/* ---------- Theme tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --text: #1f2328;
  --text-muted: #5b6470;
  --border: #e3e6ea;
  --accent: #0a6c8f;
  --accent-soft: rgba(10, 108, 143, 0.08);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 14px rgba(0, 0, 0, 0.05);
  --max-width: 880px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15181c;
    --bg-soft: #1d2126;
    --text: #e6e8eb;
    --text-muted: #9aa3ad;
    --border: #2c3238;
    --accent: #5cc1e6;
    --accent-soft: rgba(92, 193, 230, 0.12);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="dark"] {
  --bg: #15181c;
  --bg-soft: #1d2126;
  --text: #e6e8eb;
  --text-muted: #9aa3ad;
  --border: #2c3238;
  --accent: #5cc1e6;
  --accent-soft: rgba(92, 193, 230, 0.12);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.65;
  transition: background-color 0.2s, color 0.2s;
}

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

img { max-width: 100%; height: auto; }

h1, h2, h3, h4 { line-height: 1.25; font-weight: 500; }

hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
}

.nav-brand { color: var(--text); font-size: 1.15rem; font-weight: 300; }
.nav-brand:hover { text-decoration: none; }
.nav-brand .first, .about-name .first { font-weight: 700; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a { color: var(--text); font-size: 0.98rem; }
.nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-links a.active { color: var(--accent); font-weight: 500; }

.theme-toggle {
  background: none;
  border: 0;
  color: var(--text);
  cursor: pointer;
  font-size: 1rem;
  padding: 4px;
}
.theme-toggle:hover { color: var(--accent); }
.theme-toggle .fa-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .fa-sun { display: inline; }
:root[data-theme="dark"] .theme-toggle .fa-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .fa-sun { display: inline; }
  :root:not([data-theme="light"]) .theme-toggle .fa-moon { display: none; }
}

.nav-toggle, .nav-toggle-label { display: none; }

@media (max-width: 640px) {
  .nav { flex-wrap: wrap; }
  .nav-toggle-label {
    display: block;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 8px 0 8px 8px;
  }
  .nav-links {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.6rem;
    padding: 0.5rem 0 1rem;
  }
  .nav-toggle:checked ~ .nav-links { display: flex; }
}

/* ---------- Page scaffolding ---------- */
.page-content { padding-top: 2.5rem; padding-bottom: 3rem; min-height: calc(100vh - 140px); }

.page-header { margin-bottom: 2rem; }
.page-title { font-size: 2.4rem; font-weight: 300; margin: 0 0 0.4rem; }
.page-description { color: var(--text-muted); margin: 0; }

.section { margin-top: 3rem; }
.section-title {
  font-size: 1.6rem;
  font-weight: 300;
  color: var(--accent);
  margin: 0 0 1rem;
}

/* ---------- About ---------- */
.about::after { content: ""; display: block; clear: both; }

.about-name { font-size: 2.8rem; font-weight: 300; margin: 0; }
.about-tagline { color: var(--text-muted); margin: 0.3rem 0 1.5rem; font-size: 0.98rem; }

.profile {
  float: right;
  width: 240px;
  margin: 0 0 1rem 2rem;
  text-align: center;
}
.profile img { border-radius: 6px; box-shadow: var(--shadow); display: block; }
.profile figcaption { font-size: 0.85rem; color: var(--text-muted); margin-top: 0.6rem; line-height: 1.5; }

.about-bio p { margin: 0 0 1rem; text-align: justify; hyphens: auto; }

.social { display: flex; gap: 1.1rem; font-size: 1.7rem; margin-top: 1.5rem; }
.social a { color: var(--text-muted); }
.social a:hover { color: var(--accent); text-decoration: none; }

@media (max-width: 640px) {
  .about-name { font-size: 2.2rem; }
  .profile { float: none; width: 200px; margin: 0 auto 1.5rem; }
  .about-bio p { text-align: left; }
  .social { justify-content: center; }
}

/* ---------- News ---------- */
.news { width: 100%; border-collapse: collapse; }
.news th {
  width: 96px;
  text-align: left;
  vertical-align: top;
  font-weight: 500;
  white-space: nowrap;
  padding: 0.45rem 1rem 0.45rem 0;
}
.news td { padding: 0.45rem 0; }
.news tr + tr { border-top: 1px solid var(--border); }

/* ---------- Publications ---------- */
.pubs { list-style: none; margin: 0; padding: 0; }

.pub {
  display: flex;
  gap: 1.5rem;
  padding: 1.1rem 0;
}
.pub + .pub { border-top: 1px solid var(--border); }

.pub-thumb { flex: 0 0 180px; }
.pub-thumb img {
  width: 100%;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: #fff;
  display: block;
}

.pub-body { flex: 1; min-width: 0; }
.pub-title { display: block; color: var(--text); font-weight: 500; font-size: 1.02rem; line-height: 1.4; }
.pub-title:hover { color: var(--accent); }
.pub-authors { font-size: 0.93rem; margin: 0.3rem 0 0.1rem; }
.pub-authors strong { font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.pub-venue { font-size: 0.93rem; color: var(--text-muted); margin: 0; }

.pub-links { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.6rem; }
.btn {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text);
  border: 1px solid var(--text-muted);
  border-radius: 3px;
  padding: 0.12rem 0.55rem;
}
.btn:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); text-decoration: none; }

.year {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
  margin: 2rem 0 0.5rem;
}

.more { margin-top: 1rem; }

@media (max-width: 640px) {
  .pub { flex-direction: column; gap: 0.75rem; }
  .pub-thumb { flex-basis: auto; max-width: 280px; }
}

/* Publication detail page */
.publication .page-title { font-size: 2rem; font-weight: 400; }
.publication .pub-authors, .publication .pub-venue { font-size: 1rem; }
.pub-teaser { margin: 2rem 0; }
.pub-teaser img { border-radius: 6px; border: 1px solid var(--border); background: #fff; }
.abstract p { text-align: justify; hyphens: auto; }

/* ---------- Project cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}
.card {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
}
a.card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12); text-decoration: none; }
.card-img { aspect-ratio: 16 / 10; background: #fff; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-img.contain img { object-fit: contain; padding: 6px; }
.card-body { padding: 1rem 1.1rem 1.2rem; }
.card-title { font-size: 1.15rem; font-weight: 500; margin: 0 0 0.4rem; }
.card-text { font-size: 0.92rem; color: var(--text-muted); margin: 0; }

/* ---------- Blog ---------- */
.post-list { list-style: none; margin: 0; padding: 0; }
.post-list li { padding: 1.2rem 0; }
.post-list li + li { border-top: 1px solid var(--border); }
.post-list-title { font-size: 1.3rem; font-weight: 500; color: var(--text); }
.post-list-title:hover { color: var(--accent); }
.post-list-desc { margin: 0.3rem 0; }
.post-meta { color: var(--text-muted); font-size: 0.9rem; margin: 0; }
.tag { color: var(--accent); }

.post .page-title { font-size: 2.2rem; font-weight: 400; }
.post-content h2 { margin-top: 2.2rem; font-weight: 400; }
.post-content figure { margin: 1.5rem 0; }
.post-content figcaption { color: var(--text-muted); }
.post-content pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.88rem;
}
.post-content pre code.hljs { background: transparent; padding: 0; }
.post-content code { font-size: 0.9em; }
.post-content video { max-width: 100%; }
.post-content table { border-collapse: collapse; }
.post-content th, .post-content td { border: 1px solid var(--border); padding: 0.35rem 0.6rem; }

:root[data-theme="dark"] .post-content .hljs { color: var(--text); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .post-content .hljs { color: var(--text); }
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.post-nav-item { display: flex; flex-direction: column; max-width: 48%; color: var(--text); }
.post-nav-item.next { text-align: right; margin-left: auto; }
.post-nav-item:hover { color: var(--accent); text-decoration: none; }
.post-nav-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 1.2rem 0;
  text-align: center;
}

/* ---------- Media figures (project pages, about) ---------- */
.media-figure { margin: 1.5rem 0; text-align: center; }
.media-figure img, .media-figure video { width: 100%; border-radius: 6px; display: block; margin: 0 auto; }
.media-figure.narrow img, .media-figure.narrow video { max-width: 360px; }
.media-figure figcaption { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.5rem; }

.photo-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 1rem 0 0;
}
.photo-row img { width: 100%; aspect-ratio: 3 / 4; object-fit: cover; border-radius: 6px; display: block; }
@media (max-width: 640px) {
  .photo-row { grid-template-columns: 1fr 1fr; }
  .photo-row img:last-child { display: none; }
}

.races { margin: 0 0 0.5rem; padding-left: 1.2rem; }
.races li { margin: 0.2rem 0; }