/* ==========================================================================
   Physical AI Meetup — site styles
   Design tokens lifted from the live physicalaimeetup.com build so this page
   sits inside the same system: Syne display, Inter body, JetBrains Mono labels,
   cyan #00C8D7 / purple #7040C8 on navy.
   ========================================================================== */

:root{
  /* brand */
  --pai-cyan-100:#B3F0F5; --pai-cyan-200:#66E0EA; --pai-cyan-400:#00C8D7;
  --pai-cyan-600:#009EAC;
  --pai-purple-100:#C9B3F0; --pai-purple-200:#9B7ADE; --pai-purple-400:#7040C8;
  --pai-accent:var(--pai-cyan-400);
  --pai-accent-hi:#00DFEE;
  --pai-accent-secondary:var(--pai-purple-400);
  --pai-accent-secondary-hi:#9060E8;

  /* surfaces */
  --pai-navy-850:#080E1A; --pai-navy-800:#0D1829; --pai-navy-900:#040A12;
  --pai-navy-card:#111E2D; --pai-navy-700:#1A2A3D;
  --pai-bg:var(--pai-navy-850);
  --pai-surface-card:var(--pai-navy-card);
  --pai-surface-overlay:rgba(8,14,26,0.85);
  --pai-border:var(--pai-navy-700);
  --pai-border-strong:#1A3550;

  /* text */
  --pai-white:#FFFFFF; --pai-navy-200:#8FA8C0; --pai-navy-400:#4B6880;
  --pai-text-primary:var(--pai-white);
  --pai-text-secondary:var(--pai-navy-200);
  --pai-text-tertiary:var(--pai-navy-400);

  /* circuit background */
  --pai-circuit-trace:rgba(0,200,215,0.07);
  --pai-circuit-via:rgba(0,200,215,0.28);

  /* type */
  --pai-font-display:'Syne', system-ui, sans-serif;
  --pai-font-body:'Inter', system-ui, -apple-system, sans-serif;
  --pai-font-mono:'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --pai-tracking-label:0.12em; --pai-tracking-widest:0.16em; --pai-tracking-city:0.18em;

  /* shape */
  --pai-radius-sm:3px; --pai-radius-md:6px; --pai-radius-lg:10px; --pai-radius-pill:999px;
  --pai-border-default:1.5px;
  --maxw:1176px;
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  background:var(--pai-bg);
  color:var(--pai-text-primary);
  font-family:var(--pai-font-body);
  font-size:16px;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;}
img,svg{display:block;max-width:100%;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
section{position:relative;padding:104px 0;}
@media (max-width:640px){section{padding:72px 0;}}

/* ---------- type ---------- */
h1,h2,h3{font-family:var(--pai-font-display);font-weight:700;line-height:1.2;}
h2{font-size:clamp(28px,3.6vw,44px);letter-spacing:-0.01em;margin-bottom:16px;}
h3{font-size:18px;font-weight:600;}
p{color:var(--pai-text-secondary);line-height:1.65;}

.eyebrow{
  display:block;font-family:var(--pai-font-mono);font-size:11px;font-weight:500;
  letter-spacing:var(--pai-tracking-label);text-transform:uppercase;
  color:var(--pai-accent);margin-bottom:14px;
}
.lead{color:var(--pai-text-secondary);font-size:18px;max-width:660px;}
.section-head{max-width:720px;margin-bottom:48px;}

/* ---------- circuit background ---------- */
.circuit{position:fixed;inset:0;z-index:-1;pointer-events:none;overflow:hidden;}
.circuit::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(var(--pai-circuit-trace) 1px, transparent 1px),
    linear-gradient(90deg, var(--pai-circuit-trace) 1px, transparent 1px);
  background-size:88px 88px;
  -webkit-mask-image:radial-gradient(ellipse 90% 55% at 50% 0%, #000 30%, transparent 100%);
  mask-image:radial-gradient(ellipse 90% 55% at 50% 0%, #000 30%, transparent 100%);
}
.circuit::after{
  content:"";position:absolute;top:-260px;left:50%;transform:translateX(-50%);
  width:1100px;max-width:140%;height:720px;
  background:
    radial-gradient(circle at 38% 42%, rgba(0,200,215,0.14) 0%, transparent 58%),
    radial-gradient(circle at 66% 38%, rgba(112,64,200,0.13) 0%, transparent 60%);
  filter:blur(46px);
}
.circuit svg{position:absolute;inset:0;width:100%;height:100%;}

/* ---------- header ---------- */
header{
  position:sticky;top:0;z-index:60;
  background:var(--pai-surface-overlay);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--pai-border);
}
nav{display:flex;align-items:center;justify-content:space-between;gap:20px;
    max-width:var(--maxw);margin:0 auto;padding:14px 24px;}
.brand{display:flex;align-items:center;gap:11px;}
.brand img{height:26px;width:auto;}
.brand-name{font-family:var(--pai-font-display);font-weight:700;font-size:17px;letter-spacing:-0.01em;}
.nav-links{display:flex;gap:30px;font-size:14px;color:var(--pai-text-secondary);}
.nav-links a{transition:color 120ms;}
.nav-links a:hover{color:var(--pai-accent);}
@media (max-width:860px){.nav-links{display:none;}}
@media (max-width:430px){
  header .brand-name{display:none;}   /* logo alone — keeps the bar on one line */
  nav{padding:12px 18px;}
}

/* ---------- buttons ---------- */
.btn{
  font-family:var(--pai-font-body);font-weight:600;font-size:15px;
  letter-spacing:0.06em;text-transform:uppercase;line-height:1;white-space:nowrap;
  padding:15px 28px;display:inline-flex;align-items:center;justify-content:center;gap:10px;
  border-radius:var(--pai-radius-md);border:var(--pai-border-default) solid transparent;
  cursor:pointer;transition:background 120ms,border-color 120ms,color 120ms,transform 80ms;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--pai-accent);color:var(--pai-navy-850);}
.btn-primary:hover{background:var(--pai-accent-hi);}
.btn-outline{background:transparent;color:var(--pai-accent);border-color:var(--pai-accent);}
.btn-outline:hover{background:rgba(0,200,215,0.08);}
.btn-quiet{background:transparent;color:var(--pai-text-primary);border-color:var(--pai-border-strong);}
.btn-quiet:hover{border-color:var(--pai-accent);color:var(--pai-accent);}
.btn-sm{font-size:12px;padding:11px 18px;letter-spacing:0.08em;}

/* ---------- hero ---------- */
.hero{padding-top:72px;padding-bottom:88px;text-align:center;}
.wordmark{
  font-family:var(--pai-font-display);font-weight:700;
  font-size:clamp(40px,6.2vw,84px);line-height:1.0;letter-spacing:0.03em;
  text-transform:uppercase;margin-bottom:28px;
}
.wordmark span{display:block;}
.wordmark .w-physical{color:var(--pai-accent);}
.wordmark .w-ai{color:var(--pai-purple-200);}
.wordmark .w-meetup{color:var(--pai-white);}
.hero-tagline{
  font-family:var(--pai-font-body);font-weight:700;letter-spacing:-0.02em;
  font-size:clamp(21px,2.6vw,32px);line-height:1.3;margin-bottom:24px;
}
.hero-tagline .accent{color:var(--pai-accent);display:block;}
.hero p.lead{margin:0 auto 34px;text-align:center;}
.hero-ctas{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:56px;}

.hero-figure{
  position:relative;border:var(--pai-border-default) solid var(--pai-border);
  border-radius:var(--pai-radius-lg);overflow:hidden;margin-bottom:56px;
  box-shadow:0 40px 90px -50px rgba(0,200,215,0.4);
}
.hero-figure img{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;}
.hero-figure::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(to top, rgba(8,14,26,0.55) 0%, transparent 45%);
}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;}
.stat{
  position:relative;background:var(--pai-surface-card);
  border:var(--pai-border-default) solid var(--pai-border);
  border-radius:var(--pai-radius-lg);padding:26px 14px 22px;text-align:center;overflow:hidden;
}
.stat::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--pai-accent);}
.stat:nth-child(even)::before{background:var(--pai-accent-secondary);}
.stat .num{font-family:var(--pai-font-display);font-weight:700;font-size:clamp(30px,3.4vw,44px);
           line-height:1;letter-spacing:0.01em;}
.stat:nth-child(even) .num{color:var(--pai-purple-200);}
.stat .label{font-family:var(--pai-font-mono);font-size:10px;font-weight:500;
             letter-spacing:var(--pai-tracking-label);text-transform:uppercase;
             color:var(--pai-text-secondary);margin-top:10px;}
@media (max-width:900px){.stats{grid-template-columns:repeat(3,1fr);}}
@media (max-width:560px){.stats{grid-template-columns:repeat(2,1fr);}
  .stats .stat:last-child{grid-column:span 2;}}

/* ---------- generic cards ---------- */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
@media (max-width:980px){.grid-4{grid-template-columns:repeat(2,1fr);}}
@media (max-width:860px){.grid-3{grid-template-columns:1fr;}}
@media (max-width:560px){.grid-4{grid-template-columns:1fr;}}

.card{
  position:relative;background:var(--pai-surface-card);
  border:var(--pai-border-default) solid var(--pai-border);
  border-radius:var(--pai-radius-lg);padding:28px 24px;overflow:hidden;
  transition:border-color 140ms,transform 140ms;
}
.card:hover{border-color:var(--pai-border-strong);transform:translateY(-2px);}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--pai-accent) 0%, transparent 100%);
}
.card:nth-child(even)::before{
  background:linear-gradient(90deg,var(--pai-accent-secondary) 0%, transparent 100%);
}
.card .icon{width:26px;height:26px;stroke:var(--pai-accent);fill:none;
            stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;margin-bottom:18px;}
.card:nth-child(even) .icon{stroke:var(--pai-purple-200);}
.card h3{margin-bottom:10px;}
.card p{font-size:14px;}

/* ---------- market banner ---------- */
.market{
  display:flex;gap:34px;align-items:center;flex-wrap:wrap;margin-top:32px;
  background:var(--pai-surface-card);border:var(--pai-border-default) solid var(--pai-border);
  border-left:4px solid var(--pai-accent-secondary);
  border-radius:var(--pai-radius-lg);padding:32px 36px;
}
.market .figure{font-family:var(--pai-font-display);font-weight:700;font-size:clamp(34px,4.4vw,52px);
                color:var(--pai-purple-200);line-height:1;letter-spacing:0.01em;}
.market .body{flex:1 1 420px;}
.market .body strong{color:var(--pai-text-primary);font-weight:600;}
.market .src{font-family:var(--pai-font-mono);font-size:11px;line-height:1.6;
             color:var(--pai-text-tertiary);margin-top:12px;}
.market .src a{color:var(--pai-text-secondary);text-decoration:underline;text-underline-offset:2px;}
.market .src a:hover{color:var(--pai-accent);}

/* ---------- chapters ---------- */
.chapters{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
@media (max-width:980px){.chapters{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.chapters{grid-template-columns:1fr;}}
.chapter{
  background:var(--pai-surface-card);border:var(--pai-border-default) solid var(--pai-border);
  border-radius:var(--pai-radius-lg);padding:26px 22px;display:flex;flex-direction:column;gap:14px;
  transition:border-color 140ms;
}
.chapter:hover{border-color:var(--pai-border-strong);}
.chapter.soon{opacity:0.62;}
.chapter .city{font-family:var(--pai-font-display);font-weight:700;font-size:21px;}
.badge{
  align-self:flex-start;font-family:var(--pai-font-body);font-weight:600;font-size:11px;
  letter-spacing:var(--pai-tracking-label);text-transform:uppercase;
  color:var(--pai-accent);background:rgba(0,200,215,0.07);
  border:var(--pai-border-default) solid rgba(0,200,215,0.4);
  border-radius:var(--pai-radius-sm);padding:5px 10px;
}
.badge.grey{color:var(--pai-text-tertiary);background:rgba(143,168,192,0.06);
            border-color:rgba(143,168,192,0.28);}
.chapter p{font-size:14px;flex-grow:1;}
.chapter .btn{width:100%;font-size:13px;padding:13px 16px;letter-spacing:0.04em;text-transform:none;
              justify-content:space-between;}

.chapter-ctas{display:flex;flex-direction:column;align-items:center;gap:14px;margin-top:44px;}

/* ---------- gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
@media (max-width:860px){.gallery{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.gallery{grid-template-columns:1fr;}}
.gallery figure{
  position:relative;border:var(--pai-border-default) solid var(--pai-border);
  border-radius:var(--pai-radius-lg);overflow:hidden;background:var(--pai-surface-card);
}
.gallery img{width:100%;height:auto;aspect-ratio:3/2;object-fit:cover;
             transition:transform 300ms ease;}
.gallery figure:hover img{transform:scale(1.03);}
.gallery figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:22px 18px 14px;
  font-family:var(--pai-font-mono);font-size:11px;letter-spacing:var(--pai-tracking-label);
  text-transform:uppercase;color:var(--pai-white);
  background:linear-gradient(to top, rgba(4,10,18,0.92) 0%, transparent 100%);
}

/* ---------- sponsor wall ---------- */
.sponsors{margin-top:64px;text-align:center;}
.sponsors .kicker{
  font-family:var(--pai-font-mono);font-size:11px;letter-spacing:var(--pai-tracking-label);
  text-transform:uppercase;color:var(--pai-text-tertiary);margin-bottom:26px;
}
.sponsor-logos{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));
  gap:22px 40px;align-items:center;justify-items:center;max-width:860px;margin:0 auto;
}
.sponsor-logos img{width:100%;max-width:230px;height:auto;opacity:0.88;
                   transition:opacity 160ms,transform 160ms;}
.sponsor-logos img:hover{opacity:1;transform:translateY(-2px);}
@media (max-width:480px){.sponsor-logos{grid-template-columns:repeat(2,1fr);}}

/* ---------- sponsorship ---------- */
.involve{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
@media (max-width:860px){.involve{grid-template-columns:1fr;}}
.involve-card{
  position:relative;background:var(--pai-surface-card);
  border:var(--pai-border-default) solid var(--pai-border);
  border-radius:var(--pai-radius-lg);padding:44px 32px;overflow:hidden;
  display:flex;flex-direction:column;align-items:center;text-align:center;
}
.involve-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--pai-accent) 0%, transparent 100%);}
.involve-card:nth-child(even)::before{
  background:linear-gradient(90deg,var(--pai-accent-secondary) 0%, transparent 100%);}
.involve-card h3{font-size:clamp(20px,2.4vw,26px);font-weight:700;margin:18px 0 14px;line-height:1.3;}
.involve-card p{font-size:15px;margin-bottom:26px;max-width:440px;}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--pai-border);padding:44px 0 56px;}
.footer-top{display:flex;justify-content:space-between;align-items:flex-start;gap:28px;flex-wrap:wrap;}
.footer-tag{color:var(--pai-text-secondary);font-size:14px;margin-top:10px;}
.footer-links{display:flex;gap:26px;font-size:14px;color:var(--pai-text-secondary);}
.footer-links a:hover{color:var(--pai-accent);}
.footer-motto{
  font-family:var(--pai-font-mono);font-size:11px;letter-spacing:var(--pai-tracking-widest);
  text-transform:uppercase;color:var(--pai-text-tertiary);margin-top:34px;
}
.footer-legal{color:var(--pai-text-tertiary);font-size:13px;margin-top:10px;}

@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important;}
  html{scroll-behavior:auto;}
}