/* ==========================================================
   v5 — Dark Premium theme
   Static landing for GitHub Pages (no build step)
   ========================================================== */

:root{
  --bg: #0b0f14;
  --bg-2: #0f141b;
  --card: rgba(255,255,255,0.06);
  --card-2: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.12);
  --border-2: rgba(255,255,255,0.18);
  --text: rgba(245,246,247,0.98);
  --muted: rgba(245,246,247,0.72);
  --muted-2: rgba(245,246,247,0.55);
  --gold: #d4af37;
  --gold-2: #b88a1e;

  --radius: 14px;
  --radius-lg: 18px;

  --shadow: 0 18px 42px rgba(0,0,0,0.46);
  --shadow-soft: 0 10px 24px rgba(0,0,0,0.35);

  --container: 1120px;
  --measure: 74ch;

  --s-1: 8px;
  --s-2: 12px;
  --s-3: 16px;
  --s-4: 24px;
  --s-5: 32px;
  --s-6: 48px;
  --s-7: 64px;

  --nav-h: 72px;
}

*{ box-sizing: border-box; }
html{ color-scheme: dark; }
body{
  margin: 0;
  background: radial-gradient(1200px 700px at 15% 0%, rgba(212,175,55,0.14), transparent 55%),
              radial-gradient(900px 520px at 80% -10%, rgba(212,175,55,0.10), transparent 50%),
              linear-gradient(180deg, var(--bg), var(--bg-2));
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  line-height: 1.55;
}

img{ max-width: 100%; height: auto; }
a{ color: inherit; text-decoration: none; }
a:hover{ text-decoration: none; }

.container{
  width: min(var(--container), calc(100% - 2*var(--s-4)));
  margin: 0 auto;
}

.mono{ font-variant-numeric: tabular-nums; }

.muted{ color: var(--muted); }
.muted-2{ color: var(--muted-2); }

.visually-hidden{
  position:absolute !important;
  width:1px; height:1px;
  padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0);
  white-space:nowrap; border:0;
}

/* ====== Header / Nav ====== */
.header{
  position: sticky;
  top: 0;
  z-index: 60;
  backdrop-filter: blur(10px);
  background: rgba(11,15,20,0.68);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.keybar{
  background: rgba(212,175,55,0.10);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.keybar .container{
  padding: 8px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--muted);
}
.keybar strong{ color: var(--text); font-weight: 700; }
.keybar a{ color: var(--text); text-decoration: underline; text-decoration-color: rgba(212,175,55,0.8); }



.nav{
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
}

.brand{
  display: flex;
  align-items: center;
  gap: var(--s-3);
  min-width: 220px;
}
.brand img{
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: var(--shadow-soft);
}
.brand .brand-text{
  display: grid;
  gap: 2px;
  line-height: 1.1;
}
.brand .brand-text strong{ font-size: 14px; letter-spacing: 0.2px; }
.brand .brand-text span{ font-size: 12px; color: var(--muted); }

.navlinks{
  display: flex;
  gap: var(--s-3);
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}
.navlinks a{
  font-size: 13px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 10px;
  transition: background 150ms ease, color 150ms ease;
}
.navlinks a:hover{
  color: var(--text);
  background: rgba(255,255,255,0.06);
}

.nav-cta{
  display: flex;
  gap: var(--s-2);
  align-items: center;
}

/* ====== Buttons ====== */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 650;
  letter-spacing: 0.2px;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease, box-shadow 140ms ease, color 140ms ease;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}
.btn:active{ transform: translateY(1px); }

.btn-primary{
  background: linear-gradient(180deg, rgba(212,175,55,1), rgba(184,138,30,1));
  color: #0b0f14;
  box-shadow: 0 18px 40px rgba(212,175,55,0.18);
}
.btn-primary:hover{
  box-shadow: 0 22px 52px rgba(212,175,55,0.24);
  transform: translateY(-1px);
}

.btn-secondary{
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.14);
  color: var(--text);
}
.btn-secondary:hover{
  background: rgba(255,255,255,0.10);
  border-color: rgba(255,255,255,0.22);
  transform: translateY(-1px);
}

.btn-ghost{
  background: transparent;
  border-color: rgba(255,255,255,0.16);
  color: var(--text);
}
.btn-ghost:hover{
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.24);
  transform: translateY(-1px);
}

.btn-small{
  padding: 9px 12px;
  border-radius: 12px;
  font-size: 13px;
}

.badge{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(212,175,55,0.16);
  border: 1px solid rgba(212,175,55,0.28);
  color: rgba(245,246,247,0.92);
  font-weight: 650;
}

.kicker{
  color: rgba(212,175,55,0.92);
  letter-spacing: 0.6px;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 700;
}

/* ====== Hero ====== */
.hero{
  position: relative;
  min-height: 82vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: var(--s-6) 0 var(--s-7);
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    linear-gradient(90deg, rgba(11,15,20,0.92) 0%, rgba(11,15,20,0.62) 46%, rgba(11,15,20,0.80) 100%),
    radial-gradient(900px 520px at 70% 30%, rgba(212,175,55,0.18), transparent 60%),
    radial-gradient(800px 480px at 20% 0%, rgba(212,175,55,0.12), transparent 55%),
    image-set(
      url("../img/SPB.webp") type("image/webp"),
      url("../img/SPB.jpeg") type("image/jpeg")
    );
  background-size: cover;
  background-position: center;
  filter: saturate(1.05) contrast(1.05);
  transform: scale(1.02);
}
.hero::after{
  content:"";
  position:absolute;
  inset:0;
  background: linear-gradient(180deg, transparent 0%, rgba(11,15,20,0.92) 92%);
}
.hero .container{
  position: relative;
  z-index: 2;
}

.hero-grid{
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: var(--s-6);
  align-items: center;
}
.hero h1{
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.5px;
  margin: 12px 0 12px;
  max-width: 22ch;
}
.hero .subtitle{
  font-size: 18px;
  color: var(--muted);
  margin: 0 0 var(--s-4);
}
.cta-row{
  display: flex;
  gap: var(--s-2);
  flex-wrap: wrap;
  align-items: center;
}
.hero .what-you-get{
  margin-top: var(--s-3);
  display: flex;
  gap: var(--s-3);
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 14px;
}
.hero .what-you-get span{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  border-radius: 999px;
}

.logo-panel{
  display: grid;
  gap: var(--s-3);
}
.logo-strip{
  border: 1px solid rgba(255,255,255,0.10);
  background: rgba(0,0,0,0.25);
  border-radius: var(--radius-lg);
  padding: var(--s-3);
  box-shadow: var(--shadow-soft);
}
.logo-strip:not(.logo-stack) img{
  width: 100%;
  height: auto;
  opacity: 0.92;
  filter: saturate(1.05);
}
.hero-card{
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-lg);
  padding: var(--s-4);
  box-shadow: var(--shadow);
}
.hero-card h3{
  margin: 0 0 10px;
  font-size: 15px;
  letter-spacing: 0.2px;
}
.hero-card ul{
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}
.hero-card li{
  display: flex;
  justify-content: space-between;
  gap: var(--s-3);
  border-bottom: 1px dashed rgba(255,255,255,0.16);
  padding-bottom: 10px;
}
.hero-card li:last-child{
  border-bottom: none;
  padding-bottom: 0;
}
.hero-card strong{ color: var(--text); font-weight: 700; }


/* ====== Page utilities ====== */
.page-head{
  padding: calc(var(--s-7) - 10px) 0 var(--s-6);
}
.page-head h1{ margin-top: 8px; }
.breadcrumbs{
  font-size: 13px;
  color: var(--muted-2);
}
.breadcrumbs a{ color: var(--muted); }
.breadcrumbs a:hover{ color: var(--text); }

.bullets{
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
}
.bullets li{ margin: 6px 0; }

/* ====== Sections ====== */
.section{
  padding: var(--s-7) 0;
}
.section.compact{
  padding: var(--s-6) 0;
}
.section h2{
  font-size: 28px;
  letter-spacing: -0.2px;
  margin: 0 0 var(--s-3);
}
.section p.lead{
  max-width: var(--measure);
  color: var(--muted);
  margin: 0 0 var(--s-5);
}

.grid-3{
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: var(--s-3);
}
.grid-2{
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: var(--s-3);
}
.card{
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.045);
  border-radius: var(--radius-lg);
  padding: var(--s-4);
  box-shadow: var(--shadow-soft);
}
.card:hover{
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.055);
}
.card h3{
  margin: 0 0 8px;
  font-size: 16px;
}
.card p{
  margin: 0;
  color: var(--muted);
}

.kpi{
  display: grid;
  gap: 6px;
}
.kpi .value{
  font-size: 20px;
  font-weight: 780;
}
.kpi .label{
  color: var(--muted-2);
  font-size: 13px;
}

/* ====== Audience routes ====== */
.route{
  position: relative;
  overflow: hidden;
}
.route .steps{
  margin-top: var(--s-3);
  display: grid;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}
.route .steps span{
  display: inline-flex;
  gap: 10px;
  align-items: baseline;
}
.route .steps b{
  color: var(--gold);
  font-weight: 800;
}
.route .actions{
  margin-top: var(--s-4);
  display: flex;
  gap: var(--s-2);
  flex-wrap: wrap;
}
.route .hint{
  margin-top: var(--s-3);
  color: var(--muted-2);
  font-size: 13px;
}

/* ====== Icon cards ====== */
.icon-card{
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--s-3);
  align-items: start;
}
.icon{
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(212,175,55,0.12);
  border: 1px solid rgba(212,175,55,0.24);
  display: grid;
  place-items: center;
}
.icon svg{ width: 22px; height: 22px; stroke: rgba(245,246,247,0.90); }

.tag{
  display: inline-flex;
  align-items: center;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 12px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.04);
  color: var(--muted);
  margin-top: 10px;
}

/* ====== Callout ====== */
.callout{
  border: 1px solid rgba(212,175,55,0.28);
  background: radial-gradient(900px 240px at 20% 0%, rgba(212,175,55,0.18), transparent 55%),
              rgba(255,255,255,0.04);
  border-radius: var(--radius-lg);
  padding: var(--s-5);
  box-shadow: var(--shadow);
}
.callout h3{ margin: 0 0 10px; font-size: 18px; }
.callout ul{ margin: 0; padding-left: 18px; color: var(--muted); }
.callout .row{
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--s-3);
  align-items: start;
}
.callout-inner{
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--s-3);
  align-items: start;
}
.callout .btn{ margin-top: 10px; }

/* ====== Speakers ====== */
.speakers-grid{
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: var(--s-3);
}
.speaker{
  padding: var(--s-4);
  display: grid;
  gap: 12px;
}
.speaker .photo{
  width: 78px;
  height: 78px;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(212,175,55,0.25);
  background: rgba(0,0,0,0.25);
}
.speaker .photo img{ width: 100%; height: 100%; object-fit: cover; }
.speaker .name{ font-weight: 780; letter-spacing: 0.2px; }
.speaker .org{ color: var(--muted); font-size: 13px; }
.speaker .topic{ color: var(--muted-2); font-size: 13px; margin-top: 2px; }

/* ====== Program tabs / timeline ====== */
.tabs{
  display: flex;
  gap: var(--s-2);
  flex-wrap: wrap;
  margin: var(--s-4) 0 var(--s-3);
}
.tab-btn{
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.04);
  color: var(--muted);
  font-weight: 720;
  cursor: pointer;
}
.tab-btn[aria-selected="true"]{
  border-color: rgba(212,175,55,0.44);
  background: rgba(212,175,55,0.16);
  color: rgba(245,246,247,0.94);
}
.timeline{
  display: grid;
  gap: 12px;
}
.event{
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--s-3);
  padding: var(--s-3);
  border: 1px solid rgba(255,255,255,0.10);
  background: rgba(255,255,255,0.035);
  border-radius: var(--radius-lg);
}
.event .time{
  color: rgba(245,246,247,0.85);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.event .title{
  font-weight: 750;
}
.event .meta{
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}
.event .pill{
  margin-top: 8px;
  display: inline-flex;
  gap: 8px;
  flex-wrap: wrap;
}
.pill span{
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.04);
  color: var(--muted);
  font-size: 12px;
}

/* ====== Venue ====== */
.venue{
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--s-3);
  align-items: start;
}
.map{
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}
.map iframe{
  width: 100%;
  height: 360px;
  border: 0;
  display: block;
}
.venue-side{
  display: grid;
  gap: var(--s-3);
}
.venue-photo{
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}
.venue-photo img{
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
}

.mini-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-3);
}
.mini-card{
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-lg);
  padding: var(--s-3);
}
.mini-card .label{
  color: var(--muted-2);
  font-size: 12px;
  margin-bottom: 6px;
}
.mini-card .value{
  font-weight: 750;
  font-size: 13px;
}

/* ====== Partners ====== */
.logo-grid{
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: var(--s-3);
  align-items: center;
}
.logo-tile{
  border: 1px solid rgba(255,255,255,0.10);
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-lg);
  padding: var(--s-4);
  display: grid;
  place-items: center;
  min-height: 110px;
  filter: grayscale(1) brightness(0.9);
  transition: filter 160ms ease, transform 160ms ease, border-color 160ms ease;
}
.logo-tile img{ max-height: 48px; width: auto; }
.logo-tile:hover{
  filter: grayscale(0) brightness(1);
  transform: translateY(-2px);
  border-color: rgba(212,175,55,0.20);
}

/* ====== Details / FAQ ====== */
details{
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-lg);
  padding: var(--s-3) var(--s-4);
}
details + details{ margin-top: var(--s-3); }
summary{
  cursor: pointer;
  font-weight: 760;
  color: rgba(245,246,247,0.92);
}
details p, details li{
  color: var(--muted);
  max-width: var(--measure);
}
details ul{
  margin: 10px 0 0;
  padding-left: 18px;
}

/* ====== Footer ====== */
.footer{
  padding: var(--s-6) 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  color: var(--muted);
}
.footer a{ color: rgba(245,246,247,0.88); text-decoration: underline; }
.footer .cols{
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--s-3);
}
.footer small{ color: var(--muted-2); }

/* ====== Sticky mobile CTA ====== */
.sticky-cta{
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 80;
  padding: 10px 12px;
  background: rgba(11,15,20,0.82);
  border-top: 1px solid rgba(255,255,255,0.10);
  backdrop-filter: blur(10px);
  display: none;
}
.sticky-cta .inner{
  width: min(var(--container), calc(100% - 2*var(--s-4)));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

/* ====== Focus / accessibility ====== */
:focus-visible{
  outline: 3px solid rgba(212,175,55,0.55);
  outline-offset: 3px;
  border-radius: 12px;
}

/* ====== Responsive ====== */
@media (max-width: 980px){
  .hero-grid{ grid-template-columns: 1fr; }
  .logo-panel{ order: 2; }
  .grid-3{ grid-template-columns: 1fr; }
  .grid-2{ grid-template-columns: 1fr; }
  .callout-inner{ grid-template-columns: 1fr; }
  .callout .row{ grid-template-columns: 1fr; }
  .speakers-grid{ grid-template-columns: repeat(2,1fr); }
  .venue{ grid-template-columns: 1fr; }
  .mini-grid{ grid-template-columns: 1fr; }
  .logo-grid{ grid-template-columns: repeat(2,1fr); }
  .nav{ height:auto; flex-wrap: wrap; padding: 10px 0; }
  .navlinks{
    display: flex;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: var(--s-2);
    padding-bottom: 6px;
  }
  .navlinks::-webkit-scrollbar{ display:none; }
  .navlinks a{ white-space: nowrap; }
  .sticky-cta{ display: block; }
  .event{ grid-template-columns: 1fr; }
}

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


/* ====== Logo stack (hero) ====== */
.logo-strip.logo-stack{
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  align-items: center;
  justify-content: center;
}
.logo-strip.logo-stack .logo-item{
  width: 100%;
  max-width: 360px;
  height: 72px;
  object-fit: contain;
  opacity: 0.96;
  filter: saturate(1.05);
}
/* Boost the wide text-heavy logos so their optical size matches the crests */
.logo-strip.logo-stack .logo-item.logo-boost{
  height: 86px;
}
@media (max-width: 520px){
  .logo-strip.logo-stack{ gap: var(--s-2); }
  .logo-strip.logo-stack .logo-item{ height: 64px; max-width: 320px; }
  .logo-strip.logo-stack .logo-item.logo-boost{ height: 76px; }
}