:root {
        --bg: #fafafa;
        --card: #ffffff;
        --muted: #6b6b6b;
        --accent: #111111;
        --glass: rgba(255, 255, 255, 0.85);
        --radius: 12px;
        --shadow: 0 6px 20px rgba(16, 24, 40, 0.08);
        --glass-border: rgba(0, 0, 0, 0.04);
        --primary: #000000;
        --primary-hover: #333333;
        --whatsapp: #d4af37;
        --whatsapp-hover: #d4af37d3;
        --gold: #ffd700;
        --border-light: #e0e0e0;
      }

      * {
        box-sizing: border-box;
      }
      html,
      body {
        height: 100%;
        margin: 0;
      }
      body {
        font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto,
          sans-serif;
        background: var(--bg);
        color: var(--accent);
        display: flex;
        flex-direction: column;
      }

      header {
        position: sticky;
        top: 0;
        backdrop-filter: blur(12px) saturate(180%);
        background: rgba(255, 255, 255, 0.8);
        border-bottom: 1px solid var(--glass-border);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 12px 32px;
        z-index: 1000;
        transition: all 0.3s ease;
        flex-wrap: wrap;
      }
      .brand {
        display: flex;
        gap: 14px;
        align-items: center;
        text-decoration: none;
        z-index: 1001;
      }
      .brand-text h1 {
        font-size: 20px;
        margin: 0;
        color: var(--accent);
        font-weight: 700;
      }
      .mobile-toggle {
        display: none;
        background: none;
        border: none;
        font-size: 24px;
        color: var(--accent);
        cursor: pointer;
        padding: 5px;
        z-index: 1001;
      }
      nav {
        display: flex;
        gap: 6px;
        align-items: center;
        margin: 0 24px;
      }
      nav a {
        color: var(--muted);
        text-decoration: none;
        font-weight: 600;
        font-size: 14px;
        padding: 10px 16px;
        border-radius: 10px;
        transition: all 0.2s ease;
      }
      nav a:hover,
      nav a.active {
        color: var(--primary);
        background: rgba(0, 0, 0, 0.05);
      }
      .controls {
        display: flex;
        gap: 14px;
        align-items: center;
      }
      .search {
        display: flex;
        align-items: center;
        background: var(--card);
        padding: 8px 14px;
        border-radius: 12px;
        box-shadow: var(--shadow);
        transition: all 0.3s ease;
        border: 1px solid transparent;
      }
      .search i {
        color: var(--muted);
        margin-right: 8px;
      }
      .search input {
        border: 0;
        background: transparent;
        outline: none;
        padding: 4px 0;
        width: 200px;
        color: var(--accent);
        font-weight: 500;
        font-size: 14px;
      }

      @media (max-width: 768px) {
        header {
          padding: 15px 20px;
        }
        .mobile-toggle {
          display: block;
        }
        nav,
        .controls {
          display: none;
          width: 100%;
          flex-direction: column;
          align-items: flex-start;
          padding-top: 20px;
        }
        header.menu-open {
          background: #ffffff;
          height: auto;
          padding-bottom: 20px;
        }
        header.menu-open nav,
        header.menu-open .controls {
          display: flex;
        }
        nav {
          margin: 0;
          border-top: 1px solid #eee;
          margin-top: 15px;
        }
        nav a {
          width: 100%;
          padding: 15px 0;
          font-size: 16px;
          border-bottom: 1px solid #f5f5f5;
        }
        .controls {
          margin-top: 10px;
        }
        .search,
        .search input {
          width: 100%;
        }
      }

      main {
        padding: 40px 32px 80px;
        flex: 1;
      }
      .product-detail-container {
        max-width: 1200px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: 45% 55%;
        gap: 60px;
      }

      .gallery-section {
        position: sticky;
        top: 80px; 
        height: min-content;
      }

      .main-image {
        background: var(--card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 30px;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 500px;
        margin-bottom: 20px;
      }

      .main-image img {
        max-width: 100%;
        max-height: 100%;
        object-fit: contain;
      }

      .thumbnails {
        display: flex;
        gap: 10px;
        justify-content: center;
      }

      .thumbnail {
        width: 80px;
        height: 80px;
        border-radius: 8px;
        background: var(--card);
        border: 2px solid var(--border-light);
        cursor: pointer;
        padding: 5px;
        transition: all 0.2s ease;
      }

      .thumbnail:hover,
      .thumbnail.active {
        border-color: var(--primary);
        box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
      }

      .thumbnail img {
        width: 100%;
        height: 100%;
        object-fit: contain;
      }

      .info-section {
        padding-top: 10px;
      }

      .product-brand {
        font-size: 14px;
        font-weight: 700;
        color: var(--muted);
        text-transform: uppercase;
        margin-bottom: 10px;
      }

      .product-title {
        font-size: 40px;
        font-weight: 800;
        margin: 0 0 10px 0;
        line-height: 1.1;
      }

      .product-rating {
        color: var(--gold);
        font-size: 16px;
        margin-bottom: 20px;
      }

      .product-price {
        font-size: 36px;
        font-weight: 800;
        color: var(--accent);
        margin: 0 0 30px 0;
        border-top: 1px solid var(--border-light);
        padding-top: 20px;
      }

      .size-selector {
        margin-bottom: 30px;
      }

      .size-selector h3 {
        font-size: 16px;
        font-weight: 700;
        margin: 0 0 15px 0;
      }

      .size-options {
        display: flex;
        gap: 15px;
      }

      .size-options input[type="radio"] {
        display: none;
      }

      .size-options label {
        padding: 12px 20px;
        border: 2px solid var(--border-light);
        border-radius: 8px;
        cursor: pointer;
        font-weight: 600;
        font-size: 14px;
        transition: all 0.3s ease;
        background: var(--card);
      }

      .size-options input[type="radio"]:checked + label {
        border-color: var(--primary);
        background: var(--primary);
        color: var(--card);
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
      }

      .action-buttons {
        display: flex;
        gap: 15px;
        align-items: center;
        margin-bottom: 40px;
        padding-bottom: 30px;
        border-bottom: 1px solid var(--border-light);
      }


      .btn-whatsapp {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        background: var(--whatsapp);
        color: white;
        border: none;
        padding: 15px 20px;
        border-radius: 10px;
        font-weight: 700;
        font-size: 16px;
        cursor: pointer;
        transition: all 0.3s ease;
        text-decoration: none;
        width: 100%; 
      }
      .btn-whatsapp:hover {
        background: var(--whatsapp-hover);
        transform: translateY(-2px);
        box-shadow: 0 6px 15px rgba(37, 211, 102, 0.4);
      }

      .product-tabs {
        margin-top: 30px;
      }

      .tabs-header {
        display: flex;
        border-bottom: 2px solid var(--border-light);
        margin-bottom: 20px;
      }

      .tab-button {
        background: none;
        border: none;
        padding: 15px 25px;
        font-size: 16px;
        font-weight: 600;
        color: var(--muted);
        cursor: pointer;
        transition: color 0.3s;
        border-bottom: 2px solid transparent;
        margin-bottom: -2px;
      }

      .tab-button.active {
        color: var(--primary);
        border-bottom: 2px solid var(--primary);
      }

      .tab-content {
        line-height: 1.7;
        font-size: 16px;
        color: var(--accent);
      }

      .tab-pane {
        display: none;
      }

      .tab-pane.active {
        display: block;
      }

      .tab-pane h4 {
        font-size: 18px;
        margin: 20px 0 10px 0;
        font-weight: 700;
        color: var(--primary);
      }

      .notes-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 20px;
        margin-top: 20px;
      }

      .note-category {
        background: var(--bg);
        padding: 15px;
        border-radius: 8px;
        border-left: 3px solid var(--primary);
      }

      .note-category strong {
        display: block;
        margin-bottom: 8px;
        font-size: 15px;
      }
      .note-category p {
        margin: 0;
        font-size: 14px;
        color: var(--muted);
      }

      footer {
        background: var(--card);
        padding: 60px 32px 30px;
        border-top: 1px solid var(--glass-border);
        margin-top: auto;
      }
      .footer-content {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr;
        gap: 40px;
        max-width: 1200px;
        margin: 0 auto;
      }
      .footer-brand h3 {
        font-size: 24px;
        margin: 0 0 16px 0;
        color: var(--accent);
        display: flex;
        align-items: center;
        gap: 10px;
      }
      .footer-brand p {
        color: var(--muted);
        line-height: 1.6;
        margin-bottom: 24px;
        max-width: 300px;
      }
      .footer-links h4 {
        font-size: 16px;
        margin: 0 0 20px 0;
        color: var(--accent);
        font-weight: 700;
      }
      .footer-links ul {
        list-style: none;
        padding: 0;
        margin: 0;
      }
      .footer-links li {
        margin-bottom: 12px;
      }
      .footer-links a {
        color: var(--muted);
        text-decoration: none;
        transition: color 0.2s ease;
        font-size: 14px;
      }
      .footer-links a:hover {
        color: var(--primary);
      }
      .social-links {
        display: flex;
        gap: 16px;
        margin-top: 20px;
      }
      .social-links a {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        background: var(--bg);
        border-radius: 50%;
        color: var(--muted);
        text-decoration: none;
        transition: all 0.2s ease;
      }
      .social-links a:hover {
        background: var(--primary);
        color: white;
        transform: translateY(-2px);
      }
      .footer-bottom {
        max-width: 1200px;
        margin: 50px auto 0;
        padding-top: 30px;
        border-top: 1px solid var(--glass-border);
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 20px;
      }
      .footer-bottom .legal {
        color: var(--muted);
        font-size: 14px;
      }

      @media (max-width: 992px) {
        .product-detail-container {
          grid-template-columns: 1fr;
          gap: 30px;
        }
        .gallery-section {
          position: static;
          height: auto;
        }
        .main-image {
          height: 400px;
        }
        .product-title {
          font-size: 32px;
        }
      }
      @media (max-width: 480px) {
        main {
          padding: 20px 20px 60px;
        }
        .product-title {
          font-size: 28px;
        }
        .product-price {
          font-size: 30px;
        }
        .action-buttons {
          flex-direction: column;
        }
        .btn-whatsapp {
          width: 100%;
        }
        .tabs-header {
          justify-content: space-between;
        }
        .tab-button {
          padding: 10px 15px;
          font-size: 14px;
        }
        .notes-grid {
          grid-template-columns: 1fr;
        }
        .footer-content {
          grid-template-columns: 1fr;
          gap: 30px;
        }
      }