/* ----- reset & base ----- */
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      background: #ffffff;
      color: #1e1f2a;
      line-height: 1.6;
      padding: 0;
      margin: 0;
    }
    :root {
      --primary: #009544;
      --primary-dark: #007a38;
      --primary-light: #e6f5ed;
      --primary-glow: rgba(0, 149, 68, 0.10);
      --text-dark: #1e1f2a;
      --text-muted: #3d3f4a;
      --border-light: #e9eaed;
      --bg-soft: #f8f9fb;
      --white: #ffffff;
      --shadow-card: 0 8px 28px rgba(0, 20, 10, 0.07);
      --radius: 20px;
    }
    .page-wrap { max-width: 1500px; margin: 0 auto; padding: 20px 20px 40px; }
    .flex-row { display: flex; flex-wrap: wrap; gap: 28px; }
    .flex-col { flex: 1 1 280px; }
    .text-center { text-align: center; }
    .badge-label {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.6px;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 16px;
      border-radius: 30px;
      text-transform: uppercase;
      margin-bottom: 8px;
    }
    .heading-main {
      font-size: 2.6rem;
      font-weight: 700;
      line-height: 1.15;
      color: var(--text-dark);
      margin: 8px 0 16px;
      letter-spacing: -0.02em;
    }
    .heading-main span { color: var(--primary); }
    .heading-sub { font-size: 1.9rem; font-weight: 600; color: var(--text-dark); margin-bottom: 12px; }
    .heading-section { font-size: 1.6rem; font-weight: 600; color: var(--text-dark); margin: 16px 0 8px; }
    .text-body { color: var(--text-muted); max-width: 780px; margin: 12px 0 20px; }
    .text-small { font-size: 0.95rem; color: var(--text-muted); }

    /* ----- cards & blocks ----- */
    .section-block {
      background: var(--white);
      border-radius: var(--radius);
      padding: 32px 28px;
      margin-bottom: 28px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
    }
    .section-block--soft { background: var(--bg-soft); }
    .section-block--highlight { border-left: 6px solid var(--primary); background: var(--primary-light); }
    .section-block--dark { background: #1e2a24; color: #f0f3f0; border-color: #2f3f36; }
    .section-block--dark .text-body { color: #cfd9d3; }
    .section-block--dark .badge-label { background: rgba(255,255,255,0.12); color: #a5d9b0; }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin: 18px 0 8px;
    }
    .feature-card {
      background: var(--white);
      padding: 20px 16px;
      border-radius: 16px;
      border: 1px solid var(--border-light);
      transition: 0.2s ease;
    }
    .feature-card:hover { border-color: var(--primary); box-shadow: 0 4px 14px var(--primary-glow); }
    .feature-title { font-weight: 600; font-size: 1.1rem; color: var(--text-dark); margin-bottom: 4px; }
    .feature-desc { font-size: 0.95rem; color: var(--text-muted); }

    .stat-row {
      display: flex;
      flex-wrap: wrap;
      gap: 24px 48px;
      background: var(--bg-soft);
      padding: 20px 24px;
      border-radius: 20px;
      margin: 16px 0 8px;
      border: 1px solid var(--border-light);
    }
    .stat-item { flex: 1 0 120px; }
    .stat-value { font-size: 1.8rem; font-weight: 700; color: var(--primary); line-height: 1.2; }
    .stat-label { font-size: 0.9rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.3px; }

    .spec-table-wrap { overflow-x: auto; margin: 16px 0 8px; border-radius: 16px; border: 1px solid var(--border-light); }
    .spec-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; background: var(--white); }
    .spec-table th { background: var(--bg-soft); text-align: left; padding: 14px 16px; font-weight: 600; color: var(--text-dark); border-bottom: 2px solid var(--border-light); }
    .spec-table td { padding: 12px 16px; border-bottom: 1px solid var(--border-light); color: var(--text-muted); }
    .spec-table tr:last-child td { border-bottom: none; }

    .check-list { list-style: none; padding: 0; margin: 16px 0 8px; }
    .check-list li { display: flex; gap: 10px; align-items: flex-start; padding: 8px 0; border-bottom: 1px dashed var(--border-light); }
    .check-list li:last-child { border-bottom: none; }
    .check-list .marker { display: inline-block; width: 6px; height: 6px; background: var(--primary); border-radius: 50%; margin-top: 12px; flex-shrink: 0; }
    .list-title { font-weight: 600; color: var(--text-dark); }

    .btn-primary {
      display: inline-block;
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 60px;
      text-decoration: none;
      border: none;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s;
      box-shadow: 0 4px 10px rgba(0, 149, 68, 0.25);
    }
    .btn-primary:hover { background: var(--primary-dark); transform: scale(1.01); }
    .btn-outline {
      display: inline-block;
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 60px;
      border: 1.5px solid var(--primary);
      text-decoration: none;
      font-size: 1rem;
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-outline:hover { background: var(--primary-light); border-color: var(--primary-dark); }
    .btn-group { display: flex; flex-wrap: wrap; gap: 14px; margin: 20px 0 8px; }

    .split-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
    @media (max-width: 780px) {
      .split-layout { grid-template-columns: 1fr; gap: 20px; }
      .heading-main { font-size: 2rem; }
      .section-block { padding: 24px 16px; }
    }

    .faq-item { border-bottom: 1px solid var(--border-light); padding: 14px 0; }
    .faq-item:last-child { border-bottom: none; }
    .faq-q { font-weight: 600; color: var(--text-dark); display: flex; gap: 8px; }
    .faq-q .q-badge { color: var(--primary); font-weight: 700; }
    .faq-a { color: var(--text-muted); padding-left: 28px; margin-top: 4px; font-size: 0.96rem; }

    .highlight-box { background: var(--primary-light); padding: 18px 22px; border-radius: 16px; border-left: 4px solid var(--primary); margin: 16px 0 8px; }
    .highlight-box strong { color: var(--primary-dark); }

    /* ----- chart / graph (纯CSS模拟折线图) ----- */
    .chart-container {
      background: var(--white);
      border-radius: 16px;
      padding: 20px 16px 12px;
      border: 1px solid var(--border-light);
      margin: 16px 0 8px;
    }
    .chart-bars {
      display: flex;
      align-items: flex-end;
      justify-content: space-around;
      height: 140px;
      gap: 12px;
      padding: 0 4px;
    }
    .chart-bar {
      display: flex;
      flex-direction: column;
      align-items: center;
      flex: 1;
    }
    .chart-bar .bar {
      width: 100%;
      max-width: 40px;
      background: var(--primary);
      border-radius: 6px 6px 0 0;
      min-height: 8px;
      transition: height 0.2s;
    }
    .chart-bar .bar-label {
      font-size: 0.7rem;
      text-align: center;
      margin-top: 6px;
      color: var(--text-muted);
      font-weight: 500;
    }
    .chart-bar .bar-value {
      font-size: 0.7rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 4px;
    }
    .chart-line {
      position: relative;
      height: 120px;
      margin: 20px 0 8px;
      border-bottom: 2px dashed var(--border-light);
      display: flex;
      align-items: flex-end;
      justify-content: space-around;
      padding: 0 8px;
    }
    .line-point {
      display: flex;
      flex-direction: column;
      align-items: center;
      flex: 1;
    }
    .line-point .dot {
      width: 12px;
      height: 12px;
      background: var(--primary);
      border-radius: 50%;
      border: 2px solid white;
      box-shadow: 0 0 0 2px var(--primary);
      margin-bottom: 4px;
    }
    .line-point .label {
      font-size: 0.65rem;
      color: var(--text-muted);
      text-align: center;
      margin-top: 4px;
    }

    /* 兼容性表格 - 带彩色标记 */
    .compat-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
      gap: 10px;
      margin: 16px 0 8px;
    }
    .compat-item {
      background: var(--bg-soft);
      border-radius: 40px;
      padding: 8px 14px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      border: 1px solid var(--border-light);
    }
    .compat-item .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      flex-shrink: 0;
    }
    .dot-green { background: var(--primary); }
    .dot-yellow { background: #e6b800; }
    .dot-red { background: #c93a3a; }

    /* 稀释计算器 */
    .calc-box {
      background: var(--bg-soft);
      padding: 20px 24px;
      border-radius: 18px;
      border: 1px solid var(--border-light);
      display: flex;
      flex-wrap: wrap;
      align-items: flex-end;
      gap: 16px 24px;
      margin: 16px 0 8px;
    }
    .calc-box label {
      font-weight: 500;
      font-size: 0.9rem;
      color: var(--text-dark);
      display: flex;
      flex-direction: column;
      gap: 4px;
      flex: 1 1 140px;
    }
    .calc-box input {
      padding: 10px 14px;
      border: 1px solid var(--border-light);
      border-radius: 40px;
      font-size: 1rem;
      background: white;
      width: 100%;
      outline: none;
    }
    .calc-box input:focus { border-color: var(--primary); }
    .calc-result {
      background: var(--primary-light);
      padding: 10px 20px;
      border-radius: 40px;
      font-weight: 600;
      color: var(--primary-dark);
      font-size: 1.1rem;
      flex: 1 1 180px;
      text-align: center;
    }

    .mt-8 { margin-top: 8px; }
    .mt-16 { margin-top: 16px; }
    .mb-8 { margin-bottom: 8px; }
    .mb-16 { margin-bottom: 16px; }
    .intro-text p { margin-bottom: 12px; }

    /* ----- 新增板块样式 (About / Certifications / Related Products / Related Info) ----- */
    .about-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      margin-bottom: 28px;
    }
    @media (max-width: 780px) {
      .about-wrapper { grid-template-columns: 1fr; }
    }
    .about-left {
      position: relative;
      border-radius: var(--radius);
      overflow: hidden;
      background: var(--bg-soft);
      min-height: 240px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .about-left img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius);
    }
    .about-play {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      cursor: pointer;
      width: 64px;
      height: 64px;
      background: rgba(0,149,68,0.85);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: 0.2s;
      border: 2px solid white;
    }
    .about-play:hover { transform: translate(-50%, -50%) scale(1.08); }
    .about-play img { width: 28px; height: 28px; display: block; border-radius: 0; }

    .about-right .about-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .about-right .about-title em { color: var(--primary); font-style: normal; }
    .about-right .about-text { color: var(--text-muted); font-size: 1rem; margin: 16px 0 20px; }
    .about-stats {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
      margin: 16px 0 20px;
    }
    .about-stats li {
      list-style: none;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
    }
    .about-stats li span { font-size: 1rem; font-weight: 400; color: var(--text-muted); }
    .about-stats li p { font-size: 0.85rem; font-weight: 400; color: var(--text-muted); margin-top: 2px; }
    .btn-go {
      display: inline-block;
      background: var(--primary);
      color: white;
      padding: 10px 28px;
      border-radius: 40px;
      text-decoration: none;
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-go:hover { background: var(--primary-dark); }

  /* ----- 认证板块样式 (左侧描述 + 右侧图片轮播) ----- */
.cert-section {
    background: #1e2a24;
    border-radius: var(--radius);
    padding: 40px 28px;
    margin-bottom: 28px;
    color: #f0f3f0;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200" opacity="0.04"><path d="M50 20 L70 40 L50 60 L30 40 Z M120 30 L140 50 L120 70 L100 50 Z M30 90 L50 110 L30 130 L10 110 Z M100 80 L120 100 L100 120 L80 100 Z M160 80 L180 100 L160 120 L140 100 Z M60 130 L80 150 L60 170 L40 150 Z M140 140 L160 160 L140 180 L120 160 Z"/></svg>');
    background-repeat: no-repeat;
    background-position: right bottom;
}
.cert-inner {
    max-width: 1260px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
}
@media (max-width: 920px) {
    .cert-inner { grid-template-columns: 1fr; }
}

/* 左侧 */
.cert-left {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 24px;
}
.cert-title {
    font-size: 2rem;
    font-weight: 700;
    color: #f0f3f0;
    line-height: 1.2;
    margin-bottom: 8px;
}
.cert-text {
    color: #cfd9d3;
    max-width: 480px;
}
.cert-text p { margin-bottom: 6px; }

.cert-logos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 12px 16px;
    align-items: center;
    margin-top: 8px;
}
.cert-logos-grid img {
    max-width: 100px;
    max-height: 50px;
    object-fit: contain;
    background: rgba(255,255,255,0.06);
    padding: 6px 10px;
    border-radius: 6px;
    filter: brightness(0.9);
    transition: 0.2s;
}
.cert-logos-grid img:hover {
    filter: brightness(1.1);
    background: rgba(255,255,255,0.12);
}

/* 右侧轮播容器 */
.cert-right {
    position: relative;
    min-height: 280px;
}
.cert-carousel {
    position: relative;
    overflow: hidden;
    border-radius: 14px;
    background: rgba(255,255,255,0.04);
    padding: 12px 0 40px;
}
.cert-carousel-track {
    display: flex;
    transition: transform 0.4s ease;
    will-change: transform;
}
.cert-slide {
    flex: 0 0 100%;
    padding: 0 10px;
    box-sizing: border-box;
}
.cert-slide-imgbox {
    background: rgba(255,255,255,0.06);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 220px;
    border: 1px solid rgba(255,255,255,0.08);
}
.cert-slide-imgbox img {
    width: 100%;
    height: auto;
    max-height: 320px;
    object-fit: contain;
    display: block;
    border-radius: 12px;
    transition: 0.3s;
}
.cert-slide-imgbox img:hover {
    transform: scale(1.02);
}

/* 轮播控制 */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,149,68,0.7);
    color: white;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.4rem;
    cursor: pointer;
    transition: 0.2s;
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}
.carousel-btn:hover {
    background: #009544;
}
.carousel-btn-prev { left: 4px; }
.carousel-btn-next { right: 4px; }

.carousel-dots {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 5;
}
.carousel-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.25);
    cursor: pointer;
    transition: 0.2s;
}
.carousel-dots span.active {
    background: #009544;
    width: 24px;
    border-radius: 6px;
}

    /* related products */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
      margin: 16px 0 8px;
    }
    .product-card {
      background: var(--white);
      border-radius: 16px;
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: 0.2s;
      text-align: center;
      padding-bottom: 16px;
    }
    .product-card:hover { box-shadow: 0 8px 24px var(--primary-glow); border-color: var(--primary); }
    .product-card .card-image { width: 100%; aspect-ratio: 1/1; overflow: hidden; background: var(--bg-soft); }
    .product-card .card-image img { width: 100%; height: 100%; object-fit: cover; display: block; }
    .product-card .card-content { padding: 12px 12px 4px; }
    .product-card .card-title { font-size: 0.95rem; font-weight: 600; color: var(--text-dark); margin: 4px 0 8px; }
    .product-card .card-title a { color: var(--text-dark); text-decoration: none; }
    .product-card .card-title a:hover { color: var(--primary); }
    .product-card .card-link { font-size: 0.85rem; color: var(--primary); text-decoration: none; font-weight: 500; }

    /* related info (tags) */
    .info-list {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
      gap: 20px;
      margin: 16px 0 8px;
    }
    .info-item {
      background: var(--bg-soft);
      border-radius: 16px;
      padding: 16px 18px;
      border: 1px solid var(--border-light);
      transition: 0.2s;
    }
    .info-item:hover { border-color: var(--primary); }
    .info-item h3 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
    .info-item h3 a { color: var(--text-dark); text-decoration: none; }
    .info-item h3 a:hover { color: var(--primary); }
    .info-item p { font-size: 0.9rem; color: var(--text-muted); margin: 0; }