/* ---- Ziyi Yin — personal homepage ---- */

:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #5c6675;
  --faint: #8b94a3;
  --accent: #2457d6;
  --accent-soft: #e8eefc;
  --border: #e3e6eb;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 4px 16px rgba(16, 24, 40, 0.06);
  --shadow-hover: 0 2px 4px rgba(16, 24, 40, 0.07), 0 10px 28px rgba(16, 24, 40, 0.12);
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1319;
    --card: #171d26;
    --text: #e6eaf0;
    --muted: #9aa4b2;
    --faint: #6d7684;
    --accent: #6f9bff;
    --accent-soft: #1d2a45;
    --border: #262e3a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-hover: 0 2px 4px rgba(0, 0, 0, 0.5), 0 10px 28px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px 64px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- header / hero ---- */

.hero {
  display: flex;
  gap: 36px;
  align-items: flex-start;
}

.hero-photo img {
  width: 250px;
  max-width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: block;
}

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

h1.name {
  margin: 0 0 2px;
  font-size: 34px;
  font-weight: 750;
  letter-spacing: -0.02em;
  font-family: "Source Serif 4", Georgia, "Times New Roman",
    "Songti SC", "SimSun", serif;
}

.name .cn { font-weight: 500; color: var(--muted); font-size: 26px; }

.tagline {
  margin: 4px 0 14px;
  color: var(--muted);
  font-size: 16px;
}
.tagline a { color: inherit; text-decoration: underline; text-decoration-color: var(--faint); }
.tagline a:hover { color: var(--accent); }

/* ---- social buttons ---- */

.socials {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 0;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 13.5px;
  font-weight: 550;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}
.social-btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
  color: var(--accent);
}
.social-btn svg { width: 15px; height: 15px; fill: currentColor; flex: none; }

/* ---- sections ---- */

section { margin-top: 44px; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-family: "Source Serif 4", Georgia, serif;
}

.see-all {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}

.about p { margin: 0 0 10px; color: var(--text); }

/* ---- publication cards (home) ---- */

.pub-card {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.pub-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }

.pub-thumb {
  flex: none;
  width: 218px;
  height: 108px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.pub-thumb img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
}

.pub-body { flex: 1; min-width: 0; }

.pub-title {
  margin: 0 0 4px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.45;
}

.pub-authors {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 13.5px;
}
.pub-authors .me { color: var(--text); font-weight: 700; }

.pub-note { color: var(--faint); font-size: 12.5px; margin: 0 0 4px; }

.pub-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
}

.venue-badge {
  display: inline-block;
  padding: 2.5px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12.5px;
  font-weight: 650;
  white-space: nowrap;
}

.link-pill {
  display: inline-block;
  padding: 2.5px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 12.5px;
  font-weight: 550;
  color: var(--accent);
  transition: border-color 0.12s ease, background 0.12s ease;
}
.link-pill:hover {
  text-decoration: none;
  border-color: var(--accent);
  background: var(--accent-soft);
}
.link-pill.disabled {
  color: var(--faint);
  pointer-events: none;
}

/* ---- all-publications page ---- */

.page-title {
  margin: 0 0 4px;
  font-size: 30px;
  font-weight: 750;
  letter-spacing: -0.02em;
  font-family: "Source Serif 4", Georgia, serif;
}

.breadcrumb { color: var(--muted); font-size: 14px; margin-bottom: 8px; }

.year-block { margin-top: 34px; }

h3.year {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-family: "Source Serif 4", Georgia, serif;
}

.pub-row {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 13px 16px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
}

.pub-row .pub-title { font-size: 15px; }

/* ---- publication group subtitles ---- */

h3.pub-group {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 17px;
  font-weight: 700;
  margin: 28px 0 12px;
  font-family: "Source Serif 4", Georgia, serif;
}
h3.pub-group::before {
  content: "";
  width: 4px;
  height: 17px;
  border-radius: 2px;
  background: var(--accent);
  flex: none;
}
.section-head + h3.pub-group { margin-top: 0; }

/* ---- work experience ---- */

.exp-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 13px 16px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
}
.exp-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.exp-org { font-weight: 700; font-size: 15.5px; }
.exp-date { color: var(--muted); font-size: 13.5px; white-space: nowrap; }
.exp-role { margin: 3px 0 0; font-size: 14px; color: var(--text); }
.exp-mentor { margin: 2px 0 0; font-size: 13px; color: var(--muted); }

/* ---- footer ---- */

footer {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--faint);
  font-size: 13px;
  text-align: center;
}

/* ---- responsive ---- */

@media (max-width: 720px) {
  .container { padding: 28px 16px 48px; }
  .hero { flex-direction: column; align-items: center; text-align: center; }
  .hero-main { text-align: center; }
  .socials { justify-content: center; }
  .hero-photo img { width: 210px; }
  .pub-card { flex-direction: column; }
  .pub-thumb { width: 100%; height: 150px; }
  .section-head { flex-direction: column; gap: 4px; }
}