:root{
    --green-900:#0C4A30;
    --green-700:#0E6B43;
    --green-600:#137A52;   /* 主色·信任绿 */
    --green-500:#1E9E66;   /* 农业绿 */
    --green-400:#34B97E;
    --green-50:#EAF5EF;
    --blue-900:#0E2438;    /* 深蓝·技术信任 */
    --blue-800:#13314C;
    --blue-600:#1C4A6E;
    --ink:#16241C;
    --ink-2:#46574E;
    --ink-3:#6E7E75;
    --line:#E2ECE6;
    --bg:#F5F9F6;
    --surface:#FFFFFF;
    --shadow:0 6px 22px rgba(14,74,48,.07);
    --shadow-hover:0 12px 30px rgba(14,74,48,.13);
    --radius:16px;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"Microsoft YaHei","PingFang SC","Hiragino Sans GB",sans-serif;
    color:var(--ink);
    background:var(--bg);
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
  }
  a{color:inherit;text-decoration:none}
  .wrap{max-width:1180px;margin:0 auto;padding:0 24px}
  .section{padding:84px 0}
  .section--band{background:var(--surface)}
  .eyebrow{
    display:inline-block;font-size:13px;font-weight:700;letter-spacing:.08em;
    color:var(--green-600);background:var(--green-50);
    padding:6px 14px;border-radius:999px;margin-bottom:18px;
  }
  h2.title{font-size:32px;line-height:1.3;font-weight:800;letter-spacing:-.01em}
  .lead{color:var(--ink-2);font-size:16.5px;max-width:720px;margin-top:14px}
  .center-head{text-align:center}
  .center-head .lead{margin-left:auto;margin-right:auto}

  /* ===== Nav ===== */
  .nav{
    position:sticky;top:0;z-index:50;
    background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(10px);
    border-bottom:1px solid var(--line);
  }
  .nav__inner{display:flex;align-items:center;justify-content:space-between;height:64px}
  .brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.01em}
  .brand__mark{
    width:34px;height:34px;border-radius:9px;flex:none;
    background:linear-gradient(135deg,var(--green-600),var(--green-400));
    display:flex;align-items:center;justify-content:center;color:#fff;
  }
  .brand__mark svg{width:20px;height:20px}
  .brand small{display:block;font-size:11px;font-weight:600;color:var(--ink-3);letter-spacing:.04em}
  .nav__links{display:flex;gap:28px;font-size:14.5px;color:var(--ink-2);font-weight:600}
  .nav__links a:hover{color:var(--green-600)}
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    font-weight:700;font-size:15px;border-radius:10px;padding:11px 22px;cursor:pointer;
    border:1px solid transparent;transition:.2s ease;white-space:nowrap;
  }
  .btn--primary{background:var(--green-600);color:#fff}
  .btn--primary:hover{background:var(--green-700);box-shadow:var(--shadow-hover)}
  .btn--ghost{background:#fff;color:var(--green-700);border-color:var(--line)}
  .btn--ghost:hover{border-color:var(--green-400);color:var(--green-600)}
  .btn--light{background:#fff;color:var(--green-700)}
  .btn--light:hover{background:var(--green-50)}
  .nav .btn{padding:9px 18px;font-size:14px}

  /* ===== Hero ===== */
  .hero{position:relative;overflow:hidden;background:
      radial-gradient(900px 420px at 78% -10%,rgba(52,185,126,.16),transparent 60%),
      radial-gradient(700px 360px at 8% 110%,rgba(28,74,110,.10),transparent 60%),
      linear-gradient(180deg,#F1F8F3 0%,#F5F9F6 100%);
  }
  .hero__grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding:74px 0 86px}
  .hero h1{font-size:46px;line-height:1.18;font-weight:850;letter-spacing:-.02em;margin:16px 0 4px}
  .hero h1 .hl{color:var(--green-600)}
  .hero__sub{font-size:17.5px;color:var(--ink-2);margin-top:18px;max-width:560px}
  .hero__cta{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
  .hero__chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
  .chip{
    font-size:13.5px;font-weight:600;color:var(--green-700);
    background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 15px;
    display:inline-flex;align-items:center;gap:7px;
  }
  .chip::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--green-400)}

  /* hero visual card */
  .hero__card{
    background:var(--surface);border:1px solid var(--line);border-radius:20px;
    box-shadow:var(--shadow);padding:24px;
  }
  .hero__card h4{font-size:14px;color:var(--ink-3);font-weight:700;letter-spacing:.04em;margin-bottom:14px}
  .bline{display:flex;align-items:center;justify-content:space-between;padding:11px 0;border-top:1px dashed var(--line);font-size:14.5px}
  .bline:first-of-type{border-top:none}
  .bline__k{color:var(--ink-2);font-weight:600}
  .bline__v{font-weight:800;font-variant-numeric:tabular-nums}
  .bline__v.pos{color:var(--green-600)}
  .bline__v.neg{color:#C0492F}
  .hero__card .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--green-700);background:var(--green-50);padding:3px 9px;border-radius:6px;margin-top:14px}

  /* ===== Pain points ===== */
  .grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
  .pcard{
    background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px 20px;
    transition:.2s ease;
  }
  .pcard:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
  .pcard__no{font-size:13px;font-weight:800;color:var(--green-500)}
  .pcard h4{font-size:16.5px;font-weight:800;margin:10px 0 8px}
  .pcard p{font-size:14px;color:var(--ink-2)}

  /* ===== Value ===== */
  .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
  .vcard{
    background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
    padding:26px 22px;transition:.2s ease;position:relative;overflow:hidden;
  }
  .vcard::before{content:"";position:absolute;left:0;top:0;width:4px;height:100%;background:linear-gradient(180deg,var(--green-500),var(--green-400))}
  .vcard:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
  .vcard__ic{
    width:46px;height:46px;border-radius:12px;background:var(--green-50);color:var(--green-600);
    display:flex;align-items:center;justify-content:center;margin-bottom:16px;
  }
  .vcard__ic svg{width:24px;height:24px}
  .vcard h4{font-size:17.5px;font-weight:800;margin-bottom:8px}
  .vcard p{font-size:14.5px;color:var(--ink-2)}

  /* ===== Modules grid ===== */
  .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .mcard{
    background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;
    display:flex;gap:16px;transition:.2s ease;
  }
  .mcard:hover{box-shadow:var(--shadow);border-color:#cfe6da}
  .mcard__ic{
    width:48px;height:48px;flex:none;border-radius:12px;
    background:linear-gradient(135deg,var(--green-600),var(--green-400));color:#fff;
    display:flex;align-items:center;justify-content:center;
  }
  .mcard__ic svg{width:25px;height:25px}
  .mcard h4{font-size:16.5px;font-weight:800;margin-bottom:5px}
  .mcard p{font-size:13.5px;color:var(--ink-2)}

  /* ===== Model diagram ===== */
  .model{background:var(--green-50);border:1px solid var(--line);border-radius:20px;padding:38px 30px}
  .diagram{display:grid;grid-template-columns:1fr 1.2fr 1fr;gap:0;align-items:stretch;margin-top:10px}
  .branch{display:flex;flex-direction:column;justify-content:center;gap:12px;padding:18px}
  .branch__label{font-size:13px;font-weight:800;letter-spacing:.06em;color:var(--ink-3);text-align:center}
  .price-card{
    border-radius:14px;padding:18px 16px;text-align:center;color:#fff;box-shadow:var(--shadow);
  }
  .price-card small{display:block;font-size:12.5px;font-weight:600;opacity:.85;margin-top:4px}
  .price-card strong{font-size:21px;font-weight:850}
  .price-card.buy{background:linear-gradient(135deg,var(--green-700),var(--green-500))}
  .price-card.sell{background:linear-gradient(135deg,var(--blue-800),var(--blue-600))}
  .center-col{display:flex;align-items:center;justify-content:center;position:relative}
  .center-card{
    background:var(--surface);border:2px solid var(--green-400);border-radius:16px;
    padding:24px 22px;text-align:center;box-shadow:var(--shadow);min-width:200px;
  }
  .center-card .ic{
    width:50px;height:50px;border-radius:13px;margin:0 auto 12px;
    background:linear-gradient(135deg,var(--green-600),var(--green-400));color:#fff;
    display:flex;align-items:center;justify-content:center;
  }
  .center-card .ic svg{width:27px;height:27px}
  .center-card strong{font-size:19px;font-weight:850;display:block}
  .center-card small{font-size:13px;color:var(--ink-3);font-weight:600}
  .arrow{position:absolute;top:50%;transform:translateY(-50%);width:46px;height:2px;background:var(--green-400)}
  .arrow.l{left:-6px}.arrow.r{right:-6px}
  .arrow::after{content:"";position:absolute;top:-4px;width:10px;height:10px;border-top:2px solid var(--green-400);border-right:2px solid var(--green-400)}
  .arrow.l::after{left:0;transform:rotate(-135deg)}
  .arrow.r::after{right:0;transform:rotate(45deg)}
  .model__note{
    margin-top:26px;background:#fff;border:1px solid var(--line);border-left:4px solid var(--green-500);
    border-radius:10px;padding:16px 20px;font-size:14.5px;color:var(--ink-2);
  }
  .model__note b{color:var(--green-700)}

  /* ===== Reliable rules ===== */
  .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
  .rule{
    background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;
    transition:.2s ease;
  }
  .rule:hover{box-shadow:var(--shadow)}
  .rule__tag{font-size:12.5px;font-weight:800;color:var(--green-600);letter-spacing:.04em;margin-bottom:10px}
  .rule h4{font-size:17px;font-weight:800;margin-bottom:10px}
  .rule p{font-size:14.5px;color:var(--ink-2)}
  .formula{
    margin-top:14px;background:var(--green-50);border:1px solid #d4e9dd;border-radius:10px;
    padding:13px 16px;font-size:16px;font-weight:800;color:var(--green-900);
    font-variant-numeric:tabular-nums;letter-spacing:.01em;
  }
  .formula .mut{font-weight:600;font-size:13px;color:var(--ink-3);display:block;margin-top:6px}

  /* ===== Data value ===== */
  .grid-7{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
  .dcard{
    background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px 18px;
    transition:.2s ease;
  }
  .dcard:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#cfe6da}
  .dcard__ic{width:38px;height:38px;border-radius:10px;background:var(--blue-900);color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:13px}
  .dcard__ic svg{width:21px;height:21px}
  .dcard h4{font-size:15.5px;font-weight:800;margin-bottom:5px}
  .dcard p{font-size:13px;color:var(--ink-2)}
  .dcard--wide{grid-column:span 4;background:linear-gradient(135deg,var(--green-700),var(--green-500));color:#fff;border:none}
  .dcard--wide .dcard__ic{background:rgba(255,255,255,.18)}
  .dcard--wide p{color:rgba(255,255,255,.9)}

  /* ===== Tech band ===== */
  .tech{background:linear-gradient(160deg,var(--blue-900),var(--blue-800));color:#fff}
  .tech h2.title{color:#fff}
  .tech .eyebrow{background:rgba(255,255,255,.12);color:#9fe3c2}
  .tech .lead{color:rgba(255,255,255,.78)}
  .stack{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:36px}
  .stack__col{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:26px}
  .stack__col h4{font-size:15px;font-weight:800;color:#9fe3c2;letter-spacing:.04em;margin-bottom:16px;display:flex;align-items:center;gap:9px}
  .stack__col h4 svg{width:20px;height:20px}
  .stack__chips{display:flex;flex-wrap:wrap;gap:10px}
  .stack__chip{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:9px;padding:9px 15px;font-size:14px;font-weight:700}
  .tech__foot{margin-top:28px;display:flex;flex-wrap:wrap;gap:12px;color:rgba(255,255,255,.8);font-size:14px}
  .tech__foot span{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:999px;padding:8px 16px;font-weight:600}

  /* ===== CTA + footer ===== */
  .cta{text-align:center;padding:78px 0;background:
      radial-gradient(600px 300px at 50% 0%,rgba(52,185,126,.18),transparent 70%),var(--surface)}
  .cta h2{font-size:34px;font-weight:850;letter-spacing:-.01em}
  .cta p{color:var(--ink-2);font-size:16.5px;margin:14px auto 28px;max-width:560px}
  .cta__btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
  .footer{background:var(--green-900);color:rgba(255,255,255,.8);padding:34px 0;font-size:13.5px}
  .footer__inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px}
  .footer a{color:#9fe3c2;font-weight:600}
  .footer .brand{color:#fff}
  .footer .brand small{color:rgba(255,255,255,.6)}

  /* ===== Responsive ===== */
  @media (max-width:980px){
    .hero__grid{grid-template-columns:1fr;gap:36px}
    .grid-5{grid-template-columns:repeat(2,1fr)}
    .grid-4{grid-template-columns:repeat(2,1fr)}
    .grid-3{grid-template-columns:repeat(2,1fr)}
    .grid-7{grid-template-columns:repeat(2,1fr)}
    .dcard--wide{grid-column:span 2}
    .stack{grid-template-columns:1fr}
  }
  @media (max-width:768px){
    .section{padding:56px 0}
    .nav__links{display:none}
    .hero h1{font-size:34px}
    h2.title{font-size:26px}
    .diagram{grid-template-columns:1fr;gap:14px}
    .arrow{display:none}
    .center-col{order:-1}
    .grid-5,.grid-4,.grid-3,.grid-2,.grid-7{grid-template-columns:1fr}
    .dcard--wide{grid-column:span 1}
    .hero__card{order:2}
  }

/* ===== 导出网页版新增样式 ===== */
.brand__logo{width:34px;height:34px;border-radius:9px;display:block;flex:none}
.hero__art{width:100%;max-width:520px;margin-top:26px;border-radius:16px;box-shadow:var(--shadow);display:block}
.showcase{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:44px}
.showcase__item{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:.2s ease}
.showcase__item:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.showcase__img{width:100%;display:block}
.showcase__item figcaption{padding:14px 18px;font-size:14.5px;font-weight:700;color:var(--ink);border-top:1px solid var(--line)}
@media (max-width:768px){.showcase{grid-template-columns:1fr}.hero__art{display:none}}