:root {
  --bg: #f6f9fc;
  --surface: #ffffff;
  --ink: #142033;
  --muted: #607086;
  --line: #dce6f2;
  --primary: #1268d6;
  --primary-dark: #0a4aa3;
  --cyan: #13b8d8;
  --mint: #1fbf9a;
  --amber: #f5a623;
  --shadow: 0 20px 50px rgba(17, 52, 98, 0.13);
  --radius: 8px;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}

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

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

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(220, 230, 242, 0.9);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  color: #fff;
  font-size: 15px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 10px 12px;
  border-radius: 8px;
  color: #35465f;
  font-size: 15px;
  font-weight: 600;
}

.nav-links a:hover,
.nav-links a.active {
  background: #eaf3ff;
  color: var(--primary-dark);
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: calc(100vh - 72px);
  padding: 70px 0 44px;
  background:
    radial-gradient(circle at 12% 18%, rgba(19, 184, 216, 0.16), transparent 26%),
    radial-gradient(circle at 90% 12%, rgba(31, 191, 154, 0.14), transparent 24%),
    linear-gradient(120deg, #f8fbff 0%, #edf6ff 56%, #f8fbff 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 48px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 800;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--cyan);
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.25;
}

h1 {
  margin-top: 18px;
  font-size: clamp(38px, 6vw, 66px);
  letter-spacing: 0;
}

.hero p {
  max-width: 620px;
  margin: 22px 0 0;
  color: #465872;
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 12px 30px rgba(18, 104, 214, 0.24);
}

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

.hero-visual {
  position: relative;
}

.hero-visual img {
  border-radius: 8px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.7);
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.metric {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
}

.metric strong {
  display: block;
  color: var(--primary-dark);
  font-size: 21px;
}

.metric span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 78px 0;
}

.section.white {
  background: #fff;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 32px;
}

.section-head p {
  max-width: 600px;
  margin: 8px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 20px;
}

.grid.three {
  grid-template-columns: repeat(3, 1fr);
}

.grid.two {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 28px rgba(25, 59, 94, 0.06);
}

.icon {
  display: grid;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  place-items: center;
  border-radius: 8px;
  background: #eaf6ff;
  color: var(--primary-dark);
  font-weight: 900;
}

.card p,
.content p,
.legal p,
.contact-list p {
  color: var(--muted);
}

.feature-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: #f7fbff;
  color: #40536c;
}

.page-hero {
  padding: 76px 0 52px;
  background: linear-gradient(120deg, #f7fbff, #eaf4ff);
}

.page-hero h1 {
  font-size: clamp(34px, 5vw, 54px);
}

.page-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
}

.download-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border-radius: 8px;
  background: #eef8f5;
  color: #0d7d65;
  font-size: 13px;
  font-weight: 800;
}

.legal {
  max-width: 920px;
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.legal h2 {
  margin-top: 28px;
  font-size: 22px;
}

.legal h2:first-child {
  margin-top: 0;
}

.legal ul {
  color: var(--muted);
}

.contact-panel {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 28px;
}

.contact-list {
  display: grid;
  gap: 14px;
}

.contact-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

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

.form label {
  display: grid;
  gap: 6px;
  color: #32455f;
  font-weight: 700;
}

.form input,
.form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--ink);
  font: inherit;
}

.form textarea {
  min-height: 130px;
  resize: vertical;
}

.site-footer {
  padding: 38px 0;
  background: #111c2c;
  color: #d8e4f2;
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: #aebed1;
}

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

@media (max-width: 900px) {
  .menu-button {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px 20px 18px;
    background: #fff;
    border-bottom: 1px solid var(--line);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 10px;
  }

  .hero {
    min-height: auto;
    padding-top: 46px;
  }

  .hero-grid,
  .grid.three,
  .grid.two,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .section-head,
  .download-box,
  .footer-grid {
    align-items: flex-start;
    flex-direction: column;
  }

  .metric-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .brand-text small {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .section {
    padding: 56px 0;
  }

  .legal,
  .card {
    padding: 22px;
  }
}