:root {
  --navy: #1F3A5F;
  --navy-deep: #16294A;
  --ink: #1f2a37;
  --body: #3f4a59;
  --muted: #7a8694;
  --line: #e7e3da;
  --bg: #fbfaf8;
  --card: #ffffff;
  --tint: #1F3A5F0d;
  --tint-strong: #1F3A5F1a;
  --maxw: 56rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }

h1, h2, h3, h4 { font-family: "Newsreader", Georgia, serif; color: var(--ink); font-weight: 600; letter-spacing: -0.01em; }
a { color: var(--navy); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- nav ---------- */
nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251,250,248,0.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { max-width: var(--maxw); margin: 0 auto; padding: 0.85rem 1.5rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.brand { font-family: "Newsreader", serif; font-weight: 600; font-size: 1.15rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.nav-links a { color: var(--body); font-size: 0.92rem; font-weight: 500; }
.nav-links a:hover { color: var(--navy); text-decoration: none; }
.nav-links a.active { color: var(--navy); font-weight: 600; }

/* ---------- hero ---------- */
header.hero { padding: 4rem 0 3rem; }
.hero-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  grid-template-rows: auto auto 1fr;
  grid-template-areas:
    "photo main"
    "meta  main"
    ".     main";
  column-gap: 2.6rem;
  row-gap: 1.3rem;
  align-items: start;
}
.hero-photo { grid-area: photo; }
.hero-main  { grid-area: main; }
.hero-meta  { grid-area: meta; display: flex; flex-direction: column; gap: 0.9rem; }
.avatar {
  width: 100%; max-width: 300px; aspect-ratio: 1 / 1; border-radius: 16px;
  background: linear-gradient(160deg, var(--navy), var(--navy-deep));
  color: #F4F1EA; display: flex; align-items: center; justify-content: center;
  font-family: "Newsreader", serif; font-size: 3.1rem; font-weight: 600;
  box-shadow: 0 10px 30px -12px rgba(31,58,95,0.5);
}
img.avatar { object-fit: cover; }
.hero h1 { font-size: 2.6rem; margin: 0 0 1.1rem; }
.hero-meta .title { color: var(--navy); font-weight: 500; font-size: 0.95rem; line-height: 1.45; margin: 0; }
.hero-meta .market-badge {
  margin: 0; display: block; background: none; border: 0; border-radius: 0; padding: 0;
  font-size: 0.92rem; font-weight: 600; color: var(--navy); line-height: 1.5;
}
.hero-meta .market-badge::before { display: inline-block; margin-right: 0.5rem; vertical-align: middle; }
.hero-meta .contact-line { margin: 0; font-size: 0.92rem; line-height: 1.8; }
.hero-meta .lbl { color: var(--muted); }
.hero p { margin: 0 0 0.9rem; max-width: 38rem; }
.market-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--tint); color: var(--navy); border: 1px solid var(--tint-strong);
  border-radius: 999px; padding: 0.35rem 0.9rem; font-size: 0.86rem; font-weight: 600;
  margin-top: 0.4rem;
}
.market-badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #2f9e6f; }

.contact-line { margin-top: 1.3rem; font-size: 0.98rem; color: var(--body); }

.links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.4rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.45rem;
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  padding: 0.5rem 0.95rem; border-radius: 8px; font-size: 0.9rem; font-weight: 500;
  transition: border-color .15s, color .15s, background .15s;
}
.btn:hover { border-color: var(--navy); color: var(--navy); text-decoration: none; background: var(--tint); }
.btn svg { width: 16px; height: 16px; stroke: currentColor; }

.tags { margin-top: 1.6rem; }
.tags .label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); font-weight: 600; }
.tag-row { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.4rem 0 0.9rem; }
.tag { font-size: 0.83rem; color: var(--navy); background: var(--tint); border: 1px solid var(--tint-strong); border-radius: 6px; padding: 0.18rem 0.6rem; }

/* ---------- sections ---------- */
section { padding: 2.6rem 0; border-top: 1px solid var(--line); scroll-margin-top: 4.5rem; }
section.first { border-top: none; padding-top: 2.8rem; }
section h2 { font-size: 1.6rem; margin: 0 0 1.5rem; }
section h2 .hash, .page-title .hash { color: var(--navy); opacity: 0.45; font-weight: 400; margin-right: 0.4rem; }
.page-title { font-size: 2.1rem; margin: 0 0 1.6rem; }

.subhead { font-family: "Newsreader", Georgia, serif; font-size: 1.5rem; font-weight: 600; color: var(--ink); letter-spacing: -0.01em; margin: 2.4rem 0 1.1rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--line); }
.paper-num { flex: none; min-width: 1.6rem; color: var(--navy); font-weight: 700; font-family: "Newsreader", Georgia, serif; font-size: 1.12rem; }

.paper { display: flex; align-items: baseline; gap: 0.5rem; margin-bottom: 1.5rem; }
.paper-body { flex: 1; min-width: 0; }
.paper.jmp {
  background: var(--tint); border: 1px solid var(--tint-strong);
  border-left: 3px solid var(--navy); border-radius: 0 10px 10px 0;
  padding: 1.1rem 1.3rem; margin-bottom: 1.8rem;
}
.paper .jmp-flag { display: inline-block; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; color: var(--navy); margin-bottom: 0.35rem; }
.paper-title { font-family: "Newsreader", serif; font-weight: 600; font-size: 1.12rem; color: var(--ink); margin: 0 0 0.2rem; line-height: 1.35; }
.paper-meta { font-size: 0.95rem; color: var(--body); margin: 0; }
.paper-meta .status { color: var(--muted); font-style: italic; }
.paper-meta .me { font-weight: 600; color: var(--ink); }
.paper-note { color: var(--muted); font-style: italic; }
.paper-actions { display: flex; align-items: baseline; gap: 0.85rem; flex-wrap: wrap; margin-top: 0.55rem; }
.abs-toggle, .paper-link {
  background: none; border: 0; padding: 0; margin: 0; cursor: pointer;
  color: var(--navy); font-family: "Inter", sans-serif; font-size: 0.85rem; font-weight: 500;
}
.abs-toggle::before, .paper-link::before { content: "["; color: var(--muted); }
.abs-toggle::after,  .paper-link::after  { content: "]"; color: var(--muted); }
.abs-toggle:hover, .paper-link:hover { text-decoration: underline; }
.abstract { margin-top: 0.6rem; font-size: 0.95rem; color: var(--body); background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 0.9rem 1.1rem; }
.paper.jmp .abstract { background: rgba(255,255,255,0.6); }

ul.clean { list-style: none; padding: 0; margin: 0; }
ul.clean li { margin-bottom: 1rem; }
.entry-title { color: var(--ink); font-weight: 500; }
.entry-sub { font-size: 0.93rem; color: var(--muted); }
.row { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; }
.row .date { flex: none; color: var(--muted); font-size: 0.9rem; }

.teach-org { color: var(--muted); font-size: 0.95rem; margin: 1.6rem 0 0.7rem; }
.teach-org:first-of-type { margin-top: 0; }

.contact-card p { margin: 0 0 0.6rem; }

footer { border-top: 1px solid var(--line); padding: 2rem 0 2.5rem; color: var(--muted); font-size: 0.85rem; text-align: center; }

@media (max-width: 640px) {
  header.hero { padding: 2.5rem 0 2rem; }
  .hero-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    grid-template-areas:
      "photo"
      "main"
      "meta";
    row-gap: 1.5rem;
  }
  .avatar { max-width: 200px; font-size: 2.2rem; }
  .hero h1 { font-size: 2rem; }
  body { font-size: 16px; }
  .row { flex-direction: column; gap: 0.1rem; }
}