/* ===== TTABC Project Page — Light Theme ===== */
:root{
  --bg:#f7f9fc;
  --bg-alt:#eef2f9;
  --surface:#ffffff;
  --surface-2:#f1f5fb;
  --line:#dde4ef;
  --text:#1a2333;
  --text-dim:#5c6b85;
  --accent:#3b6cf6;
  --accent-2:#7c5cff;
  --accent-3:#0ea88a;
  --p:#3b6cf6;   /* parameter */
  --s:#0ea88a;   /* state */
  --i:#e08600;   /* inference */
  --radius:16px;
  --maxw:1120px;
  --shadow:0 6px 24px rgba(30,50,90,.06);
  --shadow-lg:0 14px 40px rgba(30,50,90,.10);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:74px}
body{
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
.mono{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:.92em;color:var(--accent-3)}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#2a54d4}
sup{font-size:.62em}

/* ===== NAV ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(247,249,252,.8);
  backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .3s,background .3s,box-shadow .3s;
}
.nav.scrolled{border-bottom-color:var(--line);background:rgba(255,255,255,.9);box-shadow:0 2px 14px rgba(30,50,90,.05)}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-logo{font-weight:800;font-size:1.35rem;letter-spacing:-.02em;color:var(--text)}
.nav-logo span{color:var(--accent)}
.nav-links{list-style:none;display:flex;gap:26px}
.nav-links a{color:var(--text-dim);font-size:.92rem;font-weight:500}
.nav-links a:hover{color:var(--text)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.3s}

/* ===== HERO ===== */
.hero{
  position:relative;padding:150px 24px 60px;text-align:center;overflow:hidden;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(ellipse 900px 500px at 50% -10%,rgba(123,92,255,.10),transparent 60%),
    radial-gradient(ellipse 700px 400px at 20% 10%,rgba(59,108,246,.10),transparent 55%),
    linear-gradient(180deg,#fdfefe,#f7f9fc);
}
.hero-glow{
  position:absolute;top:-20%;left:50%;transform:translateX(-50%);
  width:1000px;height:600px;pointer-events:none;
  background:radial-gradient(ellipse at center,rgba(59,108,246,.10),transparent 60%);
  filter:blur(20px);
}
.hero-inner{position:relative;max-width:860px;margin:0 auto}
.badge-row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:26px}
.pill{
  font-size:.78rem;font-weight:600;padding:6px 14px;border-radius:999px;
  background:var(--surface);border:1px solid var(--line);color:var(--text-dim);box-shadow:var(--shadow);
}
.pill-accent{
  background:linear-gradient(135deg,rgba(59,108,246,.12),rgba(123,92,255,.12));
  border-color:rgba(59,108,246,.35);color:#3b52c4;
}
.hero-title{
  font-size:clamp(2.1rem,5vw,3.5rem);font-weight:800;letter-spacing:-.03em;
  line-height:1.1;margin-bottom:14px;
  background:linear-gradient(120deg,#1a2333 20%,#3b6cf6 70%,#7c5cff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.hero-sub{font-size:clamp(1.05rem,2.5vw,1.4rem);color:var(--text-dim);font-weight:500;margin-bottom:22px}
.venue{
  display:inline-flex;align-items:center;gap:8px;margin:0 auto 28px;
  padding:9px 20px;border-radius:999px;font-size:.95rem;font-weight:600;color:#3b52c4;
  background:linear-gradient(135deg,rgba(59,108,246,.12),rgba(123,92,255,.12));
  border:1px solid rgba(59,108,246,.35);box-shadow:var(--shadow);
}
.venue strong{color:var(--accent);font-weight:800}
.venue-star{color:var(--i);font-size:1.05em;line-height:1}
.authors{font-size:1.02rem;color:var(--text);margin-bottom:6px;line-height:1.9}
.affil{font-size:.92rem;color:var(--text-dim)}
.affil .note{font-size:.82rem}
.cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 22px;border-radius:12px;font-weight:600;font-size:.95rem;
  background:var(--surface);border:1px solid var(--line);color:var(--text);box-shadow:var(--shadow);
  transition:transform .18s,border-color .2s,box-shadow .2s;
}
.btn svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linejoin:round;stroke-linecap:round}
.btn:hover{transform:translateY(-2px);border-color:var(--accent);color:var(--text);box-shadow:var(--shadow-lg)}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  border-color:transparent;color:#fff;box-shadow:0 8px 24px rgba(59,108,246,.35);
}
.btn-primary:hover{color:#fff}

/* stats */
.stats{
  position:relative;max-width:840px;margin:60px auto 0;
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
}
.stat{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 12px;display:flex;flex-direction:column;gap:4px;box-shadow:var(--shadow);
}
.stat-num{font-size:2rem;font-weight:800;
  background:linear-gradient(120deg,var(--accent),var(--accent-3));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.stat-lbl{font-size:.82rem;color:var(--text-dim)}

/* ===== SECTIONS ===== */
.section{padding:88px 24px}
.section-alt{background:var(--bg-alt)}
.wrap{max-width:var(--maxw);margin:0 auto}
.kicker{
  display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);margin-bottom:14px;
}
.section h2{font-size:clamp(1.7rem,3.5vw,2.4rem);font-weight:800;letter-spacing:-.02em;margin-bottom:20px;color:var(--text)}
.section h3{font-size:1.2rem;font-weight:700;margin-bottom:10px;color:var(--text)}
.lead{font-size:1.1rem;color:var(--text-dim);max-width:760px;margin-bottom:38px}
.section p{color:var(--text-dim);margin-bottom:14px}
.section p strong{color:var(--text)}
.section p em{color:#3b52c4;font-style:normal;font-weight:600}

/* two-col */
.two-col{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.two-col-wide{grid-template-columns:1fr 1fr;align-items:start}

/* figures */
.fig{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;overflow:hidden;box-shadow:var(--shadow)}
.fig img{width:100%;height:auto;display:block;border-radius:10px;background:#fff}
.fig figcaption{font-size:.85rem;color:var(--text-dim);margin-top:12px;text-align:center}
.fig-wide{max-width:820px;margin:44px auto 0}

/* cards */
.cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:20px}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px;transition:transform .2s,border-color .2s,box-shadow .2s;box-shadow:var(--shadow);
}
.card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:var(--shadow-lg)}
.card:nth-child(1):hover{border-color:var(--p)}
.card:nth-child(2):hover{border-color:var(--s)}
.card:nth-child(3):hover{border-color:var(--i)}
.card-ico{font-size:1.8rem;margin-bottom:12px}
.card p{font-size:.95rem;margin-bottom:16px}
.tag-list{display:flex;flex-wrap:wrap;gap:6px}
.tag-list span,.tag-list a{
  font-family:'JetBrains Mono',monospace;font-size:.74rem;
  padding:3px 9px;border-radius:6px;background:var(--surface-2);
  border:1px solid var(--line);color:var(--text-dim);
  transition:background .18s,border-color .18s,color .18s,transform .18s;
}
.tag-list a{cursor:pointer}
.tag-list a:hover{
  background:rgba(59,108,246,.10);border-color:var(--accent);color:var(--accent);transform:translateY(-1px);
}
.card:nth-child(2) .tag-list a:hover{background:rgba(14,168,138,.10);border-color:var(--s);color:var(--s)}
.card:nth-child(3) .tag-list a:hover{background:rgba(224,134,0,.12);border-color:var(--i);color:var(--i)}

/* findings */
.finding{display:flex;gap:26px;padding:28px 0;border-bottom:1px solid var(--line)}
.finding:last-child{border-bottom:0}
.finding-num{
  font-size:2.4rem;font-weight:800;line-height:1;min-width:66px;
  background:linear-gradient(160deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.finding-body p{margin-bottom:0}

/* winners */
.winners{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:44px}
.winner{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;display:flex;flex-direction:column;gap:4px;box-shadow:var(--shadow);
}
.winner-shift{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim)}
.winner-name{font-size:1.05rem;font-weight:700;color:var(--text)}
.winner-ex{font-family:'JetBrains Mono',monospace;font-size:.8rem;color:var(--accent-3)}

/* tables */
.tbl-title{margin:38px 0 14px;font-size:1.1rem}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.rtable{width:100%;border-collapse:collapse;font-size:.9rem;min-width:640px;background:var(--surface)}
.rtable th,.rtable td{padding:10px 12px;text-align:center;border-bottom:1px solid var(--line)}
.rtable thead th{background:var(--surface-2);color:var(--text);font-weight:600;font-size:.82rem}
.rtable tbody tr:last-child td{border-bottom:0}
.rtable tbody tr:hover{background:rgba(59,108,246,.05)}
/* explicit alignment classes (robust to rowspan) */
.rtable .c-method{text-align:left;font-weight:500;color:var(--text)}
.rtable .c-pg{text-align:center}
.rtable .row-base .c-method{color:var(--text-dim);font-style:italic}
.rtable strong{color:var(--accent-3)}
.pg{font-weight:700;vertical-align:middle;font-size:.82rem}
.pg-p{color:var(--p)} .pg-s{color:var(--s)} .pg-i{color:var(--i)}
.note-line{font-size:.85rem;color:var(--text-dim);margin-top:16px}

/* inline citation markers + bibliography */
sup.cite{font-size:.66em;line-height:0;margin-left:1px;white-space:nowrap}
sup.cite a{color:var(--accent);text-decoration:none;font-weight:600}
sup.cite a:hover{text-decoration:underline}

.ref-list{list-style:none;max-width:880px}
.ref-list li{
  font-size:.9rem;color:var(--text-dim);line-height:1.6;
  padding:10px 0 10px 46px;position:relative;
  border-bottom:1px solid var(--line);
  scroll-margin-top:90px;
}
.ref-list li:last-child{border-bottom:0}
.ref-n{
  position:absolute;left:0;top:10px;
  font-family:'JetBrains Mono',monospace;
  font-size:.8rem;font-weight:600;color:var(--accent);
}
.ref-list a{
  color:inherit;text-decoration:none;
  border-bottom:1px dotted rgba(59,108,246,.45);
  transition:color .15s,border-color .15s;
}
.ref-list a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.ref-list a.arxiv-id{
  color:var(--accent);border-bottom:0;
  font-family:'JetBrains Mono',monospace;font-size:.92em;
}
.ref-list a.arxiv-id:hover{text-decoration:underline}

/* benchmark */
.bench-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-bottom:44px}
.bench-box{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  border-left:3px solid var(--accent);box-shadow:var(--shadow);
}
.bench-box:nth-child(2){border-left-color:var(--accent-3)}
.bench-box:nth-child(3){border-left-color:var(--i)}
.bench-box:nth-child(4){border-left-color:var(--accent-2)}
.bench-box p{font-size:.9rem;margin-bottom:0}

/* repo tree */
.repo-tree{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.repo-head{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--surface-2);border-bottom:1px solid var(--line)}
.dot{width:11px;height:11px;border-radius:50%}
.dot.r{background:#ff5f57}.dot.y{background:#febc2e}.dot.g{background:#28c840}
.repo-title{margin-left:8px;font-family:'JetBrains Mono',monospace;font-size:.85rem;color:var(--text-dim)}
.repo-tree pre{padding:20px;font-family:'JetBrains Mono',monospace;font-size:.84rem;line-height:1.75;color:var(--text);overflow-x:auto}
.repo-tree .dir{color:var(--accent)}
.repo-tree .cmt{color:var(--text-dim);font-style:italic}

/* code blocks */
.code-h{margin-bottom:12px}
.code-block{position:relative;background:#0f1626;border:1px solid #223052;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.code-block pre{padding:20px;font-family:'JetBrains Mono',monospace;font-size:.85rem;line-height:1.7;color:#dbe4f3;overflow-x:auto}
.code-block .cmt{color:#7488ab;font-style:italic}
.copy-btn{
  position:absolute;top:10px;right:10px;z-index:2;
  background:#1a2740;border:1px solid #2c3f66;color:#9fb0d0;
  font-size:.75rem;padding:5px 12px;border-radius:8px;cursor:pointer;transition:.2s;
}
.copy-btn:hover{border-color:var(--accent);color:#fff}
.copy-btn.copied{border-color:var(--accent-3);color:#43d9bb}

/* add method */
.addmethod{margin-top:44px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.steps{list-style:none;counter-reset:step;display:flex;flex-direction:column;gap:14px;margin-top:10px}
.steps li{position:relative;padding-left:42px;color:var(--text-dim);font-size:.95rem}
.steps li::before{
  counter-increment:step;content:counter(step);
  position:absolute;left:0;top:0;width:28px;height:28px;border-radius:8px;
  display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
}

/* citation ack */
.ack{margin-top:34px}
.ack p{font-size:.95rem}

/* footer */
.footer{border-top:1px solid var(--line);padding:48px 24px 28px;background:var(--bg-alt)}
.footer-inner{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:24px}
.foot-logo{font-weight:800;font-size:1.25rem}
.foot-logo span{color:var(--accent)}
.footer p{color:var(--text-dim);font-size:.9rem;margin-top:4px}
.foot-links{display:flex;gap:22px}
.foot-links a{color:var(--text-dim);font-weight:500}
.foot-links a:hover{color:var(--text)}
.copyright{text-align:center;color:var(--text-dim);font-size:.82rem;margin-top:32px}

/* reveal animation */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== RESPONSIVE ===== */
@media(max-width:900px){
  .nav-links{
    position:fixed;top:57px;right:0;width:240px;height:calc(100vh - 57px);
    flex-direction:column;gap:0;background:var(--surface);border-left:1px solid var(--line);
    padding:20px;transform:translateX(100%);transition:transform .3s;box-shadow:var(--shadow-lg);
  }
  .nav-links.open{transform:none}
  .nav-links li{width:100%;border-bottom:1px solid var(--line)}
  .nav-links a{display:block;padding:14px 4px}
  .nav-toggle{display:flex}
  .two-col,.two-col-wide{grid-template-columns:1fr;gap:28px}
  .cards-3{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .winners{grid-template-columns:repeat(2,1fr)}
  .bench-grid{grid-template-columns:1fr}
}
@media(max-width:520px){
  .section{padding:60px 18px}
  .hero{padding:120px 18px 50px}
  .stats{grid-template-columns:1fr 1fr}
  .winners{grid-template-columns:1fr}
  .finding{flex-direction:column;gap:10px}
  .footer-inner{flex-direction:column}
}