:root {
  color-scheme: light;
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  color: #20322d;
  background: #f4f8f6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(104, 198, 164, 0.18), transparent 32%),
    radial-gradient(circle at 88% 16%, rgba(111, 128, 226, 0.14), transparent 28%),
    #f4f8f6;
}

a {
  color: #126b50;
}

.seo-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px max(24px, calc((100vw - 1120px) / 2));
  background: rgba(250, 252, 251, 0.92);
  border-bottom: 1px solid rgba(30, 95, 75, 0.12);
  backdrop-filter: blur(16px);
}

.seo-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #173c31;
  font-size: 23px;
  font-weight: 800;
  text-decoration: none;
}

.seo-brand-mark {
  width: 30px;
  height: 30px;
  background: conic-gradient(from 45deg, #1a8a66, #7bc6ad, #697be0, #1a8a66);
  border: 6px solid #fff;
  border-radius: 50%;
  box-shadow: 0 3px 12px rgba(21, 96, 74, 0.22);
}

.seo-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.seo-nav a {
  color: #4f625c;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.seo-nav a:hover,
.seo-nav a[aria-current="page"] {
  color: #137152;
}

.seo-main {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.seo-hero {
  padding: clamp(68px, 10vw, 124px) 0 54px;
  text-align: center;
}

.seo-eyebrow {
  display: inline-block;
  padding: 7px 14px;
  color: #176b51;
  font-size: 14px;
  font-weight: 750;
  background: #ddf3ea;
  border-radius: 999px;
}

.seo-hero h1 {
  max-width: 900px;
  margin: 24px auto 20px;
  color: #153a2f;
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.seo-lead {
  max-width: 820px;
  margin: 0 auto;
  color: #52645e;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.85;
}

.seo-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.seo-btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  color: #fff;
  font-weight: 750;
  text-decoration: none;
  background: #167657;
  border-radius: 14px;
  box-shadow: 0 12px 28px rgba(22, 118, 87, 0.2);
}

.seo-btn.secondary {
  color: #17684f;
  background: #fff;
  border: 1px solid rgba(23, 104, 79, 0.2);
  box-shadow: none;
}

.seo-section {
  padding: 34px 0 42px;
}

.seo-section h2 {
  margin: 0 0 14px;
  color: #193e33;
  font-size: clamp(28px, 3.5vw, 42px);
  line-height: 1.3;
}

.seo-section > p,
.seo-section li,
.seo-card p,
.seo-card li {
  color: #53635e;
  font-size: 17px;
  line-height: 1.85;
}

.seo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.seo-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.seo-card {
  padding: 26px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(32, 101, 80, 0.12);
  border-radius: 22px;
  box-shadow: 0 14px 38px rgba(42, 82, 70, 0.07);
}

.seo-card h3 {
  margin: 0 0 10px;
  color: #1d4539;
  font-size: 22px;
}

.seo-card p:last-child,
.seo-card ul:last-child {
  margin-bottom: 0;
}

.seo-answer {
  padding: 28px 30px;
  background: linear-gradient(135deg, #173f33, #216c55);
  border-radius: 24px;
}

.seo-answer h2,
.seo-answer p {
  color: #fff;
}

.seo-answer p {
  margin-bottom: 0;
  font-size: 18px;
  line-height: 1.85;
  opacity: 0.92;
}

.seo-steps {
  counter-reset: steps;
}

.seo-steps .seo-card {
  position: relative;
  padding-top: 64px;
}

.seo-steps .seo-card::before {
  position: absolute;
  top: 22px;
  left: 26px;
  counter-increment: steps;
  content: counter(steps, decimal-leading-zero);
  color: #1a7a5c;
  font-size: 19px;
  font-weight: 850;
}

.seo-cta {
  margin: 48px 0 80px;
  padding: clamp(34px, 6vw, 64px);
  text-align: center;
  background: linear-gradient(140deg, #e0f4ec, #e8ebfb);
  border: 1px solid rgba(49, 105, 88, 0.12);
  border-radius: 30px;
}

.seo-cta h2 {
  margin-top: 0;
  font-size: clamp(28px, 4vw, 44px);
}

.seo-footer {
  padding: 30px 18px 42px;
  color: #6a7773;
  text-align: center;
  border-top: 1px solid rgba(32, 101, 80, 0.12);
}

.seo-footer a {
  margin: 0 8px;
}

@media (max-width: 760px) {
  .seo-topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .seo-grid,
  .seo-grid.two {
    grid-template-columns: 1fr;
  }

  .seo-hero {
    text-align: left;
  }

  .seo-lead {
    margin-left: 0;
  }

  .seo-actions {
    justify-content: flex-start;
  }
}