/* Cover landing page + fixed sidebar layout for inner pages. */
:root {
  --bg: #ffffff;
  --fg: #1d2230;
  --muted: #5d6578;
  --line: #dde1ea;
  --accent: #3b2f8f;
  --venue: #a3317a;
  --chip-paper: #1f7a4a;
  --chip-award: #2456b8;
  --chip-internship: #7a3fa8;
  --chip-event: #8a6a12;
  --sidebar-bg: #12112b;
  --f-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --f-cover: "Source Sans 3", "Source Sans Pro", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161d;
    --fg: #e4e7ef;
    --muted: #9aa2b5;
    --line: #2a2f3c;
    --accent: #b3a9ff;
    --venue: #e07ab8;
    --chip-paper: #5fcf92;
    --chip-award: #86a9ff;
    --chip-internship: #c99bf0;
    --chip-event: #e3c264;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.6;
}
img { max-width: 100%; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- social icons (cover + sidebar) ---------- */
.social { display: flex; flex-wrap: wrap; gap: 8px; }
.social a {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: rgba(255, 255, 255, .85);
  border: 1px solid rgba(255, 255, 255, .25);
  transition: background-color .15s, color .15s;
}
.social a:hover { background: #fff; color: #1a1640; }
.social svg { width: 17px; height: 17px; fill: currentColor; }

/* ---------- cover ---------- */
.cover {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 48px 16px;
  text-align: center;
  color: #fff;
  font-family: var(--f-cover);
  background-color: #0a0f2a;
  background-position: center;
  background-size: cover;
}
.cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 8, 25, .25), rgba(5, 8, 25, .55));
}
.cover-in { position: relative; display: grid; gap: 14px; justify-items: center; max-width: 520px; }
.cover img { width: 140px; height: 140px; border-radius: 50%; object-fit: cover; border: 3px solid rgba(255, 255, 255, .85); }
.cover h1 { margin: 6px 0 0; font-size: 2.5rem; font-weight: 600; line-height: 1.2; }
.cover p { margin: 0; font-size: 1.15rem; color: rgba(255, 255, 255, .82); }
.cover nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 28px;
  margin-top: 14px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, .25);
}
.cover nav a { color: #fff; opacity: .9; text-decoration: none; font-size: 1.2rem; }
.cover nav a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
.cover .social { justify-content: center; gap: 10px; margin-top: 4px; }
.cover .social a { width: 40px; height: 40px; border-color: rgba(255, 255, 255, .3); }
.cover .social svg { width: 18px; height: 18px; }

/* ---------- sidebar layout ---------- */
/* Sidebar pinned left; the text column is centered in the space beside it. */
.layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  position: relative;
  color: #fff;
  background-color: var(--sidebar-bg);
  background-position: 30% 50%;
  background-size: cover;
}
.sidebar::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 12, 40, .55), rgba(14, 12, 40, .92) 55%);
}
.sidebar-in { position: sticky; top: 0; display: grid; gap: 16px; padding: 40px 28px; }
.avatar { width: max-content; border-radius: 50%; }
.avatar img { display: block; width: 112px; height: 112px; border-radius: 50%; object-fit: cover; border: 2px solid rgba(255, 255, 255, .8); }
.sidebar .name { font-size: 1.55rem; font-weight: 600; line-height: 1.2; }
.sidebar .role { margin: 4px 0 0; color: rgba(255, 255, 255, .78); font-size: .95rem; }
.sidebar nav { display: grid; gap: 2px; margin-top: 8px; padding-top: 14px; border-top: 1px solid rgba(255, 255, 255, .18); }
.sidebar nav a { padding: 4px 0; color: rgba(255, 255, 255, .72); text-decoration: none; }
.sidebar nav a:hover { color: #fff; }
.sidebar nav a.active { color: #fff; font-weight: 600; }
.sidebar nav a.active::before { content: "→ "; }
.sidebar .email { font-family: var(--f-mono); font-size: .78rem; color: rgba(255, 255, 255, .7); overflow-wrap: anywhere; }

.content { width: 100%; min-width: 0; max-width: 820px; margin-inline: auto; padding: 48px 48px 72px; }
.content section + section { margin-top: 40px; }
.content h2 {
  margin: 0 0 14px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
}
.content p { margin: 0 0 12px; line-height: 1.7; }
.content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  text-underline-offset: 3px;
}
.content a:hover { text-decoration-color: currentColor; }
.content .note, .content .more { color: var(--muted); font-size: .9rem; }
.content .more { margin-top: 10px; }

/* news timeline */
.timeline { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--line); }
.timeline li { position: relative; padding: 0 0 16px 20px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.timeline .meta { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: center; font-family: var(--f-mono); font-size: .8rem; color: var(--muted); }
.chip {
  padding: 0 7px;
  border: 1px solid currentColor;
  border-radius: 4px;
  font-family: var(--f-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1.7;
  text-transform: uppercase;
  white-space: nowrap;
}
.chip-paper { color: var(--chip-paper); }
.chip-award { color: var(--chip-award); }
.chip-internship { color: var(--chip-internship); }
.chip-event { color: var(--chip-event); }

/* publications + teaching rows */
.pub { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 16px; padding: 14px 0; border-top: 1px solid var(--line); }
.pub .venue { padding-top: 3px; font-family: var(--f-mono); font-size: .82rem; color: var(--venue); font-variant-numeric: tabular-nums; }
.pub .title { font-weight: 600; }
.pub .authors { color: var(--muted); font-size: .93rem; }
.pub .authors strong { color: var(--fg); }
.pub .links { display: flex; gap: 14px; margin-top: 4px; font-size: .88rem; }

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
  /* Stay positioned so the content paints above the .sidebar::before overlay. */
  .sidebar-in {
    position: relative;
    z-index: 1;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 14px 16px;
    padding: 20px 16px;
  }
  .avatar img { width: 64px; height: 64px; }
  .sidebar .name { font-size: 1.3rem; }
  .sidebar nav, .sidebar .email, .sidebar .social { grid-column: 1 / -1; }
  .sidebar nav { display: flex; flex-wrap: wrap; gap: 4px 22px; margin-top: 0; padding-top: 12px; }
  .content { padding: 28px 16px 48px; }
  .pub { grid-template-columns: 1fr; gap: 4px; }
  .cover h1 { font-size: 2rem; }
}
@media (prefers-reduced-motion: reduce) {
  .social a { transition: none; }
}