/* AI Ultra Festival — shared brand theme for the standalone pages
 * (newsletter, speaker application, sponsor prospectus, schedule).
 * Mirrors the design tokens used by the main site (build_event.py). */
:root{
  --bg:#e7e1fb; --bg2:#ffffff; --ink:#0f0b26; --muted:#403b6b; --faint:#6f6a97;
  --card:rgba(255,255,255,.97); --line:rgba(88,72,180,.34); --chip:rgba(224,216,255,.96);
  --accent:#3b34d6; --accent2:#7a4fd8; --accent3:#b07fe0;
  --shadow:0 26px 60px -30px rgba(80,60,160,.35);
  --holo1:#6d28d9; --holo2:#db2777; --holo3:#2a49d8; --holo4:#0f9d84; --holo5:#c2751a;
  --ok:#1e9e73; --warn:#b8791f; --idea:#3d9be0;
  --disp:"Helvetica Neue",system-ui,sans-serif; --mono:ui-monospace,"SF Mono",Menlo,monospace;
  --maxw:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--disp);
  -webkit-font-smoothing:antialiased;line-height:1.55;position:relative;z-index:0;min-height:100vh}
body::before{content:"";position:fixed;inset:0;z-index:-2;background:
  radial-gradient(1100px 700px at 80% -10%,rgba(124,58,237,.14),transparent 60%),
  radial-gradient(900px 640px at 5% 8%,rgba(14,127,208,.12),transparent 55%),var(--bg)}
a{color:var(--holo3);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{letter-spacing:-.02em;text-wrap:balance;margin:0 0 .4em}
h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;line-height:1.03}
h2{font-size:clamp(1.4rem,3vw,2rem);font-weight:800}
p{margin:0 0 1em}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(18px,4vw,40px)}
.holo{background:linear-gradient(100deg,var(--holo1),var(--holo2),var(--holo3),var(--holo4),var(--holo5),var(--holo1));
  background-size:200% auto;-webkit-background-clip:text;background-clip:text;color:transparent}
.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.3em;text-transform:uppercase;color:var(--muted);margin:0 0 .6em}
.mono{font-family:var(--mono)}
.muted{color:var(--muted)}

/* nav */
nav.top{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
nav.top .inner{max-width:var(--maxw);margin:0 auto;padding:12px clamp(18px,4vw,40px);display:flex;align-items:center;gap:16px}
nav.top .brand img{height:26px;width:auto;display:block;filter:drop-shadow(0 2px 10px rgba(150,110,220,.45))}
nav.top .spacer{margin-left:auto}
nav.top a.navlink{color:var(--muted);font-size:.86rem}
nav.top a.navlink:hover{color:var(--ink);text-decoration:none}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.5em;font-weight:600;font-size:.95rem;text-decoration:none;
  border-radius:100px;padding:13px 26px;border:none;cursor:pointer;white-space:nowrap;
  background:linear-gradient(100deg,var(--holo1),var(--holo2),var(--holo3));background-size:200% 100%;color:#ffffff;
  transition:transform .18s,background-position .5s}
.btn:hover{transform:translateY(-2px);background-position:100% 0;text-decoration:none}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--muted);background:var(--chip)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}

/* cards + forms */
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:clamp(22px,3vw,34px);backdrop-filter:blur(12px);box-shadow:var(--shadow)}
.field{display:flex;flex-direction:column;gap:7px;margin:0 0 16px}
.field label{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.field .req{color:var(--holo2)}
.field input,.field textarea,.field select{
  width:100%;background:#ffffff;border:1px solid var(--line);border-radius:12px;
  color:var(--ink);font:inherit;font-size:1rem;padding:12px 14px;transition:border-color .18s,box-shadow .18s}
.field input::placeholder,.field textarea::placeholder{color:var(--faint)}
.field textarea{min-height:120px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(59,52,214,.16)}
.field .hint{font-size:.82rem;color:var(--faint)}
.field.err input,.field.err textarea{border-color:#e5455f}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
@media(max-width:560px){.row2{grid-template-columns:1fr}}

/* status pills (agenda) */
.pill{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;
  text-transform:uppercase;border-radius:100px;padding:4px 10px;border:1px solid var(--line);background:var(--chip);color:var(--muted)}
.pill.confirmed{color:#0c1a12;background:var(--ok);border-color:transparent}
.pill.penciled{color:#241a06;background:var(--warn);border-color:transparent}
.pill.idea{color:#08202c;background:var(--idea);border-color:transparent}

/* footer */
footer.site{border-top:1px solid var(--line);margin-top:64px;padding:34px 0;color:var(--faint);font-size:.86rem}
footer.site .inner{max-width:var(--maxw);margin:0 auto;padding:0 clamp(18px,4vw,40px);display:flex;flex-wrap:wrap;gap:14px;align-items:center}
footer.site .spacer{margin-left:auto}

/* generic toast / notice */
.notice{border-radius:14px;padding:14px 16px;border:1px solid var(--line);background:var(--chip);font-size:.92rem}
.notice.ok{border-color:rgba(138,255,192,.5);background:rgba(138,255,192,.1);color:#c8ffe0}
.notice.bad{border-color:rgba(255,138,156,.5);background:rgba(255,138,156,.1);color:#ffd0d6}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}