*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
    :root { --black: #0a0a0a; --dark: #111111; --dark-gray: #1a1a1a; --medium-gray: #2a2a2a; --light-gray: #888888; --off-white: #e8e8e8; --white: #ffffff; --accent: #c8a45c; }
    body { font-family: 'Noto Sans JP', sans-serif; background: var(--black); color: var(--off-white); line-height: 1.8; }
    header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 20px 60px; display: flex; align-items: center; justify-content: space-between; background: rgba(10,10,10,0.85); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(255,255,255,0.05); }
    .logo { display: flex; align-items: center; text-decoration: none; } .logo img { height: 40px; }
    nav { display: flex; align-items: center; gap: 40px; } nav a { color: var(--light-gray); text-decoration: none; font-size: 13px; letter-spacing: 0.1em; transition: color 0.3s; } nav a:hover { color: var(--white); }
    .nav-contact { padding: 10px 28px; border: 1px solid rgba(255,255,255,0.2); font-size: 12px; letter-spacing: 0.15em; transition: all 0.3s; } .nav-contact:hover { background: var(--white); color: var(--black) !important; }
    .hamburger { display: none; flex-direction: column; gap: 5px; width: 28px; height: 28px; cursor: pointer; z-index: 200; } .hamburger span { display: block; width: 100%; height: 2px; background: var(--white); transition: all 0.3s; }
    .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); } .hamburger.active span:nth-child(2) { opacity: 0; } .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }
    .mobile-nav { position: fixed; inset: 0; background: rgba(10,10,10,0.95); backdrop-filter: blur(20px); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 32px; z-index: 150; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
    .mobile-nav.open { opacity: 1; pointer-events: auto; } .mobile-nav a { color: var(--off-white); text-decoration: none; font-size: 18px; letter-spacing: 0.15em; }
    .article { max-width: 760px; margin: 0 auto; padding: 140px 40px 120px; }
    .article-meta { margin-bottom: 32px; } .article-date { font-size: 13px; color: var(--light-gray); }
    .article-category { font-size: 10px; letter-spacing: 0.1em; padding: 4px 12px; border: 1px solid var(--medium-gray); color: var(--light-gray); margin-left: 12px; }
    .article h1 { font-size: clamp(22px, 3vw, 32px); font-weight: 500; color: var(--white); line-height: 1.6; margin-bottom: 40px; }
    .article-body h2 { font-size: 18px; color: var(--white); margin: 40px 0 16px; padding-bottom: 8px; border-bottom: 1px solid var(--medium-gray); }
    .article-body h3 { font-size: 16px; color: var(--accent); margin: 28px 0 12px; }
    .article-body p { font-size: 15px; color: var(--light-gray); line-height: 2.2; font-weight: 300; margin-bottom: 20px; }
    .article-body ul { padding-left: 20px; margin-bottom: 20px; } .article-body li { font-size: 14px; color: var(--light-gray); line-height: 2; }
    .article-back { display: inline-block; margin-top: 48px; padding: 12px 32px; border: 1px solid var(--accent); color: var(--accent); text-decoration: none; font-size: 13px; letter-spacing: 0.1em; transition: all 0.3s; } .article-back:hover { background: var(--accent); color: var(--black); }
    footer { background: var(--black); border-top: 1px solid var(--medium-gray); padding: 60px; display: flex; justify-content: space-between; align-items: center; }
    .footer-logo img { height: 30px; opacity: 0.6; } .footer-copy { font-size: 11px; color: var(--light-gray); letter-spacing: 0.1em; }
    @media (max-width: 768px) { header { padding: 14px 20px; } nav { display: none; } .hamburger { display: flex; } .article { padding: 120px 24px 80px; } footer { flex-direction: column; gap: 20px; padding: 40px 24px; } }