* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Serif KR", serif;
  color: #4b3a3f;
  background: #fff5f7;
}

section {
  min-height: 100vh;
}

/* 공통 버튼 */

button {
  border: none;
  background: linear-gradient(135deg, #e998ab, #d97891);
  color: white;
  padding: 15px 30px;
  border-radius: 50px;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(180, 100, 120, 0.25);
  transition: 0.25s;
}

button:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 25px rgba(180, 100, 120, 0.35);
}

button:active {
  transform: scale(0.96);
}


/* 첫 화면 */

.cover {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 30px;
  background:
    radial-gradient(circle at top left, #ffffff 0%, transparent 35%),
    linear-gradient(135deg, #fff1f5, #ffe1e9);
}

.heart {
  font-size: 100px;
  color: #db8298;
  animation: float 2.5s ease-in-out infinite;
  margin-bottom: 20px;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-12px);
  }
}

.cover h1 {
  font-size: 40px;
  margin: 0 0 18px;
  font-weight: 500;
}

.cover p {
  line-height: 1.9;
  color: #8b7078;
  margin-bottom: 35px;
}


/* 사진 */

.photos {
  display: none;
  padding: 80px 25px;
  text-align: center;
  background: #fffaf8;
}

.small-title {
  font-size: 11px;
  letter-spacing: 4px;
  color: #c28b98;
  margin-bottom: 15px;
}

.photos h2,
.letter h2,
.final h2 {
  font-size: 30px;
  font-weight: 500;
  margin-bottom: 50px;
}

.photo-box {
  max-width: 520px;
  margin: 0 auto 20px;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 12px 35px rgba(80, 40, 50, 0.12);
}

.photo-box img {
  display: block;
  width: 100%;
  height: auto;
}

.photo-text {
  color: #806970;
  font-size: 15px;
  margin: 0 auto 65px;
}


/* 편지 */

.letter {
  display: none;
  padding: 80px 25px;
  background: #fffdf9;
  text-align: center;
}

.letter-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: left;
  font-size: 17px;
  line-height: 2.1;
}

.letter-content p {
  margin-bottom: 30px;
}

.from {
  text-align: right;
  margin-top: 60px;
  color: #80636b;
}

.letter button {
  margin-top: 50px;
}


/* 마지막 */

.final {
  display: none;
  min-height: 100vh;
  padding: 80px 25px;
  text-align: center;
  background:
    radial-gradient(circle at center, #fff 0%, transparent 40%),
    linear-gradient(135deg, #ffe8ee, #fff5f7);
}

.final-heart {
  font-size: 65px;
  color: #d97891;
  margin-bottom: 25px;
}

.final-message {
  max-width: 550px;
  margin: 0 auto;
  line-height: 2;
  color: #725c62;
}

.big-message {
  font-size: 28px;
  line-height: 1.7;
  color: #c96880;
  margin: 50px 0;
}

.love {
  font-size: 30px;
  color: #d97891;
  margin-top: 60px;
}

.final button {
  margin-top: 60px;
}


/* 모바일 */

@media (max-width: 600px) {

  .cover h1 {
    font-size: 32px;
  }

  .heart {
    font-size: 80px;
  }

  .photos,
  .letter,
  .final {
    padding: 65px 20px;
  }

  .photos h2,
  .letter h2,
  .final h2 {
    font-size: 25px;
  }

  .letter-content {
    font-size: 16px;
  }

  .big-message {
    font-size: 25px;
  }
}