/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary-bg: #0A0E17;
      --surface-color: #141B26;
      --surface-light: #1A2230;
      --accent-cyan: #00F0FF;
      --accent-orange: #FF6B35;
      --text-primary: #FFFFFF;
      --text-body: #B0B8C8;
      --text-muted: #6B7280;
      --text-dark: #4B5563;
      --border-subtle: rgba(0, 240, 255, 0.06);
      --border-cyan: rgba(0, 240, 255, 0.15);
      --border-active: rgba(0, 240, 255, 0.25);
      --success: #10B981;
      --danger: #EF4444;
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
      --shadow-glow-cyan: 0 0 20px rgba(0, 240, 255, 0.3);
      --shadow-glow-orange: 0 0 24px rgba(255, 107, 53, 0.6);
      --font-inter: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-inter);
      background-color: var(--primary-bg);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
      background: none;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background-color: var(--primary-bg);
      border-bottom: 1px solid var(--border-cyan);
      z-index: 1000;
      transition: background-color 0.3s;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      padding: 0 1.5rem;
    }

    .logo {
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--accent-cyan);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent-cyan);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-bg);
      font-weight: 800;
      font-size: 1.2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-link {
      color: rgba(255,255,255,0.7);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.5rem 0;
      position: relative;
      transition: color var(--transition-smooth);
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--accent-cyan);
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-cyan);
      box-shadow: var(--shadow-glow-cyan);
      border-radius: 2px;
    }

    .nav-cta {
      background: var(--accent-orange);
      color: #fff;
      font-weight: 600;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-sm);
      transition: box-shadow var(--transition-smooth), transform var(--transition-smooth);
    }

    .nav-cta:hover {
      box-shadow: 0 0 20px rgba(255, 107, 53, 0.5);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 10px;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: var(--transition-smooth);
    }

    .mobile-menu {
      display: none;
      position: absolute;
      top: 70px;
      left: 0;
      width: 100%;
      background: var(--primary-bg);
      border-bottom: 1px solid var(--border-cyan);
      padding: 1rem 0;
      flex-direction: column;
      gap: 0.5rem;
      box-shadow: 0 8px 20px rgba(0,0,0,0.5);
    }

    .mobile-menu a {
      padding: 0.75rem 1.5rem;
      color: rgba(255,255,255,0.7);
      font-weight: 500;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }

    .mobile-menu a:hover,
    .mobile-menu a.active {
      color: var(--accent-cyan);
      border-left-color: var(--accent-cyan);
      background: rgba(0,240,255,0.03);
    }

    /* Hero 首屏 */
    .hero {
      padding: 8rem 0 5rem;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      position: relative;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(10,14,23,0.92) 0%, rgba(10,14,23,0.7) 60%, rgba(10,14,23,0.4) 100%);
      z-index: 0;
    }

    .hero .container {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      margin-bottom: 1.5rem;
      max-width: 600px;
    }

    .hero-content h1 span {
      color: var(--accent-cyan);
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-body);
      max-width: 540px;
      margin-bottom: 2rem;
      line-height: 1.6;
    }

    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: #fff;
      font-weight: 600;
      padding: 0.875rem 2rem;
      border-radius: var(--radius-sm);
      transition: all var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-glow-orange);
      transform: scale(1.02);
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 0.875rem 2rem;
      border-radius: var(--radius-sm);
      transition: all var(--transition-smooth);
      cursor: pointer;
    }

    .btn-secondary:hover {
      background: rgba(0,240,255,0.08);
      box-shadow: 0 0 15px rgba(0,240,255,0.2);
    }

    .hero-dashboard {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      align-content: center;
    }

    .stat-card {
      background: var(--surface-color);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-lg);
      padding: 1.5rem 1.2rem;
      text-align: center;
      transition: all var(--transition-smooth);
    }

    .stat-number {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--accent-orange);
      line-height: 1.2;
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
      margin-top: 0.25rem;
    }

    /* 通用板块标题 */
    .section {
      padding: 5rem 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 3.5rem;
    }

    .section-header h2 {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.3;
      margin-bottom: 0.75rem;
    }

    .section-header p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
      font-size: 1.1rem;
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .advantage-card {
      background: var(--surface-color);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      border-left: 4px solid var(--accent-cyan);
      box-shadow: var(--shadow-card);
      transition: all var(--transition-smooth);
      position: relative;
    }

    .advantage-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 32px rgba(0, 240, 255, 0.1);
    }

    .advantage-icon {
      font-size: 2rem;
      color: var(--accent-cyan);
      margin-bottom: 1rem;
    }

    .advantage-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 0.75rem;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .service-card {
      background: var(--surface-color);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: all var(--transition-smooth);
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 32px rgba(0, 240, 255, 0.12);
      border-color: var(--border-active);
    }

    .service-img {
      aspect-ratio: 16 / 9;
      background: var(--surface-light);
      object-fit: cover;
      width: 100%;
    }

    .service-body {
      padding: 1.5rem;
    }

    .service-body h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }

    .service-body p {
      color: var(--text-body);
      margin-bottom: 1rem;
      font-size: 0.95rem;
    }

    .tag {
      background: rgba(0, 240, 255, 0.08);
      color: var(--accent-cyan);
      padding: 0.2rem 0.75rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
    }

    /* 数据对比 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      background: var(--surface-color);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      border: 1px solid var(--border-subtle);
    }

    .compare-col h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 2rem;
      color: var(--text-primary);
    }

    .compare-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1rem 0;
      border-bottom: 1px dashed rgba(255,255,255,0.08);
    }

    .compare-label {
      font-weight: 500;
      color: var(--text-body);
    }

    .progress-bar {
      width: 120px;
      height: 8px;
      background: #374151;
      border-radius: 4px;
      overflow: hidden;
    }

    .progress-fill {
      height: 100%;
      background: var(--accent-cyan);
      border-radius: 4px;
      width: 0%;
    }

    .progress-orange {
      background: linear-gradient(90deg, var(--accent-cyan), var(--accent-orange));
    }

    .compare-value {
      font-weight: 700;
      color: var(--text-primary);
      margin-left: 0.5rem;
    }

    .compare-old .compare-value {
      color: var(--text-muted);
    }

    .text-success {
      color: var(--success);
      font-weight: 600;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
    }

    .faq-item {
      background: var(--surface-color);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: background var(--transition-smooth);
    }

    .faq-item.active {
      background: var(--surface-light);
      border-left: 3px solid var(--accent-cyan);
    }

    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.25rem 1.5rem;
      font-weight: 600;
      color: var(--text-primary);
      cursor: pointer;
      transition: 0.2s;
    }

    .faq-icon {
      font-size: 1.5rem;
      color: var(--accent-cyan);
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 1.5rem;
    }

    .faq-answer p {
      padding-bottom: 1.25rem;
      color: var(--text-body);
    }

    /* CTA */
    .cta-section {
      background-color: var(--primary-bg);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 5rem 0;
    }

    .cta-overlay {
      position: absolute;
      inset: 0;
      background: rgba(10,14,23,0.85);
      backdrop-filter: blur(3px);
    }

    .cta-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .cta-text h2 {
      font-size: 2rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 1rem;
    }

    .cta-text p {
      color: var(--text-body);
      font-size: 1.1rem;
    }

    .cta-form {
      background: var(--surface-color);
      padding: 2rem;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-cyan);
    }

    .form-group {
      margin-bottom: 1.25rem;
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      background: var(--surface-light);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-sm);
      padding: 0.75rem 1rem;
      color: #fff;
      transition: 0.2s;
    }

    .form-group input:focus,
    .form-group textarea:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 0 3px rgba(0,240,255,0.1);
    }

    .btn-submit {
      width: 100%;
      background: var(--accent-orange);
      color: #fff;
      font-weight: 600;
      padding: 0.875rem;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all var(--transition-smooth);
    }

    .btn-submit:hover {
      box-shadow: var(--shadow-glow-orange);
      transform: scale(1.02);
    }

    /* Footer */
    .footer {
      background: #060A10;
      border-top: 1px solid rgba(0,240,255,0.1);
      padding: 3rem 0 1.5rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    .footer-brand p {
      color: var(--text-muted);
      margin-top: 0.5rem;
      font-size: 0.9rem;
    }

    .footer-col h4 {
      color: #fff;
      font-weight: 600;
      margin-bottom: 1rem;
    }

    .footer-col a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
      transition: 0.2s;
    }

    .footer-col a:hover {
      color: var(--accent-cyan);
    }

    .copyright {
      margin-top: 2rem;
      padding-top: 1.5rem;
      border-top: 1px solid rgba(255,255,255,0.05);
      color: var(--text-dark);
      font-size: 0.8rem;
      text-align: center;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero .container { grid-template-columns: 1fr; }
      .hero-dashboard { grid-template-columns: repeat(4, 1fr); }
      .advantages-grid { grid-template-columns: 1fr 1fr; }
      .services-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      .hero-content h1 { font-size: 2.5rem; }
      .advantages-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .comparison-wrapper { grid-template-columns: 1fr; }
      .cta-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-dashboard { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 480px) {
      .hero-content h1 { font-size: 2rem; }
      .section-header h2 { font-size: 1.75rem; }
      .footer-grid { grid-template-columns: 1fr; }
    }