:root {
  --green: #1a9e4b;
  --green-dark: #137a39;
  --green-light: #e8f6ee;
  --ink: #1f2a24;
  --gray: #5a6660;
  --bg: #f6faf7;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
}

.container {
  width: min(1140px, 90%);
  margin: 0 auto;
}

/* 头部 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  box-shadow: 0 2px 12px rgba(0, 0, 0, .06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand { display: flex; align-items: center; gap: 14px; }

.brand-logo {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--green), var(--green-dark));
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 1px;
}

.brand-text h1 { font-size: 20px; color: var(--green-dark); }
.brand-text p { font-size: 13px; color: var(--gray); }

.nav { display: flex; gap: 28px; }
.nav a {
  text-decoration: none;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  transition: color .2s;
}
.nav a:hover { color: var(--green); }

/* 主页大图 */
.hero { position: relative; }
.hero-img {
  width: 100%;
  height: min(580px, 62vh);
  object-fit: cover;
  object-position: center right;
  display: block;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    rgba(6, 28, 16, .78) 0%,
    rgba(6, 28, 16, .55) 38%,
    rgba(6, 28, 16, .18) 68%,
    transparent 100%
  );
  display: flex;
  align-items: center;
}
.hero-copy {
  max-width: 560px;
  padding: 8px 0 12px;
}
.hero-title {
  color: #fff;
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: .06em;
  text-shadow: 0 2px 18px rgba(0, 0, 0, .5);
}
.hero-title span {
  display: block;
}
.hero-subtitle {
  color: rgba(236, 255, 242, .92);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.8;
  letter-spacing: .08em;
  margin-top: 20px;
  text-shadow: 0 1px 10px rgba(0, 0, 0, .45);
}
.hero-tags {
  display: flex;
  gap: 12px;
  margin-top: 30px;
  flex-wrap: wrap;
}
.hero-tags span {
  background: rgba(255, 255, 255, .95);
  color: var(--green-dark);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .12em;
  box-shadow: 0 4px 16px rgba(0, 0, 0, .14);
}

/* 数据 */
.stats { background: var(--green); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 36px 0;
}
.stat-item { text-align: center; color: #fff; }
.stat-num {
  font-size: clamp(28px, 3.2vw, 36px);
  font-weight: 800;
  letter-spacing: .04em;
  line-height: 1.2;
}
.stat-num span { font-size: .48em; margin-left: 2px; font-weight: 700; }
.stat-label {
  font-size: 14px;
  opacity: .9;
  margin-top: 8px;
  letter-spacing: .06em;
}

/* 通用标题 */
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 30px; color: var(--green-dark); }
.section-line {
  width: 60px;
  height: 4px;
  background: var(--green);
  border-radius: 4px;
  margin: 14px auto 0;
}

/* 公司介绍 */
.about { padding: 72px 0; }
.about-content {
  max-width: 900px;
  margin: 0 auto;
  background: #fff;
  padding: 44px 48px;
  border-radius: 16px;
  box-shadow: 0 6px 30px rgba(26, 158, 75, .08);
  border-left: 5px solid var(--green);
}
.about-content p { margin-bottom: 20px; font-size: 16px; color: #333; }
.about-content p:last-child { margin-bottom: 0; }
.about-content strong { color: var(--green-dark); }

/* 合作公司 */
.partners { padding: 72px 0; background: var(--green-light); }
.partners-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.partner-card {
  background: #fff;
  border-radius: 12px;
  padding: 30px 18px;
  text-align: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  box-shadow: 0 3px 14px rgba(0, 0, 0, .05);
  transition: transform .2s, box-shadow .2s;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 96px;
}
.partner-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 26px rgba(26, 158, 75, .18);
  color: var(--green-dark);
}

/* 页脚 */
.site-footer { background: #14261b; color: #cfe3d6; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  padding: 44px 0;
  flex-wrap: wrap;
}
.footer-brand h3 { color: #fff; font-size: 19px; margin-bottom: 10px; }
.footer-info p { font-size: 14px; margin-bottom: 6px; }
.footer-copy {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding: 18px 0;
  text-align: center;
  font-size: 13px;
  color: #9db3a6;
}

/* 响应式 */
@media (max-width: 768px) {
  .nav { gap: 16px; }
  .hero-img { height: min(480px, 68vh); }
  .hero-overlay {
    background: linear-gradient(
      180deg,
      rgba(6, 28, 16, .35) 0%,
      rgba(6, 28, 16, .72) 55%,
      rgba(6, 28, 16, .82) 100%
    );
    align-items: flex-end;
  }
  .hero-copy { max-width: none; padding-bottom: 28px; }
  .hero-title { font-size: 24px; letter-spacing: .04em; }
  .hero-subtitle { margin-top: 14px; font-size: 13px; letter-spacing: .04em; }
  .hero-tags { margin-top: 18px; gap: 8px; }
  .hero-tags span { padding: 8px 14px; font-size: 12px; letter-spacing: .06em; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 22px; padding: 28px 0; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .about-content { padding: 30px 22px; }
  .brand-text h1 { font-size: 17px; }
}