body {
  margin: 0;
  background: #0f172a;
  color: white;
  font-family: sans-serif;
  text-align: center;
}

.hero {
  padding-top: 100px; /* 위에서 살짝 내려오기 */
  text-align: center;
}
.hero h1 {
  font-size: 65px;
  margin-bottom: 10px;
}

.hero p {
  font-size: 20px;
}

/* 검색 */
.search-box {
  margin-top: 20px;
}

input {
  padding: 10px;
  width: 250px;
  border-radius: 10px;
  border: none;
}

button {
  padding: 10px 15px;
  margin-left: 10px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
}

/* ✅ 기본 상태 (숨김 + 카드 디자인 포함) */
.big-card {
  width: 70%;
  margin: 100px auto;
  padding: 40px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.05);

  opacity: 0;
  transform: translateY(40px);
  transition: all 0.6s ease;
}

.small-card {
  margin: 15px 0;
  padding: 15px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);

  opacity: 0;
  transform: translateY(30px);
  transition: all 0.5s ease;
}

/* ✅ 스크롤 들어오면 등장 */
.big-card.show {
  opacity: 1;
  transform: translateY(0);
}

.small-card.show {
  opacity: 1;
  transform: translateY(0);
}

/* ✅ 링크 카드 */
.link-card {
  text-decoration: none;
  color: inherit;
  display: block;
}

/* ✅ hover 효과 */
.small-card:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.12);
}

/* ✅ 검색 숨김 */
.hidden {
  display: none;
}

/* ✅ TOP 버튼 */
#topBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  display: none;
  font-size: 20px;
  padding: 10px 15px;
  border-radius: 10px;
  background: #1e293b;
  color: white;
  border: none;
  cursor: pointer;
}

#topBtn:hover {
  background: #38bdf8;
  color: black;
}