*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#f1f2f4; --card:#fff; --ink:#0b0b0d; --body:#4a4e57; --dim:#8a8f9a; --faint:#b3b7c0;
  --line:#e3e5ea; --rule:#d5d8df;
  --acc:#2d4bff; --acc2:#7b5cff; --ok:#0f9d58; --warn:#b26b00;
  --r:26px; --rs:18px;
  --sh:0 1px 2px rgba(16,18,27,.04), 0 14px 30px -14px rgba(16,18,27,.14);
  --shh:0 2px 4px rgba(16,18,27,.05), 0 26px 48px -18px rgba(16,18,27,.2);
}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink); min-height:100vh;
  font:15px/1.6 Manrope,ui-sans-serif,-apple-system,"Segoe UI",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;
}
.dots{
  position:fixed; top:0; right:0; width:46vw; height:60vh; z-index:0; pointer-events:none;
  background-image:radial-gradient(#b9bdc7 1.1px, transparent 1.1px);
  background-size:15px 15px;
  -webkit-mask-image:radial-gradient(70% 70% at 88% 8%, #000 0%, transparent 72%);
  mask-image:radial-gradient(70% 70% at 88% 8%, #000 0%, transparent 72%);
  opacity:.55;
}
main,header,footer{position:relative;z-index:1}

/* ---------- display type ---------- */
.big{
  font-weight:800; letter-spacing:-1.9px; line-height:1.0; color:var(--ink); margin:0;
  font-size:clamp(34px,5.4vw,58px);
}
.big.sm{font-size:clamp(24px,3vw,34px); letter-spacing:-1.1px}
.gl{display:inline-block; font-weight:400; font-size:.6em; transform:translateY(-.1em); color:var(--ink)}
.eyebrow{
  display:block; font-size:10px; font-weight:800; letter-spacing:1.5px; text-transform:uppercase; color:var(--dim);
}
.eyebrow.alt{color:var(--acc2)}
.ar{display:inline-block; font-weight:600}

/* ---------- header ---------- */
header{
  max-width:1280px; margin:0 auto; padding:30px 26px 0;
  display:flex; align-items:center; justify-content:space-between; gap:16px;
}
.brand{display:flex; align-items:center; gap:9px; font-size:19px; font-weight:800; letter-spacing:-.5px}
.brand em{font-style:normal; font-weight:500; color:var(--dim)}
.mark{color:var(--acc); font-size:17px; animation:spin 16s linear infinite; display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
.pill{
  padding:9px 16px; font:600 12.5px/1 Manrope,sans-serif; color:var(--ink); cursor:pointer;
  background:transparent; border:1.4px solid #cfd3da; border-radius:999px;
  display:inline-flex; align-items:center; gap:8px; transition:all .16s;
}
.pill:hover{background:var(--ink); border-color:var(--ink); color:#fff}

main{max-width:1280px; margin:0 auto; padding:0 26px 70px}

/* ---------- hero ---------- */
.hero{padding:52px 0 30px; max-width:760px}
.herosub{margin:20px 0 0; font-size:15.5px; line-height:1.62; color:var(--body); max-width:460px}

/* ---------- search ---------- */
.searchbox{max-width:820px; margin:0 0 34px}
.inputrow{display:flex; gap:10px}
#q{
  flex:1; min-width:0; padding:17px 22px; font:500 16px Manrope,sans-serif; color:var(--ink);
  background:var(--card); border:1.4px solid transparent; border-radius:999px; outline:none;
  box-shadow:var(--sh); transition:border-color .16s, box-shadow .16s;
}
#q:focus{border-color:var(--ink)}
#q::placeholder{color:var(--faint); font-weight:400}
#go{
  padding:0 24px; font:700 14px Manrope,sans-serif; color:#fff; cursor:pointer; white-space:nowrap;
  background:var(--ink); border:0; border-radius:999px; display:inline-flex; align-items:center; gap:8px;
  transition:opacity .16s, transform .1s;
}
#go:hover:not(:disabled){opacity:.85}
#go:active:not(:disabled){transform:translateY(1px)}
#go:disabled{opacity:.4; cursor:not-allowed}
.ctxrow{margin-top:10px; padding:0 4px}
#ctx{
  width:100%; padding:12px 18px; font:400 13.5px Manrope,sans-serif; color:var(--ink);
  background:transparent; border:1.4px dashed #cdd1d9; border-radius:999px; outline:none; transition:all .16s;
}
#ctx:focus{border-style:solid; border-color:var(--ink); background:var(--card)}
#ctx::placeholder{color:var(--faint)}
.examples{display:flex; flex-wrap:wrap; gap:8px; margin-top:16px; padding:0 4px}
.ex{
  padding:7px 14px; font:500 12.5px Manrope,sans-serif; color:var(--body); cursor:pointer;
  background:var(--card); border:1px solid var(--line); border-radius:999px; transition:all .15s;
}
.ex:hover{color:var(--ink); border-color:var(--ink); transform:translateY(-1px)}

/* ---------- progress ---------- */
.progress{
  max-width:820px; margin:0 0 34px; padding:24px 26px;
  background:var(--card); border-radius:var(--r); box-shadow:var(--sh);
}
.phead{display:flex; align-items:center; gap:11px; font-size:14.5px; font-weight:700}
.pulse{width:9px; height:9px; border-radius:50%; background:var(--acc); flex:0 0 auto; animation:pulse 1.5s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.3;transform:scale(.8)}}
.ptimer{margin-left:auto; font:600 12.5px ui-monospace,SFMono-Regular,Menlo,monospace; color:var(--dim)}
.steps{list-style:none; margin:18px 0 0; padding:0; display:flex; flex-direction:column; gap:9px; max-height:290px; overflow-y:auto}
.steps li{display:flex; gap:11px; align-items:flex-start; font-size:13.5px; color:var(--body); animation:slide .26s ease}
@keyframes slide{from{opacity:0;transform:translateX(-6px)}to{opacity:1;transform:none}}
.steps li .ic{flex:0 0 auto; width:19px; text-align:center}
.steps li b{color:var(--ink); font-weight:700}
.steps li .det{color:var(--dim); word-break:break-word}
.phint{margin:18px 0 0; padding-top:16px; border-top:1px solid var(--line); font-size:12px; color:var(--faint)}

/* ---------- synthesis ---------- */
.answer{padding:30px 34px; margin-bottom:44px; background:var(--card); border-radius:var(--r); box-shadow:var(--sh)}
#answer{margin:14px 0 0; font-size:17.5px; line-height:1.6; font-weight:500; letter-spacing:-.2px; max-width:76ch}
.note{margin-top:24px; padding-top:22px; border-top:1px solid var(--line)}
.note p{margin:11px 0 0; font-size:14px; line-height:1.65; color:var(--body); max-width:76ch}

/* ---------- results head ---------- */
.rhead{display:flex; align-items:flex-end; justify-content:space-between; gap:18px; flex-wrap:wrap; margin-bottom:20px}
.meta{display:flex; gap:9px; font-size:12.5px; font-weight:600; color:var(--dim); padding-bottom:5px}
.fgroup{display:flex; flex-wrap:wrap; gap:8px; margin-bottom:22px}
.kf{
  padding:7px 15px; font:600 12px Manrope,sans-serif; color:var(--body); cursor:pointer;
  background:var(--card); border:1px solid var(--line); border-radius:999px; transition:all .15s;
}
.kf:hover{color:var(--ink); border-color:#c3c8d1}
.kf.on{color:#fff; background:var(--ink); border-color:var(--ink)}

/* ---------- 3-column card grid ---------- */
.grid{display:grid; grid-template-columns:repeat(3,1fr); gap:22px; align-items:start}
@media(max-width:1020px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:660px){.grid{grid-template-columns:1fr}}

.card{
  display:flex; flex-direction:column; padding:24px; min-height:290px;
  background:var(--card); border-radius:var(--r); box-shadow:var(--sh);
  transition:transform .2s cubic-bezier(.2,.7,.3,1), box-shadow .2s;
  animation:rise .34s ease backwards;
}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.card:hover{transform:translateY(-5px); box-shadow:var(--shh)}

/* featured hero card */
.hero-img{
  position:relative; height:158px; margin:-4px 0 20px; border-radius:var(--rs); overflow:hidden;
  background:linear-gradient(135deg,#c9d6ff 0%,#e8edff 42%,#b9c8ff 100%);
  display:flex; align-items:flex-end; padding:18px;
}
.hero-img::after{
  content:""; position:absolute; inset:0;
  background:radial-gradient(120% 90% at 82% 12%, rgba(255,255,255,.75), transparent 55%);
}
.hero-img .htitle{
  position:relative; z-index:1; font-size:19px; font-weight:800; line-height:1.24; letter-spacing:-.5px; color:#16204d;
}
.hero-img .hbadge{
  position:absolute; top:14px; left:16px; z-index:1; padding:4px 10px; border-radius:999px;
  background:rgba(255,255,255,.82); font:800 9.5px Manrope,sans-serif; letter-spacing:1.2px; text-transform:uppercase; color:#2b3a6b;
}
.hero-img .hscore{
  position:absolute; top:14px; right:16px; z-index:1;
  font:700 11.5px ui-monospace,Menlo,monospace; color:#2b3a6b;
}
.card.feat .hero-img a{color:inherit; text-decoration:none}

.ceye{display:flex; align-items:center; gap:9px; margin-bottom:12px}
.kind{font:800 9.5px Manrope,sans-serif; letter-spacing:1.3px; text-transform:uppercase; color:var(--acc)}
.kind[data-k=paper]{color:var(--acc2)}
.kind[data-k=tool]{color:var(--ok)}
.kind[data-k=data]{color:var(--warn)}
.kind[data-k=discussion],.kind[data-k=video]{color:var(--dim)}
.score{margin-left:auto; font:600 11px ui-monospace,Menlo,monospace; color:var(--faint)}
.score b{color:var(--ink); font-size:12.5px}

.card h3{margin:0 0 12px; font-size:17px; line-height:1.3; font-weight:800; letter-spacing:-.4px}
.card h3 a{color:var(--ink); text-decoration:none}
.card h3 a:hover{color:var(--acc)}
.src{display:flex; align-items:center; gap:7px; font-size:11.5px; font-weight:600; color:var(--dim)}
.src .fav{width:14px; height:14px; border-radius:3px; flex:0 0 auto}
.rule{width:36px; height:2px; margin:16px 0 14px; background:var(--rule); border-radius:2px}
.sum{margin:0 0 14px; font-size:13.5px; line-height:1.68; color:var(--body)}
.why{margin:0 0 18px; font-size:12.5px; line-height:1.6; color:var(--ink)}
.why span{font-weight:800; color:var(--acc)}
.cfoot{display:flex; align-items:center; gap:10px; margin-top:auto; padding-top:16px; border-top:1px solid var(--line)}
.chip{
  width:38px; height:38px; flex:0 0 auto; border-radius:50%; background:#f0f1f4;
  display:flex; align-items:center; justify-content:center; font-size:15px; color:var(--body);
}
.tags{display:flex; flex-wrap:wrap; gap:6px}
.tag{padding:4px 9px; font:600 10.5px Manrope,sans-serif; color:var(--dim); background:#f4f5f7; border-radius:6px}

/* ---------- followups / history ---------- */
.followups{margin-top:46px; padding-top:28px; border-top:1px solid #dfe1e6}
.fchips{display:flex; flex-wrap:wrap; gap:10px; margin-top:16px}
.fu{
  padding:13px 18px; font:500 13px Manrope,sans-serif; text-align:left; color:var(--ink); cursor:pointer;
  background:var(--card); border:1px solid var(--line); border-radius:999px; transition:all .15s; max-width:100%;
}
.fu:hover{border-color:var(--ink); transform:translateY(-1px); box-shadow:var(--sh)}
.fu::after{content:" ↗"; color:var(--acc); font-weight:700}
.history{margin-top:52px; padding-top:28px; border-top:1px solid #dfe1e6}
.hlist{display:flex; flex-direction:column; gap:7px; margin-top:16px}
.hitem{
  display:flex; gap:12px; align-items:center; padding:13px 18px; font:500 13.5px Manrope,sans-serif;
  text-align:left; color:var(--body); cursor:pointer; background:transparent;
  border:1px solid transparent; border-radius:var(--rs); transition:all .15s;
}
.hitem:hover{color:var(--ink); background:var(--card); border-color:var(--line); box-shadow:var(--sh)}
.hitem .hq{flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
.hitem .hn{flex:0 0 auto; font-size:11px; font-weight:700; color:var(--faint)}

.errorbox{
  max-width:820px; margin:0 0 30px; padding:20px 24px; font-size:14px; font-weight:500;
  background:#fff4f4; border:1px solid #f3d0d0; border-radius:var(--rs); color:#a13636;
}
footer{
  max-width:1280px; margin:0 auto; padding:0 26px 44px;
  display:flex; gap:9px; flex-wrap:wrap; font-size:11.5px; font-weight:600; color:var(--faint);
}

/* ---------- modal ---------- */
.modal{position:fixed; inset:0; z-index:50; background:rgba(11,11,13,.34); display:flex; align-items:center; justify-content:center; padding:24px; animation:fade .18s ease}
@keyframes fade{from{opacity:0}to{opacity:1}}
.msheet{position:relative; max-width:520px; width:100%; padding:34px 36px; background:var(--card); border-radius:var(--r); box-shadow:var(--shh)}
.mclose{position:absolute; top:18px; right:18px; width:32px; height:32px; border:0; border-radius:50%; background:#f0f1f4; color:var(--body); font-size:13px; cursor:pointer}
.mclose:hover{background:var(--ink); color:#fff}
.mlist{margin:22px 0 0; padding-left:20px; display:flex; flex-direction:column; gap:12px; font-size:14px; line-height:1.6; color:var(--body)}
.mlist b{color:var(--ink); font-weight:800}
.mfoot{margin:22px 0 0; padding-top:18px; border-top:1px solid var(--line); font-size:12.5px; color:var(--dim)}

.hidden{display:none!important}