/* roulang page: index */
:root {
      --deep-blue: #1B2A6B;
      --deep-purple: #2D1B69;
      --gold: #F0A500;
      --cyan-glow: #00E5FF;
      --bg-deep: #0A0E1A;
      --bg-card: rgba(20, 30, 60, 0.6);
      --text-primary: #E0E6F0;
      --text-secondary: #8892B0;
      --text-white: #FFFFFF;
      --border-glass: rgba(255, 255, 255, 0.08);
      --border-hover: #F0A500;
      --shadow-glow: 0 0 20px rgba(240, 165, 0, 0.5), 0 0 40px rgba(240, 165, 0, 0.2);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-input: 12px;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      color: var(--text-white);
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      margin-bottom: 1rem;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      margin-bottom: 0.75rem;
    }

    a {
      color: var(--text-secondary);
      text-decoration: none;
      transition: color var(--transition);
    }

    a:hover {
      color: var(--text-white);
    }

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

    .container-custom {
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 26, 0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s ease;
    }

    .navbar-custom.scrolled {
      background: rgba(10, 14, 26, 0.9);
    }

    .nav-brand {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-white);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }

    .nav-brand i {
      color: var(--gold);
      font-size: 24px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      margin-left: auto;
      margin-right: 24px;
    }

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: #B0B8D0;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--gold);
      transition: width var(--transition);
    }

    .nav-links a:hover {
      color: var(--text-white);
    }

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

    .btn-glow {
      background: var(--gold);
      color: #0A0E1A;
      font-weight: 600;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      border: none;
      box-shadow: 0 0 20px rgba(240, 165, 0, 0.5), 0 0 40px rgba(240, 165, 0, 0.2);
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      font-size: 16px;
    }

    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(240, 165, 0, 0.8), 0 0 60px rgba(240, 165, 0, 0.4);
      transform: scale(1.05);
      color: #0A0E1A;
    }

    .btn-outline-glass {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: var(--text-white);
      font-weight: 500;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      font-size: 16px;
    }

    .btn-outline-glass:hover {
      border-color: var(--gold);
      color: var(--gold);
      background: rgba(240, 165, 0, 0.05);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 5px;
      margin-left: auto;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--text-white);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 移动端导航面板 */
    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 26, 0.95);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 32px;
      display: none;
      z-index: 999;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .mobile-menu a {
      display: block;
      padding: 12px 0;
      font-size: 18px;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      color: #B0B8D0;
    }

    /* Hero */
    .hero-section {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, #1B2A6B 0%, #0A0E1A 70%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }

    .stars-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      background: radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.4), transparent),
                  radial-gradient(1px 1px at 70% 40%, rgba(255,255,255,0.3), transparent),
                  radial-gradient(1px 1px at 30% 80%, rgba(255,255,255,0.5), transparent),
                  radial-gradient(2px 2px at 80% 15%, rgba(240,165,0,0.4), transparent),
                  radial-gradient(1px 1px at 50% 50%, rgba(0,229,255,0.4), transparent);
    }

    .hero-image-container {
      background: rgba(20, 30, 60, 0.4);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.1);
    }

    /* 亮点网格 */
    .highlight-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr;
      gap: 24px;
    }

    .large-card {
      grid-row: span 2;
    }

    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all var(--transition);
      box-shadow: var(--shadow-card);
      height: 100%;
    }

    .glass-card:hover {
      border-color: var(--cyan-glow);
      box-shadow: 0 0 25px rgba(0, 229, 255, 0.2);
      transform: translateY(-6px);
    }

    .icon-box {
      width: 64px;
      height: 64px;
      background: rgba(240, 165, 0, 0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--gold);
      font-size: 32px;
      margin-bottom: 24px;
    }

    .small-icon-box {
      width: 40px;
      height: 40px;
      font-size: 24px;
      margin-bottom: 16px;
    }

    /* 案例瀑布 */
    .case-grid {
      column-count: 3;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-glass);
      transition: all var(--transition);
    }

    .case-card:hover {
      border-color: var(--cyan-glow);
    }

    .case-img-wrap {
      position: relative;
      overflow: hidden;
      aspect-ratio: 16 / 9;
    }

    .case-img-wrap img {
      transition: transform 0.4s ease;
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }

    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 50%;
      background: linear-gradient(to top, rgba(10,14,26,0.9), transparent);
    }

    /* 方案对比 */
    .compare-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-card);
      padding: 40px;
      border: 1px solid var(--border-glass);
      transition: all var(--transition);
    }

    .compare-card.recommended {
      border-color: var(--gold);
      box-shadow: 0 0 25px rgba(240, 165, 0, 0.3);
    }

    /* FAQ */
    .accordion-faq .faq-item {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-glass);
      border-radius: 12px;
      margin-bottom: 12px;
      transition: all var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: #B0B8D0;
    }

    .faq-item.active {
      border-color: var(--cyan-glow);
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }

    /* 表单 */
    .form-glass input, .form-glass textarea {
      background: rgba(20, 30, 60, 0.5);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-input);
      color: white;
      padding: 12px 16px;
      width: 100%;
      transition: var(--transition);
    }

    .form-glass input:focus, .form-glass textarea:focus {
      border-color: var(--cyan-glow);
      box-shadow: 0 0 15px rgba(0, 229, 255, 0.2);
      outline: none;
    }

    footer {
      background: #060B14;
      border-top: 1px solid rgba(255,255,255,0.05);
    }

    @media (max-width: 992px) {
      .highlight-grid {
        grid-template-columns: 1fr 1fr;
      }
      .large-card {
        grid-column: span 2;
      }
      .case-grid {
        column-count: 2;
      }
      h1 {
        font-size: 40px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero-section .row {
        flex-direction: column;
        text-align: center;
      }
      .highlight-grid {
        grid-template-columns: 1fr;
      }
      .large-card {
        grid-column: span 1;
      }
      .case-grid {
        column-count: 1;
      }
      .compare-row {
        flex-direction: column;
      }
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 28px;
      }
    }