/* roulang page: index */
:root {
      --primary-bg: #0B0A1A;
      --secondary-bg: #1E1C2E;
      --light-bg: #F5F3FF;
      --gold: #F2B705;
      --cyan: #2DD4BF;
      --text-white: #FFFFFF;
      --text-light: #CAC8E0;
      --text-body: #E0DFF0;
      --card-radius: 24px;
      --btn-radius: 40px;
      --shadow-card: 0 20px 40px rgba(0,0,0,0.5);
      --shadow-hover: 0 30px 60px rgba(242,183,5,0.25);
      --border-subtle: rgba(242,183,5,0.15);
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
      background-color: var(--primary-bg);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 PC */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11,10,26,0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(242,183,5,0.1);
      z-index: 999;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: radial-gradient(circle at 30% 30%, var(--gold), var(--cyan));
      border-radius: 50%;
      box-shadow: 0 0 12px var(--gold);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--gold);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--gold), var(--cyan));
      border: none;
      color: #0B0A1A;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--btn-radius);
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      box-shadow: 0 8px 20px rgba(242,183,5,0.3);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 12px 28px rgba(242,183,5,0.45);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--gold);
      color: var(--gold);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--btn-radius);
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(242,183,5,0.1);
      border-color: var(--cyan);
      color: var(--cyan);
    }
    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11,10,26,0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-top: 1px solid rgba(242,183,5,0.2);
      padding: 8px 16px;
      justify-content: space-around;
      align-items: center;
      z-index: 1000;
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-light);
      font-size: 0.7rem;
      gap: 4px;
      transition: var(--transition);
    }
    .mobile-nav a i {
      font-size: 1.4rem;
    }
    .mobile-nav a.active {
      color: var(--gold);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 50%, #1a1430, #0B0A1A);
    }
    .hero-particles {
      position: absolute;
      inset: 0;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 800px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 8vw, 3.8rem);
      font-weight: 700;
      background: linear-gradient(135deg, var(--gold), var(--cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 28px;
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 28px;
      color: var(--text-light);
      font-size: 0.85rem;
      flex-wrap: wrap;
    }
    .trust-badges span i {
      color: var(--cyan);
      margin-right: 4px;
    }
    /* 板块通用 */
    section {
      padding: 120px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 64px;
    }
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 12px;
    }
    .title-decor {
      width: 50px;
      height: 4px;
      background: var(--gold);
      margin: 0 auto;
      border-radius: 2px;
    }
    /* 数据看板 */
    .dashboard-section {
      background-color: var(--light-bg);
      color: #1E1C2E;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--primary-bg);
      border-radius: 20px;
      padding: 28px 16px;
      text-align: center;
      color: var(--text-white);
      transition: var(--transition);
      border: 1px solid var(--border-subtle);
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--gold), var(--cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .stat-label {
      color: var(--text-light);
      margin-top: 8px;
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--secondary-bg);
      border-radius: var(--card-radius);
      padding: 32px;
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
      border-color: var(--cyan);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--cyan);
      margin-bottom: 18px;
    }
    .service-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--text-white);
      margin-bottom: 12px;
    }
    .service-desc {
      color: var(--text-light);
      flex: 1;
    }
    .text-link {
      color: var(--gold);
      font-weight: 500;
      margin-top: 16px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: var(--transition);
    }
    .text-link i {
      transition: transform 0.2s;
    }
    .text-link:hover i {
      transform: translateX(4px);
    }
    /* 对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 40px;
      align-items: center;
    }
    .compare-col {
      background: var(--secondary-bg);
      border-radius: var(--card-radius);
      padding: 40px;
      border: 1px solid var(--border-subtle);
    }
    .compare-col.bad {
      opacity: 0.8;
      color: #9b9ab0;
    }
    .compare-col.good {
      border-color: var(--cyan);
    }
    .vs-badge {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--gold);
    }
    .compare-list {
      list-style: none;
      margin-top: 24px;
    }
    .compare-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    /* FAQ */
    .faq-section {
      background: var(--secondary-bg);
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    details {
      background: rgba(11,10,26,0.7);
      border: 1px solid var(--border-subtle);
      border-radius: 16px;
      padding: 18px 24px;
      margin-bottom: 16px;
      transition: var(--transition);
    }
    details[open] {
      background: rgba(242,183,5,0.05);
      border-color: var(--gold);
    }
    summary {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-white);
      cursor: pointer;
      list-style: none;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    summary::before {
      content: "★";
      color: var(--gold);
    }
    .faq-answer {
      margin-top: 16px;
      color: var(--text-light);
    }
    /* 表单 */
    .form-card {
      max-width: 520px;
      margin: 0 auto;
      background: var(--secondary-bg);
      border-radius: 32px;
      padding: 48px 40px;
      border: 1px solid var(--gold);
      box-shadow: 0 0 30px rgba(242,183,5,0.2);
      text-align: center;
    }
    .input-group {
      margin-bottom: 20px;
      text-align: left;
    }
    .input-group input {
      width: 100%;
      padding: 14px 18px;
      background: #0B0A1A;
      border: 1px solid var(--gold);
      border-radius: 30px;
      color: white;
      font-size: 1rem;
      transition: var(--transition);
    }
    .input-group input:focus {
      outline: none;
      border-color: var(--cyan);
      box-shadow: 0 0 10px var(--cyan);
    }
    .trust-icons {
      display: flex;
      justify-content: center;
      gap: 24px;
      margin-top: 24px;
      color: var(--text-light);
      font-size: 0.85rem;
    }
    /* 页脚 */
    .footer {
      background: #070614;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
    }
    .footer-col h4 {
      color: var(--text-white);
      margin-bottom: 18px;
    }
    .footer-col a {
      display: block;
      color: var(--text-light);
      margin-bottom: 10px;
      transition: var(--transition);
    }
    .footer-col a:hover {
      color: var(--gold);
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--text-light);
      font-size: 0.9rem;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .main-header { display: none; }
      .mobile-nav { display: flex; }
      section { padding: 80px 0; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: 1fr; }
      .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { text-align: center; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.2rem; }
    }