/* AI Transformation Summit — self-contained premium stylesheet.
   Deck-matched: warm cream canvas, deep-indigo type, yellow highlighter accents,
   dark accent bands for rhythm. Hanken Grotesk (sans) + Fraunces (serif accents). */

:root{
  --cream:#faf0e5;        /* page canvas — matches the deck exactly */
  --cream-2:#fdf9f0;      /* lifted cards / alt sections */
  --ink:#211c3b;          /* primary text */
  --indigo:#2a2547;       /* dark bands */
  --indigo-2:#1c1838;     /* deepest */
  --muted:#5b5570;        /* secondary text on cream */
  --muted-light:rgba(247,239,225,.72); /* secondary text on dark */
  --teal:#3fa9b8;         /* eyebrows */
  --yellow:#ffd34e;       /* highlight + accent */
  --yellow-deep:#f5be2e;
  --line:rgba(33,28,59,.12);
  --line-light:rgba(247,239,225,.16);
  --sans:'Hanken Grotesk',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --serif:'Fraunces',Georgia,serif;
  --max:1240px;
  --r:20px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--cream);color:var(--ink);font-family:var(--sans);line-height:1.6;
  font-size:17px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

h1,h2,h3,h4{font-family:var(--sans);font-weight:800;letter-spacing:-.02em;line-height:1.05;color:var(--ink);
  overflow-wrap:break-word;hyphens:auto}
h1{font-size:clamp(2.2rem,7vw,5.6rem)}
h2{font-size:clamp(1.95rem,5vw,3.7rem)}
h3{font-size:1.35rem;letter-spacing:-.01em}
h4{font-size:1.18rem;font-weight:700;letter-spacing:-.01em}
p{color:var(--ink)}
.muted{color:var(--muted)}
.ico{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}

/* deck accents */
.accent{font-family:var(--serif);font-weight:500;font-style:italic;color:var(--yellow)} /* use on DARK only */
.hl{background:var(--yellow);color:var(--ink);padding:.04em .26em;border-radius:6px;
  -webkit-box-decoration-break:clone;box-decoration-break:clone}
.eyebrow{display:block;font-size:.8rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:var(--teal);margin-bottom:1.2rem}
.eyebrow-light{color:var(--yellow)}

/* ---------- nav (dark, slim) ---------- */
.nav{position:sticky;top:0;z-index:60;display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.85rem clamp(1.1rem,4vw,2.4rem);background:rgba(28,24,56,.86);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line-light)}
.nav-logo img{height:30px}
.nav-links{display:flex;gap:2rem;font-size:.95rem;font-weight:500}
.nav-links a{color:rgba(247,239,225,.86);transition:color .2s}
.nav-links a:hover{color:#fff}
.nav-burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer}
.nav-burger span{width:24px;height:2px;background:var(--cream);border-radius:2px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--sans);font-weight:700;font-size:.98rem;
  padding:.85rem 1.7rem;border-radius:999px;cursor:pointer;border:1px solid transparent;
  transition:transform .16s ease,box-shadow .2s ease,background .2s}
.btn:hover{transform:translateY(-2px)}
.btn-yellow{background:var(--yellow);color:var(--ink);box-shadow:0 12px 34px -12px rgba(245,190,46,.7)}
.btn-yellow:hover{background:var(--yellow-deep);box-shadow:0 16px 40px -12px rgba(245,190,46,.8)}
.btn-dark{background:var(--ink);color:var(--cream)}
.btn-dark:hover{background:var(--indigo)}
.btn-ghost-light{background:transparent;border-color:rgba(247,239,225,.4);color:var(--cream)}
.btn-ghost-light:hover{background:rgba(247,239,225,.08)}
.btn-wide{width:100%;justify-content:center;margin-top:1.4rem}
.nav-cta{padding:.6rem 1.25rem;font-size:.9rem}

/* ---------- section rhythm ---------- */
.section{max-width:var(--max);margin:0 auto;padding:clamp(3rem,6vw,5.5rem) clamp(1.2rem,4vw,2.4rem)}
.section-tint{max-width:none;background:var(--cream-2);border-block:1px solid var(--line)}
.section-tint>*{max-width:var(--max);margin-inline:auto}
.center-head{max-width:760px;margin:0 auto 1rem;text-align:center}
.center-head .muted{font-size:1.1rem;margin-top:1rem}
.badge{display:inline-flex;align-items:center;gap:.5rem;font-size:.8rem;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--teal);margin-bottom:1.2rem}
.badge .ico{width:16px;height:16px;stroke:var(--teal)}

/* ---------- hero (dark, deck-cover gradient: violet → indigo, warm lower-right) ---------- */
.summit-hero{position:relative;overflow:hidden;color:var(--cream);
  background:radial-gradient(1100px 720px at 32% 6%,rgba(124,101,186,.30),transparent 60%),
             radial-gradient(900px 820px at 93% 80%,rgba(255,170,72,.13),transparent 56%),
             linear-gradient(160deg,#2c2655 0%,#211c44 56%,#191534 100%)}
/* animated constellation mesh (drawn by js/main.js); sits above the gradient, below content.
   masked to fade out on the left so the network sits behind the type, like the deck cover. */
.hero-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:0;display:block;pointer-events:none;
  -webkit-mask-image:linear-gradient(100deg,transparent 4%,rgba(0,0,0,.35) 34%,#000 72%);
  mask-image:linear-gradient(100deg,transparent 4%,rgba(0,0,0,.35) 34%,#000 72%)}
.summit-hero-inner{position:relative;z-index:1;max-width:var(--max);margin:0 auto;
  padding:clamp(4rem,10vw,8rem) clamp(1.2rem,4vw,2.4rem) clamp(3.5rem,8vw,6rem)}
.summit-hero h1{color:#fff;max-width:15ch}
.summit-hero h1 .accent{font-weight:500}
.hero-kicker{display:inline-block;font-size:.82rem;font-weight:700;letter-spacing:.2em;text-transform:uppercase;
  color:#fff;padding:.5rem 1.05rem;border:1px solid var(--line-light);border-radius:999px;margin-bottom:1.8rem;
  background:rgba(247,239,225,.05)}
.summit-hero-sub{font-size:clamp(1.18rem,2.3vw,1.55rem);color:var(--cream);max-width:42ch;margin:1.6rem 0 2.2rem;
  line-height:1.5;font-weight:400}
.event-grid{display:flex;flex-wrap:wrap;gap:.9rem;margin-bottom:2.4rem}
.meta-card{background:rgba(247,239,225,.06);border:1px solid var(--line-light);border-radius:14px;
  padding:.85rem 1.15rem;display:flex;flex-direction:column;gap:.3rem;min-width:150px}
.meta-label{display:flex;align-items:center;gap:.4rem;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--muted-light)}
.meta-label .ico{width:14px;height:14px;stroke:var(--yellow)}
.meta-card strong{font-size:1.02rem;font-weight:700;color:#fff}
.hero-ctas{display:flex;gap:1rem;flex-wrap:wrap}

/* ---------- statement bands ---------- */
.statement{max-width:var(--max);margin:0 auto;padding:clamp(2.6rem,5vw,4.5rem) clamp(1.2rem,4vw,2.4rem)}
.statement h2{font-size:clamp(2.2rem,5.2vw,4.1rem);max-width:18ch;line-height:1.12}
.statement-foot{color:var(--muted);font-size:1.12rem;max-width:50ch;margin-top:1.5rem}
.statement-dark{max-width:none;color:var(--cream);
  background:radial-gradient(900px 600px at 85% 0%,rgba(63,169,184,.22),transparent 60%),linear-gradient(150deg,#241f42,#1a1633)}
.statement-dark>*{max-width:var(--max);margin-inline:auto}
.statement-dark h2{color:#fff}
.statement-foot.light{color:var(--muted-light)}

/* ---------- who's in the room ---------- */
.room-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem;margin-top:2.8rem}
.panel{background:var(--cream-2);border:1px solid var(--line);border-radius:var(--r);padding:1.9rem}
.room-card{display:flex;flex-direction:column;gap:.7rem;transition:transform .18s,box-shadow .2s}
.room-card:hover{transform:translateY(-4px);box-shadow:0 28px 50px -30px rgba(33,28,59,.35)}
.room-num{font-size:.95rem;font-weight:800;color:var(--teal)}
.room-card h3{line-height:1.2}
.room-card .muted{font-size:.98rem}

/* ---------- agenda ---------- */
.agenda-list{max-width:900px;margin:2.8rem auto 0;list-style:none}
.agenda-item{display:flex;gap:1.6rem;align-items:flex-start;padding:1.6rem 0;border-top:1px solid var(--line)}
.agenda-item:last-child{border-bottom:1px solid var(--line)}
.agenda-num{font-weight:800;font-size:1.15rem;color:var(--yellow-deep);min-width:2.4rem;padding-top:.15rem}
.agenda-item .muted{margin-top:.3rem}

/* ---------- stat band (the room is the product) ---------- */
.stat-band{max-width:none;text-align:center;color:var(--cream);
  background:radial-gradient(900px 600px at 15% 0%,rgba(63,169,184,.2),transparent 60%),linear-gradient(150deg,#241f42,#1a1633);
  padding:clamp(4rem,9vw,7rem) clamp(1.2rem,4vw,2.4rem)}
.stat-band-title{color:#fff;font-size:clamp(2.2rem,5vw,3.8rem)}
.stat-row{max-width:var(--max);margin:3rem auto 0;display:grid;grid-template-columns:repeat(3,1fr);gap:2.4rem}
.stat-num{display:block;font-family:var(--serif);font-weight:600;font-size:clamp(3.2rem,7vw,5rem);line-height:1;
  color:var(--yellow);margin-bottom:.8rem}
.stat-row .stat p{color:var(--muted-light);font-size:1rem;max-width:28ch;margin:0 auto}

/* ---------- calibre stats + brand marquee ---------- */
.calibre-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;margin-top:2.8rem}
.calibre-stat{padding:1.8rem 1.3rem;border:1px solid var(--line);border-radius:var(--r);background:var(--cream-2);text-align:left}
.c-num{display:block;font-family:var(--serif);font-weight:600;font-size:clamp(2.4rem,4.6vw,3.2rem);line-height:1;
  color:var(--ink);margin-bottom:.7rem}
.c-num .u{color:var(--teal)}
.calibre-stat .muted{font-size:.95rem}
.logo-wall-head{text-align:center;font-size:.78rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:var(--muted);margin:3.4rem 0 1.5rem}
/* logo-card grid — real logos cropped from the deck, on matching cream cards */
.logo-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:.85rem}
.logo-cell{display:flex;align-items:center;justify-content:center;background:var(--cream);
  border:1px solid var(--line);border-radius:14px;padding:1.1rem .9rem;min-height:86px}
.logo-cell img{max-height:30px;max-width:86%;width:auto;object-fit:contain;display:block}
.logo-grid-lg{grid-template-columns:repeat(3,1fr);gap:1.1rem;max-width:1000px;margin:0 auto}
.logo-grid-lg .logo-cell{min-height:148px;padding:1.8rem;border-radius:18px}
.logo-grid-lg .logo-cell img{max-height:54px;max-width:80%}

/* ---------- why sponsor ---------- */
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:2rem 2.8rem;margin-top:2.8rem}
.why-item{padding-top:1.5rem;border-top:2px solid var(--ink)}
.why-num{font-weight:800;font-size:1.15rem;color:var(--teal)}
.why-item h4{margin:.7rem 0 .4rem;font-size:1.3rem}
.why-item .muted{margin:0}

/* ---------- sponsorship tiers (dark headline + light category) ---------- */
.tier-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:1.4rem;margin-top:3rem;align-items:start}
.tier-card{border-radius:24px;padding:2.2rem}
.tier-card.featured{color:var(--cream);background:linear-gradient(155deg,#2a2547,#1c1838);
  box-shadow:0 40px 80px -40px rgba(33,28,59,.6)}
.tier-card:not(.featured){background:var(--cream-2);border:1px solid var(--line)}
.tier-flag{display:inline-block;font-size:.8rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink);background:var(--yellow);padding:.45rem 1rem;border-radius:999px;margin-bottom:1.6rem}
.tier-flag-muted{background:transparent;color:var(--teal);border:1px solid var(--line);padding:.45rem 1rem}
.tier-list{list-style:none;display:flex;flex-direction:column;gap:.95rem}
.tier-list li{display:flex;gap:.7rem;align-items:flex-start;font-size:1rem;line-height:1.4}
.tier-card.featured .tier-list li{color:var(--cream)}
.tier-list .ico{width:18px;height:18px;flex-shrink:0;margin-top:.16rem;stroke:var(--yellow-deep)}
.tier-card.featured .tier-list .ico{stroke:var(--yellow)}

/* ---------- previous sponsors (uses .logo-grid.logo-grid-lg) ---------- */
.proof-logos{margin-top:2.2rem}

/* ---------- sponsor form ---------- */
.sponsor-section{scroll-margin-top:80px}
.sponsor-wrap{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem);align-items:start;
  background:linear-gradient(155deg,#2a2547,#1c1838);color:var(--cream);border-radius:28px;
  padding:clamp(2rem,4.5vw,3.4rem);box-shadow:0 40px 90px -50px rgba(33,28,59,.7)}
.sponsor-pitch h2{color:#fff;font-size:clamp(1.8rem,3vw,2.5rem)}
.sponsor-pitch .muted{color:var(--muted-light);margin-top:1rem}
.sponsor-ticks{list-style:none;margin-top:1.6rem;display:flex;flex-direction:column;gap:.85rem}
.sponsor-ticks li{display:flex;gap:.6rem;align-items:center;color:var(--cream);font-size:1rem}
.sponsor-ticks .ico{width:18px;height:18px;stroke:var(--yellow);flex-shrink:0}
.sponsor-form{display:flex;flex-direction:column;gap:.85rem}
.sponsor-form input,.sponsor-form select,.sponsor-form textarea{width:100%;padding:.9rem 1.05rem;border-radius:12px;
  border:1px solid var(--line-light);background:rgba(247,239,225,.07);color:var(--cream);font-family:var(--sans);font-size:1rem}
.sponsor-form select{appearance:none;cursor:pointer;padding-right:2.6rem;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f7efe1' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 1rem center;background-size:18px}
.sponsor-form option{color:#211c3b}
.sponsor-form ::placeholder{color:rgba(247,239,225,.5)}
.sponsor-form input:focus,.sponsor-form select:focus,.sponsor-form textarea:focus{outline:none;border-color:var(--yellow)}
.form-confirm,.form-error{display:flex;align-items:center;gap:.5rem;margin-top:1.3rem;font-size:1rem;
  max-width:var(--max);margin-inline:auto}
.form-confirm{color:var(--ink);font-weight:600}
.form-confirm .ico{width:20px;height:20px;stroke:var(--yellow-deep)}
.form-error{color:#c0392b}
.form-confirm[hidden],.form-error[hidden]{display:none}

/* ---------- footer (dark) ---------- */
.footer{color:var(--cream);background:linear-gradient(150deg,#1c1838,#15122c);margin-top:0}
.footer-grid{max-width:var(--max);margin:0 auto;padding:clamp(2.5rem,5vw,3.5rem) clamp(1.2rem,4vw,2.4rem);
  display:grid;grid-template-columns:2fr 1fr 1fr;gap:2rem}
.footer-logo{height:28px}
.footer-tag{color:var(--muted-light);font-size:.88rem;margin-top:1rem;max-width:38ch}
.footer h5{font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--yellow);margin-bottom:1rem;font-weight:700}
.footer-grid a{display:flex;align-items:center;gap:.5rem;color:var(--muted-light);font-size:.95rem;margin-bottom:.7rem;transition:color .2s}
.footer-grid a:hover{color:#fff}
.footer .li{width:18px;height:18px}
.footer-base{max-width:var(--max);margin:0 auto;padding:1.2rem clamp(1.2rem,4vw,2.4rem);border-top:1px solid var(--line-light);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:.5rem;color:var(--muted-light);font-size:.85rem}

/* ---------- hero entrance (pure CSS, no JS/CSP cost; exceeds the static deck) ---------- */
@keyframes rise{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}
.summit-hero-inner>*{animation:rise .8s cubic-bezier(.2,.7,.2,1) backwards}
.hero-kicker{animation-delay:.02s}
.summit-hero h1{animation-delay:.1s}
.summit-hero-sub{animation-delay:.2s}
.event-grid{animation-delay:.3s}
.hero-ctas{animation-delay:.4s}
@media(prefers-reduced-motion:reduce){
  .summit-hero-inner>*{animation:none}
  .brand-marquee-track{animation:none}
}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .nav-links{display:none}
  .nav-cta{display:none}
  .nav.open .nav-links{display:flex;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:1.1rem;
    background:rgba(28,24,56,.98);padding:1.3rem clamp(1.1rem,4vw,2.4rem);border-bottom:1px solid var(--line-light)}
  .nav-burger{display:flex}
  .room-grid,.why-grid,.tier-grid,.stat-row,.sponsor-wrap{grid-template-columns:1fr}
  .calibre-grid{grid-template-columns:repeat(2,1fr)}
  .logo-grid{grid-template-columns:repeat(3,1fr)}
  .logo-grid-lg{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  body{font-size:16px}
  .calibre-grid{grid-template-columns:1fr}
  /* 15-logo grid stays 3 cols (5 even rows) on phones — 2 cols left an orphan row.
     previous-partners (6 logos) sits at 2 cols. tighter cells so the logos fill the
     card and read clearly at 375px instead of floating in whitespace. */
  .logo-grid{grid-template-columns:repeat(3,1fr);gap:.5rem}
  .logo-grid-lg{grid-template-columns:repeat(2,1fr)}
  .logo-cell{min-height:60px;padding:.6rem;border-radius:11px}
  .logo-cell img{max-height:26px;max-width:90%}
  .logo-grid-lg .logo-cell{min-height:90px;padding:1.1rem}
  .logo-grid-lg .logo-cell img{max-height:40px}
  .footer-grid{grid-template-columns:1fr}
  .meta-card{flex:1 1 42%;min-width:0}
}