/* roulang page: index */
/* 全局设计令牌与重置 */
    :root {
      --primary: #00F0FF;
      --secondary: #BD00FF;
      --accent: #FF3366;
      --bg-deep: #06080D;
      --bg-card: rgba(255, 255, 255, 0.03);
      --surface-glass: rgba(255, 255, 255, 0.05);
      --border-glass: rgba(255, 255, 255, 0.1);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.4);
      --font-brand: 'Orbitron', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --radius-xl: 24px;
      --radius-lg: 16px;
      --radius-full: 50px;
      --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.2);
      --shadow-card: 0 8px 32px rgba(0, 240, 255, 0.15);
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 流体排版 */
    h1 {
      font-size: clamp(3rem, 8vw, 6rem);
      font-weight: 900;
      line-height: 1.1;
      letter-spacing: -0.02em;
    }

    h2 {
      font-size: clamp(2rem, 5vw, 3.5rem);
      font-weight: 700;
      letter-spacing: -0.01em;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: clamp(1.25rem, 3vw, 1.75rem);
      font-weight: 600;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
      position: relative;
      display: inline-block;
      left: 50%;
      transform: translateX(-50%);
      white-space: nowrap;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -12px;
      left: 0;
      width: 100%;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      border-radius: 4px;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
    }

    /* 导航栏 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      z-index: 1000;
      transition: var(--transition-smooth);
      background: transparent;
      backdrop-filter: blur(0px);
      border-bottom: 1px solid transparent;
    }

    .nav.scrolled {
      background: rgba(6, 8, 13, 0.8);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.3);
      box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    }

    .nav-brand {
      font-family: var(--font-brand);
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 2px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-primary);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition-smooth);
      text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
      box-shadow: 0 0 10px var(--primary);
    }

    .nav-links a:hover {
      color: var(--primary);
      text-shadow: 0 0 20px var(--primary);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 2rem;
      cursor: pointer;
      z-index: 1001;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(6, 8, 13, 0.95);
        backdrop-filter: blur(25px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        transform: translateX(100%);
        transition: transform 0.4s ease;
      }
      .nav-links.active {
        transform: translateX(0);
      }
      .nav-links a {
        font-size: 1.8rem;
      }
      .menu-toggle {
        display: block;
      }
      .nav {
        padding: 0 24px;
      }
    }

    /* 首屏 Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(6, 8, 13, 0.7);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
    }

    .hero h1 {
      font-family: var(--font-brand);
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
      filter: drop-shadow(0 0 25px rgba(0, 240, 255, 0.5));
    }

    .hero-sub {
      font-size: clamp(1.1rem, 2.5vw, 1.5rem);
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
      font-weight: 400;
    }

    .btn-group {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn {
      padding: 14px 40px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 1.1rem;
      text-decoration: none;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.6);
    }

    .btn-primary:hover {
      box-shadow: 0 0 45px rgba(0, 240, 255, 0.9);
      transform: scale(1.05);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
    }

    .btn-ghost:hover {
      background: rgba(0, 240, 255, 0.1);
      color: #fff;
      box-shadow: 0 0 30px var(--primary);
    }

    .kpi-float {
      margin-top: 4rem;
      background: var(--surface-glass);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      padding: 1.5rem 2.5rem;
      display: inline-flex;
      align-items: center;
      gap: 2rem;
      box-shadow: var(--shadow-glow);
    }

    .kpi-number {
      font-family: var(--font-brand);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
      text-shadow: 0 0 20px var(--primary);
    }

    /* 通用板块 */
    section {
      padding: 120px 0;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .glass-card {
      background: var(--surface-glass);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.5);
      box-shadow: var(--shadow-card);
      transform: translateY(-8px);
    }

    /* 服务矩阵非对称 */
    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 1.8rem;
    }

    .service-featured {
      grid-row: span 2;
      background: rgba(0, 240, 255, 0.08);
      border-color: rgba(0, 240, 255, 0.4);
    }

    /* 性能对比 */
    .compare-container {
      display: flex;
      gap: 2rem;
      align-items: stretch;
    }

    .compare-col {
      flex: 1;
      background: var(--surface-glass);
      backdrop-filter: blur(15px);
      border-radius: var(--radius-lg);
      padding: 2rem;
      border: 1px solid var(--border-glass);
    }

    .bar-item {
      margin: 1.8rem 0;
    }

    .bar-label {
      display: flex;
      justify-content: space-between;
      margin-bottom: 0.5rem;
      font-weight: 500;
    }

    .bar-track {
      height: 10px;
      background: rgba(255,255,255,0.1);
      border-radius: 10px;
      overflow: hidden;
    }

    .bar-fill {
      height: 100%;
      background: var(--primary);
      box-shadow: 0 0 15px var(--primary);
      border-radius: 10px;
      width: 0%;
    }

    .bar-fill.secondary {
      background: rgba(255,255,255,0.25);
      box-shadow: none;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-glass);
      padding: 1.5rem 0;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 1.2rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      padding-top: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 1rem;
    }

    /* 表单 */
    .cta-card {
      background: var(--surface-glass);
      backdrop-filter: blur(25px);
      border: 1px solid rgba(0, 240, 255, 0.3);
      border-radius: var(--radius-xl);
      padding: 3rem;
      text-align: center;
      max-width: 700px;
      margin: 0 auto;
    }

    .input-group {
      display: flex;
      gap: 1rem;
      margin-top: 2rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .input-field {
      background: rgba(255,255,255,0.08);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-full);
      padding: 14px 24px;
      color: #fff;
      font-size: 1rem;
      min-width: 260px;
    }

    .btn-submit {
      background: var(--primary);
      border: none;
      padding: 14px 35px;
      border-radius: var(--radius-full);
      font-weight: 700;
      color: #000;
      cursor: pointer;
      box-shadow: 0 0 25px var(--primary);
      transition: 0.3s;
    }

    .btn-submit:hover {
      box-shadow: 0 0 50px var(--primary);
      transform: scale(1.05);
    }

    footer {
      background: #03050A;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(0, 240, 255, 0.2);
    }

    @media (max-width: 1024px) {
      .grid-3, .service-grid {
        grid-template-columns: 1fr 1fr;
      }
      .compare-container {
        flex-direction: column;
      }
    }

    @media (max-width: 768px) {
      .grid-3, .service-grid {
        grid-template-columns: 1fr;
      }
      .section-title {
        white-space: normal;
        left: 0;
        transform: none;
        text-align: center;
        width: 100%;
      }
    }