:root {
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro KR",
    Pretendard, "Noto Sans KR", sans-serif;
  background: #050b12;
  color: #f5f5f7;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  background: #050b12;
}

body {
  position: relative;
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 50% 24%, rgba(21, 101, 192, 0.18), transparent 34rem),
    linear-gradient(180deg, #08131f 0%, #050b12 52%, #03070b 100%);
}

.network-ambient {
  position: absolute;
  z-index: 0;
  top: 0;
  left: 50%;
  width: max(100%, 1440px);
  height: min(1000px, 100svh);
  overflow: visible;
  pointer-events: none;
  transform: translateX(-50%);
}

.network-lines {
  fill: none;
  stroke: rgba(33, 150, 243, 0.34);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.network-lines circle {
  fill: #4fdcca;
  stroke: rgba(103, 232, 249, 0.55);
  stroke-width: 5;
  filter: drop-shadow(0 0 7px #24a7ff);
}

.site-shell {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 48px));
  min-height: 100svh;
  margin: 0 auto;
}

.hero {
  display: flex;
  min-height: calc(100svh - 220px);
  align-items: center;
  flex-direction: column;
  justify-content: center;
  padding: 64px 0 54px;
}

.brand-copy {
  margin-bottom: 30px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: #68d9ff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.32em;
}

h1 {
  margin: 0;
  font-size: clamp(2.35rem, 5vw, 4.7rem);
  font-weight: 720;
  letter-spacing: -0.055em;
  line-height: 1.06;
}

.tagline {
  margin: 14px 0 0;
  color: rgba(245, 245, 247, 0.58);
  font-size: clamp(1rem, 1.8vw, 1.3rem);
  letter-spacing: -0.02em;
}

.launch-note {
  display: inline-flex;
  align-items: center;
  margin-top: 22px;
  overflow: hidden;
  border: 1px solid rgba(112, 235, 217, 0.2);
  border-radius: 999px;
  background: rgba(6, 20, 33, 0.58);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.04), 0 10px 28px rgba(0, 0, 0, 0.16);
  color: rgba(245, 245, 247, 0.67);
  font-size: 0.66rem;
  font-weight: 650;
  letter-spacing: 0.12em;
  backdrop-filter: blur(12px);
}

.launch-status,
.launch-date {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
}

.launch-status {
  gap: 7px;
  border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.launch-status i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #5ce1ce;
  box-shadow: 0 0 9px rgba(92, 225, 206, 0.95);
}

.launch-date {
  color: #75e7d5;
  letter-spacing: 0.16em;
}

.video-frame {
  position: relative;
  width: min(100%, 1040px);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 26px;
  background: #000;
  box-shadow:
    0 38px 100px rgba(0, 0, 0, 0.55),
    0 0 60px rgba(24, 119, 242, 0.13);
}

.video-frame::before {
  position: absolute;
  z-index: 1;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.08);
  content: "";
  pointer-events: none;
}

video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  object-fit: contain;
}

.sound-toggle {
  position: absolute;
  z-index: 2;
  right: 16px;
  bottom: 48px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(3, 10, 17, 0.72);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
  color: #fff;
  font: inherit;
  font-size: 0.74rem;
  font-weight: 650;
  cursor: pointer;
  backdrop-filter: blur(12px);
}

.sound-toggle:hover {
  border-color: rgba(112, 235, 217, 0.55);
  background: rgba(7, 29, 43, 0.88);
}

.sound-toggle[hidden] {
  display: none;
}

.site-footer {
  padding: 34px 0 42px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(245, 245, 247, 0.48);
  font-size: 0.76rem;
  line-height: 1.7;
}

.footer-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
}

.footer-top strong {
  color: rgba(245, 245, 247, 0.82);
  font-size: 0.84rem;
  font-weight: 600;
}

.footer-top a {
  color: rgba(245, 245, 247, 0.68);
  text-decoration: none;
  transition: color 160ms ease;
}

.footer-top a:hover {
  color: #fff;
}

.company-details {
  display: flex;
  flex-wrap: wrap;
  margin-top: 12px;
  gap: 2px 0;
}

.company-details span:not(:last-child)::after {
  margin: 0 10px;
  color: rgba(255, 255, 255, 0.18);
  content: "|";
}

.copyright {
  margin: 8px 0 0;
}

@media (max-width: 640px) {
  .network-ambient {
    left: 0;
    width: 100%;
    opacity: 0.62;
    transform: none;
  }

  .site-shell {
    width: min(100% - 32px, 1180px);
  }

  .hero {
    min-height: auto;
    padding: 70px 0 48px;
  }

  .brand-copy {
    margin-bottom: 24px;
  }

  .launch-note {
    margin-top: 18px;
    font-size: 0.58rem;
  }

  .launch-status,
  .launch-date {
    padding: 7px 9px;
  }

  .video-frame {
    border-radius: 16px;
  }

  .sound-toggle {
    right: 10px;
    bottom: 42px;
    padding: 7px 10px;
    font-size: 0.66rem;
  }

  .site-footer {
    padding: 28px 0 34px;
  }

  .footer-top {
    align-items: flex-start;
    flex-direction: column;
    gap: 3px;
  }

  .company-details {
    align-items: flex-start;
    flex-direction: column;
    margin-top: 14px;
  }

  .company-details span::after {
    display: none;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .brand-copy,
  .video-frame {
    animation: rise 800ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
  }

  .network-lines circle {
    animation: node-pulse 3.2s ease-in-out infinite alternate;
  }

  .network-right circle {
    animation-delay: -1.4s;
  }

  .video-frame {
    animation-delay: 100ms;
  }

  @keyframes rise {
    from {
      opacity: 0;
      transform: translateY(18px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes node-pulse {
    from { opacity: 0.45; }
    to { opacity: 1; }
  }
}