/* ===== Light theme (default) ===== */
:root{
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #0b0d12;
  --muted: #5b6472;
  --brand: #6f3ff5;   /* purple */
  --accent: #00bcd4;  /* teal */
  --border: #e6e9f2;
}

html,body{margin:0;padding:0;background:var(--bg);color:var(--text);
  font-family: system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,"Helvetica Neue",Arial,"Noto Sans",sans-serif; line-height:1.6}

/* ===== Dark theme overrides ===== */
html[data-theme="dark"]{
  --bg:#0b0d12; --card:#121621; --text:#e6e8f0; --muted:#9aa4b2;
  --brand:#7c4dff; --accent:#00e5ff; --border:#232836;
}
html[data-theme="dark"] .site-header{background:rgba(11,13,18,.8)}
html[data-theme="dark"] .btn.ghost{background:transparent;color:#e6e8f0}
html[data-theme="dark"] .people .person{background:#0f1420}
html[data-theme="dark"] .about-banner{box-shadow:0 14px 36px rgba(0,0,0,.28)}


.container{max-width:1100px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;background:rgba(255,255,255,.9);
  backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid var(--border);z-index:9}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0;min-width:0}
.nav .brand{display:flex;align-items:center;gap:10px;font-weight:600;color:#2b3240}
/* .nav nav{display:flex;gap:12px;flex:1 1 auto;flex-wrap:nowrap;white-space:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch}
/* .nav nav::-webkit-scrollbar{display:none} */
/* .nav nav a{color:#4c5566;padding:6px 10px;border-radius:8px} */
/* .nav nav a:hover,.nav nav a.active{color:var(--text);background:#f2f4f8} */ */

/* Buttons */
.btn{display:inline-block;padding:10px 16px;border-radius:999px;border:1px solid var(--border);
  transition:transform .08s ease, box-shadow .2s ease}
.btn.primary{background:var(--brand);border-color:transparent;color:#fff}
.btn.ghost{background:#fff;color:#2b3240}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(15,23,42,.12)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn.sm{padding:6px 10px;font-size:.9rem}

.pill{display:inline-block;padding:6px 10px;border:1px solid #dfe3ee;border-radius:999px;color:#495065;background:#fff;margin-right:8px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--text);font-weight:600}
.logo{width:44px;height:44px;border-radius:12px;display:block}


/* Hero (soft, light gradient) */
.hero{background:
  radial-gradient(900px 500px at 20% -30%, rgba(111,63,245,.16), transparent),
  radial-gradient(900px 500px at 80% -20%, rgba(0,188,212,.14), transparent)}
.hero-inner{padding:72px 0 36px}
.hero h1{font-size:48px;line-height:1.1;margin:0 0 8px}
.hero p{max-width:700px;color:var(--muted);margin:0 0 16px}

/* Cards */
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:24px;margin:20px 0;
  box-shadow:0 8px 28px rgba(15,23,42,.08)}
.center{text-align:center}

/* Grids */
.grid{display:grid;gap:16px}
.grid.two{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid.three{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}

/* People tiles */
.people .person{background:#fff;border:1px solid var(--border);border-radius:12px;padding:12px}
.people .person img{width:100%;height:180px;object-fit:cover;background:#f4f6fb;border-radius:8px;margin-bottom:8px}

/* Sponsor row (small, single line) */
.sponsor-strip{display:flex;align-items:center;gap:24px;flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.sponsor-strip::-webkit-scrollbar{display:none}
.sponsor-logo{height:36px;width:auto;max-width:200px;object-fit:contain;flex:0 0 auto;display:block}

/* About banner */
.card img{max-width:100%;height:auto;display:block}
.about-banner{width:100%;height:clamp(220px,28vw,380px);object-fit:cover;object-position:center;border-radius:16px;margin:0 0 16px;box-shadow:0 14px 36px rgba(15,23,42,.10)}

/* --- Schedule table (light + dark friendly) --- */
.day-heading{margin:8px 0 10px;font-size:1.15rem}
.schedule-table{
  width:100%;
  border-collapse:separate; border-spacing:0;
  background:var(--card); border:1px solid var(--border);
  border-radius:12px; overflow:hidden;
  box-shadow:0 6px 18px rgba(15,23,42,.06);
}
.schedule-table thead th{
  position:sticky; top:0; z-index:1;
  background:#fff; /* overridden in dark below */
  color:var(--text); text-align:left; font-weight:700;
  padding:12px 14px; border-bottom:1px solid var(--border);
}
.schedule-table tbody td{padding:12px 14px; vertical-align:top; border-top:1px solid var(--border)}
.schedule-table tbody tr:nth-child(even){background:#f7f8fb}

/* Dark theme tweak if you use the toggle */
html[data-theme="dark"] .schedule-table thead th{background:#161a24}
html[data-theme="dark"] .schedule-table tbody tr:nth-child(even){background:#121621}

/* Mobile: stack rows into labeled blocks */
@media (max-width:700px){
  .schedule-table, .schedule-table thead, .schedule-table tbody, .schedule-table tr, .schedule-table th, .schedule-table td{display:block; width:100%}
  .schedule-table thead{display:none}
  .schedule-table tr{border-top:1px solid var(--border)}
  .schedule-table td{border:none; padding:8px 12px}
  .schedule-table td::before{
    content: attr(data-label);
    display:block; font-weight:600; color:var(--muted); margin-bottom:2px;
  }
}

/* Keep anchor targets visible under sticky header */
[id]{scroll-margin-top:80px}

/* Mobile tweaks */
@media (max-width:640px){ .hero h1{font-size:36px} }

/* --- Header / Nav polish --- */
.site-header{
  position:sticky; top:0; z-index:10;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid var(--border);
}
.nav{display:flex; align-items:center; justify-content:space-between; gap:16px; min-height:64px; padding:10px 0}
.brand{display:flex; align-items:center; gap:12px; text-decoration:none; color:var(--text); font-weight:700}
.logo{width:44px; height:44px; border-radius:12px; display:block}

/* Desktop menu */
.site-menu{display:flex; gap:14px; align-items:center; white-space:nowrap}
.nav-link{
  position:relative;
  color:#4c5566; text-decoration:none; padding:8px 10px; border-radius:10px;
  transition:color .2s ease, background .2s ease;
}
.nav-link:hover{ color:var(--text); background:#f2f4f8 }
.nav-link.active{ color:var(--text); background:#eef2ff }         /* subtle pill */
.nav-link.active::after, .nav-link:hover::after{
  content:""; position:absolute; left:10px; right:10px; bottom:-6px;
  height:3px; border-radius:3px; background:linear-gradient(90deg,var(--brand),var(--accent));
}


/* Mobile: closed by default; open only when header has data-menu="open"
.nav-toggle{ display:none; background:#fff; border:1px solid var(--border); border-radius:10px; padding:6px 10px }
@media (max-width:820px){
  .nav-toggle{ display:inline-block }
  .site-menu{
    position:absolute; right:20px; top:64px;
    display:none; flex-direction:column; gap:8px;
    background:#fff; border:1px solid var(--border); border-radius:12px; padding:10px;
    box-shadow:0 12px 30px rgba(15,23,42,.12);
  }
  .site-header[data-menu="open"] .site-menu{ display:flex }  /* <-- open state */
}
 */
/* IMPORTANT: remove any old rule like:
   .site-header.menu-open .site-menu{display:flex}
   so it doesn’t fight with the new data attribute. */

/* right-side wrapper so :checked sibling selectors work */
.nav-right{display:flex; align-items:center; gap:12px; position:relative}

/* hide the controller checkbox */
.navcb{position:absolute; opacity:0; pointer-events:none}

/* Desktop: menu always visible */
.site-menu{display:flex; gap:14px; align-items:center; white-space:nowrap}

/* Mobile */
.nav-toggle{display:none; background:#fff; border:1px solid var(--border); border-radius:10px; padding:6px 10px}
@media (max-width:820px){
  .nav-toggle{display:inline-block}
  .site-menu{
    position:absolute; right:0; top:54px;
    display:none;                      /* closed by default */
    flex-direction:column; gap:8px;
    background:#fff; border:1px solid var(--border); border-radius:12px; padding:10px;
    box-shadow:0 12px 30px rgba(15,23,42,.12);
    min-width:180px;
  }
  /* OPEN STATE: when the hidden checkbox is checked */
  .navcb:checked + .nav-toggle + .site-menu{ display:flex }
}

/* --- Header CTA: matches nav look, compact pill --- */
.header-cta{
  height:36px; line-height:36px;
  padding:0 14px;
  border-radius:999px;
  border:1px solid var(--border);
  font-weight:600; letter-spacing:.2px;
  background:linear-gradient(90deg,var(--brand),var(--accent));
  color:#fff; box-shadow:0 6px 18px rgba(15,23,42,.12);
}
.header-cta:hover{ transform:translateY(-1px); box-shadow:0 10px 24px rgba(15,23,42,.16) }
.header-cta:active{ transform:translateY(0) }

/* Make the mobile version look like a primary nav pill */
.nav-link.cta{
  color:#fff; background:linear-gradient(90deg,var(--brand),var(--accent));
}
.nav-link.cta:hover{ filter:brightness(1.05); }
.nav-link.cta::after{ display:none; } /* remove underline bar on CTA */

/* Show/hide the right CTA in responsive contexts */
.show-mobile{ display:none; }
@media (max-width:820px){
  .header-cta{ display:none; }  /* hide desktop button on phones */
  .show-mobile{ display:block; }
}

/* Keep the right block pinned right and spaced */
.nav-right{display:flex; align-items:center; gap:12px; position:relative; margin-left:auto}

/* Header CTA look (desktop) */
.header-cta{
  height:36px; line-height:36px; padding:0 14px;
  border-radius:999px; border:1px solid var(--border);
  font-weight:600; letter-spacing:.2px;
  background:linear-gradient(90deg,var(--brand),var(--accent));
  color:#fff; box-shadow:0 6px 18px rgba(15,23,42,.12);
}
.header-cta:hover{ transform:translateY(-1px); box-shadow:0 10px 24px rgba(15,23,42,.16) }
.header-cta:active{ transform:none }

/* Mobile: show CTA inside menu, hide desktop pill */
.show-mobile{ display:none; }
@media (max-width:820px){
  .header-cta{ display:none; }
  .show-mobile{ display:block; }
}

/* Code of Conduct polish */
.coc-hero{text-align:center;padding:26px 0 10px}
.coc-hero .lead{color:var(--muted);margin:6px 0 14px}
.badge-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:10px 0 16px}
.badge{display:inline-block;font-weight:600;font-size:.85rem;padding:6px 10px;border-radius:999px;border:1px solid var(--border);background:#fff}
.badge.ok{background:#ecfdf5;border-color:#a7f3d0;color:#065f46}
.badge.info{background:#eef2ff;border-color:#c7d2fe;color:#3730a3}
.badge.warn{background:#fff7ed;border-color:#fed7aa;color:#9a3412}

.callout{border:1px solid var(--border);border-radius:12px;padding:12px 14px;background:var(--card);margin:10px 0}
.callout.danger{border-color:#fecaca;background:#fff1f2;color:#7f1d1d}
html[data-theme="dark"] .callout.danger{background:#2a1113;border-color:#7f1d1d;color:#fecaca}

.report-box{display:grid;gap:10px;padding:16px;border:1px dashed var(--border);border-radius:12px;background:linear-gradient(0deg,rgba(0,188,212,.05),rgba(111,63,245,.05))}
.report-box .btn{width:max-content}

.timeline{counter-reset:step;list-style:none;padding-left:0;display:grid;gap:10px}
.timeline li{position:relative;padding-left:32px}
.timeline li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:0;width:22px;height:22px;border-radius:999px;background:linear-gradient(90deg,var(--brand),var(--accent));color:#fff;font-weight:700;display:grid;place-items:center;font-size:.85rem}

/* anchors visible under sticky header */
[id]{scroll-margin-top:90px}




/* === Sponsors — 4-per-row grid with uniform tiles === */
:root{
  --sponsor-tile-h: 72px; /* tweak height once to scale all logos */
}

.sponsor-grid{
  display:grid;
  grid-template-columns:repeat(4, minmax(0,1fr)); /* 4 in a line */
  gap:20px;
  align-items:stretch;
}

/* responsive columns */
@media (max-width:960px){
  .sponsor-grid{ grid-template-columns:repeat(3, minmax(0,1fr)); }
}
@media (max-width:640px){
  .sponsor-grid{ grid-template-columns:repeat(2, minmax(0,1fr)); }
}

/* uniform tiles */
.sponsor-tile{
  height:var(--sponsor-tile-h);
  padding:12px;
  border:1px solid var(--border);
  border-radius:12px;
  background:#fff;
  display:grid; place-items:center;
  box-shadow:0 2px 8px rgba(15,23,42,.06);
}
html[data-theme="dark"] .sponsor-tile{ background:#0f1420; }

/* fit logos inside tiles without distortion */
.sponsor-tile img{
  max-height:calc(var(--sponsor-tile-h) - 24px);
  max-width:100%;
  width:auto; height:auto; object-fit:contain; display:block;
}

/* neutralize generic .card img sizing inside sponsor area */
.card .sponsor-grid img{ max-width:100%; }







/* === Sponsors — CSS-only marquee (uniform tiles, pause on hover) === */
:root{
  --mq-gap: 16px;
  --tile-w: 180px;   /* desktop tile width */
  --tile-h: 72px;    /* desktop tile height */
  --mq-speed: 10s;   /* animation duration; increase for slower scroll */
}

.card.narrow{ max-width:960px; margin:20px auto; }

.sponsor-marquee{
  overflow:hidden; position:relative;
}

.marquee-track{
  display:flex; gap:var(--mq-gap);
  width:max-content;                       /* shrink-wrap content */
  animation: marquee var(--mq-speed) linear infinite;
  will-change: transform;
}
.sponsor-marquee:hover .marquee-track{ animation-play-state: paused; }

.sponsor-tile{
  width:var(--tile-w); height:var(--tile-h);
  padding:12px; border:1px solid var(--border); border-radius:12px;
  background:#fff; display:grid; place-items:center;
  box-shadow:0 2px 8px rgba(15,23,42,.06);
}
html[data-theme="dark"] .sponsor-tile{ background:#0f1420; }

.sponsor-tile img{
  max-height:calc(var(--tile-h) - 24px);
  max-width:100%; width:auto; height:auto; object-fit:contain; display:block;
}

/* neutralize generic .card img inside this component */
.card .sponsor-marquee img{ max-width:100%; }

@media (max-width:960px){ :root{ --tile-w:170px; --tile-h:64px; --mq-speed: 26s; } }
@media (max-width:640px){  :root{ --tile-w:160px; --tile-h:56px; --mq-speed: 24s; } }

@keyframes marquee{
  from{ transform: translateX(0); }
  to  { transform: translateX(calc(-50% - var(--mq-gap))); } /* move by half because we duplicated the list */
}