:root {
    --black: #0a0a0a;
    --dark: #1a1a1a;
    --charcoal: #2d2d2d;
    --gray: #6b6b6b;
    --light-gray: #9a9a9a;
    --bg: #fafafa;
    --off-white: #f5f5f5;
    --border: #e5e5e5;
    --accent: #c9a962;
    --accent-dark: #b89852;
    --white: #ffffff;
    --content-left: 40px;
  }
  /* Wide screens: align carousel first card with centered content left edge */
  @media (min-width: 1281px) {
    :root {
      --content-left: calc((100vw - 1280px) / 2 + 40px);
    }
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }

  /* === Apple Typography System ===
     SF Pro Display: headings & large text (>=20px)
     SF Pro Text: body & small text (<20px)
     Body: 17px / weight 400 / line-height 1.47 / letter-spacing -0.022em
     Headings: weight 600 (semibold, not bold)
  */
  body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    font-weight: 400;
    font-size: 17px;
    color: var(--dark);
    line-height: 1.47;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -0.022em;
  }
  h1, h2, h3, h4 {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
    font-weight: 600;
    letter-spacing: -0.022em;
    color: var(--black);
  }
  a { text-decoration: none; color: inherit; }
  img { display: block; max-width: 100%; }

  /* === Buttons (unified capsule style) === */
  .btn {
    display: inline-block;
    padding: 12px 32px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.01em;
    border: none;
    cursor: pointer;
    border-radius: 999px;
    transition: background 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                color 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                box-shadow 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.3s ease;
  }
  .btn-primary {
    background: var(--white);
    color: var(--accent);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    animation: btnPulse 3s ease-in-out infinite;
  }
  .btn-primary:hover {
    background: var(--accent);
    color: var(--black);
    box-shadow: 0 6px 24px rgba(201, 169, 98, 0.35);
    transform: translateY(-2px);
    animation: none;
  }
  .btn-outline {
    background: transparent;
    color: var(--black);
    border: 1px solid var(--black);
  }
  .btn-outline:hover {
    background: var(--black);
    color: var(--white);
    transform: translateY(-2px);
  }
  @keyframes btnPulse {
    0%, 100% { box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08); }
    50% { box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12); }
  }

  /* === Section Label === */
  .section-label {
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 16px;
  }

  /* === Section 1: Hero + Category Row === */
  .outdoor-hero {
    background: var(--white);
    padding: 140px 40px 80px;
  }
  .hero-container {
    max-width: 1280px;
    margin: 0 auto 48px;
    text-align: left;
  }
  .hero-title {
    font-size: clamp(3.5rem, 8vw, 5rem);
    font-weight: 600;
    letter-spacing: -0.005em;
    line-height: 1.05;
    margin-bottom: 6px;
    color: var(--black);
  }
  .hero-subtitle {
    font-size: clamp(1.15rem, 1.8vw, 1.5rem);
    color: var(--gray);
    font-weight: 400;
    max-width: 800px;
    line-height: 1.21;
    letter-spacing: -0.011em;
  }

  /* Category Row - 6 tiles horizontal */
  .category-row {
    display: flex;
    gap: 20px;
    max-width: 1280px;
    margin: 0 auto;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 8px;
  }
  .category-row::-webkit-scrollbar { display: none; }
  .category-tile {
    flex: 1 1 0;
    min-width: 160px;
    text-align: left;
    scroll-snap-align: start;
    transition: transform 0.4s ease;
  }
  .category-tile:hover { transform: translateY(-4px); }
  .category-tile-image {
    border-radius: 20px;
    overflow: hidden;
    background: var(--off-white);
    aspect-ratio: 1/1;
    margin-bottom: 16px;
  }
  .category-tile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
  }
  .category-tile:hover .category-tile-image img { transform: scale(1.04); }
  .category-tile-name {
    font-size: 17px;
    font-weight: 600;
    color: var(--dark);
    letter-spacing: -0.022em;
  }

  /* === Section 2: Explore the Lineup (carousel, 4.5 visible, full-bleed) === */
  .lineup-section {
    background: var(--off-white);
    padding: 100px 0 100px;
  }
  .lineup-header {
    max-width: 1280px;
    margin: 0 auto 48px;
    padding: 0 px;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
  }
  .lineup-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    letter-spacing: -0.022em;
    line-height: 1.08;
  }
  .lineup-compare {
    font-size: 17px;
    color: var(--accent);
    font-weight: 400;
    transition: color 0.3s;
  }
  .lineup-compare:hover { color: var(--accent-dark); }

  /* Carousel wrapper - full bleed (满屏) */
  .lineup-carousel-wrapper {
    position: relative;
    width: 100%;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0;
  }
  .lineup-nav-btn {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
    position: absolute;
  }
  .lineup-nav-prev { left: 24px; }
  .lineup-nav-next { right: 24px; }
  .lineup-nav-btn:hover {
    background: var(--dark);
    color: var(--white);
    border-color: var(--dark);
  }
  .lineup-carousel {
    flex: 1;
    overflow: hidden;
    border-radius: 0;
    padding-left: var(--content-left);
    touch-action: pan-y;  /* 修改：新增，仅允许垂直滚动交给浏览器，水平手势留给JS轮播，保证系统左右滑动返回手势不受干扰 */
  }
  .lineup-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  }
  /* 修改：新增，lineup圆点指示器（电脑端默认隐藏，手机端显示） */
  .lineup-dots {
    display: none;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    padding: 0 20px;
  }
  .lineup-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.18);
    border: none;
    cursor: pointer;
    padding: 0;
    transition: all 0.3s;
  }
  .lineup-dot.active {
    background: var(--accent);
    width: 24px;
    border-radius: 4px;
  }
  .product-card {
    flex: 0 0 calc((100vw - var(--content-left)) / 4.5);
    min-width: calc((100vw - var(--content-left)) / 4.5);
    padding: 48px 32px;
    text-align: left;
    transition: transform 0.4s ease;
  }
  .product-card:hover { transform: translateY(-4px); }
  .product-card-image {
    border-radius: 24px;
    overflow: hidden;
    background: var(--off-white);
    aspect-ratio: 4/5;
    margin-bottom: 32px;
  }
  .product-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
  }
  .product-card:hover .product-card-image img { transform: scale(1.03); }
  .product-card-name {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--black);
    letter-spacing: -0.022em;
  }
  .product-card-desc {
    font-size: 15px;
    color: var(--gray);
    line-height: 1.47;
    margin-bottom: 16px;
    font-weight: 400;
  }
  .product-card-price {
    font-size: 17px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 24px;
  }
  .product-card .btn { margin-top: 4px; }

  /* === Section 3: Take a Closer Look (video) === */
  .closer-look {
    background: var(--white);
    padding: 100px 0;
  }
  .closer-look-header {
    text-align: left;
    max-width: 1280px;
    margin: 0 auto 64px;
    padding: 0 0px;
  }
  .section-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    letter-spacing: -0.022em;
    line-height: 1.08;
    margin-bottom: 12px;
    color: var(--black);
  }
  .section-subtitle {
    font-size: clamp(1.15rem, 1.8vw, 1.5rem);
    color: var(--gray);
    font-weight: 400;
    letter-spacing: -0.011em;
    line-height: 1.21;
  }
  .video-card {
    max-width: 1280px;
    margin: 0 auto;
    border-radius: 24px;
    overflow: hidden;
    background: var(--black);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  }
  .video-placeholder {
    position: relative;
    aspect-ratio: 16/9;
    background: var(--black);
    cursor: pointer;
  }
  .video-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
  }
  .video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--black);
    transition: transform 0.3s ease, background 0.3s ease;
  }
  .video-play-btn:hover {
    transform: translate(-50%, -50%) scale(1.1);
    background: var(--white);
  }

  /* === Video Fullscreen Modal === */
  .video-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 60px 40px;
  }
  .video-modal.active {
    display: flex;
  }
  .video-modal-content {
    position: relative;
    width: 100%;
    max-width: 1280px;
    aspect-ratio: 16/9;
  }
  .video-modal-content video {
    width: 100%;
    height: 100%;
    border-radius: 12px;
    background: #000;
  }
  .video-modal-close {
    position: absolute;
    top: -52px;
    right: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
  }
  .video-modal-close:hover {
    background: rgba(255, 255, 255, 0.4);
  }

  /* === Section 4 & 5: Category Hero (full-height image with overlay) === */
  .category-hero {
    position: relative;
    overflow: hidden;
    background: var(--black);
  }
  .category-hero-spacer {
    height: 48px;
    background: var(--white);
  }
  .category-hero-image {
    position: relative;
    z-index: 1;
    width: 100%;
  }
  .category-hero-image img {
    width: 100%;
    height: auto;
    display: block;
    opacity: 0.6;
  }
  .category-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    padding: 0 80px;
  }
  .category-hero-content {
    max-width: 520px;
  }
  .category-hero-content .section-label {
    color: var(--accent);
  }
  .category-hero-content h2 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
    line-height: 1.08;
    letter-spacing: -0.022em;
  }
  .category-hero-desc {
    font-size: 19px;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.47;
    margin-bottom: 32px;
    font-weight: 400;
    letter-spacing: -0.011em;
  }
  .category-hero-alt .category-hero-overlay {
    justify-content: flex-end;
  }

  /* === Section 6: Why LUNQHAL === */
  .why-section {
    background: var(--white);
    padding: 100px 0;
  }
  .why-header {
    text-align: center;
    max-width: 1280px;
    margin: 0 auto 64px;
    padding: 0 40px;
  }
  .why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 40px;
  }
  .why-card {
    text-align: center;
    padding: 32px 20px;
  }
  .why-icon {
    color: var(--accent);
    margin-bottom: 24px;
    display: flex;
    justify-content: center;
  }
  .why-card h3 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--black);
    letter-spacing: -0.022em;
  }
  .why-card p {
    font-size: 15px;
    color: var(--gray);
    line-height: 1.47;
    font-weight: 400;
  }

  /* === Responsive === */
  @media (max-width: 1024px) {
    .category-tile { min-width: 140px; }
    .product-card {
      flex: 0 0 calc((100vw - var(--content-left)) / 2.5);
      min-width: calc((100vw - var(--content-left)) / 2.5);
    }
    .why-grid { grid-template-columns: repeat(2, 1fr); }
  }

  /* === Tablet & Mobile (<=768px) === */
  @media (max-width: 768px) {
    :root { --content-left: 20px; }

    /* Section 1: Hero + Categories */
    .outdoor-hero { padding: 100px 20px 48px; }
    .outdoor-hero { padding: calc(100px + env(safe-area-inset-top, 0px)) 20px 48px; }  /* 修改：新增，iPhone刘海屏顶部叠加安全区 */
    .hero-container { margin-bottom: 32px; }
    .hero-title {
      font-size: 2.5rem;
      letter-spacing: 0;
      margin-bottom: 4px;
    }
    .hero-subtitle {
      font-size: 1.1rem;
      line-height: 1.3;
    }
    .category-row {
      display: grid;  /* 修改：从横向滚动flex改为grid网格 */
      grid-template-columns: repeat(3, 1fr);  /* 修改：一行三张卡片，6张自动排成两行 */
      gap: 12px;
      overflow: visible;  /* 修改：取消横向滚动 */
      scroll-snap-type: none;  /* 修改：取消滚动吸附 */
      margin: 0;  /* 修改：取消负margin全宽出血（grid不需要） */
      padding: 0 0 8px;
    }
    .category-tile { min-width: 0; }  /* 修改：覆盖flex的min-width，防止三列被撑破 */
    .category-tile-image {
      aspect-ratio: 1/1;
      border-radius: 16px;
      margin-bottom: 10px;
    }
    .category-tile-name { font-size: 14px; }

    /* Section 2: Lineup */
    .lineup-section { padding: 60px 0; }
    .lineup-nav-btn { width: 36px; height: 36px; }
    .lineup-header {
      flex-direction: column;
      gap: 8px;
      align-items: flex-start;
      text-align: left;
      margin: 0 auto 32px;
      padding: 0 20px;
    }
    .lineup-title { font-size: 1.75rem; }
    .lineup-compare { font-size: 15px; }
    .lineup-dots { display: flex; }  /* 修改：新增，手机端启用圆点指示器显示 */
    .product-card {
      flex: 0 0 calc((100vw - var(--content-left)) / 1.3);
      min-width: calc((100vw - var(--content-left)) / 1.3);
      padding: 24px 20px;
    }
    .product-card-image {
      aspect-ratio: 4/5;
      border-radius: 16px;
      margin-bottom: 20px;
    }
    .product-card-name { font-size: 18px; }
    .product-card-desc { font-size: 14px; margin-bottom: 12px; }
    .product-card-price { font-size: 15px; margin-bottom: 16px; }
    .product-card .btn { padding: 10px 24px; font-size: 11px; }
    .lineup-nav-btn {
      width: 36px;
      height: 36px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.1);
    }
    .lineup-nav-prev { left: 8px; }
    .lineup-nav-next { right: 8px; }

    /* Section 3: Video */
    .closer-look { padding: 60px 0; }
    .closer-look-header { margin: 0 auto 32px; padding: 0 20px; }
    .section-title { font-size: 1.75rem; }
    .section-subtitle { font-size: 1.1rem; }
    .video-card { border-radius: 16px; }
    .video-play-btn { width: 60px; height: 60px; }
    .video-play-btn svg { width: 24px; height: 24px; }

    /* Section 4 & 5: Category Heroes */
    .category-hero-spacer { height: 24px; }
    .category-hero {
      display: flex;
      flex-direction: column;  /* 修改：手机端改为纵向排列，文字块显示在图片上方 */
    }
    .category-hero-image img {
      opacity: 1;  /* 修改：文字不再叠在图片上，图片恢复全不透明显示 */
    }
    .category-hero-overlay {
      position: relative;  /* 修改：从绝对定位覆盖改为正常文档流 */
      order: -1;           /* 修改：置于图片之前（文字显示在图片上方） */
      display: block;      /* 修改：不再flex垂直居中 */
      padding: 0;
    }
    .category-hero-content {
      max-width: 100%;
      padding: 28px 20px;  /* 修改：新增，文字块内边距 */
    }
    .category-hero .category-hero-content {
      background: rgb(37, 77, 115);  /* 修改：新增，拾取Security图片顶部颜色作文字背景（sl016-entryway-t3.jpg顶部平均色） */
    }
    .category-hero-alt .category-hero-content {
      background: rgb(1, 21, 63);  /* 修改：新增，拾取Wall & Porch图片顶部颜色作文字背景（sl015-outdoor-t2.png顶部平均色） */
    }
    .category-hero-content h2 { font-size: 1.75rem; margin-bottom: 12px; }
    .category-hero-desc {
      font-size: 15px;
      line-height: 1.47;
      margin-bottom: 24px;
    }
    .category-hero-content .btn { padding: 10px 24px; font-size: 11px; }
    .category-hero-alt .category-hero-overlay { justify-content: flex-start; }

    /* Section 6: Why */
    .why-section { padding: 60px 0; }
    .why-header { margin-bottom: 40px; }
    .why-grid { grid-template-columns: 1fr; gap: 32px; }
    .why-card { padding: 24px 16px; }
    .why-card h3 { font-size: 18px; }
    .why-card p { font-size: 14px; }
    .why-icon svg { width: 32px; height: 32px; }
    /* 修改：Why LUNQHAL 图标改为 img 后，移动端同步缩小到 32px（与原SVG一致） */
    .why-icon img { width: 32px; height: 32px; }

    /* Video Modal */
    .video-modal { padding: 40px 16px; }
    .video-modal-close { top: -40px; width: 36px; height: 36px; }
  }

  /* === Small phones (<=480px) === */
  @media (max-width: 480px) {
    :root { --content-left: 16px; }
    .outdoor-hero { padding: 90px 16px 40px; }
    .outdoor-hero { padding: calc(90px + env(safe-area-inset-top, 0px)) 16px 40px; }  /* 修改：新增，iPhone刘海屏顶部叠加安全区 */
    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1rem; }
    .category-row {
      display: grid;  /* 修改：从横向滚动flex改为grid网格 */
      grid-template-columns: repeat(3, 1fr);  /* 修改：一行三张卡片，6张自动排成两行 */
      gap: 10px;
      overflow: visible;  /* 修改：取消横向滚动 */
      scroll-snap-type: none;  /* 修改：取消滚动吸附 */
      margin: 0;  /* 修改：取消负margin全宽出血 */
      padding: 0 0 8px;
    }
    .category-tile { min-width: 0; }  /* 修改：覆盖flex的min-width */
    .category-tile-image { border-radius: 14px; margin-bottom: 8px; }
    .category-tile-name { font-size: 13px; }

    .lineup-title { font-size: 1.5rem; }
    .lineup-header { padding: 0 16px; }
    .product-card {
      flex: 0 0 calc((100vw - var(--content-left)) / 1.1);
      min-width: calc((100vw - var(--content-left)) / 1.1);
      padding: 20px 16px;
    }
    .product-card-image { border-radius: 14px; margin-bottom: 16px; }
    .product-card-name { font-size: 16px; }
    .product-card-desc { font-size: 13px; }

    .closer-look { padding: 48px 0; }
    .closer-look-header { padding: 0 16px; }
    .section-title { font-size: 1.5rem; }
    .section-subtitle { font-size: 1rem; }
    .video-play-btn { width: 52px; height: 52px; }
    .video-play-btn svg { width: 20px; height: 20px; }

    .category-hero-overlay { padding: 0; }  /* 修改：保持与content背景贴边一致 */
    .category-hero-content { padding: 24px 16px; }  /* 修改：配合480px页边距，背景贴边 */
    .category-hero-content h2 { font-size: 1.5rem; }
    .category-hero-desc { font-size: 14px; }

    .why-section { padding: 48px 0; }
    .why-card { padding: 20px 12px; }
    .why-card h3 { font-size: 17px; }

  }