/* roulang page: index */
/* ----- 设计令牌与基础重置 ----- */
    :root {
      --deep-green: #0A1C1A;
      --near-black: #020504;
      --energy-cyan: #00F0FF;
      --energy-green: #00E676;
      --white: #FFFFFF;
      --white-70: rgba(255, 255, 255, 0.7);
      --white-50: rgba(255, 255, 255, 0.5);
      --white-10: rgba(255, 255, 255, 0.1);
      --white-04: rgba(255, 255, 255, 0.04);
      --white-08: rgba(255, 255, 255, 0.08);
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --neon-glow: 0 0 15px rgba(0, 240, 255, 0.4);
      --text-shadow-neon: 0 0 10px rgba(0, 240, 255, 0.5);
      --radius-lg: 24px;
      --radius-full: 50px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background: linear-gradient(160deg, var(--deep-green) 0%, var(--near-black) 100%);
      color: var(--white);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      font-size: inherit;
    }

    /* ----- 工具类 ----- */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px) saturate(180%);
      -webkit-backdrop-filter: blur(12px) saturate(180%);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      transition: var(--transition);
    }

    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.25);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 240, 255, 0.2);
      transform: translateY(-5px);
    }

    .neon-text {
      color: var(--energy-cyan);
      text-shadow: var(--text-shadow-neon);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--energy-cyan), var(--energy-green));
      color: #000000;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-full);
      box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
      display: inline-block;
      text-align: center;
      transition: var(--transition);
      border: none;
      letter-spacing: 0.5px;
      font-size: 1rem;
    }

    .btn-primary:hover {
      box-shadow: 0 6px 22px rgba(0, 240, 255, 0.5);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(0, 240, 255, 0.4);
      color: var(--energy-cyan);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-full);
      display: inline-block;
      text-align: center;
      transition: var(--transition);
      font-size: 1rem;
    }

    .btn-ghost:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: var(--energy-cyan);
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 16px;
      letter-spacing: -0.3px;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 80px;
      height: 2px;
      background: var(--energy-cyan);
      box-shadow: 0 0 10px var(--energy-cyan);
    }

    /* ----- 导航栏 ----- */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 28, 26, 0.85);
      backdrop-filter: blur(15px);
      -webkit-backdrop-filter: blur(15px);
      z-index: 1000;
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.1);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: radial-gradient(circle, var(--energy-cyan), transparent 70%);
      border-radius: 50%;
      box-shadow: 0 0 15px var(--energy-cyan);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--white-70);
      font-weight: 500;
      transition: var(--transition);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--energy-cyan);
      text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--energy-cyan);
      box-shadow: 0 0 12px var(--energy-cyan);
      transition: width 0.3s;
    }

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

    .nav-cta {
      margin-left: 16px;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--white);
      transition: var(--transition);
      box-shadow: 0 0 6px var(--energy-cyan);
    }

    /* ----- 区块通用 ----- */
    section {
      padding: 90px 0;
    }

    /* ----- Hero ----- */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') no-repeat center center/cover;
      background-blend-mode: overlay;
      background-color: rgba(2, 5, 4, 0.7);
      position: relative;
      margin-top: 72px;
    }

    .hero .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
    }

    .hero-content {
      flex: 1 1 500px;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: var(--white);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--white-70);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-visual img {
      max-width: 90%;
      border-radius: var(--radius-lg);
      box-shadow: 0 0 40px rgba(0, 240, 255, 0.25);
    }

    /* ----- 服务卡片 ----- */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 48px;
    }

    .service-card {
      padding: 36px 28px;
      text-align: left;
    }

    .service-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 24px;
      border-radius: 18px;
      background: rgba(0, 240, 255, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .service-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

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

    .service-card p {
      color: var(--white-70);
      font-size: 0.95rem;
    }

    /* ----- 数据指标 ----- */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      margin-top: 40px;
      text-align: center;
    }

    .stat-item {
      padding: 24px;
    }

    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--energy-cyan);
      text-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
      margin-bottom: 8px;
    }

    .stat-label {
      color: var(--white-70);
      font-size: 0.95rem;
    }

    /* ----- 案例网格 ----- */
    .cases-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 30px;
      margin-top: 48px;
    }

    .case-card {
      overflow: hidden;
      padding: 0;
      display: flex;
      flex-direction: column;
    }

    .case-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
    }

    .case-info {
      padding: 24px;
    }

    .case-tag {
      display: inline-block;
      background: rgba(0, 240, 255, 0.15);
      color: var(--energy-cyan);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-bottom: 10px;
    }

    .case-card h3 {
      margin-bottom: 8px;
    }

    /* ----- 流程时间轴 ----- */
    .timeline {
      margin-top: 50px;
      position: relative;
      padding-left: 40px;
    }

    .timeline::before {
      content: '';
      position: absolute;
      left: 18px;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, var(--energy-cyan), transparent);
      box-shadow: 0 0 15px var(--energy-cyan);
    }

    .timeline-item {
      display: flex;
      gap: 30px;
      margin-bottom: 50px;
      position: relative;
    }

    .timeline-marker {
      width: 16px;
      height: 16px;
      background: var(--energy-cyan);
      border-radius: 50%;
      box-shadow: 0 0 20px var(--energy-cyan);
      position: absolute;
      left: -36px;
      top: 8px;
    }

    .timeline-content {
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--glass-border);
      border-radius: 20px;
      padding: 28px;
      flex: 1;
    }

    .timeline-content h3 {
      margin-bottom: 8px;
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-list {
      margin-top: 40px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--glass-border);
      border-radius: 20px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      color: var(--white);
      font-weight: 600;
      font-size: 1.1rem;
    }

    .faq-icon {
      font-size: 1.5rem;
      color: var(--energy-cyan);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s;
      padding: 0 24px;
      color: var(--white-70);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 0 24px 24px;
    }

    /* ----- CTA 区块 ----- */
    .cta-band {
      background: rgba(2, 5, 4, 0.9);
      padding: 80px 0;
      text-align: center;
      border-top: 1px solid rgba(0, 240, 255, 0.2);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
    }

    .cta-band h2 {
      font-size: 2.4rem;
      margin-bottom: 16px;
    }

    /* ----- 页脚 ----- */
    .footer {
      background: var(--near-black);
      padding: 60px 0 30px;
      border-top: 1px solid rgba(0, 240, 255, 0.2);
    }

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

    .footer-brand p {
      color: var(--white-50);
      margin-top: 16px;
    }

    .footer h4 {
      margin-bottom: 20px;
      color: var(--white);
    }

    .footer a {
      color: var(--white-50);
      display: block;
      margin-bottom: 10px;
      transition: color 0.2s;
    }

    .footer a:hover {
      color: var(--energy-cyan);
    }

    .footer-bottom {
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,0.05);
      text-align: center;
      color: var(--white-50);
      font-size: 0.9rem;
    }

    /* ----- 响应式 ----- */
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.4rem; }
      .section-title { font-size: 1.8rem; }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero .container { flex-direction: column; }
    }

    @media (max-width: 520px) {
      .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-buttons { flex-direction: column; }
      .btn-primary, .btn-ghost { width: 100%; }
    }