/* roulang page: index */
:root {
      --bg-dark: #0F141C;
      --bg-surface: #1B222E;
      --bg-card: #232C3B;
      --bg-light: #F4F6F9;
      --text-main: #FFFFFF;
      --text-muted: #8E9BAE;
      --text-dark: #121824;
      --text-body: #4A5568;
      --neon-green: #00E599;
      --neon-orange: #FF5C00;
      --border-color: #2D3748;
      --border-light: #E2E8F0;
      --radius-sm: 4px;
      --radius-md: 8px;
      --shadow-card: 0 12px 32px -4px rgba(15, 20, 28, 0.12);
      --shadow-neon: 0 0 20px rgba(0, 229, 153, 0.35);
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.65;
      margin: 0;
      padding: 0;
    }
    a { text-decoration: none; transition: all 0.25s ease; }
    img { max-width: 100%; height: auto; display: block; }

    /* Top Bar */
    .top-bar {
      background-color: #0B0E14;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.825rem;
      color: var(--text-muted);
      padding: 8px 0;
    }
    .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(0, 229, 153, 0.1);
      color: var(--neon-green);
      padding: 2px 10px;
      border-radius: 20px;
      border: 1px solid rgba(0, 229, 153, 0.3);
      font-size: 0.75rem;
    }
    .status-dot {
      width: 7px;
      height: 7px;
      background-color: var(--neon-green);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--neon-green);
    }

    /* Main Navigation */
    .site-nav {
      background: rgba(15, 20, 28, 0.94);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      position: sticky;
      top: 0;
      z-index: 1000;
      padding: 12px 0;
    }
    .brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }
    .brand-logo i {
      color: var(--neon-green);
      font-size: 1.5rem;
    }
    .nav-tabs-segmented {
      display: flex;
      background: #141A23;
      padding: 4px;
      border-radius: 30px;
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .nav-tabs-segmented .nav-link {
      color: #A0AEC0;
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 0.875rem;
      font-weight: 500;
      border: none;
      transition: all 0.2s;
    }
    .nav-tabs-segmented .nav-link:hover,
    .nav-tabs-segmented .nav-link.active {
      color: #0F141C;
      background: var(--neon-green);
      box-shadow: 0 2px 8px rgba(0, 229, 153, 0.4);
    }
    .btn-action-glow {
      background: var(--neon-green);
      color: #0F141C;
      font-weight: 700;
      font-size: 0.875rem;
      padding: 9px 22px;
      border-radius: var(--radius-sm);
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: var(--shadow-neon);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-action-glow:hover {
      background: #00ffaa;
      color: #0F141C;
      transform: translateY(-2px);
      box-shadow: 0 0 25px rgba(0, 229, 153, 0.55);
    }

    /* Section Global Styles */
    section {
      padding: 90px 0;
      position: relative;
    }
    .section-title-wrap {
      margin-bottom: 54px;
    }
    .section-badge {
      display: inline-block;
      font-size: 0.78rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 14px;
    }
    .section-badge-green {
      background: rgba(0, 229, 153, 0.12);
      color: var(--neon-green);
      border: 1px solid rgba(0, 229, 153, 0.3);
    }
    .section-badge-orange {
      background: rgba(255, 92, 0, 0.12);
      color: var(--neon-orange);
      border: 1px solid rgba(255, 92, 0, 0.3);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: #64748B;
      max-width: 780px;
      margin: 0 auto;
    }

    /* Hero Section */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, #1A2736 0%, var(--bg-dark) 70%);
      color: var(--text-main);
      padding: 110px 0 90px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      position: relative;
      overflow: hidden;
    }
    .hero-badge-live {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 92, 0, 0.15);
      border: 1px solid rgba(255, 92, 0, 0.4);
      color: var(--neon-orange);
      font-size: 0.85rem;
      padding: 6px 14px;
      border-radius: 30px;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 3.1rem;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-title span {
      color: var(--neon-green);
      text-shadow: 0 0 20px rgba(0, 229, 153, 0.3);
    }
    .hero-lead {
      font-size: 1.15rem;
      color: #A0AEC0;
      line-height: 1.8;
      margin-bottom: 36px;
    }
    .countdown-ring-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .metric-pulse-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 36px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
    }
    .metric-pulse-item h4 {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
      font-family: monospace;
    }
    .metric-pulse-item p {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin: 0;
    }

    /* Cards & Grids */
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      transition: all 0.3s ease;
      height: 100%;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      border-color: var(--neon-green);
      box-shadow: 0 14px 28px rgba(0, 229, 153, 0.12);
    }
    .feature-icon-box {
      width: 54px;
      height: 54px;
      background: rgba(0, 229, 153, 0.1);
      color: #0F141C;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 1.4rem;
      margin-bottom: 22px;
    }
    .pain-card {
      background: #FFFFFF;
      border-left: 4px solid #E53E3E;
      border-radius: var(--radius-sm);
      padding: 26px;
      box-shadow: var(--shadow-card);
      height: 100%;
    }
    .pain-badge {
      font-size: 0.72rem;
      background: #FFF5F5;
      color: #E53E3E;
      padding: 2px 8px;
      font-weight: 700;
      border-radius: 2px;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* Dark Mode Sections */
    .bg-dark-engine {
      background-color: var(--bg-dark);
      color: var(--text-main);
    }
    .bg-dark-surface {
      background-color: var(--bg-surface);
      color: var(--text-main);
    }
    .engine-terminal {
      background: #0B0E14;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      font-family: monospace;
      color: #A0AEC0;
      font-size: 0.875rem;
    }
    .param-table-dark {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0 8px;
    }
    .param-table-dark td {
      background: #18202C;
      padding: 14px 18px;
      border: none;
      color: #E2E8F0;
    }
    .param-table-dark td:first-child {
      border-top-left-radius: 4px;
      border-bottom-left-radius: 4px;
      font-weight: 600;
      color: var(--neon-green);
    }
    .param-table-dark td:last-child {
      border-top-right-radius: 4px;
      border-bottom-right-radius: 4px;
      text-align: right;
    }

    /* Steps Flow */
    .step-track-item {
      position: relative;
      padding: 30px 24px;
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      height: 100%;
    }
    .step-number {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1;
      color: rgba(15, 20, 28, 0.08);
      position: absolute;
      top: 18px;
      right: 20px;
    }

    /* Stats Banner */
    .stats-stripe {
      background: linear-gradient(90deg, #0F141C 0%, #17212F 100%);
      color: var(--text-main);
      padding: 60px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .stat-number-box {
      font-size: 3rem;
      font-weight: 900;
      color: var(--neon-green);
      font-family: monospace;
      line-height: 1.1;
      margin-bottom: 6px;
    }

    /* Accordion Redesign */
    .custom-accordion .accordion-item {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
    }
    .custom-accordion .accordion-button {
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-dark);
      background: #FFFFFF;
      padding: 20px 24px;
      box-shadow: none;
    }
    .custom-accordion .accordion-button:not(.collapsed) {
      color: var(--neon-orange);
      background: #FAFAFB;
    }
    .custom-accordion .accordion-body {
      color: #64748B;
      font-size: 0.95rem;
      line-height: 1.8;
      padding: 0 24px 22px;
    }

    /* Form Card */
    .lead-form-card {
      background: #141A23;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 40px;
    }
    .form-control, .form-select {
      background: #0B0E14;
      border: 1px solid var(--border-color);
      color: #FFFFFF;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
    }
    .form-control:focus, .form-select:focus {
      background: #0B0E14;
      border-color: var(--neon-green);
      color: #FFFFFF;
      box-shadow: 0 0 10px rgba(0, 229, 153, 0.25);
    }

    /* Footer */
    .site-footer {
      background: #0B0E14;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      color: var(--text-muted);
      padding: 70px 0 30px;
      font-size: 0.9rem;
    }
    .site-footer h6 {
      color: var(--text-main);
      font-weight: 700;
      margin-bottom: 20px;
      font-size: 1rem;
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: var(--text-muted);
    }
    .footer-links a:hover {
      color: var(--neon-green);
    }

    @media (max-width: 991px) {
      .hero-title { font-size: 2.3rem; }
      .nav-tabs-segmented { display: none; }
      .metric-pulse-grid { grid-template-columns: 1fr; }
    }