:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;

  --accent: #1d4ed8;       /* メイン青 */
  --accent-soft: #eff6ff;  /* 薄い青背景 */

  --maxw: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(var(--maxw), calc(100% - 32px));
  margin: 0 auto;
}

.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(--line);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-subtitle {
  font-size: 0.9rem;
  color: var(--muted);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.95rem;
}

.nav a {
  color: var(--muted);
}

.nav a:hover,
.nav a:focus {
  color: var(--accent);
}

.hero {
  padding: 56px 0 32px;
}

.hero-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
}

.profile-photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 18px;
  overflow: hidden;
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
}

.profile-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: none;
  box-shadow: none;
  display: block;
}

.hero-text h1 {
  margin: 0 0 8px;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.15;
}

.hero-text .jp-name {
  margin: 0 0 12px;
  font-size: 1rem;
  color: var(--muted);
}

.hero-text .role {
  margin: 0 0 18px;
  font-size: 1rem;
}

.hero-text .intro {
  margin: 0 0 20px;
  color: #374151;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.95rem;
  transition: 0.2s ease;
}

.button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.button.primary:hover {
  filter: brightness(0.95);
}

.main-grid {
  display: block;
  padding-bottom: 60px;
}

.section-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 26px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
  margin-bottom: 24px;
}

.section-title {
  margin: 0 0 18px;
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: none;
}

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news-list li {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  margin-bottom: 18px;
  align-items: start;
}

.news-date {
  color: var(--text);
  white-space: nowrap;
}

.news-content {
  min-width: 0;
}

.news-list a {
  color: #0969da;
  font-weight: 600;
  text-decoration: none;
}

.news-list a:hover {
  text-decoration: underline;
}

.news-authors {
  font-size: 0.92rem;
  color: var(--muted);
}

@media (max-width: 640px) {
  .news-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .news-date {
    margin-bottom: 2px;
  }
}

.conf-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.conf-link:hover {
  text-decoration: underline;
}

.hero-description {
  padding: 0;
  padding-top: 10px;
  font-size: 12.5pt;
  line-height: 1.45;
}

.accent-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.accent-link:hover {
  text-decoration: underline;
}

.meta-item {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.meta-label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);        /* ← ここを戻す */
  font-size: 0.88rem;
  border: 1px solid var(--accent-dark);  /* 濃い青に変更 */
}

.footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 24px 0 40px;
  font-size: 0.92rem;
}

@media (max-width: 900px) {
  .hero-card {
    grid-template-columns: 1fr;
  }

  .profile-photo {
    max-width: 220px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    align-items: flex-start;
    padding: 14px 0;
    flex-direction: column;
  }

  .hero {
    padding-top: 28px;
  }

  .hero-card,
  .section-card {
    padding: 20px;
  }
}