:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --text: #182230;
  --text-2: #526071;
  --text-3: #8b97a8;
  --line: #e2e8f0;
  --brand: #1f5f55;
  --brand-2: #2563eb;
  --accent: #b7791f;
  --ok: #15803d;
  --shadow: 0 18px 50px rgba(15, 23, 42, .12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

code {
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--brand);
  font-family: Consolas, monospace;
  font-size: .92em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 max(28px, calc((100vw - 1160px) / 2));
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid rgba(226, 232, 240, .9);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font-weight: 900;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--text-2);
  font-size: 14px;
}

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

.header-download {
  height: 36px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 6px;
  background: var(--text);
  color: #fff;
  font-size: 14px;
  white-space: nowrap;
}

.hero {
  width: min(1160px, calc(100vw - 48px));
  min-height: calc(100vh - 132px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(440px, 520px);
  gap: 54px;
  align-items: center;
  padding: 54px 0 42px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 18px;
  max-width: 620px;
  font-size: clamp(42px, 6vw, 68px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(26px, 3.5vw, 40px);
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.hero-text {
  max-width: 610px;
  color: var(--text-2);
  font-size: 18px;
}

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

.btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 7px;
  font-weight: 800;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background: #17483f;
}

.btn-secondary {
  background: var(--surface);
  border-color: var(--line);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: #cbd5e1;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
  color: var(--text-2);
  font-size: 13px;
}

.hero-meta span {
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .72);
}

.hero-panel {
  min-width: 0;
}

.product-shot {
  position: relative;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.product-shot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.shot-badge {
  position: absolute;
  right: 22px;
  bottom: 22px;
  max-width: 250px;
  padding: 12px 14px;
  border: 1px solid rgba(226, 232, 240, .92);
  border-radius: 8px;
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 12px 28px rgba(15, 23, 42, .14);
}

.shot-badge b,
.shot-badge span {
  display: block;
}

.shot-badge b {
  margin-bottom: 3px;
  font-size: 14px;
}

.shot-badge span {
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.5;
}

.trust-row,
.section,
.cta {
  width: min(1160px, calc(100vw - 48px));
  margin: 0 auto;
}

.trust-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding-bottom: 40px;
}

.trust-row div,
.steps article,
.section,
.cta {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(15, 23, 42, .05);
}

.trust-row div {
  padding: 18px;
}

.trust-row b {
  display: block;
  color: var(--brand);
  font-size: 30px;
  line-height: 1;
}

.trust-row span {
  display: block;
  margin-top: 8px;
  color: var(--text-2);
  font-size: 13px;
}

.section {
  margin-bottom: 26px;
  padding: 38px;
}

.section-head {
  max-width: 720px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.steps article {
  padding: 22px;
}

.steps article span {
  color: var(--accent);
  font-weight: 900;
}

.steps p,
.section-copy,
.video-card p,
.cta p {
  color: var(--text-2);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(360px, 1fr);
  gap: 34px;
  align-items: center;
}

.module-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.module-list span {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
  font-weight: 800;
  text-align: center;
}

.video-card {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(260px, .7fr);
  gap: 22px;
  align-items: center;
}

video {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0f172a;
}

.muted {
  color: var(--text-3);
  font-size: 13px;
}

.cta {
  margin-bottom: 34px;
  padding: 42px;
  text-align: center;
}

.site-footer {
  width: min(1160px, calc(100vw - 48px));
  margin: 0 auto;
  padding: 24px 0 32px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--text-3);
  font-size: 13px;
}

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

@media (max-width: 980px) {
  .site-header {
    padding: 0 18px;
  }

  .site-nav {
    display: none;
  }

  .hero,
  .split,
  .video-card {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 30px;
  }

  .hero-panel {
    order: -1;
  }

  .trust-row,
  .steps,
  .module-list {
    grid-template-columns: 1fr;
  }

  .section,
  .cta {
    padding: 24px;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .header-download {
    display: none;
  }

  .hero,
  .trust-row,
  .section,
  .cta,
  .site-footer {
    width: min(100vw - 28px, 1160px);
  }

  h1 {
    font-size: 38px;
  }

  .shot-badge {
    position: static;
    max-width: none;
    margin-top: 10px;
  }
}