/* ===== 设计令牌 ===== */
:root {
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-display: 'Noto Serif SC', 'SimSun', serif;
  --color-primary: #0077cc;
  --color-primary-hover: #005fa3;
  --color-primary-light: #e8f4fd;
  --color-accent: #00b3c4;
  --color-text: #1a1f2e;
  --color-text-muted: #5a6072;
  --color-text-faint: #9ba2b4;
  --color-bg: #f7f9fc;
  --color-surface: #ffffff;
  --color-surface-offset: #f0f4f8;
  --color-border: rgba(30, 50, 90, 0.10);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.05);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.06);
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { display: block; max-width: 100%; height: auto; }
a { text-decoration: none; color: inherit; transition: color var(--transition); }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ===== 导航栏 ===== */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}
#nav[data-fixed="fixed"] { box-shadow: var(--shadow-md); }

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

#nav-logo img {
  height: 44px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0; padding: 0;
}
.nav-menu li a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: background var(--transition), color var(--transition);
}
.nav-menu li a:hover,
.nav-menu li a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px var(--space-6);
  background: var(--color-primary);
  color: #fff !important;
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 14px rgba(0,119,204,0.3);
}

.nav-hamburger {
  display: none;
  width: 44px; height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: var(--radius-md);
  background: none;
  border: none;
}
.nav-hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  position: relative;
  transition: background var(--transition);
}
.nav-hamburger span::before,
.nav-hamburger span::after {
  content: '';
  position: absolute;
  left: 0; width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition);
}
.nav-hamburger span::before { top: -7px; }
.nav-hamburger span::after { top: 7px; }

/* 移动端导航 */
.mobile-menu {
  display: none;
  position: absolute;
  top: 68px; left: 0; right: 0;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4);
  box-shadow: var(--shadow-md);
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: 12px var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text);
  border-radius: var(--radius-md);
  border-bottom: 1px solid var(--color-border);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { background: var(--color-primary-light); color: var(--color-primary); }

/* ===== Hero ===== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0a1628 0%, #0d2750 40%, #0a3d62 70%, #0f4c75 100%);
  padding-top: 68px;
}
.hero-bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(0,179,196,0.15) 0%, transparent 60%),
    radial-gradient(ellipse 40% 60% at 10% 80%, rgba(0,119,204,0.12) 0%, transparent 60%);
  pointer-events: none;
}
.hero-grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-16) var(--space-6);
  max-width: 900px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px var(--space-4);
  background: rgba(0,179,196,0.15);
  border: 1px solid rgba(0,179,196,0.3);
  border-radius: var(--radius-full, 9999px);
  font-size: var(--text-xs);
  color: #7dd3dc;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-6);
  font-weight: 500;
}
.hero-badge::before {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  background: #00b3c4;
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: #fff;
  line-height: 1.2;
  margin-bottom: var(--space-6);
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.hero-title span {
  color: #00d4e8;
}
.hero-subtitle {
  font-size: var(--text-lg);
  color: rgba(255,255,255,0.75);
  line-height: 1.6;
  margin-bottom: var(--space-10);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.hero-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-16);
}
.btn-primary-hero {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 14px var(--space-8);
  background: var(--color-primary);
  color: #fff;
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  box-shadow: 0 4px 20px rgba(0,119,204,0.4);
}
.btn-primary-hero:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 8px 30px rgba(0,119,204,0.5);
  transform: translateY(-1px);
  color: #fff;
}
.btn-outline-hero {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 14px var(--space-8);
  background: transparent;
  color: rgba(255,255,255,0.9);
  font-size: var(--text-base);
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.3);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}
.btn-outline-hero:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.55);
  color: #fff;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  max-width: 800px;
  margin: 0 auto;
}
.hero-stat {
  text-align: center;
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
}
.hero-stat-number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: #00d4e8;
  line-height: 1;
  margin-bottom: 4px;
}
.hero-stat-label {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.55);
}

/* ===== 通用节标题 ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}
.section-tag {
  display: inline-block;
  padding: 4px var(--space-4);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full, 9999px);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.25;
  margin-bottom: var(--space-4);
}
.section-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 560px;
  margin: 0 auto;
}

/* ===== 服务板块 ===== */
.services-section {
  padding: clamp(var(--space-12), 7vw, var(--space-20)) 0;
  background: #fff;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-6);
}
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  cursor: default;
}
.service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: rgba(0,119,204,0.2);
}
.service-card-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  background: var(--color-surface-offset);
}
.service-card-body {
  padding: var(--space-4);
}
.service-card-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}
.service-card-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.service-more-card {
  background: var(--color-primary-light);
  border: 1px dashed rgba(0,119,204,0.3);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  text-align: center;
  gap: var(--space-3);
  min-height: 180px;
  transition: background var(--transition);
}
.service-more-card:hover { background: #dbeeff; }
.service-more-card svg { color: var(--color-primary); opacity: 0.7; }
.service-more-card p {
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 500;
  line-height: 1.5;
}

/* ===== 优势板块 ===== */
.advantage-section {
  padding: clamp(var(--space-12), 7vw, var(--space-20)) 0;
  background: var(--color-bg);
}
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}
.advantage-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
  transition: box-shadow var(--transition), transform var(--transition);
}
.advantage-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.advantage-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.advantage-icon img {
  width: 28px; height: 28px;
}
.advantage-content h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.advantage-content p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== 数据看板 ===== */
.stats-section {
  padding: clamp(var(--space-12), 7vw, var(--space-20)) 0;
  background: linear-gradient(135deg, #0d2750 0%, #0a3d62 100%);
  position: relative;
  overflow: hidden;
}
.stats-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(ellipse 60% 80% at 100% 50%, rgba(0,212,232,0.08) 0%, transparent 60%),
    radial-gradient(ellipse 50% 70% at 0% 50%, rgba(0,119,204,0.10) 0%, transparent 60%);
  pointer-events: none;
}
.stats-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}
.stat-item {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
}
.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: #00d4e8;
  line-height: 1;
  margin-bottom: var(--space-3);
}
.stat-label {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.65);
  line-height: 1.4;
}

/* ===== 流程板块 ===== */
.process-section {
  padding: clamp(var(--space-12), 7vw, var(--space-20)) 0;
  background: #fff;
}
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  position: relative;
}
.process-steps::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 12%;
  right: 12%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  z-index: 0;
}
.process-step {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), border-color var(--transition);
}
.process-step:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(0,119,204,0.25);
}
.step-number {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: var(--text-base);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  box-shadow: 0 4px 14px rgba(0,119,204,0.35);
}
.process-step h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.process-step p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== 试用召唤 ===== */
.cta-section {
  padding: clamp(var(--space-12), 8vw, var(--space-20)) 0;
  background: var(--color-primary);
  position: relative;
  overflow: hidden;
  text-align: center;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 80% 20%, rgba(255,255,255,0.06) 0%, transparent 60%);
  pointer-events: none;
}
.cta-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: #fff;
  margin-bottom: var(--space-4);
  position: relative;
}
.cta-section p {
  font-size: var(--text-base);
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--space-8);
  position: relative;
}
.btn-cta-white {
  display: inline-block;
  padding: 14px var(--space-10);
  background: #fff;
  color: var(--color-primary);
  font-size: var(--text-base);
  font-weight: 700;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition);
  position: relative;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.btn-cta-white:hover {
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
  transform: translateY(-2px);
  color: var(--color-primary-hover);
}

/* ===== 合作伙伴 ===== */
.partners-section {
  padding: clamp(var(--space-10), 6vw, var(--space-16)) 0;
  background: var(--color-bg);
}
.partners-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}
.partner-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  height: 72px;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.partner-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: rgba(0,119,204,0.2);
}
.partner-item img {
  max-height: 40px;
  max-width: 100%;
  object-fit: contain;
  filter: grayscale(0.3);
  transition: filter var(--transition);
}
.partner-item:hover img { filter: grayscale(0); }

.partners-bottom {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.partners-bottom-text h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.partners-bottom-text p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.btn-primary {
  display: inline-block;
  padding: 12px var(--space-8);
  background: var(--color-primary);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), box-shadow var(--transition);
  box-shadow: 0 2px 10px rgba(0,119,204,0.25);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 18px rgba(0,119,204,0.4);
  color: #fff;
}

/* ===== 页脚 ===== */
footer {
  background: #0a1628;
  color: rgba(255,255,255,0.65);
  padding: var(--space-12) 0 var(--space-8);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-10);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-top: var(--space-4);
  max-width: 300px;
}
.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  margin-bottom: var(--space-4);
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: var(--space-3); }
.footer-col a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}
.footer-col a:hover { color: rgba(255,255,255,0.9); }
.footer-contact p {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.35);
}
.footer-icp a { color: rgba(255,255,255,0.35); transition: color var(--transition); }
.footer-icp a:hover { color: rgba(255,255,255,0.7); }

/* ===== 侧边浮动联系 ===== */
.contact-float {
  position: fixed;
  right: 24px;
  bottom: 100px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.float-btn {
  width: 50px; height: 50px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,119,204,0.35);
  border: none;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  font-size: 20px;
  text-decoration: none;
  position: relative;
}
.float-btn:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 6px 20px rgba(0,119,204,0.5);
  transform: translateY(-2px);
  color: #fff;
}
.float-btn-tip {
  position: absolute;
  right: 58px;
  white-space: nowrap;
  background: rgba(10,22,40,0.88);
  color: #fff;
  font-size: 12px;
  padding: 5px 10px;
  border-radius: 6px;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition);
}
.float-btn:hover .float-btn-tip { opacity: 1; }
.back-to-top {
  width: 44px; height: 44px;
  background: rgba(255,255,255,0.9);
  color: var(--color-primary);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.back-to-top:hover {
  background: #fff;
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* ===== 咨询弹框 ===== */
.cs-alert-box {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.5);
  align-items: center;
  justify-content: center;
}
.cs-alert-box.active { display: flex; }
.cs-content {
  background: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  width: 100%;
  max-width: 460px;
  margin: var(--space-4);
  box-shadow: var(--shadow-lg);
  position: relative;
}
.cs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.cs-header h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}
.cs-close {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  border: none;
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  transition: background var(--transition), color var(--transition);
}
.cs-close:hover { background: #fee; color: #c00; }
.cs-item {
  margin-bottom: var(--space-4);
}
.cs-item input {
  width: 100%;
  padding: 11px var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
  font-family: var(--font-body);
  transition: border-color var(--transition), box-shadow var(--transition);
  background: #fff;
}
.cs-item input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,119,204,0.12);
}
.cs-item input::placeholder { color: var(--color-text-faint); }
.cs-item button[type="submit"] {
  width: 100%;
  padding: 13px;
  background: var(--color-primary);
  color: #fff;
  font-size: var(--text-base);
  font-weight: 700;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
  font-family: var(--font-body);
  box-shadow: 0 3px 12px rgba(0,119,204,0.3);
}
.cs-item button[type="submit"]:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 6px 20px rgba(0,119,204,0.4);
}
.cs-privacy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
  margin-top: var(--space-3);
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .nav-menu, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .process-steps::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: clamp(1.6rem, 6vw, 2.5rem); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-bottom { flex-direction: column; text-align: center; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .contact-float { right: 12px; bottom: 80px; }
}