/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #1a56db;
  --primary-dark: #1240a8;
  --primary-light: #e8eefb;
  --dark: #111827;
  --gray-900: #1f2937;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --gray-100: #f3f4f6;
  --white: #ffffff;
  --accent: #0ea5e9;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 14px rgba(0,0,0,.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.12);
  --radius: 12px;
  --transition: .3s ease;
}
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(--gray-700);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ===== Utilities ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-label {
  display: inline-block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 6px 18px;
  border-radius: 30px;
  margin-bottom: 16px;
  letter-spacing: .5px;
}
.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
  line-height: 1.3;
}
.section-desc {
  font-size: 1.1rem;
  color: var(--gray-500);
  max-width: 600px;
  margin: 0 auto 48px;
}
.text-center { text-align: center; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--white); transform: translateY(-2px); }

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,.06);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow-sm); }
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
}
.nav-logo .logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
}
.nav-links { display: flex; gap: 36px; }
.nav-links a {
  font-size: .95rem;
  font-weight: 500;
  color: var(--gray-700);
  position: relative;
  padding: 4px 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--dark); border-radius: 2px; transition: var(--transition); }

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(160deg, #f0f5ff 0%, #e0eaff 40%, #f8fbff 100%);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(26,86,219,.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px; left: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(14,165,233,.06) 0%, transparent 70%);
  border-radius: 50%;
}
.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-content h1 {
  font-size: 3.25rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-content h1 span { color: var(--primary); }
.hero-content p {
  font-size: 1.15rem;
  color: var(--gray-500);
  margin-bottom: 36px;
  max-width: 480px;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-graphic {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
  position: relative;
}
.hero-graphic .orbit {
  position: absolute;
  border: 2px dashed rgba(26,86,219,.15);
  border-radius: 50%;
  animation: spin 30s linear infinite;
}
.hero-graphic .orbit:nth-child(1) { inset: 5%; }
.hero-graphic .orbit:nth-child(2) { inset: 18%; animation-duration: 25s; animation-direction: reverse; }
.hero-graphic .orbit:nth-child(3) { inset: 32%; animation-duration: 20s; }
.hero-graphic .center-icon {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  width: 90px; height: 90px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 2rem;
  font-weight: 800;
  box-shadow: 0 8px 32px rgba(26,86,219,.3);
}
.hero-graphic .node {
  position: absolute;
  width: 56px; height: 56px;
  background: var(--white);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  font-size: 1.5rem;
}
.hero-graphic .node:nth-child(5) { top: 2%; left: 45%; }
.hero-graphic .node:nth-child(6) { top: 30%; right: 2%; }
.hero-graphic .node:nth-child(7) { bottom: 10%; right: 10%; }
.hero-graphic .node:nth-child(8) { bottom: 15%; left: 5%; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* ===== Stats ===== */
.stats {
  padding: 60px 0;
  background: var(--dark);
  color: var(--white);
}
.stats .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat-item h3 { font-size: 2.5rem; font-weight: 800; color: var(--accent); margin-bottom: 4px; }
.stat-item p { font-size: .95rem; color: var(--gray-300); }

/* ===== Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.service-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 40px 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 0;
  background: var(--primary);
  transition: height var(--transition);
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.service-card:hover::before { height: 100%; }
.service-icon {
  width: 56px; height: 56px;
  background: var(--primary-light);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}
.service-card h3 { font-size: 1.3rem; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.service-card p { color: var(--gray-500); font-size: .95rem; line-height: 1.7; }

/* ===== About Preview ===== */
.about-preview {
  background: var(--gray-100);
}
.about-preview .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-image {
  position: relative;
}
.about-image-box {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 4rem;
  font-weight: 800;
  opacity: .9;
}
.about-image .float-badge {
  position: absolute;
  bottom: -20px; right: -20px;
  background: var(--white);
  border-radius: var(--radius);
  padding: 20px 28px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.about-image .float-badge h4 { font-size: 1.6rem; font-weight: 800; color: var(--primary); }
.about-image .float-badge p { font-size: .85rem; color: var(--gray-500); }
.about-content h2 { font-size: 2.25rem; font-weight: 700; color: var(--dark); margin-bottom: 20px; line-height: 1.3; }
.about-content > p { color: var(--gray-500); margin-bottom: 24px; font-size: 1.05rem; }
.about-features { display: flex; flex-direction: column; gap: 16px; margin-bottom: 32px; }
.about-feature {
  display: flex; align-items: flex-start; gap: 12px;
}
.about-feature .check {
  width: 24px; height: 24px; min-width: 24px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--primary); font-size: .8rem; margin-top: 2px;
}
.about-feature span { font-size: .95rem; color: var(--gray-700); }

/* ===== CTA ===== */
.cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  text-align: center;
  padding: 80px 0;
}
.cta h2 { font-size: 2.25rem; font-weight: 700; margin-bottom: 16px; }
.cta p { font-size: 1.1rem; opacity: .85; margin-bottom: 32px; max-width: 520px; margin-left: auto; margin-right: auto; }
.cta .btn { background: var(--white); color: var(--primary); }
.cta .btn:hover { background: var(--gray-100); transform: translateY(-2px); }

/* ===== Footer ===== */
.footer {
  background: var(--dark);
  color: var(--gray-300);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer-brand .nav-logo { color: var(--white); margin-bottom: 16px; }
.footer-brand p { font-size: .9rem; line-height: 1.7; max-width: 280px; }
.footer h4 { color: var(--white); font-size: 1rem; margin-bottom: 20px; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { font-size: .9rem; color: var(--gray-300); }
.footer ul a:hover { color: var(--white); }
.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: .85rem;
  color: var(--gray-500);
}

/* ===== Page Header ===== */
.page-header {
  padding: 140px 0 80px;
  background: linear-gradient(160deg, #f0f5ff, #e0eaff, #f8fbff);
  text-align: center;
}
.page-header h1 { font-size: 2.75rem; font-weight: 800; color: var(--dark); margin-bottom: 12px; }
.page-header p { font-size: 1.15rem; color: var(--gray-500); max-width: 520px; margin: 0 auto; }

/* ===== About Page ===== */
.about-section .container { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-text h2 { font-size: 2rem; font-weight: 700; color: var(--dark); margin-bottom: 16px; }
.about-text p { color: var(--gray-500); margin-bottom: 16px; font-size: 1.02rem; }

.timeline { position: relative; padding-left: 32px; }
.timeline::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--gray-300); }
.timeline-item { margin-bottom: 32px; position: relative; }
.timeline-item::before {
  content: '';
  position: absolute; left: -36px; top: 6px;
  width: 10px; height: 10px;
  background: var(--primary); border-radius: 50%;
  border: 2px solid var(--white);
}
.timeline-item h4 { font-size: 1.05rem; font-weight: 700; color: var(--dark); }
.timeline-item span { font-size: .85rem; color: var(--primary); font-weight: 600; }
.timeline-item p { font-size: .9rem; color: var(--gray-500); margin-top: 4px; }

.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.team-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}
.team-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.team-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.8rem;
}
.team-card h4 { font-size: 1.1rem; font-weight: 700; color: var(--dark); }
.team-card p { font-size: .85rem; color: var(--gray-500); }

.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.value-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  transition: all var(--transition);
}
.value-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.value-icon {
  width: 64px; height: 64px;
  background: var(--primary-light);
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.8rem;
}
.value-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.value-card p { font-size: .9rem; color: var(--gray-500); }

/* ===== Services Page ===== */
.service-detail {
  border-bottom: 1px solid var(--gray-100);
}
.service-detail .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.service-detail.reverse .container { direction: rtl; }
.service-detail.reverse .container > * { direction: ltr; }
.service-detail-visual {
  background: linear-gradient(135deg, var(--primary-light), #dbeafe);
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem;
}
.service-detail-content h2 { font-size: 2rem; font-weight: 700; color: var(--dark); margin-bottom: 16px; }
.service-detail-content p { color: var(--gray-500); margin-bottom: 20px; }
.feature-list { display: flex; flex-direction: column; gap: 12px; }
.feature-list li {
  display: flex; align-items: center; gap: 10px;
  font-size: .95rem; color: var(--gray-700);
}
.feature-list li .dot {
  width: 8px; height: 8px; min-width: 8px;
  background: var(--primary); border-radius: 50%;
}

.tech-stack { background: var(--gray-100); }
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.tech-item {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
}
.tech-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.tech-item .icon { font-size: 2rem; margin-bottom: 8px; }
.tech-item p { font-size: .9rem; font-weight: 600; color: var(--dark); }

/* ===== Contact Page ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}
.contact-info h2 { font-size: 2rem; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.contact-info > p { color: var(--gray-500); margin-bottom: 32px; }
.info-list { display: flex; flex-direction: column; gap: 24px; }
.info-item { display: flex; align-items: flex-start; gap: 16px; }
.info-icon {
  width: 48px; height: 48px; min-width: 48px;
  background: var(--primary-light);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
}
.info-item h4 { font-size: .95rem; font-weight: 700; color: var(--dark); }
.info-item p { font-size: .9rem; color: var(--gray-500); }

.contact-form {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 40px;
}
.contact-form h3 { font-size: 1.3rem; font-weight: 700; color: var(--dark); margin-bottom: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: .9rem; font-weight: 600; color: var(--dark); margin-bottom: 6px; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-size: .95rem;
  color: var(--gray-700);
  background: var(--white);
  transition: border-color var(--transition);
  font-family: inherit;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,86,219,.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.map-section { background: var(--gray-100); }
.map-placeholder {
  width: 100%;
  height: 400px;
  background: var(--gray-100);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--gray-500);
  font-size: 1.1rem;
  border: 2px dashed var(--gray-300);
}

/* ===== Responsive ===== */
/* ===== Reveal Animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content p { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .hero-visual { display: none; }
  .stats .container { grid-template-columns: repeat(2, 1fr); }
  .about-preview .container { grid-template-columns: 1fr; }
  .about-section .container { grid-template-columns: 1fr; }
  .service-detail .container { grid-template-columns: 1fr; }
  .service-detail.reverse .container { direction: ltr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .hero-content h1 { font-size: 2.25rem; }
  .section-title { font-size: 1.75rem; }
  .page-header h1 { font-size: 2rem; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 72px; left: 0; right: 0;
    background: var(--white);
    padding: 24px;
    gap: 20px;
    box-shadow: var(--shadow-md);
  }
  .nav-toggle { display: flex; }
  .services-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .stats .container { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.8rem; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .stats .container { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
}