/* roulang page: index */
/* ----- 全局设计变量与基础重置 ----- */
    :root {
      --deep-black: #0B0C10;
      --competitive-red: #E63946;
      --precision-gray-bg: #F1F2F6;
      --divider-gray: #D9DCD6;
      --accent-cyan: #00B4D8;
      --white: #FFFFFF;
      --off-white: #F8F9FA;
      --success-green: #2A9D8F;
      --text-dark: #333333;
      --text-muted-dark: #666666;
      --text-light-muted: #B0B3B8;
      --dark-surface: #1A1C23;
      --border-subtle: rgba(255,255,255,0.05);
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --space-section: 120px;
      --space-mobile-section: 80px;
      --card-radius-lg: 12px;
      --card-radius-sm: 4px;
      --card-padding: 32px;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-black);
      color: var(--text-light-muted);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      font-weight: 600;
      margin-top: 0;
    }
    
    a {
      text-decoration: none;
      transition: color 0.25s ease;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .button {
      cursor: pointer;
      font-family: var(--font-sans);
      transition: all 0.25s ease-out;
    }
    
    input {
      font-family: var(--font-sans);
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 自定义覆盖 Foundation 默认样式 */
    .grid-container {
      max-width: 1200px;
      padding: 0 20px;
    }
    
    .button {
      border-radius: var(--card-radius-sm);
      font-weight: 600;
      letter-spacing: 0.3px;
    }
    
    /* ----- 导航栏：品牌活动风格 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: rgba(11, 12, 16, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 0 20px;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      height: 70px;
    }
    
    .logo-brand {
      font-size: 1.5rem;
      font-weight: 700;
      font-style: italic;
      color: var(--white);
      letter-spacing: -0.3px;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo-brand small {
      font-size: 0.7rem;
      font-weight: 400;
      font-style: normal;
      color: var(--accent-cyan);
      margin-left: 2px;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    
    .nav-links a {
      color: var(--text-light-muted);
      font-size: 0.8rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.25s ease;
    }
    
    .nav-links a:hover {
      color: var(--white);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .nav-cta {
      background: var(--competitive-red);
      color: var(--white) !important;
      padding: 10px 24px !important;
      border-radius: var(--card-radius-sm);
      font-weight: 600 !important;
      font-size: 0.8rem !important;
      letter-spacing: 0.5px !important;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .nav-cta:hover {
      background: #c1121f;
      color: white !important;
    }
    
    .hot-badge {
      background: var(--competitive-red);
      color: white;
      font-size: 0.65rem;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 2px;
      margin-left: 6px;
      letter-spacing: 0.5px;
    }
    
    /* 移动端汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--white);
      transition: 0.3s;
    }
    
    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.2rem;
      }
    }
    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(11,12,16,0.96);
        flex-direction: column;
        align-items: flex-start;
        padding: 30px;
        gap: 1.8rem;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        backdrop-filter: blur(12px);
        border-bottom: 1px solid rgba(255,255,255,0.05);
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .nav-cta {
        width: fit-content;
      }
    }
    
    /* ----- 区块通用间距 ----- */
    section {
      padding: var(--space-section) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: var(--space-mobile-section) 0;
      }
    }
    
    .section-title {
      font-size: 2.5rem;
      font-weight: 600;
      color: var(--white);
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 70px;
      height: 4px;
      background: var(--competitive-red);
      margin-top: 0.5rem;
    }
    .light-section .section-title {
      color: var(--deep-black);
    }
    
    /* ----- Hero 首屏 ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, #1e212b, #0B0C10 70%);
      position: relative;
      overflow: hidden;
      padding-top: 70px;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.1;
      color: var(--white);
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-light-muted);
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--competitive-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--card-radius-sm);
      font-weight: 600;
      border: none;
      position: relative;
    }
    .btn-primary::after {
      content: '';
      position: absolute;
      top: -4px; left: -4px; right: -4px; bottom: -4px;
      border-radius: 6px;
      background: transparent;
      border: 2px solid var(--competitive-red);
      opacity: 0;
      animation: pulse-ring 2s infinite;
    }
    @keyframes pulse-ring {
      0% { opacity: 0.6; transform: scale(1); }
      100% { opacity: 0; transform: scale(1.08); }
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--white);
      padding: 14px 32px;
      border-radius: var(--card-radius-sm);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--accent-cyan);
      border-color: var(--accent-cyan);
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      height: 420px;
      border-radius: 12px;
      position: relative;
      box-shadow: 0 0 0 1px rgba(255,255,255,0.08);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--accent-cyan);
      font-size: 1.8rem;
      animation: bounce 2s infinite;
    }
    @keyframes bounce {
      0%,100%{transform:translateY(0);}
      50%{transform:translateY(8px);}
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 2.5rem;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    
    /* 优势数据立柱 */
    .advantages {
      background: var(--precision-gray-bg);
    }
    .data-pillars {
      display: flex;
      justify-content: space-around;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .pillar {
      text-align: center;
      min-width: 180px;
    }
    .pillar-number {
      font-family: var(--font-mono);
      font-size: 3.5rem;
      font-weight: 600;
      color: var(--competitive-red);
      line-height: 1;
    }
    .pillar-desc {
      color: var(--text-dark);
      font-weight: 500;
      margin-top: 0.5rem;
    }
    @media (max-width: 640px) {
      .data-pillars {
        flex-wrap: nowrap;
        overflow-x: auto;
      }
    }
    
    /* 服务矩阵 */
    .service-matrix {
      display: flex;
      gap: 2rem;
    }
    .main-card {
      flex: 0 0 60%;
      background: var(--dark-surface);
      border-radius: var(--card-radius-lg);
      padding: var(--card-padding);
      border-left: 4px solid var(--competitive-red);
    }
    .main-card img {
      border-radius: 8px;
      margin: 20px 0;
    }
    .service-tabs {
      flex: 0 0 35%;
      display: flex;
      flex-direction: column;
      gap: 0.8rem;
    }
    .tab {
      background: var(--dark-surface);
      padding: 16px 20px;
      border-radius: 0;
      color: var(--text-light-muted);
      cursor: pointer;
      font-weight: 500;
      transition: 0.2s;
    }
    .tab.active {
      background: var(--competitive-red);
      color: white;
      position: relative;
    }
    .tab.active::after {
      content: '→';
      position: absolute;
      right: 15px;
    }
    @media (max-width: 768px) {
      .service-matrix {
        flex-direction: column;
      }
      .main-card, .service-tabs {
        flex: auto;
        width: 100%;
      }
    }
    
    /* 信任区 */
    .trust-timeline {
      background: var(--deep-black);
    }
    .badge-list {
      display: flex;
      gap: 3rem;
      justify-content: center;
      color: var(--white);
      font-weight: 600;
    }
    
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 1.5rem;
    }
    .data-block {
      background: #1A1C23;
      padding: 24px;
      font-family: var(--font-mono);
      border: 1px solid rgba(255,255,255,0.05);
    }
    
    /* FAQ */
    .faq-grid {
      display: flex;
      gap: 2rem;
    }
    .faq-left {
      flex: 0 0 200px;
    }
    .faq-right {
      flex: 1;
    }
    .accordion-item {
      background: #1A1C23;
      margin-bottom: 0.8rem;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .accordion-item.active {
      border-left: 3px solid var(--accent-cyan);
    }
    
    /* CTA */
    .cta-section {
      background: #0B0C10;
      text-align: center;
    }
    
    /* 页脚 */
    .footer {
      background: #0B0C10;
      padding: 2rem 0;
    }