.index-section {
  background: #F2E0D8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.back-btn {
  position: fixed;
  top: 30px;
  left: 30px;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(242, 224, 216, 0.85);
  backdrop-filter: blur(8px);
  color: #5F1022;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  text-decoration: none;
  border: 1px solid rgba(95, 16, 34, 0.2);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
}

.back-btn:hover {
  background: rgba(242, 224, 216, 0.95);
  border-color: rgba(95, 16, 34, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
  color: #8a1732;
}

.back-btn webp {
  transition: transform 0.3s ease;
}

.back-btn:hover webp {
  transform: translateX(-4px);
}

.event-card {
  width: 90%;
  max-width: 1320px;
  padding: 20px;
  background: #000;
  border-radius: 60px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.55);
  position: relative;
}

.event-shape {
  --r: 50px;
  --s: 50px;
  --x: 300px;
  --y: 0px;

  position: relative;
  z-index: 1;
  height: 560px;
  overflow: hidden;
  border-radius: var(--r);

  --_m: /calc(2*var(--r)) calc(2*var(--r)) radial-gradient(#000 70%, #0000 72%);
  --_g: conic-gradient(from 180deg at var(--r) calc(100% - var(--r)),
      #0000 25%, #000 0);
  --_d: (var(--s) + var(--r));

  mask:
    calc(var(--_d) + var(--x)) 100% var(--_m),
    0 calc(100% - var(--_d) - var(--y)) var(--_m),
    radial-gradient(var(--s) at 0 100%,
      #0000 99%, #000 calc(100% + 1px)) calc(var(--r) + var(--x)) calc(-1 * var(--r) - var(--y)),
    var(--_g) calc(var(--_d) + var(--x)) 0,
    var(--_g) 0 calc(-1 * var(--_d) - var(--y));

  mask-repeat: no-repeat;
}

.event-shape img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.event-shape::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  mask: inherit;
}

.event-shape::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center,
      rgba(0, 0, 0, 0) 35%,
      rgba(0, 0, 0, 0.65) 100%);
}

.countdown {
  position: absolute;
  bottom: 0;
  padding: 20px 10px;
  width: 350px;
  height: 20%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.countdown-label {
  font-size: 15px;
  letter-spacing: 2px;
  opacity: 0.8;
  margin-bottom: 5px;
}

.time {
  font-size: 40px;
  font-weight: 500;
  color: #ffffff;
  font-variant-numeric: tabular-nums;
}

.page-title {
  font-size: 48px;
  margin-bottom: 30px;
  font-weight: 600;
  color: #5F1022;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.tagline {
  margin-top: 30px;
  max-width: 900px;
  text-align: center;
  font-size: 22px;
  color: #5F1022;
  line-height: 1.3;
}

@media (max-width: 900px) {
  .event-image img {
    height: 280px;
  }

  .countdown {
    bottom: 20px;
    left: 20px;
  }

  .time {
    font-size: 30px;
  }

  .page-title {
    font-size: 34px;
  }
}

@media (max-width: 768px) {
  .index-section {
    padding: 40px 20px;
  }

  .page-title {
    font-size: 38px;
    margin-bottom: 25px;
  }

  .event-card {
    width: 95%;
    padding: 15px;
    border-radius: 45px;
  }

  .event-shape {
    height: 460px;
    --r: 40px;
    --s: 40px;
    --x: 240px;
  }

  .countdown {
    bottom: 0;
    width: 240px;
    padding: 10px 20px;
  }

  .countdown-label {
    font-size: 11px;
    letter-spacing: 1px;
  }

  .time {
    font-size: 28px;
  }

  .tagline {
    font-size: 18px;
    margin-top: 25px;
    padding: 0 20px;
    max-width: 700px;
  }
}

@media (max-width: 480px) {
  .index-section {
    padding: 20px 10px;
    justify-content: flex-start;
    min-height: auto;
  }

  .page-title {
    font-size: 28px;
    margin-bottom: 20px;
    margin-top: 50px;
  }

  .event-card {
    padding: 10px;
    border-radius: 30px;
    width: 100%;
  }

  .event-shape {
    height: 380px;
    --r: 30px;
    --s: 40px;
    --x: 180px;
  }

  .countdown {
    bottom: 0;
    left: 0;
    transform: none;
    width: 230px;
    background: transparent;
    padding: 10px;
  }

  .countdown-label {
    font-size: 10px;
    letter-spacing: 1px;
    margin-bottom: 2px;
  }

  .time {
    font-size: 20px;
    letter-spacing: 2px;
  }

  .tagline {
    font-size: 13px;
    margin-top: 50px;
    padding: 0 10px;
  }

  .back-btn {
    width: 35px;
    height: 35px;
  }
}