/* 共通カラー */
:root {
  --ink: #111827;
  --muted: #667085;
  --line: #e5e7eb;
  --accent: #2457ff;
  --paper: #fbfbfc;
}

/* ページ全体の基本設定 */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter,"Noto Sans JP","Yu Gothic",Meiryo,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height: 1.75;
}

/* ヘッダーとナビゲーション */
header {
  height: 72px;
  padding: 0 max(5vw,24px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: rgba(251,251,252,.92);
  backdrop-filter: blur(12px);
  z-index: 10;
}

.logo {
  font-weight: 800;
  letter-spacing: .08em;
}

.rightnav {
  display: flex;
  align-items: center;
  gap: 28px;
}

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

nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
}

.lang {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 11px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
  background: white;
}

/* コンテンツ幅とトップの基本レイアウト */
main,footer {
  max-width: 1180px;
  margin: auto;
  padding-left: 32px;
  padding-right: 32px;
}

.hero {
  min-height: 78vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 0;
}

.eyebrow,.section-title>p,.tag {
  font-size: 12px;
  letter-spacing: .15em;
  font-weight: 700;
  color: var(--accent);
}

/* 見出し・リード文・ボタン */
h1 {
  font-size: clamp(52px,8.5vw,108px);
  line-height: 1;
  letter-spacing: -.055em;
  margin: 18px 0 32px;
  max-width: 1050px;
}

html[lang="ja"] h1 {
  letter-spacing: -.045em;
}

h1 span {
  color: #98a2b3;
}

.lead {
  font-size: clamp(18px,2vw,24px);
  max-width: 760px;
  color: var(--muted);
}

.actions {
  display: flex;
  gap: 22px;
  align-items: center;
  margin-top: 28px;
  flex-wrap: wrap;
}

.primary {
  background: var(--ink);
  color: white;
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 14px;
}

/* セクション見出しとAbout本文 */
section:not(.hero) {
  padding: 110px 0;
  border-top: 1px solid var(--line);
}

.section-title {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 30px;
  margin-bottom: 56px;
}

.section-title h2 {
  font-size: clamp(34px,5vw,58px);
  line-height: 1.15;
  letter-spacing: -.04em;
  margin: 0;
}

.about {
  margin-left: 33.33%;
  max-width: 720px;
  font-size: 19px;
  color: #344054;
}

/* 研究・プロジェクトのカードと経歴 */
.grid {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 18px;
}

.research article,.projects article,.pubbox {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 30px;
  background: white;
}

.research b {
  font-size: 12px;
  color: #98a2b3;
}

.research h3,.projects h3,.pubbox h3 {
  font-size: 25px;
  margin: 28px 0 8px;
}

.research p,.projects p,.pubbox p {
  color: var(--muted);
}

.visual {
  height: 210px;
  border-radius: 12px;
  background: linear-gradient(135deg,#eef2ff,#f2f4f7);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
  font-weight: 800;
  letter-spacing: -.06em;
  color: #98a2b3;
  margin-bottom: 24px;
}

.tag {
  margin-bottom: -18px!important;
}

.pubbox {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.career>div {
  display: grid;
  grid-template-columns: 1fr 2fr;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

.career span {
  color: var(--muted);
  font-size: 14px;
}

.career h3 {
  margin: 0;
  font-size: 20px;
}

/* フッター */
footer {
  border-top: 1px solid var(--line);
  padding-top: 55px;
  padding-bottom: 55px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  color: var(--muted);
  font-size: 13px;
}

footer b {
  color: var(--ink);
}

/* スマートフォン向けの基本レイアウト */
@media(max-width:760px) {
  nav {
    display: none;
  }

  .rightnav {
    gap: 10px;
  }

  main,footer {
    padding-left: 20px;
    padding-right: 20px;
  }

  .hero {
    min-height: 70vh;
  }

  .section-title,.career>div,footer {
    grid-template-columns: 1fr;
  }

  .about {
    margin-left: 0;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .pubbox {
    align-items: flex-start;
    flex-direction: column;
  }

  section:not(.hero) {
    padding: 75px 0;
  }

  .visual {
    height: 160px;
  }
}

/* 自己紹介と、開発組織ごとのプロジェクト。 */
.about p:first-child {
  margin-top: 0;
}

.project-group+.project-group {
  margin-top: 64px;
}

.organization-heading {
  margin: 0 0 24px;
  font-size: clamp(24px,3vw,32px);
  line-height: 1.4;
}

.projects h4 {
  font-size: 25px;
  margin: 28px 0 8px;
  line-height: 1.4;
}

.project-image {
  height: auto;
  aspect-ratio: 16/10;
  background: #f2f4f7;
  overflow: hidden;
  padding: 16px;
}

.project-image img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: contain;
}

section[id] {
  scroll-margin-top: 90px;
}

@media(max-width:760px) {
  .project-group+.project-group {
    margin-top: 48px;
  }

  .projects article {
    padding: 22px;
  }
}

/* トップの氏名と研究テーマ。 */
.hero h1 {
  font-size: clamp(40px, 5vw, 64px);
  margin-bottom: 20px;
  line-height: 1.15;
}

.hero-name-en {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 20px;
  letter-spacing: .08em;
}

.hero-theme {
  margin: 0;
  color: var(--accent);
  font-size: clamp(22px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.4;
}

/* 自己紹介の横にプロフィール写真を配置。 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(28px, 5vw, 64px);
}

.hero-identity, .hero-details {
  min-width: 0;
}

.hero-portrait img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 24px;
}

.hero-theme {
  font-size: clamp(22px, 3vw, 34px);
}

/* SOBITSの縦長画像。画面幅に応じて4列・2列・1列に変更。 */
.sobits-projects {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.sobits-projects article {
  padding: 18px;
}

.sobits-projects .project-image {
  aspect-ratio: 9 / 13;
  height: auto;
  padding: 8px;
}

.sobits-projects h4 {
  font-size: 22px;
}

.sobits-projects .tag {
  font-size: 10px;
  letter-spacing: .08em;
}

@media (max-width: 1000px) {
  .sobits-projects {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-portrait {
    width: 100%;
    max-width: 400px;
    justify-self: center;
  }
}

@media (max-width: 480px) {
  .sobits-projects {
    grid-template-columns: 1fr;
  }
}

/* SNSリンク。透明背景の白いロゴを濃色背景に配置。 */
.profile-links {
  display: grid;
  grid-template-columns: repeat(8, 52px);
  gap: 10px;
  width: fit-content;
  max-width: 100%;
  list-style: none;
  margin: 20px 0 0;
  padding: 12px;
  background: #111827;
  border-radius: 16px;
}

.profile-links li {
  min-width: 0;
}

.profile-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 10px;
}

.profile-links img {
  display: block;
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: 12px;
}

.profile-links a:hover {
  background: #334155;
}

.profile-links a:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 1px;
  background: #334155;
}

/* 写真とリンク欄の下端をそろえる。 */
.hero-portrait {
  align-self: end;
}

@media (min-width: 761px) and (max-width: 1100px), (max-width: 550px) {
  .profile-links {
    grid-template-columns: repeat(4, 52px);
  }
}

/* 組織名の横に活動期間を表示。 */
.organization-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 24px;
}

.organization-header .organization-heading {
  margin: 0;
}

.organization-period {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

/* プロジェクトが1件の場合は横幅いっぱいに表示。 */
.projects-single {
  grid-template-columns: minmax(0, 1fr);
}

/* researchmapから取得した所属・経歴・研究業績。 */
.sync-note {
  color: var(--muted);
  font-size: 13px;
  margin: 12px 0 24px;
}
.sync-note a, .publication-list a {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.publication-list {
  padding-left: 24px;
  margin-bottom: 36px;
}
.publication-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  overflow-wrap: anywhere;
}
.publication-list a { font-weight: 600; }
.publication-list p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.affiliation-list {
  padding-left: 24px;
  margin-bottom: 36px;
}
.affiliation-list li { margin: 12px 0; }
.career h4 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  overflow-wrap: anywhere;
}

/* HTMLの順序は氏名→写真→テーマ・リンク。PCでは写真を右側に配置。 */
.hero {
  grid-template-areas: "identity portrait" "details portrait";
  row-gap: 0;
}
.hero-identity {
  grid-area: identity;
  align-self: end;
}
.hero-details {
  grid-area: details;
  align-self: start;
}
.hero-portrait {
  grid-area: portrait;
}

/* FromEARTHの船内ロボットを2枚の画像で紹介。 */
.project-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}
.project-gallery .project-image {
  margin-bottom: 0;
}
@media (max-width: 760px) {
  .hero {
    grid-template-areas: "identity" "portrait" "details";
    row-gap: 24px;
  }
  .hero-identity .hero-name-en {
    margin-bottom: 0;
  }
  .hero-identity h1 {
    margin-bottom: 12px;
  }
  .hero-details .lead br {
    display: none;
  }
  .project-gallery {
    grid-template-columns: 1fr;
  }
}

/* 組織名から公式サイトへ移動。 */
.organization-name {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 16px;
}
.organization-link {
  color: var(--muted);
  font-size: 13px;
  font-weight: 400;
  white-space: nowrap;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.organization-link:hover {
  text-decoration-thickness: 2px;
}
.organization-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* SOBITSの関連サイトを見出しの下にまとめる。 */
.organization-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  flex-basis: 100%;
}
.organization-links .organization-link {
  white-space: normal;
}

/* PCでは写真を少し上へ。スマートフォンの表示順序は維持。 */
@media (min-width: 761px) {
  .hero-portrait {
    position: relative;
    top: -48px;
  }
}