:root {
  --bg: #f5fbff;
  --surface: #ffffff;
  --ink: #102033;
  --muted: #667789;
  --line: #dceaf2;
  --blue: #28b8df;
  --cyan: #55d6d2;
  --gold: #e6b458;
  --deep: #17283d;
  --shadow: 0 24px 70px rgba(35, 76, 106, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 15% 8%, rgba(85, 214, 210, .25), transparent 30%),
    radial-gradient(circle at 85% 0%, rgba(40, 184, 223, .2), transparent 28%),
    var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei UI", "PingFang SC", Arial, sans-serif;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.site-header {
  position: fixed;
  z-index: 20;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: min(1180px, calc(100% - 32px));
  height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 12px 0 18px;
  background: rgba(255, 255, 255, .84);
  border: 1px solid rgba(220, 234, 242, .96);
  box-shadow: 0 14px 42px rgba(36, 76, 106, .1);
  backdrop-filter: blur(20px);
  transition: background .2s ease, box-shadow .2s ease;
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, .97);
  box-shadow: 0 18px 48px rgba(36, 76, 106, .14);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 950;
  font-size: 20px;
}
.brand img { width: 38px; height: 38px; border-radius: 10px; }
.nav { display: flex; gap: 34px; color: #395168; font-weight: 800; }
.nav a { position: relative; }
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -10px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .22s ease;
}
.nav a:hover::after { transform: scaleX(1); }
.nav-cta {
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 8px;
  background: var(--deep);
  color: #fff;
  font-weight: 950;
}

.hero {
  width: min(1220px, calc(100% - 36px));
  min-height: 92vh;
  margin: 0 auto;
  padding: 122px 0 48px;
  display: grid;
  grid-template-columns: .88fr 1.12fr;
  align-items: center;
  gap: 28px;
}
.eyebrow {
  margin: 0 0 14px;
  color: #16a7c8;
  font-size: 13px;
  font-weight: 950;
  text-transform: uppercase;
}
h1, h2, h3, p { margin: 0; }
h1 {
  max-width: 540px;
  font-size: clamp(44px, 5.4vw, 68px);
  line-height: 1.06;
  font-weight: 950;
}
.lead {
  max-width: 560px;
  margin-top: 20px;
  color: #52677a;
  font-size: 18px;
  line-height: 1.82;
  font-weight: 650;
}
.hero-actions, .download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}
.btn {
  min-width: 168px;
  height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 950;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary {
  color: #fff;
  background: linear-gradient(135deg, #1cc1e8, #42d2c2);
  box-shadow: 0 16px 32px rgba(33, 186, 213, .26);
}
.btn.secondary {
  color: #183047;
  background: #fff;
  border-color: #cfe2ec;
  box-shadow: 0 12px 30px rgba(36, 76, 106, .08);
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
  max-width: 610px;
}
.hero-stats span {
  padding: 14px;
  background: rgba(255, 255, 255, .72);
  border: 1px solid rgba(220, 234, 242, .9);
  border-radius: 8px;
  color: var(--muted);
}
.hero-stats strong {
  display: block;
  color: var(--ink);
  margin-bottom: 4px;
}
.hero-visual {
  position: relative;
  padding: 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, .72);
  border: 1px solid rgba(220, 234, 242, .9);
  box-shadow: var(--shadow);
}
.hero-visual img { border-radius: 8px; }

.compare-section, .feature-section, .workflow-section, .advantage-section, .download-section {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}
.section-title {
  max-width: 820px;
  margin: 0 auto 36px;
  text-align: center;
}
.section-title.narrow { max-width: 720px; }
.section-title h2, .workflow-copy h2, .download-section h2 {
  font-size: clamp(32px, 4.2vw, 54px);
  line-height: 1.18;
  font-weight: 950;
}
.section-title p:not(.eyebrow), .workflow-copy p, .download-section p {
  margin-top: 16px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.9;
  font-weight: 650;
}
.compare-section { padding: 48px 0 90px; }
.compare-card {
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.compare-card img { width: 100%; border-radius: 8px; }

.feature-section {
  padding: 82px 0;
  border-top: 1px solid var(--line);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 22px;
}
.feature-grid article, .advantage-card {
  min-height: 220px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 16px 40px rgba(36, 76, 106, .08);
}
.feature-grid strong {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: #e8f8fb;
  color: #12a9c9;
  margin-bottom: 34px;
}
.feature-grid h3, .advantage-card h3 {
  font-size: 23px;
  margin-bottom: 10px;
}
.feature-grid p, .advantage-card p {
  color: var(--muted);
  line-height: 1.8;
  font-weight: 650;
}
.wide-art {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.workflow-section {
  padding: 84px 0;
  display: grid;
  grid-template-columns: .86fr 1.14fr;
  align-items: center;
  gap: 34px;
}
.workflow-section img {
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.workflow-copy ul {
  list-style: none;
  padding: 0;
  margin: 26px 0 0;
  display: grid;
  gap: 10px;
}
.workflow-copy li {
  position: relative;
  padding: 14px 14px 14px 42px;
  background: rgba(255, 255, 255, .78);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #33495f;
  font-weight: 800;
}
.workflow-copy li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 19px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}

.advantage-section {
  padding: 24px 0 90px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.advantage-card span {
  display: inline-flex;
  margin-bottom: 40px;
  color: #0fa9c9;
  font-weight: 950;
}

.download-section {
  margin-bottom: 36px;
  padding: 54px;
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: center;
  border-radius: 8px;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, .96), rgba(229, 247, 251, .94)),
    #fff;
  box-shadow: var(--shadow);
}
.download-section p { max-width: 620px; }
.download-actions { margin-top: 0; flex-shrink: 0; }

.footer {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 28px 0 42px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: #5d7184;
  font-weight: 800;
}
.toast {
  position: fixed;
  z-index: 30;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 20px);
  min-width: min(420px, calc(100% - 32px));
  padding: 14px 18px;
  border-radius: 8px;
  background: var(--deep);
  color: #fff;
  text-align: center;
  font-weight: 900;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 980px) {
  .nav { display: none; }
  .hero, .workflow-section {
    grid-template-columns: 1fr;
  }
  .hero {
    min-height: auto;
    padding-top: 120px;
  }
  .feature-grid, .advantage-section {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .download-section {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .site-header {
    top: 10px;
    width: calc(100% - 20px);
    height: 58px;
  }
  .brand span { font-size: 17px; }
  .nav-cta { height: 38px; padding: 0 12px; font-size: 14px; }
  .hero, .compare-section, .feature-section, .workflow-section, .advantage-section, .download-section, .footer {
    width: calc(100% - 28px);
  }
  .hero { padding-bottom: 54px; }
  .hero-stats, .feature-grid, .advantage-section {
    grid-template-columns: 1fr;
  }
  .hero-actions, .download-actions {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }
  .btn { width: 100%; }
  .download-section { padding: 28px; }
  .footer {
    flex-direction: column;
    align-items: flex-start;
  }
}