/* roulang page: index */
:root {
      --bg-dark: #070b19;
      --bg-gradient-start: #070b19;
      --bg-gradient-end: #0b132b;
      --card-bg: rgba(16, 26, 60, 0.65);
      --card-border: rgba(0, 242, 254, 0.18);
      --card-hover-border: rgba(0, 242, 254, 0.55);
      --primary-cyan: #00f2fe;
      --primary-cyan-end: #4facfe;
      --accent-violet: #6a11cb;
      --accent-violet-end: #2575fc;
      --text-main: #f0f4fc;
      --text-muted: #8ea0c7;
      --text-dim: #5c6e94;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      --glow-cyan: 0 0 20px rgba(0, 242, 254, 0.35);
      --glow-strong: 0 0 32px rgba(0, 242, 254, 0.65);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      padding: 0;
      font-family: var(--font-family);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-main);
      background: linear-gradient(180deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
      min-height: 100vh;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a { color: var(--primary-cyan); text-decoration: none; transition: var(--transition); }
    a:hover, a:focus { color: #ffffff; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
    .top-bar-info {
      background: rgba(4, 7, 18, 0.95);
      border-bottom: 1px solid rgba(0, 242, 254, 0.1);
      padding: 7px 0;
      font-size: 13px;
      color: var(--text-muted);
    }
    .top-bar-info .grid-x { align-items: center; justify-content: space-between; }
    .top-info-item { display: inline-flex; align-items: center; margin-right: 20px; }
    .top-info-item i { margin-right: 6px; color: var(--primary-cyan); }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 18, 44, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 242, 254, 0.15);
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
    }
    .nav-container { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
    .brand-logo { display: flex; align-items: center; font-size: 20px; font-weight: 700; color: #ffffff; letter-spacing: 0.5px; }
    .brand-logo i {
      font-size: 24px;
      margin-right: 10px;
      background: linear-gradient(135deg, var(--primary-cyan), var(--accent-violet));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .brand-logo span.highlight {
      background: linear-gradient(135deg, var(--primary-cyan), #ffffff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .brand-badge {
      display: inline-block;
      font-size: 11px;
      padding: 2px 7px;
      margin-left: 8px;
      border-radius: 4px;
      background: rgba(0, 242, 254, 0.12);
      border: 1px solid rgba(0, 242, 254, 0.3);
      color: var(--primary-cyan);
    }
    .nav-links { display: flex; list-style: none; margin: 0; padding: 0; gap: 20px; }
    .nav-links li a {
      color: var(--text-muted);
      font-size: 15px;
      font-weight: 500;
      padding: 6px 4px;
      position: relative;
    }
    .nav-links li a:hover, .nav-links li a.active { color: var(--primary-cyan); }
    .nav-links li a::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-cyan);
      transition: width 0.3s ease;
      box-shadow: 0 0 8px var(--primary-cyan);
    }
    .nav-links li a:hover::after, .nav-links li a.active::after { width: 100%; }
    .btn-glow-nav {
      background: linear-gradient(135deg, var(--primary-cyan), var(--accent-violet));
      color: #070b19 !important;
      font-weight: 700;
      font-size: 14px;
      padding: 9px 22px;
      border-radius: 30px;
      box-shadow: var(--glow-cyan);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-glow-nav:hover {
      box-shadow: var(--glow-strong);
      transform: translateY(-2px);
      color: #ffffff !important;
    }
    .btn-cyan {
      background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-cyan-end) 100%);
      color: #070b19;
      font-weight: 700;
      padding: 13px 30px;
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: none;
      box-shadow: 0 0 24px rgba(0, 242, 254, 0.4);
      cursor: pointer;
    }
    .btn-cyan:hover {
      background: linear-gradient(135deg, #ffffff 0%, var(--primary-cyan) 100%);
      box-shadow: 0 0 32px rgba(0, 242, 254, 0.7);
      transform: translateY(-2px);
      color: #070b19;
    }
    .btn-outline-glow {
      background: rgba(16, 26, 60, 0.5);
      color: var(--text-main);
      font-weight: 600;
      padding: 13px 28px;
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid rgba(0, 242, 254, 0.4);
      box-shadow: inset 0 1px 1px rgba(255,255,255,0.1);
      cursor: pointer;
    }
    .btn-outline-glow:hover {
      background: rgba(0, 242, 254, 0.15);
      border-color: var(--primary-cyan);
      color: #ffffff;
      box-shadow: var(--glow-cyan);
      transform: translateY(-2px);
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.08), 0 12px 30px rgba(0, 0, 0, 0.35);
      padding: 26px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .glass-card:hover {
      border-color: var(--card-hover-border);
      transform: translateY(-4px);
      box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.15), 0 16px 36px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 242, 254, 0.2);
    }
    .section-wrap {
      padding: 75px 0;
      position: relative;
      border-bottom: 1px solid rgba(0, 242, 254, 0.08);
    }
    .section-wrap-alt {
      background: linear-gradient(180deg, rgba(11, 19, 43, 0.7) 0%, rgba(7, 11, 25, 0.85) 100%);
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 4px 12px;
      border-radius: 20px;
      background: rgba(0, 242, 254, 0.1);
      border: 1px solid rgba(0, 242, 254, 0.3);
      color: var(--primary-cyan);
      margin-bottom: 14px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: #ffffff;
      line-height: 1.35;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      max-width: 820px;
      margin-bottom: 35px;
    }
    .hero-section {
      padding: 90px 0 80px;
      background: radial-gradient(circle at 50% 20%, rgba(106, 17, 203, 0.25) 0%, transparent 60%),
                  radial-gradient(circle at 80% 50%, rgba(0, 242, 254, 0.15) 0%, transparent 50%),
                  url('/assets/images/ec5fbfb7fced134d.png') center/cover no-repeat;
      position: relative;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(7, 11, 25, 0.78);
      z-index: 1;
    }
    .hero-content { position: relative; z-index: 2; }
    .hero-h1 {
      font-size: 44px;
      font-weight: 800;
      color: #ffffff;
      line-height: 1.25;
      margin-bottom: 20px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }
    .hero-h1 span.cyan-text {
      background: linear-gradient(135deg, var(--primary-cyan), #a1f6ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }
    .hero-summary {
      font-size: 17px;
      color: #d1dcfa;
      line-height: 1.85;
      max-width: 780px;
      margin-bottom: 35px;
    }
    .hero-btn-group { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 45px; }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      padding-top: 25px;
      border-top: 1px solid rgba(0, 242, 254, 0.15);
    }
    .metric-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary-cyan);
      line-height: 1.1;
      font-family: "Courier New", Courier, monospace, sans-serif;
    }
    .metric-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
    .feature-icon-box {
      width: 54px;
      height: 54px;
      border-radius: 12px;
      background: rgba(0, 242, 254, 0.12);
      border: 1px solid rgba(0, 242, 254, 0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--primary-cyan);
      margin-bottom: 18px;
    }
    .feature-title { font-size: 19px; font-weight: 700; color: #ffffff; margin-bottom: 10px; }
    .feature-text { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
    .check-list-custom { list-style: none; margin: 0; padding: 0; }
    .check-list-custom li {
      display: flex;
      align-items: flex-start;
      margin-bottom: 14px;
      font-size: 15px;
      color: #d5e1fd;
      line-height: 1.6;
    }
    .check-list-custom li i {
      color: var(--primary-cyan);
      margin-right: 12px;
      margin-top: 4px;
      font-size: 16px;
    }
    .badge-item-box {
      text-align: center;
      padding: 24px 18px;
      border-radius: var(--radius-md);
      background: rgba(16, 26, 60, 0.5);
      border: 1px solid rgba(0, 242, 254, 0.15);
      transition: var(--transition);
    }
    .badge-item-box:hover {
      border-color: var(--primary-cyan);
      box-shadow: var(--glow-cyan);
      transform: translateY(-4px);
    }
    .badge-item-box i { font-size: 34px; color: var(--primary-cyan); margin-bottom: 12px; }
    .badge-item-box h4 { font-size: 16px; font-weight: 700; color: #ffffff; margin-bottom: 6px; }
    .badge-item-box p { font-size: 12px; color: var(--text-dim); margin-bottom: 0; }
    .news-meta { font-size: 12px; color: var(--primary-cyan); margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
    .news-card-title { font-size: 17px; font-weight: 700; color: #ffffff; margin-bottom: 10px; line-height: 1.4; }
    .news-card-excerpt { font-size: 14px; color: var(--text-muted); line-height: 1.65; margin-bottom: 16px; }
    .faq-accordion .accordion-item {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
    }
    .faq-accordion .accordion-title {
      font-size: 17px;
      font-weight: 600;
      color: #ffffff;
      padding: 18px 24px;
      background: transparent;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-accordion .accordion-title:hover {
      color: var(--primary-cyan);
      background: rgba(0, 242, 254, 0.04);
    }
    .faq-accordion .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.75;
      background: transparent;
      border: none;
      display: block;
    }
    .contact-form-box {
      max-width: 820px;
      margin: 0 auto;
      padding: 40px;
      background: rgba(16, 26, 60, 0.85);
      border: 1px solid rgba(0, 242, 254, 0.3);
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 50px rgba(0,0,0,0.6), 0 0 30px rgba(106, 17, 203, 0.25);
    }
    .form-group-label { font-size: 14px; font-weight: 600; color: #d0defa; margin-bottom: 8px; display: block; }
    .custom-input, .custom-select, .custom-textarea {
      width: 100%;
      background: rgba(7, 11, 25, 0.8);
      border: 1px solid rgba(0, 242, 254, 0.25);
      border-radius: var(--radius-sm);
      color: #ffffff;
      padding: 12px 16px;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      margin-bottom: 18px;
    }
    .custom-input:focus, .custom-select:focus, .custom-textarea:focus {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 12px rgba(0, 242, 254, 0.4);
      background: rgba(10, 18, 44, 0.95);
    }
    .checkbox-group { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 20px; }
    .checkbox-label {
      font-size: 13px;
      color: var(--text-muted);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
    }
    .checkbox-label input[type="checkbox"] { accent-color: var(--primary-cyan); }
    .site-footer {
      background: #040713;
      border-top: 1px solid rgba(0, 242, 254, 0.15);
      padding: 60px 0 25px;
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-col-title { font-size: 16px; font-weight: 700; color: #ffffff; margin-bottom: 20px; position: relative; }
    .footer-links-list { list-style: none; margin: 0; padding: 0; }
    .footer-links-list li { margin-bottom: 10px; }
    .footer-links-list li a { color: var(--text-muted); font-size: 14px; }
    .footer-links-list li a:hover { color: var(--primary-cyan); padding-left: 4px; }
    .footer-bottom-bar {
      margin-top: 45px;
      padding-top: 25px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      text-align: center;
      font-size: 13px;
      color: var(--text-dim);
    }
    .footer-bottom-bar a { color: var(--text-dim); margin: 0 8px; }
    .footer-bottom-bar a:hover { color: var(--primary-cyan); }
    @media screen and (max-width: 1023px) {
      .nav-links { display: none; }
      .hero-h1 { font-size: 34px; }
      .section-title { font-size: 26px; }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
    }
    @media screen and (max-width: 639px) {
      .top-bar-info { display: none; }
      .hero-h1 { font-size: 27px; }
      .hero-summary { font-size: 15px; }
      .hero-metrics { grid-template-columns: 1fr; }
      .contact-form-box { padding: 22px 16px; }
      .btn-cyan, .btn-outline-glow { width: 100%; justify-content: center; }
    }