/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-light: #A855F7;
      --accent: #00F0B5;
      --bg-deep: #0B0C10;
      --bg-card: #1A1B24;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B3C1;
      --text-muted: #6B6F80;
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --radius-badge: 8px;
      --shadow-card: 0 8px 32px rgba(123,47,247,0.15);
      --shadow-hover: 0 12px 40px rgba(123,47,247,0.3);
      --transition: all 0.25s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a, button, input {
      font-family: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      backdrop-filter: blur(16px);
      background: rgba(11, 12, 16, 0.8);
      border-bottom: 1px solid rgba(123, 47, 247, 0.2);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: #fff;
      font-weight: 700;
      font-size: 1.7rem;
      letter-spacing: 1px;
    }
    .logo i {
      color: var(--accent);
      font-size: 2rem;
    }
    .logo span {
      background: linear-gradient(135deg, #fff, #e0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: var(--transition);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 12, 16, 0.9);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(123, 47, 247, 0.25);
      justify-content: space-around;
      padding: 12px 16px;
      z-index: 99;
    }
    .mobile-bottom-nav a {
      color: var(--text-muted);
      text-align: center;
      font-size: 0.8rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      text-decoration: none;
      transition: var(--transition);
    }
    .mobile-bottom-nav a i {
      font-size: 1.3rem;
    }
    .mobile-bottom-nav a.active,
    .mobile-bottom-nav a:hover {
      color: var(--accent);
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
      text-align: center;
      letter-spacing: 1px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 56px;
      font-size: 1.15rem;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 30%, rgba(123,47,247,0.18), transparent 60%), 
                  radial-gradient(circle at 80% 70%, rgba(0,240,181,0.08), transparent 50%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-size: 4rem;
      font-weight: 800;
      background: linear-gradient(135deg, #fff, #d4c4ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
      line-height: 1.2;
    }
    .hero p {
      font-size: 1.3rem;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #fff;
      box-shadow: 0 6px 18px rgba(123,47,247,0.4);
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(123,47,247,0.5);
    }
    .btn-outline {
      border: 1.5px solid var(--accent);
      color: var(--accent);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0,240,181,0.1);
      transform: translateY(-2px);
    }
    .floating-badges {
      display: flex;
      gap: 24px;
      margin-top: 48px;
    }
    .badge {
      background: rgba(26,27,36,0.7);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(123,47,247,0.5);
      padding: 12px 24px;
      border-radius: 40px;
      color: #fff;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.95rem;
    }
    .badge i {
      color: var(--accent);
    }

    /* 数据看板 */
    .data-board {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: -60px;
      position: relative;
      z-index: 5;
    }
    .stat-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px 16px;
      text-align: center;
      border-top: 3px solid transparent;
      border-image: linear-gradient(90deg, var(--accent), var(--primary)) 1;
      box-shadow: var(--shadow-card);
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: #fff;
      font-variant-numeric: tabular-nums;
      display: flex;
      align-items: baseline;
      justify-content: center;
      gap: 4px;
    }
    .stat-unit {
      font-size: 1.2rem;
      color: var(--accent);
    }
    .stat-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 32px;
    }
    .service-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      transition: var(--transition);
      border: 1px solid transparent;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .service-card:hover {
      transform: translateY(-8px);
      border-color: var(--accent);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.6rem;
      color: #fff;
      margin-bottom: 12px;
    }
    .service-desc {
      color: var(--text-secondary);
      margin-bottom: 20px;
    }
    .data-tag {
      display: inline-block;
      background: rgba(0,240,181,0.1);
      color: var(--accent);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
    }

    /* 对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }
    .compare-col {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-col.advantage {
      background: linear-gradient(145deg, #1a1b2f, #1e1f2e);
      border: 1px solid rgba(123,47,247,0.4);
      box-shadow: var(--shadow-card);
    }
    .compare-col h3 {
      color: #fff;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      margin-bottom: 16px;
      padding-bottom: 12px;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .highlight {
      color: var(--accent);
      font-weight: 700;
    }

    /* 流程 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 32px;
      margin-top: 40px;
    }
    .step {
      flex: 1 1 180px;
      text-align: center;
      position: relative;
    }
    .step-icon {
      font-size: 2.5rem;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .step h4 {
      color: #fff;
      font-weight: 600;
    }

    /* 案例墙 */
    .logo-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      opacity: 0.8;
      margin: 40px 0;
    }
    .case-badge {
      background: var(--bg-card);
      padding: 12px 24px;
      border-radius: 40px;
      color: #fff;
      border:1px solid rgba(123,47,247,0.5);
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      color: #fff;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid var(--accent);
      transition: var(--transition);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 28px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 28px 20px;
    }
    .faq-item.active .faq-question {
      border-left-color: var(--primary);
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at 20% 20%, rgba(123,47,247,0.3), transparent);
    }
    .cta-form {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      max-width: 700px;
      margin: 0 auto;
    }
    .cta-form input {
      flex: 1 1 200px;
      padding: 14px 18px;
      border-radius: var(--radius-input);
      background: #1e1f2b;
      border: 1px solid rgba(255,255,255,0.1);
      color: #fff;
    }
    .cta-form input:focus {
      outline: none;
      border-color: var(--accent);
    }

    /* footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      padding: 60px 0 40px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 24px 0;
      text-align: center;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .data-board { grid-template-columns: repeat(2,1fr); }
      .compare-wrapper { grid-template-columns: 1fr; }
      .hero h1 { font-size: 3rem; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .mobile-bottom-nav { display: flex; }
      .hero h1 { font-size: 2.4rem; }
      .data-board { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 70px 0; }
    }