/* common.css - サイト共通スタイル（ヘッダー・基本） */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: #141414;
    color: #f0f0f0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.7;
}

a {
    color: inherit;
}

/* ===== ヘッダー（工場背景画像） =====
   工場全体を左右見切れなしで表示 */
header {
    padding: 28px 20px 36px;
    text-align: center;
    border-bottom: 1px solid #333;
    background-color: #0a0a0a;
    background-image:
        linear-gradient(
            rgba(0, 0, 0, 0.3) 0%,
            rgba(0, 0, 0, 0.12) 50%,
            rgba(0, 0, 0, 0.05) 100%
        ),
        url('/images/factory-header.png');
    background-repeat: no-repeat;
    background-position: center center;
    /* 画像全体をヘッダー領域に収める（左右見切れ防止） */
    background-size: 100% 100%;
    min-height: 160px;
}

.logo {
    margin: 0;
    font-size: 24px;
    letter-spacing: 3px;
    color: #c8b87a;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.85);
}

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

.logo a:hover {
    color: #ffd700;
}

.header-sub {
    margin: 12px 0 0;
    font-size: 12px;
    letter-spacing: 1px;
}

.header-sub a {
    color: #888;
    text-decoration: none;
}

.header-sub a:hover {
    color: #ffd700;
}

.header-age {
    margin: 10px 0 0;
    font-size: 11px;
    color: #999;
    letter-spacing: 0.5px;
}

.header-nav {
    margin: 16px 0 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px 18px;
}

.header-nav a {
    color: #c0c0c0;
    text-decoration: none;
    font-size: 13px;
    padding: 6px 10px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.75);
}

.header-nav a:hover {
    color: #ffd700;
}

header p {
    position: relative;
    z-index: 1;
}

header p a {
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.85);
}

.header-x {
    margin: 14px 0 0;
    font-size: 12px;
    color: #999;
    line-height: 1.5;
}

.header-x a {
    color: #c8b87a;
    text-decoration: underline;
    word-break: break-all;
}

.header-x a:hover {
    color: #ffd700;
}

.footer-age {
    margin: 0 0 12px;
    font-size: 11px;
    color: #888;
}

@media (max-width: 700px) {
    header {
        background-size: 100% 100%;
        background-position: center center;
        min-height: 140px;
        padding: 22px 14px 28px;
    }

    .logo {
        font-size: 20px;
    }

    .header-nav {
        gap: 4px 8px;
    }

    .header-nav a {
        font-size: 10.5px;
        padding: 4px 5px;
    }
}

@media (max-width: 380px) {
    .header-nav {
        gap: 3px 5px;
    }

    .header-nav a {
        font-size: 10px;
        padding: 3px 4px;
    }
}