/* === ヘッダー === */
.site-header {
  background-color: var(--anime-navi-backdefault-color);
  padding-top: var(--anime-main-padding-x5);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 3px solid transparent;
  border-image: linear-gradient(90deg, #667eea, #764ba2) 1;
}

.site-title-box {
  display: flex;
  flex-direction: column;
  padding-left: var(--anime-nav-title-space-x3);
  padding-bottom: var(--anime-main-padding-x4);
}

header.site-header h1 {
  font-family: 'M PLUS Rounded 1c', sans-serif;
  font-size: 2.5em;
  color: #ffffff;
  margin: 0;
  letter-spacing: 1px;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

header.site-header p {
  font-size: 1.1em;
  color: #e0e0e0;
  margin-top: var(--anime-margin-x2);
  font-weight: var(--anime-nav-item-font-weight);
  text-wrap-style: balance;
}

/*==================================
  検索フォーム
==================================*/

.search-form {
  display: flex;
  flex-direction: row;
  justify-content: end;
  padding: var(--anime-main-padding-x4);
}

.form-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding-right: var(--anime-main-padding-x5);
}

.form-group label {
    font-weight: 700;
    color: #555;
    white-space: nowrap;
    margin-bottom: 5px;
}

.search-input {
    flex-grow: 1;
    width: 92%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: #4a69bd;
    box-shadow: 0 0 5px rgba(74, 105, 189, 0.5);
}

.search-button {
    padding: 12px 25px;
    border-radius: 8px;
    background-color: #4a69bd;
    color: #fff;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-button:hover {
    background-color: #3b55a0;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(74, 105, 189, 0.4);
}


/* ==================================
  モバイル用検索フォーム
================================== */
.nav-search-form {
  display: flex;
  flex-direction: row;
  justify-content: center;
  padding: var(--anime-main-padding-x4);
  padding-top: 70px;
  padding-bottom: 35px;
  border-bottom: solid 3px #555;
}
.nav-form-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding-right: var(--anime-main-padding-x5);
}
.nav-search-input {
    flex-grow: 1;
    width: 92%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
    transition: all 0.3s ease;
}
.nav-search-input:focus {
    outline: none;
    border-color: #4a69bd;
    box-shadow: 0 0 5px rgba(74, 105, 189, 0.5);
}
.nav-search-button {
    padding: 12px 25px;
    border-radius: 8px;
    background-color: #4a69bd;
    color: #fff;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}
.nav-search-button:hover {
    background-color: #3b55a0;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(74, 105, 189, 0.4);
}

/* === メインナビ（PC） === */
.nav-docleft {
  min-width: var(--anime-nav-width-default-size);
  border-right: 1px solid var(--anime-theme-dark-border);
}

nav.main-nav {
  background-color: var(--anime-navi-backdefault-color);
  width: 100%;
  height: 100%;
  top: 0;
  position: relative;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

nav.main-nav ul {
  display: flex;
  justify-content: center;
  margin: 0;
  padding: 20px 0px 0px 0px;
  list-style: none;
  flex-direction: column;
}

nav.main-nav ul li {
  margin: 0 15px;
}

nav.main-nav ul li a {
  display: block;
  padding: var(--anime-main-padding-x4);
  font-size: var(--anime-nav-title-font-size-def);
  color: #ffffff;
  text-decoration: none;
  font-weight: var(--anime-nav-title-font-weight);
  transition: background 0.3s, color 0.3s;
}

nav.main-nav ul li a:hover,
nav.main-nav ul li a:focus {
  background-color: #5c6bc0;
  color: #e3f2fd;
  border-radius: 4px;
}

/* === PC表示 === */
@media screen and (min-width: 769px) {
  .mobile-nav {
    display: none;
  }

  .main-nav {
    display: block;
  }
}

/* === モバイル表示 === */
@media screen and (max-width: 768px) {
  .header.site-header {
    padding: 15px 10px 0;
  }


  .header.site-header h1 {
    font-size: 2em;
  }

  .header.site-header p {
    font-size: 1em;
  }

  .nav-docleft {
    min-width: 0;
  }
  .main-nav {
    display: none;
  }

  /* ハンバーガーボタン */
  .hamburger {
    display: block;
    cursor: pointer;
    padding: 10px 15px;
    background-color: #3949ab;
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1002;
    border-bottom-left-radius: 8px;
    box-shadow: -2px 2px 5px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
  }

  .hamburger span {
    display: block;
    width: 28px;
    height: 3px;
    margin: 6px 0;
    background: #ffffff;
    transition: all 0.3s ease-in-out;
  }

  /* ×アイコン変形 */
  .hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }

  /* === 全面展開モバイルナビ === */
  .mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 26, 26, 0.98);
    color: #fff;
    transform: translateX(100%);
    transition: transform 0.4s ease;
    z-index: 1001;
    text-align: start;
    overflow-y: auto;
  }

  .mobile-nav.show {
    transform: translateX(0);
    display: block;
  }

  .mobile-nav ul {
    list-style: none;
    padding: 10px 0 10px;
    margin: 0;
  }

  .mobile-nav ul li {
    margin: 20px 0;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeSlideIn 0.4s ease forwards;
  }

  .mobile-nav.show ul li {
    opacity: 1;
    transform: translateY(0);
  }

  .mobile-nav a {
    display: inline-block;
    color: #64b5f6;
    font-size: 1.3em;
    font-weight: 600;
    text-decoration: none;
    transition: color 0.3s;
    padding: 10px 20px;
  }

  .mobile-nav a:hover {
    color: #bbdefb;
  }

  @keyframes fadeSlideIn {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* === スマホ小画面対応 === */
@media screen and (max-width:480px) {
  .site-header {
    flex-wrap: wrap;
  }
  header.site-header h1 {
    font-size: 1.8em;
  }

  header.site-header p {
    font-size: 0.9em;
  }
}