/* =====================================================================
   ASI Lab — per-paper landing pages
   /papers/papers.css — used by every /papers/<slug>/index.html.
   Pairs with /common.css (chrome). Matches ASI design tokens.
   ===================================================================== */
:root {
  --cityu: #6b2c91; --cityu-dark: #4a1e66; --accent: #0f8f8f; --accent2: #38b2b2;
  --energy: #38d5c8; --ink: #14202e; --muted: #5b6673; --bg: #f7f9fb;
  --card: #ffffff; --border: #e4e9ef; --radius: 14px; --radius-lg: 18px;
  --shadow: 0 10px 30px rgba(20,32,46,.08); --max: 1160px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
  "Helvetica Neue", Arial, "PingFang HK", sans-serif; color: var(--ink);
  background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
img { max-width: 100%; display: block; }
.skip-link { position: absolute; left:-999px; top:0; z-index:999; background: var(--cityu);
  color:#fff; padding:10px 16px; border-radius:0 0 8px 0; font-weight:600; }
.skip-link:focus { left:0; color:#fff; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius:4px; }

/* Hero */
.paper-hero { position: relative; overflow: hidden; color:#fff;
  background:
    radial-gradient(1100px 460px at 18% -10%, rgba(56,213,200,.2), transparent 60%),
    radial-gradient(900px 460px at 92% 4%, rgba(107,44,145,.6), transparent 66%),
    linear-gradient(150deg, #2a1140 0%, #3d1c63 45%, #12508f 100%);
  padding: 48px 0 52px; }
.crumb { font-size:.78rem; letter-spacing:1px; text-transform:uppercase; font-weight:700;
  color:#b8b0c9; margin-bottom:16px; }
.crumb a { color:#b8f0f0; }
.ptype { display:inline-block; font-size:.68rem; letter-spacing:.06em; text-transform:uppercase;
  font-weight:800; color:#fff; background:rgba(255,255,255,.18); border:1px solid rgba(255,255,255,.3);
  padding:3px 11px; border-radius:999px; margin-bottom:14px; }
.paper-hero h1 { font-size: clamp(1.5rem, 3.6vw, 2.3rem); line-height:1.2; font-weight:800;
  letter-spacing:-.3px; margin-bottom:14px; }
.paper-hero .authors { font-size:1rem; color:#d9e8ff; margin-bottom:14px; }
.paper-hero .authors a { color:#8ff0e8; font-weight:600; }
.paper-hero .authors a:hover { text-decoration:underline; }
.meta-row { display:flex; flex-wrap:wrap; gap:8px 20px; font-size:.9rem; color:#b8f0f0; }
.meta-row .venue { font-weight:600; }
.meta-row .doi a { color:#b8f0f0; }

/* Body */
.paper-body { padding: 44px 0 56px; }
.paper-grid { display:grid; grid-template-columns: 1fr 300px; gap:40px; }
@media (max-width: 900px) { .paper-grid { grid-template-columns:1fr; } }
.paper-main h2 { font-size:1.2rem; font-weight:800; color:var(--cityu); margin:30px 0 10px; }
.actions { display:flex; flex-wrap:wrap; gap:10px; }
.pill-btn { display:inline-flex; align-items:center; gap:7px; font-weight:700; font-size:.9rem;
  padding:11px 18px; border-radius:999px; text-decoration:none; transition:transform .16s, background .16s; }
.pill-btn:hover { text-decoration:none; transform:translateY(-2px); }
.pill-btn.solid { background:var(--cityu); color:#fff; box-shadow:0 8px 20px rgba(107,44,145,.28); }
.pill-btn.solid:hover { background:var(--cityu-dark); }
.pill-btn.ghost { color:var(--accent); border:2px solid #bfe6e4; background:#f3fbfa; }
.pill-btn.ghost:hover { border-color:var(--accent); }
.abstract { color:var(--muted); font-size:1rem; line-height:1.7; }
.topics { display:flex; flex-wrap:wrap; gap:7px; }
.pill { font-size:.78rem; font-weight:600; color:var(--cityu-dark); background:#f1e8f8;
  border:1px solid #e6d8f1; padding:5px 11px; border-radius:999px; }
a.pill:hover { background:var(--cityu); color:#fff; border-color:var(--cityu); text-decoration:none; }

/* Sidebar */
.paper-side .side-card { background:var(--card); border:1px solid var(--border);
  border-radius:var(--radius); box-shadow:var(--shadow); padding:22px; margin-bottom:18px; }
.paper-side h3 { font-size:.78rem; letter-spacing:1.2px; text-transform:uppercase; font-weight:800;
  color:var(--cityu); margin-bottom:14px; }
.paper-side dl { display:grid; grid-template-columns:auto 1fr; gap:10px 14px; font-size:.9rem; }
.paper-side dt { color:var(--muted); }
.paper-side dd { font-weight:600; word-break:break-word; }
.paper-side .side-card p { color:var(--muted); font-size:.88rem; margin-bottom:12px; }

/* ---------- Papers index page ---------- */
.papers-hero { position:relative; overflow:hidden; color:#fff;
  background:
    radial-gradient(1100px 460px at 18% -10%, rgba(56,213,200,.2), transparent 60%),
    radial-gradient(900px 460px at 92% 4%, rgba(107,44,145,.6), transparent 66%),
    linear-gradient(150deg, #2a1140 0%, #3d1c63 45%, #12508f 100%);
  padding: 56px 0 48px; }
.papers-hero h1 { font-size: clamp(1.8rem, 4.4vw, 2.7rem); font-weight:800; letter-spacing:-.4px; margin-bottom:10px; }
.papers-hero h1 span { color: var(--energy); }
.hero-sub { font-size:1.02rem; opacity:.92; max-width:760px; }
.topic-strip { display:flex; flex-wrap:wrap; gap:8px; margin-top:24px; }
.topic-strip .pill { color:#fff; background:rgba(255,255,255,.14); border:1px solid rgba(255,255,255,.28); }
.topic-strip .pill:hover { background:var(--energy); color:var(--cityu-dark); border-color:var(--energy); }
.topic-strip .pill .cnt { opacity:.8; }

.papers-list { padding: 44px 0 60px; }
.yr-block { margin-bottom:38px; }
.yr-block h2 { font-size:1.4rem; font-weight:800; color:var(--cityu); display:flex; align-items:center; gap:10px; margin-bottom:16px; }
.yr-block h2 .cnt { font-size:.8rem; font-weight:700; color:#fff; background:var(--accent); padding:2px 10px; border-radius:999px; }
.plist { list-style:none; }
.prow { display:block; padding:14px 16px; margin-bottom:10px; background:var(--card);
  border:1px solid var(--border); border-radius:var(--radius); text-decoration:none; color:inherit;
  transition:transform .15s, box-shadow .15s, border-color .15s; }
.prow:hover { text-decoration:none; transform:translateY(-2px); box-shadow:var(--shadow); border-color:#c4d7e2; }
.ptitle { display:block; font-weight:700; color:var(--ink); line-height:1.35; }
.prow:hover .ptitle { color:var(--cityu); }
.pauth { display:block; font-size:.85rem; color:var(--muted); margin-top:4px; }
.pven { display:block; font-size:.8rem; color:#3d4a59; margin-top:4px; font-weight:600; }
.ptopics { display:flex; flex-wrap:wrap; gap:5px; margin-top:8px; }
.ptopics .ptopic { font-size:.68rem; font-weight:600; color:var(--cityu-dark);
  background:#f1e8f8; border:1px solid #e6d8f1; padding:2px 8px; border-radius:999px; }