/* roulang page: index */
:root {
      --bg-deep: #0B1120;
      --bg-surface: #0F172A;
      --brand-primary: #0EA5E9;
      --brand-cyan: #38BDF8;
      --brand-accent: #6366F1;
      --brand-success: #10B981;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --text-sub: #64748B;
      --card-bg: rgba(30, 41, 59, 0.72);
      --card-border: rgba(255, 255, 255, 0.08);
      --card-border-hover: rgba(56, 189, 248, 0.45);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-card: 0 20px 25px -5px rgba(0, 0, 0, 0.35);
      --glow-btn: 0 0 20px rgba(14, 165, 233, 0.45);
      --glow-btn-hover: 0 0 32px rgba(56, 189, 248, 0.7);
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-main);
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .header-top {
      background: rgba(11, 17, 32, 0.95);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      font-size: 0.82rem;
      color: var(--text-sub);
      padding: 8px 0;
    }
    .header-top .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
    }
    .header-top span b {
      color: var(--brand-cyan);
    }
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--card-border);
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }
    .brand-logo-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      font-weight: bold;
      color: #fff;
      box-shadow: 0 0 12px rgba(14, 165, 233, 0.4);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 24px;
    }
    .nav-menu a {
      color: var(--text-muted);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 6px 12px;
      border-radius: var(--radius-sm);
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--brand-cyan);
      background: rgba(56, 189, 248, 0.08);
    }
    .glow-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
      color: #fff;
      font-weight: 600;
      font-size: 0.92rem;
      border-radius: 9999px;
      border: none;
      box-shadow: var(--glow-btn);
      cursor: pointer;
      transition: all 0.3s ease;
      white-space: nowrap;
    }
    .glow-btn:hover {
      box-shadow: var(--glow-btn-hover);
      transform: translateY(-2px);
      filter: brightness(1.1);
    }
    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: var(--text-main);
      font-weight: 500;
      font-size: 0.92rem;
      border-radius: 9999px;
      cursor: pointer;
      transition: all 0.3s ease;
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--brand-cyan);
      color: var(--brand-cyan);
    }
    section.page-section {
      padding: 86px 0;
      position: relative;
    }
    section.section-alt {
      background: rgba(15, 23, 42, 0.55);
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
      margin-bottom: 54px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.78rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--brand-cyan);
      background: rgba(56, 189, 248, 0.1);
      padding: 4px 12px;
      border-radius: 9999px;
      margin-bottom: 12px;
      border: 1px solid rgba(56, 189, 248, 0.25);
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .glass-card:hover {
      border-color: var(--card-border-hover);
      transform: translateY(-4px);
    }
    .hero-banner {
      position: relative;
      padding: 90px 0 100px;
      background: linear-gradient(180deg, rgba(11, 17, 32, 0.65) 0%, rgba(15, 23, 42, 0.95) 100%), url('/assets/images/84a6972efd418f30.webp') center/cover no-repeat;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      color: #fff;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-h1 span {
      background: linear-gradient(135deg, var(--brand-cyan), var(--brand-accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-intro {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 32px;
    }
    .hero-btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-code-block {
      background: rgba(15, 23, 42, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
    .code-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      padding-bottom: 12px;
      margin-bottom: 16px;
    }
    .code-dots {
      display: flex;
      gap: 6px;
    }
    .code-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.2);
    }
    .code-title {
      font-size: 0.8rem;
      color: var(--text-sub);
      font-family: monospace;
    }
    .code-content {
      font-family: Consolas, Monaco, "Courier New", monospace;
      font-size: 0.88rem;
      line-height: 1.7;
      color: #E2E8F0;
    }
    .code-key { color: var(--brand-cyan); }
    .code-str { color: #A7F3D0; }
    .code-comment { color: var(--text-sub); }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      padding: 28px 22px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .metric-val {
      font-size: 2.5rem;
      font-weight: 800;
      color: #fff;
      margin-bottom: 6px;
      letter-spacing: -1px;
    }
    .metric-val span {
      font-size: 1.25rem;
      color: var(--brand-cyan);
      margin-left: 2px;
    }
    .metric-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .metric-desc {
      font-size: 0.82rem;
      color: var(--text-sub);
    }
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .overview-img-wrap {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--card-border);
      box-shadow: 0 20px 30px rgba(0, 0, 0, 0.4);
    }
    .overview-content h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 18px;
      line-height: 1.4;
      color: #fff;
    }
    .overview-content p {
      font-size: 0.96rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 20px;
    }
    .compliance-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }
    .compliance-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.85rem;
      color: var(--text-main);
    }
    .compliance-badge i {
      color: var(--brand-success);
    }
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .matrix-card {
      padding: 30px 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .matrix-header {
      margin-bottom: 16px;
    }
    .matrix-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: rgba(14, 165, 233, 0.12);
      border: 1px solid rgba(14, 165, 233, 0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--brand-cyan);
      font-size: 1.2rem;
      margin-bottom: 16px;
    }
    .matrix-card h4 {
      font-size: 1.18rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 10px;
    }
    .matrix-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .programs-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .program-card {
      padding: 36px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .program-card.featured {
      border-color: rgba(56, 189, 248, 0.5);
      background: rgba(30, 41, 59, 0.85);
      box-shadow: 0 0 35px rgba(14, 165, 233, 0.2);
    }
    .featured-tag {
      position: absolute;
      top: -12px;
      right: 24px;
      background: linear-gradient(135deg, var(--brand-cyan), var(--brand-accent));
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 9999px;
      color: #fff;
    }
    .program-title {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .program-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.6;
    }
    .program-features {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
    }
    .program-features li {
      font-size: 0.88rem;
      color: var(--text-main);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .program-features li span {
      color: var(--brand-cyan);
      font-weight: bold;
    }
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .comparison-card {
      padding: 36px 30px;
      border-radius: var(--radius-md);
    }
    .comparison-card.pre {
      background: rgba(15, 23, 42, 0.6);
      border: 1px solid rgba(255, 255, 255, 0.06);
    }
    .comparison-card.post {
      background: rgba(30, 41, 59, 0.7);
      border: 1px solid rgba(16, 185, 129, 0.3);
      box-shadow: 0 0 25px rgba(16, 185, 129, 0.1);
    }
    .comparison-card h4 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .comparison-item {
      margin-bottom: 18px;
    }
    .comparison-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      display: flex;
      justify-content: space-between;
      margin-bottom: 6px;
    }
    .progress-bar-bg {
      height: 8px;
      background: rgba(255, 255, 255, 0.08);
      border-radius: 9999px;
      overflow: hidden;
    }
    .progress-bar-fill {
      height: 100%;
      border-radius: 9999px;
    }
    .timeline-wrap {
      position: relative;
      max-width: 900px;
      margin: 0 auto;
    }
    .timeline-wrap::before {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 50%;
      width: 2px;
      background: rgba(255, 255, 255, 0.08);
      transform: translateX(-50%);
    }
    .timeline-node {
      position: relative;
      margin-bottom: 40px;
      width: 50%;
      padding: 0 30px;
    }
    .timeline-node.left {
      left: 0;
      text-align: right;
    }
    .timeline-node.right {
      left: 50%;
      text-align: left;
    }
    .timeline-dot {
      position: absolute;
      top: 10px;
      width: 14px;
      height: 14px;
      background: var(--brand-cyan);
      border: 3px solid var(--bg-deep);
      border-radius: 50%;
      box-shadow: 0 0 10px var(--brand-cyan);
    }
    .timeline-node.left .timeline-dot {
      right: -7px;
    }
    .timeline-node.right .timeline-dot {
      left: -7px;
    }
    .timeline-box {
      padding: 20px 24px;
    }
    .timeline-time {
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--brand-cyan);
      margin-bottom: 6px;
    }
    .timeline-title {
      font-size: 1.08rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: #fff;
    }
    .timeline-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .stories-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .story-card {
      padding: 32px 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .story-user {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 18px;
    }
    .story-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.4), rgba(99, 102, 241, 0.4));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
    }
    .story-meta h5 {
      font-size: 1rem;
      font-weight: 600;
      color: #fff;
    }
    .story-meta span {
      font-size: 0.8rem;
      color: var(--text-sub);
    }
    .story-body {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .story-review {
      background: rgba(15, 23, 42, 0.5);
      border-left: 3px solid var(--brand-cyan);
      padding: 12px 16px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      font-size: 0.84rem;
      color: var(--text-sub);
    }
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      padding: 26px 22px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-stars {
      color: #FBBF24;
      font-size: 0.9rem;
      margin-bottom: 12px;
      letter-spacing: 2px;
    }
    .testi-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }
    .testi-author {
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .testi-badge {
      font-size: 0.72rem;
      color: var(--brand-success);
      background: rgba(16, 185, 129, 0.1);
      padding: 2px 8px;
      border-radius: 4px;
    }
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .insight-card {
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .insight-img-wrap {
      height: 160px;
      overflow: hidden;
    }
    .insight-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .insight-card:hover .insight-img-wrap img {
      transform: scale(1.06);
    }
    .insight-info {
      padding: 20px 18px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .insight-date {
      font-size: 0.76rem;
      color: var(--text-sub);
      margin-bottom: 8px;
    }
    .insight-title {
      font-size: 0.98rem;
      font-weight: 600;
      color: #fff;
      line-height: 1.45;
      margin-bottom: 10px;
    }
    .insight-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .security-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .security-card {
      padding: 28px 20px;
      text-align: center;
    }
    .security-icon {
      width: 52px;
      height: 52px;
      margin: 0 auto 18px;
      border-radius: 50%;
      background: rgba(14, 165, 233, 0.1);
      border: 1px solid rgba(56, 189, 248, 0.25);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--brand-cyan);
    }
    .security-card h4 {
      font-size: 1.08rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 10px;
    }
    .security-card p {
      font-size: 0.84rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      margin-bottom: 16px;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      overflow: hidden;
      transition: border-color 0.3s ease;
    }
    .faq-item.active {
      border-color: var(--card-border-hover);
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 1.05rem;
      font-weight: 600;
      color: #fff;
      user-select: none;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--brand-cyan);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      padding: 0 24px 20px 24px;
      max-height: 200px;
    }
    .cta-box-wrapper {
      max-width: 960px;
      margin: 0 auto;
      background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
      border: 1px solid rgba(56, 189, 248, 0.3);
      box-shadow: 0 0 50px rgba(14, 165, 233, 0.15);
      border-radius: var(--radius-lg);
      padding: 48px;
    }
    .cta-form {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 32px;
    }
    .cta-form .form-group.full {
      grid-column: 1 / -1;
    }
    .form-input, .form-select {
      width: 100%;
      padding: 14px 18px;
      background: rgba(15, 23, 42, 0.6);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-sm);
      color: #fff;
      font-size: 0.92rem;
      outline: none;
      transition: all 0.3s ease;
    }
    .form-input:focus, .form-select:focus {
      border-color: var(--brand-cyan);
      box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
    }
    .form-select option {
      background: var(--bg-surface);
      color: #fff;
    }
    footer.site-footer {
      background: #070B14;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding: 64px 0 32px;
      font-size: 0.88rem;
      color: var(--text-sub);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand p {
      margin-top: 14px;
      line-height: 1.7;
      color: var(--text-muted);
      font-size: 0.88rem;
    }
    .footer-col h5 {
      color: #fff;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 18px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a:hover {
      color: var(--brand-cyan);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8rem;
    }
    @media (max-width: 1024px) {
      .hero-grid, .overview-grid, .comparison-grid {
        grid-template-columns: 1fr;
      }
      .metrics-grid, .matrix-grid, .programs-grid, .insights-grid, .security-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stories-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-wrap::before {
        left: 20px;
      }
      .timeline-node {
        width: 100%;
        left: 0 !important;
        text-align: left !important;
        padding-left: 50px;
        padding-right: 0;
      }
      .timeline-node .timeline-dot {
        left: 13px !important;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .metrics-grid, .matrix-grid, .programs-grid, .insights-grid, .security-grid, .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 2.1rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .cta-form {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-box-wrapper {
        padding: 30px 20px;
      }
    }