:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --border: #dbe3ef;
  --shadow: 0 10px 30px rgba(31, 41, 55, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: linear-gradient(180deg, #eef4ff 0%, var(--bg) 220px);
}

.container {
  width: min(920px, 92%);
  margin: 0 auto;
}

.site-header {
  padding: 64px 0 28px;
}

.profile-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 24px;
}

.profile-photo-area {
  margin-left: auto;
  margin-right: 20%;
  width: clamp(130px, 18vw, 180px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 2px dashed var(--border);
  background: #eef2f8;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}

.profile-header > div:not(.profile-photo-area) {
  max-width: 680px;
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.site-title {
  margin: 0;
  font-size: clamp(1.8rem, 4.8vw, 2.6rem);
}

.site-subtitle {
  margin-top: 10px;
  color: var(--muted);
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
  background: rgba(244, 247, 251, 0.75);
  border-bottom: 1px solid var(--border);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--primary);
  padding: 8px 12px;
  border: 1px solid rgba(37, 99, 235, 0.3);
  border-radius: 999px;
  font-size: 0.95rem;
}

main {
  padding: 26px 0 60px;
  display: grid;
  gap: 18px;
}

.section-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.section-card h2 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.25rem;
}

.placeholder {
  margin: 0;
  color: var(--muted);
}

.placeholder-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.research-name {
  margin: 0;
  color: var(--text);
  font-size: 1.1rem;
}

.research-summary {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}

.research-description {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0 30px;
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 640px) {
  .profile-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .profile-photo-area {
    justify-self: start;
    width: 108px;
    margin-left: 0;
    margin-right: 0;
  }
}