:root {
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: #f6f3ec;
  color: #17201f;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 82% 8%, rgba(15, 118, 110, 0.12), transparent 28rem),
    radial-gradient(circle at 14% 16%, rgba(180, 128, 44, 0.1), transparent 25rem),
    linear-gradient(180deg, #faf8f4, #f6f3ec 46rem, #f9f7f2);
}

a {
  color: inherit;
  text-decoration: none;
}

.seo-site-header {
  position: relative;
  z-index: 10;
  display: flex;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 24px 0;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.seo-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.seo-brand img {
  border-radius: 50%;
  box-shadow: 0 10px 30px rgba(111, 75, 22, 0.14);
}

.seo-brand span {
  display: grid;
  gap: 2px;
}

.seo-brand strong {
  font-family: "Songti SC", SimSun, serif;
  font-size: 19px;
  letter-spacing: 0.16em;
}

.seo-brand small {
  color: #697573;
  font-size: 10px;
  letter-spacing: 0.08em;
}

.seo-main-nav,
.seo-site-footer nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
}

.seo-main-nav a,
.seo-site-footer nav a {
  color: #5f6b69;
  font-size: 13px;
  font-weight: 700;
  transition: color 160ms ease;
}

.seo-main-nav a:hover,
.seo-main-nav a[aria-current="page"],
.seo-site-footer nav a:hover {
  color: #0f766e;
}

main {
  display: block;
}

.seo-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(260px, 0.72fr);
  width: min(1180px, calc(100% - 40px));
  min-height: 610px;
  margin: 18px auto 0;
  padding: 80px 72px;
  align-items: center;
  gap: 70px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.88);
  border-radius: 42px;
  background: rgba(255, 255, 255, 0.58);
  box-shadow: 0 34px 100px rgba(66, 48, 24, 0.1);
  backdrop-filter: blur(24px);
}

.seo-hero::before {
  position: absolute;
  width: 480px;
  height: 480px;
  top: -230px;
  right: -120px;
  border: 1px solid rgba(15, 118, 110, 0.12);
  border-radius: 50%;
  content: "";
}

.seo-hero-copy,
.seo-principle-card {
  position: relative;
  z-index: 2;
}

.seo-eyebrow,
.seo-principle-card > span,
.seo-feature-card > span,
.seo-topic-panel > p,
.seo-closing > p {
  color: #0f766e;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.22em;
}

.seo-hero h1 {
  max-width: 760px;
  margin: 24px 0;
  font-family: "Songti SC", SimSun, serif;
  font-size: clamp(44px, 6vw, 78px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.035em;
}

.seo-lead {
  max-width: 700px;
  margin: 0;
  color: #596563;
  font-family: "Songti SC", SimSun, serif;
  font-size: 18px;
  line-height: 2;
}

.seo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.seo-button {
  display: inline-flex;
  min-height: 48px;
  padding: 0 22px;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  font-size: 14px;
  font-weight: 800;
}

.seo-button-primary {
  background: #153f3b;
  color: #fff;
  box-shadow: 0 16px 34px rgba(21, 63, 59, 0.2);
}

.seo-button-secondary {
  border: 1px solid rgba(21, 63, 59, 0.14);
  background: rgba(255, 255, 255, 0.56);
  color: #2e4b48;
}

.seo-principle-card {
  display: grid;
  padding: 36px;
  gap: 12px;
  border: 1px solid rgba(15, 118, 110, 0.14);
  border-radius: 32px;
  background:
    linear-gradient(145deg, rgba(10, 61, 57, 0.96), rgba(18, 45, 44, 0.94)),
    #153f3b;
  color: #f8f3e8;
  box-shadow: 0 28px 70px rgba(15, 52, 49, 0.2);
}

.seo-principle-card > span {
  margin-bottom: 16px;
  color: #7dd3c7;
  font-size: 9px;
}

.seo-principle-card strong {
  font-family: "Songti SC", SimSun, serif;
  font-size: 27px;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.seo-principle-card p {
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.58);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.seo-orbit {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.seo-orbit i {
  position: absolute;
  border: 1px solid rgba(168, 120, 44, 0.12);
  border-radius: 50%;
}

.seo-orbit i:nth-child(1) {
  width: 360px;
  height: 360px;
  left: -200px;
  bottom: -170px;
}

.seo-orbit i:nth-child(2) {
  width: 250px;
  height: 250px;
  left: -145px;
  bottom: -115px;
}

.seo-orbit i:nth-child(3) {
  width: 110px;
  height: 110px;
  right: 24%;
  top: 12%;
}

.seo-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: min(1100px, calc(100% - 40px));
  margin: -48px auto 0;
  gap: 14px;
  position: relative;
  z-index: 4;
}

.seo-feature-card {
  min-height: 220px;
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 24px 60px rgba(67, 52, 29, 0.08);
  backdrop-filter: blur(20px);
}

.seo-feature-card h2 {
  margin: 22px 0 12px;
  font-family: "Songti SC", SimSun, serif;
  font-size: 24px;
}

.seo-feature-card p {
  margin: 0;
  color: #66716f;
  font-size: 14px;
  line-height: 1.9;
}

.seo-reading-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  width: min(1100px, calc(100% - 40px));
  margin: 110px auto;
  align-items: start;
  gap: 72px;
}

.seo-content-section {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  padding: 0 0 64px;
  gap: 22px;
}

.seo-section-number {
  display: flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(15, 118, 110, 0.16);
  border-radius: 50%;
  color: #0f766e;
  font-size: 11px;
  font-weight: 800;
}

.seo-content-section h2,
.seo-topic-panel h2,
.seo-closing h2 {
  margin: 0 0 22px;
  font-family: "Songti SC", SimSun, serif;
  font-size: clamp(28px, 3.2vw, 42px);
  font-weight: 600;
  line-height: 1.35;
}

.seo-content-section p {
  margin: 0 0 18px;
  color: #52605d;
  font-family: "Songti SC", SimSun, serif;
  font-size: 17px;
  line-height: 2;
}

.seo-content-section ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 26px 0 0;
  padding: 0;
  gap: 10px;
  list-style: none;
}

.seo-content-section li {
  padding: 14px 16px;
  border: 1px solid rgba(15, 118, 110, 0.1);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.62);
  color: #38524f;
  font-size: 13px;
  font-weight: 700;
}

.seo-topic-panel {
  position: sticky;
  top: 30px;
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 20px 55px rgba(67, 52, 29, 0.07);
}

.seo-topic-panel h2 {
  margin: 12px 0 20px;
  font-size: 25px;
}

.seo-topic-panel > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.seo-topic-panel > div span {
  padding: 8px 10px;
  border-radius: 999px;
  background: #edf5f2;
  color: #32635e;
  font-size: 12px;
  font-weight: 700;
}

.seo-topic-panel hr {
  margin: 28px 0;
  border: 0;
  border-top: 1px solid rgba(28, 61, 57, 0.1);
}

.seo-boundary-note {
  margin: 0;
  color: #78817f;
  font-size: 12px;
  line-height: 1.8;
}

.seo-closing {
  width: min(1100px, calc(100% - 40px));
  margin: 0 auto 90px;
  padding: 70px;
  border-radius: 38px;
  background: #173e3a;
  color: #f7f1e4;
  text-align: center;
}

.seo-closing > p {
  color: #7dd3c7;
}

.seo-closing h2 {
  max-width: 760px;
  margin: 22px auto 30px;
  font-size: clamp(30px, 4vw, 50px);
}

.seo-closing a {
  display: inline-flex;
  min-height: 46px;
  padding: 0 22px;
  align-items: center;
  border-radius: 15px;
  background: #f8f2e7;
  color: #173e3a;
  font-size: 14px;
  font-weight: 800;
}

.seo-site-footer {
  display: grid;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 38px 0 50px;
  grid-template-columns: 1fr auto;
  gap: 20px 50px;
  border-top: 1px solid rgba(27, 55, 51, 0.1);
  color: #687370;
}

.seo-site-footer > div {
  display: grid;
  gap: 7px;
}

.seo-site-footer strong {
  color: #173e3a;
  font-family: "Songti SC", SimSun, serif;
  font-size: 20px;
}

.seo-site-footer span,
.seo-site-footer p {
  font-size: 11px;
}

.seo-site-footer p {
  grid-column: 1 / -1;
  margin: 0;
  line-height: 1.8;
}

.seo-error-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
}

.seo-error-page main {
  display: flex;
  width: min(560px, calc(100% - 36px));
  padding: 64px 34px;
  flex-direction: column;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 36px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 30px 90px rgba(67, 52, 29, 0.1);
  text-align: center;
}

.seo-error-page p {
  margin: 28px 0 10px;
  color: #0f766e;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.seo-error-page h1 {
  margin: 0;
  font-family: "Songti SC", SimSun, serif;
  font-size: 38px;
}

.seo-error-page span {
  margin-top: 16px;
  color: #6c7775;
  font-size: 14px;
}

.seo-error-page a {
  margin-top: 28px;
  padding: 13px 20px;
  border-radius: 14px;
  background: #173e3a;
  color: white;
  font-size: 14px;
  font-weight: 800;
}

@media (max-width: 900px) {
  .seo-site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .seo-hero {
    grid-template-columns: 1fr;
    min-height: 0;
    padding: 64px 42px;
    gap: 38px;
  }

  .seo-principle-card {
    max-width: 420px;
  }

  .seo-feature-grid {
    grid-template-columns: 1fr;
    margin-top: 22px;
  }

  .seo-feature-card {
    min-height: 0;
  }

  .seo-reading-layout {
    grid-template-columns: 1fr;
    margin-top: 76px;
    gap: 20px;
  }

  .seo-topic-panel {
    position: static;
  }

  .seo-site-footer {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .seo-site-header,
  .seo-hero,
  .seo-feature-grid,
  .seo-reading-layout,
  .seo-closing,
  .seo-site-footer {
    width: min(100% - 24px, 1180px);
  }

  .seo-site-header {
    padding: 16px 0;
    gap: 16px;
  }

  .seo-brand small {
    max-width: 220px;
  }

  .seo-main-nav {
    gap: 8px 14px;
  }

  .seo-main-nav a {
    min-height: 30px;
    display: inline-flex;
    align-items: center;
    font-size: 12px;
  }

  .seo-hero {
    margin-top: 4px;
    padding: 46px 24px 28px;
    border-radius: 28px;
  }

  .seo-hero h1 {
    margin: 18px 0;
    font-size: 42px;
    letter-spacing: -0.04em;
  }

  .seo-lead {
    font-size: 16px;
    line-height: 1.85;
  }

  .seo-actions {
    display: grid;
  }

  .seo-button {
    width: 100%;
  }

  .seo-principle-card {
    padding: 28px;
    border-radius: 24px;
  }

  .seo-feature-card,
  .seo-topic-panel {
    padding: 24px;
    border-radius: 22px;
  }

  .seo-reading-layout {
    margin-top: 64px;
    margin-bottom: 62px;
  }

  .seo-content-section {
    grid-template-columns: 1fr;
    padding-bottom: 48px;
    gap: 14px;
  }

  .seo-content-section p {
    font-size: 16px;
    line-height: 1.9;
  }

  .seo-content-section ul {
    grid-template-columns: 1fr;
  }

  .seo-closing {
    padding: 48px 24px;
    border-radius: 28px;
  }

  .seo-site-footer nav {
    gap: 10px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}