*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --black: #0a0a0a; --white: #ffffff; --off-white: #f8f8f6;
      --light-grey: #e8e8e6; --mid-grey: #999; --dark-grey: #444;
      --font: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    }
    html { font-size: 16px; }
    body { font-family: var(--font); background: var(--white); color: var(--black); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
    .page { display: none; }
    .page.active { display: block; animation: fadeIn 0.3s ease; }
    @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

    header {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      background: var(--white); height: 60px;
      display: flex; align-items: center; justify-content: space-between; padding: 0 24px;
    }
    @media (max-width: 768px) {
      header { height: auto; flex-wrap: wrap; padding: 10px 16px 8px; align-content: flex-start; gap: 6px; }
      .header-logo { width: 100%; display: flex; align-items: center; }
      .header-logo img { height: 28px; }
      .header-tagline { display: none; }
      nav { width: 100%; display: flex; gap: 24px; padding-bottom: 4px; }
      nav a { font-size: 9px; letter-spacing: 0.15em; line-height: 1; padding: 6px 0; }
      .content { padding-top: 110px; } /* overridden by JS */
    }
    .header-logo { cursor: pointer; height: 22px; display: block; }
    .header-logo img { height: 100%; width: auto; display: block; }
    .header-tagline {
      font-size: 13px; letter-spacing: 0.08em; color: var(--dark-grey); font-style: italic;
      position: absolute; left: 50%; transform: translateX(-50%); white-space: nowrap; pointer-events: none;
    }

    nav { display: flex; gap: 32px; align-items: center; }
    nav a { font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--dark-grey); text-decoration: none; cursor: pointer; transition: color 0.2s; }
    nav a:hover { color: var(--black); }

    .content { padding-top: 60px; min-height: 100vh; }

    .product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--white); }
    @media (max-width: 768px) { .product-grid { grid-template-columns: 1fr; } }
    @media (min-width: 769px) and (max-width: 1100px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }

    .product-card { background: var(--white); cursor: pointer; position: relative; }
    .img-container { aspect-ratio: 1 / 1; position: relative; overflow: hidden; background: var(--white); }
    .img-front, .img-back { position: absolute; inset: 0; background: var(--white); }
    .img-back { opacity: 0; }
    .product-card.has-back:hover .img-back, .product-card.flipped .img-back { opacity: 1; }
    .product-card.has-back:hover .img-front, .product-card.flipped .img-front { opacity: 0; }
    .img-front img, .img-back img { width: 100%; height: 100%; object-fit: contain; object-position: center; display: block; }
    .product-info { padding: 14px 16px 20px; background: var(--white); }
    .product-name { font-size: 11px; letter-spacing: 0.05em; color: var(--black); margin-bottom: 4px; line-height: 1.4; }
    .product-price { font-size: 11px; letter-spacing: 0.08em; color: var(--mid-grey); }

    .detail-layout { display: grid; grid-template-columns: 1fr 1fr; min-height: calc(100vh - 60px); }
    @media (max-width: 768px) { .detail-layout { grid-template-columns: 1fr; } }
    .detail-images { background: var(--white); }
    .detail-main-img { width: 100%; aspect-ratio: 1 / 1; overflow: hidden; background: var(--white); cursor: zoom-in; }
    .detail-main-img img { width: 100%; height: 100%; object-fit: contain; display: block; }
    .detail-thumbs { display: flex; gap: 1px; background: var(--light-grey); }
    .detail-thumb { flex: 1; aspect-ratio: 1; overflow: hidden; cursor: pointer; background: var(--white); opacity: 0.5; transition: opacity 0.2s; }
    .detail-thumb.active, .detail-thumb:hover { opacity: 1; }
    .detail-thumb img { width: 100%; height: 100%; object-fit: contain; display: block; }
    .detail-info { padding: clamp(32px, 5vw, 64px); display: flex; flex-direction: column; justify-content: center; }
    .detail-name { font-size: clamp(18px, 2.5vw, 26px); font-weight: 300; letter-spacing: 0.04em; line-height: 1.2; color: var(--black); margin-bottom: 6px; }
    .detail-tagline { font-size: 13px; color: var(--mid-grey); letter-spacing: 0.02em; font-style: italic; margin-bottom: 12px; line-height: 1.6; }
    .size-row { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 12px; }
    .color-label { font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--mid-grey); }
    .more-details-toggle { font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--mid-grey); cursor: pointer; padding: 4px 0 0; display: flex; justify-content: space-between; align-items: center; }
    .more-details-toggle:hover { color: var(--black); }
    .more-details-content { display: none; font-size: 9px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--mid-grey); line-height: 2.2; padding-top: 16px; }
    .detail-product-details { font-size: 10px; letter-spacing: 0.08em; color: var(--mid-grey); line-height: 1.8; margin-bottom: 24px; }
    .size-guide-link { font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--mid-grey); text-decoration: underline; cursor: pointer; margin-left: 12px; }
    .size-guide-link:hover { color: var(--black); }
    .detail-price { font-size: 16px; letter-spacing: 0.08em; color: var(--black); margin-bottom: 32px; }
    .size-label { font-size: 9px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--mid-grey); margin-bottom: 12px; }
    .size-options { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
    .size-btn { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; border: 1px solid var(--light-grey); background: transparent; font-family: var(--font); font-size: 10px; letter-spacing: 0.1em; color: var(--dark-grey); cursor: pointer; transition: all 0.2s; }
    .size-btn:hover { border-color: var(--black); color: var(--black); }
    .size-btn.active { background: var(--black); border-color: var(--black); color: var(--white); }
    .size-btn.out-of-stock { opacity: 0.3; cursor: not-allowed; text-decoration: line-through; }
    .buy-btn { display: block; width: 100%; padding: 16px; background: var(--black); color: var(--white); font-family: var(--font); font-size: 10px; letter-spacing: 0.35em; text-transform: uppercase; text-align: center; border: none; cursor: pointer; transition: background 0.2s; }
    .buy-btn:hover { background: #333; }
    .size-note { font-size: 10px; letter-spacing: 0.05em; color: var(--mid-grey); margin-top: 8px; min-height: 16px; }
    .detail-divider { display: none; }
    .detail-features { font-size: 10px; letter-spacing: 0.08em; line-height: 2.5; color: var(--mid-grey); text-transform: uppercase; }

    #about-page .content { padding-top: 60px; padding-bottom: 0; }
    .about-inner { max-width: 900px; margin: 0 auto; padding: 0 24px 80px; }
    .about-header { padding: 60px 0 40px; border-bottom: 1px solid var(--light-grey); margin-bottom: 60px; }
    .about-title { font-size: 10px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--mid-grey); margin-bottom: 20px; }
    .about-tagline { font-size: clamp(24px, 4vw, 42px); font-weight: 300; letter-spacing: 0.02em; line-height: 1.2; color: var(--black); font-style: italic; }
    .about-body { font-size: 13px; line-height: 2; color: var(--dark-grey); letter-spacing: 0.02em; margin-bottom: 48px; max-width: 600px; }
    .about-body p + p { margin-top: 24px; }
    .about-intro { font-size: 15px; line-height: 2; color: var(--dark-grey); letter-spacing: 0.02em; text-align: center; max-width: 860px; margin: 0 auto 60px; padding-top: 48px; padding-left: 24px; padding-right: 24px; }
    .about-intro p + p { margin-top: 28px; }
    .about-statement { font-size: 14px; line-height: 2; color: var(--dark-grey); letter-spacing: 0.02em; text-align: left; margin-bottom: 60px; padding-top: 48px; max-width: 820px; }
    .about-statement p + p { margin-top: 24px; }
    .about-closing { margin-top: 24px; margin-bottom: 48px; font-style: italic; text-align: center; color: var(--dark-grey); font-size: 14px; line-height: 2; letter-spacing: 0.08em; }
    .about-section-title { font-size: 9px; letter-spacing: 0.35em; text-transform: uppercase; color: var(--mid-grey); margin-bottom: 16px; margin-top: 40px; padding-top: 0; }
    .detail-shots-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; margin-bottom: 16px; margin-top: 0; padding-top: 10px; }
    @media (max-width: 600px) { .detail-shots-grid { grid-template-columns: repeat(2, 1fr); } }
    .detail-shot { aspect-ratio: 1; overflow: hidden; background: var(--off-white); cursor: zoom-in; }
    .detail-shot img { width: 100%; height: 100%; object-fit: cover; display: block; }
    .about-features { font-size: 14px; letter-spacing: 0.02em; line-height: 2; color: var(--dark-grey); padding-top: 0; margin-top: 0; } .about-features p + p { margin-top: 20px; }
    .construction-list { list-style: none; margin-top: 16px; margin-bottom: 0; padding-left: 0; }
    .construction-list li { padding-left: 20px; position: relative; margin-bottom: 16px; line-height: 1.8; }
    .construction-list li::before { content: "-"; position: absolute; left: 0; color: var(--dark-grey); }

    footer { padding: 32px 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; width: 100%; box-sizing: border-box; }
    .footer-left { font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--mid-grey); }
    .footer-right { display: flex; gap: 24px; }
    .footer-right a { font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--mid-grey); text-decoration: none; transition: color 0.2s; }
    .footer-right a:hover { color: var(--black); }
    .back-btn { display: inline-flex; align-items: center; gap: 8px; font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--mid-grey); cursor: pointer; padding: 20px 24px; transition: color 0.2s; background: none; border: none; font-family: var(--font); }
    .back-btn:hover { color: var(--black); }
    @media (max-width: 768px) { .detail-info { padding: 24px 16px 40px; } }