:root {
  --text: #17202a;
  --muted: #5d6b80;
  --line: #dbe3ef;
  --bg: #f6f8fb;
  --panel: #ffffff;
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --soft-blue: #eaf1ff;
}

* {
  box-sizing: border-box;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(246, 248, 251, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  font-weight: 800;
  font-size: 20px;
}

nav {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--muted);
  font-size: 15px;
}

.nav-download {
  color: var(--blue);
  font-weight: 700;
}

.hero {
  display: grid;
  grid-template-columns: minmax(320px, 0.85fr) minmax(420px, 1.15fr);
  align-items: center;
  gap: 48px;
  padding: 72px clamp(20px, 5vw, 72px) 52px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 20px;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.2;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.lead {
  max-width: 640px;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.75;
}

.hero-actions,
.pricing-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  color: #fff;
  background: var(--blue);
  border-color: var(--blue);
}

.button.primary:hover {
  background: var(--blue-dark);
}

.button.secondary {
  color: var(--text);
  background: #fff;
}

.trial-note,
.small-note {
  margin-top: 16px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.hero-media img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(37, 99, 235, 0.16);
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 0 clamp(20px, 5vw, 72px) 72px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.trust-strip div {
  padding: 24px;
  background: var(--panel);
}

.trust-strip strong,
.trust-strip span {
  display: block;
}

.trust-strip strong {
  margin-bottom: 8px;
  font-size: 18px;
}

.trust-strip span {
  color: var(--muted);
}

.section,
.workflow,
.privacy {
  padding: 72px clamp(20px, 5vw, 72px);
}

.section-head {
  max-width: 760px;
  margin-bottom: 30px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feature-grid article,
.price-card,
.faq details {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.feature-grid p,
.price-card li,
.faq p,
.privacy p,
.workflow p {
  color: var(--muted);
  line-height: 1.7;
}

.workflow {
  display: grid;
  grid-template-columns: minmax(260px, 0.6fr) 1fr;
  gap: 42px;
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.workflow ol {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.workflow li {
  padding: 26px;
  border-radius: 8px;
  background: var(--soft-blue);
}

.workflow span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 18px;
  color: #fff;
  border-radius: 50%;
  background: var(--blue);
  font-weight: 800;
}

.pricing-section {
  background: #f9fbff;
}

.pricing-grid {
  align-items: stretch;
}

.price-card {
  flex: 1 1 320px;
}

.price-card.highlighted {
  border-color: #9db7ff;
  box-shadow: 0 18px 50px rgba(37, 99, 235, 0.14);
}

.price {
  font-size: 34px;
  font-weight: 900;
}

.price-card ul {
  padding-left: 18px;
  margin-bottom: 24px;
}

.price-card li + li {
  margin-top: 10px;
}

.privacy {
  display: grid;
  grid-template-columns: minmax(260px, 0.7fr) 1fr;
  gap: 40px;
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.faq {
  display: grid;
  gap: 14px;
}

.faq details {
  padding: 20px 24px;
}

.faq summary {
  cursor: pointer;
  font-weight: 800;
}

.faq p {
  margin: 12px 0 0;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 32px clamp(20px, 5vw, 72px);
  color: var(--muted);
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer a {
  color: var(--blue);
  font-weight: 800;
}

@media (max-width: 980px) {
  .hero,
  .workflow,
  .privacy {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .workflow ol,
  .trust-strip {
    grid-template-columns: 1fr;
  }

  nav {
    display: none;
  }
}

@media (max-width: 560px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding-top: 44px;
  }

  .button {
    width: 100%;
  }
}