/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-glow: rgba(0, 230, 118, 0.5);
      --secondary-bg: #0B0F19;
      --card-bg: rgba(20, 26, 42, 0.55);
      --card-border: rgba(0, 230, 118, 0.18);
      --text-light: #F4F6FB;
      --text-muted: rgba(244, 246, 251, 0.7);
      --text-dim: rgba(244, 246, 251, 0.55);
      --amber: #FFAB00;
      --pink-neon: #FF4081;
      --font-mono: 'Inter', 'SF Mono', 'Roboto Mono', monospace;
      --border-radius-card: 16px;
      --shadow-card: 0 8px 32px rgba(0, 230, 118, 0.08);
      --shadow-card-hover: 0 16px 48px rgba(0, 230, 118, 0.18);
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--secondary-bg);
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      color: var(--text-light);
      margin: 0;
      line-height: 1.75;
      background-image: 
        linear-gradient(rgba(0, 230, 118, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 230, 118, 0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .nav-link, .btn {
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.5rem;
    }

    @media (min-width: 992px) {
      h2 {
        font-size: 2.8rem;
      }
    }

    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航栏 */
    .navbar {
      background: rgba(11, 15, 25, 0.8);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(0, 230, 118, 0.15);
      padding: 0.8rem 0;
    }

    .navbar-brand {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--text-light) !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      border: 1.5px solid var(--primary);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1rem;
    }

    .nav-link {
      color: var(--text-muted) !important;
      margin: 0 0.5rem;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 0.5rem 0.8rem !important;
      position: relative;
      transition: color 0.2s;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 10px var(--primary-glow);
      border-radius: 2px;
    }

    .navbar-toggler {
      border: 1px solid rgba(0, 230, 118, 0.4);
      color: var(--primary);
    }

    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 230, 118, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    @media (max-width: 991px) {
      .navbar-collapse {
        background: rgba(11, 15, 25, 0.95);
        backdrop-filter: blur(14px);
        padding: 1rem;
        border-radius: 16px;
        margin-top: 1rem;
        border: 1px solid rgba(0,230,118,0.2);
      }
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 80% 20%, rgba(0,230,118,0.12) 0%, transparent 60%);
      position: relative;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 700;
      text-shadow: 0 0 28px rgba(0,230,118,0.35);
    }

    .hero-title span {
      color: var(--primary);
    }

    @media (min-width: 768px) {
      .hero-title {
        font-size: 3.8rem;
      }
    }

    .hero-subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      max-width: 480px;
      margin: 1.2rem 0 2rem;
    }

    .btn-primary-custom {
      background: var(--primary);
      color: #0B0F19;
      border-radius: 50px;
      padding: 14px 36px;
      font-weight: 600;
      border: none;
      box-shadow: 0 0 24px var(--primary-glow);
      transition: all 0.3s;
    }

    .btn-primary-custom:hover {
      background: #1aff8c;
      box-shadow: 0 0 36px rgba(0,230,118,0.7);
      color: #0B0F19;
    }

    .btn-outline-custom {
      border: 1.5px solid rgba(0,230,118,0.5);
      color: var(--primary);
      background: transparent;
      border-radius: 50px;
      padding: 14px 36px;
      font-weight: 600;
      transition: 0.3s;
    }

    .btn-outline-custom:hover {
      border-color: var(--primary);
      background: rgba(0,230,118,0.1);
      color: var(--primary);
    }

    .live-board {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
    }

    .live-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 18px;
      font-family: var(--font-mono);
    }

    .blink-dot {
      width: 10px;
      height: 10px;
      background: var(--amber);
      border-radius: 50%;
      display: inline-block;
      animation: pulse-dot 1.2s infinite;
    }

    @keyframes pulse-dot {
      0% { opacity: 0.6; transform: scale(0.9); }
      50% { opacity: 1; transform: scale(1.2); background: #FFAB00; }
      100% { opacity: 0.6; transform: scale(0.9); }
    }

    /* 卡片通用 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      height: 100%;
    }

    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      border-color: rgba(0,230,118,0.35);
    }

    .metric-value {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: white;
      text-shadow: 0 0 12px rgba(0,230,118,0.5);
    }

    .service-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }

    .divider-line {
      width: 30px;
      height: 2px;
      background: linear-gradient(to right, var(--primary), transparent);
      margin: 12px 0 16px;
    }

    .comparison-left {
      background: rgba(255,255,255,0.03);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 16px;
    }

    .comparison-right {
      background: rgba(0,230,118,0.06);
      border: 1px solid var(--card-border);
      border-radius: 16px;
      box-shadow: 0 0 24px rgba(0,230,118,0.1);
    }

    .strikethrough {
      text-decoration: line-through;
      color: rgba(244,246,251,0.5);
    }

    .faq-accordion .accordion-button {
      background: transparent;
      color: var(--text-muted);
      font-weight: 600;
      border: none;
      box-shadow: none;
      padding: 1.2rem 1.5rem;
    }

    .faq-accordion .accordion-item {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-border);
      border-radius: 12px !important;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-accordion .accordion-button:not(.collapsed) {
      background: rgba(0,230,118,0.08);
      color: white;
      border-left: 3px solid var(--primary);
    }

    .cta-section {
      background: linear-gradient(135deg, rgba(0,230,118,0.03) 0%, transparent 80%);
      padding: 80px 0;
      position: relative;
    }

    .footer {
      background: #080c14;
      border-top: 1px solid rgba(0,230,118,0.1);
      color: var(--text-dim);
    }

    .footer a {
      color: var(--text-dim);
      text-decoration: none;
      transition: 0.2s;
    }

    .footer a:hover {
      color: var(--primary);
    }

    .social-icon {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: rgba(255,255,255,0.05);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
      transition: 0.2s;
    }

    .social-icon:hover {
      background: var(--primary);
      color: #0B0F19;
    }

    input.form-control {
      background: rgba(20,26,42,0.7);
      border: 1px solid rgba(0,230,118,0.3);
      border-radius: 50px;
      color: white;
      padding: 14px 24px;
    }

    input.form-control::placeholder {
      color: rgba(244,246,251,0.4);
    }

    @media (max-width: 767px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .metric-value {
        font-size: 2rem;
      }
      .glass-card {
        padding: 20px;
      }
    }