/* Shared styles — 山海信 文档页 */
:root {
  --bg: #f5f8ff;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --border: #d7e1f5;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #4f46e5;
  --accent-dim: #3730a3;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: radial-gradient(circle at top, rgba(79, 70, 229, 0.12), transparent 35%),
    linear-gradient(180deg, #f8fbff 0%, #f5f8ff 100%);
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px 56px;
}

.site-header {
  padding: 24px 0;
  margin-bottom: 16px;
}

.site-header .inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.03em;
  color: var(--text);
}

.brand-logo {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 14px;
  border: 1px solid rgba(79, 70, 229, 0.15);
  background: #ffffff;
}

.brand-text {
  line-height: 1.1;
}

.nav-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 180ms ease;
}

.nav-links a:hover {
  color: var(--accent);
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.3rem);
  font-weight: 800;
  margin: 0;
  line-height: 1.05;
}

h2 {
  font-size: 1.5rem;
  margin: 0 0 18px;
  color: var(--text);
}

p,
li {
  color: #475569;
  margin: 0 0 16px;
}

ul,
ol {
  padding-left: 1.4em;
  margin: 0 0 18px;
}

footer.site-footer {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

footer.site-footer a {
  margin-right: 18px;
}

.hero {
  text-align: center;
  padding: 68px 0 54px;
  background: linear-gradient(180deg, #ffffff 0%, #eff4ff 100%);
  border-radius: 40px;
  box-shadow: 0 28px 80px rgba(79, 70, 229, 0.08);
  margin-bottom: 28px;
}

.hero-logo {
  display: block;
  width: min(124px, 25vw);
  height: auto;
  margin: 0 auto 24px;
  object-fit: contain;
  border-radius: 22px;
  box-shadow: 0 18px 40px rgba(79, 70, 229, 0.12);
}

.hero .lead {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 640px;
  margin: 20px auto 0;
}

.hero-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 28px auto 0;
  padding: 14px 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, #4f46e5 0%, #2563eb 100%);
  color: #ffffff;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: transform 180ms ease, box-shadow 180ms ease;
  box-shadow: 0 18px 34px rgba(79, 70, 229, 0.2);
}

.hero-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 40px rgba(79, 70, 229, 0.24);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin: 40px 0;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 26px;
  box-shadow: 0 16px 30px rgba(15, 23, 42, 0.04);
  transition: transform 180ms ease, border-color 180ms ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(79, 70, 229, 0.18);
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--accent-dim);
}

.feature-card p {
  margin: 0;
  font-size: 0.96rem;
}

.screens {
  margin: 56px auto;
  padding: 0 20px;
  max-width: 1100px;
}

.screens h2 {
  text-align: center;
  margin-bottom: 28px;
}

.screen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
  justify-items: center;
}

.screen-card {
  width: 100%;
  max-width: 320px;
  background: #ffffff;
  border: 1px solid rgba(71, 85, 105, 0.08);
  border-radius: 28px;
  overflow: hidden;
  box-shadow: 0 16px 38px rgba(15, 23, 42, 0.06);
}

.screen-card figcaption {
  padding: 16px 18px;
  font-size: 0.95rem;
  color: var(--muted);
  border-top: 1px solid rgba(71, 85, 105, 0.08);
}

.screen-card img {
  display: block;
  width: 100%;
  height: auto;
  background: #f8fafd;
  min-height: 220px;
  object-fit: cover;
}

.contact-box {
  background: #ffffff;
  border: 1px solid rgba(79, 70, 229, 0.12);
  border-radius: 24px;
  padding: 26px;
  text-align: center;
  margin-top: 40px;
  box-shadow: 0 20px 48px rgba(79, 70, 229, 0.06);
}

.contact-box strong {
  color: var(--text);
}

@media (max-width: 680px) {
  .site-header .inner,
  footer.site-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    gap: 14px;
  }
}

@media (max-width: 520px) {
  .wrap {
    padding-bottom: 40px;
  }

  h1 {
    font-size: 2.2rem;
  }

  .hero {
    padding: 52px 0 42px;
    border-radius: 28px;
  }

  .hero .lead {
    font-size: 1rem;
  }
}