.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap; /* prevent wrapping */
  border: 0;
}
/* styles.css: clean, slightly stylish theme with dark-mode, typography, spacing, and responsive layout */

/* Font face for local OpenSans */
@font-face {
  font-family: 'OpenSans';
  src: url('./fonts/OpenSans-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #ffffff;
  --text: #0f172a; /* slate-900 */
  --muted: #475569; /* slate-600 */
  --link: #0b68d7;
  --link-hover: #094fa6;
  --card: #f8fafc; /* slate-50 */
  --border: #e2e8f0; /* slate-200 */
  --accent: #0ea5e9; /* sky-500 */
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --link: #7cc4ff;
    --link-hover: #a8d7ff;
    --card: #0f172a;
    --border: #1f2937;
    --accent: #38bdf8;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

html, body {
  padding: 0;
  margin: 0;
}

body {
  font-family: 'OpenSans', system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Global link styles */
a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
a:hover {
  color: var(--link-hover);
  border-bottom-color: currentColor;
}

.container {
  max-width: 980px;
  padding: 24px 20px 40px;
  margin: 0 auto;
}

.site-header {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px 24px;
  align-items: center;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  box-shadow: var(--shadow);
}

.profile-image {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid rgba(14, 165, 233, 0.15); /* subtle accent ring */
}

.header-details {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.name {
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.2;
  margin: 0;
}

.title {
  font-size: 16px;
  margin: 0;
  color: var(--muted);
}

.affiliation, .email {
  margin: 0;
  color: var(--muted);
}

.links { 
  display: flex; 
  gap: 8px; 
  flex-wrap: wrap;
}
.divider { color: var(--muted); }

.content {
  margin-top: 28px;
}

.section-title {
  font-size: 18px;
  letter-spacing: 0.02em;
  margin: 22px 0 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.intro p { 
  margin: 8px 0 0;
}

.list {
  margin: 8px 0 0 18px;
}

.papers {}

.papers-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.pubtabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin: 22px 0 8px;
  padding-bottom: 6px;
  overflow-x: auto;
}

.pubtab {
  appearance: none;
  background: none;
  border: 0;
  margin: 0 16px 0 0;
  padding: 10px 4px;
  color: var(--muted);
  font-family: inherit;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.02em;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease;
}

.pubtab:hover { color: var(--text); }

.pubtab[aria-selected="true"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.pubtab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.is-hidden { display: none !important; }

/* Timeline */
.timeline { margin-top: 24px; }
.tl { 
  list-style: none; 
  margin: 8px 0 0; 
  padding: 0 0 0 28px; /* create consistent gutter for line + marker */
  position: relative; 
}
.tl::before {
  content: "";
  position: absolute;
  left: 14px; /* center of marker (12px marker => 14px line) */
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}
.tl-item { 
  position: relative; 
  padding: 0 0 22px 0; 
}
.tl-item:last-child { padding-bottom: 0; }
.tl-content {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px 12px 14px;
  margin-left: 12px; /* separation from the timeline line */
}
.tl-title { 
  margin: 0 0 2px; 
  font-size: 16px; 
}
.tl-meta { 
  margin: 0 0 8px; 
  color: var(--muted); 
  font-size: 13px; 
}
.tl-head {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 10px;
  align-items: center;
  margin-bottom: 6px;
}
.tl-logo {
  width: 36px;
  height: 36px;
  border-radius: 4px;
  object-fit: contain;
}
.tl-bullets { 
  margin: 0; 
  padding-left: 18px; 
}
.tl-bullets li { margin: 4px 0; }
.muted { color: var(--muted); }

.paper {
  display: grid;
  grid-template-columns: 1fr; /* default to single column when no thumbnail */
  grid-template-areas: "details"; /* details only by default */
  align-items: start; /* align to same top y-axis */
  gap: 16px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
}

.paper:has(.thumbnail) {
  grid-template-columns: 1fr 233px; /* 10% smaller than 259px */
  grid-template-areas: "details thumb"; /* same row when thumbnail exists */
}

.paper .paper-details { grid-area: details; text-align: left; }
.paper .thumbnail { grid-area: thumb; justify-self: end; }

.thumbnail {
  width: auto;
  max-width: 221px; /* 10% smaller than 245px */
  height: auto;
  border-radius: 8px;
  object-fit: contain; /* preserve aspect ratio without cropping */
  background: #fff;
}

.paper-title { 
  margin: 0 0 4px;
  font-size: 16px;
}
.paper-authors { 
  margin: 0 0 4px; 
  color: var(--muted);
}
.paper-source { 
  margin: 0 8px 8px 0; 
  color: var(--muted); 
  font-style: italic;
}
.paper-links { 
  margin: 0; 
}
.paper-link { 
  color: var(--link); 
  text-decoration: none; 
  border-bottom: 1px solid transparent; 
}
.paper-link:hover { 
  color: var(--link-hover); 
  border-bottom-color: currentColor; 
}

.footer {
  margin-top: 28px;
  color: var(--muted);
  font-size: 12px;
  text-align: left;
}

/* Responsive */
@media (max-width: 720px) {
  .site-header {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .header-details { align-items: center; }
  .profile-image { margin: 0 auto; }
  .paper:has(.thumbnail) {
    grid-template-columns: 1fr; 
    grid-template-areas: 
      "details"
      "thumb";
  }

  /* keep timeline line/marker aligned with consistent left gutter on mobile */
  .tl { padding-left: 28px; }
  .tl::before { left: 14px; }
}