:root {
  --bg: #f3f6fb;
  --paper: #ffffff;
  --ink: #172033;
  --muted: #637083;
  --line: #dfe6ef;
  --brand: #0f766e;
  --brand-dark: #0b5f59;
  --blue: #2563eb;
  --gold: #b7791f;
  --red: #dc3545;
  --soft: #eaf7f5;
  --shadow: 0 18px 55px rgba(30, 41, 59, .09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", Arial, sans-serif;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 72px;
  padding: 0 clamp(18px, 5vw, 72px);
  background: rgba(255, 255, 255, .9);
  border-bottom: 1px solid rgba(223, 230, 239, .8);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  white-space: nowrap;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a:hover {
  color: var(--brand-dark);
}

.site-nav a.active {
  color: var(--brand-dark);
  font-weight: 900;
}

.nav-action,
.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 800;
}

.nav-action,
.primary-btn {
  color: #fff;
  background: var(--brand);
}

.nav-action:hover,
.primary-btn:hover {
  background: var(--brand-dark);
}

.secondary-btn {
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
}

.menu-btn {
  display: none;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, .75fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: clamp(46px, 7vw, 96px) clamp(18px, 5vw, 72px);
  background:
    linear-gradient(135deg, rgba(15, 118, 110, .12), transparent 36%),
    radial-gradient(circle at 85% 16%, rgba(37, 99, 235, .13), transparent 34%),
    linear-gradient(180deg, #fbfdff, #f3f6fb);
}

.eyebrow,
.section-head p {
  margin: 0 0 12px;
  color: var(--brand);
  font-size: 14px;
  font-weight: 900;
}

.hero h1 {
  max-width: 880px;
  margin: 0;
  font-size: clamp(40px, 6.6vw, 72px);
  line-height: 1.08;
  letter-spacing: 0;
}

.lead {
  max-width: 780px;
  margin: 22px 0 0;
  color: #435064;
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.origin-panel {
  padding: 26px;
  background: rgba(255, 255, 255, .88);
  border: 1px solid rgba(223, 230, 239, .9);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.origin-top span {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--brand-dark);
  background: var(--soft);
  font-size: 12px;
  font-weight: 800;
}

.origin-top b {
  display: block;
  margin-top: 12px;
  font-size: 22px;
}

.version-path {
  display: grid;
  grid-template-columns: 1fr 28px 1fr 28px 1fr;
  align-items: center;
  margin-top: 26px;
}

.version-path div {
  min-height: 92px;
  padding: 16px 10px;
  border-radius: 8px;
  text-align: center;
  background: #f8fafc;
  border: 1px solid var(--line);
}

.version-path strong {
  display: block;
  color: var(--brand-dark);
  font-size: 26px;
}

.version-path span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.version-path i {
  height: 2px;
  background: var(--line);
}

.quick-facts {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 24px 0 0;
  list-style: none;
}

.quick-facts li {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border-radius: 8px;
  background: #f8fafc;
}

.quick-facts b {
  color: var(--brand-dark);
  font-size: 18px;
}

.quick-facts span {
  color: var(--muted);
  line-height: 1.5;
}

.section {
  padding: clamp(54px, 8vw, 96px) clamp(18px, 5vw, 72px);
}

.section-head {
  max-width: 850px;
  margin-bottom: 28px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(28px, 4.2vw, 46px);
  line-height: 1.22;
}

.story {
  background: #fff;
}

.story-card {
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #fff, #fbfcfe);
  box-shadow: 0 12px 36px rgba(30, 41, 59, .05);
}

.story-card p {
  margin: 0;
  color: #435064;
  line-height: 1.95;
}

.story-card p + p {
  margin-top: 14px;
}

.story-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.story-links a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--brand-dark);
  background: #fff;
  font-weight: 800;
  font-size: 13px;
}

.version-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.version-card {
  position: relative;
  overflow: hidden;
  padding: 26px;
  min-height: 390px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 12px 38px rgba(30, 41, 59, .06);
}

.version-card:before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  height: 5px;
  background: #94a3b8;
}

.version-card.featured:before {
  background: var(--blue);
}

.version-card.business:before {
  background: var(--brand);
}

.tag {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
}

.tag.free {
  color: #475569;
  background: #eef2f7;
}

.tag.open {
  color: #1d4ed8;
  background: #e9f1ff;
}

.tag.paid {
  color: var(--brand-dark);
  background: var(--soft);
}

.version-card h3 {
  margin: 22px 0 6px;
  font-size: 34px;
}

.version-card h4 {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.version-card p {
  margin: 18px 0 0;
  color: #526073;
  line-height: 1.75;
}

.version-card ul {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 22px 0 0;
  list-style: none;
}

.version-card li {
  position: relative;
  padding-left: 18px;
  color: #435064;
  line-height: 1.55;
}

.version-card li:before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
}

.compare-section {
  background: #fff;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 14px 42px rgba(30, 41, 59, .05);
}

.compare-table {
  width: 100%;
  min-width: 980px;
  border-collapse: collapse;
}

.compare-table th,
.compare-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
}

.compare-table th {
  position: sticky;
  top: 0;
  z-index: 2;
  color: #fff;
  background: #162033;
  font-size: 15px;
}

.compare-table th:first-child,
.compare-table td:first-child {
  width: 150px;
  font-weight: 900;
}

.compare-table tbody tr:nth-child(even) {
  background: #f8fafc;
}

.compare-table tbody tr:hover {
  background: #eef8f6;
}

.v6-section {
  background:
    linear-gradient(135deg, rgba(15, 118, 110, .1), transparent 35%),
    #f6f9fd;
}

.v6-layout {
  display: grid;
  grid-template-columns: minmax(300px, .72fr) minmax(0, 1.28fr);
  gap: 22px;
  align-items: start;
}

.v6-summary {
  position: sticky;
  top: 92px;
  padding: 28px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, #0f766e, #1d4ed8);
  box-shadow: var(--shadow);
}

.v6-summary h3 {
  margin: 0;
  font-size: 28px;
}

.v6-summary p {
  margin: 18px 0 24px;
  color: rgba(255, 255, 255, .86);
  line-height: 1.85;
}

.v6-summary .primary-btn {
  background: #fff;
  color: var(--brand-dark);
}

.update-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.update-list article {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  align-items: start;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.update-list b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  color: var(--brand-dark);
  background: var(--soft);
  font-size: 13px;
}

.update-list span {
  color: #435064;
  line-height: 1.65;
}

.choose-section {
  background: #fff;
}

.choose-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.choose-grid div {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfe;
}

.choose-grid b {
  display: block;
  margin-bottom: 10px;
  font-size: 18px;
}

.choose-grid span {
  color: var(--muted);
  line-height: 1.75;
}

.compare-demo-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}

.demo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-weight: 900;
}

.demo-btn:hover {
  background: var(--brand-dark);
}

.demo-btn-v5 {
  background: var(--blue);
}

.demo-btn-v5:hover {
  background: #1d4ed8;
}

.demo-btn-v6 {
  background: #162033;
}

.demo-btn-v6:hover {
  background: #0f172a;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(18px, 5vw, 72px);
  color: #cbd5e1;
  background: #111827;
}

.site-footer b {
  display: block;
  color: #fff;
}

.site-footer span {
  display: block;
  margin-top: 4px;
}

.footer-links {
  display: flex;
  gap: 14px;
}

.footer-links a {
  color: #fff;
  font-weight: 800;
}

@media (max-width: 980px) {
  .site-nav,
  .nav-action {
    display: none;
  }

  .menu-btn {
    display: inline-flex;
    align-items: center;
    margin-left: auto;
  }

  .site-header.open {
    flex-wrap: wrap;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .site-header.open .site-nav,
  .site-header.open .nav-action {
    display: flex;
    width: 100%;
  }

  .site-header.open .site-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-left: 0;
  }

  .hero,
  .v6-layout {
    grid-template-columns: 1fr;
  }

  .v6-summary {
    position: static;
  }

  .version-grid,
  .choose-grid,
  .compare-demo-actions {
    grid-template-columns: 1fr;
  }

  .version-card {
    min-height: auto;
  }
}

@media (max-width: 700px) {
  .hero h1 {
    font-size: 38px;
  }

  .lead {
    font-size: 16px;
  }

  .version-path {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .version-path i {
    width: 2px;
    height: 22px;
    justify-self: center;
  }

  .quick-facts li {
    grid-template-columns: 1fr;
  }

  .update-list {
    grid-template-columns: 1fr;
  }

  .site-footer {
    display: block;
  }

  .footer-links {
    margin-top: 16px;
  }
}