/* ============================================
   乐云SEO - 霓虹未来科技风 v3.0
   高对比度 | 霓虹发光 | 3D效果 | 粒子背景
   ============================================ */

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

:root {
  --bg-primary: #050810;
  --bg-secondary: #0a0f1e;
  --bg-card: rgba(13, 20, 40, 0.85);
  --bg-card-hover: rgba(20, 30, 55, 0.95);
  --neon-blue: #00d4ff;
  --neon-cyan: #00ffcc;
  --neon-purple: #a855f7;
  --neon-pink: #ec4899;
  --neon-green: #22ff88;
  --text-primary: #ffffff;
  --text-secondary: #b8c5d6;
  --text-muted: #6b7a90;
  --border-neon: rgba(0, 212, 255, 0.3);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --glow-blue: 0 0 20px rgba(0, 212, 255, 0.5), 0 0 40px rgba(0, 212, 255, 0.2);
  --glow-cyan: 0 0 20px rgba(0, 255, 204, 0.5), 0 0 40px rgba(0, 255, 204, 0.2);
  --glow-purple: 0 0 20px rgba(168, 85, 247, 0.5), 0 0 40px rgba(168, 85, 247, 0.2);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
}

/* 粒子背景画布 */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* 全局背景层 */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse 60% 40% at 15% 10%, rgba(0, 212, 255, 0.08), transparent),
    radial-gradient(ellipse 50% 35% at 85% 20%, rgba(168, 85, 247, 0.08), transparent),
    radial-gradient(ellipse 70% 50% at 50% 100%, rgba(0, 255, 204, 0.05), transparent);
  pointer-events: none;
  z-index: 0;
}

/* 网格背景 */
.grid-bg {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ============================================
   顶部导航
   ============================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  background: transparent;
}
.navbar.scrolled {
  background: rgba(5, 8, 16, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-neon);
  box-shadow: 0 4px 30px rgba(0, 212, 255, 0.1);
  padding: 12px 0;
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.nav-logo-icon {
  width: 40px; height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: rgba(5, 8, 16, 0.9);
  border: 1px solid rgba(0, 212, 255, 0.3);
  overflow: hidden;
  flex-shrink: 0;
}
.nav-logo-icon::before {
  content: '';
  position: absolute;
  inset: -50%;
  background: conic-gradient(from 0deg, transparent, #00d4ff, transparent 30%, transparent, #a855f7, transparent 60%, transparent, #00ffcc, transparent 90%);
  animation: logoBorderSpin 4s linear infinite;
  z-index: 0;
}
.nav-logo-icon::after {
  content: '';
  position: absolute;
  inset: 2px;
  background: rgba(5, 8, 16, 0.95);
  border-radius: 10px;
  z-index: 1;
}
@keyframes logoBorderSpin {
  to { transform: rotate(360deg); }
}
.logo-search-icon {
  width: 18px; height: 18px;
  position: relative;
  z-index: 2;
}
.logo-search-icon::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 12px; height: 12px;
  border: 2.5px solid #00d4ff;
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.6), inset 0 0 6px rgba(0, 212, 255, 0.2);
}
.logo-search-icon::after {
  content: '';
  position: absolute;
  bottom: 1px; right: 0;
  width: 7px; height: 2.5px;
  background: linear-gradient(90deg, #00d4ff, #00ffcc);
  transform: rotate(45deg);
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}
.nav-logo-text {
  font-size: 21px;
  font-weight: 900;
  color: #fff;
  letter-spacing: 1px;
  text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
  animation: logoTextGlow 3s ease-in-out infinite;
}
@keyframes logoTextGlow {
  0%, 100% { text-shadow: 0 0 20px rgba(0, 212, 255, 0.3); }
  50% { text-shadow: 0 0 30px rgba(0, 212, 255, 0.5), 0 0 40px rgba(168, 85, 247, 0.3); }
}
.nav-logo-text span {
  background: linear-gradient(135deg, #00d4ff, #00ffcc, #a855f7);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.4));
  animation: logoGradientShift 3s ease infinite;
}
@keyframes logoGradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.3s ease;
  position: relative;
}
.nav-links a:hover {
  color: var(--neon-blue);
  background: rgba(0, 212, 255, 0.08);
  text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}
.nav-cta {
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #fff !important;
  padding: 10px 22px !important;
  border-radius: 8px !important;
  font-weight: 600 !important;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
  transition: all 0.3s ease !important;
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.5) !important;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple)) !important;
}
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
  padding: 8px;
}

/* ============================================
   Hero 区域 - 全屏居中
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 0 80px;
  position: relative;
  overflow: hidden;
}
.hero-content {
  max-width: 900px;
  position: relative;
  z-index: 2;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 22px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(168, 85, 247, 0.06));
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 50px;
  font-size: 13px;
  color: #e0f0ff;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 28px;
  position: relative;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: all 0.3s ease;
}
.hero-badge:hover {
  border-color: rgba(0, 212, 255, 0.4);
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transform: translateY(-1px);
}
.hero-badge .dot {
  width: 16px; height: 16px;
  position: relative;
  flex-shrink: 0;
}
.hero-badge .dot::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 1.5px solid rgba(0, 212, 255, 0.5);
  border-radius: 50%;
  animation: badgeRingPulse 2s ease-in-out infinite;
}
.hero-badge .dot::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 6px; height: 6px;
  background: linear-gradient(135deg, #00ffcc, #00d4ff);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.8), 0 0 16px rgba(0, 212, 255, 0.4);
}
@keyframes badgeRingPulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.2); opacity: 0.2; }
}
.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 24px;
  color: var(--text-primary);
  letter-spacing: -1px;
}
.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--neon-blue) 0%, var(--neon-cyan) 50%, var(--neon-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}
.hero-title .gradient-text::after {
  content: attr(data-text);
  position: absolute;
  left: 0; top: 0;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-cyan), var(--neon-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: blur(20px);
  opacity: 0.6;
  z-index: -1;
}
.hero-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 36px;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #fff;
  text-decoration: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 25px rgba(0, 212, 255, 0.4);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(0, 212, 255, 0.6);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 36px;
  background: transparent;
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  border: 1px solid var(--border-neon);
  cursor: pointer;
  transition: all 0.3s ease;
}
.btn-secondary:hover {
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--neon-blue);
  box-shadow: var(--glow-blue);
  transform: translateY(-3px);
}

/* Hero 数据条 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  backdrop-filter: blur(20px);
  position: relative;
}
.hero-stats::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 60%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-blue), transparent);
}
.stat-item {
  text-align: center;
  position: relative;
}
.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -10px; top: 50%;
  transform: translateY(-50%);
  width: 1px; height: 40px;
  background: var(--border-subtle);
}
.stat-num {
  font-size: 32px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
}

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 12px;
  animation: scrollBounce 2s ease-in-out infinite;
}
.scroll-hint .mouse {
  width: 24px; height: 38px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}
.scroll-hint .mouse::after {
  content: '';
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 8px;
  background: var(--neon-blue);
  border-radius: 2px;
  animation: mouseScroll 1.5s ease-in-out infinite;
}
@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}
@keyframes mouseScroll {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 18px; }
}

/* ============================================
   通用区块
   ============================================ */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-tag {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--border-neon);
  border-radius: 50px;
  font-size: 12px;
  color: var(--neon-blue);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}
.section-title .highlight {
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ============================================
   服务卡片 - 3D倾斜效果
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  perspective: 1000px;
  align-items: stretch;
}
.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 32px 28px;
  backdrop-filter: blur(20px);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  display: flex;
  flex-direction: column;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon-blue), var(--neon-purple), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}
.service-card::after {
  content: '';
  position: absolute;
  top: -50%; right: -50%;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.15), transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}
.service-card:hover {
  transform: translateY(-8px) rotateX(2deg) rotateY(-2deg);
  border-color: var(--border-neon);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 212, 255, 0.15);
}
.service-card:hover::before { opacity: 1; }
.service-card:hover::after { opacity: 1; }
.service-icon {
  width: 54px; height: 54px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.18), rgba(168, 85, 247, 0.12));
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  transition: all 0.4s ease;
  position: relative;
  flex-shrink: 0;
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.service-card:hover .service-icon {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.25), rgba(168, 85, 247, 0.18));
  border-color: rgba(0, 212, 255, 0.5);
  box-shadow: 0 6px 25px rgba(0, 212, 255, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
.service-icon svg {
  display: block;
  filter: drop-shadow(0 0 6px rgba(0, 212, 255, 0.5));
}
.service-card:hover .service-icon {
  transform: scale(1.1) rotate(5deg);
  box-shadow: var(--glow-blue);
}
.service-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.service-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
  flex: 1;
}
.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}
.service-tag {
  padding: 4px 10px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: 6px;
  font-size: 11px;
  color: var(--neon-blue);
}

/* ============================================
   时间线 - 霓虹管道
   ============================================ */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--neon-blue), var(--neon-purple), var(--neon-cyan));
  transform: translateX(-50%);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}
.timeline-item {
  display: flex;
  margin-bottom: 40px;
  position: relative;
}
.timeline-item:nth-child(odd) {
  flex-direction: row;
  padding-right: calc(50% + 30px);
  text-align: right;
}
.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
  padding-left: calc(50% + 30px);
  text-align: left;
}
.timeline-dot {
  position: absolute;
  left: 50%;
  top: 20px;
  transform: translateX(-50%);
  width: 20px; height: 20px;
  background: var(--bg-primary);
  border: 3px solid var(--neon-blue);
  border-radius: 50%;
  box-shadow: var(--glow-blue);
  z-index: 2;
}
.timeline-dot::after {
  content: '';
  position: absolute;
  inset: 3px;
  background: var(--neon-cyan);
  border-radius: 50%;
}
.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
  width: 100%;
}
.timeline-content:hover {
  border-color: var(--border-neon);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}
.timeline-step {
  display: inline-block;
  padding: 4px 12px;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #fff;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 12px;
}
.timeline-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.timeline-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   优势区域
   ============================================ */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  padding: 28px 24px;
  text-align: center;
  backdrop-filter: blur(20px);
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}
.advantage-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
  transform: scaleX(0);
  transition: transform 0.4s ease;
}
.advantage-card:hover::before { transform: scaleX(1); }
.advantage-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-neon);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}
.advantage-num {
  font-size: 48px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  line-height: 1;
}
.advantage-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.advantage-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  margin-bottom: 14px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
}
.faq-item:hover {
  border-color: var(--border-neon);
}
.faq-item.active {
  border-color: var(--border-neon);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
}
.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  transition: color 0.3s ease;
}
.faq-item.active .faq-question {
  color: var(--neon-blue);
}
.faq-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--neon-blue);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}
.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}
.faq-answer p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================
   咨询区域
   ============================================ */
.consult-section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}
.consult-wrap {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: stretch;
}
.consult-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 40px;
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.consult-form-card form {
  flex: 1;
  display: flex;
  flex-direction: column;
}
.consult-form-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), var(--neon-cyan));
}
.form-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.form-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}
.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 13px 16px;
  background: rgba(5, 8, 16, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  font-size: 14px;
  color: var(--text-primary);
  outline: none;
  transition: all 0.3s ease;
  font-family: inherit;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--neon-blue);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1), 0 0 15px rgba(0, 212, 255, 0.15);
  background: rgba(5, 8, 16, 0.95);
}
.form-group textarea {
  resize: vertical;
  min-height: 100px;
}
.form-submit {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 25px rgba(0, 212, 255, 0.35);
  margin-top: auto;
  position: relative;
  overflow: hidden;
}
.form-submit::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}
.form-submit:hover::before { left: 100%; }
.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 35px rgba(0, 212, 255, 0.5);
}
.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* 联系信息卡片 */
.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 36px;
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.contact-info-card::before {
  content: '';
  position: absolute;
  top: -30%; right: -30%;
  width: 250px; height: 250px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.1), transparent 70%);
  border-radius: 50%;
}
.contact-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
  position: relative;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}
.contact-item:last-of-type { border-bottom: none; }
.contact-icon {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(168, 85, 247, 0.1));
  border: 1px solid var(--border-neon);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.contact-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}
.qr-section {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  position: relative;
}
.qr-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.qr-code {
  width: 140px; height: 140px;
  margin: 0 auto;
  padding: 10px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}
.qr-code img {
  width: 100%; height: 100%;
  object-fit: contain;
  border-radius: 6px;
}
.qr-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 10px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: rgba(5, 8, 16, 0.95);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  position: relative;
  z-index: 1;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 50%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-blue), transparent);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand h3 {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.footer-brand h3 span {
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.footer-col ul {
  list-style: none;
}
.footer-col li {
  margin-bottom: 10px;
}
.footer-col a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  transition: all 0.3s ease;
}
.footer-col a:hover {
  color: var(--neon-blue);
  padding-left: 4px;
}
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}
.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--border-neon);
  border-radius: 8px;
  color: var(--neon-blue);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}
.back-to-top:hover {
  background: rgba(0, 212, 255, 0.2);
  box-shadow: var(--glow-blue);
  transform: translateY(-2px);
}

/* ============================================
   Toast 提示
   ============================================ */
.toast {
  position: fixed;
  top: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: 14px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-neon);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4), var(--glow-blue);
  z-index: 9999;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.success { border-color: rgba(34, 255, 136, 0.4); }
.toast.error { border-color: rgba(239, 68, 68, 0.4); }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .consult-wrap { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: rgba(5, 8, 16, 0.98);
    backdrop-filter: blur(20px);
    padding: 20px;
    border-bottom: 1px solid var(--border-neon);
    gap: 4px;
  }
  .hero { padding: 100px 0 60px; min-height: auto; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; padding: 20px; }
  .stat-item:not(:last-child)::after { display: none; }
  .services-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr 1fr; }
  .timeline::before { left: 20px; }
  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    flex-direction: row;
    padding-left: 50px;
    padding-right: 0;
    text-align: left;
  }
  .timeline-dot { left: 20px; }
  .form-row { grid-template-columns: 1fr; }
  .consult-form-card, .contact-info-card { padding: 28px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section { padding: 70px 0; }
  .scroll-hint { display: none; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
  .advantages-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
}