/* roulang page: index */
:root {
      --primary: #10B981;
      --primary-dark: #059669;
      --primary-hover: #047857;
      --volt: #84CC16;
      --cyan: #06B6D4;
      --slate-900: #0F172A;
      --slate-800: #1E293B;
      --slate-700: #334155;
      --slate-600: #475569;
      --slate-100: #F1F5F9;
      --slate-50: #F8FAFC;
      --white: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
      --border-dark: rgba(255, 255, 255, 0.1);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 6px 24px -4px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 14px 36px -6px rgba(15, 23, 42, 0.12);
      --shadow-glow: 0 0 25px rgba(16, 185, 129, 0.25);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--slate-50);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--slate-900);
      font-weight: 700;
      line-height: 1.3;
      margin-top: 0;
    }

    a {
      color: var(--primary-dark);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover { color: var(--primary); }

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

    /* Top Bar */
    .top-status-bar {
      background: var(--slate-100);
      border-bottom: 1px solid var(--border-light);
      font-size: 13px;
      color: var(--slate-600);
      padding: 8px 0;
      z-index: 1001;
      position: relative;
    }
    .status-badge-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      margin-right: 6px;
      box-shadow: 0 0 8px var(--primary);
      animation: pulseDot 2s infinite ease-in-out;
    }
    @keyframes pulseDot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.85); }
    }

    /* Main Navigation */
    .main-nav-wrapper {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(14px);
      box-shadow: 0 2px 15px rgba(15, 23, 42, 0.05);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: var(--transition);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 21px;
      font-weight: 800;
      color: var(--slate-900);
      letter-spacing: -0.5px;
    }
    .brand-logo svg {
      width: 34px;
      height: 34px;
      fill: var(--primary);
    }
    .brand-badge {
      font-size: 11px;
      background: #ECFDF5;
      color: var(--primary-dark);
      padding: 3px 8px;
      border-radius: 20px;
      font-weight: 600;
      border: 1px solid #A7F3D0;
    }
    .nav-links {
      display: flex;
      gap: 22px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 600;
      color: var(--slate-700);
      padding: 6px 4px;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary-dark);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: var(--white) !important;
      font-weight: 700;
      font-size: 15px;
      padding: 11px 24px;
      border-radius: 8px;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: none;
      cursor: pointer;
    }
    .btn-nav-cta:hover {
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
      transform: translateY(-1px);
      color: var(--white);
    }

    /* Section Styles */
    .site-section {
      padding: 90px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 50px;
      text-align: center;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-dark);
      background: #ECFDF5;
      padding: 4px 14px;
      border-radius: 30px;
      text-transform: uppercase;
      letter-spacing: 0.8px;
      margin-bottom: 12px;
      border: 1px solid #A7F3D0;
    }
    .section-title {
      font-size: 34px;
      font-weight: 800;
      color: var(--slate-900);
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 16px;
      color: var(--slate-600);
      max-width: 720px;
      margin: 0 auto;
      line-height: 1.8;
    }

    /* Hero */
    .hero-container {
      background: linear-gradient(180deg, #09101F 0%, #0F172A 100%);
      position: relative;
      padding: 100px 0 120px;
      color: var(--white);
      overflow: hidden;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .hero-bg-cover {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.16;
      mix-blend-mode: luminosity;
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(16, 185, 129, 0.15);
      border: 1px solid rgba(16, 185, 129, 0.35);
      color: #6EE7B7;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-heading {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--white);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-heading span {
      background: linear-gradient(90deg, #34D399 0%, #06B6D4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-intro {
      font-size: 18px;
      line-height: 1.85;
      color: #CBD5E1;
      margin-bottom: 36px;
      max-width: 680px;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 45px;
    }
    .btn-primary-hero {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: var(--white);
      font-size: 16px;
      font-weight: 700;
      padding: 14px 34px;
      border-radius: 8px;
      box-shadow: 0 6px 24px rgba(16, 185, 129, 0.4);
      border: none;
      cursor: pointer;
    }
    .btn-primary-hero:hover {
      box-shadow: 0 8px 30px rgba(16, 185, 129, 0.6);
      transform: translateY(-2px);
      color: var(--white);
    }
    .btn-secondary-hero {
      background: rgba(255, 255, 255, 0.08);
      color: var(--white);
      border: 1px solid rgba(255, 255, 255, 0.2);
      font-size: 16px;
      font-weight: 600;
      padding: 14px 28px;
      border-radius: 8px;
      backdrop-filter: blur(8px);
    }
    .btn-secondary-hero:hover {
      background: rgba(255, 255, 255, 0.15);
      color: var(--white);
      border-color: rgba(255, 255, 255, 0.35);
    }
    .hero-metrics-pill-box {
      display: flex;
      gap: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
    }
    .hero-metric-item strong {
      display: block;
      font-size: 24px;
      font-weight: 800;
      color: #34D399;
    }
    .hero-metric-item span {
      font-size: 13px;
      color: #94A3B8;
    }
    .hero-card-preview {
      background: rgba(30, 41, 59, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow-lg), var(--shadow-glow);
      backdrop-filter: blur(12px);
    }
    .preview-window-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-bottom: 12px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      margin-bottom: 14px;
    }
    .window-dots {
      display: flex;
      gap: 6px;
    }
    .dot-circle {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .dot-red { background: #EF4444; }
    .dot-yellow { background: #F59E0B; }
    .dot-green { background: #10B981; }
    .preview-timecode {
      font-family: monospace;
      font-size: 13px;
      color: #38BDF8;
      background: rgba(56, 189, 248, 0.12);
      padding: 2px 8px;
      border-radius: 4px;
    }
    .hero-stage-img {
      border-radius: var(--radius-md);
      overflow: hidden;
      position: relative;
    }
    .stage-overlay-tag {
      position: absolute;
      top: 14px;
      left: 14px;
      background: rgba(15, 23, 42, 0.8);
      backdrop-filter: blur(8px);
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 12px;
      color: #34D399;
      font-weight: 700;
      border: 1px solid rgba(52, 211, 153, 0.3);
    }

    /* Cards & Layouts */
    .custom-card {
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #ECFDF5;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary);
    }
    .card-icon svg { width: 24px; height: 24px; fill: currentColor; }
    .custom-card h4 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .custom-card p {
      font-size: 14.5px;
      color: var(--slate-600);
      line-height: 1.7;
      margin-bottom: 0;
    }

    /* Architecture Section */
    .arch-specs-box {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .spec-item-row {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      margin-bottom: 22px;
    }
    .spec-item-row:last-child { margin-bottom: 0; }
    .spec-item-badge {
      font-size: 12px;
      font-weight: 700;
      background: #EFF6FF;
      color: #2563EB;
      padding: 4px 10px;
      border-radius: 6px;
      white-space: nowrap;
      margin-top: 2px;
    }

    /* Dark Workflow Timeline Section */
    .dark-section {
      background: var(--slate-900);
      color: var(--white);
      position: relative;
    }
    .dark-section .section-title { color: var(--white); }
    .dark-section .section-desc { color: #94A3B8; }
    .workflow-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
      margin-top: 30px;
    }
    .workflow-step-card {
      background: var(--slate-800);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      transition: var(--transition);
    }
    .workflow-step-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    }
    .step-number {
      font-size: 12px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: 1px;
      margin-bottom: 10px;
      display: block;
      text-transform: uppercase;
    }
    .workflow-step-card h4 {
      color: var(--white);
      font-size: 17px;
      margin-bottom: 10px;
    }
    .workflow-step-card p {
      color: #94A3B8;
      font-size: 13.5px;
      line-height: 1.65;
      margin: 0;
    }

    /* Matrix Tier Pricing Cards */
    .matrix-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 34px 28px;
      box-shadow: var(--shadow-sm);
      position: relative;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
    }
    .matrix-card.featured-card {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-md), 0 0 20px rgba(16, 185, 129, 0.12);
    }
    .featured-label {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: var(--white);
      font-size: 12px;
      font-weight: 800;
      padding: 4px 16px;
      border-radius: 20px;
      letter-spacing: 0.5px;
    }
    .matrix-title {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .matrix-desc {
      font-size: 14px;
      color: var(--slate-600);
      margin-bottom: 24px;
    }
    .matrix-feature-list {
      list-style: none;
      padding: 0;
      margin: 0 0 28px 0;
    }
    .matrix-feature-list li {
      font-size: 14px;
      color: var(--slate-700);
      padding: 8px 0;
      border-bottom: 1px dashed var(--border-light);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .matrix-feature-list li svg {
      width: 16px;
      height: 16px;
      fill: var(--primary);
      flex-shrink: 0;
    }

    /* Metrics Bar */
    .metrics-bar-section {
      background: linear-gradient(135deg, #059669 0%, #047857 100%);
      color: var(--white);
      padding: 60px 0;
      position: relative;
    }
    .metric-cell {
      text-align: center;
      padding: 10px 16px;
    }
    .metric-big-num {
      font-size: 44px;
      font-weight: 900;
      line-height: 1;
      margin-bottom: 8px;
      color: var(--white);
      font-feature-settings: "tnum";
    }
    .metric-sub-label {
      font-size: 14.5px;
      color: #D1FAE5;
      font-weight: 500;
    }

    /* Case Studies */
    .case-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      overflow: hidden;
      margin-bottom: 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .case-img-wrap {
      height: 240px;
      overflow: hidden;
      position: relative;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }
    .case-body {
      padding: 26px;
    }
    .case-tag {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary-dark);
      background: #ECFDF5;
      padding: 3px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .case-body h4 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .case-body p {
      font-size: 14px;
      color: var(--slate-600);
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .case-stat-badge {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--slate-50);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 600;
      color: var(--slate-700);
    }

    /* Testimonials */
    .testimonial-card {
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .quote-text {
      font-size: 14.5px;
      line-height: 1.75;
      color: var(--slate-700);
      margin-bottom: 20px;
      font-style: normal;
    }
    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar-initial {
      width: 42px;
      height: 42px;
      background: #D1FAE5;
      color: var(--primary-dark);
      font-weight: 800;
      font-size: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
    }
    .user-meta h5 {
      font-size: 15px;
      font-weight: 700;
      margin: 0;
      color: var(--slate-900);
    }
    .user-meta span {
      font-size: 12px;
      color: var(--slate-600);
    }

    /* News Brief */
    .news-item-card {
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .news-item-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
    }
    .news-date {
      font-size: 12px;
      color: var(--slate-600);
      margin-bottom: 8px;
    }
    .news-item-card h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-item-card p {
      font-size: 13.5px;
      color: var(--slate-600);
      margin-bottom: 14px;
      line-height: 1.6;
    }

    /* Partners Logo Wall */
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
      align-items: center;
    }
    .partner-logo-item {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 16px;
      text-align: center;
      font-size: 14px;
      font-weight: 700;
      color: var(--slate-600);
      transition: var(--transition);
    }
    .partner-logo-item:hover {
      border-color: var(--primary);
      color: var(--primary-dark);
      background: #F0FDF4;
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
    }
    .accordion-item {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md) !important;
      margin-bottom: 14px;
      overflow: hidden;
    }
    .accordion-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--slate-900);
      padding: 20px 24px;
      background: var(--white);
      border: none;
      transition: var(--transition);
    }
    .accordion-title:hover, .accordion-title:focus {
      background: var(--slate-50);
      color: var(--primary-dark);
    }
    .accordion-content {
      padding: 20px 24px;
      border-top: 1px solid var(--slate-100);
      font-size: 14.5px;
      color: var(--slate-600);
      line-height: 1.8;
      background: var(--white);
    }

    /* Guarantee Strip */
    .guarantee-bar {
      background: #FFFFFF;
      border: 1px solid #A7F3D0;
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: 0 4px 20px rgba(16, 185, 129, 0.06);
    }
    .guarantee-item {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .guarantee-icon {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ECFDF5;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      flex-shrink: 0;
    }
    .guarantee-icon svg { width: 22px; height: 22px; fill: currentColor; }
    .guarantee-text h5 {
      font-size: 15px;
      font-weight: 700;
      margin: 0 0 2px 0;
    }
    .guarantee-text p {
      font-size: 12.5px;
      color: var(--slate-600);
      margin: 0;
    }

    /* Contact CTA Section */
    .cta-section {
      background: linear-gradient(145deg, #064E3B 0%, #022C22 100%);
      color: var(--white);
      padding: 85px 0;
      position: relative;
    }
    .cta-form-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-lg);
      color: var(--slate-900);
    }
    .cta-form-card h3 {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .cta-form-card p {
      font-size: 14px;
      color: var(--slate-600);
      margin-bottom: 22px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      font-size: 13.5px;
      font-weight: 600;
      color: var(--slate-700);
      margin-bottom: 6px;
      display: block;
    }
    .form-control {
      width: 100%;
      height: 44px;
      padding: 8px 14px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: var(--slate-50);
      transition: var(--transition);
      margin-bottom: 0;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: var(--white);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }
    .btn-submit-cta {
      width: 100%;
      height: 48px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: var(--white);
      font-size: 16px;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 16px rgba(16, 185, 129, 0.35);
      transition: var(--transition);
      margin-top: 10px;
    }
    .btn-submit-cta:hover {
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.55);
      transform: translateY(-1px);
    }

    /* Footer */
    .site-footer {
      background: #09101F;
      color: #94A3B8;
      padding: 70px 0 30px;
      font-size: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-col h5 {
      color: var(--white);
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94A3B8;
      transition: var(--transition);
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin-top: 50px;
      padding-top: 25px;
      text-align: center;
      font-size: 13px;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .workflow-timeline { grid-template-columns: repeat(2, 1fr); }
      .partner-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 768px) {
      .hero-heading { font-size: 32px; }
      .section-title { font-size: 26px; }
      .nav-links { display: none; }
      .workflow-timeline { grid-template-columns: 1fr; }
      .partner-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics-pill-box { flex-direction: column; gap: 12px; }
    }