/* roulang page: index */
:root {
      --bg-base: #0B0E14;
      --bg-surface: #121721;
      --bg-card: #18202F;
      --bg-footer: #07090D;
      --brand-green: #00E599;
      --brand-green-hover: #00c784;
      --accent-blue: #00A3FF;
      --accent-amber: #F5A623;
      --text-main: #F0F4F8;
      --text-muted: #94A3B8;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-active: rgba(0, 229, 153, 0.4);
      --card-radius: 10px;
      --btn-radius: 6px;
      --transition-smooth: cubic-bezier(0.16, 1, 0.3, 1) 0.3s;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all var(--transition-smooth);
    }

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

    /* TopBar */
    .top-bar {
      background: var(--bg-footer);
      font-size: 0.8125rem;
      border-bottom: 1px solid var(--border-subtle);
      padding: 6px 0;
      color: var(--text-muted);
    }
    .status-dot {
      display: inline-block;
      width: 7px;
      height: 7px;
      background-color: var(--brand-green);
      border-radius: 50%;
      margin-right: 6px;
      box-shadow: 0 0 8px var(--brand-green);
    }

    /* Main Navbar */
    .main-navbar {
      background: rgba(11, 14, 20, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-subtle);
      padding: 14px 0;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .brand-logo-text {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .brand-logo-text .badge-ai {
      background: rgba(0, 229, 153, 0.12);
      border: 1px solid var(--border-active);
      color: var(--brand-green);
      font-size: 0.72rem;
      padding: 2px 8px;
      border-radius: 4px;
      font-weight: 600;
    }
    .nav-link-custom {
      color: var(--text-muted);
      font-size: 0.9375rem;
      font-weight: 500;
      padding: 8px 14px !important;
      border-radius: 4px;
    }
    .nav-link-custom:hover {
      color: #fff;
      background: rgba(255, 255, 255, 0.04);
    }
    .btn-brand-cta {
      background: var(--brand-green);
      color: #05140f;
      font-weight: 700;
      font-size: 0.875rem;
      padding: 9px 20px;
      border-radius: var(--btn-radius);
      border: 1px solid transparent;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all var(--transition-smooth);
    }
    .btn-brand-cta:hover {
      background: var(--brand-green-hover);
      color: #000;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0, 229, 153, 0.25);
    }
    .btn-brand-outline {
      background: rgba(255, 255, 255, 0.04);
      color: var(--text-main);
      border: 1px solid var(--border-subtle);
      font-weight: 600;
      font-size: 0.875rem;
      padding: 9px 20px;
      border-radius: var(--btn-radius);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all var(--transition-smooth);
    }
    .btn-brand-outline:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: rgba(255, 255, 255, 0.2);
      color: #fff;
    }

    /* Section Base */
    .section-padding {
      padding: 85px 0;
      position: relative;
    }
    .section-title-wrap {
      margin-bottom: 45px;
    }
    .section-kicker {
      color: var(--brand-green);
      font-size: 0.825rem;
      text-transform: uppercase;
      font-weight: 700;
      letter-spacing: 0.08em;
      margin-bottom: 8px;
      display: inline-block;
    }
    .section-heading {
      font-size: 2.15rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-lead {
      color: var(--text-muted);
      font-size: 1rem;
      max-width: 820px;
      margin: 0 auto;
      line-height: 1.7;
    }

    /* Cards System */
    .rn-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--card-radius);
      padding: 28px;
      transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
      height: 100%;
      position: relative;
      overflow: hidden;
    }
    .rn-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-active);
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
    }
    .card-icon-sq {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: rgba(0, 229, 153, 0.08);
      border: 1px solid rgba(0, 229, 153, 0.2);
      color: var(--brand-green);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 20px;
    }

    /* Hero Center Stage */
    .hero-center-stage {
      background: radial-gradient(circle at 50% 20%, rgba(0, 163, 255, 0.12) 0%, rgba(11, 14, 20, 1) 70%), url('/assets/images/a30c252241095490.webp') center/cover no-repeat;
      padding: 95px 0 65px;
      border-bottom: 1px solid var(--border-subtle);
      position: relative;
    }
    .hero-stage-box {
      border: 1px solid rgba(255, 255, 255, 0.14);
      background: rgba(18, 23, 33, 0.78);
      backdrop-filter: blur(16px);
      border-radius: 14px;
      overflow: hidden;
      box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
      margin-top: 36px;
    }
    .hero-stage-header {
      background: rgba(7, 9, 13, 0.8);
      padding: 10px 18px;
      border-bottom: 1px solid var(--border-subtle);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* Dashboard Mockup Component */
    .metric-value-huge {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      font-size: 2.75rem;
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1;
      color: #fff;
    }
    .metric-unit {
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--brand-green);
      margin-left: 4px;
    }

    /* Custom Accordion */
    .accordion-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      margin-bottom: 12px;
      border-radius: 8px !important;
      overflow: hidden;
    }
    .accordion-button {
      background: var(--bg-surface);
      color: var(--text-main);
      font-weight: 600;
      font-size: 1.025rem;
      box-shadow: none !important;
      padding: 18px 22px;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0, 229, 153, 0.05);
      color: var(--brand-green);
      border-bottom: 1px solid var(--border-subtle);
    }
    .accordion-button::after {
      filter: invert(1);
    }
    .accordion-body {
      color: var(--text-muted);
      padding: 20px 22px;
      line-height: 1.7;
    }

    /* Form Customization */
    .rn-input {
      background: rgba(7, 9, 13, 0.7);
      border: 1px solid var(--border-subtle);
      color: #fff;
      border-radius: 6px;
      padding: 12px 16px;
      font-size: 0.9375rem;
    }
    .rn-input:focus {
      background: rgba(7, 9, 13, 0.95);
      border-color: var(--brand-green);
      color: #fff;
      box-shadow: 0 0 0 3px rgba(0, 229, 153, 0.15);
    }
    .rn-input::placeholder {
      color: #64748b;
    }

    /* Footer Base */
    footer {
      background: var(--bg-footer);
      border-top: 1px solid var(--border-subtle);
      padding: 70px 0 30px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .footer-heading {
      color: #fff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-nav li {
      margin-bottom: 10px;
    }
    .footer-nav a:hover {
      color: var(--brand-green);
      padding-left: 4px;
    }

    @media (max-width: 991px) {
      .section-heading { font-size: 1.85rem; }
      .section-padding { padding: 65px 0; }
    }
    @media (max-width: 767px) {
      .section-heading { font-size: 1.55rem; }
      .metric-value-huge { font-size: 2.15rem; }
      .hero-center-stage { padding: 65px 0 45px; }
    }