/* roulang page: index */
:root {
      --deep-black: #0A0E17;
      --flame-red: #FF3C38;
      --glory-gold: #D4AF37;
      --dark-card: #1C212B;
      --light-bg: #F2F3F5;
      --text-primary: #EAECEF;
      --text-secondary: #8B939C;
      --white: #ffffff;
      --border-light: rgba(255,255,255,0.06);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.10);
      --shadow-badge: 0 4px 16px rgba(0,0,0,0.30);
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-sm: 6px;
      --transition: 0.25s ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-mono: 'DIN Alternate', 'SF Mono', 'Menlo', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--light-bg);
      color: #1C212B;
      line-height: 1.7;
      font-size: 15px;
      margin: 0;
      padding-top: 64px;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.3px;
    }

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

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

    .container {
      max-width: 1200px;
    }

    /* 导航栏 */
    .navbar {
      background: rgba(10,14,23,0.92);
      backdrop-filter: blur(10px);
      height: 64px;
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 0;
    }

    .navbar-brand {
      font-family: var(--font-heading);
      font-size: 20px;
      font-weight: 700;
      color: var(--text-primary) !important;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
    }

    .navbar-brand i {
      font-size: 22px;
      color: var(--flame-red);
      margin-right: 8px;
    }

    .nav-link {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-secondary) !important;
      margin: 0 20px;
      padding: 8px 0 !important;
      position: relative;
      transition: var(--transition);
    }

    .nav-link:hover {
      color: var(--text-primary) !important;
    }

    .nav-link.active {
      color: var(--flame-red) !important;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background: var(--flame-red);
      border-radius: 1px;
    }

    .btn-nav-cta {
      background: var(--flame-red);
      color: white;
      font-size: 13px;
      font-weight: 600;
      padding: 8px 20px;
      border-radius: var(--radius-sm);
      border: none;
      transition: var(--transition);
    }

    .btn-nav-cta:hover {
      background: #D6342E;
      transform: scale(1.03);
      color: white;
    }

    .navbar-toggler {
      border: none;
      padding: 0;
    }

    .navbar-toggler-icon {
      background-image: none;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      width: 24px;
      height: 24px;
    }

    .navbar-toggler-icon::before,
    .navbar-toggler-icon::after,
    .navbar-toggler-icon span {
      content: '';
      display: block;
      width: 22px;
      height: 1.5px;
      background: var(--text-primary);
      margin: 3px 0;
      transition: var(--transition);
    }

    /* Hero */
    .hero-section {
      background-color: var(--deep-black);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 80px 0 100px;
      color: var(--text-primary);
    }

    .hero-section::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(10,14,23,0.75);
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero-title {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
    }

    .hero-sub {
      font-size: 18px;
      line-height: 1.6;
      color: var(--text-secondary);
      max-width: 550px;
      margin: 20px 0 32px;
    }

    .btn-primary-custom {
      background: var(--flame-red);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-size: 15px;
      transition: var(--transition);
    }

    .btn-primary-custom:hover {
      background: #D6342E;
      transform: scale(1.03);
      color: white;
    }

    .btn-outline-custom {
      border: 1.5px solid var(--text-secondary);
      color: var(--text-primary);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-size: 15px;
      background: transparent;
      transition: var(--transition);
    }

    .btn-outline-custom:hover {
      border-color: var(--flame-red);
      color: var(--flame-red);
    }

    .hero-visual {
      position: relative;
      z-index: 2;
    }

    .img-card-stack {
      position: relative;
      width: 100%;
      height: 320px;
    }

    .img-card {
      position: absolute;
      width: 180px;
      height: 120px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 20px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* 数据徽章 */
    .badge-strip {
      background: var(--deep-black);
      padding: 48px 0;
    }

    .badge-card {
      background: var(--dark-card);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      text-align: center;
      border-top: 2px solid var(--glory-gold);
      box-shadow: var(--shadow-badge);
      color: var(--text-primary);
    }

    .badge-label {
      font-size: 10px;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--glory-gold);
      font-weight: 600;
      margin-bottom: 12px;
    }

    .badge-number {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.2;
    }

    .badge-desc {
      font-size: 13px;
      color: var(--text-secondary);
      margin-top: 8px;
    }

    /* 亮点服务网格 */
    .service-grid .card {
      background: white;
      border: none;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      padding: 24px;
    }

    .service-grid .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .service-img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .card-text {
      color: #5a5f66;
      font-size: 15px;
      margin-bottom: 12px;
    }

    .text-link {
      color: var(--flame-red);
      font-weight: 600;
      font-size: 14px;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 2;
      column-gap: 24px;
    }

    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .masonry-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .masonry-img {
      width: 100%;
      display: block;
      transition: 0.3s;
    }

    .masonry-item:hover .masonry-img {
      filter: brightness(0.9);
    }

    .masonry-content {
      padding: 16px;
    }

    /* 方案对比表 */
    .compare-table {
      display: flex;
      gap: 0;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .compare-col {
      flex: 1;
      background: white;
      padding: 32px 24px;
      text-align: center;
    }

    .compare-col.highlight {
      background: var(--dark-card);
      color: var(--text-primary);
      position: relative;
      transform: scale(1.02);
      border-radius: var(--radius-lg);
      box-shadow: 0 10px 30px rgba(0,0,0,0.3);
      z-index: 2;
    }

    .popular-badge {
      background: var(--flame-red);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .compare-feature {
      padding: 12px 0;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }

    .highlight .compare-feature {
      border-color: rgba(255,255,255,0.1);
    }

    .check-gold {
      color: var(--glory-gold);
      font-weight: bold;
    }

    /* FAQ */
    .faq-category i {
      font-size: 32px;
      color: var(--flame-red);
      margin-bottom: 16px;
    }

    .accordion-button {
      font-weight: 600;
      font-size: 18px;
      box-shadow: none;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }

    .accordion-button:not(.collapsed) {
      background: #f8f9fa;
      border-left: 3px solid var(--flame-red);
      color: #0A0E17;
    }

    /* CTA横幅 */
    .cta-banner {
      background: var(--deep-black);
      padding: 80px 0;
      text-align: center;
    }

    .btn-cta-large {
      background: var(--flame-red);
      color: white;
      font-weight: 700;
      padding: 18px 48px;
      font-size: 18px;
      border-radius: var(--radius-md);
      border: none;
      transition: var(--transition);
    }

    .btn-cta-large:hover {
      background: #D6342E;
      transform: scale(1.03);
    }

    /* 页脚 */
    .footer {
      background: var(--dark-card);
      color: var(--text-secondary);
      padding: 60px 0 30px;
    }

    .footer a {
      color: var(--text-secondary);
    }

    .footer a:hover {
      color: var(--flame-red);
    }

    .footer-brand {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-primary);
    }

    @media (max-width: 768px) {
      body {
        padding-top: 56px;
      }
      .navbar {
        height: 56px;
      }
      .hero-title {
        font-size: 32px;
      }
      .masonry-grid {
        column-count: 1;
      }
      .compare-table {
        flex-direction: column;
        overflow-x: auto;
      }
      .compare-col.highlight {
        transform: none;
      }
    }