:root {
  --navy: #0c1b33;
  --blue: #1d5bf5;
  --accent: #3b82f6;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--gray-900);
  line-height: 1.6;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* NAV */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-100);
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none;
}
.logo img {
  height: 36px; width: auto;
}
.logo h1 {
  font-size: 18px; font-weight: 700; color: var(--navy);
  letter-spacing: -0.2px; margin: 0;
}
.logo h1 span { color: var(--blue); }
.nav-links {
  display: flex; list-style: none; gap: 4px;
}
.nav-links a {
  color: var(--gray-500); text-decoration: none;
  font-size: 14px; font-weight: 500; transition: all 0.2s;
  padding: 7px 14px; border-radius: 6px;
}
.nav-links a:hover { color: var(--navy); background: var(--gray-50); }
.nav-links a.active { color: var(--blue); background: rgba(29,91,245,0.05); }
.mobile-menu {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  border: 0; background: transparent; padding: 0;
}
.mobile-menu span { width: 22px; height: 2px; background: var(--navy); border-radius: 2px; }

/* HERO */
.hero {
  margin-top: 68px;
  background: var(--white);
  padding: 100px 0 90px;
  text-align: center;
  border-bottom: 1px solid var(--gray-100);
}
.hero .hero-logo {
  width: 180px; margin: 0 auto 40px;
}
.hero h2 {
  font-size: 44px; font-weight: 800; color: var(--navy);
  margin-bottom: 12px;
  letter-spacing: -1px; line-height: 1.2;
}
.hero .hero-subtitle {
  font-size: 13px; color: var(--blue);
  letter-spacing: 3px; text-transform: uppercase;
  margin-bottom: 16px; font-weight: 600;
}
.hero .hero-tagline {
  font-size: 18px; color: var(--gray-500);
  margin-bottom: 40px;
  max-width: 560px; margin-left: auto; margin-right: auto;
}
.hero-buttons {
  display: flex; gap: 14px; justify-content: center;
}

/* BUTTONS */
.btn {
  display: inline-block; padding: 13px 32px;
  border-radius: 8px; font-size: 15px; font-weight: 600;
  text-decoration: none; transition: all 0.2s; cursor: pointer;
  border: none;
}
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: #1a4fd4; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(29,91,245,0.3); }
.btn-secondary {
  background: var(--white); color: var(--navy);
  border: 1px solid var(--gray-200);
}
.btn-secondary:hover { border-color: var(--gray-400); }

/* SECTION */
.section { padding: 80px 0; }
.section-alt { background: var(--gray-50); }
.section-title {
  font-size: 32px; font-weight: 800; text-align: center;
  margin-bottom: 10px; color: var(--navy);
  letter-spacing: -0.5px;
}
.section-subtitle {
  text-align: center; color: var(--gray-500);
  font-size: 16px; margin-bottom: 56px;
}

/* FEATURE CARDS */
.feature-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: 12px; padding: 32px 24px;
  text-align: center;
  transition: all 0.25s;
}
.feature-card:hover {
  border-color: var(--gray-200);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.04);
}
.feature-icon { font-size: 32px; margin-bottom: 16px; }
.feature-card h3 {
  font-size: 16px; font-weight: 700;
  margin-bottom: 10px; color: var(--navy);
}
.feature-card p { font-size: 14px; color: var(--gray-500); line-height: 1.7; }

/* SERVICE CARDS */
.service-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.service-card {
  background: var(--white);
  border-radius: 12px; padding: 32px 24px;
  border-top: 3px solid var(--blue);
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
  transition: all 0.25s;
}
.service-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.06); }
.service-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 10px; color: var(--navy); }
.service-card p { font-size: 14px; color: var(--gray-500); line-height: 1.7; }

/* CASE CARDS */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.case-card {
  background: var(--navy);
  border-radius: 12px; padding: 32px 24px;
  color: var(--white);
  transition: all 0.25s;
}
.case-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(12,27,51,0.2); }
.case-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.case-card p { font-size: 14px; color: rgba(255,255,255,0.6); margin-bottom: 16px; line-height: 1.7; }
.case-stat {
  display: inline-block;
  background: var(--blue); color: var(--white);
  padding: 5px 14px; border-radius: 16px;
  font-size: 12px; font-weight: 600;
}

/* CTA */
.cta-banner {
  background: var(--blue);
  padding: 64px 0; text-align: center;
}
.cta-banner h2 { font-size: 28px; font-weight: 800; color: var(--white); margin-bottom: 10px; }
.cta-banner p { color: rgba(255,255,255,0.95); font-size: 16px; margin-bottom: 28px; }
.cta-banner .btn-primary { background: var(--white); color: var(--blue); }
.cta-banner .btn-primary:hover { background: var(--gray-50); }

/* PAGE HEADER */
.page-header {
  margin-top: 68px;
  background: var(--gray-50);
  padding: 64px 0 56px; text-align: center;
  border-bottom: 1px solid var(--gray-100);
}
.page-header h1 { font-size: 36px; font-weight: 800; color: var(--navy); margin-bottom: 6px; letter-spacing: -0.5px; }
.page-header p { color: var(--blue); font-size: 14px; letter-spacing: 2px; text-transform: uppercase; font-weight: 600; }

/* ABOUT */
.about-content { padding: 72px 0; }
.about-text { margin-bottom: 48px; }
.about-text h2 { font-size: 26px; font-weight: 800; margin-bottom: 16px; color: var(--navy); }
.about-text p { font-size: 15px; color: var(--gray-500); margin-bottom: 12px; line-height: 1.8; }
.about-text ul { list-style: none; margin-top: 16px; }
.about-text li {
  padding: 12px 0 12px 24px; position: relative;
  font-size: 15px; color: var(--gray-700);
}
.about-text li::before {
  content: ''; position: absolute; left: 0; top: 18px;
  width: 8px; height: 8px; background: var(--blue);
  border-radius: 50%;
}
.about-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 18px; margin-bottom: 48px;
}
.stat-card {
  background: var(--gray-50); border-radius: 12px;
  padding: 32px 20px; text-align: center;
  transition: all 0.25s;
  border: 1px solid var(--gray-100);
}
.stat-card:hover { background: var(--blue); border-color: var(--blue); }
.stat-card:hover h3, .stat-card:hover p { color: var(--white); }
.stat-card h3 { font-size: 36px; font-weight: 800; color: var(--navy); margin-bottom: 6px; transition: color 0.25s; letter-spacing: -1px; }
.stat-card p { font-size: 13px; color: var(--gray-500); transition: color 0.25s; }
.about-values h2 { font-size: 26px; font-weight: 800; margin-bottom: 24px; color: var(--navy); }
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.value-card {
  background: var(--white); border: 1px solid var(--gray-100);
  border-radius: 12px; padding: 24px; text-align: center;
}
.value-card h3 { font-size: 16px; font-weight: 700; color: var(--navy); }
.value-card p { font-size: 13px; color: var(--gray-500); margin-top: 6px; }

/* SERVICES DETAIL */
.services-content { padding: 72px 0; }
.service-detail { max-width: 820px; margin: 0 auto; }
.service-item {
  display: flex; gap: 24px; align-items: flex-start;
  padding: 32px 0;
  border-bottom: 1px solid var(--gray-100);
}
.service-item:last-child { border-bottom: none; }
.service-icon-large { font-size: 40px; flex-shrink: 0; padding-top: 2px; }
.service-info h2 { font-size: 22px; font-weight: 800; margin-bottom: 6px; color: var(--navy); }
.service-info p { font-size: 15px; color: var(--gray-500); margin-bottom: 12px; }
.service-info ul { list-style: none; }
.service-info li {
  padding: 6px 0 6px 20px; position: relative;
  font-size: 14px; color: var(--gray-700);
}
.service-info li::before {
  content: ''; position: absolute; left: 0; top: 14px;
  width: 6px; height: 6px; background: var(--blue);
  border-radius: 50%;
}

/* CONTACT */
.contact-content { padding: 72px 0; }
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 48px; align-items: start;
}
.contact-info h2 { font-size: 26px; font-weight: 800; margin-bottom: 28px; color: var(--navy); }
.contact-item { padding: 20px 0; border-bottom: 1px solid var(--gray-100); }
.contact-item h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; color: var(--navy); }
.contact-item p { font-size: 15px; color: var(--gray-500); margin-bottom: 4px; }
.contact-form {
  background: var(--gray-50); border-radius: 12px; padding: 32px;
  border: 1px solid var(--gray-100);
}
.contact-form h2 { font-size: 22px; font-weight: 800; margin-bottom: 24px; color: var(--navy); }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block; font-size: 13px; font-weight: 600;
  margin-bottom: 6px; color: var(--gray-700);
}
.form-group input, .form-group textarea {
  width: 100%; padding: 11px 14px;
  border: 1px solid var(--gray-200); border-radius: 8px;
  font-size: 14px; font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: var(--white);
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(29,91,245,0.08);
}
.form-group textarea { resize: vertical; min-height: 100px; }

/* FOOTER */
.footer {
  background: var(--navy); padding: 48px 0 20px;
  color: rgba(255,255,255,0.55);
}
.footer-content {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 32px; margin-bottom: 32px;
}
.footer h3 { font-size: 14px; font-weight: 700; color: var(--white); margin-bottom: 12px; }
.footer p { font-size: 13px; margin-bottom: 6px; line-height: 1.7; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px; text-align: center;
}
.footer-bottom p { font-size: 12px; }

/* ANIMATION */
.animate-on-scroll {
  opacity: 0; transform: translateY(20px);
  transition: all 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1; transform: translateY(0);
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 4px;
    padding: 16px 24px;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: 0 12px 24px rgba(0,0,0,0.06);
  }
  .nav-links.active { display: flex; }
  .nav-links a { padding: 10px 14px; }
  .mobile-menu { display: flex; }
  .hero h2 { font-size: 28px; }
  .hero .hero-subtitle { font-size: 11px; letter-spacing: 2px; }
  .hero .hero-tagline { font-size: 15px; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .feature-grid, .service-grid { grid-template-columns: 1fr 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .value-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-content { grid-template-columns: 1fr; }
  .section-title { font-size: 26px; }
}