/* roulang page: index */
:root {
      --primary: #8B00FF;
      --primary-glow: #7B2FBE;
      --accent: #00E5FF;
      --bg-deep: #0A0A0F;
      --bg-card: #12121A;
      --bg-light: #F5F0FA;
      --text-white: #FFFFFF;
      --text-body: #B0B0C0;
      --text-muted: #707080;
      --border-subtle: rgba(255, 255, 255, 0.06);
      --border-light: #E0D8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.5);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-number: 'Inter', 'Poppins', sans-serif;
      --transition: 0.25s ease;
      --max-width: 1280px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    h1, h2, h3, .number-stats, .accent-text {
      color: var(--text-white);
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
      line-height: 1.4;
      color: var(--text-white);
    }
    p {
      color: var(--text-body);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      font-weight: 600;
      transition: all 0.2s ease;
    }
    /* 霓虹渐变线 */
    .neon-divider {
      height: 1px;
      width: 100%;
      background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 50%, transparent 100%);
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(10, 10, 15, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      background-clip: padding-box;
      border-image: linear-gradient(90deg, var(--primary), var(--accent), transparent) 1;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-white);
      text-shadow: 0 0 12px var(--accent);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.8rem;
      text-shadow: 0 0 10px var(--accent);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-menu a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
    }
    .nav-menu a.active {
      color: var(--accent);
    }
    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
      box-shadow: 0 0 10px var(--accent);
    }
    .btn-primary-sm {
      background: var(--primary);
      color: white;
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      font-weight: 600;
    }
    .btn-primary-sm:hover {
      background: var(--accent);
      color: #0A0A0F;
      box-shadow: var(--shadow-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--header-height);
      left: 0;
      width: 100%;
      background: #0A0A0F;
      padding: 24px;
      flex-direction: column;
      gap: 20px;
      border-bottom: 1px solid var(--border-subtle);
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 1.1rem;
      color: var(--text-body);
      padding-left: 12px;
      border-left: 3px solid transparent;
    }
    .mobile-menu a:hover {
      color: var(--accent);
      border-left-color: var(--accent);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1a1030 0%, #0A0A0F 80%);
      position: relative;
      overflow: hidden;
      padding-top: var(--header-height);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 40px;
    }
    .hero-content {
      max-width: 600px;
    }
    .hero h1 {
      margin-bottom: 20px;
    }
    .hero p {
      font-size: 1.1rem;
      margin-bottom: 32px;
      color: #B0B0C0;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 15px rgba(139,0,255,0.4);
    }
    .btn-primary:hover {
      background: var(--accent);
      color: #0A0A0F;
      box-shadow: var(--shadow-glow);
    }
    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }
    .btn-ghost:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: rgba(0,229,255,0.05);
    }
    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      border-radius: 16px;
      mask-image: linear-gradient(to bottom, black 60%, transparent);
      width: 100%;
      height: auto;
    }
    .scroll-down {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--accent);
      font-size: 1.8rem;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(8px); }
      100% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .feature-item {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: 0.3s;
    }
    .feature-item:hover {
      border-color: rgba(0,229,255,0.3);
      background: #1A1A24;
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--accent);
      margin-bottom: 16px;
    }
    /* 服务卡片 交错网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: #12121A;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: all 0.3s;
    }
    .service-card.large {
      grid-column: span 2;
    }
    .service-card:hover {
      border-color: rgba(0,229,255,0.4);
      box-shadow: 0 0 18px rgba(0,229,255,0.15);
      transform: translateY(-6px);
    }
    .card-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .card-img::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(to top, #0A0A0F, transparent);
    }
    .card-body {
      padding: 24px;
    }
    .text-link {
      color: var(--accent);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 8px;
    }
    .text-link i {
      transition: transform 0.2s;
    }
    .text-link:hover i {
      transform: translateX(6px);
    }
    /* 数据亮点 */
    .stats-bar {
      background: #12121A;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      padding: 48px 24px;
      border-radius: var(--radius-card);
      margin-top: 24px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      font-family: var(--font-number);
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    .case-card {
      background: #12121A;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
    }
    .case-card img {
      height: 220px;
      object-fit: cover;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
    }
    .step {
      flex:1;
      position: relative;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      border: 2px solid var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
      font-weight: 700;
      color: white;
    }
    /* FAQ */
    .faq-section {
      background: #F5F0FA;
      color: #0A0A0F;
    }
    .faq-item {
      background: white;
      border: 1px solid #E0D8F0;
      border-radius: 8px;
      margin-bottom: 12px;
      padding: 18px 24px;
      cursor: pointer;
    }
    .faq-item.active {
      border-left: 4px solid var(--accent);
    }
    /* 联系 */
    .contact-card {
      background: #12121A;
      border: 1px solid var(--accent);
      border-radius: 20px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      padding: 48px;
    }
    input, textarea {
      background: #0A0A0F;
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 6px;
      padding: 12px;
      color: white;
      width: 100%;
      margin-bottom: 16px;
    }
    input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 10px var(--accent);
    }
    footer {
      background: #0A0A0F;
      padding: 60px 0 20px;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .service-card.large { grid-column: span 1; }
      .cases-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 767px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .services-grid, .features-grid { grid-template-columns: 1fr; }
      .contact-card { grid-template-columns: 1fr; }
      .steps { flex-direction: column; gap: 30px; }
    }