body {
  font-family: 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  background: #f9f9fc;
  color: #333;
  margin: 0;
  padding: 0;
}

/* 컨테이너가 버튼 아래에서 시작하도록 충분한 여백 확보 */
.container {
  max-width: 720px;
  margin: 100px auto 20px;
  padding: 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

h1 {
  font-size: 1.8em;
  margin-bottom: 10px;
}

textarea {
  width: 100%;
  height: 200px;
  padding: 12px;
  font-size: 1em;
  border: 1px solid #ccc;
  border-radius: 8px;
  resize: vertical;
  box-sizing: border-box;
}

.button-group {
  margin-top: 10px;
  text-align: right;
}

button#copyBtn {
  padding: 8px 14px;
  font-size: 0.95em;
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button#copyBtn:hover {
  background-color: #45a045;
}

.result-box {
  margin-top: 20px;
  background: #f2f3f7;
  padding: 15px;
  border-radius: 8px;
  font-size: 1.1em;
  line-height: 1.6;
}

/* ← 다른 도구 더 보기 버튼 */
.home-button {
  position: fixed;
  top: 12px;               /* 상단에서 약간 내려오도록 */
  left: 0;
  right: 0;
  margin: auto;
  width: fit-content;
  padding: 14px 24px;      /* 버튼 크기 확대 */
  background-color: #0066cc;
  color: #fff;
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1.3em;
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3); /* 진한 그림자 */
  overflow: hidden;         /* shine 이펙트가 밖으로 넘치지 않도록 */
  transition: background-color 0.3s, transform 0.2s, box-shadow 0.3s;
  z-index: 999;
}

.home-button:hover {
  background-color: #004999;
  transform: translateY(-3px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
}

.home-button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -75%;
  width: 50%;
  height: 100%;
  background: rgba(255,255,255,0.4);
  transform: skewX(-30deg);
  animation: shine 3s infinite;
}

@keyframes shine {
  0%   { left: -75%; }
  50%  { left: 125%; }
  100% { left: -75%; }
}

/* 반응형 대응 */
@media (max-width: 600px) {
  .container {
    margin: 80px 10px 20px;
    padding: 15px;
  }

  textarea {
    height: 150px;
  }

  button#copyBtn {
    width: 100%;
    margin-top: 8px;
  }

  .button-group {
    text-align: center;
  }

  .home-button {
    font-size: 1.1em;
    padding: 10px 16px;
    top: 10px;
  }
}