/* roulang page: index */
:root {
      --primary-cyan: #0AE0E0;
      --primary-cyan-hover: #00C8C8;
      --deep-blue: #1B2A3B;
      --bg-warm: #F7F8FA;
      --white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-muted: #5F6B7A;
      --border-light: #E2E6EB;
      --accent-green: #00D68F;
      --accent-orange: #FF6B35;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 20px;
      --radius-sm: 6px;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-display: "Inter", "SF Pro Display", -apple-system, sans-serif;
      --transition-base: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      padding-top: 68px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition-base);
    }
    .container {
      max-width: 1320px;
    }
    /* 自定义按钮覆盖 */
    .btn-primary-custom {
      background-color: var(--primary-cyan);
      border: none;
      color: #1E1E1E;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-cyan-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(10,224,224,0.3);
      color: #1E1E1E;
    }
    .btn-outline-light-custom {
      border: 1px solid var(--primary-cyan);
      background: transparent;
      color: var(--text-dark);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      transition: var(--transition-base);
      background-color: white;
    }
    .btn-outline-light-custom:hover {
      background-color: rgba(10,224,224,0.08);
      border-color: var(--primary-cyan-hover);
      color: var(--text-dark);
      transform: translateY(-2px);
    }
    .btn-light-cyan {
      background-color: var(--white);
      color: var(--deep-blue);
      font-weight: 600;
      border-radius: 30px;
      padding: 0.8rem 2.4rem;
      border: none;
      transition: var(--transition-base);
    }
    .btn-light-cyan:hover {
      background-color: var(--primary-cyan);
      color: #1E1E1E;
      box-shadow: 0 0 20px rgba(10,224,224,0.5);
    }
    /* 导航 */
    .navbar-custom {
      background: var(--white);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      height: 68px;
      padding: 0 1rem;
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1030;
    }
    .navbar-brand-custom {
      font-weight: 700;
      font-size: 22px;
      color: var(--deep-blue);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .brand-icon {
      font-size: 24px;
      color: var(--primary-cyan);
    }
    .navbar-nav .nav-link {
      color: var(--text-muted) !important;
      font-weight: 500;
      font-size: 15px;
      padding: 0.5rem 1rem;
      transition: var(--transition-base);
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--primary-cyan) !important;
    }
    .nav-link.active {
      border-bottom: 2px solid var(--primary-cyan);
    }
    .search-box {
      background: #f0f2f5;
      border-radius: 20px;
      padding: 0.25rem 1rem;
      display: flex;
      align-items: center;
      color: var(--text-muted);
      margin-right: 0.8rem;
    }
    .search-box i {
      font-size: 14px;
      margin-right: 4px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 120px;
    }
    @media (max-width: 991px) {
      .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 0 0 12px 12px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.06);
      }
    }
    /* Hero */
    .hero-section {
      background-color: var(--bg-warm);
      padding: 4rem 0;
      position: relative;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--deep-blue);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
    }
    .hero-image {
      border-radius: 16px;
      box-shadow: var(--shadow-card-hover);
      width: 100%;
      object-fit: cover;
    }
    /* 区块标题 */
    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--deep-blue);
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
    }
    /* 亮点卡片 */
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      height: 100%;
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .feature-icon {
      font-size: 44px;
      color: var(--primary-cyan);
      margin-bottom: 1rem;
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
    }
    /* 案例瀑布 */
    .masonry-grid {
      column-count: 3;
      column-gap: 1.5rem;
    }
    @media (max-width: 992px) {
      .masonry-grid { column-count: 2; }
    }
    @media (max-width: 768px) {
      .masonry-grid { column-count: 1; }
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 1.5rem;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
    }
    .masonry-item:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-card-hover);
    }
    .masonry-item img {
      transition: transform 0.4s ease;
      width: 100%;
    }
    .masonry-item:hover img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 1.2rem;
    }
    /* 对比卡 */
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      height: 100%;
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
    }
    .pricing-card.recommended {
      border: 2px solid var(--primary-cyan);
      box-shadow: 0 12px 28px rgba(10,224,224,0.12);
      transform: scale(1.02);
    }
    .badge-popular {
      background: var(--accent-orange);
      color: white;
      font-weight: 600;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    .price {
      font-family: var(--font-display);
      font-size: 40px;
      font-weight: 700;
      color: var(--deep-blue);
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: rgba(10,224,224,0.06);
      color: var(--deep-blue);
      font-weight: 600;
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 0 0.15rem rgba(10,224,224,0.25);
    }
    .accordion-item {
      border-left: none;
      border-right: none;
      border-color: var(--border-light);
    }
    /* CTA 横幅 */
    .cta-band {
      background-color: var(--deep-blue);
      padding: 5rem 0;
    }
    /* Footer */
    .footer-custom {
      background: var(--deep-blue);
      color: #B0BEC5;
    }
    .footer-custom h5 {
      color: white;
      font-weight: 600;
    }
    .footer-custom a {
      color: #B0BEC5;
    }
    .footer-custom a:hover {
      color: var(--primary-cyan);
    }
    .social-icon {
      font-size: 1.4rem;
      margin-right: 1rem;
      color: #B0BEC5;
      transition: var(--transition-base);
    }
    .social-icon:hover {
      color: var(--primary-cyan);
      transform: scale(1.1);
    }