:root {
      --ink: #252525;
      --muted: #626262;
      --line: #dedede;
      --soft: #f7f7f5;
      --accent: #2c7c78;
      --accent-soft: #eaf4f2;
      --warm: #b77945;
      --max: 1220px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: #fff;
      font-family: "Montserrat", "Montserrat Light", Arial, sans-serif;
      font-weight: 300;
      font-size: 18px;
      line-height: 1.5;
      letter-spacing: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    a { color: inherit; }
    img { display: block; max-width: 100%; }
    .container { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin: 0 0 18px;
      color: var(--accent);
      font-size: 14px;
      font-weight: 700;
      letter-spacing: .08em;
      text-transform: uppercase;
    }
    .eyebrow::before {
      content: "";
      width: 34px;
      height: 2px;
      background: var(--accent);
    }
    h1, h2, h3, p { overflow-wrap: anywhere; }
    h1, h2, h3 { line-height: 1.5; letter-spacing: 0; }
    /* 排版标准：主标题 60px 加粗满宽自动换行；正文标题 48px 加粗；副标题 20px；内容 18px；行高统一 1.5 */
    h1 {
      width: 100%;
      max-width: 100%;
      margin: 0;
      font-family: "Montserrat", "Montserrat Light", Arial, sans-serif;
      font-size: 60px;
      font-weight: 700;
    }
    h2 {
      width: 100%;
      max-width: 100%;
      margin: 0;
      font-family: "Montserrat", "Montserrat Light", Arial, sans-serif;
      font-size: 48px;
      font-weight: 700;
    }
    h3 {
      width: 100%;
      max-width: 100%;
      margin: 0 0 12px;
      font-family: "Montserrat", "Montserrat Light", Arial, sans-serif;
      font-size: 48px;
      font-weight: 700;
    }
    p { margin: 0; }

    /* 首屏已删除 03/03/01 事实条，主标题恢复 60px 满宽，同时收紧首屏节奏以压缩标题占比 */
    .hero {
      padding: 56px 0 48px;
      border-bottom: 1px solid var(--line);
      background:
        linear-gradient(90deg, rgba(255,255,255,.98) 0%, rgba(255,255,255,.92) 51%, rgba(247,247,245,.82) 100%),
        url("//ueeshop.ly200-cdn.com/u_file/UPBI/UPBI946/2607/02/products/Ferrocene-1053431bf7.jpg?x-oss-process=image/quality,q_100") center / cover no-repeat;
    }
    .hero-inner { display: grid; gap: 0; }
    .hero-copy { width: 100%; max-width: 100%; }
    .hero-copy > p {
      width: 100%;
      max-width: 100%;
      margin-top: 18px;
      color: var(--muted);
      font-size: 20px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 24px;
    }
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 52px;
      padding: 12px 24px;
      border: 1px solid var(--ink);
      border-radius: 2px;
      color: #fff;
      background: var(--ink);
      font-family: "Montserrat", "Montserrat Light", Arial, sans-serif;
      font-size: 18px;
      font-weight: 700;
      text-decoration: none;
    }
    .button.alt {
      color: var(--ink);
      background: transparent;
    }

    .section { padding: 88px 0; }
    .section.soft { background: var(--soft); }
    .section-head { width: 100%; margin-bottom: 38px; }
    .section-head p {
      width: 100%;
      max-width: 100%;
      margin-top: 18px;
      color: var(--muted);
      font-size: 20px;
    }

    .solution-list { display: grid; gap: 24px; }
    .solution {
      display: grid;
      grid-template-columns: 260px 1fr;
      gap: 32px;
      padding: 28px;
      border: 1px solid var(--line);
      background: #fff;
    }
    .solution-media {
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 238px;
      padding: 20px;
      background: var(--soft);
      border-top: 3px solid var(--accent);
    }
    .solution:nth-child(2) .solution-media { border-top-color: var(--warm); }
    .solution:nth-child(3) .solution-media { border-top-color: var(--ink); }
    .solution-media img { max-height: 190px; object-fit: contain; mix-blend-mode: multiply; }
    .solution h3 { font-size: 24px; }
    .solution-lead { margin-bottom: 18px; color: var(--muted); font-size: 18px; }
    .dose {
      display: inline-block;
      margin: 4px 0 18px;
      padding: 9px 14px;
      border-left: 3px solid var(--accent);
      background: var(--accent-soft);
      font-size: 18px;
      font-weight: 700;
    }
    .solution:nth-child(2) .dose { border-left-color: var(--warm); background: #fbf3ed; }
    .solution:nth-child(3) .dose { border-left-color: var(--ink); background: #ededed; }
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px 28px;
      margin-top: 18px;
    }
    .detail { padding-top: 14px; border-top: 1px solid var(--line); }
    .detail strong { display: block; margin-bottom: 4px; font-size: 18px; font-weight: 700; }
    .detail span { color: var(--muted); font-size: 18px; }
    .solution-links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 22px; }
    .text-link {
      color: var(--accent);
      font-size: 18px;
      font-weight: 700;
      text-underline-offset: 4px;
    }

    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; min-width: 980px; border-collapse: collapse; font-size: 18px; }
    caption {
      position: absolute;
      width: 1px;
      height: 1px;
      overflow: hidden;
      clip: rect(0 0 0 0);
    }
    th, td {
      padding: 16px 18px;
      border: 1px solid var(--line);
      text-align: left;
      vertical-align: top;
      line-height: 1.5;
    }
    th {
      color: #fff;
      background: var(--ink);
      font-weight: 700;
    }
    td:first-child { font-weight: 700; }
    .table-note { margin-top: 16px; color: var(--muted); font-size: 18px; }

    .check-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }
    .check {
      padding: 24px;
      border: 1px solid var(--line);
      border-top: 3px solid var(--accent);
      background: #fff;
    }
    .check:nth-child(2) { border-top-color: var(--warm); }
    .check:nth-child(3) { border-top-color: var(--ink); }
    .check h3 { font-size: 24px; }
    .check p { color: var(--muted); font-size: 18px; }

    .faq-list { display: grid; gap: 14px; }
    details {
      border-bottom: 1px solid var(--line);
      padding: 0 0 14px;
    }
    summary {
      cursor: pointer;
      list-style: none;
      padding: 14px 42px 14px 0;
      position: relative;
      font-size: 20px;
      font-weight: 700;
    }
    summary::-webkit-details-marker { display: none; }
    summary::after {
      content: "+";
      position: absolute;
      top: 8px;
      right: 4px;
      color: var(--accent);
      font-size: 30px;
      font-weight: 300;
    }
    details[open] summary::after { content: "−"; }
    details p { width: 100%; max-width: 100%; padding: 0 42px 12px 0; color: var(--muted); font-size: 18px; }

    .cta {
      padding: 72px 0;
      border-top: 1px solid var(--line);
      background: #fff;
    }
    .cta-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 36px;
    }
    .cta-copy { width: 100%; max-width: 100%; }
    .cta h2 { font-size: 48px; }
    .cta p { margin-top: 14px; color: var(--muted); font-size: 20px; }
    .footer-note {
      padding: 20px 0 28px;
      color: #777;
      font-size: 14px;
      text-align: center;
    }

    @media (max-width: 900px) {
      .hero { padding: 72px 0 64px; }
      .solution { grid-template-columns: 1fr; }
      .solution-media { min-height: 220px; }
      .check-grid { grid-template-columns: 1fr; }
      .cta-inner { display: grid; }
    }
    @media (max-width: 640px) {
      .container { width: min(calc(100% - 28px), var(--max)); }
      h1 { font-size: 60px; }
      h2 { font-size: 48px; }
      h3 { font-size: 48px; }
      .hero-copy > p, .section-head p, .cta p { font-size: 20px; }
      .solution { padding: 20px; }
      .solution-grid { grid-template-columns: 1fr; }
      .solution h3 { font-size: 24px; }
      .check h3 { font-size: 24px; }
      .hero-actions .button { width: 100%; }
      .cta h2 { font-size: 48px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
    }