/* ==========================================================================
   ヘッダー専用スタイル
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

/* ロゴ */
.header-logo__link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.header-logo__img,
.header-logo__link .custom-logo {
    max-height: 2.5rem;
    max-width: 8rem;
    width: auto;
    object-fit: contain;
}

.header-logo__title {
    font-size: 1.125rem;
    font-weight: 800;
    color: var(--shingaku-title-color, #4f46e5);
}

/* ナビゲーション */
.header-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.header-nav__link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: #334155;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.2s ease;
}

.header-nav__link:hover {
    color: #0f172a;
    background: #f1f5f9;
}

.header-nav__link.active {
    color: #4f46e5;
    background: #eef2ff;
}

.header-nav__link i {
    width: 1.125rem;
    height: 1.125rem;
}

/* カテゴリードロップダウン */
.header-dropdown {
    position: relative;
}

.header-dropdown__trigger {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: #334155;
    font-size: 0.875rem;
    font-weight: 500;
    background: transparent;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.header-dropdown__trigger:hover {
    color: #0f172a;
    background: #f1f5f9;
}

.header-dropdown__trigger i {
    width: 1.125rem;
    height: 1.125rem;
}

.header-dropdown__trigger .chevron {
    width: 0.875rem;
    height: 0.875rem;
    transition: transform 0.2s ease;
}

.header-dropdown:hover .header-dropdown__trigger .chevron {
    transform: rotate(180deg);
}

.header-dropdown__menu {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 0.5rem;
    min-width: 220px;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 1rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
}

.header-dropdown:hover .header-dropdown__menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.header-dropdown__item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: #334155;
    font-size: 0.875rem;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.2s ease;
}

.header-dropdown__item:hover {
    background: #f1f5f9;
    color: #0f172a;
}

.header-dropdown__item-indicator {
    width: 0.625rem;
    height: 0.625rem;
    border-radius: 50%;
    flex-shrink: 0;
}

.header-dropdown__item-icon {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
}

/* 右側アクション */
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* 検索フォーム */
.header-search {
    position: relative;
}

.header-search__input {
    width: 200px;
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    border-radius: 9999px;
    color: #0f172a;
    font-size: 0.875rem;
    outline: none;
    transition: all 0.2s ease;
}

.header-search__input::placeholder {
    color: #94a3b8;
}

.header-search__input:focus {
    background: #fff;
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.header-search__icon {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1rem;
    height: 1rem;
    color: #94a3b8;
    pointer-events: none;
}

/* マイページボタン */
.header-user-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.2s ease;
}

.header-user-btn--guest {
    color: #334155;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
}

.header-user-btn--guest:hover {
    color: #0f172a;
    background: #e2e8f0;
    border-color: #cbd5e1;
}

.header-user-btn--logged-in {
    color: white;
    background: linear-gradient(135deg, #4f46e5, #8b5cf6);
    border: none;
}

.header-user-btn--logged-in:hover {
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
    transform: translateY(-1px);
}

.header-user-btn i {
    width: 1.125rem;
    height: 1.125rem;
}

/* モバイルメニューボタン */
.header-mobile-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    color: #334155;
    background: transparent;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.header-mobile-toggle:hover {
    color: #0f172a;
    background: #f1f5f9;
}

.header-mobile-toggle i {
    width: 1.5rem;
    height: 1.5rem;
}

/* モバイルメニュー */
.mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.5rem;
    overflow-y: auto;
}

.mobile-menu.is-open {
    display: block;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.mobile-menu__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.mobile-menu__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    color: #334155;
    background: #f1f5f9;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
}

.mobile-menu__close i {
    width: 1.5rem;
    height: 1.5rem;
}

.mobile-menu__search {
    margin-bottom: 2rem;
}

.mobile-menu__search input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    border-radius: 0.75rem;
    color: #0f172a;
    font-size: 1rem;
}

.mobile-menu__search input::placeholder {
    color: #94a3b8;
}

.mobile-menu__nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mobile-menu__link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    color: #334155;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 0.75rem;
    transition: all 0.2s ease;
}

.mobile-menu__link:hover {
    background: #f1f5f9;
    color: #0f172a;
}

.mobile-menu__link i {
    width: 1.25rem;
    height: 1.25rem;
}

.mobile-menu__divider {
    height: 1px;
    background: #e2e8f0;
    margin: 1rem 0;
}

.mobile-menu__section-title {
    padding: 0.5rem 1rem;
    color: #94a3b8;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* レスポンシブ */
@media (max-width: 1023px) {
    .header-nav,
    .header-search {
        display: none;
    }

    .header-mobile-toggle {
        display: flex;
    }
}

@media (max-width: 640px) {
    .header-logo__title {
        font-size: 0.875rem;
    }

    .header-user-btn span {
        display: none;
    }

    .header-user-btn {
        padding: 0.5rem;
    }
}