/* ============================================
   CSS 变量系统 - 企业级设计系统
   ============================================ */

:root {
  /* 颜色系统 */
  --color-primary: #58A6FF;
  --color-primary-dark: #1F6FEB;
  --color-primary-light: #8BD0FF;
  --color-accent: #FFB347;
  --color-accent-dark: #F59E0B;
  --color-accent-light: #FFD191;
  
  --color-text-dark: #E5E7EB;
  --color-text-light: #F8FAFC;
  --color-text-muted: #9CA3AF;
  --color-text-light-muted: #94A3B8;
  --color-text: #E5E7EB;
  
  --color-background-light: #0F172A;
  --color-background-white: #0D1117;
  --color-background-dark: #0B1220;
  --color-background-darker: #070B16;
  --color-surface-card: #161B22;
  
  --color-border: #1F2937;
  --color-border-dark: #111827;
  
  --color-success: #22C55E;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #0EA5E9;

  --glow-white: rgba(255, 255, 255, 0.82);
  --glow-warm: rgba(255, 179, 71, 0.72);
  --glow-red: rgba(255, 100, 100, 0.68);
  --grid-line: rgba(255, 255, 255, 0.04);
  
  /* 字体系统 */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-family-heading: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-mono: 'Monaco', 'Menlo', 'Courier New', monospace;
  
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 28px;
  --font-size-4xl: 32px;
  --font-size-5xl: 40px;
  --font-size-6xl: 48px;
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.8;
  
  /* 间距系统 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-2xl: 32px;
  --spacing-3xl: 48px;
  --spacing-4xl: 64px;
  --spacing-5xl: 80px;
  
  /* 圆角系统 */
  --radius-none: 0;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* 阴影系统 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.15);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.06);
  
  /* 过渡效果 */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* 媒体查询断点 */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* ============================================
   全局重置和基础样式
   ============================================ */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-dark);
  background-color: var(--color-background-darker);
  background-image: radial-gradient(circle at 20% 20%, rgba(88, 166, 255, 0.08), transparent 25%), radial-gradient(circle at 80% 0%, rgba(255, 179, 71, 0.06), transparent 30%);
  overflow-x: hidden;
}

/* ============================================
   排版样式
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-light);
}

h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-2xl);
}

h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-xl);
}

h3 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
}

h4 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-md);
}

h5 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

h6 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
}

p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-muted);
}

p:last-child {
  margin-bottom: 0;
}

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

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

strong {
  font-weight: var(--font-weight-bold);
}

em {
  font-style: italic;
}

/* ============================================
   列表样式
   ============================================ */

ul, ol {
  margin-left: var(--spacing-2xl);
  margin-bottom: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-md);
}

/* ============================================
   表格样式
   ============================================ */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-2xl);
  border: 1px solid var(--color-border);
}

thead {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

th {
  padding: var(--spacing-lg);
  text-align: left;
  font-weight: var(--font-weight-bold);
}

td {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

tbody tr:hover {
  background-color: var(--color-background-light);
}

/* ============================================
   按钮样式
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  letter-spacing: 0.2px;
  border: 1px solid transparent;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(130deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-light);
  box-shadow: 0 10px 30px rgba(88, 166, 255, 0.25);
  border-color: rgba(88, 166, 255, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(130deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
  box-shadow: 0 15px 36px rgba(88, 166, 255, 0.35);
  transform: translateY(-1px);
}

.btn-accent {
  background: linear-gradient(130deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  color: var(--color-background-darker);
  box-shadow: 0 10px 30px rgba(255, 179, 71, 0.32), 0 0 16px rgba(255, 179, 71, 0.35);
  border-color: rgba(255, 179, 71, 0.45);
}

.btn-accent:hover {
  background: linear-gradient(130deg, var(--color-accent-light) 0%, var(--color-accent) 100%);
  box-shadow: 0 14px 34px rgba(255, 179, 71, 0.45);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  box-shadow: 0 8px 26px rgba(88, 166, 255, 0.32);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
}

/* ============================================
   容器和布局
   ============================================ */

.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

.container-fluid {
  width: 100%;
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

.row {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.col-1 { grid-column: span 1; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

/* ============================================
   响应式网格 - 平板设备
   ============================================ */

@media (max-width: 1024px) {
  .col-1 { grid-column: span 1; }
  .col-2 { grid-column: span 2; }
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 6; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 12; }
  .col-8 { grid-column: span 8; }
  .col-9 { grid-column: span 12; }
  .col-10 { grid-column: span 12; }
  .col-11 { grid-column: span 12; }
  .col-12 { grid-column: span 12; }
}

/* ============================================
   响应式网格 - 手机设备
   ============================================ */

@media (max-width: 768px) {
  .col-1 { grid-column: span 1; }
  .col-2 { grid-column: span 2; }
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 6; }
  .col-5 { grid-column: span 6; }
  .col-6 { grid-column: span 12; }
  .col-7 { grid-column: span 12; }
  .col-8 { grid-column: span 12; }
  .col-9 { grid-column: span 12; }
  .col-10 { grid-column: span 12; }
  .col-11 { grid-column: span 12; }
  .col-12 { grid-column: span 12; }
  
  h1 {
    font-size: var(--font-size-4xl);
  }
  
  h2 {
    font-size: var(--font-size-3xl);
  }
}

/* ============================================
   图片样式
   ============================================ */

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

.img-responsive {
  width: 100%;
  height: auto;
}

.img-rounded {
  border-radius: var(--radius-md);
}

.img-circle {
  border-radius: 50%;
}

.img-shadow {
  box-shadow: var(--shadow-lg);
}

/* ============================================
   卡片组件
   ============================================ */

.card {
  background: linear-gradient(160deg, #0f1624 0%, #0d1117 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  position: relative;
}

.card:hover {
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45), 0 0 24px rgba(88, 166, 255, 0.08);
  transform: translateY(-4px);
  border-color: rgba(88, 166, 255, 0.25);
}

.card-header {
  padding: var(--spacing-xl);
  background: linear-gradient(120deg, rgba(88, 166, 255, 0.18), rgba(13, 17, 23, 0.95));
  color: var(--color-text-light);
  border-bottom: 1px solid var(--color-border);
}

.card-body {
  padding: var(--spacing-xl);
  color: var(--color-text-dark);
}

.card-footer {
  padding: var(--spacing-lg);
  background-color: #0f1624;
  border-top: 1px solid var(--color-border);
}

.card-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

/* ============================================
   导航栏样式
   ============================================ */

nav {
  background: #0b1220;
  color: var(--color-text-light);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-2xl);
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

.navbar-brand {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-light);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  letter-spacing: 0.5px;
  white-space: nowrap;
  padding: var(--spacing-sm) var(--spacing-md);
  line-height: var(--line-height-tight);
}

.navbar-brand:hover {
  color: var(--color-accent);
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
  padding-top: 0;
}

.navbar-item {
  position: relative;
}

.navbar-link {
  color: var(--color-text-light);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-lg);
  padding: var(--spacing-sm) var(--spacing-md);
  line-height: var(--line-height-tight);
  display: block;
  transition: all var(--transition-fast);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.navbar-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* 下拉菜单 */
.dropdown {
  position: relative;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #0f172a;
  list-style: none;
  min-width: 200px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: var(--spacing-md);
}

.dropdown:hover .dropdown-menu {
  display: block;
}

.dropdown-item {
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-text-light);
  text-decoration: none;
  display: block;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background-color: rgba(88, 166, 255, 0.12);
  color: var(--color-accent);
  padding-left: var(--spacing-2xl);
}

/* ============================================
   页脚样式
   ============================================ */

footer {
  background: #0b1220;
  color: var(--color-text-light);
  padding: var(--spacing-3xl) var(--spacing-2xl);
  margin-top: var(--spacing-5xl);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-3xl);
}

.footer-section h3 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-lg);
}

.footer-section a {
  color: var(--color-text-light-muted);
  display: block;
  margin-bottom: var(--spacing-md);
  transition: all var(--transition-fast);
}

.footer-section a:hover {
  color: var(--color-accent);
  padding-left: var(--spacing-md);
}

.footer-bottom {
  border-top: 1px solid var(--color-border-dark);
  padding-top: var(--spacing-2xl);
  text-align: center;
  color: var(--color-text-light-muted);
}

/* ============================================
   英雄区域 (Hero Section)
   ============================================ */

.hero {
  background:
    radial-gradient(circle at 20% 25%, rgba(88, 166, 255, 0.18), transparent 32%),
    radial-gradient(circle at 82% 12%, rgba(255, 179, 71, 0.16), transparent 30%),
    #0b1220;
  color: var(--color-text-light);
  padding: var(--spacing-5xl) var(--spacing-2xl) var(--spacing-4xl);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.03) 50%, transparent 100%), linear-gradient(0deg, transparent 0%, rgba(255, 255, 255, 0.03) 50%, transparent 100%);
  background-size: 120px 120px;
  opacity: 0.5;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 40%, rgba(255, 255, 255, 0.06), transparent 50%);
  filter: blur(40px);
  opacity: 0.8;
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 1180px;
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  align-items: center;
  gap: var(--spacing-3xl);
}

.hero h1 {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-6xl);
  letter-spacing: 0.5px;
}

.hero p {
  color: var(--color-text-light-muted);
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-2xl);
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(88, 166, 255, 0.12);
  color: var(--color-primary-light);
  border: 1px solid rgba(88, 166, 255, 0.25);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-lg);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.hero-highlight {
  padding: var(--spacing-lg);
  background: rgba(22, 27, 34, 0.7);
  border: 1px solid rgba(88, 166, 255, 0.2);
  border-radius: var(--radius-lg);
  color: var(--color-text-dark);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.hero-highlight strong {
  display: block;
  color: var(--color-text-light);
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

.hero-visual {
  position: relative;
}

.glow-frame {
  position: relative;
  padding: var(--spacing-lg);
  background: linear-gradient(140deg, rgba(16, 23, 36, 0.9), rgba(11, 18, 32, 0.8));
  border-radius: var(--radius-2xl);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.55), 0 0 40px rgba(88, 166, 255, 0.18);
  overflow: hidden;
}

.glow-frame::before {
  content: '';
  position: absolute;
  inset: 14%;
  border-radius: var(--radius-2xl);
  background: radial-gradient(circle at 50% 50%, rgba(88, 166, 255, 0.14), transparent 60%);
  filter: blur(18px);
  z-index: 1;
}

.glow-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-2xl);
  border: 1px solid rgba(255, 255, 255, 0.05);
  z-index: 3;
}

.hero-image {
  position: relative;
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.55), 0 0 50px rgba(255, 255, 255, 0.08);
  margin: 0 auto;
  display: block;
  z-index: 2;
  filter: brightness(0.65) drop-shadow(0 0 0 rgba(255, 255, 255, 0));
  animation: headlightOn 2.4s ease forwards;
}

.hero-caption {
  margin-top: var(--spacing-lg);
  color: var(--color-text-light-muted);
  font-size: var(--font-size-sm);
  letter-spacing: 0.4px;
}

@keyframes headlightOn {
  0% {
    filter: brightness(0.25) drop-shadow(0 0 0 rgba(255, 255, 255, 0));
    opacity: 0.8;
  }
  40% {
    filter: brightness(0.65) drop-shadow(0 0 14px var(--glow-white));
  }
  70% {
    filter: brightness(1) drop-shadow(0 0 32px var(--glow-white));
  }
  100% {
    filter: brightness(1.05) drop-shadow(0 0 48px var(--glow-white));
  }
}

/* ============================================
   功能区域
   ============================================ */

.features {
  padding: var(--spacing-5xl) var(--spacing-2xl);
  background-color: var(--color-background-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.feature-card {
  background-color: var(--color-surface-card);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  position: relative;
}

.feature-card:hover {
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.45), 0 0 24px rgba(88, 166, 255, 0.08);
  transform: translateY(-8px);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-lg);
  color: var(--color-accent);
}

.feature-card h3 {
  margin-bottom: var(--spacing-md);
}

/* ============================================
   产品网格
   ============================================ */

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.product-card {
  position: relative;
  background: linear-gradient(150deg, rgba(15, 22, 36, 0.95), rgba(13, 17, 23, 0.95));
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.product-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 60% 30%, rgba(88, 166, 255, 0.14), transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.product-card:hover {
  box-shadow: 0 22px 48px rgba(0, 0, 0, 0.55), 0 0 32px rgba(88, 166, 255, 0.18);
  transform: translateY(-6px);
  border-color: rgba(88, 166, 255, 0.24);
}

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

.product-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 0 0 rgba(255, 255, 255, 0.1));
  transition: filter var(--transition-base), transform var(--transition-base);
}

.product-info {
  padding: var(--spacing-lg);
  position: relative;
  z-index: 2;
}

.product-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

.product-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
  line-height: var(--line-height-relaxed);
}

.product-card-glow:hover .product-image {
  filter: drop-shadow(0 0 40px var(--glow-white));
  transform: translateY(-2px) scale(1.01);
}

.taillight-card:hover .product-image {
  filter: drop-shadow(0 0 40px var(--glow-red));
}

/* ============================================
   通用分区与模块
   ============================================ */

.section {
  padding: var(--spacing-5xl) var(--spacing-2xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-md);
}

.section-header p {
  margin: 0 auto;
  max-width: 840px;
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-full);
  border: 1px solid rgba(88, 166, 255, 0.35);
  background: rgba(88, 166, 255, 0.08);
  color: var(--color-primary-light);
  font-size: var(--font-size-sm);
  letter-spacing: 0.2px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.stat-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.4);
}

.stat-card strong {
  display: block;
  font-size: var(--font-size-4xl);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-2xl);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-xl);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-xl);
}

.callout {
  background: linear-gradient(140deg, rgba(88, 166, 255, 0.08), rgba(13, 17, 23, 0.95));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
}

.callout h3 {
  margin-bottom: var(--spacing-md);
}

.list-check {
  list-style: none;
  padding-left: 0;
}

.list-check li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-muted);
}

.list-check li::before {
  content: "✓";
  color: var(--color-accent);
  font-weight: var(--font-weight-bold);
  line-height: 1.6;
}

.case-card {
  background: linear-gradient(160deg, rgba(15, 22, 36, 0.95), rgba(13, 17, 23, 0.9));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.45);
  transition: all var(--transition-base);
}

.case-card:hover {
  transform: translateY(-4px);
  border-color: rgba(88, 166, 255, 0.25);
  box-shadow: 0 22px 54px rgba(0, 0, 0, 0.55), 0 0 24px rgba(88, 166, 255, 0.12);
}

.case-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.case-body {
  padding: var(--spacing-xl);
}

.meta {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  background: rgba(88, 166, 255, 0.1);
  color: var(--color-primary-light);
  font-size: var(--font-size-xs);
  border: 1px solid rgba(88, 166, 255, 0.24);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-2xl);
}

.news-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 38px rgba(0, 0, 0, 0.45);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-3px);
  border-color: rgba(88, 166, 255, 0.25);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.55);
}

.news-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.news-card .news-content {
  padding: var(--spacing-lg);
  flex: 1;
}

.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
  margin: var(--spacing-3xl) 0;
}

/* ============================================
   新闻列表
   ============================================ */

.news-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
}

.news-item {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--spacing-2xl);
  background-color: var(--color-surface-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  position: relative;
}

.news-item:hover {
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.5);
  transform: translateX(4px);
  border-color: rgba(88, 166, 255, 0.2);
}

.news-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.news-content {
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.news-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.news-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

.news-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   合作伙伴
   ============================================ */

.partners-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.partner-logo {
  background-color: var(--color-surface-card);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.35);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  min-height: 120px;
}

.partner-logo:hover {
  box-shadow: var(--shadow-lg);
  transform: scale(1.05);
}

.partner-logo img {
  max-width: 100%;
  max-height: 80px;
}

/* ============================================
   表单
   ============================================ */

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: var(--spacing-md);
  background-color: #0f1624;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-dark);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: rgba(88, 166, 255, 0.6);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
  background-color: #111c2f;
}

/* ============================================
   响应式设计 - 平板
   ============================================ */

@media (max-width: 1024px) {
  .navbar {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .navbar-menu {
    gap: var(--spacing-lg);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .partners-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .news-item {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   响应式设计 - 手机
   ============================================ */

@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
  
  .navbar-menu {
    flex-direction: column;
    gap: var(--spacing-md);
    width: 100%;
  }
  
  .hero {
    padding: var(--spacing-3xl) var(--spacing-lg);
  }
  
  .hero h1 {
    font-size: var(--font-size-4xl);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .dropdown-menu {
    position: static;
    display: none;
    background-color: var(--color-primary-dark);
  }
  
  .dropdown:hover .dropdown-menu {
    display: block;
  }
}

/* ============================================
   实用类
   ============================================ */

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-muted {
  color: var(--color-text-muted);
}

.text-light {
  color: var(--color-text-light);
}

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

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

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

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }
.mt-6 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }
.mb-6 { margin-bottom: var(--spacing-2xl); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }
.p-6 { padding: var(--spacing-2xl); }

.hidden {
  display: none;
}

.visible {
  display: block;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }
.gap-5 { gap: var(--spacing-xl); }
.gap-6 { gap: var(--spacing-2xl); }