/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --midnight-purple: #1A0A2E;
      --electric-cyan: #00E5FF;
      --electric-cyan-hover: #33EAFF;
      --compete-orange: #FF6B35;
      --compete-orange-hover: #FF8A5C;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-bg: rgba(255, 255, 255, 0.06);
      --glass-hover-border: rgba(0, 229, 255, 0.3);
      --text-primary: #E0E6F0;
      --text-secondary: #8892B0;
      --text-dark: #0A0E27;
      --success: #00C853;
      --radius-sm: 10px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-xl: 28px;
      --radius-full: 50%;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
      --shadow-glow-cyan: 0 0 30px rgba(0, 229, 255, 0.4);
      --shadow-glow-orange: 0 0 30px rgba(255, 107, 53, 0.4);
      --spacing-section: 120px;
      --max-width: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 玻璃拟态卡片系统 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      background: var(--glass-hover-bg);
      border-color: var(--glass-hover-border);
      box-shadow: 0 20px 40px rgba(0, 229, 255, 0.15);
      transform: translateY(-4px);
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-md);
      padding: 14px 36px;
      font-size: 16px;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
      letter-spacing: 0.5px;
    }

    .btn-primary {
      background: var(--electric-cyan);
      color: var(--text-dark);
      box-shadow: var(--shadow-glow-cyan);
    }

    .btn-primary:hover {
      background: var(--electric-cyan-hover);
      box-shadow: 0 0 50px rgba(0, 229, 255, 0.6);
      transform: scale(1.03);
    }

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

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
    }

    .btn-cta {
      background: var(--compete-orange);
      color: white;
      box-shadow: var(--shadow-glow-orange);
      padding: 18px 48px;
      font-size: 18px;
    }

    .btn-cta:hover {
      background: var(--compete-orange-hover);
      box-shadow: 0 0 45px rgba(255, 107, 53, 0.7);
      transform: scale(1.03);
    }

    .btn-white {
      background: white;
      color: var(--compete-orange);
      font-weight: 700;
    }
    .btn-white:hover {
      background: #f0f0f0;
      transform: scale(1.03);
    }

    /* 导航 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--electric-cyan);
    }

    .nav-menu {
      display: flex;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      color: var(--text-secondary);
      font-weight: 400;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--electric-cyan);
      border-bottom-color: var(--electric-cyan);
    }

    .mobile-bottom-nav {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: linear-gradient(135deg, var(--deep-blue) 0%, var(--midnight-purple) 100%);
      overflow: hidden;
      padding-top: var(--header-height);
    }

    #particle-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }

    .hero-card {
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-xl);
      padding: 60px 48px;
      max-width: 720px;
      text-align: center;
      z-index: 2;
      margin: 0 24px;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: white;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

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

    .section-title {
      font-size: 40px;
      font-weight: 600;
      line-height: 1.3;
      text-align: center;
      margin-bottom: 64px;
      color: white;
    }

    /* 痛点区 */
    .pain-grid {
      display: flex;
      flex-direction: column;
      gap: 80px;
    }
    .pain-item {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .pain-item.reverse {
      flex-direction: row-reverse;
    }
    .pain-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--glass-border);
      box-shadow: 0 0 25px rgba(0,229,255,0.2);
    }
    .pain-text {
      flex: 1;
    }
    .pain-text h3 {
      font-size: 28px;
      margin-bottom: 16px;
      color: white;
    }

    /* 解决方案卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-icon {
      font-size: 40px;
      color: var(--electric-cyan);
      margin-bottom: 20px;
    }

    /* 核心优势 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 48px;
      font-weight: 700;
      color: var(--compete-orange);
    }

    /* 成果展示 */
    .works-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .work-card img {
      border-radius: 12px;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .work-card:hover img {
      transform: scale(1.03);
    }

    /* 证言轮播 */
    .testimonial-slider {
      display: flex;
      gap: 32px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .testimonial-card {
      max-width: 380px;
      text-align: center;
    }
    .avatar {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: var(--glass-bg);
      border: 2px solid var(--electric-cyan);
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 30px;
      color: var(--electric-cyan);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-left: 3px solid transparent;
      padding: 16px 24px;
      background: var(--glass-bg);
      border-radius: var(--radius-md);
      transition: 0.3s;
      cursor: pointer;
    }
    .faq-item.active {
      border-left-color: var(--electric-cyan);
      background: rgba(0,229,255,0.05);
    }

    /* 终极CTA */
    .cta-section {
      background: linear-gradient(135deg, var(--compete-orange), #8A2BE2);
      padding: 100px 0;
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: #060B1F;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .cards-grid, .works-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .pain-item { flex-direction: column; gap: 30px; }
      .pain-item.reverse { flex-direction: column; }
    }

    @media (max-width: 768px) {
      :root { --spacing-section: 80px; }
      .desktop-nav .nav-menu, .desktop-nav .btn { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 16px;
        right: 16px;
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(20px);
        border-radius: 24px;
        padding: 12px 20px;
        justify-content: space-around;
        z-index: 1000;
        border: 1px solid rgba(255,255,255,0.1);
      }
      .mobile-bottom-nav a {
        color: var(--text-secondary);
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 12px;
      }
      .mobile-bottom-nav a.active { color: var(--electric-cyan); }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 28px; }
      .cards-grid, .works-grid, .stats-grid, .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-card { padding: 40px 24px; }
    }