:root {
  --color-primary: #1e3a5f;
  --color-primary-light: #e8eef5;
  --color-primary-dark: #142842;
  --color-accent: #e07a2f;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-light: #9ca3af;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-border: #e5e7eb;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.03);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.08);
  --transition: .25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== Navbar ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.navbar.scrolled { box-shadow: var(--shadow-md); }

.navbar-inner {
  display: flex;
  align-items: center;
  height: 64px;
  gap: 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
}

.logo-img {
  width: 32px;
  height: 32px;
}

.logo-text { letter-spacing: -.5px; }

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
  flex: 1;
}

.nav-links a {
  display: block;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.nav-links a:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color: #fff; }

.btn-ghost {
  background: rgba(255,255,255,.15);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,.3);
}
.btn-ghost:hover { background: rgba(255,255,255,.25); }

.btn-lg { padding: 12px 28px; font-size: 15px; border-radius: var(--radius); }

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  overflow: hidden;
  background: var(--color-bg-dark);
  color: #fff;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(26,86,219,.25) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(232,89,12,.12) 0%, transparent 60%),
    linear-gradient(180deg, var(--color-bg-dark) 0%, #1e293b 100%);
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 80px 0 60px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  margin-bottom: 20px;
}

.highlight {
  background: linear-gradient(135deg, var(--color-primary) 0%, #6366f1 50%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,.7);
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 64px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,.1);
}

.stat-num {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -.02em;
  background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,.5);
  margin-top: 4px;
}

/* ========== Sections ========== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

/* ========== Services ========== */
.services { background: var(--color-bg-alt); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 32px 28px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.service-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 12px;
  margin-bottom: 20px;
}

.service-icon svg { width: 24px; height: 24px; }

.service-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.service-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ========== Advantages ========== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.advantage-item {
  display: flex;
  gap: 20px;
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.advantage-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.advantage-num {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-dark);
  color: #fff;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 800;
}

.advantage-item h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.advantage-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ========== About ========== */
.about { background: var(--color-bg-alt); }

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-lead {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.about-text p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.tag {
  padding: 6px 16px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
}

.about-visual {
  display: flex;
  justify-content: center;
}

.visual-card {
  width: 280px;
  height: 320px;
  background: var(--color-bg-dark);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.visual-card::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(26,86,219,.4) 0%, transparent 70%);
  top: -40px;
  right: -40px;
}

.visual-icon svg {
  width: 80px;
  height: 80px;
  color: rgba(255,255,255,.8);
}

.visual-card span {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
}

/* ========== Contact ========== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.contact-card {
  text-align: center;
  padding: 40px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 14px;
  margin: 0 auto 16px;
}

.contact-icon svg { width: 24px; height: 24px; }

.contact-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.contact-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* ========== Footer ========== */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,.6);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  font-size: 16px;
}

.footer-brand .footer-logo-img {
  width: 28px;
  height: 28px;
}

.footer-copy { font-size: 13px; }
.footer-copy a { color: inherit; text-decoration: none; }
.footer-copy a:hover { text-decoration: underline; }

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-content { grid-template-columns: 1fr; gap: 40px; }
  .about-visual { display: none; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .navbar-inner .btn { display: none; }
  .mobile-menu-btn { display: flex; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .hero-title { font-size: 32px; }
  .hero-desc { font-size: 16px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .stat-num { font-size: 24px; }

  .services-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }

  .section { padding: 64px 0; }
  .section-title { font-size: 26px; }

  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
}