/* 기본 스타일 */
body {
  font-family: "Noto Sans KR", sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
  color: #222;
}

header {
  background: #4cafef;
  color: white;
  padding: 40px 20px;
}

/* product page header layout */
.page-header {
  position: relative;
}

.page-header-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

.page-title {
  margin: 0;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: #fff;
  font-weight: 700;
}

.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.35);
  font-size: 12px;
  letter-spacing: 0.5px;
}

/* 네비게이션 바 */
.navbar {
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  flex-wrap: wrap;
  font-size: 1.1rem;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid rgba(30, 58, 138, 0.18);
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}
.navbar .nav-links {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex: 1;
  flex-wrap: wrap;
}

.navbar .auth-area {
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.navbar .auth-email {
  color: #1e3a8a;
  font-weight: 600;
  font-size: 0.95rem;
}
.navbar a {
  color: #1e3a8a;
  text-decoration: none;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 10px;
  transition: background 0.2s ease, color 0.2s ease;
}
.navbar a:hover {
  background: rgba(30, 58, 138, 0.12);
  color: #1e40af;
  opacity: 1;
}

section {
  padding: 40px 20px;
  border-bottom: 1px solid #eee;
}

h1, h2 {
  margin-bottom: 10px;
}

p {
  margin: 10px 0;
  line-height: 1.6;
}

/* 다운로드 버튼 */
.download a {
  display: inline-block;
  margin: 10px;
  padding: 12px 20px;
  background: #333;
  color: white;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.3s;
}

.download a:hover {
  background: #555;
}

/* 이미지 반응형 */
section img {
  width: 100%;
  height: auto;
  max-width: 800px;   /* 데스크탑에서는 800px까지만 표시 */
  margin: 20px auto;
  display: block;
  border-radius: 12px;
  object-fit: contain;
}

/* 푸터 */
footer {
  background: #111;
  color: #ccc;
  padding: 20px;
  font-size: 0.9em;
}

/* ======================================
   📱 반응형 (모바일 & 태블릿 대응)
====================================== */
@media (max-width: 1024px) {
  header {
    padding: 30px 15px;
  }

  h1 {
    font-size: 1.8em;
  }

  h2 {
    font-size: 1.4em;
  }

  section {
    padding: 30px 15px;
  }
}

@media (max-width: 768px) {
  header {
    padding: 25px 10px;
  }

  h1 {
    font-size: 1.6em;
  }

  p {
    font-size: 1em;
  }

  .download a {
    display: block;
    width: 80%;
    margin: 10px auto;
  }

  section img {
    max-width: 100%;
    border-radius: 8px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.4em;
  }

  section {
    padding: 25px 10px;
  }

  footer {
    font-size: 0.8em;
  }
}