/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #E10600;
      --primary-glow: rgba(225, 6, 0, 0.4);
      --secondary: #00F0FF;
      --secondary-glow: rgba(0, 240, 255, 0.5);
      --bg-deep: #0A0C0F;
      --bg-card: #13161A;
      --bg-compare: #1A1D23;
      --border-subtle: rgba(255, 255, 255, 0.05);
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8C1;
      --text-muted: #6B7280;
      --font-title: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-data: 'JetBrains Mono', 'Fira Code', monospace;
      --radius-card: 12px;
      --radius-inner: 8px;
      --shadow-card: 0 0 0 1px var(--border-subtle), 0 2px 8px rgba(0,0,0,0.4);
      --container-max: 1280px;
      --space-section: 120px;
    }
    body {
      font-family: var(--font-title);
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      :root {
        --space-section: 80px;
      }
    }
    /* 导航 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    .main-nav.scrolled {
      background: rgba(10, 12, 15, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: -0.02em;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .logo .domain {
      font-size: 0.7rem;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0.02em;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--secondary);
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: 8px;
      font-weight: 600;
      transition: background 0.2s, box-shadow 0.2s;
      margin-left: 16px;
    }
    .nav-cta:hover {
      background: #ff1a1a;
      box-shadow: 0 0 20px var(--primary-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--bg-deep);
      z-index: 999;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 40px;
      opacity: 0;
      visibility: hidden;
      transition: 0.3s;
    }
    .mobile-menu.active {
      opacity: 1;
      visibility: visible;
    }
    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--text-primary);
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.08) 0%, transparent 45%), var(--bg-deep);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero-bg {
      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: 0.18;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      width: 100%;
    }
    .hero h1 {
      font-size: clamp(2.8rem, 6vw, 5rem);
      font-weight: 800;
      line-height: 1.1;
      color: var(--text-primary);
      margin-bottom: 24px;
      letter-spacing: -0.02em;
    }
    .hero h1 span {
      background: linear-gradient(135deg, #E10600, #FF4D4D);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 600px;
    }
    .ticker {
      background: rgba(19, 22, 26, 0.8);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 60px;
      padding: 8px 24px;
      display: inline-flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 32px;
      font-family: var(--font-data);
      font-size: 0.9rem;
      color: var(--secondary);
      backdrop-filter: blur(5px);
    }
    .ticker-dot {
      width: 8px;
      height: 8px;
      background: var(--secondary);
      border-radius: 50%;
      animation: pulse 1.5s infinite;
      box-shadow: 0 0 12px var(--secondary-glow);
    }
    @keyframes pulse { 0% { opacity: 0.6; } 50% { opacity: 1; } 100% { opacity: 0.6; } }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-inner);
      font-weight: 600;
      display: inline-block;
      transition: all 0.3s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 20px var(--primary-glow);
      background: #ff1a1a;
    }
    /* 数据看板 */
    .section {
      padding: var(--space-section) 0;
    }
    .section-title {
      font-size: clamp(2rem, 4vw, 3.2rem);
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      letter-spacing: -0.02em;
      line-height: 1.1;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      border: 1px solid transparent;
    }
    .stat-card:hover {
      border-color: rgba(0,240,255,0.3);
    }
    .stat-number {
      font-family: var(--font-data);
      font-size: 3rem;
      font-weight: 700;
      color: var(--secondary);
      text-shadow: 0 0 12px var(--secondary-glow);
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .stat-number { font-size: 2.4rem; }
    }
    /* 服务卡片 2x3 变体 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 0 0 1px rgba(0,240,255,0.4), 0 8px 20px rgba(0,0,0,0.6);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      background: #1e2229;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .service-icon img {
      width: 32px;
      height: 32px;
      object-fit: contain;
    }
    .service-text h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 8px;
    }
    .service-text p {
      color: var(--text-secondary);
      font-size: 0.95rem;
      margin-bottom: 12px;
    }
    .text-link {
      color: var(--secondary);
      font-weight: 500;
      transition: 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .text-link:hover {
      transform: translateX(4px);
      text-decoration: underline;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比 */
    .comparison {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      background: var(--bg-card);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .comp-left, .comp-right {
      padding: 40px;
    }
    .comp-left {
      background: #0f1115;
      opacity: 0.7;
      filter: grayscale(30%);
    }
    .comp-right {
      background: #12161d;
      border-left: 1px solid rgba(0,240,255,0.2);
      box-shadow: inset 0 0 30px rgba(0,240,255,0.03);
      position: relative;
    }
    .comp-right::before {
      content: "⚡";
      position: absolute;
      top: 20px;
      right: 20px;
      font-size: 1.8rem;
      color: var(--secondary);
    }
    .comp-title {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 24px;
    }
    .comp-left .comp-title { color: #6B7280; }
    .comp-right .comp-title { color: var(--secondary); }
    .comp-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      font-family: var(--font-data);
    }
    @media (max-width: 768px) {
      .comparison { grid-template-columns: 1fr; }
      .comp-right { border-left: none; }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
      transition: 0.3s;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-toggle {
      font-family: var(--font-data);
      color: var(--secondary);
      font-size: 1.2rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      padding-left: 16px;
      border-left: 2px solid var(--secondary);
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* CTA 表单 */
    .cta-block {
      background: var(--bg-compare);
      border-radius: 24px;
      padding: 60px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .cta-left h2 {
      font-size: 2.2rem;
      color: white;
      margin-bottom: 16px;
    }
    .form-group input {
      width: 100%;
      background: #0f1115;
      border: none;
      border-bottom: 2px solid #2D3239;
      padding: 14px;
      color: white;
      margin-bottom: 20px;
      transition: 0.3s;
      outline: none;
    }
    .form-group input:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 8px rgba(0,240,255,0.2);
    }
    @media (max-width: 768px) {
      .cta-block {
        grid-template-columns: 1fr;
        padding: 32px;
      }
    }
    footer {
      text-align: center;
      padding: 40px 0;
      border-top: 1px solid rgba(255,255,255,0.05);
      color: var(--text-muted);
    }