/* roulang page: index */
:root {
      --primary: #0B1B13;
      --accent: #00E575;
      --accent-hover: #00c765;
      --spotlight: #FF5A1F;
      --bg-light: #F4F6F5;
      --bg-white: #FFFFFF;
      --border-color: #E2E8F0;
      --border-dark: rgba(0, 229, 117, 0.2);
      --text-main: #1F2923;
      --text-muted: #5A6D63;
      --radius: 6px;
      --shadow-sm: 0 2px 8px rgba(11, 27, 19, 0.04);
      --shadow-md: 0 10px 24px rgba(11, 27, 19, 0.08);
      --shadow-lg: 0 18px 36px rgba(11, 27, 19, 0.12);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    body {
      font-family: var(--font-stack);
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.7;
      letter-spacing: -0.01em;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Topbar & Sticky Header */
    .top-bar {
      background-color: #0d2218;
      color: #9bb0a5;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 8px 0;
    }

    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }

    .brand-badge {
      font-size: 11px;
      background: var(--primary);
      color: var(--accent);
      padding: 2px 8px;
      border-radius: 4px;
      letter-spacing: 0.5px;
      text-transform: uppercase;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-hover);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--primary);
      color: var(--accent);
      padding: 10px 22px;
      border-radius: var(--radius);
      font-weight: 600;
      font-size: 14px;
      border: 1px solid var(--accent);
      transition: all 0.25s ease;
    }

    .nav-cta:hover {
      background: var(--accent);
      color: var(--primary);
      box-shadow: 0 4px 12px rgba(0, 229, 117, 0.35);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* Section Global Styles */
    section {
      padding: 88px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-light);
    }

    .section-dark {
      background-color: #060F0A;
      color: #E2E8F0;
    }

    .section-header {
      margin-bottom: 56px;
    }

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      color: var(--spotlight);
      background: rgba(255, 90, 31, 0.1);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      line-height: 1.35;
      color: var(--primary);
      margin-bottom: 16px;
      font-weight: 700;
    }

    .section-dark .section-title {
      color: #FFFFFF;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 860px;
      line-height: 1.75;
    }

    .section-dark .section-desc {
      color: #9BB0A5;
    }

    /* Hero: 全宽浅色顶栏 + 矮横幅 */
    .hero-strip {
      background: linear-gradient(180deg, #F0F5F2 0%, #FFFFFF 100%);
      border-bottom: 1px solid var(--border-color);
      padding: 48px 0 60px;
    }

    .hero-banner {
      background: url('/assets/images/fd87756486d89feb.jpg') center/cover no-repeat;
      border-radius: 8px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid rgba(11, 27, 19, 0.1);
    }

    .hero-banner-overlay {
      background: linear-gradient(90deg, rgba(11, 27, 19, 0.94) 0%, rgba(11, 27, 19, 0.8) 60%, rgba(11, 27, 19, 0.4) 100%);
      padding: 56px 48px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      min-height: 380px;
    }

    .hero-content {
      max-width: 720px;
      color: #FFFFFF;
    }

    .hero-title {
      font-size: 36px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
      letter-spacing: -0.02em;
    }

    .hero-title span {
      color: var(--accent);
    }

    .hero-p {
      font-size: 16px;
      color: #D1DED7;
      line-height: 1.8;
      margin-bottom: 28px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-main {
      display: inline-flex;
      align-items: center;
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      font-size: 15px;
      padding: 13px 28px;
      border-radius: var(--radius);
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .btn-main:hover {
      background: #00ff83;
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(0, 229, 117, 0.35);
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      background: rgba(255, 255, 255, 0.12);
      color: #FFFFFF;
      font-weight: 600;
      font-size: 15px;
      padding: 13px 24px;
      border-radius: var(--radius);
      border: 1px solid rgba(255, 255, 255, 0.3);
      transition: all 0.25s ease;
    }

    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.2);
    }

    /* 板块 2：客户案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 229, 117, 0.4);
    }

    .case-card-img {
      height: 200px;
      overflow: hidden;
      background-color: #E2E8F0;
    }

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

    .case-card:hover .case-card-img img {
      transform: scale(1.05);
    }

    .case-card-body {
      padding: 24px;
    }

    .case-tag {
      font-size: 12px;
      font-weight: 600;
      color: var(--accent-hover);
      margin-bottom: 8px;
      display: block;
    }

    .case-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .case-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 3：结果数据条 */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #FFFFFF;
      padding: 36px 40px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .metric-item {
      border-right: 1px solid var(--border-color);
      padding-right: 20px;
    }

    .metric-item:last-child {
      border-right: none;
      padding-right: 0;
    }

    .metric-value {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 6px;
      font-feature-settings: "tnum";
    }

    .metric-value span {
      color: var(--accent-hover);
      font-size: 24px;
    }

    .metric-label {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .metric-sub {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块 4：前后对比 */
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-box {
      border-radius: var(--radius);
      padding: 36px;
      border: 1px solid var(--border-color);
      background: #FFFFFF;
    }

    .compare-box.traditional {
      background: #FDFEFE;
      border-top: 4px solid #CBD5E1;
    }

    .compare-box.modern {
      background: #FAFCFA;
      border-top: 4px solid var(--accent);
      box-shadow: var(--shadow-sm);
    }

    .compare-header {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .compare-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .compare-list li {
      font-size: 14px;
      line-height: 1.6;
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }

    .compare-icon-bad {
      color: #94A3B8;
      font-weight: 700;
    }

    .compare-icon-good {
      color: var(--accent-hover);
      font-weight: 700;
    }

    /* 板块 5：方法说明（核心功能矩阵） */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: #FFFFFF;
      padding: 32px 28px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      transition: all 0.25s ease;
    }

    .feature-card:hover {
      border-color: var(--border-dark);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    .feature-badge {
      width: 44px;
      height: 44px;
      border-radius: 6px;
      background: #E8F8EE;
      color: var(--accent-hover);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 20px;
    }

    .feature-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }

    .feature-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 6：价格与套餐选型对比 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }

    .pricing-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px 30px;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .pricing-card.featured {
      border: 2px solid var(--accent);
      box-shadow: var(--shadow-lg);
      transform: scale(1.02);
    }

    .featured-ribbon {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--accent);
      color: var(--primary);
      font-size: 11px;
      font-weight: 700;
      padding: 3px 12px;
      border-radius: 4px;
    }

    .pricing-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .pricing-desc {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 24px;
      min-height: 42px;
    }

    .pricing-specs {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 14px;
      color: var(--text-main);
    }

    .pricing-specs li {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .pricing-specs li::before {
      content: "✓";
      color: var(--accent-hover);
      font-weight: bold;
    }

    /* 板块 7：裂变邀请与分销体系说明 */
    .referral-box {
      background: linear-gradient(135deg, #0B1B13 0%, #152E22 100%);
      color: #FFFFFF;
      border-radius: var(--radius);
      padding: 48px;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .referral-info h3 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #FFFFFF;
    }

    .referral-info p {
      font-size: 15px;
      color: #C2D6CC;
      line-height: 1.75;
      margin-bottom: 24px;
    }

    .referral-stats {
      display: flex;
      gap: 32px;
    }

    .referral-stat-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent);
    }

    .referral-progress-wrap {
      background: rgba(255, 255, 255, 0.08);
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid rgba(255, 255, 255, 0.12);
    }

    .progress-bar-bg {
      height: 8px;
      background: rgba(255, 255, 255, 0.2);
      border-radius: 4px;
      margin: 12px 0 8px;
      overflow: hidden;
    }

    .progress-bar-fill {
      height: 100%;
      width: 78%;
      background: var(--accent);
      border-radius: 4px;
    }

    /* 板块 8：资讯与技术摘要 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .news-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      transition: border-color 0.2s ease;
    }

    .news-item:hover {
      border-color: var(--accent);
    }

    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 10px;
    }

    .news-heading {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
      line-height: 1.45;
    }

    .news-summary {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 9：异议拆解 FAQ */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--text-muted);
      transition: transform 0.25s ease;
    }

    .faq-card.open .faq-question::after {
      transform: rotate(45deg);
      color: var(--accent-hover);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #F1F5F3;
    }

    .faq-card.open .faq-answer {
      display: block;
    }

    /* 板块 10：保障条 */
    .sla-strip {
      background: #0B1B13;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      padding: 48px 0;
    }

    .sla-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .sla-box {
      display: flex;
      align-items: center;
      gap: 16px;
      color: #FFFFFF;
    }

    .sla-num {
      width: 44px;
      height: 44px;
      border: 1px solid var(--accent);
      color: var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      flex-shrink: 0;
    }

    .sla-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .sla-desc {
      font-size: 13px;
      color: #8CA89A;
    }

    /* 板块 11：咨询入口 (CTA 表单) */
    .cta-wrapper {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
    }

    .cta-side-text {
      background: #0B1B13;
      color: #FFFFFF;
      padding: 56px 44px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .cta-side-text h3 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.35;
    }

    .cta-side-text p {
      font-size: 15px;
      color: #A3BDAD;
      line-height: 1.75;
      margin-bottom: 24px;
    }

    .cta-side-contacts {
      font-size: 14px;
      color: #FFFFFF;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .cta-form-wrap {
      padding: 56px 44px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 12px 14px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      font-family: inherit;
      color: var(--text-main);
      background: #FFFFFF;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--accent-hover);
    }

    /* Footer */
    footer {
      background-color: #060F0A;
      color: #A3BDAD;
      font-size: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 64px 0 32px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1.2fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-col-title {
      font-size: 15px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 20px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a:hover {
      color: var(--accent);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: #6C8577;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .cases-grid,
      .features-grid,
      .pricing-grid,
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
      }
      .metric-item {
        border-right: none;
      }
      .sla-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        padding: 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-cta {
        display: none;
      }
      .cases-grid,
      .features-grid,
      .pricing-grid,
      .news-grid,
      .compare-container,
      .referral-box,
      .cta-wrapper {
        grid-template-columns: 1fr;
      }
      .metrics-bar {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .sla-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-banner-overlay {
        padding: 36px 24px;
      }
      .hero-title {
        font-size: 26px;
      }
      .cta-side-text,
      .cta-form-wrap {
        padding: 36px 24px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }