/* STRATUM Self-Hosted Minimal Landing Page
   Replace:
   - assets/stratum-logo-white.svg
   - assets/background.jpg
   - Playglobal URL in index.html
*/

:root {
  --bg: #050505;
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.72);
  --soft: rgba(255, 255, 255, 0.42);
  --gold: rgba(205, 170, 92, 0.52);
  --overlay-strong: rgba(0, 0, 0, 0.62);
  --overlay-soft: rgba(0, 0, 0, 0.18);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  overflow: hidden;
}

.entry-page {
  position: relative;
  width: 100vw;
  height: 100svh;
  min-height: 620px;
  overflow: hidden;
  isolation: isolate;
  background: #050505;
}

/* Background image fallback */
.background-image {
  position: absolute;
  inset: 0;
  z-index: -5;
  background-image: url("assets/bg_3.png");
  background-size: cover;
  background-position: center;
  transform: scale(1.035);
  filter: saturate(0.88) contrast(1.08) brightness(0.84);
  animation: backgroundReveal 1800ms ease-out forwards, slowDrift 18s ease-in-out infinite alternate;
}

/* Optional video background */
.background-video {
  position: absolute;
  inset: 0;
  z-index: -6;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.08) brightness(0.82);
}

.overlay {
  position: absolute;
  inset: 0;
  z-index: -4;
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.055), transparent 28%),
    radial-gradient(circle at 50% 112%, var(--gold), transparent 34%),
    linear-gradient(180deg, var(--overlay-soft) 0%, var(--overlay-strong) 100%),
    rgba(0, 0, 0, 0.34);
}

.grain {
  position: absolute;
  inset: -40%;
  z-index: -3;
  pointer-events: none;
  opacity: 0.075;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.28) 0 1px, transparent 1px),
    radial-gradient(circle at 70% 80%, rgba(255,255,255,0.18) 0 1px, transparent 1px);
  background-size: 3px 3px, 5px 5px;
  animation: grainMove 7s steps(6) infinite;
}

.content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 28px 96px;
  text-align: center;
}

.logo {
  width: min(450px, 58vw);
  max-height: 250px;
  object-fit: contain;
  opacity: 0;
  transform: translateY(10px);
  filter: drop-shadow(0 18px 55px rgba(0, 0, 0, 0.42));
  animation: fadeUp 900ms ease-out 420ms forwards;
}

.claim {
  margin: 28px 0 0;
  max-width: 720px;
  font-size: clamp(15px, 1.45vw, 22px);
  font-weight: 300;
  line-height: 1.55;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0;
  transform: translateY(8px);
  animation: fadeUp 900ms ease-out 800ms forwards;
}

.footer-link {
  position: absolute;
  left: 50%;
  bottom: clamp(28px, 5vh, 54px);
  transform: translateX(-50%);
  opacity: 0;
  animation: footerIn 900ms ease-out 1250ms forwards;
}

.footer-link a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--soft);
  text-decoration: none;
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  transition: color 220ms ease, transform 220ms ease, letter-spacing 220ms ease;
}

.footer-link a:hover,
.footer-link a:focus-visible {
  color: #ffffff;
  transform: translateY(-2px);
  letter-spacing: 0.28em;
  outline: none;
}

.footer-link span {
  font-size: 14px;
  transform: translateY(-1px);
}

@keyframes backgroundReveal {
  from {
    opacity: 0;
    transform: scale(1.08);
  }
  to {
    opacity: 1;
    transform: scale(1.035);
  }
}

@keyframes slowDrift {
  from {
    transform: scale(1.035) translate3d(-0.4%, -0.2%, 0);
  }
  to {
    transform: scale(1.07) translate3d(0.45%, 0.35%, 0);
  }
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes footerIn {
  to {
    opacity: 1;
  }
}

@keyframes grainMove {
  0% { transform: translate3d(0, 0, 0); }
  20% { transform: translate3d(-3%, 2%, 0); }
  40% { transform: translate3d(2%, -4%, 0); }
  60% { transform: translate3d(-4%, -2%, 0); }
  80% { transform: translate3d(4%, 3%, 0); }
  100% { transform: translate3d(0, 0, 0); }
}

@media (max-width: 720px) {
  .entry-page {
    min-height: 540px;
  }

  .claim {
    max-width: 310px;
    font-size: 12px;
    letter-spacing: 0.16em;
  }

  .footer-link a {
    font-size: 10px;
    letter-spacing: 0.18em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .background-image,
  .grain,
  .logo,
  .claim,
  .footer-link {
    animation: none;
  }

  .logo,
  .claim,
  .footer-link {
    opacity: 1;
    transform: none;
  }

  .background-image {
    opacity: 1;
    transform: scale(1.035);
  }
}