:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #6c6c6c;
  --accent: #b509ac;
  --border: #e3e3e3;
  --card: #fafafa;
  --badge-bg: #b509ac;
  --badge-text: #ffffff;
}

/* Dark colors: follow the visitor's system setting unless they picked light with the toggle. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1c1c1d;
    --text: #e2e2e4;
    --muted: #a0a0a6;
    --accent: #2ea6cc;
    --border: #36363a;
    --card: #232326;
    --badge-bg: #2ea6cc;
    --badge-text: #111;
  }
}

:root[data-theme="dark"] {
  --bg: #1c1c1d;
  --text: #e2e2e4;
  --muted: #a0a0a6;
  --accent: #2ea6cc;
  --border: #36363a;
  --card: #232326;
  --badge-bg: #2ea6cc;
  --badge-text: #111;
}

* { box-sizing: border-box; }

html { font-size: 17px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Roboto", -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  font-weight: 300;
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
strong, b { font-weight: 500; }
img { max-width: 100%; }

h2 {
  font-weight: 400;
  font-size: 1.35rem;
  color: var(--accent);
  margin: 2.4rem 0 0.8rem;
}
h3 { font-weight: 500; font-size: 1.05rem; margin: 1.6rem 0 0.4rem; }

/* Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  min-height: 56px;
}
.nav-name { color: var(--text); font-size: 1.1rem; }
.nav-name strong { color: var(--accent); }
.nav-name:hover { text-decoration: none; }
.nav-links { list-style: none; display: flex; gap: 1.4rem; margin: 0; padding: 0; }
.nav-links a { color: var(--text); font-weight: 400; }
.nav-links a.active, .nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-links { margin-left: auto; }
.nav-toggle { display: none; }
.nav-toggle-label { display: none; }

.theme-toggle {
  background: none;
  border: none;
  padding: 4px;
  margin-left: 1.2rem;
  cursor: pointer;
  color: var(--text);
  display: flex;
}
.theme-toggle:hover { color: var(--accent); }
.theme-toggle svg { width: 20px; height: 20px; fill: currentColor; }
.icon-sun { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }

@media (max-width: 640px) {
  .nav-toggle-label {
    display: block;
    width: 28px;
    height: 20px;
    position: relative;
    cursor: pointer;
  }
  .nav-toggle-label span,
  .nav-toggle-label span::before,
  .nav-toggle-label span::after {
    position: absolute;
    left: 0;
    width: 28px;
    height: 2px;
    background: var(--text);
    content: "";
  }
  .nav-toggle-label span { top: 9px; }
  .nav-toggle-label span::before { top: -8px; }
  .nav-toggle-label span::after { top: 8px; }
  .theme-toggle { order: 1; margin-left: auto; margin-right: 1rem; }
  .nav-toggle-label { order: 2; }
  .nav-links {
    display: none;
    order: 3;
    margin-left: 0;
    flex-direction: column;
    gap: 0.4rem;
    width: 100%;
    padding: 0.4rem 0 1rem;
  }
  .nav-toggle:checked ~ .nav-links { display: flex; }
}

/* Page */
.container { max-width: 880px; margin: 0 auto; padding: 2rem 16px 3rem; }
.page-header { margin-bottom: 1.5rem; }
.page-title { font-weight: 300; font-size: 2.4rem; margin: 0; line-height: 1.2; }
.page-subtitle { color: var(--muted); margin: 0.4rem 0 0; }

/* About */
.about-title { font-weight: 300; font-size: 3rem; margin: 0; line-height: 1.15; }
.about-title strong { font-weight: 500; }
.about-subtitle { color: var(--muted); margin: 0.3rem 0 1.6rem; }
.profile { float: right; width: 34%; max-width: 260px; margin: 0 0 1rem 1.8rem; }
.profile img { width: 100%; border-radius: 6px; display: block; }
.profile-caption { font-size: 0.85rem; color: var(--muted); text-align: center; margin-top: 0.5rem; line-height: 1.5; }
.clearfix::after { content: ""; display: table; clear: both; }

@media (max-width: 640px) {
  .about-title { font-size: 2.3rem; }
  .profile { float: none; width: 60%; margin: 0 auto 1.4rem; }
}

.interests { padding-left: 1.2rem; }
.interests li { margin-bottom: 0.25rem; }

/* News */
.news { width: 100%; border-collapse: collapse; }
.news th {
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
  font-weight: 500;
  padding: 0.35rem 1.2rem 0.35rem 0;
  width: 1%;
}
.news td { padding: 0.35rem 0; }

/* Publications */
.pubs { list-style: none; padding: 0; margin: 0; }
.pub { display: flex; gap: 1.1rem; padding: 1rem 0; border-bottom: 1px solid var(--border); }
.pub:last-child { border-bottom: none; }
.pub-badge {
  flex: 0 0 92px;
  align-self: flex-start;
  background: var(--badge-bg);
  color: var(--badge-text);
  text-align: center;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.3rem 0.2rem;
  border-radius: 3px;
  margin-top: 0.2rem;
}
.pub-body { flex: 1; min-width: 0; }
.pub-title { font-weight: 500; }
.pub-authors, .pub-venue { font-size: 0.95rem; }
.pub-note { color: var(--accent); font-weight: 400; }
.pub-summary { font-size: 0.95rem; color: var(--muted); margin: 0.4rem 0 0; }
.pub-links { margin-top: 0.5rem; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.btn {
  font-size: 0.78rem;
  font-weight: 400;
  border: 1px solid var(--text);
  color: var(--text);
  padding: 0.1rem 0.6rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.year { color: var(--muted); font-weight: 300; font-size: 1.6rem; text-align: right; margin: 1.6rem 0 0; border-bottom: 1px solid var(--border); }

@media (max-width: 640px) {
  .pub { flex-direction: column; gap: 0.4rem; }
  .pub-badge { flex-basis: auto; }
}

/* Projects */
.projects { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; }
.project {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.project img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; }
.project-body { padding: 0.9rem 1rem 1rem; display: flex; flex-direction: column; flex: 1; }
.project-title { font-weight: 500; margin: 0; font-size: 1.02rem; line-height: 1.35; }
.project-meta { font-size: 0.82rem; color: var(--muted); margin: 0.2rem 0 0.6rem; }
.project-question { font-style: italic; margin: 0 0 0.5rem; font-size: 0.95rem; }
.project-summary { margin: 0; font-size: 0.93rem; }
.project .pub-links { margin-top: auto; padding-top: 0.7rem; }

/* Personal */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 0.8rem; margin: 1rem 0; }
.gallery figure { margin: 0; }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 4px; display: block; }
.gallery figcaption { font-size: 0.85rem; color: var(--muted); margin-top: 0.3rem; }

/* CV */
.cv-frame { width: 100%; height: 80vh; border: 1px solid var(--border); border-radius: 4px; }

/* Social and footer */
.social { display: flex; gap: 1.1rem; justify-content: center; margin: 2.8rem 0 0; }
.social svg { width: 28px; height: 28px; fill: var(--text); }
.social a:hover svg { fill: var(--accent); }
.site-footer {
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
  padding: 1rem 16px;
}

@media (max-width: 640px) {
  .news tr { display: block; padding: 0.3rem 0; }
  .news th, .news td { display: block; width: auto; padding: 0; }
}

.gallery.single { grid-template-columns: minmax(0, 320px); }
.gallery.single img { aspect-ratio: auto; }

/* Slideshow */
.slideshow { margin: 1rem 0; max-width: 540px; }
.slides {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  outline: none;
}
.slide { display: none; position: absolute; inset: 0; }
.slide.active { display: block; }
.slide img { width: 100%; height: 100%; object-fit: contain; display: block; }
.slide-label {
  position: absolute;
  left: 0.6rem;
  bottom: 0.6rem;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 0.82rem;
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
}
.slide-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 0 4px;
}
.slide-btn:hover { background: rgba(0, 0, 0, 0.75); }
.slide-btn.prev { left: 0.6rem; }
.slide-btn.next { right: 0.6rem; }
.slide-count {
  position: absolute;
  right: 0.6rem;
  bottom: 0.6rem;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 0.78rem;
  padding: 0.1rem 0.5rem;
  border-radius: 3px;
}
.slideshow figcaption { color: var(--muted); font-size: 0.9rem; margin-top: 0.5rem; }