:root {
  --bg: #ffffff;
  --panel: #f7f9fc;
  --panel-strong: #eef5ff;
  --line: #e9edf3;
  --text: #252b33;
  --muted: #7f8794;
  --blue: #2b78f2;
  --blue-light: #66a8ff;
  --shadow: 0 18px 40px rgba(33, 88, 170, 0.08);
  --radius-lg: 28px;
  --radius-md: 18px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

.container {
  width: min(calc(100% - 48px), var(--container));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: inline-flex;
}

.brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand-text {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #1994fb;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 38px;
  font-size: 16px;
  color: #666d78;
}

.site-nav a {
  position: relative;
  transition: color 0.25s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--text);
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
}

.section {
  padding: 92px 0;
}

.hero {
  min-height: 540px;
  display: flex;
  align-items: center;
  background:
    radial-gradient(circle at 50% 18%, rgba(72, 146, 255, 0.08), transparent 30%),
    linear-gradient(180deg, #f8fbff 0%, #ffffff 58%);
}

.hero-content {
  text-align: center;
}

.hero h1 {
  margin: 0;
  font-size: clamp(40px, 5vw, 60px);
  line-height: 1.2;
  font-weight: 800;
}

.hero p {
  margin: 22px auto 0;
  max-width: 760px;
  font-size: 18px;
  line-height: 1.8;
  color: var(--muted);
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 166px;
  height: 56px;
  margin-top: 30px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--blue-light), var(--blue));
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  box-shadow: 0 14px 30px rgba(43, 120, 242, 0.24);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.primary-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 38px rgba(43, 120, 242, 0.3);
}

.section-title {
  margin: 0 0 44px;
  text-align: center;
  font-size: clamp(30px, 3vw, 44px);
  font-weight: 800;
  line-height: 1.2;
}

.align-left {
  text-align: left;
}

.features-section {
  background: #fff;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 26px;
}

.feature-card {
  padding: 34px 24px 28px;
  background: linear-gradient(180deg, #ffffff 0%, #fafbfd 100%);
  border: 1px solid #f0f3f8;
  border-radius: 18px;
  box-shadow: 0 10px 24px rgba(27, 43, 73, 0.03);
  text-align: center;
}

.feature-icon {
  width: 62px;
  height: 62px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.feature-card h3 {
  margin: 0 0 12px;
  font-size: 18px;
}

.feature-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
  text-align: left;
}

.about-section {
  background: linear-gradient(180deg, #f5faff 0%, #f7fbff 100%);
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 420px);
  gap: 48px;
  align-items: center;
}

.about-copy p {
  margin: 0;
  font-size: 17px;
  line-height: 2.1;
  color: #5f6874;
}

.phone-showcase {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 28px;
}

.phone-frame {
  position: relative;
  width: 148px;
  flex: 0 0 148px;
  filter: drop-shadow(0 18px 34px rgba(33, 88, 170, 0.12));
}

.phone-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.phone-left {
  /* transform: translateY(-12px); */
}

.contact-section {
  padding-top: 88px;
  padding-bottom: 112px;
}

.contact-inner {
  text-align: center;
}

.contact-list p {
  margin: 14px 0;
  font-size: 16px;
  color: #68707d;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 26px 0 32px;
  text-align: center;
  color: #9ca4af;
  font-size: 14px;
}

@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .about-copy .section-title {
    text-align: center;
  }

  .about-copy p {
    text-align: left;
  }
}

@media (max-width: 768px) {
  .container {
    width: min(calc(100% - 32px), var(--container));
  }

  .header-inner {
    min-height: 64px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 12px 0;
  }

  .site-nav {
    width: 100%;
    justify-content: center;
    gap: 22px;
    font-size: 14px;
    flex-wrap: wrap;
  }

  .section {
    padding: 70px 0;
  }

  .hero {
    min-height: 460px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero p,
  .about-copy p,
  .feature-card p {
    font-size: 14px;
  }

  .primary-button {
    min-width: 140px;
    height: 50px;
    font-size: 20px;
  }

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

  .phone-showcase {
    gap: 18px;
    transform: scale(0.94);
    transform-origin: center top;
  }
}