/* roulang page: index */
/* ----- 设计变量与重置 ----- */
    :root {
      --primary-violet: #7B2FBE;
      --primary-red: #E63946;
      --accent-orange: #F4A261;
      --bg-deep: #0B0C10;
      --card-bg: rgba(15, 23, 42, 0.7);
      --text-light: #F1F5F9;
      --text-dark: #1E293B;
      --muted: #94A3B8;
      --border-light: rgba(255,255,255,0.18);
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-pill: 50px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.25);
      --shadow-hover: 0 12px 40px rgba(123,47,190,0.35);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input {
      font-family: inherit;
      outline: none;
      border: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 背景装饰 */
    .bg-blur-card {
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      background: var(--card-bg);
      border: 1px solid var(--border-light);
    }
    /* 渐变动效 */
    .gradient-text {
      background: linear-gradient(135deg, var(--primary-violet), var(--primary-red));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-violet), var(--primary-red));
      color: white;
      border-radius: var(--radius-pill);
      padding: 14px 32px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      box-shadow: 0 8px 20px rgba(123,47,190,0.3);
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 0 20px rgba(230,57,70,0.7);
    }
    .btn-outline {
      border: 2px solid rgba(255,255,255,0.5);
      background: transparent;
      color: white;
      border-radius: var(--radius-pill);
      padding: 12px 30px;
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: white;
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
      h1 {
        font-size: 36px !important;
      }
      h2 {
        font-size: 28px !important;
      }
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 12, 16, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      background: linear-gradient(135deg, #c084fc, #f472b6);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: #e2e8f0;
      position: relative;
      padding: 4px 0;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: linear-gradient(to right, var(--primary-violet), var(--primary-red));
      transition: width 0.3s;
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-menu {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(11,12,16,0.96);
        backdrop-filter: blur(30px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        transition: right 0.4s ease;
        font-size: 24px;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .nav-cta {
        margin-left: 0;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(11, 12, 16, 0.65);
    }
    .hero-container {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
    }
    .hero-left {
      max-width: 600px;
    }
    .hero h1 {
      font-size: 52px;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .highlight {
      color: var(--accent-orange);
    }
    .badge-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin: 32px 0;
    }
    .data-badge {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border-radius: 40px;
      padding: 10px 20px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.15);
    }
    .pulse-dot {
      width: 10px;
      height: 10px;
      background: #22c55e;
      border-radius: 50%;
      box-shadow: 0 0 8px #22c55e;
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.7; transform: scale(1); }
      50% { opacity: 1; transform: scale(1.3); }
      100% { opacity: 0.7; transform: scale(1); }
    }
    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .stat-card {
      background: rgba(15,23,42,0.8);
      backdrop-filter: blur(16px);
      border-radius: 20px;
      padding: 28px;
      border-left: 4px solid;
      border-image: linear-gradient(to bottom, #7B2FBE, #E63946) 1;
      transition: var(--transition);
    }
    .stat-number {
      font-size: 42px;
      font-weight: 900;
      font-feature-settings: "tnum";
    }
    .trend-up { color: #22c55e; }
    /* 服务卡片网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: rgba(15,23,42,0.7);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      overflow: hidden;
      transition: all 0.3s;
      border: 1px solid rgba(255,255,255,0.08);
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(123,47,190,0.4);
    }
    .card-img {
      height: 160px;
      background-size: cover;
    }
    .tag {
      background: var(--primary-red);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
    }
    /* 对比表 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .vs-badge {
      width: 60px;
      height: 60px;
      background: linear-gradient(135deg, #7B2FBE, #E63946);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    /* 响应式调整 */
    @media (max-width: 768px) {
      .stats-grid, .services-grid {
        grid-template-columns: 1fr;
      }
      .compare-wrapper {
        flex-direction: column;
      }
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }