/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "微软雅黑", "Source Han Sans CN", "Noto Sans CJK SC",
               "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: #202223;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
a { color: #004C3F; text-decoration: none; transition: color .15s ease; }
a:hover { color: #008060; }

/* ===== 主题变量 ===== */
:root {
  --brand: #008060;
  --brand-dark: #004C3F;
  --brand-deep: #002E25;
  --bg-soft: #F1F1ED;
  --bg-cream: #FAF7F2;
  --bg-mint: #E3F1DF;
  --line: #E1E3E5;
  --text: #202223;
  --text-sub: #6D7175;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,.06);
  --container: 1200px;
}

/* ===== 容器 ===== */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 20px; color: var(--brand-deep); }
.logo svg { width: 28px; height: 28px; }
.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--text); font-size: 15px; font-weight: 500; }
.nav-links a:hover { color: var(--brand); }
.nav-links a.active { color: var(--brand); }
.nav-cta {
  background: var(--brand-deep);
  color: #fff !important;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  transition: background .15s ease, transform .15s ease;
}
.nav-cta:hover { background: var(--brand); color: #fff !important; }

/* 移动端菜单 */
.menu-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  width: 40px; height: 40px;
  padding: 0;
}
.menu-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  margin: 5px auto;
  transition: .3s;
}

/* ===== 通用按钮 ===== */
.btn {
  display: inline-block;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  text-align: center;
  cursor: pointer;
  transition: all .18s ease;
  border: none;
}
.btn-primary { background: var(--brand-deep); color: #fff; }
.btn-primary:hover { background: var(--brand); color: #fff; transform: translateY(-1px); }
.btn-secondary { background: transparent; color: var(--brand-deep); border: 1.5px solid var(--brand-deep); }
.btn-secondary:hover { background: var(--brand-deep); color: #fff; }
.btn-lg { padding: 16px 36px; font-size: 16px; }

/* ===== 首屏 Hero ===== */
.hero {
  background: linear-gradient(135deg, #E3F1DF 0%, #F1F1ED 60%, #FAF7F2 100%);
  padding: 96px 0 80px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; right: -120px; top: -120px;
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(0,128,96,.12), transparent 70%);
  border-radius: 50%;
}
.hero-inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; position: relative; }
.hero h1 {
  font-size: 56px;
  line-height: 1.15;
  font-weight: 800;
  margin: 0 0 20px;
  color: var(--brand-deep);
  letter-spacing: -.5px;
}
.hero h1 .accent { color: var(--brand); }
.hero p.lead { font-size: 19px; color: #3D3D3D; margin: 0 0 32px; max-width: 540px; }
.hero-buttons { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-meta { margin-top: 24px; font-size: 14px; color: var(--text-sub); }
.hero-meta strong { color: var(--brand-deep); }

.hero-visual {
  background: #fff;
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0,46,37,.12), 0 4px 12px rgba(0,0,0,.04);
  position: relative;
}
.hero-visual .mock-bar {
  display: flex; align-items: center; gap: 8px;
  padding-bottom: 16px; border-bottom: 1px solid var(--line); margin-bottom: 20px;
}
.hero-visual .dot { width: 10px; height: 10px; border-radius: 50%; background: #E1E3E5; }
.hero-visual .dot:nth-child(1) { background: #FF6B6B; }
.hero-visual .dot:nth-child(2) { background: #FFD93D; }
.hero-visual .dot:nth-child(3) { background: #6BCB77; }
.hero-visual h4 { margin: 0 0 4px; font-size: 14px; color: var(--text-sub); font-weight: 500; }
.hero-visual .stat { font-size: 36px; font-weight: 800; color: var(--brand-deep); margin: 0 0 12px; }
.hero-visual .bars { display: flex; align-items: flex-end; gap: 10px; height: 120px; margin-top: 16px; }
.hero-visual .bars div {
  flex: 1;
  background: linear-gradient(180deg, var(--brand) 0%, var(--brand-dark) 100%);
  border-radius: 4px 4px 0 0;
}
.hero-visual .bars div:nth-child(1) { height: 40%; opacity: .4; }
.hero-visual .bars div:nth-child(2) { height: 55%; opacity: .55; }
.hero-visual .bars div:nth-child(3) { height: 48%; opacity: .65; }
.hero-visual .bars div:nth-child(4) { height: 72%; opacity: .78; }
.hero-visual .bars div:nth-child(5) { height: 88%; opacity: .9; }
.hero-visual .bars div:nth-child(6) { height: 100%; }

/* ===== 区段通用 ===== */
section { padding: 80px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .eyebrow { font-size: 14px; color: var(--brand); font-weight: 600; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 12px; }
.section-head h2 { font-size: 40px; font-weight: 800; color: var(--brand-deep); margin: 0 0 16px; letter-spacing: -.3px; line-height: 1.2; }
.section-head p { font-size: 17px; color: var(--text-sub); margin: 0; }

/* ===== 数据带 ===== */
.stats-band { background: var(--brand-deep); color: #fff; padding: 56px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.stat-item { text-align: center; }
.stat-item .num { font-size: 42px; font-weight: 800; color: #fff; line-height: 1; }
.stat-item .label { font-size: 14px; color: #B5C2BD; margin-top: 8px; }

/* ===== 功能卡片 ===== */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 32px;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--brand); }
.feature-icon {
  width: 48px; height: 48px;
  background: var(--bg-mint);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  color: var(--brand-deep);
}
.feature-card h3 { font-size: 19px; font-weight: 700; color: var(--brand-deep); margin: 0 0 10px; }
.feature-card p { color: var(--text-sub); margin: 0; font-size: 15px; line-height: 1.65; }

/* ===== 套餐卡片 ===== */
.plans-wrap { background: var(--bg-cream); }
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; }
.plan {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 36px 32px;
  display: flex; flex-direction: column;
  position: relative;
}
.plan.featured { border: 2px solid var(--brand); box-shadow: 0 12px 32px rgba(0,128,96,.12); }
.plan .tag {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--brand); color: #fff;
  padding: 4px 14px; font-size: 12px; font-weight: 600;
  border-radius: 20px;
}
.plan h3 { font-size: 22px; font-weight: 700; color: var(--brand-deep); margin: 0 0 6px; }
.plan .desc { color: var(--text-sub); font-size: 14px; margin: 0 0 24px; min-height: 42px; }
.plan .price { display: baseline; margin-bottom: 8px; }
.plan .price .amt { font-size: 44px; font-weight: 800; color: var(--brand-deep); }
.plan .price .unit { font-size: 16px; color: var(--text-sub); margin-left: 6px; }
.plan .price-note { font-size: 13px; color: var(--text-sub); margin-bottom: 28px; }
.plan ul { list-style: none; padding: 0; margin: 0 0 28px; }
.plan li { padding: 8px 0 8px 26px; position: relative; font-size: 14px; color: #3D3D3D; }
.plan li::before {
  content: ''; position: absolute; left: 0; top: 14px;
  width: 14px; height: 8px;
  border-left: 2px solid var(--brand);
  border-bottom: 2px solid var(--brand);
  transform: rotate(-45deg);
}
.plan .btn { margin-top: auto; }

/* ===== 价格表 ===== */
.compare-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-sm); }
.compare-table th, .compare-table td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14px; }
.compare-table th { background: var(--bg-soft); font-weight: 600; color: var(--brand-deep); }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table td.num { font-weight: 600; color: var(--brand-deep); }

/* ===== FAQ ===== */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 14px;
  overflow: hidden;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 24px;
  font-size: 17px;
  font-weight: 600;
  color: var(--brand-deep);
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 22px; font-weight: 400;
  color: var(--brand);
  transition: transform .2s ease;
  flex-shrink: 0;
}
.faq-item[open] summary::after { content: '−'; }
.faq-item .answer { padding: 0 24px 24px; color: #3D3D3D; font-size: 15px; line-height: 1.75; }
.faq-item .answer p { margin: 0 0 12px; }
.faq-item .answer p:last-child { margin-bottom: 0; }
.faq-item .answer ul { padding-left: 22px; margin: 8px 0; }
.faq-item .answer li { padding: 4px 0; }

/* ===== 内容副栏 ===== */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.split + .split { margin-top: 96px; }
.split-text h3 { font-size: 30px; font-weight: 800; color: var(--brand-deep); margin: 0 0 16px; letter-spacing: -.2px; }
.split-text p { font-size: 16px; color: #3D3D3D; margin: 0 0 14px; }
.split-text ul { padding-left: 0; list-style: none; margin: 16px 0 0; }
.split-text li { padding: 6px 0 6px 28px; position: relative; }
.split-text li::before {
  content: '';
  position: absolute; left: 0; top: 14px;
  width: 14px; height: 8px;
  border-left: 2px solid var(--brand);
  border-bottom: 2px solid var(--brand);
  transform: rotate(-45deg);
}
.split-visual {
  background: linear-gradient(135deg, var(--bg-mint), var(--bg-cream));
  border-radius: 16px;
  padding: 40px;
  min-height: 320px;
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
}
.split-visual .mock {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,46,37,.1);
  padding: 20px;
  width: 100%;
  max-width: 360px;
}

/* ===== 内页 Hero ===== */
.page-hero {
  background: linear-gradient(135deg, #E3F1DF 0%, #F1F1ED 100%);
  padding: 72px 0 56px;
  text-align: center;
}
.page-hero h1 { font-size: 46px; font-weight: 800; color: var(--brand-deep); margin: 0 0 16px; letter-spacing: -.4px; }
.page-hero p { font-size: 18px; color: #3D3D3D; max-width: 680px; margin: 0 auto; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--brand-deep);
  color: #C9D3CF;
  padding: 64px 0 32px;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 56px; margin-bottom: 48px; }
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand p { font-size: 14px; line-height: 1.75; color: #B5C2BD; margin: 0; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 600; margin: 0 0 18px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { padding: 5px 0; font-size: 14px; color: #B5C2BD; }
.footer-col .contact-item { display: flex; align-items: center; gap: 10px; padding: 5px 0; font-size: 14px; color: #B5C2BD; }
.footer-col .contact-item a { color: #B5C2BD; }
.footer-col .contact-item a:hover { color: #fff; }
.social { display: flex; gap: 10px; margin-top: 14px; }
.social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  transition: background .15s ease;
}
.social a:hover { background: var(--brand); color: #fff; }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: 13px;
  color: #8FA39C;
  text-align: center;
}
.footer-bottom .disclaimer { margin-top: 8px; font-size: 12px; opacity: .75; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .hero { padding: 64px 0 56px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 40px; }
  .hero p.lead { font-size: 17px; }
  .section-head h2 { font-size: 30px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .plans { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split + .split { margin-top: 56px; }
  .split-text h3 { font-size: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .page-hero h1 { font-size: 34px; }
  section { padding: 56px 0; }
}

@media (max-width: 640px) {
  .container { padding: 0 18px; }
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 12px 0;
    box-shadow: 0 8px 20px rgba(0,0,0,.06);
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 14px 24px; }
  .nav-links .nav-cta { margin: 8px 24px; text-align: center; }
  .menu-toggle { display: block; }

  .hero h1 { font-size: 30px; }
  .hero-buttons .btn { flex: 1; padding: 13px 16px; font-size: 14px; }
  .hero-visual { padding: 20px; }
  .hero-visual .stat { font-size: 28px; }

  .section-head h2 { font-size: 24px; }
  .section-head p { font-size: 15px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stat-item .num { font-size: 30px; }

  .feature-grid { grid-template-columns: 1fr; gap: 16px; }
  .feature-card { padding: 24px; }

  .plan { padding: 28px 24px; }
  .plan .price .amt { font-size: 36px; }

  .compare-wrap { overflow-x: auto; }
  .compare-table { min-width: 560px; }
  .compare-table th, .compare-table td { padding: 12px 14px; font-size: 13px; }

  .faq-item summary { font-size: 15px; padding: 18px 18px; }
  .faq-item .answer { padding: 0 18px 20px; font-size: 14px; }

  .page-hero h1 { font-size: 26px; }
  .page-hero p { font-size: 15px; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-brand { grid-column: auto; }
}