/* =========================================
   カラーテーマ（ライト基準）
   ========================================= */
:root {
  --bg: #f5f5f7;         /* ページ背景（ほぼ白） */
  --fg: #111827;         /* 本文テキスト（かなり濃いグレー） */
  --muted: #4b5563;      /* サブテキスト用（やや濃いめに調整） */
  --accent: #2563eb;     /* ボタン・リンクの青 */
  --accent-soft: rgba(37, 99, 235, 0.10);
  --border: #e5e7eb;
  --shadow-soft: 0 16px 40px rgba(15, 23, 42, 0.10);
  --max-width: 980px;
  --radius-lg: 14px;
  --radius-md: 10px;
}

/* data-theme="dark" が付いているときだけダークパレットに差し替え */
[data-theme="dark"] {
  --bg: #020617;
  --fg: #e5e7eb;
  --muted: #9ca3af;
  --accent: #60a5fa;
  --accent-soft: rgba(96, 165, 250, 0.20);
  --border: #1f2937;
  --shadow-soft: 0 20px 50px rgba(15, 23, 42, 0.7);
}

/* =========================================
   ベース
   ========================================= */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: "Inter", "Noto Sans JP", system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Meiryo", sans-serif;
  line-height: 1.7;
  font-size: 15px;          /* ほんの少しだけ大きく */
  color: var(--fg);
  background: var(--bg);
}

.page-main {
  padding-bottom: 48px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 18px;
}

/* =========================================
   ヘッダー & ナビ（レイアウトは元に戻す）
   ========================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.20), transparent 55%),
              radial-gradient(circle at top right, rgba(56, 189, 248, 0.18), transparent 60%),
              #020617;
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.header-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 18px 8px;
}
.brand-main {
  font-weight: 700;
  font-size: 18px;
  color: #f9fafb;
  text-decoration: none;
  letter-spacing: 0.02em;
}
.brand-sub {
  font-size: 12px;
  color: #cbd5f5;
  margin-top: 2px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
}
.nav a {
  color: #cbd5f5;
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 999px;
  transition:
    background 0.15s ease,
    color 0.15s ease,
    transform 0.1s ease;
}
.nav a:hover {
  background: rgba(148, 163, 184, 0.25);
  color: #e5e7eb;
  transform: translateY(-1px);
}

/* ダーク/ライト切替ボタン */
.theme-toggle {
  margin-left: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: transparent;
  color: #e5e7eb;
  font-size: 12px;
  cursor: pointer;
}
.theme-toggle:hover {
  background: rgba(148, 163, 184, 0.25);
}

/* =========================================
   Hero（レイアウト / 余白は元デザイン）
   ========================================= */
.hero {
  padding: 26px 0 18px;
  background: radial-gradient(900px 600px at 0% 0%, rgba(37, 99, 235, 0.35), transparent 60%),
              radial-gradient(900px 600px at 100% -10%, rgba(6, 182, 212, 0.35), transparent 70%),
              #020617;
  color: #e5e7eb;
}
.hero-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1.6fr);
  gap: 24px;
  align-items: center;
}
.hero-photo img {
  width: 140px;
  height: 140px;
  border-radius: 32px;
  object-fit: cover;
  border: 1px solid rgba(148, 163, 184, 0.45);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.8);
}

.hero-text h1 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: 0.03em;
}
.hero-affil {
  margin: 0 0 4px;
  font-size: 14px;
  color: #cbd5f5;
}
.hero-role {
  margin: 0 0 14px;
  font-size: 14px;
  color: #e5e7eb;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}
.hero-badges span {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.85);
  color: #e5e7eb;
  border: 1px solid rgba(148, 163, 184, 0.45);
}

.hero-links-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
}

/* ボタン */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7eb;
  font-size: 13px;
  text-decoration: none;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.5);
  transition:
    background 0.15s ease,
    box-shadow 0.15s ease,
    transform 0.1s ease,
    border-color 0.15s ease;
}
.btn.primary {
  border-color: #60a5fa;
  background: #60a5fa;
  color: #020617;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}

/* アイコンリンク（元の並びに戻す） */
.hero-meta-icons {
  display: flex;
  align-items: center;
  gap: 8px;
}
.icon-link {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7eb;
  text-decoration: none;
  font-size: 15px;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.7);
  transition:
    transform 0.1s ease,
    box-shadow 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease,
    background 0.15s ease;
}
.icon-link img {
  width: 18px;
  height: 18px;
  display: block;
}

/* ライトテーマのときだけ白アイコンを反転して見えるように */
[data-theme="light"] .icon-link img[src$="github-mark-white.png"],
[data-theme="light"] .icon-link img[src$="in.png"] {
  filter: invert(0.9) contrast(1.1);
}
/* ダークではそのまま */
[data-theme="dark"] .icon-link img[src$="github-mark-white.png"],
[data-theme="dark"] .icon-link img[src$="in.png"] {
  filter: none;
}

.icon-link:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
  border-color: #60a5fa;
  background: #0b1120;
}

/* スクリーンリーダー用 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* =========================================
   セクション共通
   ========================================= */
.section {
  padding: 20px 0 8px;
}
.section-card {
  padding: 8px 0;
}
.section-card .container {
  padding-top: 14px;
  padding-bottom: 12px;
  border-radius: var(--radius-lg);
  background: #ffffff;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--border);
}

/* 見出し */
h2 {
  position: relative;
  margin: 0 0 14px;
  font-size: 18px;
  letter-spacing: 0.06em;
}
h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 42px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--accent), transparent);
}
section p { margin: 0 0 8px; }

/* =========================================
   News（行間など元のまま）
   ========================================= */
.news-list {
  list-style: none;
  padding-left: 0;
  margin: 6px 0 4px;
}
.news-list li {
  padding: 6px 0;
  border-bottom: 1px dashed rgba(148, 163, 184, 0.4);
}
.news-list li:last-child {
  border-bottom: none;
}
.news-date {
  display: block;
  font-size: 12px;
  color: var(--muted);
}
.news-body {
  display: block;
  font-size: 13px;
}

/* =========================================
   Awards / Talks 等
   ========================================= */
.bullet-list {
  padding-left: 18px;
  margin: 0;
  font-size: 13px;
}

/* =========================================
   2カラム（Interests + Experience / Profile）
   ========================================= */
.two-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  gap: 26px;
  align-items: flex-start;
  margin-top: 4px;
}
.col-left > section {
  margin-bottom: 26px;
}

/* Research Interests（タグ表示） */
.tag-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag-list li {
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}

/* Experience timeline（縦タイムラインに戻す） */
.timeline {
  list-style: none;
  padding-left: 0;
  border-left: 2px solid var(--border);
  margin-left: 6px;
}
.timeline li {
  position: relative;
  padding: 0 0 16px 14px;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 3px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
}
.timeline-year {
  font-weight: 600;
  font-size: 12px;
  color: var(--muted);
}
.timeline-title {
  font-size: 13px;
  margin-top: 2px;
}
.timeline-desc {
  font-size: 12px;
  color: var(--muted);
}

/* 右カラム：プロフィール＋リンク */
.col-right {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.profile-card {
  padding: 14px 14px 12px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: #ffffff;
  box-shadow: var(--shadow-soft);
  text-align: center;
}
.profile-photo2 {
  display: flex;
  justify-content: center;
  margin-bottom: 8px;
}
.profile-photo2 img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}
.profile-name {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 2px;
}
.profile-role {
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 8px;
}
.profile-icons {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 6px;
}

/* Quick Links カード */
.quick-card {
  padding: 10px 12px 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: #ffffff;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.07);
}
.sidebar-heading {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 600;
}
.quick-links {
  list-style: none;
  padding-left: 0;
  margin: 0;
  font-size: 12px;
}
.quick-links li {
  margin-bottom: 4px;
}
.quick-links a {
  color: var(--accent);
  text-decoration: none;
}
.quick-links a:hover {
  text-decoration: underline;
}

/* =========================================
   Publications（フォント小さめのまま）
   ========================================= */
.pub-list {
  padding-left: 20px;
  margin: 6px 0 0;
  font-size: 13px;
}
.pub-list li {
  margin-bottom: 10px;
}
.pub-title {
  font-weight: 600;
}
.pub-authors,
.pub-venue {
  font-size: 12px;
  color: var(--muted);
}

/* =========================================
   Contact
   ========================================= */
#contact p {
  font-size: 13px;
}

/* =========================================
   フッター
   ========================================= */
.site-footer {
  border-top: 1px solid rgba(148, 163, 184, 0.3);
  padding: 12px 0 18px;
  font-size: 11px;
  color: var(--muted);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.back-to-top {
  color: var(--muted);
  text-decoration: none;
}
.back-to-top:hover {
  color: var(--accent);
}

/* 共通リンク */
a {
  color: var(--accent);
}
a:hover {
  text-decoration: underline;
}

/* =========================================
   レスポンシブ
   ========================================= */
@media (max-width: 840px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }
  .hero-photo {
    display: flex;
    justify-content: center;
  }
  .hero-photo img {
    width: 120px;
    height: 120px;
  }

  .two-columns {
    grid-template-columns: minmax(0, 1fr);
  }
  .profile-card {
    max-width: 340px;
    margin: 0 auto;
  }
}

@media (max-width: 520px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav {
    justify-content: flex-start;
  }
  .hero-text h1 {
    font-size: 24px;
  }
  .btn {
    font-size: 12px;
    padding: 6px 12px;
  }
}

/* =========================================
   Dark theme で News / Awards を見やすく
   （テキストをしっかり白に）
   ========================================= */
[data-theme="dark"] #news,
[data-theme="dark"] #awards {
  color: #ffffff;
}
[data-theme="dark"] #news h2,
[data-theme="dark"] #awards h2,
[data-theme="dark"] #news .news-date,
[data-theme="dark"] #news .news-body,
[data-theme="dark"] #awards .bullet-list li,
[data-theme="dark"] #awards b {
  color: #ffffff;
}
[data-theme="dark"] .section-card .container,
[data-theme="dark"] .profile-card,
[data-theme="dark"] .quick-card {
  background: #020617;
  border-color: #1f2937;
}

/* ============================
   Light theme 用のヘッダー & Hero 修正
   ============================ */
[data-theme="light"] .site-header {
  background: rgba(247, 247, 249, 0.97);
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

[data-theme="light"] .hero {
  background: #ffffff;
  color: var(--fg);
}

[data-theme="light"] .hero-badges span {
  background: rgba(255, 255, 255, 0.92);
  color: var(--muted);
  border-color: rgba(148, 163, 184, 0.35);
}

[data-theme="light"] .icon-link {
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(148, 163, 184, 0.45);
  color: var(--fg);
}

/* =====================================
   Light theme のヘッダ文字色の修正
   ===================================== */
[data-theme="light"] .site-header,
[data-theme="light"] .site-header a,
[data-theme="light"] .brand-main,
[data-theme="light"] .brand-sub,
[data-theme="light"] .nav a {
  color: #1a1a1a !important;   /* 濃いグレーで視認性UP */
}
/* =====================================
   Light theme: hero 部の紹介文を濃くする
   ===================================== */
[data-theme="light"] .hero-affil,
[data-theme="light"] .hero-role {
  color: #222 !important;     /* しっかり濃いグレー */
  font-weight: 500;           /* 少しだけ太くして視認性UP */
}
/* ===== NEW badge for News ===== */
.news-badge {
  display: inline-block;
  margin-right: 6px;
  padding: 2px 6px;
  font-size: 10px;
  font-weight: 600;
  color: #ffffff;
  background: #ef4444;        /* 赤系。#4f46e5 などに変更も可 */
  border-radius: 4px;
  vertical-align: middle;
}

/* ダークモードでも見えるように */
@media (prefers-color-scheme: dark) {
  .news-badge {
    background: #f87171;      /* 明るめの赤 */
  }
}

/* 左側に NEW バッジを置くレイアウト */
.news-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;                    /* バッジと本文の間隔 */
  padding: 6px 0;
  border-bottom: 1px dashed rgba(148,163,184,0.4);
}

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

/* NEW バッジ */
.news-badge {
  display: inline-block;
  padding: 2px 6px;
  font-size: 10px;
  font-weight: 600;
  color: #fff;
  background: #ef4444;         /* 赤系 */
  border-radius: 4px;
  margin-top: 2px;             /* 日付と高さを合わせるために微調整 */
}

@media (prefers-color-scheme: dark) {
  .news-badge {
    background: #f87171;       /* ダーク用の明るい赤 */
  }
}

/* 日付＋本文を縦並び */
.news-main {
  display: flex;
  flex-direction: column;
}

.news-date {
  font-size: 12px;
  color: var(--muted);
}

.news-body {
  font-size: 13px;
}

#awards .bullet-list li {
  margin-bottom: 12px;   /* ← 行間を少し広げる（適度にゆとり） */
  line-height: 1.6;      /* ← 読みやすさ向上 */
}

/* ===== Projects (list style with unified date format) ===== */
.project-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.project-list li {
  padding: 10px 0 12px;
  border-bottom: 1px dashed rgba(148, 163, 184, 0.35);
  display: flex;
  gap: 14px;
}

.project-list li:last-child {
  border-bottom: none;
}

.proj-year {
  width: 110px;              /* Experience と同じような幅感 */
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  flex-shrink: 0;
}

.proj-body {
  flex: 1;
}

.proj-title {
  font-size: 14px;
  margin-bottom: 2px;
}

.proj-desc {
  font-size: 13px;
  color: var(--muted);
}