:root {
  --bg: #0f0f11;
  --surface: #18181f;
  --border: #2a2a38;
  --text: #e2e2e8;
  --muted: #9494b8;
  --accent: #7eb8f7;
  --accent-hover: #a8d0ff;
  --complete: #22c55e;
  --draft: #f59e0b;
  --inprogress: #60a5fa;
  --radius: 6px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

nav {
  display: flex;
  gap: 24px;
  align-items: center;
  padding: 14px 40px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}

nav a:hover { color: var(--text); }

nav a.home {
  color: var(--text);
  font-weight: 600;
  margin-right: 8px;
}

a.back {
  display: inline-block;
  margin: 24px 40px 0;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
}

a.back:hover { color: var(--text); }

.page {
  max-width: 780px;
  margin: 32px auto 80px;
  padding: 0 40px;
  width: 100%;
}

h1 { font-size: 2rem; font-weight: 700; line-height: 1.2; margin-bottom: 16px; color: var(--text); }
h2 { font-size: 1.15rem; font-weight: 600; margin: 36px 0 12px; padding-bottom: 6px; border-bottom: 1px solid var(--border); color: var(--text); }
h3 { font-size: 1rem; font-weight: 600; margin: 24px 0 8px; color: var(--text); }

p { margin-bottom: 16px; color: var(--text); }
ul, ol { margin: 0 0 16px 24px; }
li { margin-bottom: 6px; }
strong { color: var(--text); font-weight: 600; }

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

table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 0.9rem; }
th { background: var(--surface); padding: 10px 14px; text-align: left; color: var(--muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; border: 1px solid var(--border); }
td { padding: 10px 14px; border: 1px solid var(--border); vertical-align: top; }

.abstract { font-size: 1.05rem; color: var(--muted); border-left: 3px solid var(--accent); padding: 12px 20px; margin-bottom: 32px; background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0; line-height: 1.6; }
.highlight { background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent); padding: 16px 20px; border-radius: 0 var(--radius) var(--radius) 0; margin: 20px 0; font-size: 0.95rem; }
.open-q { padding: 10px 14px; border-left: 2px solid var(--draft); background: var(--surface); margin-bottom: 8px; border-radius: 0 var(--radius) var(--radius) 0; font-size: 0.9rem; color: var(--muted); }
.session-chain { background: var(--surface); border: 1px solid var(--border); padding: 14px 18px; border-radius: var(--radius); font-size: 0.85rem; color: var(--muted); margin-bottom: 28px; line-height: 1.6; }

.paper-label { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 12px; }
.paper-label span { color: var(--accent); }

.status-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 24px; font-size: 0.85rem; color: var(--muted); }
.dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.dot.complete { background: var(--complete); }
.dot.draft { background: var(--draft); }
.dot.inprogress { background: var(--inprogress); }
.status-complete { color: var(--complete); font-weight: 600; }
.status-draft { color: var(--draft); font-weight: 600; }
.status-inprogress { color: var(--inprogress); font-weight: 600; }

.crossrefs { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 0.85rem; color: var(--muted); line-height: 1.8; }
.crossrefs a { color: var(--accent); text-decoration: none; }
.crossrefs a:hover { color: var(--accent-hover); }

.hero { max-width: 780px; margin: 60px auto 48px; padding: 0 40px; }
.hero h1 { font-size: 2.4rem; margin-bottom: 16px; }
.hero .tagline { font-size: 1.1rem; color: var(--muted); margin-bottom: 32px; line-height: 1.6; }
.hero-meta { display: flex; gap: 20px; font-size: 0.85rem; color: var(--muted); flex-wrap: wrap; }

.track-section { max-width: 780px; margin: 0 auto 48px; padding: 0 40px; }
.track-label { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 8px; }
.track-section h2 { font-size: 1.3rem; margin-bottom: 20px; border: none; padding: 0; }

.paper-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 12px; }
.paper-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; text-decoration: none; display: block; transition: border-color 0.15s, background 0.15s; }
.paper-card:hover { border-color: var(--accent); background: #1e1e2e; color: var(--text); }
.paper-card-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.paper-id { font-size: 0.75rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.05em; }
.badge { font-size: 0.7rem; padding: 2px 7px; border-radius: 99px; font-weight: 600; }
.badge-complete { background: rgba(34,197,94,0.15); color: var(--complete); }
.badge-draft { background: rgba(245,158,11,0.15); color: var(--draft); }
.badge-inprogress { background: rgba(96,165,250,0.15); color: var(--inprogress); }
.badge-notstarted { background: rgba(123,123,170,0.1); color: var(--muted); }
.paper-card h3 { font-size: 0.95rem; font-weight: 600; color: var(--text); margin: 0 0 6px; }
.paper-card p { font-size: 0.82rem; color: var(--muted); margin: 0; line-height: 1.5; }

.session-list { max-width: 780px; margin: 0 auto; padding: 0 40px; }
.session-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin-bottom: 12px; text-decoration: none; display: block; transition: border-color 0.15s; }
.session-card:hover { border-color: var(--accent); }
.session-date { font-size: 0.8rem; color: var(--muted); margin-bottom: 6px; }
.session-card h3 { font-size: 1rem; color: var(--text); margin-bottom: 8px; }
.session-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.session-tag { font-size: 0.75rem; background: rgba(126,184,247,0.1); color: var(--accent); padding: 2px 8px; border-radius: 99px; }

footer { margin-top: auto; padding: 20px 40px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--muted); }
footer a { color: var(--muted); }
footer a:hover { color: var(--text); }

@media (max-width: 600px) {
  nav { padding: 12px 20px; gap: 16px; }
  .page, .hero, .track-section, .session-list { padding: 0 20px; }
  a.back { margin: 20px 20px 0; }
  h1 { font-size: 1.6rem; }
  .hero h1 { font-size: 1.8rem; }
  .paper-grid { grid-template-columns: 1fr; }
  footer { padding: 16px 20px; flex-direction: column; gap: 8px; }
}