/* roulang page: index */
:root {
      --primary-deep: #0D2B5E;
      --accent-neon: #00C6C6;
      --bg-light: #F4F7FC;
      --card-bg: #FFFFFF;
      --dark-bg: #0A1F3F;
      --text-main: #1A1A1A;
      --text-secondary: #4A5568;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-base: 0.3s ease;
      --font-stack: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --neon-glow: 0 0 12px rgba(0,198,198,0.5);
      --neon-text-glow: 0 0 8px rgba(0,198,198,0.4);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-stack);
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--bg-light);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      margin-bottom: 1.5rem;
    }
    
    a {
      text-decoration: none;
      transition: color var(--transition-base);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container-custom {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      background-color: var(--dark-bg);
      height: 72px;
      display: flex;
      align-items: center;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    
    .navbar-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .navbar-brand {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    
    .brand-icon {
      width: 24px;
      height: 24px;
      background-color: var(--accent-neon);
      border-radius: 4px;
      display: inline-block;
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    
    .nav-link {
      color: white;
      font-size: 0.95rem;
      font-weight: 500;
      position: relative;
      padding: 0.5rem 0;
      transition: all var(--transition-base);
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent-neon);
      transition: width var(--transition-base);
    }
    
    .nav-link:hover,
    .nav-link.active {
      color: var(--accent-neon);
      text-shadow: var(--neon-text-glow);
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    
    .btn-neon {
      background-color: var(--accent-neon);
      color: var(--dark-bg);
      font-weight: 600;
      letter-spacing: 0.5px;
      padding: 0.6rem 1.5rem;
      border-radius: 6px;
      border: none;
      transition: all var(--transition-base);
      white-space: nowrap;
    }
    
    .btn-neon:hover {
      background-color: #00B0B0;
      box-shadow: var(--neon-glow);
      color: var(--dark-bg);
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 5px;
    }
    
    .hamburger span {
      width: 25px;
      height: 3px;
      background: white;
      border-radius: 3px;
      transition: all var(--transition-base);
    }
    
    /* Hero */
    .hero-section {
      min-height: 90vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      margin-top: 72px;
    }
    
    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(13,43,94,0.8) 0%, rgba(10,31,63,0.9) 100%);
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 2rem;
    }
    
    .hero-text {
      flex: 1;
      color: white;
    }
    
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
      margin-bottom: 1.5rem;
      border-left: 4px solid var(--accent-neon);
      padding-left: 1.5rem;
    }
    
    .hero-subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.9);
      max-width: 600px;
      margin-bottom: 2rem;
    }
    
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
    .btn-primary-neon {
      background-color: var(--accent-neon);
      color: var(--dark-bg);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      border: none;
      transition: all var(--transition-base);
    }
    
    .btn-primary-neon:hover {
      background-color: #00B0B0;
      box-shadow: var(--neon-glow);
    }
    
    .btn-outline-neon {
      background: transparent;
      color: var(--accent-neon);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      border: 2px solid var(--accent-neon);
      transition: all var(--transition-base);
    }
    
    .btn-outline-neon:hover {
      background-color: var(--accent-neon);
      color: var(--dark-bg);
    }
    
    .hero-image {
      flex: 1;
      text-align: center;
    }
    
    .hero-image img {
      max-height: 450px;
      filter: drop-shadow(0 10px 20px rgba(0,0,0,0.3));
    }
    
    /* 通用区块 */
    .section-padding {
      padding: 5rem 0;
    }
    
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 1.5rem;
    }
    
    .section-subtitle {
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 3rem;
      text-align: center;
    }
    
    /* 核心优势卡片 */
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      height: 100%;
      text-align: center;
    }
    
    .feature-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    
    .feature-icon {
      font-size: 2.5rem;
      color: var(--accent-neon);
      margin-bottom: 1.2rem;
      background: rgba(0,198,198,0.1);
      width: 70px;
      height: 70px;
      line-height: 70px;
      border-radius: 50%;
      margin-left: auto;
      margin-right: auto;
    }
    
    .feature-card h3 {
      font-size: 1.35rem;
      font-weight: 600;
      color: var(--text-main);
    }
    
    /* 数据深色条 */
    .data-strip {
      background-color: var(--dark-bg);
      padding: 3rem 0;
    }
    
    .data-item {
      text-align: center;
      color: white;
    }
    
    .data-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent-neon);
    }
    
    .data-label {
      color: rgba(255,255,255,0.7);
      font-size: 1rem;
    }
    
    /* 案例卡片 */
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      height: 100%;
    }
    
    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    
    .case-img {
      height: 200px;
      object-fit: cover;
    }
    
    .case-body {
      padding: 1.5rem;
    }
    
    .case-tag {
      background: rgba(0,198,198,0.15);
      color: var(--accent-neon);
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    
    /* 解决方案左右交替 */
    .solution-row {
      display: flex;
      align-items: center;
      margin-bottom: 4rem;
      gap: 3rem;
    }
    
    .solution-text {
      flex: 1;
    }
    
    .solution-image {
      flex: 1;
    }
    
    .solution-image img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    
    .solution-list {
      list-style: none;
      padding-left: 0;
    }
    
    .solution-list li {
      margin-bottom: 0.5rem;
      color: var(--text-secondary);
    }
    
    .solution-list i {
      color: var(--accent-neon);
      margin-right: 0.5rem;
    }
    
    /* FAQ 手风琴 */
    .accordion-custom .accordion-item {
      border: none;
      margin-bottom: 1rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      background: var(--card-bg);
    }
    
    .accordion-custom .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-main);
      background: white;
      border-radius: var(--radius-card) !important;
      box-shadow: none;
      padding: 1.2rem 1.5rem;
    }
    
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--accent-neon);
      background-color: #F8FAFD;
    }
    
    .accordion-custom .accordion-button::after {
      display: none;
    }
    
    .accordion-icon {
      width: 32px;
      height: 32px;
      background: rgba(0,198,198,0.1);
      color: var(--accent-neon);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-right: 1rem;
      transition: transform var(--transition-base);
    }
    
    .accordion-button:not(.collapsed) .accordion-icon {
      transform: rotate(45deg);
      background: var(--accent-neon);
      color: white;
    }
    
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0D2B5E 0%, #0A3D7A 100%);
      padding: 4rem 0;
      color: white;
    }
    
    .cta-form input,
    .cta-form textarea {
      border-radius: var(--radius-btn);
      border: 1px solid var(--border-light);
      padding: 0.8rem 1rem;
      width: 100%;
      margin-bottom: 1rem;
    }
    
    .cta-form input:focus,
    .cta-form textarea:focus {
      border-color: var(--accent-neon);
      box-shadow: 0 0 0 3px rgba(0,198,198,0.15);
      outline: none;
    }
    
    /* 页脚 */
    .footer {
      background-color: var(--dark-bg);
      color: #CBD5E0;
      padding: 3rem 0 0;
    }
    
    .footer a {
      color: #CBD5E0;
    }
    
    .footer a:hover {
      color: var(--accent-neon);
    }
    
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding: 1.5rem 0;
      margin-top: 2rem;
      text-align: center;
      font-size: 0.9rem;
    }
    
    /* 移动端响应式 */
    @media (max-width: 992px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.5rem;
        border-left: none;
        padding-left: 0;
        text-align: center;
      }
      .solution-row {
        flex-direction: column !important;
      }
      .solution-row.reverse {
        flex-direction: column !important;
      }
    }
    
    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--dark-bg);
        flex-direction: column;
        padding: 1rem 0;
        gap: 1rem;
        display: none;
      }
      .nav-menu.active {
        display: flex;
      }
      .hero-text h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .data-strip .row > div {
        margin-bottom: 1.5rem;
      }
    }