* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  font-family: "Segoe UI", Arial, sans-serif;
  color: #ffffff;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    radial-gradient(circle at top, rgba(50, 120, 255, 0.18), transparent 35%),
    radial-gradient(circle at bottom right, rgba(130, 80, 255, 0.15), transparent 40%),
    #05070d;
  background-size: 48px 48px, 48px 48px, cover, cover, cover;
  overflow-x: hidden;
}

.presentation-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
}

.presentation-container {
  position: relative;
  width: min(1050px, 100%);
  padding: 55px 28px 60px;
  text-align: center;
  border-radius: 34px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(20px);
  box-shadow:
    0 0 80px rgba(80, 130, 255, 0.12),
    0 35px 90px rgba(0, 0, 0, 0.65),
    inset 0 0 30px rgba(255, 255, 255, 0.035);
  overflow: hidden;
}

.presentation-container::before {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: 33px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  pointer-events: none;
}

.presentation-container::after {
  content: "";
  position: absolute;
  width: 140%;
  height: 1px;
  top: 0;
  left: -20%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.8),
    transparent
  );
  animation: scan 5s linear infinite;
  opacity: 0.45;
}

@keyframes scan {
  0% {
    top: 0;
  }

  100% {
    top: 100%;
  }
}

h1 {
  position: relative;
  z-index: 2;
  margin-bottom: 45px;
  color: #ffffff;
  font-size: clamp(2.6rem, 6vw, 5rem);
  font-weight: 800;
  letter-spacing: 4px;
  text-transform: uppercase;
  text-shadow:
    0 0 12px rgba(255, 255, 255, 0.28),
    0 0 30px rgba(255, 255, 255, 0.12);
}

.video-box {
  position: relative;
  z-index: 2;
  width: min(820px, 100%);
  aspect-ratio: 16 / 9;
  margin: 0 auto;
  padding: 12px;
  border-radius: 26px;
  background: rgba(8, 12, 24, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.04),
    0 0 35px rgba(80, 140, 255, 0.18),
    0 0 70px rgba(115, 80, 255, 0.12),
    0 25px 70px rgba(0, 0, 0, 0.72);
}

.video-box::before {
  content: "";
  position: absolute;
  inset: -2px;
  z-index: -1;
  border-radius: 28px;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.7),
    rgba(80, 140, 255, 0.22),
    rgba(145, 95, 255, 0.25),
    rgba(255, 255, 255, 0.45)
  );
  opacity: 0.65;
  filter: blur(1px);
}

.video-box::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 17px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  pointer-events: none;
}

video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  border-radius: 17px;
  background: #000;
}

.corner {
  position: absolute;
  width: 34px;
  height: 34px;
  z-index: 3;
  border-color: rgba(255, 255, 255, 0.85);
}

.top-left {
  top: -1px;
  left: -1px;
  border-top: 2px solid;
  border-left: 2px solid;
  border-radius: 22px 0 0 0;
}

.top-right {
  top: -1px;
  right: -1px;
  border-top: 2px solid;
  border-right: 2px solid;
  border-radius: 0 22px 0 0;
}

.bottom-left {
  bottom: -1px;
  left: -1px;
  border-bottom: 2px solid;
  border-left: 2px solid;
  border-radius: 0 0 0 22px;
}

.bottom-right {
  bottom: -1px;
  right: -1px;
  border-bottom: 2px solid;
  border-right: 2px solid;
  border-radius: 0 0 22px 0;
}

.identity {
  position: relative;
  z-index: 2;
  margin-top: 42px;
}

.identity h2 {
  color: #ffffff;
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: 1px;
  text-shadow: 0 0 16px rgba(255, 255, 255, 0.16);
}

.identity p {
  margin-top: 12px;
  color: #ffffff;
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 300;
  letter-spacing: 0.8px;
  opacity: 0.9;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.42;
  pointer-events: none;
}

.glow-blue {
  width: 260px;
  height: 260px;
  top: -90px;
  left: -70px;
  background: rgba(70, 130, 255, 0.75);
}

.glow-purple {
  width: 280px;
  height: 280px;
  right: -90px;
  bottom: -110px;
  background: rgba(130, 80, 255, 0.65);
}

@media (max-width: 700px) {
  .presentation-page {
    padding: 30px 14px;
  }

  .presentation-container {
    padding: 38px 15px 45px;
    border-radius: 26px;
  }

  h1 {
    margin-bottom: 32px;
    letter-spacing: 2px;
  }

  .video-box {
    padding: 8px;
    border-radius: 20px;
  }

  video {
    border-radius: 13px;
  }

  .video-box::after {
    inset: 8px;
    border-radius: 13px;
  }

  .identity {
    margin-top: 32px;
  }
}