/* Okazawa Lab — GitHub Pages stylesheet */

:root {
  --accent: #2a5298;
  --accent-light: #4a72c4;
  --text: #1a1a1a;
  --muted: #555;
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --border: #dde2ea;
  --max-width: 860px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

/* ── Nav ── */
nav {
  background: var(--accent);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

nav .nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 1.5rem;
}

nav .site-title {
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  padding: 1rem 0;
  margin-right: auto;
  white-space: nowrap;
}

nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 1rem 0.75rem;
  display: inline-block;
  transition: color 0.15s;
}

nav a:hover, nav a.active { color: #fff; }

nav a.active {
  border-bottom: 2px solid rgba(255,255,255,0.8);
}

/* ── Page wrapper ── */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

/* ── Typography ── */
h1 { font-size: 2rem; margin-bottom: 0.25rem; color: var(--accent); }
h2 { font-size: 1.3rem; margin-top: 2.5rem; margin-bottom: 0.6rem; color: var(--accent); border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
h3 { font-size: 1.05rem; margin-top: 1.5rem; margin-bottom: 0.3rem; }
h4 { font-size: 0.95rem; margin-top: 1rem; color: var(--muted); }

p { margin-bottom: 0.9rem; }
a { color: var(--accent); }
a:hover { color: var(--accent-light); }

/* ── Home hero ── */
.home-hero {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.home-hero img {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid var(--border);
}

.home-hero .bio h1 { margin-bottom: 0.15rem; }
.home-hero .bio .position { color: var(--muted); font-size: 0.95rem; margin-bottom: 0.8rem; }

/* ── Research themes ── */
.research-theme {
  background: var(--bg-alt);
  border-left: 4px solid var(--accent);
  padding: 1.2rem 1.4rem;
  margin: 1.5rem 0;
  border-radius: 0 6px 6px 0;
}
.research-theme h3 { margin-top: 0; color: var(--accent); }

/* ── Questions list ── */
.questions-list {
  list-style: none;
  padding: 0;
}
.questions-list li {
  padding: 0.7rem 0 0.7rem 1.2rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.questions-list li:last-child { border-bottom: none; }
.questions-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ── Publications ── */
.pub-section { margin-bottom: 0.5rem; }

.pub-entry {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.pub-entry:last-child { border-bottom: none; }

.pub-num { color: var(--muted); font-size: 0.85rem; min-width: 2rem; display: inline-block; }
.pub-title { font-weight: 600; }
.pub-authors { color: var(--muted); font-size: 0.92rem; }
.pub-journal { font-style: italic; color: var(--muted); font-size: 0.92rem; }
.pub-links a {
  font-size: 0.8rem;
  padding: 2px 8px;
  border: 1px solid var(--accent);
  border-radius: 3px;
  margin-right: 4px;
  text-decoration: none;
}

.pub-featured {
  background: var(--bg-alt);
  border-left: 4px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
}
.pub-featured .pub-title { font-size: 1rem; }
.pub-featured .pub-summary { font-size: 0.92rem; margin-top: 0.4rem; margin-bottom: 0.4rem; }

/* ── CV timeline ── */
.cv-entry { padding: 1rem 0; border-bottom: 1px solid var(--border); display: flex; gap: 1.5rem; }
.cv-entry:last-child { border-bottom: none; }
.cv-year { color: var(--muted); font-size: 0.88rem; min-width: 7rem; flex-shrink: 0; padding-top: 0.1rem; }
.cv-content h3 { margin-top: 0; font-size: 1rem; }
.cv-content p { margin: 0.15rem 0; font-size: 0.93rem; color: var(--muted); }

/* ── Resources ── */
.resource-card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  margin: 1rem 0;
}
.resource-card h3 { margin-top: 0; font-size: 1rem; }
.resource-card .resource-url { font-size: 0.82rem; color: var(--muted); margin-bottom: 0.4rem; word-break: break-all; }

/* ── Contact ── */
.contact-info { font-size: 0.95rem; line-height: 2; }

/* ── Footer ── */
footer {
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
  padding: 2rem 1rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

/* ── Keywords tag ── */
.keywords {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.5rem 0 1.5rem;
}
.keywords span {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2px 10px;
  margin: 2px;
  display: inline-block;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .home-hero { flex-direction: column; }
  .home-hero img { width: 100px; height: 100px; }
  nav .site-title { font-size: 0.85rem; }
  nav a { padding: 1rem 0.5rem; font-size: 0.78rem; }
}