/* ─────────────────────────────────────────────────────────────
   Jun Sun (孙珺) — academic homepage
   ───────────────────────────────────────────────────────────── */

:root {
  --bg:          #fdfcfa;
  --wash-a:      rgba(138,47,57,.05);
  --wash-b:      rgba(150,120,70,.045);
  --surface:     #faf8f4;
  --surface-2:   #f1ede6;
  --ink:         #17150f;
  --ink-2:       #3d3830;
  --muted:       #6e675d;
  --border:      #e9e3d9;
  --border-2:    #d9d1c3;
  --accent:      #8a2f39;
  --accent-2:    #8a2f39;
  --accent-bg:   #f6ecec;
  --cta-a:       #7a2932;
  --cta-b:       #7a2932;
  --plate:       #ffffff;
  --shadow-sm:   0 1px 2px rgba(16,22,32,.04), 0 4px 14px rgba(16,22,32,.05);
  --shadow-md:   0 2px 6px rgba(16,22,32,.06), 0 16px 40px rgba(16,22,32,.10);

  --sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --measure: 68rem;
  --radius:  18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #100e0c;
    --wash-a:      rgba(180,70,80,.12);
    --wash-b:      rgba(160,130,80,.07);
    --surface:     #17140f;
    --surface-2:   #1f1b16;
    --ink:         #ece7de;
    --ink-2:       #c9c2b5;
    --muted:       #948d80;
    --border:      #262119;
    --border-2:    #332d24;
    --accent:      #dc9096;
    --accent-2:    #dc9096;
    --accent-bg:   #2a1c1d;
    --cta-a:       #6d242c;
    --cta-b:       #6d242c;
    --plate:       #f5f2ec;
    --shadow-sm:   0 1px 2px rgba(0,0,0,.45);
    --shadow-md:   0 2px 6px rgba(0,0,0,.45), 0 16px 40px rgba(0,0,0,.5);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* soft colour wash behind the top of the page */
body::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 780px; z-index: -1;
  background:
    radial-gradient(58% 62% at 12% 0%, var(--wash-a) 0%, transparent 62%),
    radial-gradient(48% 56% at 92% 8%, var(--wash-b) 0%, transparent 60%);
  pointer-events: none;
}

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 1.75rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
p { margin: 0 0 1rem; }
strong { font-weight: 700; color: var(--ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* ── masthead ─────────────────────────────────────────────── */
.masthead { padding: 1.15rem 0; }
.masthead .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: flex; align-items: center; gap: .6rem; color: var(--ink); font-weight: 700; letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 30px; height: 30px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; font-size: .82rem; font-weight: 800;
  display: grid; place-items: center; letter-spacing: -.02em;
}
.nav { display: flex; align-items: center; gap: 1.5rem; font-size: .9rem; font-weight: 500; }
.nav a { color: var(--muted); }
.nav a:hover { color: var(--ink); text-decoration: none; }
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  border-radius: 999px; padding: .5rem 1.05rem;
  font-size: .88rem; font-weight: 600; border: 1px solid transparent;
  white-space: nowrap; transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--ink); color: var(--bg); box-shadow: var(--shadow-sm); }
.btn-primary:hover { color: var(--bg); }
.btn-ghost { border-color: var(--border-2); color: var(--ink); background: var(--bg); }
.btn-ghost:hover { color: var(--ink); border-color: var(--accent); }
.lang {
  border: 1px solid var(--border-2); border-radius: 999px;
  padding: .28rem .72rem; font-size: .78rem; font-weight: 600; color: var(--muted);
}
.lang:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* ── hero ─────────────────────────────────────────────────── */
.hero { padding: 3.25rem 0 4.5rem; display: grid; grid-template-columns: 1.3fr .7fr; gap: 3rem; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .55rem;
  font-size: .74rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 1.4rem;
}
.eyebrow::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.headline {
  font-size: clamp(2.1rem, 4.3vw, 3.15rem); line-height: 1.08; font-weight: 800;
  letter-spacing: -.035em; margin: 0 0 1.6rem;
}
.headline span { display: block; }
.headline .accent {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-bio { color: var(--ink-2); font-size: 1.02rem; max-width: 34rem; }
.hero-bio a { color: var(--ink); font-weight: 600; text-decoration: underline; text-decoration-color: var(--border-2); text-underline-offset: 3px; }
.hero-bio a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.cta { display: flex; flex-wrap: wrap; gap: .7rem; margin: 1.6rem 0 1.4rem; }
.socials { display: flex; flex-wrap: wrap; gap: .35rem 1.2rem; font-size: .88rem; }
.socials a { color: var(--muted); font-weight: 500; }
.socials a:hover { color: var(--accent); }
.socials .handle { color: var(--muted); }
.socials code, .contact-alt code, .page-head code {
  font-family: var(--mono); font-size: .92em; letter-spacing: .01em;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 5px; padding: .05rem .35rem; color: var(--ink);
}

/* portrait card */
.portrait { position: relative; justify-self: center; width: 100%; max-width: 340px; }
.portrait-frame {
  position: relative; border-radius: 26px; padding: 10px;
  background: linear-gradient(150deg, var(--accent-bg), var(--surface-2));
  box-shadow: var(--shadow-md);
}
.portrait-frame img,
.portrait-ph {
  display: block; width: 100%; aspect-ratio: 4 / 5;
  object-fit: cover; border-radius: 18px;
}
.portrait-ph {
  background: linear-gradient(150deg, var(--accent) 0%, var(--accent-2) 100%);
  display: grid; place-items: center; color: #fff;
  font-size: 3.2rem; font-weight: 800; letter-spacing: -.04em; opacity: .92;
}
.chip {
  position: absolute; display: inline-flex; align-items: center; gap: .4rem;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 999px; padding: .38rem .85rem;
  font-size: .76rem; font-weight: 600; color: var(--ink-2);
  box-shadow: var(--shadow-sm); white-space: nowrap;
}
.chip:nth-of-type(1) { top: 8%; left: -14%; }
.chip:nth-of-type(2) { bottom: 9%; right: -12%; }

/* ── sections ─────────────────────────────────────────────── */
section { padding: 3.25rem 0; scroll-margin-top: 2rem; }
.sec-head { margin-bottom: 2.25rem; }
.sec-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -.025em;
  margin: 0 0 .35rem;
}
.sec-head p { color: var(--muted); margin: 0; font-size: .98rem; max-width: 42rem; }

/* focus block */
.focus-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 2.5rem; align-items: start; }
.goal-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem 1.6rem; box-shadow: var(--shadow-sm);
}
.goal-card .label {
  font-size: .72rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: .6rem;
}
.goal-card p { margin: 0; font-size: 1.05rem; font-weight: 600; line-height: 1.55; letter-spacing: -.01em; }
.focus-text p { color: var(--ink-2); font-size: 1rem; }
.focus-text p:last-child { margin-bottom: 0; }

/* ── news ─────────────────────────────────────────────────── */
.news { list-style: none; margin: 0; padding: 0; }
.news li { display: flex; gap: 1.25rem; padding: .65rem 0; border-bottom: 1px solid var(--border); font-size: .95rem; }
.news li:last-child { border-bottom: 0; }
.news .date {
  flex: none; width: 4.6rem; color: var(--muted); font-family: var(--mono);
  font-size: .78rem; padding-top: .28rem; font-variant-numeric: tabular-nums;
}
.news .what { color: var(--ink-2); }

/* ── cards (publications / experience) ────────────────────── */
.card {
  display: grid; grid-template-columns: 120px 1fr auto; gap: 1.5rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; margin-bottom: 1rem;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.card:hover { border-color: var(--border-2); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.card .tile {
  width: 120px; height: 76px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  color: #fff; font-weight: 800; font-size: 1.1rem; letter-spacing: -.02em;
  overflow: hidden;
}
.card .tile img { width: 100%; height: 100%; object-fit: cover; }
.card .tile.soft {
  background: var(--accent-bg); color: var(--accent);
  border: 1px solid var(--border); font-size: .88rem; letter-spacing: .02em;
}
/* institution / venue logo plate — keeps every logo on the same light ground
   so dark and colourful marks stay legible in both themes */
.card .tile.logo {
  background: var(--plate); border: 1px solid var(--border);
  padding: 9px 11px;
}
.card .tile.logo img {
  width: auto; height: auto; max-width: 100%; max-height: 100%;
  object-fit: contain;
}
/* for marks that only exist as white-on-transparent */
.card .tile.logo.dark { background: #1b1b26; border-color: #1b1b26; }
.card .year {
  color: var(--muted); font-family: var(--mono); font-size: .78rem;
  font-variant-numeric: tabular-nums; white-space: nowrap; padding-top: .3rem;
}
.card h3 { margin: 0 0 .3rem; font-size: 1.05rem; font-weight: 700; letter-spacing: -.015em; line-height: 1.4; }
.card h3 a { color: var(--ink); }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.authors { font-size: .88rem; color: var(--muted); margin: 0 0 .18rem; }
.authors strong { color: var(--ink); font-weight: 700; }
.venue { font-size: .88rem; margin: 0; }
.venue em { color: var(--accent); font-style: italic; font-weight: 700; }
.venue .vlong { color: var(--muted); }
.venue .vlong::before { content: "· "; }
.blurb { font-size: .92rem; color: var(--ink-2); margin: .55rem 0 0; }
.meta { font-size: .9rem; color: var(--muted); margin: 0; }
.meta a { font-weight: 600; }
.bullets { margin: .7rem 0 0; padding-left: 1.05rem; font-size: .93rem; color: var(--ink-2); }
.bullets li { margin-bottom: .3rem; }
.bullets li::marker { color: var(--accent); }
.pill-row { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: .8rem; }
.pill {
  font-size: .78rem; font-weight: 600; border: 1px solid var(--border-2);
  border-radius: 999px; padding: .18rem .7rem; color: var(--muted); background: var(--bg);
}
.pill:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }
.badge {
  display: inline-block; font-size: .68rem; font-weight: 700; letter-spacing: .07em;
  text-transform: uppercase; background: var(--accent-bg); color: var(--accent);
  border-radius: 999px; padding: .1rem .55rem; margin-left: .5rem; vertical-align: .12em;
}
.sec-link { font-size: .9rem; font-weight: 600; }

/* compact rows (education, awards, skills) */
.rows { list-style: none; margin: 0; padding: 0; }
.rows li {
  display: grid; grid-template-columns: 11.5rem 1fr auto; gap: 1.25rem;
  padding: .85rem 0; border-bottom: 1px solid var(--border); font-size: .95rem;
}
.rows li:last-child { border-bottom: 0; }
.rows .k { color: var(--muted); font-size: .85rem; padding-top: .1rem; }
.rows.tight li { grid-template-columns: 5.5rem 1fr auto; }
.rows .k.mono { font-family: var(--mono); font-size: .78rem; font-variant-numeric: tabular-nums; }
.rows .v { color: var(--ink-2); }
.rows .v .t { color: var(--ink); font-weight: 700; display: block; }
.rows .when { color: var(--muted); font-family: var(--mono); font-size: .78rem; white-space: nowrap; padding-top: .15rem; }

/* ── contact ──────────────────────────────────────────────── */
.contact-card {
  background: linear-gradient(135deg, var(--cta-a) 0%, var(--cta-b) 100%);
  border-radius: 24px; padding: 2.5rem; color: #fff; box-shadow: var(--shadow-md);
}
.contact-card h2 { margin: 0 0 .5rem; font-size: 1.9rem; font-weight: 800; letter-spacing: -.025em; }
.contact-card p { margin: 0 0 1.4rem; opacity: .92; max-width: 40rem; }
.contact-card .contact-alt { margin: 1rem 0 0; font-size: .9rem; opacity: .9; }
.contact-card .contact-alt code {
  background: rgba(255,255,255,.16); border-color: rgba(255,255,255,.28); color: #fff;
}
.contact-card .btn-primary { background: #fff; color: #1b1630; }
.contact-card .btn-primary:hover { color: #1b1630; }

/* ── page header (publications / cv) ──────────────────────── */
.page-head { padding: 2rem 0 1rem; }
.page-head h1 { font-size: clamp(2rem, 4vw, 2.7rem); font-weight: 800; letter-spacing: -.03em; margin: 0 0 .4rem; }
.page-head p { color: var(--muted); margin: 0; }
.year-label {
  font-family: var(--mono); font-size: .8rem; font-weight: 600; color: var(--muted);
  letter-spacing: .08em; margin: 2rem 0 .9rem; display: flex; align-items: center; gap: .8rem;
}
.year-label::after { content: ""; flex: 1; height: 1px; background: var(--border); }

/* ── footer ───────────────────────────────────────────────── */
footer { border-top: 1px solid var(--border); margin-top: 2rem; padding: 1.75rem 0 3rem; font-size: .85rem; color: var(--muted); }
footer .wrap { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* ── responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 2.5rem; padding: 2rem 0 3rem; }
  .portrait { max-width: 280px; justify-self: start; }
  .chip:nth-of-type(1) { top: 6%;  left: auto; right: 5%; }
  .chip:nth-of-type(2) { bottom: 7%; right: auto; left: 5%; }
  .focus-grid { grid-template-columns: 1fr; gap: 1.5rem; }
}
@media (max-width: 680px) {
  .wrap { padding: 0 1.15rem; }
  .nav { gap: .9rem; font-size: .85rem; }
  .nav .hide-sm { display: none; }
  .headline { font-size: clamp(1.95rem, 8.5vw, 2.5rem); }
  .card { grid-template-columns: 1fr; gap: .9rem; padding: 1.2rem; }
  .card .tile { width: 84px; height: 48px; border-radius: 10px; font-size: .82rem; }
  .card .tile.logo { padding: 7px; }
  .card .year { padding-top: 0; }
  .news li { flex-direction: column; gap: .1rem; }
  .news .date { width: auto; padding-top: 0; }
  .rows li { grid-template-columns: 1fr; gap: .15rem; }
  .contact-card { padding: 1.75rem 1.5rem; border-radius: 20px; }
  .chip { font-size: .7rem; padding: .3rem .7rem; }
}

/* ── print ────────────────────────────────────────────────── */
@media print {
  .masthead, footer, .pill-row, .no-print, body::before { display: none; }
  body { font-size: 10.5pt; background: #fff; color: #000; }
  .card { break-inside: avoid; border-color: #ddd; background: #fff; }
}