/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --deep-space: #0B0E1A;
      --electric-blue: #1A3AFF;
      --energy-orange: #FF8C2A;
      --signal-cyan: #00F0C8;
      --glass-bg: rgba(10, 15, 30, 0.65);
      --border-light: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #6B7A8F;
      --card-radius-lg: 16px;
      --card-radius-md: 12px;
      --card-radius-sm: 8px;
      --shadow-glow: 0 0 20px rgba(26, 58, 255, 0.15);
      --shadow-orange: 0 0 24px rgba(255, 140, 42, 0.5);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-heading);
      background-color: var(--deep-space);
      color: var(--text-primary);
      line-height: 1.8;
      letter-spacing: 0.02em;
      background-image: radial-gradient(circle at 30% 20%, #151a30 0%, #0B0E1A 90%);
      min-height: 100vh;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 28px;
    }
    /* 玻璃拟态卡片系统 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-light);
      border-radius: var(--card-radius-lg);
      box-shadow: var(--shadow-glow);
      transition: var(--transition);
    }
    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 0 28px rgba(26, 58, 255, 0.3);
    }
    /* 导航栏 - 沉浸式玻璃顶部导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 15, 30, 0.7);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(26, 58, 255, 0.2);
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 28px;
    }
    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 8px;
    
    .logo-text {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--text-primary);
      letter-spacing: 0.04rem;
      background: linear-gradient(135deg, #ffffff 0%, #c0d4ff 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo-domain {
      font-size: 0.8rem;
      color: var(--text-muted);
      font-weight: 400;
      letter-spacing: 0.03em;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a.active {
      color: var(--signal-cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--signal-cyan);
      box-shadow: 0 0 8px var(--signal-cyan);
      border-radius: 4px;
    }
    .nav-cta {
      background: linear-gradient(135deg, #FF8C2A, #FF6A00);
      color: white;
      padding: 8px 20px;
      border-radius: 12px;
      font-weight: bold;
      box-shadow: var(--shadow-orange);
      transition: all 0.25s;
      border: none;
      cursor: pointer;
    }
    .nav-cta:hover {
      transform: scale(1.05);
      box-shadow: 0 0 30px rgba(255, 140, 42, 0.8);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* 移动端底部胶囊导航 (默认隐藏，小屏显示) */
    .bottom-mobile-nav {
      display: none;
    }
    /* Hero 双栏杂志布局 */
    .hero-section {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 60px;
      min-height: 90vh;
    }
    .hero-left {
      flex: 1.2;
    }
    .hero-right {
      flex: 0.9;
      position: relative;
    }
    .hero-h1 {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #fff, #e0ecff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #B0C4DE;
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #FF8C2A, #FF6A00);
      color: white;
      padding: 14px 32px;
      border-radius: 12px;
      font-weight: 700;
      border: none;
      box-shadow: 0 0 24px rgba(255,140,42,0.5);
      transition: all 0.25s;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      transform: scale(1.04);
      box-shadow: 0 0 35px rgba(255,140,42,0.9);
    }
    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--electric-blue);
      color: var(--electric-blue);
      padding: 14px 32px;
      border-radius: 12px;
      font-weight: 700;
      transition: all 0.25s;
      text-decoration: none;
    }
    .btn-ghost:hover {
      background: rgba(26,58,255,0.1);
      box-shadow: 0 0 15px var(--electric-blue);
    }
    .hero-image-frame {
      border-radius: 24px;
      overflow: hidden;
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      position: relative;
      box-shadow: 0 10px 30px rgba(0,0,0,0.6);
    }
    .hero-image-frame img {
      width: 100%;
      height: auto;
      display: block;
    }
    .data-float {
      position: absolute;
      bottom: 16px;
      right: 16px;
      background: rgba(0,0,0,0.7);
      backdrop-filter: blur(12px);
      padding: 10px 16px;
      border-radius: 16px;
      color: var(--signal-cyan);
    }
    /* 亮点网格 3x2 非对称 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin: 80px 0;
    }
    .highlight-stat {
      background: rgba(10,15,30,0.7);
      backdrop-filter: blur(14px);
      padding: 28px;
      border-radius: 16px;
      border-left: 4px solid var(--electric-blue);
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: white;
    }
    .idea-card {
      grid-column: span 2;
      background: rgba(10,15,30,0.7);
      backdrop-filter: blur(14px);
      padding: 28px;
      border-radius: 16px;
      border-top: 4px solid var(--energy-orange);
    }
    /* 方案对比 */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
      margin: 60px 0;
    }
    .comp-card {
      background: rgba(10,15,30,0.75);
      backdrop-filter: blur(14px);
      border-radius: 20px;
      padding: 32px;
    }
    .comp-card.recommended {
      border: 1px solid var(--energy-orange);
      position: relative;
    }
    .badge {
      background: var(--energy-orange);
      color: black;
      padding: 4px 14px;
      border-radius: 20px;
      font-weight: bold;
    }
    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 20px;
      margin: 50px 0;
    }
    .case-item {
      break-inside: avoid;
      margin-bottom: 20px;
      background: rgba(20,25,40,0.8);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      overflow: hidden;
    }
    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: rgba(15,20,32,0.7);
      backdrop-filter: blur(10px);
      padding: 20px;
      border-radius: 12px;
      border-left: 4px solid var(--electric-blue);
    }
    /* CTA Banner */
    .cta-banner {
      background: linear-gradient(135deg, #0f1530, #1a2f8a);
      padding: 80px 20px;
      text-align: center;
    }
    footer {
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    @media (max-width: 992px) {
      .hero-section { flex-direction: column; }
      .highlights-grid { grid-template-columns: 1fr 1fr; }
      .idea-card { grid-column: span 2; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .bottom-mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(8,12,24,0.9);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px;
        z-index: 999;
      }
      .comparison-grid, .faq-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 2; }
    }