/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --bg-deep: #0B0C10;
      --bg-card: #1E1E2E;
      --bg-section-alt: #14151F;
      --neon-cyan: #00F0FF;
      --energy-orange: #FF6B35;
      --orange-light: #FF8C5A;
      --text-primary: #E0E0F0;
      --text-secondary: #B0B0C0;
      --text-dim: #7A7A8A;
      --border-neon-dim: rgba(0, 240, 255, 0.15);
      --border-neon-glow: rgba(0, 240, 255, 0.6);
      --shadow-neon: 0 0 20px rgba(0, 240, 255, 0.25);
      --shadow-orange: 0 0 25px rgba(255, 107, 53, 0.7);
      --radius-card: 24px;
      --radius-button: 40px;
      --radius-badge: 20px;
      
      --font-inter: 'Inter', system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-inter);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }
    button, input, textarea {
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* ----- 霓虹文字效果 ----- */
    .neon-text {
      color: var(--neon-cyan);
      text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
    }

    /* ----- 导航栏（固定暗色霓虹）----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-neon-dim);
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #00F0FF 0%, #8A6EFF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 10px rgba(0,240,255,0.5);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: #CCCCCC;
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--neon-cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
      transition: width 0.3s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--energy-orange);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.3s, box-shadow 0.3s;
      margin-left: 16px;
    }
    .btn-nav:hover {
      background: var(--orange-light);
      box-shadow: var(--shadow-orange);
    }

    /* 汉堡菜单（移动端） */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--neon-cyan);
      border-radius: 2px;
      transition: all 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(11,12,16,0.96);
      backdrop-filter: blur(16px);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      border-bottom: 1px solid var(--border-neon-dim);
      z-index: 999;
    }
    .mobile-menu a {
      color: #CCC;
      font-size: 18px;
      font-weight: 500;
      padding: 12px 0;
      border-bottom: 1px solid rgba(0,240,255,0.15);
    }
    .mobile-menu .btn-nav {
      margin-left: 0;
      text-align: center;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
    }

    /* ----- 板块通用间距 ----- */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section { padding: 70px 0; }
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 20px;
      color: white;
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 48px;
      max-width: 700px;
    }

    /* ----- Hero 首屏 ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0B0C10 0%, #1A1A2E 100%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.2;
      background: linear-gradient(to right, #00F0FF, #B56EFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 15px rgba(0,240,255,0.5);
      margin-bottom: 24px;
    }
    .hero p {
      font-size: 18px;
      color: #C0C0D0;
      margin-bottom: 36px;
    }
    .badge-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .stat-badge {
      background: rgba(30,30,46,0.7);
      border: 1px solid var(--border-neon-dim);
      border-radius: 16px;
      padding: 12px 20px;
      color: var(--energy-orange);
      font-weight: 700;
      font-size: 20px;
      backdrop-filter: blur(4px);
    }
    .btn-primary {
      background: var(--energy-orange);
      color: white;
      border: none;
      padding: 16px 40px;
      border-radius: var(--radius-button);
      font-weight: 700;
      font-size: 18px;
      cursor: pointer;
      transition: all 0.3s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--orange-light);
      box-shadow: var(--shadow-orange);
      transform: translateY(-2px);
    }
    .hero-image img {
      border-radius: 32px;
      box-shadow: 0 0 30px rgba(0,240,255,0.2);
    }
    @media (max-width: 768px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero h1 { font-size: 36px; }
      .badge-group { justify-content: center; }
    }

    /* ----- 数据指标看板 ----- */
    .data-dashboard {
      background: #0f1018;
      background-image: radial-gradient(circle at 20% 30%, #1a1b2e 0%, #0B0C10 90%);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    .metric-card {
      background: rgba(30,30,46,0.6);
      border: 1px solid var(--border-neon-dim);
      border-radius: 24px;
      padding: 32px 20px;
      text-align: center;
      transition: all 0.3s;
    }
    .metric-card:hover {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 25px rgba(0,240,255,0.25);
      transform: translateY(-6px);
    }
    .metric-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--energy-orange);
      text-shadow: 0 0 8px rgba(255,107,53,0.5);
    }
    .metric-label {
      color: #B0B0C0;
      margin-top: 12px;
      font-size: 16px;
    }
    @media (max-width: 768px) {
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
      .metrics-grid { grid-template-columns: 1fr; }
    }

    /* ----- 服务矩阵 ----- */
    .services {
      background: var(--bg-deep);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-neon-dim);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all 0.3s;
      position: relative;
      overflow: hidden;
    }
    .service-card:hover {
      border-color: var(--neon-cyan);
      box-shadow: var(--shadow-neon);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 32px;
      color: var(--neon-cyan);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-desc {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 20px;
    }
    .data-tag {
      background: rgba(255,107,53,0.15);
      color: var(--energy-orange);
      border-radius: 20px;
      padding: 4px 14px;
      font-weight: 600;
      font-size: 14px;
      display: inline-block;
    }
    @media (max-width: 768px) {
      .services-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .services-grid { grid-template-columns: 1fr; }
    }

    /* ----- 案例对比卡片 ----- */
    .cases {
      background: #11121C;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 24px;
      align-items: center;
    }
    .case-card {
      background: #1A1B2A;
      border-radius: 24px;
      padding: 32px;
      border: 1px solid #2A2A3A;
    }
    .case-card.after {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 18px rgba(0,240,255,0.15);
    }
    .case-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .metric-big {
      font-size: 38px;
      font-weight: 800;
    }
    .vs-divider {
      font-size: 32px;
      font-weight: 900;
      color: var(--neon-cyan);
      text-shadow: 0 0 10px cyan;
    }
    @media (max-width: 768px) {
      .compare-grid { grid-template-columns: 1fr; }
      .vs-divider { text-align: center; }
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-item {
      background: rgba(30,30,46,0.5);
      border-left: 4px solid #3A3A4A;
      border-radius: 12px;
      margin-bottom: 16px;
      transition: all 0.3s;
    }
    .faq-item.active {
      border-left-color: var(--neon-cyan);
      box-shadow: 0 0 18px rgba(0,240,255,0.2);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
      color: #B0B0C0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* ----- CTA 转化区 ----- */
    .cta-section {
      background: #0B0C10;
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .cta-form input, .cta-form textarea {
      width: 100%;
      background: #12131C;
      border: 1px solid #2A2A3E;
      border-radius: 16px;
      padding: 14px;
      margin-bottom: 16px;
      color: white;
      transition: 0.2s;
    }
    .cta-form input:focus {
      border-color: var(--energy-orange);
      box-shadow: 0 0 15px rgba(255,107,53,0.4);
    }
    .trust-badge {
      display: flex;
      gap: 24px;
      color: var(--text-dim);
      margin-top: 20px;
    }
    @media (max-width: 768px) {
      .cta-grid { grid-template-columns: 1fr; }
    }

    /* 页脚 */
    .footer {
      background: #090A0F;
      padding: 40px 0;
      border-top: 1px solid rgba(0,240,255,0.15);
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .footer-links a {
      color: #AAA;
      margin-right: 24px;
      font-size: 15px;
    }