:root {
      --bg: #f5f7fb;
      --text: #101114;
      --muted: #60646c;
      --card: #ffffff;
      --border: #e5e7eb;
      --black: #111111;
      --accent: #111111;
      --soft: #eef1f6;
      --green: #00ae42;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: Arial, Helvetica, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.45;
      overflow-x: hidden;
    }

    /* FULLSCREEN LOADING OVERLAY */
    #loading-screen {
      position: fixed;
      inset: 0;
      z-index: 9999;
      background: #f5f7fb;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 1;
      visibility: visible;
      transition: opacity 0.6s ease, visibility 0.6s ease;
    }

    #loading-screen.fade-out {
      opacity: 0;
      visibility: hidden;
      pointer-events: none;
    }

    #loading-animation {
      width: 50vw;
      max-width: 520px;
      height: auto;
      display: block;
    }

    @media (max-width: 600px) {
      #loading-animation {
        width: 62vw;
        max-width: 300px;
        min-width: 220px;
        height: auto;
      }
    }

    /* PAGE */
    .page {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    header {
      width: 100%;
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(245, 247, 251, 0.88);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(229, 231, 235, 0.75);
    }

    .nav {
      max-width: 1180px;
      margin: 0 auto;
      padding: 14px 18px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--text);
      font-weight: 800;
      letter-spacing: -0.04em;
      font-size: 1.15rem;
    }

    .brand-mark {
      width: 28px;
      height: 28px;
      border-radius: 8px;
      background: #111;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      align-items: end;
      gap: 2px;
      padding: 5px;
    }

    .brand-mark span {
      background: white;
      border-radius: 2px;
      display: block;
    }

    .brand-mark span:nth-child(1) { height: 45%; }
    .brand-mark span:nth-child(2) { height: 75%; }
    .brand-mark span:nth-child(3) { height: 58%; }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 16px;
      font-size: 0.9rem;
    }

    .nav-links a {
      color: var(--muted);
      text-decoration: none;
      font-weight: 700;
    }

    .nav-links a:hover {
      color: var(--text);
    }

    .nav-buy {
      color: white !important;
      background: #111;
      padding: 9px 14px;
      border-radius: 999px;
    }

    main {
      flex: 1;
    }

    .hero {
      max-width: 1180px;
      margin: 0 auto;
      padding: 34px 18px 54px;
      display: grid;
      grid-template-columns: 1fr;
      gap: 28px;
    }

    .hero-copy {
      text-align: center;
      max-width: 760px;
      margin: 0 auto;
      padding-top: 10px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 12px;
      border: 1px solid var(--border);
      background: rgba(255,255,255,0.7);
      border-radius: 999px;
      color: #30343a;
      font-size: 0.82rem;
      font-weight: 800;
      margin-bottom: 18px;
    }

    .eyebrow-dot {
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: #111;
    }

    h1 {
      font-size: clamp(2.45rem, 10vw, 5.7rem);
      line-height: 0.9;
      letter-spacing: -0.075em;
      margin-bottom: 18px;
    }

    .tagline {
      font-size: clamp(1.05rem, 3.7vw, 1.55rem);
      color: #2d3035;
      font-weight: 700;
      letter-spacing: -0.03em;
      max-width: 680px;
      margin: 0 auto;
    }

    .subtagline {
      color: var(--muted);
      font-size: 1rem;
      max-width: 620px;
      margin: 12px auto 0;
    }

    .shop-shell {
      max-width: 1040px;
      margin: 0 auto;
      background: rgba(255,255,255,0.74);
      border: 1px solid rgba(229,231,235,0.95);
      box-shadow: 0 22px 80px rgba(16,17,20,0.08);
      border-radius: 30px;
      overflow: hidden;
    }

    .product-layout {
      display: grid;
      grid-template-columns: 1fr;
      min-height: 590px;
    }

    .preview-panel {
      background:
        radial-gradient(circle at top left, rgba(0,0,0,0.08), transparent 34%),
        linear-gradient(145deg, #eef1f6, #ffffff);
      padding: 28px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 14px;
      position: relative;
      overflow: hidden;
      touch-action: pan-y;
      cursor: grab;
      margin: 0 -28px 24px;
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      min-height: 430px;
    }
    
    .preview-panel:active {
      cursor: grabbing;
    }
    
    .preview-panel::before {
      content: "";
      position: absolute;
      width: 340px;
      height: 340px;
      border-radius: 999px;
      background: rgba(17,17,17,0.045);
      top: 45%;
      left: 50%;
      transform: translate(-50%, -50%);
    }
    
    .product-image-wrap {
      width: 100%;
      max-width: 530px;
      aspect-ratio: 1 / 1;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      z-index: 2;
    }
    
    #product-image {
      width: 100%;
      max-width: 470px;
      height: auto;
      object-fit: contain;
      display: block;
      filter: drop-shadow(0 34px 45px rgba(0,0,0,0.16));
      transition: opacity 0.18s ease, transform 0.18s ease;
      user-select: none;
      -webkit-user-drag: none;
    }
    
    #product-image.changing {
      opacity: 0;
      transform: scale(0.985);
    }
    
    .preview-badge {
      position: relative;
      z-index: 4;
      width: 100%;
      max-width: 530px;
      background: rgba(255,255,255,0.82);
      border: 1px solid rgba(229,231,235,0.95);
      backdrop-filter: blur(10px);
      padding: 11px 14px;
      border-radius: 16px;
      font-size: 0.86rem;
      color: var(--muted);
      font-weight: 700;
      text-align: center;
    }
    
    .preview-badge strong {
      display: block;
      color: var(--text);
      font-size: 0.98rem;
      margin-bottom: 2px;
    }
    
    .preview-badge span {
      display: block;
    }

    .selector-panel {
      background: #fff;
      padding: 28px;
      display: flex;
      flex-direction: column;
    }

    .selector-title {
      margin-bottom: 22px;
    }

    .selector-title h2 {
      font-size: 1.8rem;
      letter-spacing: -0.055em;
      line-height: 1;
      margin-bottom: 8px;
    }

    .selector-title p {
      color: var(--muted);
      font-size: 0.96rem;
    }

    .section-label {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 10px;
      margin-bottom: 10px;
      font-weight: 800;
      color: var(--text);
    }

    .section-label span {
      color: var(--muted);
      font-weight: 700;
      font-size: 0.88rem;
    }

    .model-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 10px;
      margin-bottom: 24px;
    }

    .model-option {
      border: 1px solid var(--border);
      background: #fff;
      border-radius: 18px;
      padding: 15px;
      cursor: pointer;
      text-align: left;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      transition: border-color 0.16s ease, background 0.16s ease, transform 0.16s ease;
    }

    .model-option:hover {
      border-color: #111;
      transform: translateY(-1px);
    }

    .model-option.active {
      border-color: #111;
      background: #f5f7fb;
      box-shadow: inset 0 0 0 1px #111;
    }

    .model-name {
      font-weight: 900;
      font-size: 1rem;
      letter-spacing: -0.03em;
      margin-bottom: 3px;
    }

    .model-desc {
      color: var(--muted);
      font-size: 0.86rem;
    }

    .model-price {
      font-weight: 900;
      font-size: 1rem;
      white-space: nowrap;
    }

    .color-list {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
      margin-bottom: 10px;
    }

    .color-option {
      width: 48px;
      height: 48px;
      border-radius: 999px;
      border: 1px solid transparent;
      background: transparent;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: border-color 0.16s ease, transform 0.16s ease;
      position: relative;
    }

    .color-option:hover {
      border-color: var(--green);
      transform: translateY(-1px);
    }

    .color-option.active {
      border-color: #111;
    }

    .color-swatch {
      width: 38px;
      height: 38px;
      border-radius: 999px;
      border: 1px solid rgba(0,0,0,0.14);
      box-shadow: inset 0 2px 5px rgba(255,255,255,0.25);
      display: block;
    }

    .color-option.active::after {
      content: "";
      position: absolute;
      width: 13px;
      height: 13px;
      border-radius: 999px;
      background: #111;
      right: 1px;
      bottom: 1px;
      border: 2px solid white;
    }

    .selected-color-name {
      font-size: 0.9rem;
      color: var(--muted);
      margin-bottom: 24px;
    }

    .selected-color-name strong {
      color: var(--text);
    }

    .buy-panel {
      margin-top: auto;
      border-top: 1px solid var(--border);
      padding-top: 20px;
    }

    .selection-summary {
      background: #f5f7fb;
      border: 1px solid var(--border);
      border-radius: 18px;
      padding: 13px 14px;
      margin-bottom: 14px;
      display: flex;
      justify-content: space-between;
      gap: 14px;
      align-items: center;
    }

    .summary-label {
      color: var(--muted);
      font-size: 0.82rem;
      font-weight: 800;
      margin-bottom: 2px;
    }

    .summary-value {
      color: var(--text);
      font-size: 0.98rem;
      font-weight: 900;
    }

    .summary-price {
      font-size: 1.35rem;
      font-weight: 950;
      letter-spacing: -0.04em;
      white-space: nowrap;
    }

    .buy-button {
      width: 100%;
      border: none;
      background: #111;
      color: white;
      border-radius: 18px;
      padding: 17px 18px;
      font-weight: 950;
      font-size: 1.04rem;
      cursor: pointer;
      transition: transform 0.16s ease, background 0.16s ease;
    }

    .buy-button:hover {
      background: #000;
      transform: translateY(-1px);
    }

    .buy-button:active {
      transform: translateY(0);
    }

    .microcopy {
      text-align: center;
      color: var(--muted);
      font-size: 0.82rem;
      margin-top: 10px;
    }

    .info-strip {
      max-width: 1040px;
      margin: 20px auto 0;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
    }
    
    .info-card {
      background: rgba(255,255,255,0.78);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 17px;
      box-shadow: 0 16px 35px rgba(0,0,0,0.045);
    }
    
    .info-pill {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 38px;
      height: 30px;
      padding: 0 10px;
      margin-bottom: 12px;
      border-radius: 999px;
      background: #111111;
      color: #ffffff;
      font-size: 0.75rem;
      font-weight: 900;
      letter-spacing: -0.02em;
    }
    
    .info-card p {
      color: var(--muted);
      font-size: 0.88rem;
      line-height: 1.45;
    }

    .about-section {
      max-width: 820px;
      margin: 72px auto 54px;
      padding: 0 18px;
      text-align: center;
    }

    .about-section h2 {
      font-size: clamp(2rem, 8vw, 4rem);
      letter-spacing: -0.07em;
      line-height: 0.96;
      margin-bottom: 16px;
    }

    .about-section p {
      color: var(--muted);
      font-size: 1.05rem;
      margin-bottom: 14px;
    }

    footer {
      text-align: center;
      padding: 28px 18px 34px;
      color: #777;
      font-size: 0.88rem;
    }

    footer a {
      color: #555;
      text-decoration: none;
      font-weight: 800;
      margin: 0 7px;
    }

   .about-section {
     max-width: 840px;
     margin: 70px auto 0;
     padding: 0 20px;
     text-align: left;
   }
   
   .about-section h2 {
     font-size: clamp(2rem, 4vw, 3.1rem);
     line-height: 1.02;
     letter-spacing: -0.055em;
     margin-bottom: 24px;
     text-align: left;
   }
   
   .about-accordion {
     display: grid;
     gap: 12px;
   }
   
   .about-block {
     background: rgba(255,255,255,0.78);
     border: 1px solid var(--border);
     border-radius: 20px;
     padding: 0;
     box-shadow: 0 16px 35px rgba(0,0,0,0.045);
     overflow: hidden;
   }
   
   .about-block summary {
     list-style: none;
     cursor: pointer;
     padding: 18px 20px;
     font-size: 1rem;
     font-weight: 850;
     letter-spacing: -0.025em;
     color: var(--text);
     display: flex;
     align-items: center;
     justify-content: space-between;
     gap: 16px;
   }
   
   .about-block summary::-webkit-details-marker {
     display: none;
   }
   
   .about-block summary::after {
     content: "+";
     flex: 0 0 auto;
     width: 28px;
     height: 28px;
     border-radius: 999px;
     background: #111111;
     color: #ffffff;
     display: inline-flex;
     align-items: center;
     justify-content: center;
     font-size: 1rem;
     font-weight: 800;
   }
   
   .about-block[open] summary::after {
     content: "−";
   }
   
   .about-block p {
     color: var(--muted);
     font-size: 0.96rem;
     line-height: 1.62;
     margin: 0;
     padding: 0 20px 16px;
   }
   
   .about-block p:last-child {
     padding-bottom: 20px;
   }

    @media (max-width: 860px) {
     .product-layout {
       grid-template-columns: 1fr;
     }
   
     .selector-panel {
       border-left: none;
       border-top: 1px solid var(--border);
     }
   
     .preview-panel {
       min-height: 370px;
       padding: 20px;
       margin-left: 0;
       margin-right: 0;
       width: 100%;
     }
   
     .product-image-wrap {
       max-width: 390px;
       margin: 0 auto;
     }
   
     #product-image {
       max-width: 360px;
       margin: 0 auto;
     }
   
     .preview-badge {
       left: auto;
       right: auto;
       bottom: auto;
       width: 100%;
       max-width: 390px;
       margin: 0 auto;
       text-align: center;
     }
   
     .info-strip {
       grid-template-columns: 1fr 1fr;
       gap: 10px;
       margin-top: 16px;
     }
   
     .info-card {
       padding: 14px;
       border-radius: 18px;
     }
   
     .info-pill {
       margin-bottom: 10px;
     }
   
     .info-card p {
       font-size: 0.84rem;
       line-height: 1.38;
     }
   }
   
   @media (max-width: 600px) {
     .nav {
       padding: 12px 14px;
     }
   
     .nav-links {
       gap: 11px;
       font-size: 0.82rem;
     }
   
     .nav-links a:nth-child(2),
     .nav-links a:nth-child(3) {
       display: none;
     }
   
     .hero {
       padding: 26px 13px 40px;
       gap: 20px;
     }
   
     .hero-copy {
       padding-top: 6px;
     }
   
     .subtagline {
       font-size: 0.96rem;
     }
   
     .shop-shell {
       border-radius: 24px;
     }
   
     .preview-panel {
       min-height: 330px;
       padding: 18px;
       margin-left: 0;
       margin-right: 0;
       width: 100%;
     }
   
     .product-image-wrap {
       max-width: 100%;
       margin: 0 auto;
     }
   
     #product-image {
       max-width: 100%;
       margin: 0 auto;
     }
   
     .preview-badge {
       left: auto;
       right: auto;
       bottom: auto;
       width: 100%;
       max-width: 100%;
       margin: 0 auto;
       text-align: center;
     }
   
     .selector-panel {
       padding: 21px;
     }
   
     .selector-title h2 {
       font-size: 1.55rem;
     }
   
     .model-option {
       padding: 14px;
     }
   
     .color-option {
       width: 46px;
       height: 46px;
     }
   
     .color-swatch {
       width: 37px;
       height: 37px;
     }
   
     .info-strip {
       grid-template-columns: 1fr;
       gap: 10px;
       margin-top: 16px;
     }
   
     .info-card {
       display: flex;
       align-items: flex-start;
       gap: 12px;
       padding: 14px;
       border-radius: 18px;
     }
   
     .info-pill {
       flex: 0 0 auto;
       margin-bottom: 0;
     }
   
     .info-card p {
       font-size: 0.84rem;
       line-height: 1.38;
     }
   
     .selection-summary {
       align-items: flex-start;
     }
   
     .summary-price {
       font-size: 1.2rem;
     }
     .about-section {
    margin-top: 48px;
    padding: 0 13px;
  }

  .about-section h2 {
    font-size: 2rem;
    margin-bottom: 18px;
  }

  .about-block {
    border-radius: 18px;
  }

  .about-block summary {
    padding: 16px;
    font-size: 0.96rem;
  }

  .about-block p {
    padding: 0 16px 14px;
    font-size: 0.9rem;
    line-height: 1.52;
  }

  .about-block p:last-child {
    padding-bottom: 17px;
  }
   }