/* ===== 全局变量与基础样式 ===== */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --accent: #06b6d4;
  --bg-dark: #0a0e27;
  --bg-darker: #060818;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --text-muted: #9ca3af;
  --white: #ffffff;
  --bg-light: #f9fafb;
  --border: #e5e7eb;
  --gradient: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  --gradient-dark: linear-gradient(135deg, #0a0e27 0%, #1e1b4b 100%);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.7;
  background: var(--white);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

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

.section { padding: 100px 0; }
.section-sm { padding: 60px 0; }

.section-title {
  text-align: center;
  margin-bottom: 60px;
}
.section-title h2 {
  font-size: 40px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}
.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient);
  border-radius: 2px;
}
.section-title p {
  color: var(--text-light);
  font-size: 16px;
  margin-top: 24px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  gap: 8px;
}
.btn-primary {
  background: var(--gradient);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.45);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.4);
}
.btn-outline:hover {
  background: var(--white);
  color: var(--primary);
  border-color: var(--white);
}
.btn-light {
  background: var(--white);
  color: var(--primary);
  border: 1px solid var(--border);
}
.btn-light:hover {
  background: var(--bg-light);
  transform: translateY(-2px);
}

/* ===== 顶部导航 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 18px 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}
.header.scrolled {
  padding: 12px 0;
  box-shadow: var(--shadow-md);
  border-bottom-color: var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-dark);
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  font-weight: 800;
}
.nav-menu {
  display: flex;
  gap: 36px;
  align-items: center;
}
.nav-menu a {
  font-size: 15px;
  color: var(--text-dark);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}
.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  transition: var(--transition);
}
.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--primary);
}
.nav-cta {
  display: flex;
  gap: 12px;
  align-items: center;
}
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
}
.menu-toggle span {
  width: 26px;
  height: 2px;
  background: var(--text-dark);
  transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  background: var(--gradient-dark);
  position: relative;
  display: flex;
  align-items: center;
  color: var(--white);
  overflow: hidden;
  padding-top: 80px;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(37,99,235,0.3) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(6,182,212,0.25) 0%, transparent 40%);
  pointer-events: none;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}
.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.hero-text .tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 100px;
  font-size: 13px;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}
.hero-text .tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent);
}
.hero h1 {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -1px;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, #60a5fa, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-text p {
  font-size: 18px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  max-width: 520px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 60px;
  padding-top: 36px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.hero-stat .num {
  font-size: 32px;
  font-weight: 700;
  background: linear-gradient(135deg, #60a5fa, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-stat .label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

/* ===== Hero 视觉装饰 ===== */
.hero-visual {
  position: relative;
  height: 480px;
}
.hero-card {
  position: absolute;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
  animation: float 6s ease-in-out infinite;
}
.hero-card-1 {
  top: 0;
  left: 0;
  width: 260px;
}
.hero-card-2 {
  bottom: 40px;
  right: 0;
  width: 280px;
  animation-delay: -3s;
}
.hero-card-3 {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 220px;
  animation-delay: -1.5s;
}
.hero-card .ic {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 14px;
}
.hero-card h4 {
  font-size: 16px;
  margin-bottom: 6px;
}
.hero-card p {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  line-height: 1.5;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.hero-card-3 { animation-name: float-center; }
@keyframes float-center {
  0%, 100% { transform: translate(-50%, -50%); }
  50% { transform: translate(-50%, calc(-50% - 12px)); }
}

/* ===== 服务/特性卡片 ===== */
.features {
  background: var(--bg-light);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--white);
  padding: 36px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.feature-card:hover::before {
  transform: scaleX(1);
}
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(6,182,212,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
  color: var(--primary);
}
.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--text-light);
  font-size: 14.5px;
}
.feature-card .learn-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
}
.feature-card .learn-more:hover { gap: 10px; }

/* ===== 关于我们/数据展示 ===== */
.about-section {
  background: var(--white);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-img {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--gradient-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 120px;
  color: rgba(255,255,255,0.15);
}
.about-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(96,165,250,0.4) 0%, transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(34,211,238,0.3) 0%, transparent 50%);
}
.about-text .tag-line {
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.about-text h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.3;
}
.about-text p {
  color: var(--text-light);
  margin-bottom: 16px;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin: 30px 0;
}
.about-stat {
  padding: 20px;
  background: var(--bg-light);
  border-radius: 12px;
  border-left: 3px solid var(--primary);
}
.about-stat .num {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-dark);
}
.about-stat .label {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}

/* ===== 服务流程 ===== */
.process {
  background: var(--bg-darker);
  color: var(--white);
  position: relative;
}
.process::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 0%, rgba(37,99,235,0.2) 0%, transparent 50%);
}
.process .section-title h2 { color: var(--white); }
.process .section-title p { color: rgba(255,255,255,0.65); }
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
  z-index: 2;
}
.process-step {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}
.process-step:hover {
  background: rgba(255,255,255,0.07);
  transform: translateY(-6px);
  border-color: rgba(96,165,250,0.4);
}
.process-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
}
.process-step h3 {
  font-size: 18px;
  margin-bottom: 10px;
}
.process-step p {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
}

/* ===== 案例展示 ===== */
.cases-section { background: var(--bg-light); }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.case-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border);
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}
.case-img {
  aspect-ratio: 16/10;
  background: var(--gradient-dark);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.3);
  font-size: 64px;
  overflow: hidden;
}
.case-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(37,99,235,0.4) 0%, transparent 60%);
}
.case-body { padding: 24px; }
.case-cat {
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.case-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  font-weight: 600;
}
.case-card p {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 16px;
}
.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.case-tag {
  font-size: 12px;
  padding: 4px 10px;
  background: var(--bg-light);
  color: var(--text-light);
  border-radius: 100px;
}

/* ===== 客户评价 ===== */
.testimonials { background: var(--white); }
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  background: var(--bg-light);
  padding: 32px;
  border-radius: var(--radius);
  position: relative;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.testimonial-card:hover {
  transform: translateY(-4px);
  background: var(--white);
  box-shadow: var(--shadow-lg);
}
.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 12px;
  right: 20px;
  font-size: 80px;
  color: var(--primary);
  opacity: 0.15;
  font-family: serif;
  line-height: 1;
}
.testimonial-card p {
  color: var(--text-dark);
  margin-bottom: 20px;
  font-size: 14.5px;
  position: relative;
  z-index: 2;
}
.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 600;
}
.testimonial-user .name {
  font-weight: 600;
  font-size: 14px;
}
.testimonial-user .role {
  font-size: 12px;
  color: var(--text-light);
}

/* ===== 合作伙伴 ===== */
.partners { background: var(--bg-light); padding: 60px 0; }
.partners-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 30px;
  align-items: center;
}
.partner-logo {
  text-align: center;
  padding: 20px;
  background: var(--white);
  border-radius: var(--radius);
  font-weight: 600;
  color: var(--text-light);
  transition: var(--transition);
  border: 1px solid var(--border);
}
.partner-logo:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-3px);
}

/* ===== CTA 区 ===== */
.cta {
  background: var(--gradient-dark);
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(37,99,235,0.3) 0%, transparent 40%),
    radial-gradient(circle at 80% 50%, rgba(6,182,212,0.3) 0%, transparent 40%);
}
.cta-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
}
.cta h2 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 18px;
  line-height: 1.3;
}
.cta p {
  font-size: 17px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
}
.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 内页 Banner ===== */
.page-banner {
  padding: 160px 0 80px;
  background: var(--gradient-dark);
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 50%, rgba(37,99,235,0.3) 0%, transparent 50%);
}
.page-banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
}
.page-banner h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
}
.page-banner .breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.7);
  font-size: 14px;
}
.page-banner .breadcrumb a:hover { color: var(--white); }

/* ===== 联系页 ===== */
.contact-section { background: var(--white); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: start;
}
.contact-info h3 {
  font-size: 26px;
  margin-bottom: 16px;
}
.contact-info > p {
  color: var(--text-light);
  margin-bottom: 36px;
}
.contact-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.contact-item:last-child { border-bottom: 0; }
.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(6,182,212,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 20px;
  flex-shrink: 0;
}
.contact-item h4 {
  font-size: 15px;
  margin-bottom: 4px;
}
.contact-item p {
  color: var(--text-light);
  font-size: 14px;
}
.contact-form {
  background: var(--bg-light);
  padding: 40px;
  border-radius: var(--radius-lg);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--white);
  font-family: inherit;
  transition: var(--transition);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== 关于页 团队 ===== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.team-card {
  text-align: center;
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px 20px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.team-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.team-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--gradient);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 36px;
  font-weight: 600;
}
.team-card h3 { font-size: 18px; margin-bottom: 4px; }
.team-card .role { color: var(--primary); font-size: 13px; font-weight: 500; margin-bottom: 12px; }
.team-card p { font-size: 13px; color: var(--text-light); }

/* ===== 新闻列表 ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.news-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.news-img {
  background: var(--gradient-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: rgba(255,255,255,0.3);
}
.news-body { padding: 22px; }
.news-meta {
  display: flex;
  gap: 14px;
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 10px;
}
.news-meta .news-cat {
  color: var(--primary);
  font-weight: 600;
}
.news-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
  font-weight: 600;
  line-height: 1.4;
}
.news-card p {
  font-size: 13.5px;
  color: var(--text-light);
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card a.read-more {
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-darker);
  color: rgba(255,255,255,0.7);
  padding: 80px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}
.footer-brand .logo { color: var(--white); margin-bottom: 16px; }
.footer-brand p {
  font-size: 14px;
  margin-bottom: 20px;
}
.social-links {
  display: flex;
  gap: 10px;
}
.social-links a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.social-links a:hover {
  background: var(--primary);
  transform: translateY(-3px);
}
.footer-col h4 {
  color: var(--white);
  font-size: 16px;
  margin-bottom: 20px;
  font-weight: 600;
}
.footer-col ul li {
  margin-bottom: 12px;
}
.footer-col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
}
.footer-col ul li a:hover {
  color: var(--white);
  padding-left: 4px;
}
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  flex-wrap: wrap;
  gap: 16px;
}

/* ===== 动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s, transform 0.8s;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 44px; }
}

@media (max-width: 768px) {
  .section { padding: 70px 0; }
  .nav-menu, .nav-cta .btn { display: none; }
  .menu-toggle { display: flex; }
  .nav-menu.active {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 20px;
    gap: 0;
    box-shadow: var(--shadow-md);
  }
  .nav-menu.active a { padding: 14px 0; border-bottom: 1px solid var(--border); width: 100%; }

  .hero { padding-top: 100px; }
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 36px; }
  .hero-text p { font-size: 16px; }
  .hero-visual { height: 360px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }

  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .features-grid, .cases-grid, .news-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section-title h2 { font-size: 30px; }
  .cta h2 { font-size: 30px; }
  .news-card { grid-template-columns: 1fr; }
  .news-img { aspect-ratio: 16/9; }
  .page-banner h1 { font-size: 34px; }
}