/* roulang page: index */
:root {
      color-scheme: light;
      --ink: #20231f;
      --muted: #696d65;
      --paper: #f5f4ef;
      --white: #fffefa;
      --line: #deded5;
      --green: #315b46;
      --green-dark: #234334;
      --lime: #d6e86e;
      --coral: #e8795d;
      --soft-green: #e8eee6;
      --soft-coral: #f7e8e2;
      --radius: 7px;
      --shadow: 0 12px 32px rgba(30, 36, 28, .08);
      --container: 1180px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 84px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      font-size: 16px;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button { cursor: pointer; }
    img { display: block; max-width: 100%; }
    :focus-visible { outline: 3px solid var(--coral); outline-offset: 3px; }
    .container { width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }
    .topbar {
      position: sticky; top: 0; z-index: 20;
      background: rgba(255, 254, 250, .96);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(12px);
    }
    .nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
    .brand { display: inline-flex; align-items: center; gap: 12px; min-width: 0; font-weight: 800; line-height: 1.25; }
    .brand-mark {
      width: 42px; height: 42px; flex: 0 0 42px; display: grid; place-items: center;
      border-radius: 6px; background: var(--green); color: var(--lime); font-size: 17px; letter-spacing: 0;
    }
    .brand-name { max-width: 260px; font-size: 15px; }
    .nav-links { display: flex; align-items: center; gap: 26px; margin: 0; padding: 0; list-style: none; }
    .nav-links a { color: #565a52; font-size: 14px; transition: color .2s ease; }
    .nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--green); }
    .nav-age { padding: 7px 11px; border: 1px solid var(--line); border-radius: 4px; color: var(--green); font-size: 12px; font-weight: 700; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 5px; background: var(--white); color: var(--ink); }
    .hero {
      position: relative; min-height: 545px; display: flex; align-items: center; overflow: hidden;
      color: var(--white); background: #191b18;
      isolation: isolate;
    }
    .hero::before {
      content: ""; position: absolute; inset: 0; z-index: -1;
      background:
        linear-gradient(90deg, rgba(21, 25, 21, .94) 0%, rgba(21, 25, 21, .78) 48%, rgba(21, 25, 21, .2) 100%),
        radial-gradient(ellipse at 77% 39%, rgba(214, 232, 110, .34), transparent 24%),
        linear-gradient(135deg, #344e3c 0%, #202822 48%, #171916 100%);
    }
    .hero::after {
      content: ""; position: absolute; z-index: -1; right: 8%; top: 12%; width: 35%; height: 76%;
      border: 1px solid rgba(255,255,255,.18); border-radius: 48% 48% 5px 5px;
      transform: rotate(8deg);
      background: linear-gradient(145deg, rgba(214,232,110,.16), rgba(232,121,93,.12) 55%, transparent 56%);
    }
    .hero-inner { position: relative; padding-block: 62px 76px; }
    .hero-kicker { display: inline-flex; align-items: center; gap: 9px; color: var(--lime); font-size: 13px; font-weight: 700; }
    .hero-kicker::before { content: ""; width: 24px; height: 2px; background: var(--lime); }
    h1 { max-width: 780px; margin: 20px 0 16px; font-size: clamp(38px, 5vw, 64px); line-height: 1.16; font-weight: 800; }
    h1 em { color: var(--lime); font-style: normal; }
    .hero-copy { max-width: 690px; margin: 0; color: rgba(255,255,255,.82); font-size: 16px; line-height: 1.9; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
    .button {
      min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 9px;
      padding: 0 18px; border: 1px solid transparent; border-radius: 4px; font-weight: 700; font-size: 14px;
      transition: background .2s ease, color .2s ease, transform .2s ease, border-color .2s ease;
    }
    .button:hover { transform: translateY(-2px); }
    .button:active { transform: translateY(0); }
    .button-primary { background: var(--lime); color: #20251d; }
    .button-primary:hover { background: #e4f28e; }
    .button-secondary { border-color: rgba(255,255,255,.42); color: white; background: rgba(255,255,255,.06); }
    .button-secondary:hover { background: rgba(255,255,255,.14); }
    .hero-stamp {
      position: absolute; right: 4%; top: 25%; width: 126px; height: 126px; display: grid; place-items: center;
      border: 1px solid var(--lime); border-radius: 50%; color: var(--lime); text-align: center;
      font-size: 13px; font-weight: 800; line-height: 1.4; transform: rotate(10deg);
    }
    main section { padding: 76px 0; border-bottom: 1px solid var(--line); }
    main section:nth-of-type(even) { background: var(--white); }
    .section-head { max-width: 730px; margin-bottom: 32px; }
    .eyebrow { display: block; margin-bottom: 9px; color: var(--green); font-size: 12px; font-weight: 800; }
    h2 { margin: 0; font-size: 30px; line-height: 1.3; letter-spacing: 0; }
    .section-head p { margin: 12px 0 0; color: var(--muted); font-size: 15px; }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .metric { padding: 23px 24px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; color: var(--green); font-size: 21px; line-height: 1.35; }
    .metric span { display: block; margin-top: 6px; color: var(--muted); font-size: 13px; }
    .matrix { display: grid; grid-template-columns: repeat(12, 1fr); gap: 14px; }
    .topic {
      min-height: 155px; padding: 22px; border: 1px solid var(--line); border-radius: var(--radius);
      background: var(--white); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }
    .topic:hover { transform: translateY(-3px); border-color: #a9b9a5; box-shadow: var(--shadow); }
    .topic:nth-child(1), .topic:nth-child(4) { grid-column: span 5; }
    .topic:nth-child(2), .topic:nth-child(3) { grid-column: span 7; }
    .topic-label { color: var(--coral); font-size: 12px; font-weight: 800; }
    .topic h3 { margin: 8px 0 5px; font-size: 19px; }
    .topic p { margin: 0; color: var(--muted); font-size: 14px; }
    .comparison { border-top: 1px solid var(--line); }
    .compare-row { display: grid; grid-template-columns: 1.1fr 1fr 1fr; gap: 20px; padding: 17px 16px; border-bottom: 1px solid var(--line); }
    .compare-row:first-child { color: var(--green); font-weight: 800; background: var(--soft-green); }
    .compare-row span { font-size: 14px; }
    .compare-row span:first-child { font-weight: 700; }
    .timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
    .milestone { position: relative; padding: 22px 24px 0 0; border-top: 2px solid #cbd3c6; }
    .milestone::before { content: ""; position: absolute; top: -7px; left: 0; width: 12px; height: 12px; border-radius: 50%; background: var(--coral); }
    .milestone b { display: block; margin: 0 0 7px; font-size: 16px; }
    .milestone p { margin: 0; color: var(--muted); font-size: 14px; }
    .news-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .news-item { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
    .news-art { aspect-ratio: 16 / 9; display: grid; place-items: center; color: rgba(255,255,255,.92); font-size: 12px; font-weight: 800; letter-spacing: 0; }
    .art-one { background: linear-gradient(135deg, #315b46, #82915d); }
    .art-two { background: linear-gradient(135deg, #59483a, #c77b5e); }
    .art-three { background: linear-gradient(135deg, #303d38, #779285); }
    .art-four { background: linear-gradient(135deg, #7a5347, #d89a71); }
    .art-five { background: linear-gradient(135deg, #3c5147, #9aa271); }
    .art-six { background: linear-gradient(135deg, #4e5044, #b5a47b); }
    .news-body { padding: 15px 17px 17px; }
    .news-body time { color: var(--coral); font-size: 12px; font-weight: 700; }
    .news-body h3 { margin: 7px 0 0; font-size: 16px; line-height: 1.5; }
    .assurance { display: grid; grid-template-columns: 1fr 1fr; gap: 0 42px; }
    .assurance-item { display: grid; grid-template-columns: 34px 1fr; gap: 13px; padding: 18px 0; border-bottom: 1px solid var(--line); }
    .assurance-icon { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 50%; background: var(--soft-green); color: var(--green); font-weight: 800; }
    .assurance-item b { display: block; font-size: 15px; }
    .assurance-item p { margin: 4px 0 0; color: var(--muted); font-size: 14px; }
    .quick-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
    .quick-item { padding-left: 17px; border-left: 3px solid var(--coral); }
    .quick-item h3 { margin: 0 0 7px; font-size: 16px; }
    .quick-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { position: relative; padding: 18px 42px 18px 0; cursor: pointer; list-style: none; font-weight: 700; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; position: absolute; right: 7px; top: 14px; color: var(--green); font-size: 23px; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { max-width: 850px; margin: -4px 0 19px; color: var(--muted); font-size: 14px; }
    .contact-band { background: var(--green-dark) !important; color: white; }
    .contact-band .eyebrow { color: var(--lime); }
    .contact-band .section-head p { color: rgba(255,255,255,.72); }
    .contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 55px; align-items: start; }
    .contact-form { display: grid; gap: 15px; padding: 24px; border-radius: var(--radius); background: var(--white); color: var(--ink); }
    .field { display: grid; gap: 6px; }
    .field label { font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea {
      width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 4px;
      background: #fff; color: var(--ink);
    }
    .field textarea { min-height: 90px; resize: vertical; }
    .field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid #8ba17f; outline-offset: 1px; }
    .consent { display: flex; align-items: flex-start; gap: 9px; color: var(--muted); font-size: 12px; }
    .consent input { margin-top: 5px; accent-color: var(--green); }
    .form-status { min-height: 24px; margin: 0; color: var(--green); font-size: 13px; }
    .contact-note { align-self: center; }
    .contact-note h3 { max-width: 430px; margin: 0 0 14px; font-size: 25px; line-height: 1.4; }
    .contact-note p { max-width: 470px; color: rgba(255,255,255,.76); }
    .contact-note .button { margin-top: 8px; }
    footer { padding: 48px 0 18px; background: #191b18; color: rgba(255,255,255,.78); }
    .footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 34px; padding-bottom: 34px; }
    .footer-brand { color: white; }
    .footer-brand p { max-width: 290px; margin: 13px 0 0; color: rgba(255,255,255,.58); font-size: 13px; }
    .footer-col h3 { margin: 0 0 12px; color: white; font-size: 14px; }
    .footer-col a, .footer-col p { display: block; margin: 7px 0; color: rgba(255,255,255,.62); font-size: 13px; }
    .footer-col a:hover { color: var(--lime); }
    .copyright { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.14); color: rgba(255,255,255,.48); font-size: 12px; }
    @media (max-width: 1024px) {
      .container { width: min(var(--container), calc(100% - 40px)); }
      .nav-links { gap: 16px; }
      .hero-stamp { right: 2%; width: 105px; height: 105px; }
      .news-list { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-wrap { min-height: 68px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-links {
        position: absolute; top: 100%; left: 0; right: 0; display: none; padding: 12px 22px 18px;
        background: var(--white); border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
      }
      .nav-links.is-open { display: grid; gap: 0; }
      .nav-links a { display: block; padding: 11px 0; }
      .nav-age { display: none; }
      .hero { min-height: 490px; }
      .hero::after { right: -14%; width: 58%; opacity: .65; }
      .hero-stamp { display: none; }
      main section { padding: 58px 0; }
      .metrics { grid-template-columns: repeat(2, 1fr); }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      .timeline { grid-template-columns: repeat(2, 1fr); gap: 24px 0; }
      .assurance { gap: 0 22px; }
      .quick-grid { grid-template-columns: 1fr; gap: 19px; }
      .contact-layout { grid-template-columns: 1fr; gap: 28px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .container { width: calc(100% - 32px); }
      .brand-name { max-width: 220px; font-size: 13px; }
      .brand-mark { width: 38px; height: 38px; flex-basis: 38px; }
      .hero { min-height: 515px; }
      .hero-inner { padding-block: 54px 62px; }
      h1 { font-size: 39px; }
      .hero-copy { font-size: 14px; }
      .hero-actions { display: grid; grid-template-columns: 1fr; max-width: 260px; }
      h2 { font-size: 25px; }
      .matrix { grid-template-columns: 1fr; }
      .topic:nth-child(n) { grid-column: auto; }
      .compare-row { grid-template-columns: 1fr 1fr; gap: 8px 12px; padding: 14px 10px; }
      .compare-row span:first-child { grid-column: 1 / -1; }
      .compare-row:first-child span:first-child { grid-column: auto; }
      .timeline { grid-template-columns: 1fr; gap: 20px; }
      .news-list { grid-template-columns: 1fr; }
      .assurance { grid-template-columns: 1fr; }
      .contact-form { padding: 18px; }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px 18px; }
      .footer-brand { grid-column: 1 / -1; }
      .copyright { display: block; }
      .copyright span { display: block; margin-top: 5px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
    }