/* roulang page: index */
:root {
      --primary: #5C33F6;
      --primary-dark: #2A2438;
      --accent: #00F5A0;
      --accent-hover: #00d68b;
      --bg-light: #F8F9FD;
      --bg-white: #FFFFFF;
      --bg-dark: #13101E;
      --bg-dark-card: #1E1A2E;
      --text-main: #232035;
      --text-muted: #67637E;
      --text-light: #A5A2B8;
      --border-color: rgba(92, 51, 246, 0.1);
      --border-dark: rgba(255, 255, 255, 0.08);
      --shadow-sm: 0 4px 12px rgba(42, 36, 56, 0.04);
      --shadow-md: 0 10px 30px -10px rgba(42, 36, 56, 0.08);
      --shadow-lg: 0 20px 40px -15px rgba(92, 51, 246, 0.15);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: all 0.25s ease-in-out;
      --max-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Top Bar */
    .top-bar {
      background-color: var(--primary-dark);
      color: var(--text-light);
      font-size: 0.85rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--accent);
      font-weight: 500;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
    }

    /* Header Nav */
    .site-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.02em;
    }
    .logo-badge {
      background: linear-gradient(135deg, var(--primary), #8F00FF);
      color: #fff;
      padding: 4px 8px;
      border-radius: var(--radius-sm);
      font-size: 0.8rem;
    }
    .nav-links {
      display: flex;
      list-style: none;
      gap: 24px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
      min-height: 44px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(92, 51, 246, 0.35);
    }
    .btn-primary:hover {
      background-color: #4a24db;
      transform: translateY(-2px);
    }
    .btn-accent {
      background-color: var(--accent);
      color: var(--primary-dark);
      box-shadow: 0 4px 14px rgba(0, 245, 160, 0.3);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--border-color);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(92, 51, 246, 0.04);
    }
    .btn-outline-white {
      background-color: transparent;
      border-color: rgba(255, 255, 255, 0.2);
      color: #FFFFFF;
    }
    .btn-outline-white:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    /* Section Global Styles */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }
    .section-white {
      background-color: var(--bg-white);
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--primary);
      background: rgba(92, 51, 246, 0.08);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .section-dark .section-tag {
      background: rgba(0, 245, 160, 0.15);
      color: var(--accent);
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 16px;
      color: var(--primary-dark);
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .section-dark .section-desc {
      color: var(--text-light);
    }

    /* Hero Section (Blueprint A) */
    .hero-section {
      background: radial-gradient(circle at top right, rgba(92, 51, 246, 0.12), transparent 50%),
                  linear-gradient(180deg, #FFFFFF 0%, var(--bg-light) 100%);
      padding: 70px 0 90px 0;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.7rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--primary-dark);
      margin-bottom: 20px;
    }
    .hero-content h1 span {
      background: linear-gradient(135deg, var(--primary), #9B51E0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.05rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.8;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }
    .hero-badges span {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-badges span::before {
      content: '✓';
      color: var(--primary);
      font-weight: bold;
    }
    .hero-mockup-card {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      overflow: hidden;
      position: relative;
    }
    .hero-mockup-head {
      background: #F1F3F9;
      padding: 12px 18px;
      display: flex;
      gap: 6px;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .mock-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #D8DCE6;
    }
    .hero-mockup-img {
      width: 100%;
      display: block;
      object-fit: cover;
    }

    /* Section 2: Tech Specs (双栏) */
    .tech-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .tech-card-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .tech-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      padding: 20px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .tech-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }
    .tech-item h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .tech-item p {
      font-size: 0.95rem;
      color: var(--text-muted);
    }
    .tech-img-box {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    /* Section 3: Advantage Matrix (3x2 Grid) */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-white);
      padding: 32px 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .adv-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary);
    }
    .adv-icon-badge {
      width: 48px;
      height: 48px;
      background: rgba(92, 51, 246, 0.08);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 20px;
    }
    .adv-card h3 {
      font-size: 1.2rem;
      color: var(--primary-dark);
      margin-bottom: 12px;
    }
    .adv-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 4: Product Editions (3 Cards) */
    .edition-card {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px 30px;
      position: relative;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .edition-card.featured {
      border-color: var(--primary);
      box-shadow: 0 12px 35px rgba(92, 51, 246, 0.15);
      transform: scale(1.03);
      z-index: 2;
    }
    .edition-badge {
      position: absolute;
      top: -14px;
      right: 28px;
      background: var(--accent);
      color: var(--primary-dark);
      font-size: 0.8rem;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
    }
    .edition-head h3 {
      font-size: 1.4rem;
      color: var(--primary-dark);
      margin-bottom: 8px;
    }
    .edition-head p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      min-height: 45px;
    }
    .edition-features {
      list-style: none;
      margin-bottom: 30px;
      flex-grow: 1;
    }
    .edition-features li {
      font-size: 0.92rem;
      color: var(--text-main);
      padding: 8px 0;
      border-bottom: 1px dashed rgba(0,0,0,0.06);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .edition-features li::before {
      content: '✓';
      color: var(--primary);
      font-weight: bold;
    }

    /* Section 5: Dark Architecture Flow */
    .arch-flow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .arch-step-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      position: relative;
    }
    .arch-step-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 12px;
      opacity: 0.85;
    }
    .arch-step-card h3 {
      font-size: 1.15rem;
      color: #FFFFFF;
      margin-bottom: 10px;
    }
    .arch-step-card p {
      font-size: 0.9rem;
      color: var(--text-light);
      line-height: 1.6;
    }

    /* Section 6: Scenarios (图文交错) */
    .scenario-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
      margin-bottom: 60px;
    }
    .scenario-item:last-child {
      margin-bottom: 0;
    }
    .scenario-item.reverse {
      direction: rtl;
    }
    .scenario-item.reverse .scenario-text {
      direction: ltr;
    }
    .scenario-item.reverse .scenario-media {
      direction: ltr;
    }
    .scenario-media img {
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .scenario-text h3 {
      font-size: 1.5rem;
      color: var(--primary-dark);
      margin-bottom: 14px;
    }
    .scenario-text p {
      font-size: 0.98rem;
      color: var(--text-muted);
      margin-bottom: 18px;
    }
    .scenario-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .tag-pill {
      background: rgba(92, 51, 246, 0.06);
      color: var(--primary);
      font-size: 0.85rem;
      padding: 4px 12px;
      border-radius: 4px;
      font-weight: 500;
    }

    /* Section 7: Statistics Banner (数据条) */
    .stat-bar {
      background: linear-gradient(135deg, var(--primary-dark), #1A162B);
      color: #FFFFFF;
      padding: 60px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 6px;
      line-height: 1.1;
    }
    .stat-label {
      font-size: 0.95rem;
      color: var(--text-light);
    }

    /* Section 8: Testimonials */
    .review-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #FFB800;
      margin-bottom: 14px;
      font-size: 1rem;
    }
    .review-content {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }
    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid rgba(0,0,0,0.05);
      padding-top: 16px;
    }
    .reviewer-avatar {
      width: 44px;
      height: 44px;
      background: var(--primary);
      color: #fff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }
    .reviewer-meta h4 {
      font-size: 0.95rem;
      color: var(--primary-dark);
    }
    .reviewer-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* Section 9: News / Insights */
    .news-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .news-img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-date {
      font-size: 0.8rem;
      color: var(--text-light);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .news-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 0.9rem;
      color: var(--primary);
      font-weight: 600;
    }

    /* Section 10: FAQ Hand Accordion */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--primary-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      transition: var(--transition);
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--primary);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.8;
      background-color: #FAFAFC;
    }
    .faq-item.active .faq-answer {
      padding: 16px 24px 24px 24px;
      max-height: 200px;
    }

    /* Section 11: Trust & SLA Bar */
    .trust-bar {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 40px 0;
    }
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .trust-item {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .trust-icon-box {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(92, 51, 246, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      flex-shrink: 0;
    }
    .trust-text h4 {
      font-size: 1rem;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }
    .trust-text p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* Section 12: Contact CTA & Form */
    .cta-container {
      background: linear-gradient(135deg, var(--primary-dark), #3C227E);
      border-radius: var(--radius-lg);
      padding: 60px 48px;
      color: #FFFFFF;
      box-shadow: var(--shadow-lg);
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 50px;
      align-items: center;
    }
    .cta-info h2 {
      font-size: 2.2rem;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .cta-info p {
      font-size: 1rem;
      color: var(--text-light);
      margin-bottom: 24px;
      line-height: 1.7;
    }
    .cta-form {
      background: #FFFFFF;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      color: var(--text-main);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--primary-dark);
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      font-size: 0.95rem;
      border: 1px solid #D5D9E2;
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background-color: #FAFAFC;
    }
    .form-control:focus {
      border-color: var(--primary);
      background-color: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(92, 51, 246, 0.1);
    }
    .form-notice {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-top: 10px;
      text-align: center;
    }

    /* Footer */
    .site-footer {
      background-color: var(--bg-dark);
      color: var(--text-light);
      padding: 70px 0 24px 0;
      border-top: 1px solid var(--border-dark);
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h3 {
      font-size: 1.25rem;
      color: #FFFFFF;
      margin-bottom: 14px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .footer-col h4 {
      font-size: 1.05rem;
      color: #FFFFFF;
      margin-bottom: 18px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-dark);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
    }

    /* Mobile Menu Toggle */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--primary-dark);
    }

    /* Responsive Queries */
    @media (max-width: 992px) {
      .hero-grid,
      .tech-grid,
      .cta-container {
        grid-template-columns: 1fr;
      }
      .grid-3,
      .arch-flow-grid,
      .stat-grid,
      .trust-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .scenario-item,
      .scenario-item.reverse {
        grid-template-columns: 1fr;
        direction: ltr !important;
      }
      .scenario-item.reverse .scenario-text,
      .scenario-item.reverse .scenario-media {
        direction: ltr !important;
      }
      .edition-card.featured {
        transform: none;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .grid-3,
      .arch-flow-grid,
      .stat-grid,
      .trust-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 2.1rem;
      }
      .section-title {
        font-size: 1.7rem;
      }
      .top-bar-left {
        display: none;
      }
      .top-bar .container {
        justify-content: center;
      }
      .cta-container {
        padding: 36px 20px;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }