/* roulang page: index */
:root {
      --deep-purple: #4B0082;
      --electric-blue: #007BFF;
      --neon-cyan: #00F0FF;
      --bg-deep: #0A0E17;
      --card-bg: rgba(20, 30, 50, 0.75);
      --text-white: #FFFFFF;
      --text-light-blue: #B0C4DE;
      --border-subtle: rgba(255, 255, 255, 0.1);
      --border-glow: rgba(0, 240, 255, 0.3);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 12px 40px rgba(0, 240, 255, 0.3);
      --gradient-brand: linear-gradient(135deg, #4B0082 0%, #007BFF 100%);
      --gradient-hero: linear-gradient(135deg, rgba(75, 0, 130, 0.88) 0%, rgba(0, 123, 255, 0.75) 100%);
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-btn: 50px;
      --transition-smooth: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-deep);
      color: var(--text-white);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
    }

    /* 基础排版 */
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
      background: linear-gradient(to right, #fff, #B0C4DE);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .text-light-blue {
      color: var(--text-light-blue);
    }

    /* 自定义容器 */
    .custom-container {
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      height: 72px;
      background: rgba(10, 14, 23, 0.92);
      backdrop-filter: blur(20px);
      border-bottom: 2px solid transparent;
      background-image: linear-gradient(rgba(10,14,23,0.92), rgba(10,14,23,0.92)), linear-gradient(90deg, var(--neon-cyan), var(--electric-blue));
      background-origin: border-box;
      background-clip: padding-box, border-box;
      display: flex;
      align-items: center;
    }

    .brand-logo {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(to right, #C084FC, var(--neon-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-decoration: none;
      letter-spacing: 1px;
    }

    .nav-link-custom {
      color: var(--text-light-blue);
      font-weight: 500;
      margin: 0 8px;
      transition: color 0.25s;
      text-decoration: none;
      position: relative;
    }

    .nav-link-custom:hover,
    .nav-link-custom.active {
      color: var(--neon-cyan);
    }

    .nav-link-custom.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--neon-cyan);
      box-shadow: 0 0 10px var(--neon-cyan);
    }

    .btn-primary-glow {
      background: var(--gradient-brand);
      border: none;
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 28px;
      font-weight: 600;
      box-shadow: 0 4px 15px rgba(0,123,255,0.5);
      transition: all 0.25s ease;
    }

    .btn-primary-glow:hover {
      background: linear-gradient(135deg, #007BFF 0%, #4B0082 100%);
      box-shadow: 0 0 25px rgba(0,240,255,0.7);
      color: white;
      transform: scale(1.02);
    }

    .btn-outline-neon {
      background: transparent;
      border: 2px solid var(--neon-cyan);
      color: var(--neon-cyan);
      border-radius: var(--radius-btn);
      padding: 10px 28px;
      font-weight: 600;
      transition: 0.25s ease;
    }

    .btn-outline-neon:hover {
      background: rgba(0,240,255,0.15);
      border-color: #fff;
      color: #fff;
      box-shadow: 0 0 18px rgba(0,240,255,0.6);
    }

    /* 卡片系统 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      padding: 2rem;
      height: 100%;
    }

    .glass-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,240,255,0.5);
      transform: translateY(-4px);
    }

    /* Hero 区域 */
    .hero-section {
      min-height: 100vh;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
    }

    .hero-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: var(--gradient-hero);
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero-title {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.2;
      text-shadow: 0 0 30px rgba(0,0,0,0.6);
    }

    .badge-float {
      background: rgba(10,20,40,0.8);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(0,240,255,0.5);
      border-radius: 20px;
      padding: 14px 24px;
      color: white;
      font-weight: 600;
      box-shadow: 0 8px 20px rgba(0,0,0,0.5);
      animation: floatBadge 4s infinite alternate ease-in-out;
    }

    @keyframes floatBadge {
      0% { transform: translateY(0); }
      100% { transform: translateY(-12px); }
    }

    /* 区块间距 */
    .section-padding {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
      .hero-title {
        font-size: 2.5rem;
      }
      .section-title {
        font-size: 2rem;
      }
    }

    /* 解决方案编号 */
    .step-number {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(180deg, #B084FC, var(--neon-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1;
    }

    .image-glow {
      border-radius: var(--radius-lg);
      border: 2px solid rgba(0,240,255,0.35);
      box-shadow: 0 0 35px rgba(0,123,255,0.4);
    }

    /* 数据徽章 */
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      background: linear-gradient(to right, #fff, var(--neon-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .testimonial-card {
      background: rgba(25, 35, 55, 0.7);
      backdrop-filter: blur(10px);
      border-left: 4px solid var(--neon-cyan);
      border-radius: 12px;
    }

    /* FAQ 手风琴自定义 */
    .accordion-button:not(.collapsed) {
      background-color: rgba(20,30,55,0.9);
      color: white;
      box-shadow: none;
    }
    .accordion-button {
      background-color: rgba(15,22,38,0.9);
      color: #e0e0e0;
      border-radius: 12px !important;
      margin-bottom: 8px;
      font-weight: 600;
    }
    .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 12px;
    }
    .accordion-button::after {
      filter: brightness(3);
    }
    .accordion-body {
      background: rgba(10,15,25,0.7);
      color: var(--text-light-blue);
    }

    /* 页脚 */
    .footer-section {
      background: #060A10;
      border-top: 2px solid rgba(0,240,255,0.2);
    }

    .footer-link {
      color: var(--text-light-blue);
      text-decoration: none;
      transition: 0.2s;
    }
    .footer-link:hover {
      color: var(--neon-cyan);
    }

    /* 移动端调整 */
    @media (max-width: 576px) {
      .hero-title {
        font-size: 2rem;
      }
    }