/* roulang page: index */
:root {
      --deep-bg: #0A1929;
      --section-bg: #112240;
      --glass-bg: rgba(17, 34, 64, 0.6);
      --glass-border: rgba(255, 255, 255, 0.08);
      --primary-cyan: #00E5FF;
      --accent-purple: #7B61FF;
      --text-main: #E6F1FF;
      --text-muted: #8892B0;
      --card-radius: 16px;
      --btn-radius: 8px;
      --dock-radius: 24px;
      --transition-smooth: all 0.3s ease;
      --glow-cyan: 0 0 15px rgba(0, 229, 255, 0.4);
      --glow-cyan-hover: 0 0 25px rgba(0, 229, 255, 0.6);
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--deep-bg);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    /* 自定义容器宽度与间距 */
    .container-custom {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 浮动Dock导航 */
    .dock-nav {
      position: sticky;
      top: 16px;
      z-index: 1050;
      display: flex;
      justify-content: center;
      pointer-events: none;
    }
    .dock-container {
      pointer-events: auto;
      max-width: 1100px;
      width: 100%;
      background: rgba(10, 25, 41, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--dock-radius);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 8px 20px rgba(0,0,0,0.5);
      transition: var(--transition-smooth);
    }
    .logo-text {
      font-size: 1.6rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-cyan), var(--accent-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: var(--transition-smooth);
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background: var(--primary-cyan);
      box-shadow: 0 0 8px var(--primary-cyan);
    }
    .btn-dock-cta {
      background: var(--primary-cyan);
      color: var(--deep-bg);
      border: none;
      padding: 8px 20px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: var(--glow-cyan);
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-dock-cta:hover {
      background: #33eaff;
      box-shadow: var(--glow-cyan-hover);
      color: var(--deep-bg);
    }

    /* 移动端导航汉堡菜单 */
    .navbar-toggler-custom {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: 8px;
      display: none;
    }
    @media (max-width: 768px) {
      .nav-links, .dock-container .btn-dock-cta {
        display: none;
      }
      .navbar-toggler-custom {
        display: block;
      }
      .dock-container {
        padding: 12px 20px;
      }
    }
    .offcanvas-glass {
      background: rgba(10, 25, 41, 0.95);
      backdrop-filter: blur(20px);
      color: var(--text-main);
    }
    .offcanvas-glass .nav-link {
      color: var(--text-muted);
      font-size: 1.2rem;
      margin: 10px 0;
    }
    .offcanvas-glass .nav-link:hover {
      color: var(--primary-cyan);
    }

    /* 通用玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .glass-card:hover {
      border-color: rgba(0, 229, 255, 0.3);
      box-shadow: 0 0 25px rgba(0, 229, 255, 0.15);
      transform: translateY(-4px);
    }

    /* 按钮重置 */
    .btn-primary-custom {
      background: var(--primary-cyan);
      color: var(--deep-bg);
      border: none;
      border-radius: var(--btn-radius);
      padding: 12px 28px;
      font-weight: 600;
      box-shadow: var(--glow-cyan);
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background: #33eaff;
      box-shadow: var(--glow-cyan-hover);
      transform: translateY(-2px);
      color: var(--deep-bg);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1px solid rgba(0, 229, 255, 0.4);
      color: var(--primary-cyan);
      border-radius: var(--btn-radius);
      padding: 12px 28px;
      font-weight: 500;
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline-custom:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: var(--primary-cyan);
      box-shadow: var(--glow-cyan);
      color: var(--primary-cyan);
    }

    /* 标题 */
    h1 {
      font-weight: 700;
      font-size: 3.5rem;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    h2 {
      font-weight: 600;
      font-size: 2.5rem;
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    h3 {
      font-weight: 500;
      font-size: 1.5rem;
      line-height: 1.4;
    }
    .text-muted-custom {
      color: var(--text-muted);
    }
    .text-cyan {
      color: var(--primary-cyan);
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
      h3 { font-size: 1.25rem; }
      section { padding: 60px 0; }
    }

    /* Hero背景 */
    .hero-section {
      background: radial-gradient(circle at 30% 40%, #112240 0%, #0A1929 80%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid-bg {
      position: absolute;
      top:0; left:0; right:0; bottom:0;
      background-image: linear-gradient(rgba(0,229,255,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(0,229,255,0.05) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
    }

    /* FAQ手风琴覆盖 */
    .accordion-item {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .accordion-button {
      background: rgba(17,34,64,0.8);
      color: var(--text-main);
      font-weight: 500;
      padding: 20px 24px;
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--primary-cyan);
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,229,255,0.08);
      color: var(--primary-cyan);
      box-shadow: none;
    }
    .accordion-button::after {
      filter: invert(0.8);
    }
    .accordion-body {
      color: var(--text-muted);
      padding: 20px 24px;
      background: rgba(17,34,64,0.4);
    }

    /* 页脚 */
    footer a {
      color: var(--text-muted);
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    footer a:hover {
      color: var(--primary-cyan);
    }
    .footer-brand {
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-cyan), var(--accent-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 流程步骤连接线 */
    .step-connector {
      position: relative;
    }
    @media (min-width: 769px) {
      .step-row {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        position: relative;
      }
      .step-row::before {
        content: '';
        position: absolute;
        top: 40px;
        left: 10%;
        right: 10%;
        height: 2px;
        background: linear-gradient(90deg, var(--primary-cyan), var(--accent-purple));
        box-shadow: 0 0 8px var(--primary-cyan);
        z-index: 0;
      }
    }
    .step-item {
      position: relative;
      z-index: 2;
      text-align: center;
      flex: 1;
    }
    .step-number {
      font-size: 3rem;
      font-weight: 700;
      color: rgba(0,229,255,0.2);
      margin-bottom: 10px;
    }

    .img-cover {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 12px;
    }