/* roulang page: index */
:root {
      --primary: #0F53FF;
      --primary-hover: #0043E0;
      --accent: #00D084;
      --dark: #0B0F19;
      --dark-card: #151B2B;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --bg-light: #F8FAFC;
      --bg-alt: #F1F5F9;
      --white: #FFFFFF;
      --border: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 12px rgba(15, 83, 255, 0.05);
      --shadow-md: 0 10px 30px -10px rgba(15, 83, 255, 0.12);
      --shadow-lg: 0 20px 40px -15px rgba(15, 15, 25, 0.15);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--white);
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    ul, ol {
      list-style: none;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      min-height: 46px;
      gap: 8px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: var(--white);
      box-shadow: 0 4px 14px rgba(15, 83, 255, 0.3);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(15, 83, 255, 0.4);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--border);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(15, 83, 255, 0.04);
    }
    .btn-accent {
      background-color: var(--accent);
      color: var(--dark);
      font-weight: 700;
    }
    .btn-accent:hover {
      filter: brightness(1.05);
      transform: translateY(-2px);
    }
    .section {
      padding: 100px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-light);
    }
    .section-dark {
      background-color: var(--dark);
      color: var(--white);
    }
    .section-header {
      margin-bottom: 56px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .badge {
      display: inline-block;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 999px;
      background: rgba(15, 83, 255, 0.08);
      color: var(--primary);
      margin-bottom: 16px;
    }
    .badge-accent {
      background: rgba(0, 208, 132, 0.15);
      color: var(--accent);
    }
    .section-title {
      font-size: 34px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
      letter-spacing: -0.02em;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .section-dark .section-desc {
      color: var(--text-light);
    }
    /* Header Topbar & Nav */
    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);
    }
    .topbar {
      background: var(--dark);
      color: var(--text-light);
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .topbar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .topbar-status {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
    }
    .navbar {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
    }
    .logo-symbol {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary) 0%, #3B82F6 100%);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--white);
      font-weight: 900;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    /* Hero - Product Stage Blueprint */
    .hero-section {
      padding: 70px 0 90px;
      background: radial-gradient(100% 50% at 50% 0%, rgba(15, 83, 255, 0.05) 0%, rgba(255, 255, 255, 0) 100%);
      text-align: center;
      overflow: hidden;
    }
    .hero-h1 {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.03em;
      margin-bottom: 22px;
      color: var(--text-main);
      max-width: 960px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-intro {
      font-size: 18px;
      line-height: 1.8;
      color: var(--text-muted);
      max-width: 840px;
      margin: 0 auto 36px;
    }
    .hero-stage-wrapper {
      position: relative;
      margin-top: 48px;
      padding: 16px;
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid var(--border);
      border-radius: 20px;
      box-shadow: 0 30px 60px -20px rgba(15, 83, 255, 0.15);
    }
    .stage-layout {
      display: grid;
      grid-template-columns: 260px 1fr 260px;
      gap: 24px;
      align-items: center;
    }
    .stage-side {
      display: flex;
      flex-direction: column;
      gap: 20px;
      text-align: left;
    }
    .side-pill {
      background: var(--white);
      padding: 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .side-pill:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
    }
    .side-pill h4 {
      font-size: 15px;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .side-pill p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .stage-main-display {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #000;
    }
    .stage-main-display img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .stage-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 24px;
      background: linear-gradient(180deg, transparent 0%, rgba(11, 15, 25, 0.9) 100%);
      color: var(--white);
      text-align: left;
    }
    /* KPI Banner (#kpi) */
    .kpi-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .kpi-card {
      background: var(--white);
      padding: 36px 28px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .kpi-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
    }
    .kpi-number {
      font-size: 44px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 12px;
      font-feature-settings: "tnum";
    }
    .kpi-label {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .kpi-desc {
      font-size: 13px;
      color: var(--text-muted);
    }
    /* Service Matrix (#services) */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .matrix-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .matrix-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .matrix-img {
      height: 200px;
      overflow: hidden;
      background: var(--bg-alt);
    }
    .matrix-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .matrix-card:hover .matrix-img img {
      transform: scale(1.05);
    }
    .matrix-body {
      padding: 28px;
    }
    .matrix-body h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }
    .matrix-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.6;
    }
    /* Results Comparison (#comparison) */
    .compare-table-wrapper {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 20px 28px;
      border-bottom: 1px solid var(--border);
      font-size: 15px;
    }
    .compare-table th {
      background: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }
    .compare-table th.col-highlight, .compare-table td.col-highlight {
      background: rgba(15, 83, 255, 0.03);
      color: var(--primary);
      font-weight: 600;
    }
    /* Milestones (#milestones) */
    .timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .timeline-step {
      background: var(--white);
      border: 1px solid var(--border);
      padding: 30px 24px;
      border-radius: var(--radius-md);
      position: relative;
      transition: var(--transition);
    }
    .timeline-step:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
    }
    .step-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: var(--white);
      font-weight: 700;
      border-radius: 8px;
      margin-bottom: 16px;
    }
    .timeline-step h4 {
      font-size: 17px;
      margin-bottom: 10px;
    }
    .timeline-step p {
      font-size: 13px;
      color: var(--text-muted);
    }
    /* Overview Section (#overview) */
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .overview-media img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
    }
    .cycle-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 24px;
    }
    .cycle-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      padding: 16px;
      background: var(--bg-alt);
      border-radius: var(--radius-md);
    }
    .cycle-index {
      width: 28px;
      height: 28px;
      border-radius: 6px;
      background: var(--primary);
      color: var(--white);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 13px;
      flex-shrink: 0;
    }
    /* Command Dashboard (#dashboard) */
    .dashboard-preview {
      background: var(--dark-card);
      border-radius: var(--radius-lg);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 32px;
      box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
    }
    .dash-topbar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      padding-bottom: 20px;
      margin-bottom: 28px;
    }
    .dash-indicators {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-bottom: 28px;
    }
    .indicator-box {
      background: rgba(255, 255, 255, 0.04);
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .indicator-val {
      font-size: 26px;
      font-weight: 700;
      color: var(--accent);
      margin-top: 6px;
    }
    /* Live Broadcast Previews (#live-stream) */
    .broadcast-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      display: grid;
      grid-template-columns: 1.2fr 1fr;
    }
    .broadcast-video-mock {
      position: relative;
      background: #000;
    }
    .broadcast-video-mock img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.85;
    }
    .live-tag {
      position: absolute;
      top: 20px;
      left: 20px;
      background: #EF4444;
      color: #fff;
      padding: 4px 12px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 1px;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; }
      50% { opacity: 0.6; }
      100% { opacity: 1; }
    }
    .broadcast-content {
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    /* Pricing Tiers (#pricing) */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      align-items: stretch;
    }
    .price-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
    }
    .price-card.featured {
      border-color: var(--primary);
      box-shadow: 0 20px 40px -10px rgba(15, 83, 255, 0.18);
      transform: translateY(-8px);
    }
    .featured-label {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: var(--white);
      padding: 4px 16px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 700;
    }
    .price-val {
      font-size: 38px;
      font-weight: 800;
      color: var(--text-main);
      margin: 16px 0 24px;
    }
    .price-val span {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
    }
    .price-features {
      margin-bottom: 32px;
      flex-grow: 1;
    }
    .price-features li {
      font-size: 14px;
      color: var(--text-muted);
      padding: 10px 0;
      border-bottom: 1px dashed var(--border);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .price-features li::before {
      content: "✓";
      color: var(--accent);
      font-weight: 800;
    }
    /* Testimonials (#testimonials) */
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .testi-stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .testi-quote {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .testi-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--bg-alt);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    /* News Section (#news) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      overflow: hidden;
      transition: var(--transition);
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .news-card img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 24px;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 8px;
    }
    .news-body h4 {
      font-size: 17px;
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* Security & Compliance (#security) */
    .security-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .sec-item {
      background: var(--bg-alt);
      padding: 24px;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--primary);
    }
    .sec-item h4 {
      font-size: 16px;
      margin-bottom: 6px;
    }
    .sec-item p {
      font-size: 13px;
      color: var(--text-muted);
    }
    /* FAQ Section (#faq) */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    details.faq-item {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }
    details.faq-item[open] {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    summary.faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    summary.faq-question::-webkit-details-marker {
      display: none;
    }
    summary.faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--text-muted);
      transition: transform 0.2s ease;
    }
    details[open] summary.faq-question::after {
      content: "−";
      color: var(--primary);
    }
    .faq-answer {
      padding: 0 24px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
      border-top: 1px solid var(--bg-alt);
      padding-top: 16px;
    }
    /* CTA Form (#contact) */
    .cta-card {
      background: linear-gradient(135deg, var(--dark) 0%, #162038 100%);
      border-radius: var(--radius-lg);
      padding: 64px 48px;
      color: var(--white);
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .cta-inner {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .cta-info h2 {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .cta-info p {
      color: var(--text-light);
      font-size: 15px;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .cta-features-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .cta-features-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: var(--white);
    }
    .cta-features-list li::before {
      content: "●";
      color: var(--accent);
      font-size: 10px;
    }
    .cta-form {
      background: rgba(255, 255, 255, 0.05);
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.12);
      backdrop-filter: blur(8px);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-light);
    }
    .form-control {
      width: 100%;
      height: 44px;
      padding: 0 16px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.08);
      color: var(--white);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      background: rgba(255, 255, 255, 0.12);
    }
    .form-control option {
      background: var(--dark);
      color: var(--white);
    }
    /* Footer */
    footer {
      background: var(--dark);
      color: var(--text-light);
      padding-top: 80px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 60px;
    }
    .footer-brand h3 {
      color: var(--white);
      font-size: 20px;
      margin-bottom: 16px;
      font-weight: 800;
    }
    .footer-brand p {
      line-height: 1.8;
      margin-bottom: 20px;
    }
    .footer-col h4 {
      color: var(--white);
      font-size: 16px;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links a:hover {
      color: var(--white);
    }
    .footer-contact li {
      margin-bottom: 12px;
      line-height: 1.6;
    }
    .footer-bottom {
      padding: 24px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }
    .footer-bottom a {
      color: var(--text-light);
    }
    .footer-bottom a:hover {
      color: var(--white);
    }
    /* Mobile Responsive */
    @media (max-width: 1024px) {
      .kpi-grid, .timeline, .security-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .matrix-grid, .pricing-grid, .testi-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-h1 {
        font-size: 36px;
      }
      .stage-layout {
        grid-template-columns: 1fr;
      }
      .stage-side {
        display: grid;
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .overview-grid, .broadcast-card, .cta-inner {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .section {
        padding: 60px 0;
      }
      .hero-h1 {
        font-size: 28px;
      }
      .stage-side {
        grid-template-columns: 1fr;
      }
      .kpi-grid, .matrix-grid, .pricing-grid, .testi-grid, .news-grid, .timeline, .security-bar, .dash-indicators {
        grid-template-columns: 1fr;
      }
      .cta-card {
        padding: 36px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .topbar {
        display: none;
      }
    }