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

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 0, 92, 0.22), transparent 30%),
    radial-gradient(circle at 20% 85%, rgba(255,255,255,0.08), transparent 28%),
    #050505;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
  overflow-x: hidden;
}

.back-btn {
  position: fixed;
  top: 25px;
  left: 25px;
  z-index: 10;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(20,20,20,0.85);
  border: 1px solid rgba(255,255,255,0.14);
  color: #fff;
  font-size: 12px;
  font-weight: 900;
  cursor: pointer;
}

.collage-page {
  min-height: 100vh;
  width: min(94%, 1200px);
  margin: 0 auto;
  padding: 85px 20px 50px;
}

.header {
  text-align: center;
  margin-bottom: 38px;
}

.header p {
  color: #ff005c;
  letter-spacing: 4px;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 900;
  margin-bottom: 10px;
}

.header h1 {
  font-size: clamp(36px, 6vw, 62px);
  font-weight: 900;
  letter-spacing: -2px;
}

.header h1::after {
  content: "";
  display: block;
  width: 170px;
  height: 5px;
  margin: 14px auto 0;
  background: #ff005c;
  box-shadow: 0 0 20px rgba(255,0,92,0.7);
}

.collage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  justify-items: center;
}

.collage video {
  width: min(100%, 900px);
  height: auto;
  object-fit: cover;
  border-radius: 28px;
  display: block;
  background: #111;
  box-shadow:
    0 25px 65px rgba(0,0,0,0.55),
    0 0 35px rgba(255,0,92,0.18);
  transition: 0.3s ease;
}

.collage video:hover {
  transform: scale(1.02);
  box-shadow:
    0 30px 80px rgba(0,0,0,0.65),
    0 0 45px rgba(255,0,92,0.35);
}

/* PREVIEW MODE */
.preview-mode {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.preview-mode .back-btn,
.preview-mode .header {
  display: none;
}

.preview-mode .collage-page {
  width: 100%;
  height: 100vh;
  padding: 0;
  overflow: hidden;
}

.preview-mode .collage {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 0;
  position: relative;
}

.preview-mode .collage video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  box-shadow: none;
  filter: brightness(0.72) saturate(1.15);
  transform: none;
}

.preview-mode .collage video:hover {
  transform: none;
  box-shadow: none;
}

.preview-mode .collage::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, transparent 35%, rgba(0,0,0,0.85)),
    radial-gradient(circle at 70% 20%, rgba(255,0,92,0.25), transparent 45%);
  pointer-events: none;
}

@media (max-width: 850px) {
  .collage video {
    width: 100%;
  }
}