/* ============================================================
   seiheki.com 共通ナビゲーション & フッター
   nav_common.css
   ============================================================ */

/* ナビバー */
.sk-nav {
    background: #1a1a1a;
    border-bottom: 1px solid #333;
    padding: 0 16px;
    position: sticky;
    top: 0;
    z-index: 9000;
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif;
}
.sk-nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 44px;
    gap: 4px;
}
.sk-nav-brand {
    display: flex;
    align-items: center;
    gap: 7px;
    text-decoration: none;
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    margin-right: 16px;
    white-space: nowrap;
    flex-shrink: 0;
}
.sk-nav-brand svg { fill: #fff; }
.sk-nav-links {
    list-style: none;
    display: flex;
    gap: 2px;
    margin: 0;
    padding: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.sk-nav-links li { flex-shrink: 0; }
.sk-nav-links a {
    display: block;
    padding: 10px 12px;
    font-size: 12px;
    color: #999;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    transition: color 0.15s;
}
.sk-nav-links a:hover {
    color: #fff;
}
.sk-nav-links a.active {
    color: #fff;
    border-bottom-color: #fff;
    font-weight: 600;
}
/* 構想中リンクはグレーアウト */
.sk-nav-links a.planned {
    color: #555;
    cursor: default;
    pointer-events: none;
    font-style: italic;
}
.sk-nav-links a.planned::after {
    content: '(準備中)';
    font-size: 9px;
    margin-left: 3px;
    color: #444;
}
.sk-nav-admin {
    margin-left: auto;
    display: flex;
    align-items: center;
    padding: 5px 10px;
    font-size: 12px;
    color: #888;
    text-decoration: none;
    border: 1px solid #444;
    border-radius: 6px;
    white-space: nowrap;
    flex-shrink: 0;
    transition: color 0.15s, border-color 0.15s;
}
.sk-nav-admin:hover {
    color: #fff;
    border-color: #888;
}

/* ハンバーガー（SPのみ） */
.sk-nav-toggle {
    display: none;
    background: none;
    border: 1px solid #444;
    border-radius: 5px;
    padding: 6px 7px;
    cursor: pointer;
    margin-left: auto;
    flex-direction: column;
    gap: 3px;
    flex-shrink: 0;
}
.sk-nav-toggle span {
    display: block;
    width: 16px;
    height: 1.5px;
    background: #ccc;
    border-radius: 1px;
    transition: transform 0.2s, opacity 0.2s;
}

@media (max-width: 640px) {
    .sk-nav-inner { flex-wrap: wrap; height: auto; padding: 8px 0; }
    .sk-nav-toggle { display: flex; }
    .sk-nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: 0;
        padding: 4px 0 0;
    }
    .sk-nav.open .sk-nav-links { display: flex; }
    .sk-nav-links a {
        padding: 10px 8px;
        border-bottom: none;
        border-left: 2px solid transparent;
    }
    .sk-nav-links a.active {
        border-bottom: none;
        border-left-color: #fff;
        background: rgba(255,255,255,0.05);
    }
    .sk-nav-admin {
        margin-left: 0;
        margin-top: 4px;
        width: 100%;
        justify-content: center;
        display: none;
    }
    .sk-nav.open .sk-nav-admin { display: flex; }
}

/* フッター */
.sk-footer {
    border-top: 1px solid #e8e6e0;
    padding: 14px 20px;
    background: #fff;
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif;
}
.sk-footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}
.sk-footer-update {
    font-size: 11px;
    color: #aaa;
}
.sk-footer-powered {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: #888;
}
.sk-footer-powered a {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #888;
    text-decoration: none;
}
.sk-footer-powered svg { fill: #888; }