/* roulang page: index */
/* 设计变量 */
    :root {
      --primary: #7B2FF7;
      --primary-dark: #5A1FBF;
      --secondary: #FF6B35;
      --accent: #00F5D4;
      --dark-bg: #1A0A2E;
      --body-bg: #F8F9FC;
      --card-bg: #FFFFFF;
      --text-main: #1E1E2E;
      --text-muted: #5A5A6E;
      --border-light: #E9EBF0;
      --shadow-card: 0 8px 28px rgba(0,0,0,0.04);
      --shadow-hover: 0 18px 36px rgba(123,47,247,0.12);
      --radius-lg: 24px;
      --radius-md: 18px;
      --radius-sm: 14px;
      --radius-pill: 50px;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--body-bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      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;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 100;
      padding: 16px 0;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
      font-weight: bold;
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding-bottom: 6px;
      font-size: 0.98rem;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: linear-gradient(to right, var(--primary), var(--secondary));
      border-radius: 4px;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 30px;
      height: 24px;
      position: relative;
      z-index: 150;
    }

    .hamburger span {
      display: block;
      width: 28px;
      height: 3px;
      background: var(--text-main);
      border-radius: 4px;
      transition: 0.2s ease;
    }

    .hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
    .hamburger.open span:nth-child(2) { opacity: 0; }
    .hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: linear-gradient(135deg, var(--dark-bg), #2D0F4E);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 120;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
      flex-direction: column;
      gap: 32px;
    }

    .mobile-menu.open {
      opacity: 1;
      pointer-events: auto;
    }

    .mobile-menu a {
      color: white;
      font-size: 1.8rem;
      font-weight: 500;
      letter-spacing: 1px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }

    /* Hero */
    .hero {
      padding: 130px 0 80px;
      background: linear-gradient(180deg, #F4F2FF 0%, var(--body-bg) 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-wave {
      position: absolute;
      top: 0;
      right: 0;
      width: 60%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(123,47,247,0.08) 0%, transparent 70%),
                  radial-gradient(circle at 70% 60%, rgba(255,107,53,0.06) 0%, transparent 70%);
      z-index: 0;
      animation: floatWave 8s infinite alternate ease-in-out;
    }

    @keyframes floatWave {
      0% { transform: translateX(0) translateY(0); }
      100% { transform: translateX(20px) translateY(-15px); }
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(to right, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      border: none;
      cursor: pointer;
      box-shadow: 0 8px 18px rgba(123,47,247,0.3);
      transition: 0.2s;
      display: inline-block;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 24px rgba(123,47,247,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: 0.2s;
    }

    .btn-outline:hover {
      background: rgba(123,47,247,0.08);
    }

    .hero-badges {
      display: flex;
      gap: 24px;
      margin-top: 48px;
      flex-wrap: wrap;
    }

    .badge-card {
      background: white;
      border-radius: 40px;
      padding: 12px 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .badge-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      font-variant-numeric: tabular-nums;
    }

    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
      }
      .hero-text h1 {
        font-size: 2.4rem;
      }
    }

    /* 通用section */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }

    .data-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      background: linear-gradient(180deg, #FFFFFF 0%, #F9F7FF 100%);
    }

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

    .data-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .trend-up { color: #00C853; margin-left: 8px; font-size: 1.2rem; }

    @media (max-width: 768px) {
      .data-grid { grid-template-columns: 1fr; }
    }

    /* 服务矩阵两列网格 */
    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }

    .service-card {
      background: white;
      border-radius: 24px;
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
      position: relative;
      border: 2px solid transparent;
    }

    .service-card:hover {
      border-image: linear-gradient(135deg, var(--primary), var(--secondary)) 1;
      box-shadow: var(--shadow-hover);
    }

    .service-icon {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .service-grid { grid-template-columns: 1fr; }
    }

    /* 对比双栏 */
    .compare-row {
      display: flex;
      gap: 32px;
    }

    .compare-card {
      flex: 1;
      padding: 40px;
      border-radius: var(--radius-lg);
      background: #F2F0F5;
    }

    .compare-card.after {
      background: linear-gradient(135deg, var(--primary), var(--dark-bg));
      color: white;
    }

    .badge-boost {
      background: var(--accent);
      color: #000;
      font-weight: 800;
      padding: 8px 20px;
      border-radius: 40px;
    }

    @media (max-width: 768px) {
      .compare-row { flex-direction: column; }
    }

    /* 横向滚动案例 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 12px;
    }

    .case-card {
      min-width: 280px;
      background: white;
      border-radius: 24px;
      padding: 24px;
      box-shadow: var(--shadow-card);
    }

    /* FAQ */
    details {
      background: white;
      border-radius: 18px;
      padding: 18px 24px;
      margin-bottom: 16px;
    }

    summary {
      font-weight: 600;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #7B2FF7, #FF6B35);
      border-radius: 40px;
      padding: 64px 32px;
      text-align: center;
      color: white;
      margin: 60px 0;
    }

    .btn-glass {
      background: rgba(255,255,255,0.2);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.3);
      padding: 16px 42px;
      border-radius: 60px;
      color: white;
      font-weight: 700;
    }

    footer {
      background: #0B0618;
      color: #CECECE;
      padding: 60px 0 30px;
    }