/* roulang page: index */
:root {
      --deep-space: #0B0D2E;
      --nebula-purple: #6C5CE7;
      --cyan-neon: #00E5FF;
      --victory-green: #00E676;
      --alert-orange: #FF6D00;
      --error-red: #FF1744;
      --text-light: #E8E8F0;
      --text-dark: #1A1A2E;
      --text-muted-light: #7B7B9A;
      --text-muted-dark: #5A5A7A;
      --card-dark-bg: #141432;
      --card-light-bg: #FFFFFF;
      --light-section-bg: #F0F0F8;
      --footer-bg: #06081C;
      --border-light: rgba(255,255,255,0.1);
      --border-dark: rgba(0,0,0,0.08);
      --shadow-purple: 0 4px 24px rgba(108,92,231,0.15);
      --shadow-white: 0 2px 12px rgba(0,0,0,0.06);
      --radius-xl: 24px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --transition: 250ms ease-out;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 1024px) {
      .container {
        padding: 0 32px;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 24px;
      }
    }
    @media (max-width: 520px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 13, 46, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
      z-index: 1000;
      padding: 0 20px;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      height: 72px;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--nebula-purple), var(--cyan-neon));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-decoration: none;
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
    }
    .nav-menu a {
      text-decoration: none;
      color: var(--text-muted-light);
      font-size: 0.95rem;
      font-weight: 500;
      transition: color var(--transition);
      position: relative;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--cyan-neon);
    }
    .nav-cta {
      background: var(--nebula-purple);
      color: white;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: background var(--transition), box-shadow var(--transition);
      font-size: 0.9rem;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: #7A6AFF;
      box-shadow: 0 0 16px rgba(108,92,231,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 6px;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 28px;
      height: 2.5px;
      background: var(--text-light);
      border-radius: 2px;
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11, 13, 46, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.8rem;
        transform: translateY(-120%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.3s ease;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
      }
      .nav-cta.desktop-only {
        display: none;
      }
    }
    @media (min-width: 1025px) {
      .nav-cta.mobile-only {
        display: none;
      }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
      line-height: 1.3;
      color: var(--text-light);
    }
    .light-bg {
      background-color: var(--light-section-bg);
      color: var(--text-dark);
    }
    .light-bg .section-title {
      color: var(--text-dark);
    }
    .light-bg .text-muted {
      color: var(--text-muted-dark);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-color: var(--deep-space);
      padding-top: 80px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      background: linear-gradient(to right, var(--nebula-purple), var(--cyan-neon));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
    }
    .hero-left .subtitle {
      font-size: 1.1rem;
      color: var(--text-muted-light);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--nebula-purple);
      color: white;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: all var(--transition);
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #7A6AFF;
      box-shadow: 0 0 18px rgba(108,92,231,0.6);
      transform: scale(0.98);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--cyan-neon);
      color: var(--cyan-neon);
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: all var(--transition);
    }
    .btn-secondary:hover {
      background: rgba(0,229,255,0.08);
    }
    .hero-right {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-xl);
      height: 480px;
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(0,229,255,0.25);
      box-shadow: 0 0 30px rgba(108,92,231,0.3);
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(108,92,231,0.2), rgba(0,229,255,0.15));
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
      }
      .hero-right {
        height: 350px;
      }
    }

    /* about */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .about-img {
      background: url('/assets/images/backpic/back-2.webp') center/cover;
      border-radius: var(--radius-lg);
      height: 380px;
    }
    .stats {
      display: flex;
      gap: 2rem;
      margin-top: 1.5rem;
    }
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--cyan-neon);
    }
    @media (max-width: 768px) {
      .about-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 生态卡片 */
    .ecosystem-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .eco-card {
      background: var(--card-dark-bg);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      transition: all var(--transition);
      border: 1px solid transparent;
    }
    .eco-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 32px rgba(108,92,231,0.25);
      border-color: rgba(0,229,255,0.2);
    }
    .eco-icon {
      font-size: 2.5rem;
      color: var(--nebula-purple);
      margin-bottom: 1rem;
    }
    @media (max-width: 768px) {
      .ecosystem-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布流 */
    .cases-masonry {
      columns: 2;
      gap: 20px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 20px;
      background: var(--card-dark-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 28px rgba(108,92,231,0.3);
    }
    .case-img {
      width: 100%;
      height: auto;
      aspect-ratio: 16/10;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 1.2rem;
    }
    .tag {
      background: var(--alert-orange);
      color: white;
      font-size: 0.75rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      display: inline-block;
    }
    @media (max-width: 768px) {
      .cases-masonry {
        columns: 1;
      }
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr 1fr;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-white);
    }
    .table-col {
      padding: 1.5rem;
    }
    .highlight-col {
      background: rgba(108,92,231,0.07);
      border-left: 2px solid var(--nebula-purple);
      position: relative;
    }
    .badge-recommend {
      background: var(--nebula-purple);
      color: white;
      font-size: 0.7rem;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      position: absolute;
      top: 10px;
      right: 10px;
    }
    @media (max-width: 768px) {
      .compare-table {
        grid-template-columns: 1fr;
        overflow-x: auto;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.08);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted-dark);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 0.8rem;
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      background: var(--card-dark-bg);
      border: 1px solid #2A2A4A;
      border-radius: var(--radius-sm);
      padding: 0.9rem;
      color: white;
      margin-bottom: 1rem;
      transition: 0.2s;
    }
    .contact-form input:focus {
      border-color: var(--cyan-neon);
      box-shadow: 0 0 0 3px rgba(0,229,255,0.2);
      outline: none;
    }
    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 页脚 */
    .footer {
      background: var(--footer-bg);
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
    }
    .footer-bottom {
      text-align: center;
      margin-top: 2rem;
      font-size: 0.8rem;
      color: var(--text-muted-light);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }