:root {
  --blue: #2f6fed;
  --blue-hover: #245cd1;
  --gold: #c8881a;
  --text: #1f2a37;
  --muted: #5b6775;
  --line: #d5dde7;
  --bg: #f5f7fb;
  --card: #ffffff;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

a {
  color: var(--blue);
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.wrap {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  font-size: 18px;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.nav {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-weight: 600;
}

.nav a {
  color: var(--muted);
}

.nav a:hover {
  color: var(--blue);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--blue-hover);
  color: #fff;
}

.btn-ghost {
  background: #fff;
  border-color: var(--line);
  color: var(--text);
}

.hero {
  padding: 64px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.kicker {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: #e8f0fe;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
}

h1 {
  margin: 14px 0 12px;
  font-size: 42px;
  line-height: 1.2;
}

.lead {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 18px;
}

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

.hero-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 12px 40px rgba(31, 42, 55, 0.06);
}

.hero-card img {
  width: 92px;
  height: 92px;
  border-radius: 22px;
  margin-bottom: 16px;
}

.hero-card h2 {
  margin: 0 0 8px;
  font-size: 22px;
}

.hero-card p {
  margin: 0;
  color: var(--muted);
}

.section {
  padding: 28px 0 12px;
  scroll-margin-top: 84px;
}

.section h3 {
  margin: 0 0 8px;
  font-size: 28px;
}

.section .intro {
  margin: 0 0 22px;
  color: var(--muted);
}

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

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

.card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 17px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 10px;
}

.step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 10px;
  text-align: center;
}

.step b {
  display: block;
  color: var(--blue);
  margin-bottom: 6px;
}

.pricing {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.price-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
}

.price-card.featured {
  border-color: #f0d19a;
  box-shadow: inset 0 0 0 1px #f7e6c4;
}

.tag {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--gold);
  font-weight: 800;
}

.price {
  font-size: 40px;
  font-weight: 800;
  color: var(--blue);
}

.price small {
  font-size: 16px;
  color: var(--muted);
  font-weight: 600;
}

.old {
  margin: 6px 0 14px;
  color: #8b95a1;
  text-decoration: line-through;
}

.price-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.download-box,
.contact-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
}

.note {
  margin-top: 10px;
  color: var(--muted);
}

.footer {
  margin-top: 48px;
  padding: 28px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .hero-grid,
  .cards,
  .pricing,
  .steps {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr 1fr;
  }

  h1 {
    font-size: 32px;
  }

  .nav {
    display: none;
  }
}