/* roulang page: index */
:root {
      --primary-neon: #C84BFF;
      --secondary-cyan: #00F0FF;
      --deep-bg: #1A1A2E;
      --darker-bg: #0F0F1A;
      --footer-bg: #0A0A12;
      --white: #FFFFFF;
      --gray-cool: #B0B0C0;
      --green-neon: #00E676;
      --red-neon: #FF3D5A;
      --border-glow: rgba(200, 75, 255, 0.15);
      --card-shadow: 0 4px 24px rgba(200, 75, 255, 0.08);
      --card-hover-shadow: 0 8px 32px rgba(200, 75, 255, 0.2);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --transition-smooth: 0.25s ease;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-display: "Inter", "SF Pro Display", system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--deep-bg);
      color: #E0E0F0;
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 25% 25%, rgba(200, 75, 255, 0.03) 0%, transparent 50%),
                        radial-gradient(circle at 75% 75%, rgba(0, 240, 255, 0.03) 0%, transparent 50%);
      position: relative;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: repeating-linear-gradient(0deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px, transparent 1px, transparent 40px),
                        repeating-linear-gradient(90deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px, transparent 1px, transparent 40px);
      pointer-events: none;
      z-index: 0;
    }

    .container-main {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-display);
      color: var(--white);
      font-weight: 600;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      font-weight: 700;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      letter-spacing: -0.3px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }

    p, .desc-text {
      color: #E0E0F0;
      font-size: 16px;
      line-height: 1.7;
    }

    .small-text {
      font-size: 13px;
      line-height: 1.6;
      color: var(--gray-cool);
    }

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

    a:hover {
      color: var(--primary-neon);
    }

    /* 导航 */
    .header-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10, 10, 18, 0.92);
      backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      z-index: 100;
      border-bottom: 1px solid rgba(200, 75, 255, 0.15);
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-text {
      font-size: 24px;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 1px;
      position: relative;
    }

    .logo-text::before {
      content: '';
      position: absolute;
      left: -12px;
      top: 50%;
      transform: translateY(-50%);
      width: 3px;
      height: 18px;
      background: var(--primary-neon);
      box-shadow: 0 0 12px var(--primary-neon);
      border-radius: 2px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      margin: 0;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--gray-cool);
      padding: 4px 0;
      position: relative;
      transition: color 0.3s;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-neon);
      box-shadow: 0 0 10px var(--primary-neon);
      transition: width 0.3s ease;
    }

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

    .btn-nav {
      background: var(--primary-neon);
      color: white;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: all var(--transition-smooth);
      border: none;
      cursor: pointer;
    }

    .btn-nav:hover {
      background: #D06FFF;
      box-shadow: 0 0 20px rgba(200, 75, 255, 0.6);
      color: white;
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      cursor: pointer;
    }

    @media (max-width: 840px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .header-nav {
        padding: 0 24px;
      }
    }

    /* Hero */
    #home {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      padding-top: 64px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      width: 100%;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-glow {
      width: 350px;
      height: 350px;
      background: radial-gradient(circle, rgba(200,75,255,0.25) 0%, rgba(0,240,255,0.1) 40%, transparent 70%);
      border-radius: 50%;
      filter: blur(40px);
      animation: breath 8s ease-in-out infinite;
      position: relative;
    }

    @keyframes breath {
      0% { transform: scale(1); opacity: 0.7; }
      50% { transform: scale(1.1); opacity: 1; }
      100% { transform: scale(1); opacity: 0.7; }
    }

    .hero-title {
      font-size: 48px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: #C0C0D0;
      margin-bottom: 32px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-neon);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: all var(--transition-smooth);
      box-shadow: 0 0 16px rgba(200,75,255,0.4);
      cursor: pointer;
      font-size: 16px;
    }

    .btn-primary:hover {
      background: #D06FFF;
      box-shadow: 0 0 28px rgba(200,75,255,0.7);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary-neon);
      color: var(--primary-neon);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition-smooth);
      cursor: pointer;
      font-size: 16px;
    }

    .btn-secondary:hover {
      background: rgba(200,75,255,0.1);
      border-color: var(--secondary-cyan);
      color: var(--secondary-cyan);
    }

    @media (max-width: 840px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-title {
        font-size: 36px;
      }
      .hero-right {
        margin-top: 30px;
      }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
      z-index: 2;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    /* 优势 2x2 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .feature-card {
      background: rgba(15,15,26,0.7);
      backdrop-filter: blur(4px);
      padding: 32px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-glow);
      transition: all var(--transition-smooth);
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
      border-color: var(--primary-neon);
    }

    .feature-icon {
      font-size: 32px;
      color: var(--primary-neon);
      margin-bottom: 16px;
    }

    @media (max-width: 640px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 产品卡片 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .product-card {
      background: var(--darker-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(200,75,255,0.1);
      transition: all var(--transition-smooth);
    }

    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(200,75,255,0.25);
      border-color: var(--primary-neon);
    }

    .product-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .product-body {
      padding: 24px;
    }

    .tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin: 12px 0;
    }

    .tag {
      background: rgba(200,75,255,0.15);
      color: var(--primary-neon);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
    }

    @media (max-width: 1024px) {
      .products-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .products-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景交错 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }

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

    .scenario-img {
      flex: 1;
      height: 280px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
      transition: transform 0.3s;
    }

    .scenario-img:hover {
      transform: scale(1.02);
    }

    .scenario-text {
      flex: 1;
    }

    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--secondary-cyan);
      margin-top: 12px;
    }

    @media (max-width: 768px) {
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: #16162A;
      padding: 28px;
      border-radius: var(--radius-card);
      border-left: 3px solid transparent;
      transition: all 0.3s;
    }

    .case-card:hover {
      border-left: 3px solid var(--primary-neon);
      box-shadow: var(--card-hover-shadow);
    }

    .client-logo {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      border: 2px solid var(--primary-neon);
      background: rgba(200,75,255,0.2);
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .faq-question {
      padding: 20px 0;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--gray-cool);
    }

    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 16px;
    }

    /* 联系 */
    #contact {
      background: linear-gradient(180deg, #0F0F1A 0%, #1A1A2E 100%);
    }

    .contact-form {
      max-width: 600px;
      margin: 0 auto;
    }

    input, textarea {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-btn);
      padding: 14px;
      color: white;
      width: 100%;
      margin-bottom: 16px;
      transition: 0.2s;
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: var(--primary-neon);
      box-shadow: 0 0 10px rgba(200,75,255,0.3);
    }

    /* 页脚 */
    footer {
      background: var(--footer-bg);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
    }