/* ============================================================
   style.css — 云霄科技 硬件科技品牌官网 样式表
   ============================================================

   目录：
   1. CSS 变量（颜色、字体、间距等全局变量）
   2. 基础重置与全局样式
   3. 导航栏（Navbar）
   4. Hero 首屏
   5. 通用 Section 样式
   6. 产品展示区（Products Grid）
   7. 技术指标区（Specs）
   8. 品牌介绍区（About）
   9. CTA 行动召唤区
   10. 页脚（Footer）
   11. 滚动动画类（AOS - Animation On Scroll）
   12. 响应式（Media Queries）

   ============================================================ */

/* ============================================================
   1. CSS 变量
   - 集中管理所有颜色、字体、间距，方便整体换肤
   - ★ 如需调整主题色，修改 --primary 和 --accent 的值即可
   ============================================================ */
:root {
  /* ---- 主色调 ---- */
  --primary:       #0066ff;       /* 主色：电光蓝 */
  --primary-dark:  #0044cc;       /* 深蓝（悬停状态） */
  --primary-light: #3388ff;       /* 浅蓝（发光效果） */
  --accent:        #a855f7;       /* 强调色：紫色 */
  --accent-light:  #c084fc;       /* 浅紫 */

  /* ---- 中性色 ---- */
  --bg-dark:       #08080e;       /* 最深层背景 */
  --bg-mid:        #0c0c16;       /* 中等深度背景 */
  --bg-card:       #111122;       /* 卡片背景 */
  --bg-elevated:   #16162a;       /* 上层元素背景 */
  --border-color:  rgba(255,255,255,0.06);
  --border-glow:   rgba(0,102,255,0.25);

  /* ---- 文字 ---- */
  --text-primary:  #f0f0ff;       /* 主文字（白略带蓝） */
  --text-secondary:#8888aa;       /* 次要文字 */
  --text-muted:    #555570;       /* 弱化文字 */

  /* ---- 字体 ---- */
  --font-sans:     'Inter', -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono:     'SF Mono', 'Fira Code', monospace;

  /* ---- 间距 ---- */
  --section-py:    120px;         /* 区段上下内边距 */
  --container-w:   1200px;        /* 内容最大宽度 */
  --gap-lg:        48px;
  --gap-md:        28px;
  --gap-sm:        16px;

  /* ---- 动画 ---- */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth:   cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition:    0.35s var(--ease-smooth);
}

/* ============================================================
   2. 基础重置与全局样式
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;         /* 平滑滚动 */
  scroll-padding-top: 80px;       /* 导航栏高度补偿 */
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 选中文字颜色 */
::selection {
  background: var(--primary);
  color: #fff;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* 通用按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 12px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  border: none;
  text-decoration: none;
}

.btn i {
  font-size: 0.85em;
  transition: transform 0.3s ease;
}

.btn:hover i {
  transform: translateX(4px) translateY(-1px);
}

/* 主按钮 — 渐变背景 + 发光 */
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 4px 24px rgba(0,102,255,0.3);
}

.btn-primary:hover {
  box-shadow: 0 8px 40px rgba(0,102,255,0.5);
  transform: translateY(-2px);
}

/* 边框按钮 */
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(0,102,255,0.08);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 18px 40px;
  font-size: 1.05rem;
  border-radius: 14px;
}

/* Section 标题通用样式 */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--primary-light);
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 6px 16px;
  border: 1px solid rgba(0,102,255,0.2);
  border-radius: 100px;
  background: rgba(0,102,255,0.06);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 480px;
  margin: 0 auto;
}

/* ============================================================
   3. 导航栏（Navbar）
   - fixed 固定定位
   - backdrop-filter 实现毛玻璃效果
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
  background: rgba(8,8,14,0.5);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
}

/* 页面滚动后导航栏变得不透明 + 加强毛玻璃 */
.navbar.scrolled {
  background: rgba(8,8,14,0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ★ Logo 下方小字 — 修改此文本样式可调整字体大小/颜色 */
.logo-sub {
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0px;
}

/* ★ 如需把文字 Logo 替换为图片 Logo：
     1. 将 logo 图片放入 images/ 目录
     2. 在 .logo 内添加 <img src="images/your-logo.png" class="logo-img" />
     3. 取消下方注释并使用，同时注释掉上面的 .logo-text
*/
/* .logo-img {
  height: 28px;
  width: auto;
} */

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease;
  border-radius: 2px;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  width: 100%;
}


/* ============================================================
   导航下拉面板（二级菜单）
   - 详情页中点"产品"显示产品切换列表
   - 详情页中点"联系"显示联系方式
   ============================================================ */
.nav-dd-panel {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  z-index: 999;
  background: rgba(17, 17, 34, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out-expo);
}

.nav-dd-panel.active {
  max-height: 320px;
  border-bottom: 1px solid var(--border-color);
}

.nav-dd-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
  padding: 16px 0;
}

.nav-dd-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  transition: background 0.25s, color 0.25s;
  cursor: pointer;
}

.nav-dd-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.nav-dd-item i {
  width: 20px;
  text-align: center;
  font-size: 1rem;
  color: var(--primary);
}

@media (max-width: 768px) {
  .nav-dd-panel {
    top: 60px;
  }
  .nav-dd-grid {
    grid-template-columns: 1fr;
    padding: 12px 0;
  }
  .nav-dd-item {
    padding: 10px 16px;
  }
}


/* 汉堡菜单按钮（移动端） */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* ============================================================
   4. Hero 首屏
   - 100vh 全屏高度
   - 背景包含网格线 + 发光球体
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* 网格线背景（纯 CSS 绘制） */
.grid-overlay {
  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;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* 发光球体装饰 */
.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  pointer-events: none;
}

.glow-orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--primary), transparent 70%);
  top: -200px;
  right: -150px;
  animation: orbFloat 20s ease-in-out infinite alternate;
}

.glow-orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent), transparent 70%);
  bottom: -100px;
  left: -100px;
  animation: orbFloat 25s ease-in-out infinite alternate-reverse;
}

@keyframes orbFloat {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(60px, -80px) scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding-bottom: 60px;  /* 为底部滚动指示器留出空间 */
}

.hero-badge {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--primary-light);
  padding: 8px 20px;
  border: 1px solid rgba(0,102,255,0.2);
  border-radius: 100px;
  margin-bottom: 28px;
  background: rgba(0,102,255,0.06);
  backdrop-filter: blur(8px);
  animation: fadeInUp 0.8s ease backwards;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}

.title-line {
  display: block;
  animation: fadeInUp 0.8s 0.15s ease backwards;
}

.title-accent {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 50%, #f0f0ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s 0.3s ease backwards;
}

.br-desktop {
  display: block;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s 0.45s ease backwards;
}

/* 滚动指示器 */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  z-index: 2;
  animation: fadeIn 1s 1s ease backwards;
  pointer-events: none;  /* 不干扰按钮点击 */
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50%      { opacity: 1;   transform: scaleY(1.3); }
}

/* ============================================================
   5. 通用 Section 样式
   ============================================================ */
.section {
  padding: var(--section-py) 0;
  position: relative;
}

/* 交替背景色 */
.specs-section,
.cta-section {
  background: var(--bg-mid);
}

/* ============================================================
   6. 产品展示区（Products Grid）
   - ★ 核心布局：grid-template-columns 控制每行卡片数量
   - 当前为 2 列（repeat(2, 1fr)）
   - 如需改为 3 列：将 repeat(2, 1fr) 改为 repeat(3, 1fr)
     但建议相应缩小卡片内边距和图片尺寸
   - ★ 如果卡片数量不是 4 的倍数，最后一行会自动左对齐
   ============================================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* 产品卡片 */
.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  overflow: hidden;
  transition: all 0.5s var(--ease-out-expo);
  position: relative;
  cursor: pointer;
}

/* 卡片悬停效果：上浮 + 发光边框 */
.product-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow:
    0 20px 60px rgba(0,0,0,0.4),
    0 0 0 1px rgba(0,102,255,0.15),
    0 0 30px rgba(0,102,255,0.1);
}

/* 卡片图片区域 */
.card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--bg-dark) 100%);
  overflow: hidden;
}

/* ★ 产品卡片图片
     将真实产品图片放入 images/products/ 目录（推荐 600×400px）
     <img> 加载成功时覆盖图标，加载失败时显示图标后备 */
.card-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease-out-expo);
  z-index: 1;
}

.product-card:hover .card-image img {
  transform: scale(1.05);
}

/* 图片加载成功时隐藏图标 */
.card-image img:not([src=""]) {
  display: block;
}

.card-image img:not([src=""]) ~ .card-image-icon {
  opacity: 0;
}

/* 跟随鼠标的径向光晕（由 script.js 驱动） */
.card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(400px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
              rgba(0,102,255,0.08) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 2;
}

.product-card:hover .card-image::before {
  opacity: 1;
}

/* ★ 产品卡片图标后备（图片不存在时显示）
     修改 <i> 的 class 可更换图标
     常用：fa-microchip（芯片）、fa-cpu（CPU）、fa-server（服务器） */
.card-image-icon {
  font-size: 4rem;
  color: rgba(0,102,255,0.15);
  transition: all 0.6s var(--ease-out-expo);
  z-index: 0;
}

.product-card:hover .card-image-icon {
  color: rgba(0,102,255,0.35);
  transform: scale(1.1) rotate(-5deg);
}

/* 图片发光遮罩（悬停时渐显） */
.card-image-glow {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,102,255,0.1), transparent 50%);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

.product-card:hover .card-image-glow {
  opacity: 1;
}

/* 卡片内容区 */
.card-body {
  padding: 28px;
}

.card-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: var(--primary-light);
  background: rgba(0,102,255,0.08);
  border: 1px solid rgba(0,102,255,0.15);
  border-radius: 100px;
  text-transform: uppercase;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--primary-light);
  transition: gap 0.3s ease;
}

.card-link i {
  font-size: 0.8em;
  transition: transform 0.3s ease;
}

.product-card:hover .card-link i {
  transform: translateX(4px);
}

/* ============================================================
   7. 技术指标区（Specs）
   - 数据数字动画
   - 4 列网格布局
   ============================================================ */
.specs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.spec-item {
  text-align: center;
  padding: 40px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  transition: all var(--transition);
}

.spec-item:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}

.spec-number {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline;
}

.spec-unit {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-left: 2px;
  display: inline;
}

.spec-label {
  margin-top: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ============================================================
   8. 品牌介绍区（About）
   - 左右两栏（about-grid）：左侧文字，右侧几何装饰
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-text .section-label {
  margin-bottom: 16px;
}

.about-text .section-title {
  margin-bottom: 24px;
}

.about-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

/* 引用块 */
.about-quote {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  padding: 20px 24px;
  background: rgba(0,102,255,0.04);
  border-left: 3px solid var(--primary);
  border-radius: 0 12px 12px 0;
}

.about-quote i {
  color: var(--primary-light);
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.about-quote blockquote {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--text-primary);
  font-weight: 500;
}

/* 右侧几何装饰 */
.about-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

.geo-shapes {
  position: relative;
  width: 300px;
  height: 300px;
}

.geo {
  position: absolute;
  border-radius: 50%;
  opacity: 0.6;
  transition: transform 0.8s var(--ease-out-expo);
}

.geo-1 {
  width: 200px;
  height: 200px;
  top: 0;
  left: 0;
  background: radial-gradient(circle, rgba(0,102,255,0.15), transparent 70%);
  border: 1px solid rgba(0,102,255,0.2);
  animation: geoSpin 30s linear infinite;
}

.geo-2 {
  width: 140px;
  height: 140px;
  bottom: 20px;
  right: 0;
  background: radial-gradient(circle, rgba(168,85,247,0.12), transparent 70%);
  border: 1px solid rgba(168,85,247,0.2);
  animation: geoSpin 25s linear infinite reverse;
}

.geo-3 {
  width: 80px;
  height: 80px;
  bottom: 80px;
  left: 40px;
  background: radial-gradient(circle, rgba(0,102,255,0.2), transparent 70%);
  animation: geoPulse 4s ease-in-out infinite;
}

.geo-4 {
  width: 50px;
  height: 50px;
  top: 60px;
  right: 40px;
  border: 2px solid rgba(168,85,247,0.3);
  background: transparent;
  animation: geoFloat 6s ease-in-out infinite;
}

@keyframes geoSpin {
  0%   { transform: rotate(0deg) translateX(10px) rotate(0deg); }
  100% { transform: rotate(360deg) translateX(10px) rotate(-360deg); }
}

@keyframes geoPulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50%      { transform: scale(1.3); opacity: 0.8; }
}

@keyframes geoFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-20px); }
}

/* ============================================================
   9. CTA 行动召唤区
   ============================================================ */
.cta-box {
  text-align: center;
  padding: 80px 40px;
  background: linear-gradient(135deg,
    rgba(0,102,255,0.06) 0%,
    rgba(168,85,247,0.04) 100%);
  border: 1px solid var(--border-color);
  border-radius: 28px;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(0,102,255,0.03), transparent 50%);
  animation: ctaGlow 10s ease-in-out infinite alternate;
}

@keyframes ctaGlow {
  0%   { transform: translate(0, 0); }
  100% { transform: translate(-30px, 30px); }
}

.cta-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
}

.cta-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 36px;
  position: relative;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
}

/* ============================================================
   10. 页脚（Footer）
   ============================================================ */
.footer {
  padding: 80px 0 32px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-mid);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-logo-text {
  display: block;
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ★ 如需在页脚使用图片 Logo，取消下方注释并注释掉上面的 .footer-logo-text */
/* .footer-logo {
  height: 24px;
  width: auto;
  margin-bottom: 12px;
} */

.footer-tagline {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 24px;
}

.social-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.social-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 56px;
  padding: 8px 0;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  transition: all var(--transition);
  font-size: 1.1rem;
  text-decoration: none;
}

.social-link i {
  font-size: 1.2rem;
}

.social-label {
  font-size: 0.6rem;
  letter-spacing: 0.5px;
  white-space: nowrap;
  color: var(--text-muted);
}

.social-link:hover {
  color: var(--primary-light);
  border-color: var(--primary);
  background: rgba(0,102,255,0.08);
  transform: translateY(-2px);
}

.social-link:hover .social-label {
  color: var(--primary-light);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ============================================================
   产品详情页（Product Detail）
   - 默认隐藏（display: none），由 JS 切换显示
   - 页面内切换，不跳转新 URL
   ============================================================ */

.product-detail {
  display: none;                /* 默认隐藏 */
  position: relative;
  z-index: 10;
  padding: 100px 0 80px;
  min-height: 100vh;
  background: var(--bg-dark);
}

.product-detail.active {
  display: block;               /* JS 切换时显示 */
}

/* 背景装饰光晕 */
.detail-backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.detail-backdrop::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,102,255,0.06), transparent 70%);
  top: -100px;
  right: -100px;
  border-radius: 50%;
}

/* 返回按钮 */
.detail-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 40px;
}

.detail-back-btn:hover {
  color: var(--text-primary);
  border-color: var(--primary);
  background: rgba(0,102,255,0.08);
  transform: translateX(-4px);
}

/* 产品大图 */
.detail-header {
  margin-bottom: 48px;
}

.detail-image {
  position: relative;
  width: 100%;
  aspect-ratio: 2 / 1;
  border-radius: 20px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-dark));
  display: flex;
  align-items: center;
  justify-content: center;
}

.detail-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
}

.detail-img-fallback {
  font-size: 5rem;
  color: rgba(0,102,255,0.12);
}

.detail-image img:not([src=""]) ~ .detail-img-fallback {
  display: none;
}

/* 详情主体（两栏布局） */
.detail-body {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

/* 左栏 — 产品信息 */
.detail-info .detail-tags {
  margin-bottom: 16px;
}

.detail-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  line-height: 1.1;
}

.detail-tagline {
  color: var(--primary-light);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 32px;
}

.detail-description h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.detail-description p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

/* 右栏 — 规格与特性 */
.detail-specs h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 20px;
  padding-top: 0;
}

.specs-table {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 32px;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
}

.spec-row:last-child {
  border-bottom: none;
}

.spec-key {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.spec-val {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: right;
}

/* 特性列表 */
.detail-features {
  margin-bottom: 32px;
}

.detail-features h2 {
  margin-bottom: 16px;
}

.detail-features ul {
  list-style: none;
  padding: 0;
}

.detail-features li {
  position: relative;
  padding: 10px 0 10px 28px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  border-bottom: 1px solid var(--border-color);
}

.detail-features li:last-child {
  border-bottom: none;
}

.detail-features li::before {
  content: '\f00c';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  left: 0;
  top: 10px;
  color: var(--primary-light);
  font-size: 0.8rem;
}

/* ============================================================
   弹窗（Toast/Overlay）
   - 点击"技术""关于"时弹出
   ============================================================ */

.toast-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
}

.toast-overlay.active {
  display: flex;
}

.toast-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 48px 40px 36px;
  text-align: center;
  max-width: 380px;
  width: 90%;
  animation: toastIn 0.4s var(--ease-out-expo) backwards;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.toast-icon {
  font-size: 2.5rem;
  color: var(--primary-light);
  margin-bottom: 16px;
}

.toast-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.toast-btn {
  padding: 10px 32px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
}

.toast-btn:hover {
  border-color: var(--primary);
  background: rgba(0,102,255,0.08);
}

/* ============================================================ */
   11. 滚动动画类（AOS - Animation On Scroll）
   - 元素默认隐藏，滚动到可视区域后渐显/上移
   - ★ 如需调整动画效果：
     在 script.js 的 intersectionObserver 配置中修改
     threshold（触发阈值）和 rootMargin（提前量）
   ============================================================ */

/* 基础隐藏状态 */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out-expo),
              transform 0.8s var(--ease-out-expo);
}

/* 可见状态（由 JS 添加 .visible 类触发） */
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 从左侧滑入 */
.fade-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s var(--ease-out-expo),
              transform 0.8s var(--ease-out-expo);
}

.fade-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* 缩放入场 */
.scale-in {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.8s var(--ease-out-expo),
              transform 0.8s var(--ease-out-expo);
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* ============================================================
   12. 响应式（Media Queries）
   - 断点：1024px（平板）、768px（手机）、480px（小屏手机）
   ============================================================ */

/* 平板 ≤ 1024px */
@media (max-width: 1024px) {
  :root {
    --section-py: 80px;
  }

  .products-grid {
    gap: 20px;
  }

  .about-grid {
    gap: 40px;
  }

  .specs-grid {
    gap: 20px;
  }
}

/* 手机 ≤ 768px */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(8,8,14,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 24px;
    transition: right 0.4s var(--ease-out-expo);
    padding: 40px;
    border-left: 1px solid var(--border-color);
    z-index: 1001;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-link {
    font-size: 1.1rem;
  }

  .hamburger {
    display: flex;
    z-index: 1002;
  }

  /* 汉堡按钮动画 */
  .hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Hero */
  .br-desktop {
    display: none;
  }

  .hero-title {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  /* 产品区：改为单列 */
  .products-grid {
    grid-template-columns: 1fr;
  }

  /* 技术指标：2列 */
  .specs-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* About：改为单列，几何装饰缩小 */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-visual {
    min-height: 250px;
  }

  .geo-shapes {
    width: 200px;
    height: 200px;
  }

  .geo-1 {
    width: 140px;
    height: 140px;
  }

  .geo-2 {
    width: 100px;
    height: 100px;
  }

  .geo-3 {
    width: 60px;
    height: 60px;
  }

  .geo-4 {
    width: 40px;
    height: 40px;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }

  .cta-box {
    padding: 48px 24px;
  }

  /* Section 标题 */
  .section-header {
    margin-bottom: 40px;
  }

  /* 详情页响应式 */
  .detail-body {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .detail-image {
    aspect-ratio: 16 / 9;
  }

  .detail-title {
    font-size: 1.8rem;
  }

  .product-detail {
    padding: 80px 0 60px;
  }
}

/* 小屏手机 ≤ 480px */
@media (max-width: 480px) {
  .specs-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }

  .card-body {
    padding: 20px;
  }
}

/* ============================================================
   入场关键帧动画
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}