/* roulang page: index */
/* ----- 设计变量 & 全局重置 ----- */
    :root {
      --primary-neon: #00FFA3;
      --secondary-purple: #2D00F7;
      --accent-orange: #FF4D00;
      --bg-deep: #0A0A0F;
      --bg-panel: #1A1A24;
      --text-white: #FFFFFF;
      --text-gray: #B0B5C0;
      --border-dim: rgba(0, 255, 163, 0.15);
      --border-active: rgba(0, 255, 163, 0.7);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'DIN Alternate', 'Roboto Mono', monospace;
      --spacing-xs: 8px;
      --spacing-sm: 16px;
      --spacing-md: 24px;
      --spacing-lg: 48px;
      --spacing-xl: 80px;
      --spacing-2xl: 120px;
      --radius-sharp: 2px;
      --transition-fast: 0.2s ease;
      --transition-smooth: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-white);
      font-family: var(--font-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 var(--spacing-md);
    }

    /* 排版 */
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: clamp(42px, 6vw, 64px);
      line-height: 1.15;
      text-shadow: 0 0 30px rgba(0, 255, 163, 0.4);
    }

    h2 {
      font-size: clamp(32px, 5vw, 48px);
      margin-bottom: var(--spacing-md);
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60%;
      height: 3px;
      background: var(--primary-neon);
      box-shadow: 0 0 12px var(--primary-neon);
    }

    h3 {
      font-size: 24px;
      font-weight: 700;
    }

    p {
      color: var(--text-gray);
      font-size: 1.05rem;
    }

    a {
      color: var(--primary-neon);
      text-decoration: none;
      transition: var(--transition-fast);
    }

    a:hover {
      text-shadow: 0 0 8px var(--primary-neon);
    }

    /* 按钮组件 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 0.03em;
      border-radius: var(--radius-sharp);
      transition: all var(--transition-smooth);
      cursor: pointer;
      text-transform: uppercase;
      border: 2px solid transparent;
      background: transparent;
      font-family: var(--font-heading);
      gap: 8px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-neon), #00cc7a);
      color: #0A0A0F;
      border: none;
      box-shadow: 0 4px 20px rgba(0, 255, 163, 0.4);
    }

    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0, 255, 163, 0.8);
      transform: translateY(-2px);
      background: var(--primary-neon);
    }

    .btn-outline {
      border: 2px solid var(--primary-neon);
      color: var(--primary-neon);
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(0, 255, 163, 0.08);
      box-shadow: 0 0 18px rgba(0, 255, 163, 0.5);
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 10, 15, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-dim);
      z-index: 1000;
      padding: 12px 0;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 var(--spacing-md);
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 900;
      font-size: 1.8rem;
      background: linear-gradient(to right, var(--primary-neon), #a0ffd0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }

    .logo i {
      background: none;
      -webkit-text-fill-color: var(--primary-neon);
      font-size: 2rem;
    }

    .nav-menu {
      display: flex;
      gap: 36px;
      list-style: none;
    }

    .nav-menu a {
      color: var(--text-gray);
      font-weight: 600;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-neon);
      box-shadow: 0 0 10px var(--primary-neon);
      transition: width var(--transition-smooth);
    }

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

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-neon);
      cursor: pointer;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(10, 10, 15, 0.96);
        backdrop-filter: blur(30px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.4s ease;
        gap: 48px;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .logo {
        font-size: 1.4rem;
      }
    }

    /* 首屏 Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(10, 10, 15, 0.75);
      position: relative;
      margin-top: 0;
      padding-top: 80px;
    }

    .hero-content {
      max-width: 800px;
      margin-top: -40px;
    }

    .hero h1 span {
      color: var(--primary-neon);
    }

    .hero p {
      font-size: 1.3rem;
      margin: 24px 0 40px;
      color: #d0d5dd;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* 通用板块 */
    section {
      padding: var(--spacing-2xl) 0;
    }

    .section-header {
      margin-bottom: var(--spacing-xl);
    }

    /* 核心服务 1+2 布局 */
    .services-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }

    .service-card {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-sharp);
      padding: var(--spacing-lg);
      transition: all var(--transition-smooth);
      position: relative;
      overflow: hidden;
    }

    .service-card:hover {
      border-color: var(--border-active);
      box-shadow: 0 0 25px rgba(0, 255, 163, 0.15);
    }

    .service-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--primary-neon), transparent);
      transition: left 0.6s ease;
    }

    .service-card:hover::before {
      left: 100%;
    }

    .large-card {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .score-stream {
      font-family: var(--font-mono);
      font-size: 1.9rem;
      color: var(--primary-neon);
      margin: 16px 0;
    }

    /* 数据看板 */
    .stats-panel {
      background: rgba(26, 26, 36, 0.7);
      border: 1px solid var(--border-dim);
      padding: var(--spacing-xl);
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
      backdrop-filter: blur(10px);
    }

    .stat-item {
      font-family: var(--font-mono);
    }

    .stat-number {
      font-size: 4rem;
      font-weight: 700;
      color: var(--primary-neon);
      text-shadow: 0 0 20px rgba(0,255,163,0.6);
    }

    /* 特色功能图文 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: var(--spacing-2xl);
    }

    .feature-row.reverse {
      flex-direction: row-reverse;
    }

    .feature-img {
      flex: 1;
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-sharp);
      overflow: hidden;
    }

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

    .feature-text {
      flex: 1;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-dim);
      padding: var(--spacing-md) 0;
    }

    .faq-question {
      font-weight: 700;
      font-size: 1.2rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-white);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-gray);
      margin-top: 8px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0f0f1a, #1a1025);
      border: 1px solid var(--border-active);
      padding: var(--spacing-2xl) var(--spacing-md);
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: #05050a;
      padding: var(--spacing-xl) 0;
      text-align: center;
      border-top: 1px solid var(--border-dim);
    }

    .footer-logo {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary-neon);
      margin-bottom: 16px;
    }

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .feature-row {
        flex-direction: column;
      }
      .feature-row.reverse {
        flex-direction: column;
      }
      .stat-number {
        font-size: 2.8rem;
      }
    }