/* roulang page: index */
:root {
      --deep-space: #0B0C10;
      --star-purple: #7B2FFF;
      --cyan-electric: #00E5FF;
      --nebula-gray: #F2F0F5;
      --dark-card: #1E1E24;
      --text-white: #FFFFFF;
      --text-muted: #B0B0C0;
      --text-dark: #0B0C10;
      --text-gray: #555566;
      --green-arena: #00F0A8;
      --orange-alert: #FF6B35;
      --border-light: rgba(255,255,255,0.06);
      --shadow-dark: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-light: 0 2px 16px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: system-ui, -apple-system, "Microsoft YaHei", "PingFang SC", sans-serif;
      background-color: var(--deep-space);
      color: var(--text-white);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      letter-spacing: -0.01em;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      height: 64px;
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      padding: 0 20px;
    }
    .navbar-brand-custom {
      display: flex;
      align-items: center;
      color: white;
      font-weight: 700;
      font-size: 1.25rem;
      white-space: nowrap;
    }
    .navbar-brand-custom svg {
      width: 32px;
      height: 32px;
      margin-right: 8px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      margin-left: auto;
      margin-right: 20px;
    }
    .nav-link-item {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
      padding: 4px 0;
    }
    .nav-link-item:hover,
    .nav-link-item.active {
      color: var(--cyan-electric);
    }
    .nav-link-item.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--star-purple);
    }
    .search-box {
      background: var(--dark-card);
      border-radius: 20px;
      padding: 6px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      width: 180px;
      margin-right: 12px;
    }
    .search-box i {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .search-box input {
      background: transparent;
      border: none;
      outline: none;
      color: white;
      font-size: 0.85rem;
      width: 100%;
    }
    .search-box input::placeholder {
      color: var(--text-muted);
    }
    .btn-primary-custom {
      background: var(--star-purple);
      border: none;
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 22px;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary-custom:hover {
      background: #6928E0;
      box-shadow: 0 0 20px rgba(123,47,255,0.5);
      transform: scale(1.03);
      color: white;
    }
    .btn-outline-cyan {
      background: transparent;
      border: 2px solid var(--cyan-electric);
      color: var(--cyan-electric);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 22px;
      transition: var(--transition);
    }
    .btn-outline-cyan:hover {
      background: rgba(0, 229, 255, 0.1);
      color: var(--cyan-electric);
      transform: scale(1.03);
    }
    .btn-ghost-white {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 22px;
      transition: var(--transition);
    }
    .btn-ghost-white:hover {
      background: rgba(255,255,255,0.1);
      color: white;
      transform: scale(1.03);
    }
    @media (max-width: 991px) {
      .nav-links, .search-box, .navbar .btn-primary-custom {
        display: none;
      }
      .offcanvas-custom {
        background: var(--deep-space);
      }
      .offcanvas-custom .nav-link-item {
        color: var(--text-muted);
        padding: 12px 0;
        border-bottom: 1px solid rgba(255,255,255,0.05);
      }
      .mobile-cta {
        margin-top: 20px;
        width: 100%;
      }
    }
    /* Hero 粒子背景 */
    .hero-section {
      height: 100vh;
      min-height: 700px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: linear-gradient(180deg, #0B0C10 0%, #1A1030 100%);
      overflow: hidden;
    }
    .particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
    }
    .particle {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.3;
      animation: float 8s infinite ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0px) scale(1); opacity: 0.2; }
      50% { transform: translateY(-30px) scale(1.4); opacity: 0.5; }
      100% { transform: translateY(0px) scale(1); opacity: 0.2; }
    }
    .hero-content {
      position: relative;
      z-index: 10;
      text-align: center;
      max-width: 800px;
      padding: 0 20px;
    }
    .hero-tag {
      background: var(--star-purple);
      color: white;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
      display: inline-block;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: clamp(3rem, 6vw, 5rem);
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 1.5rem;
      color: white;
    }
    .hero-title span.highlight-purple { color: var(--star-purple); }
    .hero-title span.highlight-cyan { color: var(--cyan-electric); }
    .hero-sub {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 32px;
      font-size: 1.125rem;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--cyan-electric);
      font-size: 1.8rem;
      animation: bounce 2s infinite;
    }
    @keyframes bounce {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
    }
    /* 区块通用 */
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding { padding: 70px 0; }
    }
    .section-title {
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 700;
      margin-bottom: 20px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background: var(--star-purple);
      margin-top: 10px;
    }
    /* 非对称优势 */
    .adv-large-card {
      background: var(--dark-card);
      border-radius: var(--radius-card);
      padding: 32px;
      height: 100%;
      box-shadow: var(--shadow-dark);
    }
    .adv-small-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      border-left: 4px solid var(--star-purple);
      box-shadow: var(--shadow-light);
      color: var(--text-dark);
      margin-bottom: 20px;
    }
    /* 数据数字 */
    .data-number {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      color: var(--cyan-electric);
    }
    /* 图文交错 */
    .service-img {
      background: #F2F0F5;
      border-radius: var(--radius-card);
      height: 260px;
      background-size: cover;
      background-position: center;
      box-shadow: 0 0 0 1px rgba(123,47,255,0.2);
    }
    /* 案例卡片 */
    .case-card {
      background: var(--dark-card);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: var(--transition);
      box-shadow: var(--shadow-dark);
    }
    .case-card:hover {
      transform: translateY(-6px);
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-img::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(0,229,255,0);
      transition: 0.3s;
    }
    .case-card:hover .case-img::after {
      background: rgba(0,229,255,0.25);
    }
    /* 流程线条 */
    .process-step {
      position: relative;
    }
    .process-connector {
      width: 40px;
      height: 2px;
      background: var(--cyan-electric);
      margin: 0 8px;
    }
    @media (max-width: 768px) {
      .process-connector {
        width: 2px;
        height: 30px;
        margin: 10px auto;
      }
    }
    /* FAQ */
    .accordion-custom .accordion-item {
      background: transparent;
      border: none;
      border-bottom: 1px solid #E0DCE5;
    }
    .accordion-custom .accordion-button {
      background: transparent;
      font-weight: 600;
      color: var(--text-dark);
      box-shadow: none;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--star-purple);
      background: transparent;
    }
    .accordion-custom .accordion-button:focus {
      box-shadow: 0 0 0 2px var(--star-purple);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0B0C10 0%, #4B1E8E 100%);
    }
    /* 页脚 */
    .footer-link {
      color: var(--text-muted);
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--cyan-electric);
    }
    .social-icon {
      width: 36px;
      height: 36px;
      background: var(--dark-card);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      transition: 0.2s;
    }
    .social-icon:hover {
      background: var(--star-purple);
    }