/* roulang page: index */
:root {
      --deep-purple: #1E0A3C;
      --electric-orange: #FF6B35;
      --dark-blue-gray: #0F172A;
      --light-purple: #F5F0FA;
      --white-alpha: rgba(255, 255, 255, 0.06);
      --white: #FFFFFF;
      --near-black: #0F0F1A;
      --text-muted: #A78BFA;
      --neon-cyan: #00F5D4;
      --border-light: rgba(255, 255, 255, 0.1);
      --border-purple: #E2D9F3;
      --radius-xl: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --shadow-card: 0 2px 10px rgba(0,0,0,0.1);
      --shadow-glow: 0 8px 30px rgba(255,107,53,0.15);
      --transition: all 0.25s ease;
      --font-heading: 'PingFang SC', 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
      --max-width: 1280px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--deep-purple);
      color: var(--white);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
    }

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

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

    button, input {
      font-family: inherit;
      border: none;
      outline: none;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(30, 10, 60, 0.75);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      background-clip: padding-box;
      z-index: 999;
      transition: var(--transition);
    }

    .header::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: linear-gradient(90deg, var(--electric-orange), transparent);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white);
      letter-spacing: 1px;
    }

    .logo span {
      color: var(--electric-orange);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-menu a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-muted);
      transition: var(--transition);
      position: relative;
      padding: 4px 0;
    }

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

    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--electric-orange);
    }

    .cta-btn {
      background: var(--electric-orange);
      color: var(--white);
      padding: 10px 20px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.9rem;
      transition: var(--transition);
      white-space: nowrap;
      box-shadow: 0 4px 12px rgba(255,107,53,0.3);
    }

    .cta-btn:hover {
      background: #E55A2B;
      box-shadow: 0 0 18px rgba(255,107,53,0.5);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      cursor: pointer;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--white);
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(15, 5, 30, 0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        transform: translateY(-120%);
        transition: transform 0.35s ease;
        z-index: 99;
      }
      .nav-menu.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
      .nav .cta-btn {
        display: none;
      }
      .mobile-cta {
        display: block;
      }
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: linear-gradient(135deg, #1E0A3C 0%, #0F172A 100%);
      position: relative;
      overflow: hidden;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-content {
      flex: 1 1 50%;
    }

    .hero h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      background: linear-gradient(to right, var(--electric-orange), var(--neon-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 500px;
    }

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

    .btn-primary {
      background: var(--electric-orange);
      color: white;
      padding: 14px 30px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: var(--transition);
      box-shadow: 0 4px 14px rgba(255,107,53,0.4);
    }

    .btn-primary:hover {
      background: #E55A2B;
      box-shadow: 0 0 22px rgba(255,107,53,0.6);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--electric-orange);
      color: var(--electric-orange);
      padding: 14px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: var(--transition);
    }

    .btn-secondary:hover {
      background: rgba(255,107,53,0.1);
    }

    .hero-visual {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-xl);
      height: 340px;
      box-shadow: 0 0 30px rgba(255,107,53,0.25);
      position: relative;
      overflow: hidden;
    }

    .stats-row {
      display: flex;
      gap: 24px;
      margin-top: 48px;
      flex-wrap: wrap;
    }

    .stat-item {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      padding: 16px 24px;
      text-align: center;
    }

    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--neon-cyan);
      font-variant-numeric: tabular-nums;
      text-shadow: 0 0 8px rgba(0,245,212,0.5);
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 0.85rem;
      margin-top: 4px;
    }

    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-visual {
        width: 100%;
        height: 240px;
      }
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--white);
    }

    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
    }

    .bg-light {
      background-color: var(--light-purple);
    }
    .bg-light .section-title, .bg-light p {
      color: var(--near-black);
    }
    .bg-light .section-sub {
      color: #5B4A8A;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--white);
      color: var(--near-black);
      border-radius: var(--radius-xl);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-glow);
      border: 1px solid rgba(255,107,53,0.3);
    }

    .feature-icon {
      width: 52px;
      height: 52px;
      background: linear-gradient(135deg, #1E0A3C, #3A2A5C);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--neon-cyan);
      font-size: 24px;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

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

    /* 产品服务 */
    .product-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .product-row.reverse {
      flex-direction: row-reverse;
    }
    .product-text {
      flex: 1;
    }
    .product-text h3 {
      color: var(--electric-orange);
      font-size: 1.8rem;
    }
    .product-list {
      list-style: none;
      margin-top: 20px;
    }
    .product-list li {
      padding-left: 24px;
      position: relative;
      margin-bottom: 10px;
    }
    .product-list li::before {
      content: '●';
      position: absolute;
      left: 0;
      color: var(--neon-cyan);
    }
    .product-img {
      flex: 1;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-xl);
      height: 280px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }

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

    /* 案例卡片 */
    .cases-scroll {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 300px;
      background: linear-gradient(145deg, #1E0A3C, #0F172A);
      border-radius: var(--radius-xl);
      padding: 20px;
      border: 1px solid rgba(255,107,53,0.15);
      transition: var(--transition);
    }
    .case-card:hover {
      border-color: var(--electric-orange);
      box-shadow: 0 0 22px rgba(255,107,53,0.4);
      transform: scale(1.02);
    }
    .case-img {
      height: 140px;
      background-size: cover;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
    }
    .case-tag {
      background: rgba(255,107,53,0.2);
      color: var(--electric-orange);
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 0.75rem;
      display: inline-block;
    }
    .case-number {
      color: var(--neon-cyan);
      font-weight: 700;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #ccc;
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* CTA */
    .cta-banner {
      background: linear-gradient(135deg, #1E0A3C, #0F172A);
      text-align: center;
      padding: 80px 0;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      margin-top: 28px;
    }
    .cta-form input {
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      width: 280px;
      background: white;
    }
    .btn-submit {
      background: var(--neon-cyan);
      color: #0F0F1A;
      font-weight: 700;
      padding: 14px 28px;
      border-radius: var(--radius-md);
    }
    .btn-submit:hover {
      filter: brightness(1.2);
    }

    footer {
      background: #0B0320;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: #888;
    }