.pub-list li { margin-bottom: 16px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.tag { background: var(--panel); border: 1px solid var(--line); padding: 3px 9px; border-radius: 999px; font-size: .78rem; color: #4e5964; }

.notice {
  border-left: 4px solid var(--accent);
  background: var(--panel);
  padding: 18px 20px;
  margin: 24px 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .86rem;
}
.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 28px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 10px 15px;
  border-radius: 5px;
  font-size: .9rem;
  font-weight: 600;
}
.button:hover { background: var(--accent-dark); color: #fff; text-decoration: none; }
.button.secondary { background: #fff; color: var(--accent); border: 1px solid var(--accent); }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; gap: 34px; padding-top: 34px; }
  .sidebar { position: static; display: grid; grid-template-columns: 130px 1fr; gap: 22px; align-items: center; }
  .profile-photo { width: 130px; margin: 0; }
  .sidebar-links { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 12px; }
  .sidebar-links li { margin: 0; }
  .sidebar-note { display: none; }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .header-inner { padding: 0 18px; min-height: 58px; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 58px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 16px 18px 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .main-nav.open { display: flex; }
  .layout { padding: 28px 18px 54px; }
  .sidebar { grid-template-columns: 92px 1fr; gap: 16px; }
  .profile-photo { width: 92px; }
  .sidebar h1 { font-size: 1.32rem; }
  .sidebar .title { font-size: .88rem; margin-bottom: 8px; }
  .sidebar-links { grid-column: 1 / -1; }
  .content h1 { font-size: 1.82rem; }
  .cards, .person-grid { grid-template-columns: 1fr; }
  .feature { grid-template-columns: 1fr; }
  .feature img { width: 100%; height: 180px; }
}