:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-soft: #eff6ff;
  --text: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --bg: #f6f8fb;
  --card: #ffffff;
  --radius: 8px;
  --shadow: 0 14px 36px rgba(37, 99, 235, 0.08);
  --header-height: 69px;
  --font: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  padding-top: var(--header-height);
  overflow-x: hidden;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  line-height: 1.7;
  letter-spacing: 0;
}

body.nav-lock {
  overflow: hidden;
}

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

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  position: fixed;
  z-index: 20;
  top: 0;
  right: 0;
  left: 0;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

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

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--primary);
  font-size: 18px;
  font-weight: 800;
  white-space: nowrap;
}

.logo i {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  color: #fff;
  background: var(--primary);
}

.nav-toggle {
  width: 42px;
  height: 42px;
  display: none;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--primary);
  background: #fff;
  cursor: pointer;
  font-size: 18px;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  color: #fff;
  background: var(--primary);
  outline: none;
}

.nav-menu {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-menu a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--primary);
  background: var(--primary-soft);
}

.hero {
  padding: 76px 0 64px;
  color: #fff;
  background:
    linear-gradient(120deg, rgba(37, 99, 235, 0.96), rgba(22, 163, 74, 0.78)),
    #2563eb;
}

.page-hero {
  padding: 56px 0;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(36px, 6vw, 58px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero p {
  max-width: 760px;
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  color: var(--primary);
  background: #fff;
  font-weight: 800;
  cursor: pointer;
}

.btn:hover {
  color: var(--primary-dark);
}

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

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

.btn-outline {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
  background: transparent;
}

.btn-outline:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.section {
  padding: 58px 0;
}

.section-light {
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.title {
  margin: 0 0 24px;
  text-align: center;
  font-size: 30px;
  line-height: 1.25;
}

.features {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.card,
.download-box,
.content-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card {
  padding: 22px;
}

.card i {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  color: var(--primary);
  background: var(--primary-soft);
  margin-bottom: 14px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.card:has(> i) {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: start;
  column-gap: 14px;
  row-gap: 4px;
}

.card:has(> i) i {
  grid-row: 1 / span 2;
  margin-bottom: 0;
}

.card:has(> i) h3 {
  margin: 0;
  line-height: 1.35;
}

.card:has(> i) p {
  grid-column: 2;
}

.download-area {
  background: #eff6ff;
}

.download-box {
  padding: 30px;
  text-align: center;
}

.download-box h3 {
  margin: 0 0 10px;
  font-size: 22px;
}

.download-box p {
  max-width: 720px;
  margin: 0 auto 22px;
  color: var(--muted);
}

.meta {
  color: #8a94a6;
}

.content-panel {
  padding: 28px;
}

.content-panel h2 {
  margin: 0 0 10px;
  font-size: 24px;
}

.content-panel h2:not(:first-child) {
  margin-top: 26px;
}

.content-panel p,
.content-panel li {
  color: var(--muted);
}

.content-panel a {
  color: var(--primary);
  font-weight: 700;
}

.content-panel ol {
  margin: 0;
  padding-left: 22px;
}

footer {
  background: #111827;
  color: rgba(255, 255, 255, 0.78);
}

footer p {
  margin: 0;
  padding: 22px 0;
  text-align: center;
  font-size: 14px;
}

footer a {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 700;
}

footer a:hover {
  color: #fff;
}

@media (max-width: 960px) {
  .features {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  :root {
    --header-height: 65px;
  }

  .nav {
    min-height: 64px;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px 0;
  }

  .nav::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 25;
    visibility: hidden;
    background: rgba(17, 24, 39, 0.46);
    opacity: 0;
    transition: opacity 0.22s ease, visibility 0.22s ease;
  }

  .nav.nav-open::before {
    visibility: visible;
    opacity: 1;
  }

  .logo {
    max-width: calc(100% - 58px);
    min-width: 0;
    overflow: hidden;
    font-size: 17px;
    text-overflow: ellipsis;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
    position: relative;
    z-index: 35;
  }

  .nav.nav-open .nav-toggle {
    color: #fff;
    border-color: var(--primary);
    background: var(--primary);
  }

  .nav-menu {
    width: min(82vw, 300px);
    height: 100dvh;
    max-height: none;
    position: fixed;
    top: 0;
    right: 0;
    z-index: 30;
    display: grid;
    grid-template-columns: 1fr;
    align-content: start;
    gap: 10px;
    padding: 78px 16px 20px;
    overflow-y: auto;
    visibility: hidden;
    background: #fff;
    border-left: 1px solid var(--line);
    box-shadow: -18px 0 38px rgba(17, 24, 39, 0.18);
    opacity: 1;
    transform: translateX(105%);
    transition: transform 0.24s ease, visibility 0.24s ease;
  }

  .nav.nav-open .nav-menu {
    visibility: visible;
    transform: translateX(0);
  }

  .nav-menu a {
    width: 100%;
    min-height: 44px;
    justify-content: flex-start;
    border: 1px solid var(--line);
    background: #fff;
  }
}

@media (max-width: 620px) {
  .container {
    width: min(100% - 24px, 1120px);
  }

  .hero {
    padding: 48px 0;
  }

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

  .hero-actions,
  .btn {
    width: 100%;
  }
}