:root {
  /* 亮色科技风主色系 */
  --bg: #f5f7fb;
  --bg-alt: #ffffff;
  --bg-card: #ffffff;
  --border-subtle: rgba(15, 23, 42, 0.06);
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --accent-strong: rgba(37, 99, 235, 0.18);
  --accent-secondary: #22c55e;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #9ca3af;
  --danger: #ef4444;
  --success: #16a34a;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.3);
  --blur-bg: 18px;
  --transition-fast: 0.16s ease-out;
  --transition-normal: 0.22s ease-out;
}
  
  /* Reset & base */
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  
html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  color: var(--text-primary);
  background:
    radial-gradient(circle at top left, rgba(191, 219, 254, 0.9) 0, rgba(239, 246, 255, 0.9) 35%, transparent 60%),
    radial-gradient(circle at bottom right, rgba(221, 239, 253, 0.9) 0, var(--bg) 45%);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
}
  
  img {
    max-width: 100%;
    display: block;
  }
  
  a {
    color: inherit;
    text-decoration: none;
  }
  
  .container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  /* Header & nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(20px);
  background: linear-gradient(to bottom, rgba(248, 250, 252, 0.96), rgba(248, 250, 252, 0.9), transparent);
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}
  
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
  }
  
  .logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
  }
  
.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 12px;
  background: radial-gradient(circle at 30% 20%, #60a5fa, #2563eb 45%, #22c55e 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #eff6ff;
  box-shadow: var(--shadow-glow);
}
  
.logo-text {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}
  
  .nav {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 13px;
  }
  
.nav a {
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.nav a:hover {
  color: var(--accent);
  background: rgba(148, 163, 184, 0.12);
  transform: translateY(-1px);
}
  
  /* Mobile nav */
.nav-toggle {
  display: none;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
  
.nav-toggle span {
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: #0f172a;
  transition: var(--transition-fast);
}
  
  .nav-toggle.open span:nth-child(1) {
    transform: translateY(3px) rotate(45deg);
  }
  
  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.open span:nth-child(3) {
    transform: translateY(-3px) rotate(-45deg);
  }
  
  /* Hero */
.hero {
  position: relative;
  padding: 72px 0 72px;
  overflow: hidden;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 0%, rgba(191, 219, 254, 0.9), transparent 45%),
    radial-gradient(circle at 90% 20%, rgba(221, 239, 253, 0.9), transparent 55%);
  opacity: 1;
  pointer-events: none;
}
  
  .hero-inner {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
    z-index: 1;
  }
  
  .hero-content h1 {
    font-size: 36px;
    line-height: 1.2;
    letter-spacing: 0.02em;
    margin: 0 0 16px;
  }
  
  .hero-subtitle {
    margin: 0 0 24px;
    max-width: 460px;
    color: var(--text-secondary);
    font-size: 15px;
  }
  
  .hero-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 26px;
  }
  
  .btn-primary,
  .btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: background var(--transition-normal), transform var(--transition-fast), box-shadow var(--transition-normal),
      border-color var(--transition-fast);
  }
  
.btn-primary {
  background: linear-gradient(120deg, #2563eb, #22c55e);
  color: #f9fafb;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.4);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-primary);
  border: 1px solid rgba(148, 163, 184, 0.7);
}

.btn-ghost:hover {
  background: var(--accent-soft);
  border-color: rgba(37, 99, 235, 0.8);
}
  
  .hero-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    max-width: 520px;
  }
  
  .meta-label {
    display: block;
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 4px;
  }
  
  .meta-value {
    font-size: 13px;
    color: var(--text-secondary);
  }
  
  /* Hero visual */
  .hero-visual {
    position: relative;
    display: grid;
    gap: 16px;
  }
  
.hero-card {
  background: radial-gradient(circle at 0 0, rgba(191, 219, 254, 0.9), transparent 60%), var(--bg-card);
  border-radius: 22px;
  padding: 20px 20px 18px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(var(--blur-bg));
}
  
  .hero-card-label {
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(224, 231, 255, 0.8);
    margin-bottom: 8px;
  }
  
  .hero-card h3 {
    font-size: 16px;
    margin: 0 0 10px;
  }
  
  .hero-card ul {
    margin: 0;
    padding-left: 18px;
    color: var(--text-secondary);
    font-size: 13px;
  }
  
  .hero-card li {
    margin-bottom: 4px;
  }
  
  .hero-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
  
.hero-chip {
  position: relative;
  background: #ffffff;
  border-radius: 18px;
  padding: 10px 12px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  overflow: hidden;
}
  
.hero-chip::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 0 0, rgba(191, 219, 254, 0.9), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.hero-chip:hover::before {
  opacity: 1;
}
  
  .chip-label {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
  }
  
  .chip-value {
    display: block;
    margin-top: 4px;
    font-size: 13px;
    color: var(--text-secondary);
  }
  
  /* Generic sections */
.section {
  padding: 64px 0;
  position: relative;
}

.section-alt {
  background:
    radial-gradient(circle at 10% 0, rgba(219, 234, 254, 0.95), transparent 60%),
    radial-gradient(circle at 100% 50%, rgba(240, 249, 255, 0.95), transparent 55%),
    #ffffff;
}
  
  .section-header {
    margin-bottom: 32px;
  }
  
  .section-header h2 {
    font-size: 26px;
    margin: 0 0 6px;
  }
  
  .section-header p {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
  }
  
  .grid {
    display: grid;
    gap: 24px;
  }
  
  .two-columns {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }
  
  /* About */
  .about-grid > div:first-child p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
  }
  
  .about-highlights {
    display: grid;
    gap: 14px;
  }
  
.about-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 14px 16px;
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: var(--shadow-soft);
}
  
  .about-card h3 {
    font-size: 14px;
    margin: 0 0 4px;
  }
  
  .about-card p {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
  }
  
  /* Services */
  .services-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
  
.service-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  border: 1px solid rgba(226, 232, 240, 0.9);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}
  
.service-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 0 0, rgba(219, 234, 254, 1), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.service-card:hover::before {
  opacity: 1;
}
  
.service-card .service-tag {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(219, 234, 254, 1);
  color: #1d4ed8;
  margin-bottom: 8px;
}
  
  .service-card h3 {
    font-size: 16px;
    margin: 0 0 6px;
  }
  
.service-highlight {
  margin: 0 0 8px;
  font-size: 13px;
  color: #1d4ed8;
}
  
  .service-card p {
    font-size: 13px;
    margin: 0 0 10px;
    color: var(--text-secondary);
  }
  
  .service-list {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
  }
  
  .service-list li::before {
    content: "•";
    display: inline-block;
    margin-right: 6px;
    color: var(--accent);
  }
  
  /* Vision */
  .vision-grid > div:first-child p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
  }
  
  .vision-metrics {
    display: grid;
    gap: 12px;
  }
  
.metric-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 14px 16px;
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: var(--shadow-soft);
}
  
  .metric-label {
    display: block;
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 4px;
  }
  
  .metric-value {
    font-size: 13px;
    color: var(--text-secondary);
  }
  
  /* Contact */
  .contact-grid {
    align-items: flex-start;
  }
  
  .contact-info h3,
  .contact-form-card h3 {
    font-size: 16px;
    margin: 0 0 10px;
  }
  
.contact-email a {
  font-weight: 600;
  color: #1d4ed8;
}
  
  .contact-list {
    margin: 10px 0 10px;
    padding-left: 16px;
    font-size: 13px;
    color: var(--text-secondary);
  }
  
  .contact-note {
    font-size: 12px;
    color: var(--text-muted);
  }
  
.contact-form-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: var(--shadow-soft);
}
  
  .form-row {
    margin-bottom: 10px;
  }
  
  .form-row label {
    display: block;
    font-size: 13px;
    margin-bottom: 4px;
  }
  
input,
select,
textarea {
  width: 100%;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(209, 213, 219, 1);
  background: #ffffff;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.35);
  background: #f9fafb;
}
  
  textarea {
    resize: vertical;
    min-height: 96px;
  }
  
  .form-footer {
    margin-top: 12px;
  }
  
  .form-footer .btn-primary {
    width: 100%;
    justify-content: center;
  }
  
  .form-hint {
    margin: 6px 0 0;
    font-size: 11px;
    color: var(--text-muted);
  }
  
  .form-status {
    min-height: 16px;
    margin-top: 6px;
    font-size: 12px;
  }
  
  .form-status.success {
    color: var(--success);
  }
  
  .form-status.error {
    color: var(--danger);
  }
  
  /* Footer */
.site-footer {
  padding: 22px 0 26px;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  background: linear-gradient(to top, #f8fafc, transparent);
}
  
  .footer-inner {
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 12px;
    color: var(--text-secondary);
  }
  
  .footer-main {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: flex-start;
  }
  
  .footer-logo .logo-mark {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }
  
  .footer-logo .logo-text {
    font-size: 13px;
  }
  
  .footer-desc {
    margin: 6px 0 0;
    max-width: 420px;
  }
  
  .footer-meta p {
    margin: 0 0 2px;
  }
  
.footer-meta a {
  color: #1d4ed8;
  text-decoration: underline;
}
  
  /* Responsive */
  @media (max-width: 960px) {
    .hero-inner {
      grid-template-columns: minmax(0, 1fr);
    }
  
    .hero-visual {
      order: -1;
    }
  
    .two-columns {
      grid-template-columns: minmax(0, 1fr);
    }
  
    .services-grid {
      grid-template-columns: minmax(0, 1fr);
    }
  
    .footer-main {
      flex-direction: column;
    }
  }
  
@media (max-width: 768px) {
  .header-inner {
    height: 60px;
  }

  .nav {
    position: absolute;
    inset: 60px 12px auto 12px;
    background: #ffffff;
    border-radius: 16px;
    border: 1px solid rgba(148, 163, 184, 0.4);
    box-shadow: var(--shadow-soft);
    flex-direction: column;
    padding: 10px 12px;
    display: none;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 8px 10px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .hero {
    padding: 54px 0 54px;
  }

  .hero-content h1 {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 14px;
  }

  .hero-meta {
    grid-template-columns: minmax(0, 1fr);
  }

  .container {
    padding: 0 16px;
  }
}
  
  @media (max-width: 480px) {
    .hero-actions {
      flex-direction: column;
    }
  
    .hero-card {
      padding: 16px 14px 14px;
    }
  
    .hero-grid {
      grid-template-columns: minmax(0, 1fr);
    }
  
    .contact-form-card {
      padding: 14px;
    }
  }