/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #ede6d8;
  --color-surface: #f7f4ef;
  --color-beige: #e8ddd0;
  --color-beige-dark: #d8cabа;
  --color-accent: #9e7c4a;
  --color-accent-light: #b8965a;
  --color-text: #1e1a14;
  --color-text-muted: #6b6050;
  --color-border: #cdbea8;
  --font-main: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  --font-serif: 'Cormorant Garamond', 'Georgia', 'Times New Roman', serif;
  --max-width: 860px;
  --radius: 6px;
  --shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: linear-gradient(160deg, #fdf8f0 0%, #eedfc0 45%, #ddc49a 100%);
  background-attachment: fixed;
  color: var(--color-text);
  line-height: 1.75;
  font-size: 15px;
  min-height: 100vh;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: var(--color-accent-light);
}

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
  background: linear-gradient(90deg, #f2ebe0 0%, #e8ddd0 100%);
  border-bottom: 1px solid var(--color-border);
  padding: 20px 0;
}

/* ホームページ専用ヘッダー：名前なし、透過フローティング */
.site-header-home {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 100;
  display: flex;
  justify-content: flex-end;
  padding: 18px 32px;
  background: transparent;
  border: none;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color 0.15s;
}

.site-logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* 言語切り替えボタン */
.lang-switcher {
  display: flex;
  gap: 4px;
  align-items: center;
  white-space: nowrap;
}

.lang-btn {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
  font-family: var(--font-main);
}

.lang-btn:hover {
  background-color: var(--color-beige);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.lang-btn.active {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.site-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.site-subtitle {
  margin-top: 6px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* ===== Header Cyrillic Image ===== */
.header-pdf-wrap {
  margin-top: 24px;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  background-color: #ffefef;
  border-radius: var(--radius);
  padding: 16px;
}

.cyrillic-chars {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  justify-content: center;
  padding: 0 32px;
}

.cyrillic-char {
  width: calc((100% - 3px * 13 - 64px) / 14);
  height: auto;
  border-radius: 2px;
}

/* ===== Nav ===== */
.site-nav {
  background: linear-gradient(90deg, #e0d5c4 0%, #d4c8b4 100%);
  border-bottom: 1px solid var(--color-beige-dark);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 0;
}

.site-nav a {
  display: block;
  padding: 14px 22px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.04em;
  transition: background-color 0.15s, color 0.15s;
}

.site-nav a:hover {
  background-color: var(--color-beige-dark);
  color: var(--color-accent);
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
}

/* ===== Sections ===== */
main {
  padding: 48px 24px 64px;
}

.section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 40px;
  margin-bottom: 32px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--color-text);
  border-left: 3px solid var(--color-accent);
  padding-left: 14px;
  margin-bottom: 24px;
  letter-spacing: 0.06em;
}

/* ===== Profile ===== */
.profile-section {
  padding: 0;
  overflow: hidden;
}

.profile-card {
  display: grid;
  grid-template-columns: 220px 1fr;
}

.profile-photo-col {
  background: linear-gradient(160deg, var(--color-beige-dark) 0%, #c8b898 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}

.profile-img {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--color-accent-light);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  display: block;
}

.profile-info-col {
  padding: 36px 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.profile-name-block {
  border-left: 2px solid var(--color-accent-light);
  padding-left: 18px;
}

.profile-name-ja {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.06em;
  line-height: 1.2;
  margin: 0;
}

.profile-name-sub {
  margin-top: 4px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.profile-dl {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.profile-dl-row {
  display: flex;
  gap: 0;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--color-beige);
  padding: 9px 0;
}

.profile-dl-row:first-child {
  border-top: 1px solid var(--color-beige);
}

.profile-dl-row dt {
  width: 80px;
  flex-shrink: 0;
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.profile-dl-row dd {
  color: var(--color-text);
  margin: 0;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.profile-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-bg);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  text-decoration: none;
}

.profile-link-btn span {
  font-weight: 700;
  color: var(--color-accent);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.profile-link-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-beige);
  text-decoration: none;
}

/* ===== Keywords ===== */
.kw-hint {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.keyword-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.keyword-tag {
  background-color: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 5px 16px;
  border-radius: 20px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
  user-select: none;
}

.keyword-tag:hover {
  background-color: var(--color-accent);
  color: var(--color-surface);
}

.keyword-tag.active {
  background-color: var(--color-accent);
  color: var(--color-surface);
}

/* ── キーワード説明パネル ── */
.kw-panel {
  position: relative;
  margin-top: 24px;
  padding: 22px 28px 22px 24px;
  background: var(--color-surface);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: kwFadeIn 0.22s ease;
}

@keyframes kwFadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.kw-panel[hidden] {
  display: none;
}

.kw-panel-close {
  position: absolute;
  top: 12px;
  right: 14px;
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--color-text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
}

.kw-panel-close:hover {
  color: var(--color-text);
  background: var(--color-beige);
}

.kw-panel-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 10px;
  letter-spacing: 0.06em;
}

.kw-panel-body {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--color-text);
}

/* ===== Publications ===== */
.pub-category {
  margin-bottom: 28px;
}

.pub-category:last-child {
  margin-bottom: 0;
}

.pub-category-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 6px;
  margin-bottom: 14px;
  letter-spacing: 0.06em;
}

.pub-list {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pub-item {
  font-size: 0.9rem;
  line-height: 1.7;
}

.pub-authors {
  color: var(--color-text-muted);
}

.pub-title {
  font-weight: 600;
}

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

/* ===== View All Link ===== */
.view-all-wrap {
  margin-top: 20px;
  text-align: right;
}

.view-all-link {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent-light);
  padding-bottom: 1px;
  transition: color 0.15s, border-color 0.15s;
}

.view-all-link:hover {
  color: var(--color-accent-light);
  border-color: var(--color-accent-light);
  text-decoration: none;
}

/* ===== Cyrillic Section ===== */
.cyrillic-section {
  background-color: #ffefef !important;
  padding: 16px 20px;
}

/* ===== Teaching ===== */
.teaching-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.teaching-item {
  background-color: var(--color-beige);
  border: 1px solid var(--color-beige-dark);
  border-radius: var(--radius);
  padding: 10px 20px;
  font-size: 0.9rem;
  color: var(--color-text);
}

/* ===== Research Projects ===== */
.project-list {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.project-item {
  font-size: 0.9rem;
  line-height: 1.7;
}

.project-title {
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 2px;
}

.project-detail {
  color: var(--color-text-muted);
  margin: 0;
  font-size: 0.85rem;
}

/* ===== Publication Labels ===== */
.pub-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 10px;
  vertical-align: middle;
  margin-left: 4px;
}

.label-peer-review {
  background-color: #e8f0e8;
  color: #4a7a4a;
  border: 1px solid #b8d4b8;
}

.label-author {
  background-color: var(--color-beige);
  color: var(--color-accent);
  border: 1px solid var(--color-beige-dark);
}

/* ===== Footer ===== */
.site-footer {
  background: linear-gradient(90deg, #ddd2bf 0%, #d0c4ae 100%);
  border-top: 1px solid var(--color-beige-dark);
  text-align: center;
  padding: 24px 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===== Custom Cursor (Home Page) ===== */
body.page-home,
body.page-home * {
  cursor: none !important;
}

.cursor-dot {
  position: fixed;
  width: 5px;
  height: 5px;
  background: var(--color-accent);
  border-radius: 50%;
  pointer-events: none;
  z-index: 99999;
  left: -100px;
  top: -100px;
  transform: translate(-50%, -50%);
}

.cursor-ring {
  position: fixed;
  width: 28px;
  height: 28px;
  border: 1.5px solid var(--color-accent);
  border-radius: 50%;
  pointer-events: none;
  z-index: 99998;
  left: -100px;
  top: -100px;
  transform: translate(-50%, -50%);
  opacity: 0.55;
  transition: width 0.18s ease, height 0.18s ease, opacity 0.18s ease;
}

/* ===== Home Page Layout ===== */
.home-main {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ===== Home Profile (2-column: left=photo+network / right=info) ===== */
.home-profile {
  position: relative;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  max-width: 860px;
  width: 100%;
  min-height: 480px;
}

/* 左カラム：プロフィールアイコン＋ネットワーク図 */
.profile-left {
  position: relative;
  width: 50%;
  min-height: 480px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.profile-left .hero-img {
  width: 130px;
  height: 130px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid rgba(158, 124, 74, 0.40);
  box-shadow: 0 10px 36px rgba(0,0,0,0.12);
  display: block;
  position: relative;
  z-index: 2;
}

/* 右カラム：テキスト情報 */
.profile-right {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 48px 40px 48px 36px;
  position: relative;
  z-index: 2;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: 0.10em;
  line-height: 1.2;
  margin-bottom: 20px;
}

html[lang="ja"] .hero-name {
  font-size: 1.7rem;
  letter-spacing: 0.22em;
}

.hero-affil {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  letter-spacing: 0.10em;
  margin-bottom: 4px;
}

.hero-pos {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  letter-spacing: 0.09em;
  margin-bottom: 32px;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 16px;
}

.hero-link {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  border: none;
  border-bottom: 1px solid var(--color-border);
  padding: 2px 0 4px;
  transition: color 0.2s, border-color 0.2s;
  text-decoration: none;
}

.hero-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  text-decoration: none;
}

/* ===== Network Cyrillic Visualization ===== */
.network-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.network-node {
  position: absolute;
  cursor: grab;
  z-index: 1;
  user-select: none;
  -webkit-user-select: none;
}

/* ヒットエリアを視覚サイズより広げる透明な拡張領域 */
.network-node::before {
  content: '';
  position: absolute;
  inset: -14px;
}

/* ホバー・ドラッグ時は profile-content (z-index:2) より前面に */
.network-node:hover,
.network-node.dragging {
  z-index: 5;
}

.network-node-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  opacity: 0.50;
  pointer-events: none;
  transition: opacity 0.22s ease, filter 0.22s ease;
  -webkit-user-drag: none;
}

.network-node:hover .network-node-img,
.network-node.dragging .network-node-img {
  opacity: 0.92;
  filter: drop-shadow(0 2px 10px rgba(158, 124, 74, 0.40));
}

/* ホバー時：切り取り画像全体を表示するツールチップ */
.char-tooltip {
  position: fixed;
  display: none;
  z-index: 9999;
  background: rgba(247, 244, 239, 0.97);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 10px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.18);
  pointer-events: none;
}

.char-tooltip img {
  display: block;
  max-width: 240px;
  max-height: 200px;
  object-fit: contain;
  border-radius: 4px;
}

/* ===== Home Bottom Nav ===== */
.home-bottom-nav {
  display: flex;
  justify-content: center;
  gap: 0;
  padding: 0 32px 100px;
  width: 100%;
  max-width: 640px;
}

.bottom-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 40px 16px 28px;
  text-decoration: none;
  color: var(--color-text-muted);
  transition: color 0.25s;
}

.bottom-nav-label {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.18em;
}

.bottom-nav-bar {
  display: block;
  width: 20px;
  height: 1px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

.bottom-nav-item:hover {
  color: var(--color-text);
  text-decoration: none;
}

.bottom-nav-item:hover .bottom-nav-bar {
  width: 56px;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .site-title {
    font-size: 1.5rem;
  }

  .site-logo {
    font-size: 0.95rem;
  }

  .site-nav ul {
    justify-content: center;
  }

  .site-nav a {
    padding: 12px 14px;
    font-size: 0.8rem;
  }

  main {
    padding: 24px 0 48px;
  }

  .section {
    padding: 24px 20px;
    border-radius: 0;
    border-left: none;
    border-right: none;
    margin-bottom: 16px;
  }

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

  .profile-photo-col {
    padding: 32px 24px 24px;
  }

  .profile-img {
    width: 110px;
    height: 110px;
  }

  .profile-info-col {
    padding: 24px 20px;
  }

  .profile-name-ja {
    font-size: 1.4rem;
  }

  /* ホームプロフィール：モバイルは縦積み */
  .home-profile {
    flex-direction: column;
    min-height: 0;
  }

  .profile-left {
    width: 100%;
    min-height: 320px;
  }

  .profile-right {
    align-items: center;
    text-align: center;
    padding: 32px 24px 40px;
  }

  .hero-links {
    justify-content: center;
  }

  .hero-name {
    font-size: 1.9rem;
  }
}