/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-magenta: #FF3CAC;
      --bg-light: #F5F7FB;
      --card-bg: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #4A4A4A;
      --text-on-dark: #FFFFFF;
      --border-light: #E8ECF1;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(10,14,39,0.06);
      --shadow-card-hover: 0 8px 24px rgba(10,14,39,0.10);
      --transition: 0.2s ease;
      --transition-card: 0.25s ease;
      --max-width: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--text-main);
    }
    h1 {
      font-size: 44px;
      line-height: 1.2;
    }
    h2 {
      font-size: 32px;
      line-height: 1.25;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 22px;
      line-height: 1.3;
      font-weight: 600;
    }
    h4 {
      font-size: 18px;
      line-height: 1.4;
      font-weight: 600;
    }
    p {
      color: var(--text-secondary);
      margin-bottom: 1.5em;
    }
    a {
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 导航 */
    .site-header {
      background: #fff;
      height: 64px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 50;
      box-shadow: 0 1px 0 var(--border-light);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      text-decoration: none;
      white-space: nowrap;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      text-decoration: none;
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
      border-bottom-color: var(--accent-cyan);
    }
    .search-box {
      display: flex;
      align-items: center;
      background: #F0F2F5;
      border-radius: 20px;
      padding: 0.4rem 1rem;
      margin-right: 0.5rem;
      width: 200px;
    }
    .search-box i {
      color: var(--text-secondary);
      font-size: 14px;
      margin-right: 0.5rem;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 100%;
      color: var(--text-main);
    }
    .btn-magenta {
      background: var(--accent-magenta);
      color: #fff;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-magenta:hover {
      background: #E02380;
      color: #fff;
    }
    .btn-ghost {
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      background: transparent;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.05);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-links, .search-box, .header-inner .btn-magenta {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 1.5rem;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
        gap: 1rem;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        font-size: 16px;
        color: var(--text-main);
        text-decoration: none;
        padding: 0.5rem 0;
        border-bottom: 1px solid var(--border-light);
      }
      .mobile-menu .search-box {
        display: flex;
        width: 100%;
        margin: 0.5rem 0;
      }
      .mobile-menu .btn-magenta {
        display: block;
        text-align: center;
      }
    }
    /* 板块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 48px 0;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 24px;
      }
      h3 {
        font-size: 20px;
      }
    }
    /* Hero */
    .hero {
      background: var(--primary);
      color: #fff;
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      background: rgba(255,255,255,0.05);
      border-radius: var(--radius-card);
      padding: 2rem;
      backdrop-filter: blur(4px);
    }
    .hero h1 {
      color: #fff;
    }
    .highlight-magenta {
      color: var(--accent-magenta);
      font-weight: 700;
    }
    .hero-sub {
      font-size: 16px;
      color: rgba(255,255,255,0.8);
      margin: 1rem 0 2rem;
    }
    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    @media (max-width: 640px) {
      .hero-content {
        flex-direction: column;
      }
      .hero-right {
        width: 100%;
      }
    }
    /* 卡片六边形图标 */
    .hex-icon {
      width: 64px;
      height: 64px;
      background: rgba(0,240,255,0.1);
      clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
      font-size: 28px;
      margin-bottom: 1rem;
      transition: var(--transition-card);
    }
    .card:hover .hex-icon {
      background: rgba(0,240,255,0.2);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-card);
      height: 100%;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .link-arrow {
      color: var(--accent-cyan);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: var(--transition);
    }
    .link-arrow i {
      transition: transform 0.2s;
    }
    .link-arrow:hover i {
      transform: translateX(4px);
    }
    /* 优势图文交替 */
    .adv-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .adv-text {
      flex: 5;
    }
    .adv-img {
      flex: 7;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .adv-img img {
      width: 100%;
      height: auto;
    }
    .data-highlight {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-magenta);
      margin: 1rem 0 0.5rem;
    }
    @media (max-width: 768px) {
      .adv-row {
        flex-direction: column !important;
      }
    }
    /* 成果深色块 */
    .dark-section {
      background: var(--primary);
      color: #fff;
    }
    .stat-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    .stat-label {
      color: rgba(255,255,255,0.7);
      font-size: 14px;
    }
    /* 证言卡片 */
    .testimonial-card {
      background: #F9FAFB;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-card);
    }
    .testimonial-card:hover {
      background: #fff;
      box-shadow: var(--shadow-card-hover);
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1rem 0;
    }
    .accordion-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-main);
    }
    .accordion--question i {
      color: var(--accent-cyan);
      margin-right: 0.5rem;
    }
    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      line-height: 1.75;
      padding-left: 1.8rem;
    }
    .accordion-item.active .accordion-answer {
      max-height: 200px;
      padding-top: 1rem;
    }
    .faq-toggle {
      font-size: 1.2rem;
      color: var(--accent-cyan);
    }
    /* 最终CTA */
    .final-cta {
      background: var(--primary);
      text-align: center;
      position: relative;
    }
    .final-cta h2 {
      color: #fff;
    }
    .glow-btn {
      box-shadow: 0 0 20px rgba(255,60,172,0.5);
    }
    /* 页脚 */
    .site-footer {
      background: #F5F7FB;
      border-top: 1px solid var(--border-light);
      padding: 4rem 0 2rem;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      justify-content: space-between;
    }
    .footer-col {
      flex: 1 1 200px;
    }
    .footer-col h4 {
      margin-bottom: 1rem;
      color: var(--text-main);
    }
    .footer-col a, .footer-col p {
      color: var(--text-secondary);
      font-size: 14px;
      text-decoration: none;
      display: block;
      margin-bottom: 0.5rem;
    }
    .footer-col a:hover {
      color: var(--accent-cyan);
    }
    .social-icons i {
      font-size: 1.2rem;
      margin-right: 12px;
      color: #7A7A7A;
      transition: var(--transition);
    }
    .social-icons i:hover {
      color: var(--accent-cyan);
    }
    .copyright {
      text-align: center;
      margin-top: 2rem;
      font-size: 13px;
      color: #7A7A7A;
    }
    @media (max-width: 640px) {
      .footer-grid {
        flex-direction: column;
      }
    }