/* roulang page: index */
:root {
      --primary: #00F0FF;
      --primary-dark: #0088FF;
      --secondary-bg: #0A0E27;
      --card-bg: #1A1F3A;
      --accent: #FF3366;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8D0;
      --text-muted: #4A5072;
      --border-light: rgba(0, 240, 255, 0.15);
      --border-glow: rgba(0, 240, 255, 0.4);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.4);
      --gradient-main: linear-gradient(135deg, #00F0FF 0%, #0088FF 100%);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --font-tech: 'Orbitron', 'Rajdhani', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--secondary-bg);
      color: var(--text-primary);
      font-family: var(--font-body);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
      position: relative;
    }
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.08) 0%, transparent 35%),
                        radial-gradient(circle at 80% 70%, rgba(0,136,255,0.05) 0%, transparent 40%);
      pointer-events: none;
      z-index: 0;
    }
    .container {
      max-width: 1140px;
      padding-left: 20px;
      padding-right: 20px;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.3;
    }
    a {
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 导航 */
    .navbar {
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      padding: 0 1rem;
      height: 70px;
      transition: all 0.3s ease;
      z-index: 1030;
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .navbar-brand {
      font-family: var(--font-tech);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary) !important;
      letter-spacing: 1px;
      text-shadow: 0 0 12px rgba(0,240,255,0.6);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .navbar-brand i {
      font-size: 1.8rem;
      color: var(--primary);
    }
    .nav-link {
      color: var(--text-secondary) !important;
      font-weight: 500;
      font-size: 0.9rem;
      margin: 0 6px;
      padding: 0.5rem 0.8rem !important;
      position: relative;
      letter-spacing: 0.3px;
      transition: 0.25s ease;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 70%;
    }
    .navbar-toggler {
      border: 1px solid var(--primary);
      padding: 0.25rem 0.5rem;
    }
    .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, 240, 255, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 992px) {
      .navbar-collapse {
        background: #0A0E27;
        padding: 1rem;
        border-radius: 0 0 16px 16px;
        border: 1px solid rgba(0,240,255,0.2);
      }
    }
    /* 区块通用 */
    section {
      padding: 100px 0;
      position: relative;
      z-index: 2;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--text-primary);
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      max-width: 600px;
      margin: 0 auto 3rem;
    }
    .glass-card {
      background: rgba(26, 31, 58, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.45);
      box-shadow: 0 12px 36px rgba(0, 240, 255, 0.25);
      transform: translateY(-4px);
    }
    .btn-primary-vs {
      background: var(--gradient-main);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      letter-spacing: 0.5px;
      box-shadow: 0 4px 15px rgba(0,240,255,0.4);
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-primary-vs:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.7);
      transform: translateY(-2px);
      color: #0A0E27;
      background: linear-gradient(135deg, #33f5ff 0%, #1a9eff 100%);
    }
    .btn-outline-vs {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      transition: 0.3s;
    }
    .btn-outline-vs:hover {
      background: rgba(0,240,255,0.12);
      border-color: #fff;
      color: #fff;
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-visual {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background: radial-gradient(circle at 30% 50%, rgba(0,240,255,0.12) 0%, transparent 60%);
      z-index: 0;
    }
    .hero-title {
      font-size: 3.6rem;
      font-weight: 800;
      line-height: 1.2;
      color: #fff;
    }
    .hero-visual-container {
      width: 400px;
      height: 400px;
      background: rgba(26,31,58,0.5);
      backdrop-filter: blur(16px);
      border-radius: 50%;
      border: 1px solid rgba(0,240,255,0.25);
      box-shadow: 0 0 60px rgba(0,240,255,0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }
    /* 图标容器 */
    .icon-glow {
      width: 52px;
      height: 52px;
      background: var(--gradient-main);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0A0E27;
      font-size: 1.8rem;
    }
    /* 场景编号 */
    .scenario-number {
      font-size: 6rem;
      font-weight: 900;
      color: rgba(0,240,255,0.08);
      position: absolute;
      left: 10px;
      top: -15px;
      line-height: 1;
      font-family: var(--font-tech);
    }
    .tag-pill {
      background: rgba(0,240,255,0.1);
      color: var(--primary);
      padding: 4px 14px;
      border-radius: 30px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    /* 价格高亮 */
    .pricing-highlight {
      transform: scale(1.05);
      border: 1px solid var(--primary);
      box-shadow: 0 0 30px rgba(0,240,255,0.5);
    }
    .price-digit {
      font-size: 3rem;
      font-weight: 800;
      text-shadow: 0 0 18px rgba(0,240,255,0.7);
    }
    /* FAQ */
    .accordion-button {
      background: transparent;
      color: #fff;
      font-weight: 600;
      border-bottom: 1px solid rgba(0,240,255,0.12);
      padding: 1.2rem 0;
      font-size: 1rem;
    }
    .accordion-button::before {
      content: "// ";
      color: var(--primary);
      font-weight: 700;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,240,255,0.03);
      box-shadow: none;
    }
    .accordion-item {
      background: transparent;
      border: none;
    }
    footer {
      background: #060918;
      border-top: 1px solid rgba(0,240,255,0.15);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .glass-card {
        backdrop-filter: none;
        background: rgba(26,31,58,0.85);
      }
    }