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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  font-family: 'Segoe UI', sans-serif;
}

/* 선택 화면 */
#select-screen {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  gap: 48px;
}

#select-screen h1 {
  color: #fff;
  font-size: 2rem;
  font-weight: 300;
}

.button-group {
  display: flex;
  gap: 32px;
}

.button-group button {
  width: 200px;
  height: 260px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

#btn-vertical {
  width: 160px;
  height: 260px;
}

#btn-horizontal {
  width: 280px;
  height: 180px;
}

.button-group button:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.6);
  transform: scale(1.05);
}

/* 슬라이더 화면 */
#slider-screen {
  width: 100vw;
  height: 100vh;
  position: relative;
}

#slider-container {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
}

#slider-track {
  display: flex;
  height: 100%;
  transition: transform 1s ease-in-out;
}

#slider-track img {
  width: 100vw;
  height: 100vh;
  object-fit: contain;
  flex-shrink: 0;
  background: #000;
}

.hidden {
  display: none !important;
}