/* ==========================================================================
   全站主样式 - 蓝色科技风 / 高端简约 / 响应式
   行业：直播场景搭建、演播室搭建、直播设备租赁
   ========================================================================== */

/* ---------- 1. 设计变量（CSS 变量统一管理，方便后期维护） ---------- */
:root {
  /* 主色：深蓝渐变系列 */
  --color-primary-dark: #0a2540;     /* 深邃藏蓝，用于导航/Hero 背景 */
  --color-primary: #0d3b66;          /* 主蓝，按钮/标题主色 */
  --color-primary-mid: #1565c0;      /* 中蓝，渐变过渡 */
  --color-primary-light: #2196f3;    /* 亮蓝，hover/链接 */
  --color-accent: #00d4ff;           /* 青色科技光，高光/图标 */
  --color-accent-2: #7eb8ff;         /* 淡蓝辅助光 */

  /* 中性色 */
  --color-bg: #f5f8fc;               /* 页面整体背景，浅冷灰 */
  --color-bg-alt: #eef4fb;           /* 区块交替背景 */
  --color-white: #ffffff;
  --color-text: #1a2a4a;             /* 主文字 */
  --color-text-light: #5a6a85;       /* 次文字 */
  --color-text-mute: #8a98ad;        /* 辅助文字 */
  --color-border: #e1e8f0;           /* 边框/分隔线 */

  /* 渐变（核心科技质感） */
  --grad-primary: linear-gradient(135deg, #0a2540 0%, #0d3b66 45%, #1565c0 100%);
  --grad-blue: linear-gradient(135deg, #2196f3 0%, #00d4ff 100%);
  --grad-soft: linear-gradient(135deg, #eef4fb 0%, #dde9f7 100%);

  /* 阴影（分层营造立体感） */
  --shadow-sm: 0 2px 8px rgba(13, 59, 102, 0.06);
  --shadow-md: 0 6px 24px rgba(13, 59, 102, 0.10);
  --shadow-lg: 0 12px 40px rgba(13, 59, 102, 0.16);
  --shadow-glow: 0 8px 30px rgba(33, 150, 243, 0.25);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* 容器最大宽度 */
  --container-max: 1200px;

  /* 过渡 */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 2. 全局重置 / 基础样式 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth; /* 全站滚动平滑 */
  font-size: 16px;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

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

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

ul, ol { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* 通用容器：内容居中、左右留白 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* 通用区块间距 */
.section {
  padding: 80px 0;
}

.section--alt { background: var(--color-bg-alt); }

.section--dark {
  background: var(--grad-primary);
  color: var(--color-white);
}

/* ---------- 3. 通用标题 / 段落 ---------- */
.section-title {
  text-align: center;
  margin-bottom: 56px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -10px;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: var(--grad-blue);
  border-radius: 2px;
}

.section-title p {
  color: var(--color-text-light);
  font-size: 15px;
  margin-top: 18px;
}

.section--dark .section-title h2 { color: var(--color-white); }
.section--dark .section-title p { color: rgba(255, 255, 255, 0.75); }

/* 通用按钮 */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--transition);
  text-align: center;
  cursor: pointer;
}

.btn-primary {
  background: var(--grad-blue);
  color: var(--color-white);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(33, 150, 243, 0.4);
  color: var(--color-white);
}

.btn-outline {
  border: 1.5px solid var(--color-white);
  color: var(--color-white);
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
}

.btn-ghost {
  border: 1.5px solid var(--color-primary-light);
  color: var(--color-primary-light);
  background: transparent;
}

.btn-ghost:hover {
  background: var(--color-primary-light);
  color: var(--color-white);
}

/* ---------- 4. 顶部导航（统一样式，所有页面共用） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--grad-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 18px;
  box-shadow: var(--shadow-glow);
}

.logo-text span {
  font-size: 12px;
  color: var(--color-text-light);
  font-weight: 400;
  display: block;
  margin-top: -2px;
}

/* 主导航 */
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list > li { position: relative; }

.nav-list > li > a {
  display: block;
  padding: 10px 16px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: 8px;
  transition: all var(--transition);
  position: relative;
}

.nav-list > li > a:hover,
.nav-list > li.active > a {
  color: var(--color-primary-light);
  background: rgba(33, 150, 243, 0.06);
}

/* 带二级菜单的项：箭头 */
.nav-list > li.has-sub > a::after {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 6px;
  vertical-align: middle;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid currentColor;
  opacity: 0.6;
}

/* 二级菜单（默认隐藏，hover 展开） */
.subnav {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition);
  z-index: 10;
}

.has-sub:hover .subnav {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.subnav li a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: 6px;
  transition: all var(--transition);
}

.subnav li a:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary-light);
  padding-left: 20px;
}

/* 导航右侧电话 */
.header-phone {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--grad-soft);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 600;
}

.header-phone::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary-light);
  box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.2);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.2); }
  50%      { box-shadow: 0 0 0 8px rgba(33, 150, 243, 0.05); }
}

/* 移动端汉堡菜单按钮（默认隐藏） */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--color-bg-alt);
  position: relative;
}

.menu-toggle span {
  position: absolute;
  left: 10px;
  right: 10px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.menu-toggle span:nth-child(1) { top: 13px; }
.menu-toggle span:nth-child(2) { top: 19px; }
.menu-toggle span:nth-child(3) { top: 25px; }

/* 激活态：变成 X */
.menu-toggle.active span:nth-child(1) {
  top: 19px;
  transform: rotate(45deg);
}
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) {
  top: 19px;
  transform: rotate(-45deg);
}

/* ---------- 5. Hero / Banner 区 ---------- */
.hero {
  position: relative;
  min-height: 560px;
  background: var(--grad-primary);
  color: var(--color-white);
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 80px 0;
}

/* 科技光斑：伪元素营造光影 */
.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  pointer-events: none;
}

.hero::before {
  width: 480px;
  height: 480px;
  background: var(--color-accent);
  top: -180px;
  right: -120px;
}

.hero::after {
  width: 360px;
  height: 360px;
  background: var(--color-primary-light);
  bottom: -160px;
  left: -80px;
  opacity: 0.3;
}

/* 科技线条装饰 */
.hero-deco {
  position: absolute;
  inset: 0;
  background-image:
      linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 20px;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.hero-text h1 span {
  background: linear-gradient(90deg, #ffffff 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-text p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  height: 360px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  overflow: hidden;
  backdrop-filter: blur(10px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.3);
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 较小的页面顶部 banner（内页通用） */
.page-banner {
  position: relative;
  padding: 100px 0 80px;
  background: var(--grad-primary);
  color: var(--color-white);
  text-align: center;
  overflow: hidden;
}

.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
      linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(180deg, black 0%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, black 0%, transparent 100%);
}

.page-banner h1 {
  position: relative;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-banner .breadcrumb {
  position: relative;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.page-banner .breadcrumb a:hover { color: var(--color-accent); }

/* ---------- 6. 卡片（通用样式，hover 微光悬浮） ---------- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
  position: relative;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(33, 150, 243, 0.3);
}

/* 卡片顶部彩色光带（科技风装饰） */
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}

.card:hover::before { transform: scaleX(1); }

.card-img {
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: var(--grad-soft);
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.card:hover .card-img img { transform: scale(1.08); }

.card-body {
  padding: 24px;
}

.card-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
  transition: color var(--transition);
}

.card:hover .card-body h3 { color: var(--color-primary-light); }

.card-body p {
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--color-primary-light);
  font-weight: 500;
}

.card-link::after {
  content: "→";
  transition: transform var(--transition);
}

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

/* ---------- 7. 网格系统 ---------- */
.grid {
  display: grid;
  gap: 28px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 8. 特色服务 / 数据统计 ---------- */
.feature-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.feature-item {
  text-align: center;
  padding: 32px 16px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

.feature-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  border-radius: 14px;
  background: var(--grad-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-light);
  font-size: 26px;
  transition: all var(--transition);
}

.feature-item:hover .feature-icon {
  background: var(--grad-blue);
  color: var(--color-white);
  transform: rotateY(180deg);
}

.feature-item h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-primary-dark);
}

.feature-item p {
  font-size: 13px;
  color: var(--color-text-light);
}

/* 数据统计 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding: 56px 0;
}

.stat-item { text-align: center; color: var(--color-white); }

.stat-num {
  font-size: 42px;
  font-weight: 700;
  background: linear-gradient(90deg, #ffffff 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- 9. 关于我们 / 团队 ---------- */
.about-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-block.reverse { direction: rtl; }
.about-block.reverse > * { direction: ltr; }

.about-block img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.about-text h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 18px;
}

.about-text h2 span { color: var(--color-primary-light); }

.about-text p {
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.about-text .btn { margin-top: 12px; }

/* 团队卡片 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  text-align: center;
  padding: 28px 20px;
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

.team-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.team-avatar {
  width: 110px;
  height: 110px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--grad-soft);
  overflow: hidden;
  border: 4px solid var(--color-white);
  box-shadow: 0 8px 20px rgba(33, 150, 243, 0.2);
}

.team-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-card h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 4px;
}

.team-card .role {
  font-size: 13px;
  color: var(--color-primary-light);
  margin-bottom: 12px;
}

.team-card p {
  font-size: 13px;
  color: var(--color-text-light);
}

/* ---------- 10. 联系我们页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info {
  background: var(--grad-primary);
  color: var(--color-white);
  padding: 40px;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.contact-info::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--color-accent);
  filter: blur(60px);
  opacity: 0.3;
}

.contact-info h2 {
  font-size: 26px;
  margin-bottom: 12px;
  position: relative;
}

.contact-info > p {
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 32px;
  position: relative;
}

.contact-list {
  position: relative;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-item:last-child { border-bottom: none; }

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 400;
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 18px;
  font-weight: 600;
}

/* 表单 */
.contact-form {
  background: var(--color-white);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.contact-form h2 {
  font-size: 24px;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.contact-form > p {
  color: var(--color-text-light);
  margin-bottom: 28px;
  font-size: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 6px;
  font-weight: 500;
}

.form-group label.required::after {
  content: " *";
  color: #ff5252;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  transition: all var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

.form-submit {
  width: 100%;
  padding: 14px;
  background: var(--grad-blue);
  color: var(--color-white);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--transition);
  box-shadow: var(--shadow-glow);
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(33, 150, 243, 0.4);
}

/* 表单提交提示（前端模拟） */
.form-tip {
  margin-top: 16px;
  padding: 12px;
  background: rgba(33, 150, 243, 0.08);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-size: 13px;
  text-align: center;
  display: none;
}

.form-tip.show { display: block; }

/* ---------- 11. 案例展示 ---------- */
.case-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.case-tab {
  padding: 10px 24px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 30px;
  font-size: 14px;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
}

.case-tab:hover,
.case-tab.active {
  background: var(--grad-blue);
  color: var(--color-white);
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

/* ---------- 12. 解决方案特色介绍 ---------- */
.solution-block {
  margin-bottom: 80px;
}

.solution-block:last-child { margin-bottom: 0; }

.solution-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 40px;
}

.solution-head.reverse { direction: rtl; }
.solution-head.reverse > * { direction: ltr; }

.solution-head .num {
  font-size: 72px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 16px;
}

.solution-head h3 {
  font-size: 28px;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.solution-head p {
  color: var(--color-text-light);
  font-size: 15px;
}

.solution-head .visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  height: 280px;
}

.solution-head .visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-row .item {
  padding: 20px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary-light);
}

.feature-row .item h5 {
  font-size: 15px;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
  font-weight: 600;
}

.feature-row .item p {
  font-size: 13px;
  color: var(--color-text-light);
}

/* ---------- 13. 服务项目列表 ---------- */
.service-block {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  transition: all var(--transition);
}

.service-block:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
  border-color: rgba(33, 150, 243, 0.2);
}

.service-block .num-badge {
  width: 240px;
  height: 200px;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  background: var(--grad-soft);
}

.service-block .num-badge img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.service-block .num-badge::after {
  content: attr(data-num);
  position: absolute;
  top: 16px;
  left: 16px;
  width: 40px;
  height: 40px;
  background: var(--grad-blue);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  box-shadow: var(--shadow-glow);
}

.service-content h3 {
  font-size: 22px;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.service-content p {
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.service-tag {
  padding: 6px 14px;
  background: var(--color-bg-alt);
  color: var(--color-primary);
  font-size: 13px;
  border-radius: 20px;
  border: 1px solid var(--color-border);
}

/* 设备租赁 - 价格卡片 */
.rental-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.rental-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.rental-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--grad-blue);
}

.rental-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.rental-card .img-wrap {
  width: 100%;
  height: 160px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
  background: var(--grad-soft);
}

.rental-card .img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.rental-card h4 {
  font-size: 17px;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.rental-card .desc {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.rental-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 12px;
}

.rental-price .price {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary-light);
}

.rental-price .unit {
  font-size: 13px;
  color: var(--color-text-light);
}

.rental-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.rental-spec {
  padding: 4px 10px;
  background: var(--color-bg-alt);
  font-size: 12px;
  color: var(--color-text);
  border-radius: 4px;
}

/* ---------- 14. CTA 区（行动召唤） ---------- */
.cta {
  padding: 80px 0;
  background: var(--grad-primary);
  color: var(--color-white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
      linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.cta h2 {
  font-size: 32px;
  margin-bottom: 16px;
  position: relative;
}

.cta p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 32px;
  position: relative;
}

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

/* ---------- 15. 页脚 ---------- */
.site-footer {
  background: #061a30;
  color: rgba(255, 255, 255, 0.65);
  padding: 56px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h5 {
  color: var(--color-white);
  font-size: 15px;
  margin-bottom: 18px;
  font-weight: 600;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h5::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  background: var(--color-primary-light);
}

.footer-col p {
  font-size: 13px;
  line-height: 1.8;
  margin-bottom: 12px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
  transition: all var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.footer-contact-item {
  display: flex;
  gap: 8px;
  font-size: 13px;
  margin-bottom: 8px;
}

.footer-contact-item .label {
  color: rgba(255, 255, 255, 0.5);
  min-width: 50px;
}

.qrcode {
  width: 100px;
  height: 100px;
  background: var(--color-white);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
  font-size: 11px;
  color: var(--color-text-light);
  overflow: hidden;
}

.qrcode img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  text-align: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
}

.footer-bottom a:hover { color: var(--color-accent); }

/* ---------- 16. 滚动入场效果 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 17. 响应式：平板 ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { height: 320px; }
  .hero-text h1 { font-size: 36px; }

  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .feature-list { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 24px; }

  .about-block,
  .solution-head,
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }

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

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

  .service-block {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .service-block .num-badge {
    width: 100%;
    height: 220px;
  }

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

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

/* ---------- 18. 响应式：手机 ---------- */
@media (max-width: 768px) {
  html { font-size: 15px; }

  .section { padding: 56px 0; }
  .container { padding: 0 16px; }

  /* 导航：变成汉堡菜单 */
  .nav-wrap {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-white);
    padding: 16px;
    box-shadow: var(--shadow-lg);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.4s ease;
    z-index: 999;
  }

  .nav-wrap.open { transform: translateX(0); }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-list > li > a { padding: 12px 16px; }

  /* 手机端二级菜单展开式 */
  .subnav {
    position: static;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    padding: 0 0 0 16px;
    display: none;
    background: var(--color-bg-alt);
    border-radius: 8px;
    margin-top: 4px;
  }
  .has-sub.open .subnav { display: block; }
  .has-sub > a::after { display: none; }

  /* 手机端给有子项的菜单项加个 + - 标记 */
  .has-sub > a {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .has-sub > a::before {
    content: "+";
    font-size: 18px;
    color: var(--color-primary-light);
  }
  .has-sub.open > a::before { content: "−"; }

  .menu-toggle { display: flex; align-items: center; justify-content: center; }
  .header-phone { display: none; }

  /* Hero */
  .hero { min-height: auto; padding: 60px 0 40px; }
  .hero-text h1 { font-size: 28px; }
  .hero-text p { font-size: 15px; }
  .hero-visual { height: 240px; }

  .page-banner { padding: 72px 0 56px; }
  .page-banner h1 { font-size: 26px; }

  /* 标题 */
  .section-title h2 { font-size: 24px; }
  .section-title { margin-bottom: 36px; }

  /* 网格全部变单列 */
  .grid-2,
  .grid-3,
  .grid-4,
  .feature-list,
  .stats,
  .feature-row,
  .team-grid,
  .rental-grid,
  .form-row { grid-template-columns: 1fr; }

  /* 案例筛选 */
  .case-tabs { gap: 8px; }
  .case-tab { padding: 8px 16px; font-size: 13px; }

  /* 联系 */
  .contact-info,
  .contact-form { padding: 24px; }
  .contact-item p { font-size: 16px; }

  /* CTA */
  .cta { padding: 56px 0; }
  .cta h2 { font-size: 24px; }

  /* 页脚 */
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .site-footer { padding: 40px 0 0; }

  /* 服务区块 */
  .service-block { padding: 20px; }
  .service-content h3 { font-size: 18px; }

  /* 解决方案 */
  .solution-head { gap: 20px; margin-bottom: 28px; }
  .solution-head .num { font-size: 48px; }
  .solution-head h3 { font-size: 22px; }
  .solution-head .visual { height: 200px; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .cta-actions { flex-direction: column; }
  .cta-actions .btn { width: 100%; }
}

/* ---------- 19. 滚动条美化（可选细节） ---------- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb {
  background: var(--color-primary-mid);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }