/* roulang page: index */
:root {
      --primary-neon: #C4FF0E;
      --accent-cyan: #00F0FF;
      --deep-space: #0A0E17;
      --white-matte: #F2F4F8;
      --gray-cool: #8A8F98;
      --text-body: #C0C4CC;
      --card-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 240, 255, 0.1);
      --glass-border-hover: rgba(0, 240, 255, 0.4);
      --radius-lg: 12px;
      --radius-pill: 40px;
      --shadow-glow: 0 0 20px rgba(196, 255, 14, 0.4);
      --shadow-glow-hover: 0 0 40px rgba(196, 255, 14, 0.7);
      --transition-smooth: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--deep-space);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 30% 20%, rgba(0, 240, 255, 0.03) 0%, transparent 40%);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    h1, h2, h3, h4 {
      color: var(--white-matte);
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: clamp(2.8rem, 6vw, 4.5rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      text-shadow: 0 0 30px rgba(196, 255, 14, 0.3);
      margin-bottom: 1.5rem;
    }

    h2 {
      font-size: clamp(2rem, 4vw, 2.8rem);
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    .section-title {
      margin-bottom: 2.5rem;
    }

    .section-subtitle {
      color: var(--gray-cool);
      font-size: 1.125rem;
      max-width: 700px;
    }

    /* 浮动导航 */
    #main-nav {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 40px);
      max-width: 1100px;
      z-index: 100;
      background: rgba(10, 14, 23, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(0, 240, 255, 0.15);
      border-radius: var(--radius-pill);
      padding: 0.75rem 1.8rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition-smooth);
    }

    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white-matte);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-logo i {
      color: var(--primary-neon);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-links a {
      color: var(--gray-cool);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition-smooth);
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-neon);
    }

    .nav-cta {
      background: var(--primary-neon);
      color: var(--deep-space) !important;
      font-weight: 700;
      padding: 0.5rem 1.5rem;
      border-radius: 30px;
      box-shadow: 0 0 15px rgba(196, 255, 14, 0.5);
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
    }

    .nav-cta:hover {
      box-shadow: 0 0 30px rgba(196, 255, 14, 0.8);
      transform: translateY(-1px);
      color: var(--deep-space) !important;
    }

    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--white-matte);
      font-size: 1.6rem;
      cursor: pointer;
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-attachment: fixed;
      position: relative;
      padding: 6rem 1.5rem 4rem;
    }

    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(10,14,23,0.4) 0%, #0A0E17 95%);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-subtitle {
      font-size: 1.25rem;
      color: var(--gray-cool);
      margin-bottom: 2.5rem;
    }

    .btn-group {
      display: flex;
      gap: 1.25rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-neon);
      color: var(--deep-space);
      font-weight: 700;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-glow);
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-glow-hover);
      transform: translateY(-2px);
      color: var(--deep-space);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-lg);
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .btn-ghost:hover {
      background: rgba(0, 240, 255, 0.05);
      border-color: var(--primary-neon);
      color: var(--primary-neon);
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: var(--glass-border-hover);
      transform: translateY(-4px);
      box-shadow: 0 15px 35px rgba(0,0,0,0.5);
      background: rgba(255, 255, 255, 0.06);
    }

    .icon-neon {
      color: var(--primary-neon);
      font-size: 2.4rem;
      margin-bottom: 1.5rem;
    }

    /* 板块通用 */
    section {
      padding: 5rem 1.5rem;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
    }

    /* scenarios 图文交织 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 3rem;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .scenario-text {
      flex: 1;
    }

    /* 案例数据卡片 */
    .case-metrics {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .metric-item {
      background: rgba(255,255,255,0.02);
      border-left: 3px solid var(--primary-neon);
      padding: 1rem 1.5rem;
      border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    }
    .metric-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-neon);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      color: var(--white-matte);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      margin-top: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* 页脚表单 */
    .footer-input {
      background: rgba(255,255,255,0.05);
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.1);
      color: white;
      padding: 0.7rem;
      width: 100%;
      margin-bottom: 1rem;
    }
    .footer-input:focus {
      outline: none;
      border-bottom-color: var(--primary-neon);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10,14,23,0.95);
        flex-direction: column;
        padding: 1.5rem;
        border-radius: 20px;
        backdrop-filter: blur(20px);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
    }