:root {
  --text: #1f2937;
  --muted: #6b7280;
  --navy: #17324d;
  --dark-navy: #20384d;
  --blue: #2d5f8b;
  --teal: #2f6f73;
  --line: #c7d4dc;
  --soft-line: #d6e7ea;
  --nav-text: #dce7ef;
  --page-bg: #fbfaf6;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--white) linear-gradient(var(--page-bg), var(--white) 220px) no-repeat;
  line-height: 1.7;
}

/* ---------- ヘッダー ---------- */

.site-header {
  background: var(--navy);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.header-inner,
main {
  max-width: 1040px;
  margin: 0 auto;
  padding: 16px 28px;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.site-name {
  color: var(--white);
  font-size: 1.4rem;
  font-weight: 700;
  text-decoration: none;
}

.language-switch {
  display: flex;
  gap: 8px;
  font-size: 0.86rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-top: 13px;
  font-size: 0.95rem;
}

.language-switch a,
.site-nav a {
  color: var(--nav-text);
  text-decoration: none;
}

.site-nav a {
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.language-switch .current,
.site-nav a:hover,
.site-nav a.active {
  color: var(--white);
}

.language-switch .current {
  font-weight: 700;
}

.language-switch .separator {
  color: #7890a2;
}

.site-nav a.active {
  border-bottom-color: #68b0ab;
}

/* ---------- 本文共通 ---------- */

main {
  padding-top: 58px;
  padding-bottom: 90px;
}

h1,
h2 {
  color: var(--navy);
}

h1 {
  margin: 0 0 8px;
  font-size: 2.25rem;
  line-height: 1.2;
}

h2 {
  margin: 0 0 24px;
  padding-bottom: 10px;
  font-size: 1.6rem;
  border-bottom: 2px solid var(--soft-line);
}

h3 {
  margin: 30px 0 13px;
  color: var(--teal);
  font-size: 1.05rem;
}

.affiliation {
  color: #7d8790;
}

/* ---------- ホーム ---------- */

.intro-card {
  margin-top: 20px;
  background: rgba(255, 255, 255, 0.92);
  border: 1.5px solid #bccbd4;
  border-radius: 14px;
  padding: 24px 26px;
  box-shadow: 0 6px 22px rgba(32, 55, 70, 0.055);
}

.contact-title {
  margin: 46px 0 16px;
  padding-bottom: 8px;
  font-size: 1.25rem;
}

.email {
  display: block;
  color: var(--blue);
  font-weight: 600;
}

.email-note {
  color: var(--muted);
  font-size: 0.82rem;
}

/* ---------- 論文・発表(.entry) ---------- */

.entry {
  margin-bottom: 14px;
  padding: 18px 20px;
  background: var(--white);
  border: 1.5px solid var(--line);
  border-radius: 12px;
}

.title {
  margin-bottom: 10px;
  padding-bottom: 8px;
  color: var(--dark-navy);
  font-weight: 700;
  border-bottom: 1.5px solid #aebdc6;
}

/* 著者・掲載情報はタイトルより少し字下げ */
.authors,
.venue,
.info {
  margin-left: 1.25rem;
}

.venue {
  color: var(--text);
}

.info,
.note-meta {
  color: var(--muted);
}

.self-name {
  color: #234a68;
  font-weight: 700;
  background: #eaf6fb;
  padding: 0 3px;
  border-radius: 3px;
}

.links {
  margin-top: 8px;
}

.links a {
  color: var(--blue);
  text-decoration: none;
  font-weight: 600;
  margin-right: 16px;
}

.links a:hover {
  text-decoration: underline;
}

.award {
  display: inline-block;
  margin-top: 9px;
  padding: 3px 10px;
  border: 1px solid #ead9a9;
  border-radius: 999px;
  background: #fff6df;
  color: #7a5a14;
  font-size: 0.78rem;
  font-weight: 700;
}

/* ---------- ノート ---------- */

.notes-intro {
  margin: 0 0 24px;
  color: #4b5563;
}

.note-meta {
  margin-top: 4px;
  font-size: 0.92rem;
}

/* ---------- 経歴 ---------- */

.cv-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  padding: 12px 0;
  border-bottom: 1px solid #d9e1e6;
}

.cv-item:last-child {
  border-bottom: none;
}

.cv-year {
  color: var(--muted);
  white-space: nowrap;
}

.cv-content {
  line-height: 1.6;
}

.cv-content strong {
  color: var(--dark-navy);
}

/* ---------- スマホ ---------- */

@media (max-width: 700px) {
  .header-inner,
  main {
    padding-left: 20px;
    padding-right: 20px;
  }

  main {
    padding-top: 38px;
    padding-bottom: 70px;
  }

  .site-nav {
    gap: 14px;
  }

  /* 年と内容を縦に並べる */
  .cv-item {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}