/* ============================================================
   Haoliang Sun — Personal Homepage
   Clean, responsive, light/dark theme. Pure static, no build.
   ============================================================ */

:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --text: #1f2a37;
  --muted: #667085;
  --border: #e4e8ee;
  --accent: #2563eb;
  --accent-2: #0ea5a4;
  --accent-soft: #e8f0fe;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 12px 28px rgba(16,24,40,.06);
  --shadow-sm: 0 1px 2px rgba(16,24,40,.06);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1120px;
  --sidebar-w: 310px;
  --nav-h: 60px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
          "PingFang SC", "Microsoft YaHei", Roboto, Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", "Songti SC", Georgia, serif;
}

[data-theme="dark"] {
  --bg: #0d1015;
  --surface: #161b22;
  --surface-2: #1d242e;
  --text: #e6eaf0;
  --muted: #9aa4b2;
  --border: #2a323d;
  --accent: #60a5fa;
  --accent-2: #2dd4bf;
  --accent-soft: #15263f;
  --shadow: 0 1px 2px rgba(0,0,0,.5), 0 12px 28px rgba(0,0,0,.4);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}

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

/* ---------- Top navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  height: 100%;
  padding: 0 22px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.nav-brand {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .2px;
  white-space: nowrap;
  color: var(--text);
}
.nav-brand:hover { text-decoration: none; }
.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
  align-items: center;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  padding: 7px 11px;
  border-radius: 8px;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.theme-toggle {
  flex: none;
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  cursor: pointer;
  color: var(--text);
  transition: background .2s, border-color .2s;
}
.theme-toggle:hover { background: var(--surface-2); }
.theme-toggle svg { width: 18px; height: 18px; }

/* ---------- Layout ---------- */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 34px 22px 60px;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  gap: 38px;
  align-items: start;
}

/* ---------- Sidebar ---------- */
.sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 34px);
}
.profile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 22px;
  text-align: center;
}
.avatar {
  width: 134px; height: 134px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--surface);
  box-shadow: 0 0 0 2px var(--accent-soft), var(--shadow-sm);
  margin: 0 auto 14px;
  display: block;
  background: var(--surface-2);
}
.profile h1 {
  font-size: 21px;
  margin: 4px 0 2px;
  font-family: var(--serif);
}
.profile .zh { color: var(--muted); font-size: 14px; margin-bottom: 8px; }
.profile .role {
  font-size: 14.5px;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 4px;
}
.profile .affil { font-size: 13.5px; color: var(--muted); margin-bottom: 14px; }
.profile .bio-mini { font-size: 13.5px; color: var(--muted); margin-bottom: 18px; text-align: left; }

.socials {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 18px;
}
.socials a {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 11px;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  transition: transform .15s, background .2s, color .2s;
}
.socials a:hover { transform: translateY(-2px); background: var(--accent); color: #fff; text-decoration: none; }
.socials svg { width: 19px; height: 19px; fill: currentColor; }

.btn-cv {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 11px;
  background: var(--accent);
  color: #fff !important;
  font-weight: 600;
  font-size: 14px;
  border: none;
  transition: filter .2s, transform .15s;
}
.btn-cv:hover { filter: brightness(1.07); transform: translateY(-1px); text-decoration: none; }
.btn-cv svg { width: 16px; height: 16px; fill: #fff; }

/* ---------- Main content ---------- */
.content { min-width: 0; }
.section {
  scroll-margin-top: calc(var(--nav-h) + 20px);
  margin-bottom: 44px;
}
.section > h2 {
  font-family: var(--serif);
  font-size: 25px;
  margin: 0 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border);
  position: relative;
}
.section > h2::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 54px; height: 2px;
  background: var(--accent);
}
.section h3.group {
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--accent-2);
  margin: 26px 0 12px;
  font-weight: 700;
}

.lead { font-size: 16.5px; margin-bottom: 16px; }
.note {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14px;
  color: var(--text);
  margin: 16px 0;
}

/* ---------- News ---------- */
.news { list-style: none; padding: 0; margin: 0; }
.news li {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--border);
}
.news li:last-child { border-bottom: none; }
.news .date {
  color: var(--accent);
  font-weight: 700;
  font-size: 13.5px;
  font-variant-numeric: tabular-nums;
  padding-top: 1px;
}
.news .txt { font-size: 15px; }

/* ---------- Publications ---------- */
.pub {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 18px;
  margin-bottom: 16px;
  position: relative;
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.pub::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(var(--accent), var(--accent-2));
  opacity: .85;
}
.pub:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.pub .badge {
  align-self: start;
  background: var(--surface-2);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  padding: 8px 6px;
  border-radius: var(--radius-sm);
  line-height: 1.25;
  border: 1px solid var(--border);
}
/* Typography is scoped to .pub-body so it is shared by BOTH the
   plain .pub list item and the .paper-box thumbnail card — the text
   formatting (bold title, highlighted <span class="me"> name, etc.)
   stays identical in both layouts. */
.pub-body { min-width: 0; }
.pub-body .pub-title { font-weight: 700; font-size: 15.5px; line-height: 1.4; }
.pub-body .pub-title a { color: var(--text); }
.pub-body .pub-title a:hover { color: var(--accent); }
.pub-body .pub-authors { font-size: 14px; color: var(--muted); margin: 4px 0; }
.pub-body .pub-authors .me { color: var(--accent); font-weight: 700; }
.pub-body .pub-venue { font-size: 13.5px; color: var(--text); opacity: .85; }
.pub-body .pub-links { margin-top: 8px; display: flex; gap: 8px; flex-wrap: wrap; }
.pub-body .pub-links a {
  font-size: 12.5px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid transparent;
}
.pub-body .pub-links a:hover { border-color: var(--accent); text-decoration: none; }

/* ---------- Paper-Box (thumbnail card) ----------
   Same visual identity as .pub — same border/shadow/hover/accent bar,
   same left-side badge, same typography via .pub-body.
   Only difference: a thumbnail column inserted between badge and text. */
.paper-box {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 18px;
  margin-bottom: 16px;
  position: relative;
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.paper-box::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(var(--accent), var(--accent-2));
  opacity: .85;
}
.paper-box:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

/* Left column: badge stacked ABOVE the thumbnail image */
.paper-box-media {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

/* Reuse the same badge look as .pub .badge, but force a single line */
.paper-box .badge {
  background: var(--surface-2);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  line-height: 1.2;
  border: 1px solid var(--border);
  white-space: nowrap;
}

/* Thumbnail image (sits below the badge) */
.paper-box-image {
  width: 100%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--surface-2);
}
.paper-box-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 5/3;
}
/* ---------- Education / generic lists ---------- */
.edu { list-style: none; padding: 0; margin: 0; }
.edu li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 16px;
}
.edu li:last-child { border-bottom: none; }
.edu .yr { font-weight: 700; color: var(--accent); font-size: 14px; }
.edu .what { font-size: 15px; }

.honors { list-style: none; padding: 0; margin: 0; }
.honors li { padding: 8px 0 8px 26px; position: relative; font-size: 15px; }
.honors li::before {
  content: "★"; color: var(--accent-2);
  position: absolute; left: 0; top: 8px;
}

.svc-group { margin-bottom: 14px; }
.svc-group h4 { margin: 0 0 6px; font-size: 15px; color: var(--text); }
.svc-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.svc-tags span {
  font-size: 13px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 11px;
  color: var(--muted);
}

.course-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.course-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
}
.course-list .ct { font-weight: 600; font-size: 15px; }
.course-list .cy { font-size: 13px; color: var(--muted); }

/* ---------- People ---------- */
.person-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.person {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  box-shadow: var(--shadow-sm);
}
.person .ini {
  flex: none;
  width: 42px; height: 42px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-weight: 700; font-size: 15px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.person .pname { font-weight: 600; font-size: 14.5px; }
.person .pmeta { font-size: 12.5px; color: var(--muted); }

/* ---------- Contact ---------- */
.contact-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}
.contact-row { display: flex; align-items: center; gap: 12px; padding: 9px 0; border-bottom: 1px dashed var(--border); font-size: 15px; }
.contact-row:last-child { border-bottom: none; }
.contact-row svg { width: 18px; height: 18px; fill: var(--accent); flex: none; }
.contact-row .k { color: var(--muted); width: 92px; flex: none; }

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  padding: 26px 22px 40px;
  border-top: 1px solid var(--border);
}
.footer a { color: var(--muted); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .wrap { grid-template-columns: 1fr; gap: 26px; padding-top: 24px; }
  .sidebar { position: static; }
  .profile { text-align: center; }
  .nav-links { display: none; }
  .course-list, .person-grid { grid-template-columns: 1fr; }
  .edu li { grid-template-columns: 1fr; gap: 2px; }
  .edu .yr { font-size: 13px; }
}
@media (max-width: 520px) {
  .pub { grid-template-columns: 1fr; }
  .pub .badge { justify-self: start; }
  .news li { grid-template-columns: 70px 1fr; gap: 10px; }
  .paper-box { grid-template-columns: 1fr; }
  .paper-box .badge { justify-self: start; }
}