/* roulang page: index */
:root {
      --primary: #D42FFF;
      --primary-dark: #B026FF;
      --accent: #00F0FF;
      --bg-deep: #0A0E17;
      --bg-card: #111827;
      --bg-section: #1A1F2E;
      --text-primary: #FFFFFF;
      --text-body: #B0B8C5;
      --text-muted: #6B7280;
      --border-light: rgba(255,255,255,0.08);
      --border-glow: rgba(0,240,255,0.3);
      --gradient-btn: linear-gradient(135deg, #D42FFF 0%, #00F0FF 100%);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 20px rgba(212,47,255,0.35);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-pill: 50px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, input, textarea {
      font-family: inherit;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10,14,23,0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      transition: background 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-primary);
      letter-spacing: -0.02em;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--gradient-btn);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
      font-size: 0.95rem;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      box-shadow: 0 0 10px var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--gradient-btn);
      color: white;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      box-shadow: 0 4px 15px rgba(212,47,255,0.3);
      transition: var(--transition-smooth);
      white-space: nowrap;
    }
    .btn-nav:hover {
      transform: scale(1.03);
      box-shadow: 0 6px 25px rgba(0,240,255,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.3s;
      display: block;
    }
    /* 移动端导航 */
    @media (max-width: 1024px) {
      .nav-links {
        position: fixed;
        top: 72px;
        right: 0;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(10,14,23,0.95);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 40px 30px;
        gap: 28px;
        transform: translateX(100%);
        transition: transform 0.35s ease;
        box-shadow: -10px 0 30px rgba(0,0,0,0.5);
        align-items: flex-start;
      }
      .nav-links.active {
        transform: translateX(0);
      }
      .hamburger {
        display: flex;
      }
      .btn-nav {
        display: none;
      }
      .nav-container .btn-nav-mobile {
        display: block;
        margin-top: 20px;
        width: 100%;
        text-align: center;
        background: var(--gradient-btn);
        color: white;
        padding: 12px 20px;
        border-radius: var(--radius-sm);
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
      .container {
        padding: 0 20px;
      }
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--text-primary);
      letter-spacing: -0.02em;
      margin-bottom: 16px;
      line-height: 1.2;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, #1a1030 0%, #0A0E17 80%);
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      filter: brightness(0.7) saturate(1.2);
      z-index: 0;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.15;
      background: linear-gradient(to right, #D42FFF, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }
    .hero-content p {
      font-size: 1.25rem;
      color: #CBD5E1;
      margin-bottom: 36px;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gradient-btn);
      border: none;
      padding: 14px 34px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      color: white;
      box-shadow: 0 4px 20px rgba(212,47,255,0.5);
      cursor: pointer;
      transition: var(--transition-smooth);
      font-size: 1rem;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 8px 30px rgba(0,240,255,0.6);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      padding: 14px 34px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
      backdrop-filter: blur(8px);
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      box-shadow: 0 0 18px rgba(0,240,255,0.4);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-2.webp') center/cover;
      border-radius: 24px;
      height: 380px;
      box-shadow: 0 0 40px rgba(212,47,255,0.2);
      border: 1px solid rgba(255,255,255,0.1);
    }
    @media (max-width: 1024px) {
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 2.8rem;
      }
      .hero-image {
        height: 280px;
        order: -1;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .feature-item {
      background: rgba(17,24,39,0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 20px;
      text-align: center;
      transition: var(--transition-smooth);
    }
    .feature-item:hover {
      border-color: var(--border-glow);
      box-shadow: 0 8px 30px rgba(212,47,255,0.15);
      transform: translateY(-5px);
    }
    .feature-icon {
      font-size: 2.5rem;
      margin-bottom: 18px;
    }
    .feature-item h3 {
      color: var(--text-primary);
      font-weight: 700;
      margin-bottom: 10px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 520px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: rgba(17,24,39,0.65);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: var(--transition-smooth);
    }
    .service-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-10px);
      box-shadow: 0 15px 35px rgba(0,0,0,0.5);
    }
    .service-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 18px;
    }
    .tag {
      background: rgba(0,240,255,0.08);
      border: 1px solid rgba(0,240,255,0.25);
      color: var(--accent);
      padding: 4px 14px;
      border-radius: 50px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据看板 */
    #stats {
      background: #0d1220;
      background-image: radial-gradient(circle at 20% 30%, #1f1b33 0%, transparent 40%);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      background: linear-gradient(to right, #D42FFF, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    @media (max-width: 640px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .case-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-md);
      border: 1px solid rgba(255,255,255,0.05);
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    .case-card:hover {
      border-color: var(--accent);
      box-shadow: 0 0 25px rgba(0,240,255,0.25);
    }
    .case-img {
      height: 160px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 18px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-num {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(135deg, #D42FFF, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    @media (max-width: 640px) {
      .process-steps {
        flex-direction: column;
        gap: 30px;
      }
    }
    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.02);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.1rem;
      color: white;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
    }
    /* 联系表单 */
    .contact-form input, .contact-form textarea {
      width: 100%;
      background: rgba(10,14,23,0.7);
      border: 1px solid rgba(255,255,255,0.1);
      padding: 14px;
      border-radius: var(--radius-sm);
      color: white;
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .contact-form input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
      outline: none;
    }
    footer {
      background: #060A10;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(212,47,255,0.2);
    }