/* roulang page: index */
:root {
      --primary: #0F172A;
      --primary-hover: #1E293B;
      --accent: #2563EB;
      --accent-hover: #1D4ED8;
      --accent-light: rgba(37, 99, 235, 0.08);
      --success: #10B981;
      --bg-base: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-dark: #090D16;
      --bg-alt: #F1F5F9;
      --text-title: #0A0F1D;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: rgba(15, 23, 42, 0.08);
      --border-dark: rgba(255, 255, 255, 0.12);
      --radius-sm: 4px;
      --radius-base: 8px;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 12px 24px -6px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.1);
      --container-max: 1240px;
      --transition: 250ms cubic-bezier(0.16, 1, 0.3, 1);
      --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

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

    body {
      font-family: var(--font-family);
      background-color: var(--bg-base);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* Top Bar */
    .top-bar {
      height: 40px;
      background: var(--primary);
      color: #94A3B8;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      align-items: center;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .badge-status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #E2E8F0;
    }
    .badge-dot {
      width: 7px;
      height: 7px;
      background: var(--success);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--success);
    }
    .top-bar-contact {
      display: flex;
      gap: 20px;
    }

    /* Header Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-icon {
      width: 32px;
      height: 32px;
      background: var(--accent);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 16px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: var(--transition);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background: var(--accent);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
    }
    .btn-outline {
      border-color: var(--border-color);
      background: var(--bg-card);
      color: var(--primary);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background: #F8FAFC;
    }
    .btn-dark {
      background: #1E293B;
      color: #FFFFFF;
      border-color: rgba(255, 255, 255, 0.15);
    }
    .btn-dark:hover {
      background: #334155;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--primary);
    }

    /* Section Global */
    section {
      padding: 90px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 56px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 600;
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 1px;
      background: var(--accent-light);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 14px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-title);
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 1. Hero Section */
    .hero-section {
      padding: 80px 0 100px;
      background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.05) 0%, transparent 60%),
                  linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 44px;
      font-weight: 800;
      color: var(--text-title);
      line-height: 1.18;
      letter-spacing: -0.8px;
      margin-bottom: 24px;
    }
    .hero-content h1 span {
      color: var(--accent);
    }
    .hero-lead {
      font-size: 17px;
      color: var(--text-body);
      margin-bottom: 32px;
      line-height: 1.8;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .hero-perks {
      display: flex;
      gap: 24px;
      font-size: 13px;
      color: var(--text-muted);
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }
    .hero-perks span {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    /* Coupon / Access Ticket Wall */
    .coupon-ticket-box {
      background: #FFFFFF;
      border: 1px dashed rgba(37, 99, 235, 0.4);
      border-radius: var(--radius-base);
      padding: 28px;
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .coupon-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 16px;
      margin-bottom: 20px;
    }
    .coupon-tag-pro {
      background: #EFF6FF;
      color: var(--accent);
      font-size: 12px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 2px;
    }
    .coupon-amount {
      font-size: 34px;
      font-weight: 700;
      color: var(--text-title);
      font-variant-numeric: tabular-nums;
      margin-bottom: 8px;
    }
    .coupon-amount small {
      font-size: 14px;
      font-weight: 400;
      color: var(--text-muted);
    }
    .coupon-features-list {
      list-style: none;
      font-size: 13px;
      color: var(--text-body);
      margin-bottom: 24px;
    }
    .coupon-features-list li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* 2. Intro Section */
    .section-intro {
      background: #FFFFFF;
    }
    .intro-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 56px;
      align-items: center;
    }
    .intro-meta-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #F8FAFC;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 4px;
      font-size: 13px;
      color: var(--text-title);
      margin-bottom: 20px;
      font-weight: 600;
    }
    .intro-text h2 {
      font-size: 30px;
      font-weight: 700;
      color: var(--text-title);
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .intro-text p {
      font-size: 15px;
      color: var(--text-body);
      margin-bottom: 16px;
      line-height: 1.8;
    }
    .benchmark-highlight {
      margin-top: 24px;
      padding: 16px 20px;
      background: #F0FDF4;
      border-left: 4px solid var(--success);
      font-size: 14px;
      color: #166534;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }
    .intro-media-card {
      position: relative;
      border-radius: var(--radius-base);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .intro-media-card img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }

    /* 3. Advantages Grid */
    .section-advantages {
      background: var(--bg-base);
    }
    .grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card-adv {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      padding: 32px 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card-adv:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(37, 99, 235, 0.3);
    }
    .adv-icon-num {
      font-size: 14px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 16px;
      background: var(--accent-light);
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
    }
    .card-adv h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 12px;
    }
    .card-adv p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 4. Products */
    .section-products {
      background: #FFFFFF;
    }
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      padding: 36px 28px;
      background: #FFFFFF;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
    }
    .product-card.featured {
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
    }
    .product-card.featured::before {
      content: '推荐交付';
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--accent);
      color: #FFF;
      font-size: 11px;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: 20px;
    }
    .product-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 8px;
    }
    .product-type {
      font-size: 13px;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 20px;
    }
    .product-spec-list {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
    }
    .product-spec-list li {
      font-size: 14px;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 1px solid #F1F5F9;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* 5. Dark Architecture */
    .section-dark {
      background: var(--bg-dark);
      color: #E2E8F0;
      border-top: 1px solid #1E293B;
      border-bottom: 1px solid #1E293B;
    }
    .section-dark .section-title {
      color: #F8FAFC;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }
    .dark-flow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .dark-node-card {
      background: #131A29;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-base);
      padding: 28px 20px;
      position: relative;
    }
    .dark-node-step {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    .dark-node-card h4 {
      font-size: 17px;
      font-weight: 600;
      color: #F8FAFC;
      margin-bottom: 10px;
    }
    .dark-node-card p {
      font-size: 13px;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* 6. Workflows */
    .section-workflows {
      background: var(--bg-base);
    }
    .steps-horizontal {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .step-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      padding: 28px 24px;
      position: relative;
    }
    .step-badge {
      font-size: 20px;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 14px;
    }
    .step-item h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 10px;
    }
    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 7. Stories / Cases */
    .section-stories {
      background: #FFFFFF;
    }
    .story-card-complex {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-base);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      overflow: hidden;
      margin-bottom: 32px;
      align-items: center;
    }
    .story-card-complex:last-child {
      margin-bottom: 0;
    }
    .story-img-box img {
      width: 100%;
      height: 340px;
      object-fit: cover;
    }
    .story-detail {
      padding: 36px 36px 36px 0;
    }
    .story-detail h3 {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 14px;
    }
    .story-detail p {
      font-size: 14px;
      color: var(--text-body);
      margin-bottom: 20px;
      line-height: 1.75;
    }
    .metric-row {
      display: flex;
      gap: 32px;
      border-top: 1px solid var(--border-color);
      padding-top: 18px;
    }
    .metric-item-num {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
    }
    .metric-item-label {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 8. Metrics Bar */
    .section-metrics {
      background: var(--primary);
      padding: 60px 0;
      color: #FFFFFF;
    }
    .metrics-bar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metrics-val {
      font-size: 42px;
      font-weight: 800;
      color: #FFFFFF;
      font-variant-numeric: tabular-nums;
      margin-bottom: 6px;
    }
    .metrics-label {
      font-size: 14px;
      color: #94A3B8;
      font-weight: 500;
    }

    /* 9. Testimonials */
    .section-testimonials {
      background: var(--bg-base);
    }
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      padding: 32px 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-quote {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.8;
      margin-bottom: 24px;
      font-style: italic;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid #F1F5F9;
      padding-top: 18px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--accent-light);
      color: var(--accent);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }
    .author-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-title);
    }
    .author-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 10. News & Tech Digest */
    .section-news {
      background: #FFFFFF;
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      background: #FFFFFF;
    }
    .news-card img {
      width: 100%;
      height: 190px;
      object-fit: cover;
    }
    .news-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 10px;
    }
    .news-tag {
      color: var(--accent);
      font-weight: 600;
    }
    .news-body h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--accent);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 11. Partners Ecosystem */
    .section-partners {
      background: var(--bg-base);
      padding: 60px 0;
    }
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
      margin-top: 32px;
    }
    .partner-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 600;
      color: #64748B;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    /* 12. FAQ Accordion */
    .section-faq {
      background: #FFFFFF;
    }
    .faq-container-narrow {
      max-width: 840px;
      margin: 0 auto;
    }
    .faq-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-toggle {
      width: 100%;
      text-align: left;
      background: #FFFFFF;
      border: none;
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-title);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-toggle:hover {
      background: #F8FAFC;
    }
    .faq-icon {
      font-size: 18px;
      font-weight: 400;
      color: var(--text-muted);
      transition: transform 0.25s ease;
    }
    .faq-content {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
      background: #F8FAFC;
    }
    .faq-item.active .faq-content {
      padding: 16px 24px 24px;
      max-height: 250px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-content p {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.75;
    }

    /* 13. High Conversion CTA */
    .section-cta {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: #FFFFFF;
      padding: 80px 0;
    }
    .cta-box-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
    }
    .cta-text h2 {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #F8FAFC;
    }
    .cta-text p {
      font-size: 15px;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .cta-form-card {
      background: #FFFFFF;
      border-radius: var(--radius-base);
      padding: 32px;
      color: var(--text-title);
    }
    .cta-form-card h4 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-title);
    }
    .form-group {
      margin-bottom: 14px;
    }
    .form-input {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

    /* Footer */
    .site-footer {
      background: #090D16;
      color: #64748B;
      font-size: 13px;
      padding: 70px 0 30px;
      border-top: 1px solid #1E293B;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand h4 {
      font-size: 18px;
      font-weight: 700;
      color: #F8FAFC;
      margin-bottom: 14px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .footer-col h5 {
      font-size: 14px;
      font-weight: 600;
      color: #F8FAFC;
      margin-bottom: 16px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul a:hover {
      color: #94A3B8;
    }
    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .compliance-links a {
      margin-right: 16px;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-grid, .intro-grid, .story-card-complex, .cta-box-grid {
        grid-template-columns: 1fr;
      }
      .grid-6, .product-grid, .dark-flow-grid, .steps-horizontal, .testimonials-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .partner-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .story-detail {
        padding: 0 28px 28px;
      }
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .top-bar-contact {
        display: none;
      }
      .nav-links, .nav-actions .btn {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .grid-6, .product-grid, .dark-flow-grid, .steps-horizontal, .metrics-bar-grid, .testimonials-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .partner-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }