/* ========================================
   全ページ共通 ヘッダー・フッター
   TOPページとコースページで共用
   ======================================== */

/* --- Header Base --- */
header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  transition: background-color 0.3s ease, padding 0.3s ease, box-shadow 0.3s ease;
}

/* TOPページ用: スクロール時 */
header.scrolled {
  background-color: rgba(51, 51, 51, 0.95);
  padding: 15px 40px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

/* サブページ用: 常に白背景・ダークテキスト */
header.header-light,
header.header-light.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  color: #333;
  box-shadow: 0 1px 10px rgba(0,0,0,0.05);
  padding: 20px 40px;
}

header.header-light.scrolled {
  padding: 15px 40px;
  box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

header.header-light .logo,
header.header-light .logo a,
header.header-light nav a,
header.header-light .main-menu a {
  color: #333 !important;
}

header.header-light .hamburger span {
  background-color: #333 !important;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  font-family: 'Lato', sans-serif;
  z-index: 101;
}

.logo a { text-decoration: none; color: inherit; }

/* Navigation PC */
nav { transition: all 0.4s ease; }
.mobile-mypage-btn, .nav-divider, .sub-menu-group { display: none; }

nav ul {
  display: flex;
  list-style: none;
  gap: 25px;
  align-items: center;
}

nav li {
  font-size: 13px;
  font-family: 'Lato', sans-serif;
  font-weight: 300;
  letter-spacing: 1px;
  cursor: pointer;
  opacity: 0.9;
}

nav a { text-decoration: none; color: inherit; }
nav a:hover { opacity: 0.8; }

header.header-light nav a:hover { color: #6c9a93; }

/* Hamburger */
.hamburger {
  display: none;
  cursor: pointer;
  z-index: 101;
  width: 30px;
  height: 20px;
  position: relative;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #fff;
  position: absolute;
  transition: all 0.3s ease;
}

.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.hamburger span:nth-child(3) { bottom: 0; }

/* --- Footer --- */
.site-footer {
  position: relative;
  width: 100%;
  background: linear-gradient(135deg, #a4c9c4 0%, #9bbdb8 100%);
  padding: 80px 20px 40px;
  color: #fff;
  overflow: hidden;
}

.footer-container {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer-logo {
  font-family: 'Quicksand', sans-serif;
  font-size: 48px;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 40px;
  color: #fff;
}

.footer-logo a { text-decoration: none; color: inherit; }

.footer-nav { margin-bottom: 40px; width: 100%; }

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px 40px;
}

.footer-links li a {
  text-decoration: none;
  color: #fff;
  font-family: 'Noto Serif JP', serif;
  font-size: 13px;
  letter-spacing: 0.1em;
  font-weight: 500;
  transition: opacity 0.3s;
  white-space: nowrap;
}

.footer-links li a:hover { opacity: 0.7; }

.footer-sns {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.sns-link { display: block; transition: opacity 0.3s; }
.sns-link:hover { opacity: 0.7; }

.sns-link img {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  object-fit: cover;
  display: block;
}

.footer-copyright {
  font-family: 'Lato', sans-serif;
  font-size: 11px;
  letter-spacing: 0.05em;
  opacity: 0.9;
  margin-bottom: 40px;
}

.footer-banner { width: 100%; max-width: 900px; }

.footer-banner a { display: block; transition: opacity 0.3s; }
.footer-banner a:hover { opacity: 0.8; }

.footer-banner img {
  width: 100%;
  height: auto;
  display: block;
}

/* ========================================
   Header & Footer Responsive (768px以下)
   ======================================== */
header.active .logo,
header.active .logo a { color: #333 !important; }
header.active .hamburger span { background-color: #333 !important; }

@media (max-width: 768px) {
  .mobile-mypage-btn, .nav-divider, .sub-menu-group { display: block; }

  header { padding: 15px 20px; }
  header.scrolled { padding: 10px 20px; }
  header.header-light,
  header.header-light.scrolled { padding: 15px 20px; }
  header.header-light.scrolled { padding: 10px 20px; }

  .hamburger { display: block; z-index: 200; }

  nav {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100vh;
    background: #fff;
    color: #333;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    z-index: 150;
    padding-top: 80px;
    overflow-y: auto;
    transition: opacity 0.3s, transform 0.3s;
  }

  nav.active {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-inner {
    padding: 0 30px 50px;
    display: flex;
    flex-direction: column;
  }

  .mobile-mypage-btn {
    display: block;
    width: 100%;
    text-align: center;
    border: 1px solid #6c9a93;
    color: #6c9a93;
    padding: 12px 0;
    font-family: 'Noto Serif JP', serif;
    letter-spacing: 2px;
    font-size: 14px;
    margin-bottom: 30px;
  }

  ul.main-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    width: 100%;
    padding: 10px 0;
    margin-bottom: 40px;
    list-style: none;
  }

  ul.main-menu li {
    width: 100%;
    text-align: center;
    font-family: 'Noto Serif JP', serif;
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: #333;
    border-bottom: 1px solid #eee;
    padding: 18px 0;
  }

  ul.main-menu li:last-child {
    border-bottom: none;
  }

  ul.main-menu a {
    color: #333;
    display: block;
  }

  .nav-divider {
    width: 100%;
    height: 1px;
    background-color: #ddd;
    margin: 10px 0 30px;
  }

  .sub-menu-group p {
    font-family: 'Noto Serif JP', serif;
    font-size: 13px;
    letter-spacing: 2px;
    margin-bottom: 15px;
    cursor: pointer;
  }

  .sub-menu-group.legal-links p { font-size: 11px; color: #666; }

  .hamburger.active span { background-color: #333 !important; }
  .hamburger.active span:nth-child(1) { transform: rotate(45deg); top: 9px; }
  .hamburger.active span:nth-child(2) { opacity: 0; }
  .hamburger.active span:nth-child(3) { transform: rotate(-45deg); bottom: 9px; }

  /* Footer SP */
  .site-footer { padding: 60px 20px 60px; }
  .footer-logo { font-size: 32px; margin-bottom: 30px; }
  .footer-links {
    flex-direction: row;
    max-width: 320px;
    margin: 0 auto 40px;
    gap: 15px 20px;
  }
  .footer-links li a { font-size: 12px; }
  .footer-sns { gap: 10px; }
  .sns-link img { width: 36px; height: 36px; }
}