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

:root {
  --color-primary: #ececec;
  --color-accent:  #d4d4d4;
  --color-text:    #d8d8d8;
  --color-muted:   #999999;
  --color-border:  #3a3a3a;
  --color-bg:      #222222;
  --color-bg-alt:  #2b2b2b;
  --font-sans: "Open Sans", "Noto Sans JP", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "Fira Code", "Consolas", monospace;
  --max-width: 860px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
}

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

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Header ===== */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
}
.site-title:hover { text-decoration: none; }

.site-nav { display: flex; gap: 1.5rem; }
.site-nav a {
  color: var(--color-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s;
}
.site-nav a:hover,
.site-nav a.active { color: var(--color-primary); text-decoration: none; }

/* ===== Main content ===== */
.page-content { padding: 3rem 0; min-height: calc(100vh - 140px); }

/* ===== About / Profile ===== */
.profile {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  align-items: start;
  margin-bottom: 3rem;
}

.profile-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
}

.profile-photo-placeholder {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 3px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--color-muted);
}

.profile-name { font-size: 1.8rem; font-weight: 700; color: var(--color-primary); }
.profile-position { color: var(--color-muted); margin-bottom: 0.5rem; }

.profile-links { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 0.75rem; }
.profile-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--color-text);
  transition: border-color 0.15s, color 0.15s;
}
.profile-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* ===== Language toggle ===== */
[hidden] { display: none !important; }
.lang-toggle {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.lang-btn {
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 0.8rem;
  cursor: pointer;
}
.lang-btn:hover { border-color: var(--color-accent); }
.lang-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}

/* ===== Section titles ===== */
.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

/* ===== News ===== */
.news-list { list-style: none; }
.news-list li {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}
.news-date { color: var(--color-muted); font-size: 0.85rem; padding-top: 0.1rem; }
.news-more { margin-top: 0.75rem; font-size: 0.9rem; }

/* ===== Publication extras (chart / table) ===== */
.pub-extras {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
}
.pub-chart-details { margin-bottom: 1rem; }
.pub-chart-details summary,
.pub-table-details summary {
  cursor: pointer;
  color: var(--color-muted);
  font-size: 0.8rem;
}
.pub-chart-details summary:hover,
.pub-table-details summary:hover { color: var(--color-accent); }
.pub-chart-details[open] summary,
.pub-table-details[open] summary { margin-bottom: 0.75rem; }
.pub-chart-wrap { margin-bottom: 1.5rem; }
.pub-chart-wrap svg { display: block; width: 100%; height: auto; }
.pub-chart-seg { cursor: pointer; }
.pub-chart-seg:hover, .pub-chart-seg:focus-visible { filter: brightness(1.08); outline: none; }
.pub-chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}
.pub-chart-legend-item { display: flex; align-items: center; gap: 0.4rem; }
.pub-chart-swatch { width: 10px; height: 10px; border-radius: 2px; display: inline-block; flex: none; }
.pub-chart-tooltip {
  position: fixed;
  pointer-events: none;
  background: var(--color-bg-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  font-size: 0.78rem;
  line-height: 1.4;
  padding: 0.4rem 0.65rem;
  border-radius: 4px;
  transform: translate(-50%, -100%);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.1s ease;
  z-index: 20;
}
.pub-chart-tooltip.visible { opacity: 1; }
.pub-chart-tooltip strong { font-weight: 700; }

.pub-table-details { margin-bottom: 0; }
.pub-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.pub-table th, .pub-table td {
  padding: 0.4rem 0.6rem;
  text-align: right;
  border-bottom: 1px solid var(--color-border);
  font-variant-numeric: tabular-nums;
}
.pub-table th:first-child, .pub-table td:first-child { text-align: left; font-variant-numeric: normal; }
.pub-table thead th { color: var(--color-muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; }

/* ===== Publications ===== */
.pub-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.pub-controls-label { color: var(--color-muted); font-size: 0.9rem; margin-right: 0.25rem; }
.pub-sort-btn {
  padding: 0.35rem 0.9rem;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 0.85rem;
  cursor: pointer;
}
.pub-sort-btn:hover { border-color: var(--color-accent); }
.pub-sort-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}
.pub-list { list-style: none; }
.pub-item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}
.pub-title { font-weight: 600; margin-bottom: 0.25rem; }
.pub-authors { color: var(--color-muted); font-size: 0.9rem; margin-bottom: 0.25rem; }
.pub-authors .me { color: var(--color-text); font-weight: 600; }
.pub-venue { font-size: 0.9rem; font-style: italic; margin-bottom: 0.5rem; }
.pub-badges { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 3px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.badge-pdf   { background: #ebf8ff; color: #2b6cb0; border: 1px solid #bee3f8; }
.badge-arxiv { background: #fff5f5; color: #c53030; border: 1px solid #fed7d7; }
.badge-code  { background: #f0fff4; color: #276749; border: 1px solid #c6f6d5; }
.badge-doi   { background: #faf5ff; color: #6b46c1; border: 1px solid #e9d8fd; }
.badge-project { background: #ebf8ff; color: #2c5282; border: 1px solid #bee3f8; }

/* ===== Projects ===== */
.project-feed {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.project-feed-item { display: block; }

.project-feed-link {
  display: block;
  color: inherit;
  text-decoration: none;
}
.project-feed-link:hover { text-decoration: none; }

.project-feed-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
  transition: box-shadow 0.2s, transform 0.2s;
}
.project-feed-link:hover .project-feed-thumb {
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  transform: translateY(-2px);
}
.project-feed-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }

.project-feed-body h3 {
  font-size: 1.3rem;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}
.project-feed-link:hover .project-feed-body h3 { color: var(--color-accent); }
.project-feed-desc { color: var(--color-text); margin-bottom: 0.4rem; }
.project-feed-meta { color: var(--color-muted); font-size: 0.85rem; margin-bottom: 0.6rem; }
.project-feed-more {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-accent);
  margin-top: 0.4rem;
}
.project-feed-links { margin-top: 0.75rem; }

.project-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.25rem; }
.tag {
  font-size: 0.78rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 0.1rem 0.5rem;
  color: var(--color-muted);
}
.project-links { margin-top: 0.75rem; display: flex; gap: 0.5rem; }
.project-links a {
  font-size: 0.85rem;
  color: var(--color-accent);
}

/* ===== Project detail page ===== */
.project-detail { max-width: 720px; }
.back-link {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 1.25rem;
}
.back-link:hover { color: var(--color-accent); }
.project-detail-title { font-size: 1.6rem; font-weight: 700; color: var(--color-primary); margin-bottom: 0.4rem; }
.project-detail-meta { color: var(--color-muted); font-size: 0.9rem; margin-bottom: 1rem; }
.project-detail-image {
  width: 100%;
  border-radius: 8px;
  margin-bottom: 1rem;
  border: 1px solid var(--color-border);
}
.project-detail .project-tags { margin-bottom: 1.25rem; }
.project-detail-body { line-height: 1.8; }
.project-detail-body p { margin-bottom: 1rem; }
.project-detail .project-links { margin-top: 1.5rem; }
.project-detail .project-links a {
  padding: 0.35rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}
.project-detail .project-links a:hover { border-color: var(--color-accent); text-decoration: none; }

.project-detail-video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1.25rem;
  background: #000;
}
.project-detail-video iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.project-slides-pdf {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1.25rem;
  border: 1px solid var(--color-border);
  background: #fff;
}
.project-slides-pdf iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.project-detail-subhead {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 1.75rem 0 0.6rem;
}
.project-pub-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.5rem;
}
.project-pub-box .project-detail-subhead { margin-top: 0; }
.project-pub-authors { font-size: 0.9rem; margin-bottom: 0.3rem; }
.project-pub-citation { font-size: 0.9rem; line-height: 1.6; margin-bottom: 0.3rem; }
.project-pub-venue { font-size: 0.9rem; font-style: italic; color: var(--color-muted); }
.project-pub-box .project-links { margin-top: 0.75rem; }
.project-abstract { color: var(--color-text); line-height: 1.8; }

.project-award-list { display: flex; flex-direction: column; gap: 0.75rem; }
.project-award-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}
.project-award-icon { font-size: 1.2rem; line-height: 1.4; }
.project-award-name { font-weight: 600; color: var(--color-text); }
.project-award-venue { font-size: 0.85rem; color: var(--color-muted); margin-top: 0.15rem; }

/* ===== CV ===== */
.cv-section { margin-bottom: 2.5rem; }
.cv-entry {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}
.cv-year { color: var(--color-muted); font-size: 0.9rem; padding-top: 0.1rem; }
.cv-title { font-weight: 600; }
.cv-sub { color: var(--color-muted); font-size: 0.9rem; }

.cv-download {
  display: inline-block;
  margin-bottom: 2rem;
  padding: 0.6rem 1.25rem;
  background: var(--color-primary);
  color: var(--color-bg);
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.15s;
}
.cv-download:hover { background: var(--color-accent); text-decoration: none; color: var(--color-bg); }

/* ===== Markdown body ===== */
.markdown-body h1 { font-size: 1.6rem; margin: 1.5rem 0 0.75rem; color: var(--color-primary); }
.markdown-body h2 { font-size: 1.3rem; margin: 1.5rem 0 0.75rem; color: var(--color-primary); }
.markdown-body h3 { font-size: 1.1rem; margin: 1.2rem 0 0.5rem; }
.markdown-body p { margin-bottom: 1rem; }
.markdown-body ul, .markdown-body ol { margin: 0.75rem 0 1rem 1.5rem; }
.markdown-body li { margin-bottom: 0.25rem; }
.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-bg-alt);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  background: var(--color-bg-alt);
}
.site-footer .container { text-align: center; }
.footer-links { display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 0.5rem; }
.footer-links a { color: var(--color-muted); font-size: 0.9rem; }
.footer-copy { color: var(--color-muted); font-size: 0.85rem; }

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .profile { grid-template-columns: 1fr; }
  .profile-photo, .profile-photo-placeholder { width: 120px; height: 120px; }
  .cv-entry { grid-template-columns: 1fr; }
  .cv-year { margin-bottom: -0.5rem; }
  .news-list li { grid-template-columns: 1fr; }
  .news-date { margin-bottom: -0.25rem; }
}