/* ============================================
   医療AIナビ - 共通ヘッダー/フッター（site chrome）
   top.css のヘッダー・フッター定義を全セクションで共有するための抜粋。
   E資格/G検定ページ等、top.css を読まないページで各自のCSSの後に読み込む。
   変数依存を避けるため色は直値で記述。
   ============================================ */

/* ===== HEADER ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: auto;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}
.site-header.scrolled {
    background: rgba(255,255,255,0.95);
    border-bottom-color: #e5e7eb;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.15rem;
    color: #14408a;
    flex-shrink: 0;
    text-decoration: none;
}
.logo-img {
    width: 38px;
    height: 38px;
    object-fit: contain;
    border-radius: 6px;
}
.logo-text { letter-spacing: 0.02em; }

/* Nav */
.main-nav { text-align: left; }
.main-nav ul {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}
.main-nav > ul > li > a {
    display: block;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 500;
    color: #4b5563;
    border-radius: 6px;
    transition: all 0.2s;
    text-decoration: none;
}
.main-nav > ul > li > a:hover,
.main-nav > ul > li > a.active {
    color: #1a56b8;
    background: #eef4fe;
}

/* Dropdown */
.has-dropdown { position: relative; }
.chevron { font-size: 0.7em; margin-left: 2px; transition: transform 0.2s; }
.dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 280px;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    box-shadow: 0 12px 32px rgba(0,0,0,0.10);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
}
.has-dropdown:hover .dropdown,
.has-dropdown.show-dropdown .dropdown {
    opacity: 1;
    visibility: visible;
}
.has-dropdown:hover .chevron { transform: rotate(180deg); }
.dropdown li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: #374151;
    transition: background 0.15s;
    text-decoration: none;
}
.dropdown li a:hover { background: #f3f4f6; }
.dropdown-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
}
.e-badge { background: #dce8fd; color: #14408a; }
.g-badge { background: #dcfce7; color: #15803d; }

/* Mobile toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: #374151;
    border-radius: 2px;
    transition: all 0.3s;
}
.mobile-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ===== SECTION NAV（セクション内タブ：E資格 / G検定）===== */
/* グローバルヘッダー(fixed,64px)の直下に配置し、スクロール時は貼り付く */
.section-nav {
    margin-top: 64px;
    position: sticky;
    top: 64px;
    z-index: 900;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
}
/* ヒーローが持つ固定ヘッダー回避用マージンを打ち消す
   （section-nav 側で余白を確保するため。このCSSはE/G資格ページのみ読み込む） */
.hero { margin-top: 0; }

.section-nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    height: 48px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.section-nav-inner::-webkit-scrollbar { display: none; }

.section-nav-title {
    flex-shrink: 0;
    font-size: 0.85rem;
    font-weight: 700;
    color: #14408a;
    letter-spacing: 0.02em;
    padding-right: 20px;
    border-right: 1px solid #e5e7eb;
}
.section-nav ul {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}
.section-nav li { margin: 0; }
.section-nav li a {
    display: block;
    white-space: nowrap;
    padding: 7px 14px;
    font-size: 0.86rem;
    font-weight: 500;
    color: #4b5563;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s;
}
.section-nav li a:hover { color: #1a56b8; background: #eef4fe; }
.section-nav li a.active {
    color: #1a56b8;
    background: #eef4fe;
    font-weight: 700;
}

/* ===== FOOTER ===== */
.site-footer {
    background: #111827;
    color: #9ca3af;
    padding: 48px 0 0;
    text-align: left;
    font-size: 1rem;
}
.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px 40px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    background: transparent;
}
.footer-logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
}
.footer-tagline {
    font-size: 0.8rem;
    color: #6b7280;
    margin-top: 4px;
}
.footer-links { display: flex; gap: 64px; }
.footer-col h4 {
    font-size: 0.8rem;
    font-weight: 600;
    color: #d1d5db;
    margin-bottom: 14px;
    letter-spacing: 0.05em;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
    font-size: 0.85rem;
    color: #9ca3af;
    transition: color 0.2s;
    text-decoration: none;
}
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 24px;
    background: transparent;
}
.footer-bottom p {
    font-size: 0.75rem;
    color: #4b5563;
    margin: 0;
}

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
    .mobile-toggle { display: flex; }

    .main-nav {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        height: calc(100vh - 64px);
        background: #fff;
        border-top: 1px solid #e5e7eb;
        box-shadow: 0 12px 32px rgba(0,0,0,0.10);
        transform: translateY(-20px);
        opacity: 0;
        pointer-events: none;
        visibility: hidden;
        transition: transform 0.3s, opacity 0.3s, visibility 0.3s;
        padding: 0;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        z-index: 999;
    }
    .main-nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
        visibility: visible;
    }
    .main-nav ul,
    .main-nav > ul {
        display: flex;
        flex-direction: column;
        gap: 0;
        padding: 12px 24px 80px;
    }
    .main-nav > ul > li > a {
        padding: 16px 8px;
        font-size: 1rem;
        border-bottom: 1px solid #f3f4f6;
        display: block;
        width: 100%;
        text-align: left;
    }

    .has-dropdown .dropdown {
        position: static;
        transform: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        min-width: 0;
        width: 100%;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, opacity 0.3s;
        opacity: 0;
        visibility: visible;
    }
    .has-dropdown.show-dropdown .dropdown {
        max-height: 300px;
        opacity: 1;
        padding: 4px 0 8px 0;
    }
    .has-dropdown:hover .dropdown {
        opacity: 0;
        visibility: hidden;
        max-height: 0;
    }
    .has-dropdown.show-dropdown:hover .dropdown {
        opacity: 1;
        visibility: visible;
        max-height: 300px;
    }
    .dropdown li a {
        padding: 12px 16px;
        font-size: 0.9rem;
        display: flex;
        align-items: center;
        gap: 12px;
        white-space: nowrap;
    }

    .footer-inner {
        flex-direction: column;
        gap: 32px;
    }
    .footer-links { gap: 40px; }
}

@media (max-width: 480px) {
    .header-inner { height: 56px; padding: 0 16px; }
    .main-nav { top: 56px; height: calc(100vh - 56px); }
    .main-nav ul,
    .main-nav > ul { padding: 12px 16px 80px; }
    .logo-img { width: 32px; height: 32px; }
    .logo-text { font-size: 1.05rem; }

    .section-nav { margin-top: 56px; top: 56px; }
    .section-nav-inner { padding: 0 16px; gap: 12px; height: 44px; }
    .section-nav-title { padding-right: 12px; font-size: 0.8rem; }
    .section-nav li a { padding: 6px 10px; font-size: 0.82rem; }

    .footer-inner { padding: 0 16px 32px; gap: 28px; }
    .footer-links { flex-direction: column; gap: 24px; }
    .footer-bottom { padding: 16px; }
    .footer-bottom p { font-size: 0.7rem; }
}