/* roulang page: index */
:root {
      --bg-dark: #070A13;
      --bg-surface: #0A0F1D;
      --bg-card: rgba(13, 21, 39, 0.72);
      --bg-glass-hover: rgba(22, 35, 64, 0.82);
      --primary-blue: #165DFF;
      --primary-glow: #00F2FE;
      --cyan-bright: #00C5FF;
      --text-main: #FFFFFF;
      --text-secondary: #94A3B8;
      --text-muted: #64748B;
      --border-glow: rgba(0, 197, 255, 0.18);
      --border-strong: rgba(0, 242, 254, 0.4);
      --box-glow: 0 0 24px rgba(0, 197, 255, 0.35);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      -webkit-font-smoothing: antialiased;
    }
    body {
      line-height: 1.6;
      background-color: var(--bg-dark);
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    ul, ol {
      list-style: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .top-statusbar {
      background: rgba(7, 10, 19, 0.95);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 13px;
      color: var(--text-muted);
      padding: 8px 0;
    }
    .top-statusbar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .status-tags {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--cyan-bright);
    }
    .status-badge::before {
      content: "";
      width: 6px;
      height: 6px;
      background: var(--cyan-bright);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--cyan-bright);
    }
    .status-contacts {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 15, 29, 0.85);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--border-glow);
    }
    .header-nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 76px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 22px;
      font-weight: 800;
      letter-spacing: 0.5px;
      color: var(--text-main);
    }
    .chip-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--primary-blue), var(--cyan-bright));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 16px rgba(0, 197, 255, 0.5);
      font-weight: 900;
      font-size: 16px;
      color: #fff;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--text-main);
    }
    .nav-links a.active::after, .nav-links a:hover::after {
      content: "";
      position: absolute;
      bottom: -6px;
      left: 0;
      right: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--primary-blue), var(--cyan-bright));
      border-radius: 2px;
    }
    .btn-glow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 24px;
      background: linear-gradient(135deg, #165DFF 0%, #00C5FF 100%);
      color: #fff;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      box-shadow: 0 0 20px rgba(0, 197, 255, 0.45);
      border: 1px solid rgba(255, 255, 255, 0.2);
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .btn-glow:hover {
      box-shadow: 0 0 28px rgba(0, 242, 254, 0.7);
      transform: translateY(-2px);
      color: #fff;
    }
    .btn-ghost {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 24px;
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-main);
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-glow);
      backdrop-filter: blur(8px);
      transition: var(--transition-smooth);
    }
    .btn-ghost:hover {
      background: rgba(0, 197, 255, 0.15);
      border-color: var(--cyan-bright);
      transform: translateY(-2px);
    }
    section {
      padding: 96px 0;
      position: relative;
    }
    .section-alt {
      background: linear-gradient(180deg, rgba(10, 15, 29, 0.4) 0%, rgba(13, 21, 39, 0.8) 50%, rgba(10, 15, 29, 0.4) 100%);
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }
    .section-dark {
      background-color: var(--bg-dark);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--cyan-bright);
      padding: 4px 12px;
      border-radius: 20px;
      background: rgba(0, 197, 255, 0.1);
      border: 1px solid rgba(0, 197, 255, 0.25);
      margin-bottom: 14px;
      font-weight: 600;
    }
    .section-title {
      font-size: 34px;
      font-weight: 700;
      line-height: 1.35;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 820px;
      line-height: 1.7;
    }
    .hero-banner-strip {
      background: linear-gradient(180deg, #0D1527 0%, #070A13 100%);
      padding: 40px 0 60px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-glow);
    }
    .hero-backdrop {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      opacity: 0.18;
      object-fit: cover;
      pointer-events: none;
    }
    .hero-strip-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-main-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #FFFFFF 40%, #00F2FE 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 16px;
      color: var(--text-secondary);
      line-height: 1.8;
      margin-bottom: 30px;
    }
    .hero-btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-strip-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition-smooth);
      position: relative;
    }
    .glass-card:hover {
      background: var(--bg-glass-hover);
      border-color: var(--border-strong);
      transform: translateY(-4px);
      box-shadow: var(--box-glow);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .tier-header {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      margin-bottom: 14px;
    }
    .tier-label {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
    }
    .tier-stat {
      color: var(--cyan-bright);
      font-weight: 600;
      font-size: 14px;
    }
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 16px;
      font-size: 14px;
    }
    .spec-table th, .spec-table td {
      padding: 12px 14px;
      text-align: left;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .spec-table th {
      background: rgba(0, 197, 255, 0.08);
      color: var(--cyan-bright);
      font-weight: 600;
    }
    .spec-table td {
      color: var(--text-secondary);
    }
    .spec-table tr:hover td {
      background: rgba(255, 255, 255, 0.02);
      color: var(--text-main);
    }
    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 18px;
      position: relative;
    }
    .step-item {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: rgba(0, 197, 255, 0.15);
      color: var(--cyan-bright);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 14px;
      border: 1px solid var(--cyan-bright);
    }
    .step-title {
      font-size: 17px;
      font-weight: 600;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .step-desc {
      font-size: 13.5px;
      color: var(--text-secondary);
      line-height: 1.6;
    }
    .stat-number {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 8px;
      background: linear-gradient(135deg, #00F2FE 0%, #165DFF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .stat-desc {
      font-size: 14px;
      color: var(--text-secondary);
    }
    .user-story-card {
      display: flex;
      flex-direction: column;
      gap: 16px;
      height: 100%;
    }
    .user-story-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.06);
    }
    .quote-box {
      border-left: 3px solid var(--cyan-bright);
      padding-left: 14px;
      margin-bottom: 16px;
      font-style: italic;
      color: #CBD5E1;
      font-size: 14.5px;
    }
    .author-meta {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #165DFF, #00C5FF);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-item summary {
      padding: 22px 28px;
      cursor: pointer;
      font-weight: 600;
      font-size: 17px;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: "+";
      font-size: 20px;
      color: var(--cyan-bright);
      transition: transform 0.2s ease;
    }
    .faq-item[open] summary::after {
      content: "−";
    }
    .faq-body {
      padding: 0 28px 24px;
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.7;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 16px;
    }
    .cta-box {
      background: radial-gradient(circle at center, #101c38 0%, #070A13 100%);
      border: 1px solid var(--cyan-bright);
      box-shadow: 0 0 32px rgba(0, 197, 255, 0.25);
      border-radius: var(--radius-lg);
      padding: 56px 40px;
      text-align: center;
    }
    .cta-form {
      display: flex;
      justify-content: center;
      gap: 16px;
      max-width: 620px;
      margin: 32px auto 16px;
      flex-wrap: wrap;
    }
    .cta-input {
      flex: 1;
      min-width: 260px;
      background: rgba(13, 21, 39, 0.85);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-sm);
      padding: 14px 18px;
      color: #fff;
      font-size: 15px;
      outline: none;
    }
    .cta-input:focus {
      border-color: var(--cyan-bright);
      box-shadow: 0 0 12px rgba(0, 197, 255, 0.4);
    }
    .site-footer {
      background: #05070d;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 64px 0 32px;
      font-size: 14px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-title {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--cyan-bright);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .timeline-steps { grid-template-columns: repeat(3, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
      .hero-strip-grid { grid-template-columns: 1fr; }
      .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
      .timeline-steps { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .hero-main-title { font-size: 30px; }
      .section-title { font-size: 26px; }
      .footer-grid { grid-template-columns: 1fr; }
    }