:root {
    --green-900: #0f2e1d;
    --green-700: #1b6b3a;
    --green-600: #2aa85a;
    --green-500: #36c46b;
    --green-300: #8fe6ad;
    --lime: #b6f25a;
    --ink: #0c1a12;
    --muted: #5b6b62;
    --bg: #ffffff;
    --bg-soft: #f4f9f4;
    --bg-soft2: #eef6ef;
    --card: #ffffff;
    --border: #e3ece5;
    --shadow: 0 10px 40px rgba(15, 46, 29, 0.08);
    --shadow-lg: 0 24px 70px rgba(15, 46, 29, 0.14);
    --radius: 22px;
    --radius-sm: 14px;
    --maxw: 1160px;
    --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font); color: var(--ink); background: var(--bg);
    line-height: 1.65; -webkit-font-smoothing: antialiased; overflow-x: hidden;
  }
  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }

  .wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

  /* ---------- NAV ---------- */
  nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,0.72);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid transparent; transition: border-color .3s, background .3s;
  }
  nav.scrolled { border-color: var(--border); }
  .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
  .brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; letter-spacing: -.01em; }
  .brand .dot {
    width: 30px; height: 30px; border-radius: 9px;
    background: linear-gradient(135deg, var(--green-500), var(--lime));
    display: grid; place-items: center; color: #06210f; font-size: 16px;
    box-shadow: 0 6px 16px rgba(54,196,107,.35);
  }
  .nav-links { display: flex; gap: 30px; align-items: center; }
  .nav-links a { font-size: 15px; color: var(--muted); font-weight: 500; transition: color .2s; }
  .nav-links a:hover { color: var(--green-700); }
  .nav-cta {
    background: var(--ink); color: #fff; padding: 10px 18px; border-radius: 999px;
    font-weight: 600; font-size: 14px; transition: transform .2s, box-shadow .2s;
  }
  .nav-cta:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(0,0,0,.18); }
  .menu-btn { display: none; }

  /* ---------- HERO ---------- */
  header.hero {
    position: relative; padding: 150px 0 90px;
    background:
      radial-gradient(900px 500px at 85% -10%, rgba(54,196,107,.18), transparent 60%),
      radial-gradient(700px 500px at 5% 10%, rgba(182,242,90,.16), transparent 55%),
      linear-gradient(180deg, #f7fbf7, #ffffff 70%);
    overflow: hidden;
  }
  .badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: #ffffff; border: 1px solid var(--border);
    padding: 8px 16px; border-radius: 999px; font-size: 13.5px; font-weight: 600;
    color: var(--green-700); box-shadow: var(--shadow);
  }
  .badge .pulse {
    width: 8px; height: 8px; border-radius: 50%; background: var(--green-500);
    box-shadow: 0 0 0 0 rgba(54,196,107,.6); animation: pulse 2s infinite;
  }
  @keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(54,196,107,.55); }
    70% { box-shadow: 0 0 0 10px rgba(54,196,107,0); }
    100% { box-shadow: 0 0 0 0 rgba(54,196,107,0); }
  }
  h1.title {
    font-size: clamp(38px, 6.2vw, 76px); line-height: 1.04; letter-spacing: -.03em;
    font-weight: 850; margin: 26px 0 0; max-width: 16ch;
  }
  h1.title .grad {
    background: linear-gradient(120deg, var(--green-700), var(--green-500) 55%, var(--lime));
    -webkit-background-clip: text; background-clip: text; color: transparent;
  }
  .subtitle { font-size: clamp(17px, 2.1vw, 21px); color: var(--muted); max-width: 60ch; margin-top: 22px; }
  .hero-cta { display: flex; gap: 14px; margin-top: 36px; flex-wrap: wrap; }
  .btn {
    display: inline-flex; align-items: center; gap: 9px; padding: 14px 26px;
    border-radius: 999px; font-weight: 650; font-size: 15.5px; cursor: pointer;
    border: 1px solid transparent; transition: transform .2s, box-shadow .2s, background .2s;
  }
  .btn-primary { background: var(--green-700); color: #fff; box-shadow: 0 14px 30px rgba(27,107,58,.32); }
  .btn-primary:hover { transform: translateY(-2px); background: var(--green-600); }
  .btn-ghost { background: #fff; border-color: var(--border); color: var(--ink); }
  .btn-ghost:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

  .hero-stats { display: flex; gap: 40px; margin-top: 56px; flex-wrap: wrap; }
  .hero-stats .num { font-size: 34px; font-weight: 850; letter-spacing: -.02em; color: var(--green-700); }
  .hero-stats .lbl { font-size: 14px; color: var(--muted); margin-top: 2px; }

  .hero-visual {
    position: absolute; right: -60px; top: 120px; width: 460px; height: 460px;
    border-radius: 50%; pointer-events: none; opacity: .9;
    background: conic-gradient(from 120deg, rgba(54,196,107,.35), rgba(182,242,90,.25), rgba(143,230,173,.35), rgba(54,196,107,.35));
    filter: blur(6px); animation: spin 26s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }
  .hero-ring {
    position: absolute; right: 40px; top: 150px; width: 360px; height: 360px;
    border-radius: 50%; border: 1.5px dashed rgba(27,107,58,.3); animation: spin 40s linear infinite reverse;
  }

  /* ---------- SECTION ---------- */
  section { padding: 96px 0; position: relative; }
  .sec-tag { font-size: 13px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--green-600); }
  .sec-title { font-size: clamp(28px, 4vw, 44px); font-weight: 820; letter-spacing: -.02em; margin-top: 12px; max-width: 18ch; }
  .sec-lead { color: var(--muted); font-size: 17px; margin-top: 16px; max-width: 60ch; }
  .center { text-align: center; }
  .center .sec-title, .center .sec-lead { margin-left: auto; margin-right: auto; }
  .bg-soft { background: var(--bg-soft); }

  /* intro split */
  .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
  .intro-text p { color: var(--muted); font-size: 16.5px; margin-top: 18px; }
  .intro-text .hl { color: var(--green-700); font-weight: 700; }
  .intro-card {
    background: linear-gradient(160deg, #ffffff, #f3faf4);
    border: 1px solid var(--border); border-radius: var(--radius); padding: 30px;
    box-shadow: var(--shadow);
  }
  .intro-card h4 { font-size: 16px; color: var(--green-700); margin-bottom: 18px; display:flex; align-items:center; gap:8px;}
  .kv { display: flex; justify-content: space-between; padding: 13px 0; border-bottom: 1px dashed var(--border); font-size: 15px; }
  .kv:last-child { border-bottom: 0; }
  .kv .k { color: var(--muted); }
  .kv .v { font-weight: 700; text-align: right; }

  /* features */
  .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 50px; }
  .card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 30px 28px; transition: transform .25s, box-shadow .25s, border-color .25s;
  }
  .card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--green-300); }
  .card .ico {
    width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
    background: linear-gradient(135deg, rgba(54,196,107,.16), rgba(182,242,90,.16));
    color: var(--green-700); font-size: 24px; margin-bottom: 18px;
  }
  .card h3 { font-size: 19px; font-weight: 750; letter-spacing: -.01em; }
  .card p { color: var(--muted); font-size: 15px; margin-top: 10px; }

  /* tech pipeline */
  .pipeline { display: flex; align-items: stretch; gap: 0; margin-top: 50px; flex-wrap: wrap; }
  .step {
    flex: 1; min-width: 170px; background: #fff; border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 24px 20px; position: relative;
  }
  .step:not(:last-child)::after {
    content: "→"; position: absolute; right: -16px; top: 50%; transform: translateY(-50%);
    color: var(--green-500); font-size: 22px; font-weight: 800; z-index: 2;
  }
  .step .n { font-size: 13px; font-weight: 800; color: var(--green-600); letter-spacing: .08em; }
  .step h4 { font-size: 17px; margin: 8px 0 6px; font-weight: 750; }
  .step p { font-size: 14px; color: var(--muted); }

  .metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 46px; }
  .metric { background:#fff; border:1px solid var(--border); border-radius: var(--radius-sm); padding: 22px; text-align:center; }
  .metric .big { font-size: 30px; font-weight: 850; color: var(--green-700); letter-spacing: -.02em; }
  .metric .cap { font-size: 13.5px; color: var(--muted); margin-top: 6px; }

  /* DEMO */
  .demo-wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: start; margin-top: 46px; }
  .demo-stage {
    background: #0f2e1d; border-radius: var(--radius); padding: 18px; position: relative;
    box-shadow: var(--shadow-lg); min-height: 420px; display: grid; place-items: center; overflow: hidden;
  }
  #demoCanvas { width: 100%; display: block; border-radius: 14px; }
  .placeholder { color: #cfe9d6; text-align: center; padding: 40px; }
  .placeholder .ic { font-size: 46px; opacity:.8; }
  .placeholder p { margin-top: 12px; font-size: 15px; }
  .demo-controls { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
  .demo-side .result-card {
    background:#fff; border:1px solid var(--border); border-radius: var(--radius); padding: 26px;
    box-shadow: var(--shadow); min-height: 420px;
  }
  .result-card h4 { font-size: 17px; color: var(--green-700); margin-bottom: 16px; display:flex; align-items:center; gap:8px;}
  .bar-row { margin: 14px 0; }
  .bar-row .top { display:flex; justify-content: space-between; font-size: 14px; margin-bottom: 6px; }
  .bar-row .top b { font-weight: 750; }
  .bar { height: 10px; background: var(--bg-soft2); border-radius: 999px; overflow: hidden; }
  .bar > span { display:block; height:100%; border-radius:999px; background: linear-gradient(90deg, var(--green-600), var(--lime)); width: 0; transition: width 1s ease; }
  .weed-bar > span { background: linear-gradient(90deg, #e8a33d, #f0c14b); }
  .demo-note { font-size: 13px; color: var(--muted); margin-top: 18px; line-height:1.6; }

  /* value */
  .value-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 50px; }
  .value-card { background:#fff; border:1px solid var(--border); border-radius: var(--radius); padding: 30px; display:flex; gap:18px; }
  .value-card .vico { font-size: 30px; flex-shrink:0; }
  .value-card h3 { font-size: 18px; font-weight: 750; }
  .value-card p { color: var(--muted); font-size: 15px; margin-top: 8px; }

  /* scenario */
  .scene-grid { display:grid; grid-template-columns: repeat(4,1fr); gap:18px; margin-top:46px; }
  .scene { background: linear-gradient(160deg,#fff,#f3faf4); border:1px solid var(--border); border-radius: var(--radius-sm); padding: 24px 20px; transition: transform .25s, box-shadow .25s; }
  .scene:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
  .scene .sic { font-size: 28px; }
  .scene h4 { font-size: 16px; margin-top: 10px; font-weight: 750; }
  .scene p { font-size: 13.5px; color: var(--muted); margin-top: 6px; }

  /* CTA */
  .cta-box {
    background: linear-gradient(135deg, var(--green-900), var(--green-700));
    border-radius: 28px; padding: 64px 48px; text-align: center; color: #fff; position: relative; overflow: hidden;
  }
  .cta-box::before { content:""; position:absolute; inset:0; background: radial-gradient(500px 300px at 80% 0%, rgba(182,242,90,.25), transparent 60%); }
  .cta-box h2 { font-size: clamp(26px,4vw,40px); font-weight: 820; position: relative; letter-spacing: -.02em; }
  .cta-box p { color: #cfe9d6; margin-top: 14px; font-size: 17px; position: relative; }
  .cta-box .btn-primary { background:#fff; color: var(--green-900); margin-top: 30px; position: relative; }
  .cta-box .btn-primary:hover { background: var(--lime); }

  /* footer */
  footer { padding: 50px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
  .foot-inner { display:flex; justify-content: space-between; align-items:center; flex-wrap: wrap; gap: 16px; }

  /* reveal */
  .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
  .reveal.in { opacity: 1; transform: none; }

  /* responsive */
  @media (max-width: 920px) {
    .split, .demo-wrap { grid-template-columns: 1fr; }
    .grid-3, .metrics, .scene-grid { grid-template-columns: repeat(2, 1fr); }
    .value-grid { grid-template-columns: 1fr; }
    .hero-visual, .hero-ring { display: none; }
    .nav-links { display: none; }
    .menu-btn { display: inline-block; }
  }
  @media (max-width: 560px) {
    .grid-3, .metrics, .scene-grid { grid-template-columns: 1fr; }
    .metrics { grid-template-columns: repeat(2,1fr); }
    .hero-stats { gap: 26px; }
    section { padding: 70px 0; }
    .cta-box { padding: 44px 26px; }
  }