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

/* ============================================================
   COLOR TOKENS — edit these to rebrand the whole site at once.
   Light theme (default). */
:root {
  --bg: #f8fcff;          /* page background */
  --surface: #ffffff;      /* card background */
  --text: #172433;         /* main text */
  --muted: #5f7082;        /* secondary text */
  --soft: #d6e8f8;         /* borders, dividers, timeline line */
  --link: #2f6fa7;         /* link color */
  --link-hover: #1687c4;   /* link hover */
  --accent: #6bbfe3;       /* card top stripe, timeline dots */
  --accent-soft: #dff3ff;
  --shadow: rgba(24, 78, 119, 0.18);
}

/* Dark theme */
[data-theme="dark"] {
  --bg: #101b27;
  --surface: #162636;
  --text: #e8f4ff;
  --muted: #a9bed2;
  --soft: #2b4358;
  --link: #9bd5ff;
  --link-hover: #73c8ef;
  --accent: #6bbfe3;
  --accent-soft: #16384b;
  --shadow: rgba(0, 0, 0, 0.5);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.18s ease;
}

a:hover {
  color: var(--link-hover);
}

/* ===== Sticky header with name + theme toggle ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom: 1px solid var(--soft);
  backdrop-filter: blur(12px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1020px, 100%);
  margin: 0 auto;
  padding: 17px 38px;
}

.site-name {
  color: var(--text);
  font-family: "DM Serif Display", Georgia, serif;
  font-size: 1.36rem;
  line-height: 1;
  text-decoration: none;
}

.site-name:hover {
  color: var(--text);
  text-decoration: none;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 7px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

.theme-toggle:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--soft) 55%, transparent);
}

.icon {
  width: 17px;
  height: 17px;
}

.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* ===== Page shell + two-column layout (portrait rail | main) ===== */
.page-shell {
  width: min(1020px, 100%);
  margin: 0 auto;
  padding: 54px 38px 78px;
}

.home-layout {
  display: flex;
  align-items: flex-start;
  gap: 56px;
}

.profile-rail {
  flex: 0 0 178px;
}

.portrait {
  display: block;
  width: 178px;
  height: 224px;
  object-fit: cover;
  object-position: center top;
  border-radius: 5px;
  box-shadow: 0 12px 28px var(--shadow);
}

/* ===== Career timeline under the portrait ===== */
.timeline {
  margin-top: 18px;
  padding-left: 6px;
}

.timeline-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 0;
  padding-left: 21px;
  padding-bottom: 13px;
}

.timeline-item::before {
  position: absolute;
  top: 9px;
  bottom: 0;
  left: 5px;
  width: 1px;
  background: var(--soft);
  content: "";
}

.timeline-item:last-child { padding-bottom: 0; }
.timeline-item:last-child::before { display: none; }

.timeline-item::after {
  position: absolute;
  z-index: 1;
  top: 4px;
  left: 0;
  width: 11px;
  height: 11px;
  border: 2px solid var(--bg);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
  content: "";
}

.timeline-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.45;
}

.timeline-item span {
  color: var(--text);
  font-weight: 650;
}

.home-main {
  flex: 1;
  min-width: 0;
}

/* ===== Bio paragraphs ===== */
.hero-bio p {
  max-width: 760px;
  margin: 0 0 15px;
  font-size: 0.96rem;
}

.ext-links {
  color: var(--muted);
  font-size: 0.9rem;
}

.ext-links a {
  color: var(--muted);
  text-decoration: none;
}

.ext-links a:hover {
  color: var(--link);
  text-decoration: underline;
}

/* ===== Selected Research: plain text publication list ===== */
.paper-deck {
  margin-top: 36px;
}

.paper-deck h2 {
  margin: 0 0 6px;
  color: var(--text);
  font-family: "DM Serif Display", Georgia, serif;
  font-size: 1.28rem;
  font-weight: 400;
  letter-spacing: 0;
}

/* The list itself */
.paper-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  max-width: 760px;
}

/* Each paper entry */
.paper-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid color-mix(in srgb, var(--soft) 70%, transparent);
}

.paper-item:last-child {
  border-bottom: 1px solid color-mix(in srgb, var(--soft) 70%, transparent);
}

/* Year column */
.paper-year {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

/* Body (title + meta + actions) */
.paper-body {
  min-width: 0;
}

/* Title */
.paper-title {
  display: block;
  margin: 0;
  color: var(--text);
  font-size: 0.98rem;
  font-weight: 650;
  line-height: 1.4;
}

/* Make a leading link cover the title so the title is clickable */
.paper-title a {
  color: inherit;
  text-decoration: none;
}

.paper-title a:hover {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Authors + venue line */
.paper-meta {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* Highlight your own name in the author list */
.paper-meta strong {
  color: var(--text);
  font-weight: 650;
}

/* Venue tag (italic, accent-tinted) */
.paper-venue {
  font-style: italic;
  color: var(--link);
}

/* Award badge — small pill next to the venue */
.paper-award {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 7px;
  font-size: 0.7rem;
  font-weight: 700;
  font-style: normal;
  letter-spacing: 0.02em;
  color: #6b3f00;
  background: linear-gradient(135deg, #ffe9a8, #ffd166);
  border-radius: 9px;
  vertical-align: 1px;
  white-space: nowrap;
}

[data-theme="dark"] .paper-award {
  color: #ffe9a8;
  background: linear-gradient(135deg, #5a4410, #7a5a18);
}

/* Optional small links after a paper (PDF / arXiv / code) */
.paper-actions {
  margin-top: 6px;
  font-size: 0.8rem;
}

.paper-actions a {
  display: inline-block;
  margin-right: 12px;
  color: var(--link);
  text-decoration: none;
}

.paper-actions a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.paper-footnote {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

/* ===== Footer ===== */
.site-footer {
  width: min(1020px, 100%);
  margin: 0 auto;
  padding: 26px 38px 34px;
  border-top: 1px solid var(--soft);
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.8rem;
}

/* ===== Responsive: stack portrait above text, 1 column ===== */
@media (max-width: 760px) {
  .topbar { padding: 14px 18px; }
  .page-shell { padding: 34px 18px 58px; }

  .home-layout {
    flex-direction: column;
    gap: 23px;
  }

  .profile-rail {
    display: grid;
    grid-template-columns: minmax(118px, 42%) 1fr;
    gap: 18px;
    width: 100%;
  }

  .portrait {
    width: 100%;
    max-width: 178px;
    height: auto;
    aspect-ratio: 4 / 5;
    justify-self: center;
  }

  .timeline { margin-top: 2px; }

  .hero-bio p {
    font-size: 0.94rem;
    overflow-wrap: break-word;
  }

  .paper-item {
    grid-template-columns: 40px 1fr;
    gap: 10px;
    padding: 13px 0;
  }

  .paper-title { font-size: 0.92rem; }
  .paper-meta { font-size: 0.82rem; }
}

@media (max-width: 420px) {
  .profile-rail {
    grid-template-columns: 44% 1fr;
    gap: 14px;
  }
  .timeline-item p { font-size: 0.72rem; }
}