:root {
  --container-width: 1200px;
  --black: #000;
  --white: #fff;
  --panel: rgba(255, 255, 255, 0.06);
  --panel-border: rgba(255, 255, 255, 0.12);
  --muted: rgba(255, 255, 255, 0.72);
  --overlay: rgba(0, 0, 0, 0.4);
  --primary: #8ec5ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  background-color: var(--black);
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--white);
  padding-bottom: 110px;
}

main {
  min-height: 100vh;
}

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

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

.container {
  width: min(100%, var(--container-width));
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  background-image: url('./img_banner.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-color: var(--overlay);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: 100%;
}

.hero-title,
.hero-subtitle {
  margin: 0;
  text-align: center;
  color: var(--white);
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.5rem;
  opacity: 0.9;
  line-height: 1.3;
  margin-bottom: 2.5rem;
}

.cta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 140px;
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #d9efff);
  color: #04111f;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--white);
}

.section {
  padding: 5rem 0;
  background: #050505;
}

.section-head {
  max-width: 760px;
  margin: 0 auto 2.5rem;
  text-align: center;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.75rem;
  font-weight: 700;
}

.section-title {
  margin: 0;
  font-size: clamp(2rem, 3vw, 2.6rem);
  line-height: 1.2;
  color: var(--white);
}

.section-copy {
  margin: 1rem auto 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 1.5rem 1.25rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  margin-bottom: 1rem;
  background: rgba(142, 197, 255, 0.12);
  border: 1px solid rgba(142, 197, 255, 0.24);
  color: var(--primary);
  font-weight: 700;
}

.feature-card h3 {
  margin: 0 0 0.7rem;
  font-size: 1.25rem;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

.footer-bar {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 1.5rem 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(4px);
}

.footer-meta {
  text-align: center;
  color: var(--white);
  font-size: 0.875rem;
  line-height: 1.6;
}

.beian-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  vertical-align: middle;
  white-space: nowrap;
}

.beian-icon {
  width: 16px;
  height: 16px;
  display: block;
  flex-shrink: 0;
  object-fit: contain;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 4.5rem;
  }

  .hero-subtitle {
    font-size: 1.875rem;
  }
}

@media (max-width: 768px) {
  .hero {
    background-image: url('./m_img_banner.jpg');
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.5rem;
  }

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

  .section {
    padding: 4rem 0;
  }

  .footer-meta {
    font-size: 12px;
  }

  .beian-link {
    white-space: normal;
  }
}