:root {
  --green-900: #0f3d2e;
  --green-700: #1b6b4c;
  --green-500: #2e9e6b;
  --green-300: #7fd1a8;
  --green-50: #eef7f1;
  --blue-600: #1f6feb;
  --ink: #1c2b25;
  --muted: #5b6b63;
  --bg: #ffffff;
  --tint: #f4faf6;
  --border: #e3ece7;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(15, 61, 46, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 61, 46, 0.14);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: min(1140px, 92%);
  margin: 0 auto;
}

/* 导航 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s;
}
.navbar.scrolled { box-shadow: var(--shadow); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-mark {
  display: grid; place-items: center;
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  color: #fff; font-weight: 800; border-radius: 10px;
  letter-spacing: 1px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 16px; }
.brand-text small { font-size: 11px; color: var(--muted); letter-spacing: .5px; }

.nav-links { display: flex; gap: 28px; }
.nav-links a {
  text-decoration: none; color: var(--ink); font-size: 15px; font-weight: 500;
  position: relative; padding: 4px 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--green-500); transition: width .25s;
}
.nav-links a:hover::after { width: 100%; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 6px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: .3s; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 84px 0 96px; }
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(46,158,107,.18), transparent 60%),
    radial-gradient(700px 400px at 0% 110%, rgba(31,111,235,.12), transparent 60%),
    linear-gradient(180deg, #f6fbf8, #ffffff);
}
.hero-inner {
  position: relative; display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center;
}
.badge {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: var(--green-50); color: var(--green-700); font-weight: 600; font-size: 14px;
  border: 1px solid var(--green-300);
}
.hero h1 {
  font-size: clamp(32px, 5vw, 52px); line-height: 1.2; margin: 18px 0 16px; color: var(--green-900);
}
.lead { font-size: 18px; color: var(--muted); max-width: 540px; }
.hero-actions { display: flex; gap: 14px; margin: 28px 0 32px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 36px; list-style: none; flex-wrap: wrap; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats b { font-size: 28px; color: var(--green-700); }
.hero-stats span { font-size: 13px; color: var(--muted); }

.btn {
  display: inline-block; padding: 12px 24px; border-radius: 10px; font-weight: 600; font-size: 15px;
  text-decoration: none; cursor: pointer; border: 1px solid transparent; transition: transform .15s, box-shadow .2s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: linear-gradient(135deg, var(--green-500), var(--green-700)); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { box-shadow: var(--shadow-lg); }
.btn-ghost { background: #fff; color: var(--green-700); border-color: var(--green-300); }
.btn-ghost:hover { background: var(--green-50); }
.btn-block { width: 100%; }

.hero-art { display: grid; place-items: center; }
.art-card {
  width: 100%; max-width: 360px; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 22px;
}
.art-row { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px dashed var(--border); }
.art-row span { color: var(--muted); font-size: 14px; }
.art-row b { color: var(--green-700); font-size: 18px; }
.art-chart { display: flex; align-items: flex-end; gap: 8px; height: 110px; margin-top: 16px; }
.art-chart span { flex: 1; background: linear-gradient(180deg, var(--green-300), var(--green-500)); border-radius: 6px 6px 0 0; }

/* 区块通用 */
.section { padding: 84px 0; }
.section-tint { background: var(--tint); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.eyebrow {
  display: inline-block; color: var(--green-500); font-weight: 700; letter-spacing: 2px; font-size: 13px; margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(24px, 3.4vw, 36px); color: var(--green-900); }
.section-sub { color: var(--muted); margin-top: 12px; font-size: 16px; }

/* 关于我们 */
.about-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 48px; align-items: start; }
.about-text p { margin-bottom: 16px; color: var(--muted); font-size: 16px; }
.about-text strong { color: var(--green-700); }
.check-list { list-style: none; margin-top: 8px; }
.check-list li { position: relative; padding-left: 28px; margin-bottom: 10px; color: var(--ink); }
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0; color: #fff; background: var(--green-500);
  width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; font-weight: 700;
}
.about-cards { display: grid; gap: 16px; }
.mini-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.mini-card h3 { color: var(--green-700); margin-bottom: 8px; font-size: 18px; }
.mini-card p { color: var(--muted); font-size: 14px; }

/* 流程 */
.flow { display: flex; align-items: stretch; justify-content: center; gap: 8px; flex-wrap: wrap; }
.flow-step {
  flex: 1 1 200px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 20px; box-shadow: var(--shadow); position: relative;
}
.flow-num { font-size: 28px; font-weight: 800; color: var(--green-300); }
.flow-step h4 { color: var(--green-900); margin: 8px 0 6px; font-size: 18px; }
.flow-step p { color: var(--muted); font-size: 14px; }
.flow-arrow { display: grid; place-items: center; color: var(--green-500); font-size: 24px; font-weight: 700; }

/* 卡片网格 */
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px;
  box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.feature-icon { font-size: 34px; margin-bottom: 12px; }
.feature-card h3 { color: var(--green-900); margin-bottom: 8px; font-size: 19px; }
.feature-card p { color: var(--muted); font-size: 15px; }

/* 优势 */
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.adv-item {
  background: #fff; border: 1px solid var(--border); border-left: 4px solid var(--green-500);
  border-radius: 12px; padding: 22px; box-shadow: var(--shadow);
}
.adv-item h4 { color: var(--green-700); margin-bottom: 8px; font-size: 18px; }
.adv-item p { color: var(--muted); font-size: 14px; }

/* 数据 */
.stats { background: linear-gradient(135deg, var(--green-900), var(--green-700)); color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat b { display: block; font-size: clamp(28px, 4vw, 44px); font-weight: 800; }
.stat span { font-size: 14px; opacity: .85; }

/* 联系 */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info { display: grid; gap: 16px; align-content: start; }
.info-item { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; box-shadow: var(--shadow); }
.info-item span { display: block; font-size: 13px; color: var(--green-500); font-weight: 600; margin-bottom: 4px; }
.info-item p { color: var(--ink); font-size: 16px; }
.contact-form { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; color: var(--ink); margin-bottom: 6px; font-weight: 500; }
.field input, .field textarea {
  width: 100%; padding: 11px 13px; border: 1px solid var(--border); border-radius: 10px; font-size: 15px;
  font-family: inherit; color: var(--ink); transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--green-500); box-shadow: 0 0 0 3px rgba(46,158,107,.15);
}
.form-tip { margin-top: 12px; color: var(--green-700); font-weight: 600; font-size: 14px; }

/* 页脚 */
.footer { background: var(--green-900); color: #cfe6da; padding: 48px 0 32px; }
.footer-inner { display: grid; gap: 20px; text-align: center; }
.footer-brand { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.footer-brand p { font-size: 14px; }
.footer-links { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.footer-links a { color: #cfe6da; text-decoration: none; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.copyright { font-size: 13px; opacity: .7; border-top: 1px solid rgba(255,255,255,.12); padding-top: 18px; }

/* 响应式 */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .about-grid { grid-template-columns: 1fr; }
  .cards-grid, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links {
    position: fixed; inset: 68px 0 auto 0; flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--border); padding: 8px 0;
    transform: translateY(-120%); transition: transform .3s; box-shadow: var(--shadow);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 12px 24px; }
  .nav-toggle { display: flex; }
  .flow-arrow { transform: rotate(90deg); }
}
@media (max-width: 560px) {
  .cards-grid, .adv-grid, .stats-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 22px; }
}