/* roulang page: index */
:root {
      --brand-dark: #0B192C;
      --brand-deep: #070D18;
      --brand-accent: #00FF87;
      --brand-accent-glow: rgba(0, 255, 135, 0.45);
      --brand-coral: #FF5722;
      --bg-light: #F4F7FB;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-white: #FFFFFF;
      --border-color: #E2E8F0;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 8px;
      --shadow-card: 0 12px 32px rgba(11, 25, 44, 0.06);
      --shadow-hover: 0 16px 40px rgba(11, 25, 44, 0.12);
      --transition: all 0.28s ease;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.6;
      overflow-x: hidden;
      padding-bottom: 70px;
    }
    @media (min-width: 1024px) {
      body { padding-bottom: 0; }
    }

    a { color: inherit; text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--brand-accent); }
    img { max-width: 100%; height: auto; display: block; }

    /* Top Utility Bar */
    .top-utility-bar {
      background: var(--brand-deep);
      color: #94A3B8;
      font-size: 0.825rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      display: none;
    }
    @media (min-width: 1024px) {
      .top-utility-bar { display: block; }
    }
    .utility-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .utility-badges span {
      margin-right: 18px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* Main Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(11, 25, 44, 0.94);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 1.28rem;
      color: var(--text-white);
      letter-spacing: -0.5px;
    }
    .brand-logo i {
      color: var(--brand-accent);
      font-size: 1.6rem;
    }
    .desktop-nav {
      display: none;
    }
    @media (min-width: 1024px) {
      .desktop-nav {
        display: flex;
        align-items: center;
        gap: 28px;
      }
      .desktop-nav a {
        color: #CBD5E1;
        font-size: 0.95rem;
        font-weight: 500;
        position: relative;
        padding: 6px 0;
      }
      .desktop-nav a:hover,
      .desktop-nav a.active {
        color: var(--brand-accent);
      }
      .desktop-nav a.active::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 2px;
        background: var(--brand-accent);
        border-radius: 2px;
      }
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    /* Primary Gradient Button */
    .btn-gradient {
      background: linear-gradient(135deg, #00FF87 0%, #00D26A 100%);
      color: var(--brand-dark);
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 50px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 4px 15px rgba(0, 255, 135, 0.35);
      border: none;
      cursor: pointer;
      transition: var(--transition);
      font-size: 0.925rem;
    }
    .btn-gradient:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 255, 135, 0.5);
      color: var(--brand-dark);
    }
    .btn-outline-white {
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: var(--text-white);
      padding: 10px 22px;
      border-radius: 50px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      font-size: 0.925rem;
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(4px);
    }
    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: var(--text-white);
      color: var(--text-white);
    }

    /* Pill Badges */
    .data-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 0.785rem;
      font-weight: 600;
      background: rgba(0, 255, 135, 0.12);
      border: 1px solid rgba(0, 255, 135, 0.4);
      color: #00A859;
      width: fit-content;
    }
    .badge-dark-mode {
      background: rgba(0, 255, 135, 0.15);
      border-color: rgba(0, 255, 135, 0.5);
      color: var(--brand-accent);
    }
    .badge-coral {
      background: rgba(255, 87, 34, 0.12);
      border: 1px solid rgba(255, 87, 34, 0.35);
      color: var(--brand-coral);
    }

    /* Section Foundations */
    .app-section {
      padding: 75px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 45px;
    }
    .section-header.text-center {
      text-align: center;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--brand-dark);
      margin-top: 10px;
      margin-bottom: 14px;
      line-height: 1.25;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto;
    }
    .card-rounded {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-card);
      border: 1px solid rgba(226, 232, 240, 0.8);
      transition: var(--transition);
      height: 100%;
      position: relative;
    }
    .card-rounded:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    /* Hero Banner: Blueprint Quiz / Diagnostic Flow */
    .hero-banner {
      background: linear-gradient(170deg, var(--brand-dark) 0%, #0B192C 60%, #132742 100%);
      color: var(--text-white);
      padding: 60px 0 85px 0;
      position: relative;
      overflow: hidden;
    }
    .hero-banner::before {
      content: '';
      position: absolute;
      top: -30%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0, 255, 135, 0.12) 0%, transparent 70%);
      pointer-events: none;
    }
    .hero-title {
      font-size: 2.6rem;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(120deg, #FFFFFF 30%, var(--brand-accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.08rem;
      color: #94A3B8;
      line-height: 1.7;
      margin-bottom: 28px;
    }
    .diagnostic-panel {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 30px;
      backdrop-filter: blur(16px);
      box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
    }
    .diagnostic-step-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .quiz-options-group {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      margin-bottom: 20px;
    }
    .quiz-opt-btn {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-sm);
      padding: 14px 12px;
      color: #E2E8F0;
      font-size: 0.9rem;
      text-align: center;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
    }
    .quiz-opt-btn i {
      font-size: 1.25rem;
      color: var(--brand-accent);
    }
    .quiz-opt-btn.active, .quiz-opt-btn:hover {
      background: rgba(0, 255, 135, 0.18);
      border-color: var(--brand-accent);
      color: #FFFFFF;
      font-weight: 600;
    }
    .diagnostic-preview-box {
      background: rgba(7, 13, 24, 0.7);
      border-radius: var(--radius-md);
      padding: 16px;
      border: 1px dashed rgba(0, 255, 135, 0.35);
      margin-bottom: 20px;
    }
    .preview-metric-row {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      color: #94A3B8;
      margin-bottom: 6px;
    }
    .preview-metric-row span:last-child {
      color: var(--brand-accent);
      font-weight: 700;
    }

    /* Pain Points Section */
    .pain-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 28px;
      border-left: 5px solid var(--brand-coral);
      box-shadow: var(--shadow-card);
      height: 100%;
    }
    .pain-card h4 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--brand-dark);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .pain-card p {
      font-size: 0.925rem;
      color: var(--text-muted);
      margin-bottom: 0;
    }

    /* Solution Deep-Dive Grid */
    .solution-item {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-color);
      height: 100%;
      position: relative;
    }
    .solution-icon-wrap {
      width: 56px;
      height: 56px;
      background: rgba(0, 255, 135, 0.15);
      color: #00A859;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
    }
    .solution-item h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--brand-dark);
      margin-bottom: 12px;
    }
    .solution-item p {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Hardware & Engine Matrix */
    .hardware-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-color);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .hardware-img-wrap {
      height: 220px;
      overflow: hidden;
      position: relative;
    }
    .hardware-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .hardware-card:hover .hardware-img-wrap img {
      transform: scale(1.05);
    }
    .hardware-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .hardware-body h4 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .spec-table-list {
      list-style: none;
      margin: 16px 0 0 0;
      padding: 0;
      font-size: 0.875rem;
      color: var(--text-muted);
    }
    .spec-table-list li {
      padding: 6px 0;
      border-bottom: 1px solid #F1F5F9;
      display: flex;
      justify-content: space-between;
    }
    .spec-table-list li span:last-child {
      font-weight: 600;
      color: var(--brand-dark);
    }

    /* Dark Mode Analytics Section */
    .dark-analytics-section {
      background-color: var(--brand-deep);
      color: var(--text-white);
      padding: 85px 0;
      position: relative;
    }
    .dark-analytics-section .section-title {
      color: var(--text-white);
    }
    .analytics-stage-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 28px;
      position: relative;
      height: 100%;
    }
    .analytics-stage-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 28px;
      right: 28px;
      height: 2px;
      background: linear-gradient(90deg, var(--brand-accent), transparent);
    }
    .stage-step-tag {
      font-size: 0.8rem;
      color: var(--brand-accent);
      font-family: monospace;
      font-weight: 700;
      margin-bottom: 8px;
      display: block;
    }

    /* Outcome Comparison Before/After */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 24px;
    }
    @media (min-width: 768px) {
      .comparison-grid { grid-template-columns: repeat(2, 1fr); }
    }
    .comp-col-bad {
      background: #FFF5F5;
      border: 1px solid #FED7D7;
      border-radius: var(--radius-lg);
      padding: 30px;
    }
    .comp-col-good {
      background: #F0FDF4;
      border: 1px solid #BBF7D0;
      border-radius: var(--radius-lg);
      padding: 30px;
    }
    .comp-list {
      list-style: none;
      margin: 18px 0 0 0;
      padding: 0;
    }
    .comp-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
    }
    .comp-list li i { margin-top: 4px; }

    /* Counter Bar */
    .metric-counter-band {
      background: linear-gradient(135deg, #0B192C 0%, #1E293B 100%);
      color: var(--text-white);
      padding: 50px 0;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      margin: -30px auto 40px auto;
      position: relative;
      z-index: 10;
    }
    .counter-block {
      text-align: center;
      padding: 10px;
    }
    .counter-number {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--brand-accent);
      line-height: 1.1;
      font-family: -apple-system, sans-serif;
    }
    .counter-label {
      font-size: 0.9rem;
      color: #94A3B8;
      margin-top: 6px;
    }

    /* Testimonial Cards */
    .quote-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-color);
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .quote-text {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .quote-author {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .quote-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--brand-dark);
      border: 2px solid var(--brand-accent);
    }

    /* News Digest Cards */
    .digest-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-color);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .digest-thumb {
      height: 190px;
      overflow: hidden;
    }
    .digest-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .digest-content {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    /* Tier Pricing / Suite Matrix */
    .tier-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 34px 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      position: relative;
      height: 100%;
      transition: var(--transition);
    }
    .tier-card.featured {
      border: 2px solid var(--brand-accent);
      transform: translateY(-6px);
      box-shadow: 0 20px 45px rgba(0, 255, 135, 0.15);
    }
    .tier-badge-top {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--brand-accent);
      color: var(--brand-dark);
      font-size: 0.75rem;
      font-weight: 800;
      padding: 3px 12px;
      border-radius: 20px;
      text-transform: uppercase;
    }
    .tier-title {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--brand-dark);
      margin-bottom: 8px;
    }
    .tier-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      min-height: 42px;
    }

    /* Accordion Customization */
    .foundation-accordion {
      background: transparent;
      border: none;
    }
    .foundation-accordion .accordion-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md) !important;
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }
    .foundation-accordion .accordion-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--brand-dark);
      padding: 18px 24px;
      border: none;
      background: #FFFFFF;
    }
    .foundation-accordion .accordion-title:hover {
      background: #F8FAFC;
      color: #00A859;
    }
    .foundation-accordion .accordion-content {
      padding: 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #F1F5F9;
    }

    /* Lead CTA & Booking Form */
    .lead-cta-card {
      background: linear-gradient(135deg, var(--brand-deep) 0%, #0F2038 100%);
      border-radius: var(--radius-lg);
      padding: 45px 35px;
      color: #FFFFFF;
      box-shadow: 0 24px 50px rgba(7, 13, 24, 0.4);
      border: 1px solid rgba(0, 255, 135, 0.2);
    }
    .form-control-custom {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: var(--radius-sm);
      color: #FFFFFF;
      height: 46px;
      padding: 0 14px;
      width: 100%;
      font-size: 0.95rem;
      margin-bottom: 16px;
      transition: var(--transition);
    }
    .form-control-custom:focus {
      outline: none;
      background: rgba(255, 255, 255, 0.14);
      border-color: var(--brand-accent);
      box-shadow: 0 0 10px rgba(0, 255, 135, 0.25);
    }
    select.form-control-custom option {
      background: var(--brand-dark);
      color: #FFFFFF;
    }

    /* Trust & Compliance Wall */
    .trust-badges-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    @media (min-width: 768px) {
      .trust-badges-grid { grid-template-columns: repeat(4, 1fr); }
    }
    .trust-badge-item {
      background: #FFFFFF;
      padding: 20px 16px;
      border-radius: var(--radius-md);
      text-align: center;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
    }
    .trust-badge-item i {
      font-size: 2rem;
      color: #00A859;
      margin-bottom: 10px;
    }
    .trust-badge-item p {
      margin: 0;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--brand-dark);
    }

    /* Footer */
    .site-footer {
      background: var(--brand-deep);
      color: #94A3B8;
      padding: 65px 0 25px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    .footer-brand {
      color: #FFFFFF;
      font-size: 1.3rem;
      font-weight: 800;
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 16px;
    }
    .footer-brand i { color: var(--brand-accent); }
    .footer-links-list {
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list a:hover {
      color: var(--brand-accent);
      padding-left: 4px;
    }
    .footer-bottom-bar {
      margin-top: 45px;
      padding-top: 25px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      font-size: 0.8rem;
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: center;
      text-align: center;
    }
    @media (min-width: 768px) {
      .footer-bottom-bar {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
      }
    }

    /* Mobile Bottom Tab Bar */
    .mobile-tab-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(11, 25, 44, 0.95);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 1000;
      padding-bottom: env(safe-area-inset-bottom);
    }
    @media (min-width: 1024px) {
      .mobile-tab-bar { display: none; }
    }
    .mobile-tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: #94A3B8;
      font-size: 0.72rem;
      gap: 4px;
      flex: 1;
      height: 100%;
    }
    .mobile-tab-item i {
      font-size: 1.15rem;
    }
    .mobile-tab-item.active,
    .mobile-tab-item:active {
      color: var(--brand-accent);
    }