/* =====================================================================
   APRS — Seek to Segment · project page
   Light, clean academic style (inspired by fudancvl.github.io/Unison)
   ===================================================================== */
:root{
  --bg:#ffffff;
  --soft:#f5f7fa;
  --soft-2:#eef2f7;
  --ink:#1b2430;
  --ink-soft:#46535f;
  --muted:#7a8794;
  --line:#e3e8ef;
  --blue:#2563eb;
  --blue-d:#1d4ed8;
  --blue-soft:#eaf1ff;
  --cyan:#0ea5e9;
  --green:#16a34a;
  --amber:#d97706;
  --radius:16px;
  --maxw:1080px;
  --shadow:0 1px 3px rgba(16,24,40,.06), 0 8px 28px -12px rgba(16,24,40,.14);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:60px 0;border-top:1px solid var(--line)}
.section h2{font-size:1.7rem;font-weight:800;letter-spacing:-.02em;color:var(--ink)}
.section .lead{color:var(--ink-soft);margin:8px 0 28px;font-size:1.02rem;max-width:780px}
.kicker{display:inline-block;font-size:.76rem;font-weight:700;letter-spacing:.13em;text-transform:uppercase;
  color:var(--blue);margin-bottom:10px}

/* ---------- NAV ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.nav .inner{max-width:var(--maxw);margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:20px}
.nav .brand{font-weight:800;letter-spacing:-.01em;color:var(--ink);font-size:1.02rem;display:flex;align-items:center;gap:9px}
.nav .brand .mark{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;color:#fff;font-size:.8rem;
  background:linear-gradient(135deg,var(--blue),var(--cyan))}
.nav .links{margin-left:auto;display:flex;gap:22px;align-items:center}
.nav .links a{color:var(--ink-soft);font-weight:600;font-size:.92rem}
.nav .links a:hover{color:var(--blue);text-decoration:none}
.nav .gh{display:inline-flex;align-items:center;gap:6px}
.nav .gh svg{width:18px;height:18px;fill:currentColor}
@media(max-width:720px){.nav .links a:not(.gh){display:none}}

/* ---------- HERO ---------- */
.hero{text-align:center;padding:58px 0 36px}
.badges{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:22px}
.badge{display:inline-flex;align-items:center;gap:7px;font-size:.82rem;font-weight:700;
  padding:6px 14px;border-radius:999px;border:1px solid var(--line);background:var(--soft);color:var(--ink-soft)}
.badge.eccv{background:var(--blue-soft);border-color:#cfe0ff;color:var(--blue-d)}
.hero h1{font-size:2.5rem;line-height:1.14;font-weight:800;letter-spacing:-.03em;color:var(--ink);
  max-width:880px;margin:0 auto 8px}
.hero .sub{color:var(--muted);font-size:1.05rem;margin-bottom:22px}
.authors{font-size:1.06rem;margin-bottom:6px}
.authors a{font-weight:600}
.authors sup{color:var(--muted);font-weight:500}
.affil{color:var(--ink-soft);font-size:.94rem;max-width:760px;margin:2px auto}
.affil sup{color:var(--blue)}
.corr{color:var(--blue)}

.links-row{display:flex;flex-wrap:wrap;gap:11px;justify-content:center;margin-top:26px}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:.94rem;
  padding:10px 18px;border-radius:11px;background:var(--ink);color:#fff;border:1px solid var(--ink);
  transition:transform .15s ease,opacity .15s ease}
.btn:hover{transform:translateY(-2px);text-decoration:none;opacity:.92}
.btn.light{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.light:hover{border-color:var(--blue);color:var(--blue)}
.btn.soon{opacity:.55;pointer-events:none}
.btn svg{width:17px;height:17px;fill:currentColor}

/* ---------- FIGURE ---------- */
.figure{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
  max-width:860px;margin-left:auto;margin-right:auto}
.figure.wide{max-width:960px}
.figure img{width:100%;display:block}
.placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;
  min-height:280px;color:var(--muted);text-align:center;padding:36px;background:var(--soft);
  background-image:radial-gradient(var(--line) 1px,transparent 1px);background-size:18px 18px}
.placeholder .pic{font-size:2rem}
.placeholder code{font-family:'JetBrains Mono',monospace;font-size:.8rem;color:var(--blue-d);
  background:var(--blue-soft);padding:3px 8px;border-radius:6px}
.cap{color:var(--ink-soft);font-size:.9rem;padding:14px 18px;border-top:1px solid var(--line);background:#fcfdfe}
.cap b{color:var(--ink)}

/* ---------- STAT CALLOUTS ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:30px}
.stat{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-align:center}
.stat .n{font-size:1.9rem;font-weight:800;letter-spacing:-.02em;color:var(--blue-d)}
.stat .l{color:var(--ink-soft);font-size:.86rem;margin-top:3px}

/* ---------- TL;DR ---------- */
.tldr{background:var(--blue-soft);border:1px solid #cfe0ff;border-radius:var(--radius);padding:20px 24px;margin-bottom:30px;color:var(--ink-soft)}
.tldr b{color:var(--blue-d)}

/* ---------- ABSTRACT ---------- */
.prose{color:var(--ink-soft);font-size:1.03rem}
.prose p{margin-bottom:14px}
.prose b{color:var(--ink)}

/* ---------- CARDS ---------- */
.grid{display:grid;gap:18px}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card .ico{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:1.2rem;margin-bottom:12px;
  background:var(--blue-soft)}
.card h3{font-size:1.05rem;font-weight:700;margin-bottom:6px;color:var(--ink)}
.card p{color:var(--ink-soft);font-size:.94rem}
.tag{display:inline-block;font-family:'JetBrains Mono',monospace;font-size:.72rem;font-weight:600;
  padding:3px 9px;border-radius:7px;margin-bottom:8px}
.tag.ego{background:#e7f6ee;color:#15803d}
.tag.uniq{background:#e8efff;color:#1d4ed8}
.tag.allo{background:#f0ebff;color:#6d28d9}
.tag.multi{background:#fdeceb;color:#dc2626}

/* ---------- BORDERLESS LAYOUTS (replace boxy cards) ---------- */
/* step flow — method */
.flow{display:grid;grid-template-columns:repeat(3,1fr);gap:34px;margin-top:34px}
.flow .step{position:relative;padding-top:4px}
.flow .step .num{width:46px;height:46px;border-radius:50%;display:grid;place-items:center;
  font-weight:800;color:#fff;font-size:1.1rem;position:relative;z-index:1;
  background:linear-gradient(135deg,var(--blue),var(--cyan));box-shadow:0 7px 18px -7px rgba(37,99,235,.7)}
.flow .step h3{font-size:1.07rem;font-weight:700;margin:16px 0 7px;color:var(--ink)}
.flow .step p{color:var(--ink-soft);font-size:.95rem}
.flow .step:not(:last-child)::after{content:'';position:absolute;top:22px;left:58px;right:-34px;height:2px;
  background:linear-gradient(90deg,var(--cyan),rgba(14,165,233,.12));z-index:0}
@media(max-width:820px){.flow{grid-template-columns:1fr;gap:24px}.flow .step:not(:last-child)::after{display:none}}

/* feature rows — contributions */
.features{display:grid;grid-template-columns:repeat(2,1fr);gap:30px 44px;margin-top:26px}
.feature{display:flex;gap:16px}
.feature .fi{flex:0 0 auto;width:46px;height:46px;border-radius:13px;display:grid;place-items:center;
  font-size:1.3rem;background:var(--blue-soft)}
.feature h3{font-size:1.06rem;font-weight:700;margin-bottom:5px;color:var(--ink)}
.feature p{color:var(--ink-soft);font-size:.95rem}
@media(max-width:820px){.features{grid-template-columns:1fr;gap:26px}}

/* left-accent entries — expression types */
.exprs{display:grid;grid-template-columns:repeat(2,1fr);gap:22px 40px;margin-top:22px}
.expr{padding-left:18px;border-left:3px solid var(--line)}
.expr.ego{border-color:#34d399}
.expr.uniq{border-color:#2563eb}
.expr.allo{border-color:#7c3aed}
.expr.multi{border-color:#dc2626}
.expr h3{font-size:1rem;font-weight:700;margin:6px 0 5px;color:var(--ink)}
.expr p{color:var(--ink-soft);font-size:.93rem}
.expr p i{color:var(--ink)}
@media(max-width:820px){.exprs{grid-template-columns:1fr}}

/* ---------- LEADERBOARD TABLE ---------- */
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;font-size:.92rem;min-width:560px;background:#fff}
th,td{padding:11px 14px;text-align:center;border-bottom:1px solid var(--line)}
th{background:var(--soft-2);font-weight:700;color:var(--ink);font-size:.8rem;text-transform:uppercase;letter-spacing:.03em}
td:first-child,th:first-child{text-align:left}
tr.group td{background:#fbfcfe;color:var(--blue-d);font-weight:700;font-size:.8rem;text-align:left}
tr.ours td{background:var(--blue-soft);font-weight:700;color:var(--ink)}
.up{color:var(--muted);font-weight:400;font-size:.78em}
.note{color:var(--muted);font-size:.82rem;margin-top:12px}

/* ---------- INTERACTIVE DEMO ---------- */
.demo-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.demo-tab{display:inline-flex;align-items:center;gap:9px;cursor:pointer;font-weight:600;font-size:.92rem;
  padding:9px 16px;border-radius:11px;background:#fff;border:1px solid var(--line);color:var(--ink-soft);transition:.15s}
.demo-tab:hover{border-color:var(--blue)}
.demo-tab.active{background:var(--blue-soft);border-color:#aecbff;color:var(--blue-d)}
.demo-tab .tab-type{font-family:'JetBrains Mono',monospace;font-size:.66rem;font-weight:700;padding:2px 7px;border-radius:6px}
.tab-type.ego{background:#e7f6ee;color:#15803d}
.tab-type.uniq{background:#e8efff;color:#1d4ed8}
.tab-type.allo{background:#f0ebff;color:#6d28d9}
.tab-type.multi{background:#fdeceb;color:#dc2626}
.demo-stage{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);gap:18px;align-items:start}
.demo-stage>.viewer,.demo-stage>.panel{min-width:0}
.viewer{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);
  background:#0b1220;aspect-ratio:16/10;cursor:grab;user-select:none;touch-action:none;box-shadow:var(--shadow)}
.viewer.grabbing{cursor:grabbing}
.viewer canvas{width:100%;height:100%;display:block}
.hud-top{position:absolute;top:12px;left:12px;right:12px;display:flex;gap:8px;flex-wrap:wrap}
.hud-chip{display:inline-flex;align-items:center;gap:7px;font-size:.82rem;font-weight:600;
  padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.92);border:1px solid rgba(0,0,0,.06);color:var(--ink)}
.hud-chip .q{color:var(--blue-d)}
.reticle{position:absolute;top:50%;left:50%;width:42px;height:42px;transform:translate(-50%,-50%);
  border:2px solid rgba(255,255,255,.6);border-radius:50%;pointer-events:none}
.reticle::before,.reticle::after{content:'';position:absolute;background:rgba(255,255,255,.6)}
.reticle::before{left:50%;top:-9px;width:2px;height:9px;transform:translateX(-50%)}
.reticle::after{top:50%;left:-9px;height:2px;width:9px;transform:translateY(-50%)}
.hud-status{position:absolute;bottom:12px;left:12px;display:inline-flex;align-items:center;gap:8px;
  font-size:.84rem;font-weight:700;padding:8px 14px;border-radius:999px;background:rgba(255,255,255,.92);
  border:1px solid rgba(0,0,0,.06);color:var(--ink-soft);transition:.25s}
.hud-status .dot{width:9px;height:9px;border-radius:50%;background:var(--muted)}
.hud-status.searching{color:var(--blue-d);border-color:#cfe0ff}
.hud-status.searching .dot{background:var(--blue);box-shadow:0 0 10px var(--blue)}
.hud-status.found{color:var(--green);border-color:#bbf7d0;background:#f0fdf4}
.hud-status.found .dot{background:var(--green);box-shadow:0 0 12px var(--green)}
.hud-hint{position:absolute;bottom:12px;right:12px;font-size:.74rem;color:#fff;
  background:rgba(0,0,0,.35);padding:5px 10px;border-radius:8px}
.panel{display:flex;flex-direction:column;gap:14px}
.panel .box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.panel h4{font-size:.76rem;text-transform:uppercase;letter-spacing:.1em;color:var(--blue);margin-bottom:10px;font-weight:700}
.minimap{position:relative;width:100%;aspect-ratio:2/1;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.minimap canvas{width:100%;height:100%;display:block}
.mm-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px;font-size:.78rem;color:var(--ink-soft)}
.mm-legend span{display:inline-flex;align-items:center;gap:6px}
.mm-legend i{width:11px;height:11px;border-radius:3px;display:inline-block}
.demo-btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.demo-btn{flex:1;min-width:120px;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:600;font-size:.9rem;padding:11px 14px;border-radius:11px;cursor:pointer;
  background:#fff;border:1px solid var(--line);color:var(--ink);transition:.15s}
.demo-btn:hover{border-color:var(--blue);color:var(--blue)}
.demo-btn.go{background:var(--blue);border-color:var(--blue);color:#fff}
.demo-btn.go:hover{background:var(--blue-d);color:#fff}
.demo-btn:disabled,.demo-btn.locked{opacity:.4;cursor:not-allowed;background:#fff;border-color:var(--line);color:var(--ink-soft)}
.demo-btn:disabled:hover,.demo-btn.locked:hover{border-color:var(--line);color:var(--ink-soft)}
.metric-row{display:flex;justify-content:space-between;font-size:.86rem;padding:5px 0;color:var(--ink-soft)}
.metric-row b{color:var(--ink);font-variant-numeric:tabular-nums}

/* ---------- BIBTEX ---------- */
.bibtex{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:20px;overflow-x:auto;position:relative}
.bibtex pre{font-family:'JetBrains Mono',monospace;font-size:.82rem;color:var(--ink);line-height:1.6}
.copy{position:absolute;top:14px;right:14px;font-size:.78rem;padding:6px 12px;border-radius:8px;background:#fff;
  border:1px solid var(--line);color:var(--ink);cursor:pointer}
.copy:hover{border-color:var(--blue);color:var(--blue)}
footer{text-align:center;color:var(--muted);font-size:.86rem;padding:40px 0 60px;border-top:1px solid var(--line)}

@media(max-width:820px){
  .hero h1{font-size:1.85rem}
  .grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .demo-stage{grid-template-columns:1fr}
}