/* ============================================
   苏州音视云通科技有限公司 - 企业官网样式
   纯CSS，无框架依赖，适配Silex可视化编辑
   ============================================ */

/* ---- 字体导入 ---- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+SC:wght@300;400;500;600;700;900&display=swap');

/* ---- CSS变量 ---- */
:root {
  --bg-primary: #050517;
  --bg-secondary: #0a0a2a;
  --bg-card: rgba(14, 27, 69, 0.5);
  --bg-card-solid: #0e1b45;
  --color-cyan: #58F5F5;
  --color-purple: #B344FF;
  --color-pink: #FFB6FF;
  --color-white: #f8fafc;
  --color-gray-light: #CBD5E1;
  --color-gray: #94A3B8;
  --color-gray-dark: #64748B;
  --color-border: rgba(88, 245, 245, 0.12);
  --color-border-hover: rgba(88, 245, 245, 0.3);
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
  --max-width: 1280px;
  --nav-height: 72px;
  --radius: 12px;
  --radius-sm: 8px;
}

/* ---- 基础重置 ---- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--color-gray-light);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}
h1, h2, h3, h4, h5, h6 { font-family: var(--font-display); color: var(--color-white); font-weight: 700; line-height: 1.3; }
a { text-decoration: none; color: inherit; transition: color 0.3s; }
a:hover { color: var(--color-cyan); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ---- 工具类 ---- */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section-padding { padding: 120px 0; }
.text-gradient {
  background: linear-gradient(90deg, var(--color-pink), var(--color-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-label {
  display: flex; align-items: center; gap: 12px; margin-bottom: 20px;
  font-size: 12px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--color-cyan); font-weight: 500;
}
.section-label::before {
  content: ''; display: block; width: 32px; height: 2px;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-purple));
}
.section-header {
  display: flex; align-items: flex-end; justify-content: space-between;
  flex-wrap: wrap; gap: 20px; margin-bottom: 48px;
}
.section-header h2 { font-size: 40px; font-weight: 900; }
.section-header p { color: var(--color-gray); max-width: 560px; margin-top: 8px; }

/* ============================================
   顶部导航
   ============================================ */
.site-nav {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: all 0.4s ease;
}
.site-nav.scrolled {
  background: rgba(5, 5, 23, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}
.site-nav .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}
.nav-brand {
  display: flex; align-items: center; gap: 12px;
}
.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: contain;
  flex-shrink: 0;
}
.site-nav .logo-img {
  height: 46px;
  width: auto;
}
.footer-brand .logo-img {
  height: 52px;
  width: auto;
}
.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex: 1;
}
.nav-links a {
  font-size: 14px; font-weight: 500;
  color: var(--color-gray); letter-spacing: 0.03em;
  position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--color-cyan); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -6px; left: 0; right: 0;
  height: 2px; background: linear-gradient(90deg, var(--color-cyan), var(--color-purple));
  border-radius: 1px;
}
.btn-glow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 24px; font-size: 13px; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--color-white); border: 1px solid rgba(88, 245, 245, 0.35);
  border-radius: 4px; position: relative; overflow: hidden;
  transition: all 0.4s ease; cursor: pointer;
}
.btn-glow:hover {
  box-shadow: 0 0 30px rgba(179, 68, 255, 0.25), 0 0 60px rgba(88, 245, 245, 0.1);
  border-color: transparent;
}
.btn-glow::before {
  content: ''; position: absolute; inset: -1px; border-radius: 4px; padding: 1px;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-purple));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: opacity 0.4s ease;
}
.btn-glow:hover::before { opacity: 1; }
.btn-glow.small { padding: 8px 20px; font-size: 12px; }

/* 移动端菜单 */
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--color-white); transition: all 0.3s; border-radius: 1px;
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================
   Hero首屏 - AI科技背景
   ============================================ */
.hero-section {
  position: relative; width: 100%; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; background: var(--bg-primary);
}
/* 点阵网格背景 */
.hero-section::before {
  content: ''; position: absolute; inset: 0; z-index: 0;
  background-image:
    radial-gradient(circle, rgba(88, 245, 245, 0.08) 1px, transparent 1px),
    radial-gradient(circle, rgba(179, 68, 255, 0.05) 1px, transparent 1px);
  background-size: 40px 40px, 80px 80px;
  background-position: 0 0, 20px 20px;
  animation: gridMove 30s linear infinite;
}
@keyframes gridMove {
  0% { background-position: 0 0, 20px 20px; }
  100% { background-position: 40px 40px, 100px 100px; }
}
/* 浮动粒子（纯CSS） */
.hero-particles {
  position: absolute; inset: 0; z-index: 1; overflow: hidden; pointer-events: none;
}
.hero-particles .particle {
  position: absolute; border-radius: 50%;
  animation: floatParticle linear infinite;
}
.hero-particles .particle:nth-child(1) { width: 3px; height: 3px; background: var(--color-cyan); left: 10%; top: 80%; animation-duration: 15s; animation-delay: 0s; }
.hero-particles .particle:nth-child(2) { width: 2px; height: 2px; background: var(--color-purple); left: 20%; top: 90%; animation-duration: 20s; animation-delay: 2s; }
.hero-particles .particle:nth-child(3) { width: 4px; height: 4px; background: var(--color-pink); left: 30%; top: 85%; animation-duration: 18s; animation-delay: 4s; }
.hero-particles .particle:nth-child(4) { width: 2px; height: 2px; background: var(--color-cyan); left: 50%; top: 95%; animation-duration: 22s; animation-delay: 1s; }
.hero-particles .particle:nth-child(5) { width: 3px; height: 3px; background: var(--color-purple); left: 60%; top: 88%; animation-duration: 16s; animation-delay: 6s; }
.hero-particles .particle:nth-child(6) { width: 2px; height: 2px; background: var(--color-cyan); left: 70%; top: 92%; animation-duration: 25s; animation-delay: 3s; }
.hero-particles .particle:nth-child(7) { width: 3px; height: 3px; background: var(--color-pink); left: 80%; top: 87%; animation-duration: 19s; animation-delay: 5s; }
.hero-particles .particle:nth-child(8) { width: 2px; height: 2px; background: var(--color-cyan); left: 90%; top: 93%; animation-duration: 21s; animation-delay: 7s; }
.hero-particles .particle:nth-child(9) { width: 4px; height: 4px; background: var(--color-purple); left: 15%; top: 70%; animation-duration: 17s; animation-delay: 8s; }
.hero-particles .particle:nth-child(10) { width: 2px; height: 2px; background: var(--color-cyan); left: 45%; top: 75%; animation-duration: 23s; animation-delay: 2s; }
.hero-particles .particle:nth-child(11) { width: 3px; height: 3px; background: var(--color-pink); left: 75%; top: 72%; animation-duration: 14s; animation-delay: 9s; }
.hero-particles .particle:nth-child(12) { width: 2px; height: 2px; background: var(--color-purple); left: 85%; top: 78%; animation-duration: 20s; animation-delay: 4s; }
@keyframes floatParticle {
  0% { transform: translateY(0) translateX(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-100vh) translateX(30px); opacity: 0; }
}
/* 科技发光线条 */
.hero-lines {
  position: absolute; inset: 0; z-index: 1; overflow: hidden; pointer-events: none;
}
.hero-lines .line {
  position: absolute; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(88, 245, 245, 0.15), rgba(179, 68, 255, 0.1), transparent);
  animation: lineMove linear infinite;
}
.hero-lines .line:nth-child(1) { width: 300px; top: 20%; left: -300px; animation-duration: 12s; animation-delay: 0s; }
.hero-lines .line:nth-child(2) { width: 200px; top: 35%; left: -200px; animation-duration: 15s; animation-delay: 3s; }
.hero-lines .line:nth-child(3) { width: 400px; top: 50%; left: -400px; animation-duration: 18s; animation-delay: 6s; }
.hero-lines .line:nth-child(4) { width: 250px; top: 65%; left: -250px; animation-duration: 14s; animation-delay: 2s; }
.hero-lines .line:nth-child(5) { width: 350px; top: 80%; left: -350px; animation-duration: 16s; animation-delay: 5s; }
@keyframes lineMove {
  0% { transform: translateX(0); }
  100% { transform: translateX(calc(100vw + 400px)); }
}
/* 对角渐变光带 */
.hero-diagonal {
  position: absolute; bottom: 0; left: 0; width: 60vw; height: 3px;
  background: linear-gradient(90deg, var(--color-pink), var(--color-purple));
  transform: rotate(-15deg) translateY(-30vh) translateX(-10vw);
  opacity: 0.5; z-index: 2; filter: blur(1px);
}
/* 中心光晕 */
.hero-glow {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 600px; height: 600px; border-radius: 50%; z-index: 1;
  background: radial-gradient(circle, rgba(179, 68, 255, 0.06) 0%, transparent 70%);
  pointer-events: none; animation: glowPulse 6s ease-in-out infinite;
}
@keyframes glowPulse {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
}
/* Hero内容 */
.hero-content {
  position: relative; z-index: 10; text-align: center;
  max-width: 860px; padding: 0 24px; padding-top: var(--nav-height);
}
.hero-company {
  font-size: 22px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-cyan);
  font-weight: 700;
  margin-bottom: 16px;
}

.hero-slogan {
  font-size: 18px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-cyan);
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-title {
  font-size: 52px; font-weight: 900; line-height: 1.2;
  margin-bottom: 24px; letter-spacing: -0.02em;
}
.hero-title span { display: block; }
.hero-title .text-white { color: var(--color-white); }
.hero-desc {
  font-size: 16px; color: var(--color-gray); max-width: 560px;
  margin: 0 auto 36px; line-height: 1.8;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 36px; font-size: 14px; font-weight: 600;
  letter-spacing: 0.05em; color: var(--color-white);
  background: linear-gradient(135deg, rgba(88, 245, 245, 0.15), rgba(179, 68, 255, 0.15));
  border: 1px solid rgba(88, 245, 245, 0.35); border-radius: 4px;
  transition: all 0.4s ease; cursor: pointer;
}
.btn-primary:hover {
  background: linear-gradient(135deg, rgba(88, 245, 245, 0.25), rgba(179, 68, 255, 0.25));
  box-shadow: 0 0 30px rgba(179, 68, 255, 0.2);
  border-color: var(--color-cyan);
}
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 36px; font-size: 14px; font-weight: 600;
  letter-spacing: 0.05em; color: var(--color-gray-light);
  border: 1px solid var(--color-border); border-radius: 4px;
  transition: all 0.4s ease; cursor: pointer; background: transparent;
}
.btn-outline:hover {
  border-color: var(--color-cyan); color: var(--color-cyan);
}

/* ============================================
   卡片系统
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }

.card-image {
  position: relative; width: 100%; overflow: hidden;
}
.card-image img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.7s ease;
}
.product-card:hover .card-image img,
.solution-card:hover .card-image img,
.case-card:hover .card-image img,
.card-image-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, var(--bg-primary), transparent);
  opacity: 0.6;
}
.card-body { padding: 24px; }
.card-body h3 {
  font-size: 18px; font-weight: 700; color: var(--color-white);
  margin-bottom: 10px; transition: color 0.3s;
}
.card-body p {
  font-size: 14px; color: var(--color-gray); line-height: 1.7;
  margin-bottom: 16px;
}
.card-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--color-cyan);
  letter-spacing: 0.05em; text-transform: uppercase; font-weight: 500;
}
.card-link svg { width: 14px; height: 14px; transition: transform 0.3s; }
.card-link:hover svg { transform: translateX(4px); }

/* 标签 */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px; font-size: 11px; font-weight: 500;
  letter-spacing: 0.05em; text-transform: uppercase; border-radius: 4px;
}
.tag-cyan { color: var(--color-cyan); background: rgba(88, 245, 245, 0.1); border: 1px solid rgba(88, 245, 245, 0.25); }
.tag-purple { color: var(--color-purple); background: rgba(179, 68, 255, 0.1); border: 1px solid rgba(179, 68, 255, 0.25); }
.tag-pink { color: var(--color-pink); background: rgba(255, 182, 255, 0.1); border: 1px solid rgba(255, 182, 255, 0.25); }

/* 分类Tab */
.category-tab:hover { color: var(--color-cyan); border-color: rgba(88, 245, 245, 0.3); }
/* ============================================
   关于我们
   ============================================ */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start;
}
.about-text p { color: var(--color-gray); margin-bottom: 16px; line-height: 1.8; }
.about-tags {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px;
}
.about-tags .tag-item {
  padding: 8px 16px; font-size: 12px; letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--color-cyan);
  border: 1px solid rgba(88, 245, 245, 0.25); border-radius: 4px;
}
.stats-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.stat-card {
  padding: 24px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}
.stat-card .stat-value {
  font-size: 32px; font-weight: 900; color: var(--color-white); margin: 8px 0 4px;
}
.stat-card .stat-label {
  font-size: 12px; color: var(--color-gray); letter-spacing: 0.05em;
}

/* ============================================
   客户Logo
   ============================================ */
.customer-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}
.customer-card {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 32px 24px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--color-border);
  transition: all 0.3s ease; min-height: 140px;
}
.customer-card:hover {
  transform: translateY(-4px); border-color: var(--color-border-hover);
}
.customer-card img {
  max-width: 70%; max-height: 48px; object-fit: contain;
  opacity: 0.7; filter: grayscale(100%) brightness(1.3);
  transition: all 0.3s;
}
.customer-card:hover img {
  opacity: 1; filter: grayscale(0%) brightness(1);
}
.customer-card span {
  margin-top: 12px; font-size: 12px; color: var(--color-gray);
  letter-spacing: 0.05em;
}
.customer-card.placeholder {
  border: 2px dashed rgba(88, 245, 245, 0.15);
  background: rgba(14, 27, 69, 0.2);
}
.customer-card.placeholder span {
  font-size: 11px; color: var(--color-gray-dark);
  text-transform: uppercase; letter-spacing: 0.1em;
}

/* ============================================
   联系我们
   ============================================ */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
}
.contact-info-item {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 20px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--color-border);
  margin-bottom: 16px;
}
.contact-info-item .icon-box {
  width: 44px; height: 44px; border-radius: 10px;
  background: rgba(88, 245, 245, 0.08);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.contact-info-item .icon-box svg { width: 20px; height: 20px; color: var(--color-cyan); }
.contact-info-item .info-label {
  font-size: 11px; color: var(--color-gray); text-transform: uppercase;
  letter-spacing: 0.08em; margin-bottom: 4px;
}
.contact-info-item .info-value {
  font-size: 14px; color: var(--color-white); font-weight: 500;
}
.contact-form {
  padding: 32px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid rgba(179, 68, 255, 0.15);
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 12px; color: var(--color-gray);
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px;
}
.form-group input,
.form-group textarea {
  width: 100%; padding: 12px 16px; font-size: 14px;
  background: rgba(5, 5, 23, 0.6); color: var(--color-white);
  border: 1px solid rgba(88, 245, 245, 0.2); border-radius: var(--radius-sm);
  outline: none; transition: border-color 0.3s;
}
.form-group input:focus,
.form-group textarea:focus { border-color: var(--color-cyan); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.btn-submit {
  width: 100%; padding: 14px; font-size: 14px; font-weight: 600;
  color: var(--color-white); background: linear-gradient(135deg, rgba(88, 245, 245, 0.15), rgba(179, 68, 255, 0.15));
  border: 1px solid rgba(88, 245, 245, 0.35); border-radius: 4px;
  cursor: pointer; transition: all 0.4s ease; letter-spacing: 0.05em;
}
.btn-submit:hover {
  box-shadow: 0 0 30px rgba(179, 68, 255, 0.2);
  border-color: var(--color-cyan);
}

/* ============================================
   详情页
   ============================================ */
.page-header-bar .breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--color-gray-dark); margin-bottom: 16px;
}
.breadcrumb a { color: var(--color-gray); }
.breadcrumb a:hover { color: var(--color-cyan); }
.breadcrumb .sep { color: var(--color-gray-dark); }

.detail-layout {
  display: grid; grid-template-columns: 1fr 360px; gap: 48px;
}
.detail-main h1 { font-size: 36px; font-weight: 900; margin-bottom: 16px; }
.detail-main .spec-table {
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--color-border); background: var(--bg-card);
}
.spec-row {
  display: grid; grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid rgba(88, 245, 245, 0.05);
}
.spec-row:last-child { border-bottom: none; }
.spec-row:nth-child(odd) .spec-cell:first-child { border-right: 1px solid rgba(88, 245, 245, 0.05); }
.spec-cell {
  padding: 16px 24px; display: flex; align-items: center; justify-content: space-between;
}
.spec-cell .spec-key { font-size: 14px; color: var(--color-gray); }
.spec-cell .spec-value { font-size: 14px; color: var(--color-white); font-weight: 500; }

.feature-list { margin-bottom: 32px; }
.feature-item {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 0;
}
.feature-item .feature-icon {
  width: 24px; height: 24px; border-radius: 50%;
  background: rgba(88, 245, 245, 0.12);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 2px;
}
.feature-item .feature-icon svg { width: 14px; height: 14px; color: var(--color-cyan); }
.feature-item span { font-size: 15px; color: var(--color-gray-light); }

.detail-sidebar .sidebar-card {
  padding: 24px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--color-border);
  position: sticky; top: 100px;
}
.detail-sidebar .sidebar-card h4 { font-size: 16px; margin-bottom: 12px; }
.detail-sidebar .sidebar-card p { font-size: 14px; color: var(--color-gray); margin-bottom: 20px; }

/* 相关推荐 */
.related-section { padding: 64px 0; border-top: 1px solid var(--color-border); }
.related-section h3 { font-size: 20px; margin-bottom: 24px; }

/* ============================================
   列表页（二级页）
   ============================================ */
.list-page { min-height: 100vh; }
.list-page .page-intro {
  padding: 48px 0 0;
}
.list-page .page-intro h1 { font-size: 40px; font-weight: 900; margin-bottom: 12px; }
.list-page .page-intro p { color: var(--color-gray); max-width: 600px; }

.list-item {
  display: flex; gap: 24px; padding: 24px;
  background: var(--bg-card); border: 1px solid var(--color-border);
  border-radius: var(--radius); margin-bottom: 16px;
  transition: all 0.3s ease; cursor: pointer;
}
.list-item:hover {
  transform: translateX(8px);
  border-color: var(--color-border-hover);
}
.list-item:hover .list-item-image img { transform: scale(1.05); }
.list-item:hover h3 { color: var(--color-cyan); }
/* ============================================
   页脚
   ============================================ */
.site-footer {
  background: #0a0a1f;
  border-top: 1px solid var(--color-border);
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 48px;
  padding: 64px 0 48px;
}
.footer-brand p { font-size: 14px; color: var(--color-gray-dark); line-height: 1.7; margin: 16px 0; }
.footer-contact-mini {
  display: flex; flex-direction: column; gap: 8px;
  font-size: 12px; color: var(--color-gray-dark);
}
.footer-contact-mini span { display: flex; align-items: center; gap: 8px; }
.footer-contact-mini svg { width: 14px; height: 14px; color: var(--color-cyan); }
.footer-column h4 {
  font-size: 12px; color: var(--color-white); letter-spacing: 0.15em;
  text-transform: uppercase; font-weight: 600; margin-bottom: 20px;
}
.footer-column ul li { margin-bottom: 12px; }
.footer-column ul li a {
  font-size: 14px; color: var(--color-gray-dark);
  transition: color 0.3s;
}
.footer-column ul li a:hover { color: var(--color-cyan); }
.footer-more {
  display: inline-flex; align-items: center; gap: 4px;
  margin-top: 12px; font-size: 12px; color: var(--color-cyan);
  letter-spacing: 0.05em;
}
.footer-more svg { width: 14px; height: 14px; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding: 24px 0; border-top: 1px solid var(--color-border);
  font-size: 12px; color: #475569;
}
.footer-bottom a { color: #475569; margin-left: 24px; transition: color 0.3s; }
.footer-bottom a:hover { color: var(--color-gray); }

/* ============================================
   滚动动画
   ============================================ */
.reveal {
  opacity: 0; transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================
   返回顶部
   ============================================ */
.back-to-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 999;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--bg-card); border: 1px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; opacity: 0; visibility: hidden;
  transition: all 0.3s ease; color: var(--color-cyan);
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { border-color: var(--color-cyan); box-shadow: 0 0 20px rgba(88, 245, 245, 0.15); }
.back-to-top svg { width: 18px; height: 18px; }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .customer-grid { grid-template-columns: repeat(3, 1fr); }
  .about-grid { gap: 40px; }
  .detail-layout { grid-template-columns: 1fr; }
  .detail-sidebar .sidebar-card { position: static; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: rgba(5, 5, 23, 0.98); backdrop-filter: blur(20px);
    padding: 24px; gap: 20px; border-bottom: 1px solid var(--color-border);
  }
  .nav-toggle { display: flex; }
  .hero-title { font-size: 32px; }
  .section-header h2 { font-size: 28px; }
  .section-header { flex-direction: column; align-items: flex-start; }
.about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .customer-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .list-item { flex-direction: column; }
  .form-row { grid-template-columns: 1fr; }
  .section-padding { padding: 80px 0; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-title { font-size: 26px; }
  .customer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ============================================
   文章排版
   ============================================ */
.article-body {
  max-width: 760px; margin: 0 auto; padding: 48px 0;
}
.article-body h1 { font-size: 32px; margin-bottom: 16px; line-height: 1.3; }
.article-meta {
  display: flex; align-items: center; gap: 12px;
  font-size: 13px; color: var(--color-gray-dark); margin-bottom: 32px;
}
.article-meta svg { width: 14px; height: 14px; }
.article-body .lead {
  font-size: 16px; color: var(--color-gray); line-height: 1.8; margin-bottom: 32px;
}
.article-body .article-content {
  font-size: 15px; line-height: 1.9; color: var(--color-gray-light);
}
.article-body .article-content p { margin-bottom: 20px; }
.article-cover {
  width: 100%; height: 40vh; min-height: 260px;
  border-radius: var(--radius); overflow: hidden; margin-bottom: 32px;
}
.article-cover img { width: 100%; height: 100%; object-fit: cover; }

/* 高光亮点 */
.highlight-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 32px 0;
}

/* ============================================
   Hero 科技背景增强 - AI 通信网络元素
   ============================================ */

/* 网络节点层 */
.hero-network {
  position: absolute; inset: 0; z-index: 2;
  overflow: hidden; pointer-events: none;
  transition: transform 0.3s ease-out;
}
.hero-network-node {
  position: absolute;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: rgba(88, 245, 245, 0.5);
  box-shadow: 0 0 6px rgba(88, 245, 245, 0.3);
  animation: nodePulse ease-in-out infinite;
}
@keyframes nodePulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.6); }
}

/* 节点连接线 */
.hero-network-link {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, rgba(88, 245, 245, 0.15), rgba(179, 68, 255, 0.1), transparent);
  transform-origin: center center;
  pointer-events: none;
}

/* 数据包脉冲（沿连线移动） */
.hero-packet {
  position: absolute;
  height: 2px; width: 8px;
  background: rgba(88, 245, 245, 0.7);
  border-radius: 1px;
  box-shadow: 0 0 4px rgba(88, 245, 245, 0.5);
  transform-origin: left center;
  animation: packetMove linear forwards;
  pointer-events: none;
}
@keyframes packetMove {
  0% { opacity: 0; transform: translateX(-10px) scaleX(0.5); }
  15% { opacity: 1; transform: translateX(0) scaleX(1); }
  85% { opacity: 1; }
  100% { opacity: 0; transform: translateX(calc(var(--link-w, 200px) - 8px)) scaleX(0.5); }
}

/* 信号扫描圆环 */
.hero-ring::before {
  content: '';
  position: absolute; inset: 8px;
  border-radius: 50%;
  border: 1px solid rgba(179, 68, 255, 0.08);
}
@keyframes ringExpand {
  0% { transform: scale(0.6); opacity: 0; }
  20% { opacity: 0.6; }
  80% { opacity: 0.2; }
  100% { transform: scale(1.8); opacity: 0; }
}

/* 数据流光点 */
.hero-data-particle {
  position: absolute;
  border-radius: 50%;
  opacity: 0;
  animation: dataFlowMove linear infinite;
  filter: blur(0.5px);
}
@keyframes dataFlowMove {
  0% { opacity: 0; transform: translate(0, 0); }
  15% { opacity: 0.7; }
  85% { opacity: 0.7; }
  100% { opacity: 0; transform: translate(var(--df-x, 30px), var(--df-y, -20px)); }
}

/* 左右边缘 AI 电路纹理 */
.hero-circuit-left,
.hero-circuit-right {
  position: absolute;
  top: 0; bottom: 0;
  width: 140px;
  z-index: 1;
  pointer-events: none;
  opacity: 0.25;
}
.hero-circuit-left {
  left: 0;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0px,
      transparent 18px,
      rgba(88, 245, 245, 0.04) 18px,
      rgba(88, 245, 245, 0.04) 19px
    ),
    repeating-linear-gradient(
      0deg,
      transparent 0px,
      transparent 24px,
      rgba(88, 245, 245, 0.03) 24px,
      rgba(88, 245, 245, 0.03) 25px
    );
  -webkit-mask-image: linear-gradient(90deg, rgba(0,0,0,0.6) 0%, transparent 100%);
  mask-image: linear-gradient(90deg, rgba(0,0,0,0.6) 0%, transparent 100%);
}
.hero-circuit-right {
  right: 0;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0px,
      transparent 18px,
      rgba(179, 68, 255, 0.04) 18px,
      rgba(179, 68, 255, 0.04) 19px
    ),
    repeating-linear-gradient(
      0deg,
      transparent 0px,
      transparent 24px,
      rgba(179, 68, 255, 0.03) 24px,
      rgba(179, 68, 255, 0.03) 25px
    );
  -webkit-mask-image: linear-gradient(270deg, rgba(0,0,0,0.6) 0%, transparent 100%);
  mask-image: linear-gradient(270deg, rgba(0,0,0,0.6) 0%, transparent 100%);
}

/* ============================================
   移动端适配 - 弱化复杂背景
   ============================================ */
@media (max-width: 768px) {
  .hero-network-node,
  .hero-network-link,
  .hero-packet { display: none; }
  .hero-data-particle { opacity: 0.4; }
  .hero-circuit-left,
  .hero-circuit-right { width: 60px; opacity: 0.15; }
}

@media (max-width: 480px) {
  .hero-ring,
  .hero-data-particle,
  .hero-circuit-left,
  .hero-circuit-right { display: none; }
}
.highlight-item {
  display: flex; align-items: center; gap: 12px;
  padding: 16px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--color-border);
}
.highlight-item svg { width: 20px; height: 20px; color: var(--color-cyan); flex-shrink: 0; }
.highlight-item span { font-size: 14px; color: var(--color-gray-light); }

/* 图片占位 */
.img-placeholder {
  width: 100%; background: linear-gradient(135deg, #0e1b45, #1a1033);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-gray-dark); font-size: 13px;
  border: 1px dashed rgba(88, 245, 245, 0.15);
}

/* ============================================
   Hero 科技背景增强 V2 - 拓扑/波纹/光线/电路
   ============================================ */

/* 通信网络拓扑图 */
.hero-topo {
  position: absolute;
  z-index: 3;
  pointer-events: none;
  opacity: 0.55;
}
.hero-topo svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}
.hero-topo-left {
  left: -2%;
  bottom: 8%;
  width: 340px;
  height: 300px;
  animation: topoFloat1 8s ease-in-out infinite;
}
.hero-topo-right {
  right: -1%;
  top: 18%;
  width: 300px;
  height: 270px;
  animation: topoFloat2 10s ease-in-out infinite;
}
@keyframes topoFloat1 {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(-10px) translateX(4px); }
}
@keyframes topoFloat2 {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(8px) translateX(-3px); }
}

/* 拓扑图节点呼吸光晕 */
.hero-topo svg circle[fill="#58F5F5"] {
  animation: topoNodePulse 3s ease-in-out infinite;
}
@keyframes topoNodePulse {
  0%, 100% { opacity: 0.25; }
  50% { opacity: 0.55; }
}

/* 信号波纹/雷达扫描圆环 */
.hero-signal-ring {
  position: absolute;
  z-index: 3;
  width: 120px;
  height: 120px;
  pointer-events: none;
}
.signal-ring-wave {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid rgba(88, 245, 245, 0.28);
  animation: signalExpand 4.5s ease-out infinite;
}
.signal-ring-wave::before {
  content: '';
  position: absolute;
  inset: 10px;
  border-radius: 50%;
  border: 1px solid rgba(88, 245, 245, 0.18);
}
.signal-ring-wave::after {
  content: '';
  position: absolute;
  inset: 22px;
  border-radius: 50%;
  border: 0.8px solid rgba(179, 68, 255, 0.14);
}
@keyframes signalExpand {
  0% { transform: scale(0.5); opacity: 0; }
  15% { opacity: 0.85; }
  60% { opacity: 0.3; }
  100% { transform: scale(1.6); opacity: 0; }
}

/* 数据流光线 */
.hero-stream {
  position: absolute;
  z-index: 3;
  pointer-events: none;
  height: 1px;
  border-radius: 1px;
  overflow: visible;
}
.hero-stream::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 1px;
}
.hero-stream::after {
  content: '';
  position: absolute;
  top: -1px;
  left: -8px;
  width: 16px;
  height: 3px;
  border-radius: 2px;
  filter: blur(1px);
  animation: streamMove linear infinite;
}

/* 光线 1：横向，偏上 */
.hero-stream-1 {
  top: 28%;
  left: 5%;
  width: 35%;
}
.hero-stream-1::before {
  background: linear-gradient(90deg, transparent 0%, rgba(88, 245, 245, 0.14) 40%, rgba(88, 245, 245, 0.06) 70%, transparent 100%);
}
.hero-stream-1::after {
  background: rgba(88, 245, 245, 0.55);
  animation-duration: 6s;
  animation-delay: 0s;
}

/* 光线 2：斜向，偏中 */
.hero-stream-2 {
  top: 55%;
  right: 8%;
  width: 30%;
  transform: rotate(-8deg);
}
.hero-stream-2::before {
  background: linear-gradient(90deg, transparent 0%, rgba(179, 68, 255, 0.12) 40%, rgba(179, 68, 255, 0.05) 70%, transparent 100%);
}
.hero-stream-2::after {
  background: rgba(179, 68, 255, 0.5);
  animation-duration: 8s;
  animation-delay: 2s;
}

/* 光线 3：斜向，偏下 */
.hero-stream-3 {
  bottom: 18%;
  left: 15%;
  width: 25%;
  transform: rotate(5deg);
}
.hero-stream-3::before {
  background: linear-gradient(90deg, transparent 0%, rgba(88, 245, 245, 0.1) 35%, rgba(179, 68, 255, 0.06) 65%, transparent 100%);
}
.hero-stream-3::after {
  background: linear-gradient(90deg, #58F5F5, #B344FF);
  opacity: 0.6;
  animation-duration: 7s;
  animation-delay: 4s;
}

@keyframes streamMove {
  0% { left: -8px; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { left: calc(100% - 8px); opacity: 0; }
}

/* 左右电路纹理增强版 */
.hero-circuit-left,
.hero-circuit-right {
  width: 160px;
  opacity: 0.35;
  z-index: 2;
}
.hero-circuit-left {
  background:
    repeating-linear-gradient(90deg, transparent 0px, transparent 16px, rgba(88, 245, 245, 0.06) 16px, rgba(88, 245, 245, 0.06) 17px),
    repeating-linear-gradient(0deg, transparent 0px, transparent 20px, rgba(88, 245, 245, 0.04) 20px, rgba(88, 245, 245, 0.04) 21px);
}
.hero-circuit-right {
  background:
    repeating-linear-gradient(90deg, transparent 0px, transparent 16px, rgba(179, 68, 255, 0.06) 16px, rgba(179, 68, 255, 0.06) 17px),
    repeating-linear-gradient(0deg, transparent 0px, transparent 20px, rgba(179, 68, 255, 0.04) 20px, rgba(179, 68, 255, 0.04) 21px);
}

/* ============================================
   移动端适配 - 弱化复杂背景
   ============================================ */
@media (max-width: 768px) {
  .hero-topo-left,
  .hero-topo-right { opacity: 0.25; width: 180px; height: 160px; }
  .hero-signal-ring { width: 70px; height: 70px; }
  .signal-ring-wave { border-width: 1px; opacity: 0.5; }
  .hero-stream { opacity: 0.5; }
  .hero-stream::after { width: 10px; height: 2px; }
  .hero-circuit-left,
  .hero-circuit-right { width: 60px; opacity: 0.15; }
}
@media (max-width: 480px) {
  .hero-topo-left,
  .hero-topo-right { display: none; }
  .hero-signal-ring { display: none; }
  .hero-stream { display: none; }
  .hero-circuit-left,
  .hero-circuit-right { display: none; }
}

/* ============================================
   Hero 背景装饰图片
   ============================================ */
.hero-bg-img {
  position: absolute;
  z-index: 3;
  pointer-events: none;
  user-select: none;
}
.hero-bg-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* 左下角 - 网络拓扑图 */
.hero-bg-network {
  left: -4%;
  bottom: 6%;
  width: 600px;
  height: 600px;
  animation: imgFloatLeft 10s ease-in-out infinite;
}
.hero-bg-network img {
  opacity: 0.42;
  filter: saturate(1.3) drop-shadow(0 0 24px rgba(88, 245, 245, 0.2));
  animation: imgGlowCyan 4s ease-in-out infinite;
}

/* 右侧 - 机器人客服形象图 */
.hero-bg-chip {
  right: 4%;
  top: 18%;
  width: 520px;
  height: 520px;
  animation: imgFloatRight 12s ease-in-out infinite;
}
.hero-bg-chip img {
  opacity: 0.52;
  filter: saturate(1.2) drop-shadow(0 0 32px rgba(179, 68, 255, 0.26));
  animation: imgGlowPurple 5s ease-in-out infinite;
}

/* 底部 - 数据流光效图 */
.hero-bg-dataflow {
  left: 50%;
  bottom: 4%;
  transform: translateX(-50%);
  width: 920px;
  height: 280px;
  animation: imgDriftBottom 14s ease-in-out infinite;
}
.hero-bg-dataflow img {
  opacity: 0.36;
  filter: saturate(1.3) drop-shadow(0 0 36px rgba(88, 245, 245, 0.18));
}

/* 动画定义 - 增强漂浮与呼吸效果 */
@keyframes imgFloatLeft {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(-18px) translateX(10px); }
}
@keyframes imgFloatRight {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(16px) translateX(-10px); }
}
@keyframes imgDriftBottom {
  0%, 100% { transform: translateX(-50%) translateX(0); }
  50% { transform: translateX(-50%) translateX(16px); }
}
@keyframes imgGlowCyan {
  0%, 100% { filter: saturate(1.3) drop-shadow(0 0 20px rgba(88, 245, 245, 0.16)); }
  50% { filter: saturate(1.3) drop-shadow(0 0 44px rgba(88, 245, 245, 0.32)); }
}
@keyframes imgGlowPurple {
  0%, 100% { filter: saturate(1.2) drop-shadow(0 0 24px rgba(179, 68, 255, 0.18)); }
  50% { filter: saturate(1.2) drop-shadow(0 0 52px rgba(179, 68, 255, 0.36)); }
}

/* 移动端适配 */
@media (max-width: 768px) {
  .hero-bg-network {
    left: -5%;
    bottom: 5%;
    width: 320px;
    height: 320px;
  }
  .hero-bg-network img { opacity: 0.32; }
  .hero-bg-chip {
    right: 2%;
    top: 16%;
    width: 280px;
    height: 280px;
  }
  .hero-bg-chip img { opacity: 0.38; }
  .hero-bg-dataflow {
    width: 480px;
    height: 160px;
    bottom: 2%;
  }
  .hero-bg-dataflow img { opacity: 0.24; }
}
@media (max-width: 480px) {
  .hero-bg-dataflow { display: none; }
  .hero-bg-network {
    width: 220px;
    height: 220px;
  }
  .hero-bg-network img { opacity: 0.26; }
  .hero-bg-chip {
    width: 200px;
    height: 200px;
    right: 1%;
    top: 14%;
  }
  .hero-bg-chip img { opacity: 0.30; }
}

/* 关于我们 - 照片网格 */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.photo-item {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(88,245,245,0.1);
  background: rgba(14,27,69,0.3);
  height: 200px;
}
@media (max-width: 768px) {
  .photo-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .photo-item {
    height: 160px;
  }
}

/* ============================================
   底部备案信息
   ============================================ */
.footer-record {
  text-align: center;
  font-size: 12px;
  color: var(--color-gray-dark);
  padding: 12px 0 4px;
  letter-spacing: 0.05em;
}

/* ============================================
   动态飘浮试用图标
   ============================================ */
.float-trial {
  position: fixed;
  right: 24px;
  bottom: 100px;
  z-index: 999;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: linear-gradient(135deg, rgba(88,245,245,0.15), rgba(179,68,255,0.15));
  backdrop-filter: blur(12px);
  border: 1px solid rgba(88,245,245,0.25);
  border-radius: 50px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3), 0 0 16px rgba(88,245,245,0.1);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  animation: floatBob 3s ease-in-out infinite;
  transition: all 0.3s ease;
}
.float-trial:hover {
  transform: translateY(-4px) scale(1.03);
  border-color: rgba(88,245,245,0.5);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4), 0 0 24px rgba(88,245,245,0.2);
  color: var(--color-cyan);
}
.float-trial-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  color: #fff;
  flex-shrink: 0;
}
.float-trial-icon svg {
  width: 18px;
  height: 18px;
}
.float-trial-text {
  text-align: left;
}

@keyframes floatBob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@media (max-width: 768px) {
  .float-trial {
    right: 12px;
    bottom: 80px;
    padding: 10px 14px;
    font-size: 12px;
  }
  .float-trial-icon {
    width: 32px;
    height: 32px;
  }
}