/* roulang page: index */
:root {
      --primary-color: #4F46E5;
      --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
      --aurora-cyan: #06B6D4;
      --accent-gold: #F59E0B;
      --dark-titanium: #0B0F19;
      --dark-surface: #111827;
      --light-bg: #F8FAFC;
      --card-border: rgba(226, 232, 240, 0.85);
      --text-main: #0F172A;
      --text-muted: #475569;
      --radius-sm: 12px;
      --radius-md: 20px;
      --radius-lg: 28px;
      --radius-pill: 9999px;
      --shadow-soft: 0 10px 25px -5px rgba(79, 70, 229, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 20px 35px -5px rgba(79, 70, 229, 0.16), 0 12px 16px -6px rgba(0, 0, 0, 0.08);
      --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--light-bg);
      color: var(--text-main);
      line-height: 1.68;
      overflow-x: hidden;
    }

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

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

    /* 顶部双行导航 */
    .top-status-bar {
      background: var(--dark-titanium);
      color: #94A3B8;
      font-size: 0.8125rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0.45rem 0;
    }
    .top-status-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background-color: #10B981;
      border-radius: 50%;
      margin-right: 6px;
      box-shadow: 0 0 8px #10B981;
    }

    .main-nav-wrapper {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      position: sticky;
      top: 0;
      z-index: 1030;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    }
    .nav-brand-text {
      font-weight: 800;
      font-size: 1.25rem;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.02em;
    }
    .nav-link-custom {
      font-size: 0.9375rem;
      font-weight: 600;
      color: #334155;
      padding: 0.5rem 0.9rem;
      border-radius: var(--radius-pill);
      transition: var(--transition-smooth);
    }
    .nav-link-custom:hover {
      color: var(--primary-color);
      background-color: rgba(79, 70, 229, 0.06);
    }

    /* 按钮与药丸徽章 */
    .btn-pill-primary {
      background: var(--primary-gradient);
      color: #FFFFFF !important;
      font-weight: 600;
      padding: 0.65rem 1.6rem;
      border-radius: var(--radius-pill);
      border: none;
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.28);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: var(--transition-smooth);
    }
    .btn-pill-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(79, 70, 229, 0.38);
    }
    .btn-pill-gold {
      background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
      color: #FFFFFF !important;
      font-weight: 600;
      padding: 0.65rem 1.6rem;
      border-radius: var(--radius-pill);
      border: none;
      box-shadow: 0 6px 18px rgba(245, 158, 11, 0.28);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-smooth);
    }
    .btn-pill-gold:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(245, 158, 11, 0.38);
    }
    .btn-pill-outline {
      border: 1px solid #CBD5E1;
      color: var(--text-main);
      background: #FFFFFF;
      font-weight: 600;
      padding: 0.65rem 1.5rem;
      border-radius: var(--radius-pill);
      transition: var(--transition-smooth);
    }
    .btn-pill-outline:hover {
      background: #F1F5F9;
      border-color: #94A3B8;
    }

    .data-badge-pill {
      display: inline-flex;
      align-items: center;
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary-color);
      border: 1px solid rgba(79, 70, 229, 0.16);
      font-size: 0.8125rem;
      font-weight: 700;
      padding: 0.3rem 0.85rem;
      border-radius: var(--radius-pill);
      margin-bottom: 0.85rem;
    }

    /* 圆角大卡样式 */
    .round-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-soft);
      transition: var(--transition-smooth);
      height: 100%;
      position: relative;
    }
    .round-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(79, 70, 229, 0.25);
    }

    .round-card-large {
      border-radius: var(--radius-lg);
    }

    /* Section 标准间距 */
    .section-padding {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 0.85rem;
      color: var(--text-main);
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 3rem auto;
    }

    /* 1. Hero 动效大图 Banner（促销主视觉+爆炸贴） */
    .hero-section {
      position: relative;
      background: linear-gradient(180deg, #FFFFFF 0%, #EEF2FF 100%);
      padding: 5.5rem 0 4.5rem;
      overflow: hidden;
    }
    .hero-badge-burst {
      display: inline-block;
      background: #EF4444;
      color: #FFFFFF;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 0.25rem 0.6rem;
      border-radius: 4px;
      transform: rotate(-3deg);
      box-shadow: 0 4px 10px rgba(239, 68, 68, 0.35);
      margin-left: 8px;
    }
    .hero-visual-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 25px 50px -12px rgba(79, 70, 229, 0.25);
      border: 2px solid #FFFFFF;
    }
    .hero-visual-card img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .hero-floating-stat {
      position: absolute;
      bottom: 1.5rem;
      left: 1.5rem;
      right: 1.5rem;
      background: rgba(15, 23, 42, 0.82);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      padding: 1.25rem;
      color: #FFFFFF;
    }

    /* 2. 合规与信任条 */
    .trust-strip {
      background: #FFFFFF;
      border-top: 1px solid #E2E8F0;
      border-bottom: 1px solid #E2E8F0;
      padding: 2.25rem 0;
    }
    .trust-pill-tag {
      background: #F1F5F9;
      border: 1px solid #E2E8F0;
      border-radius: var(--radius-pill);
      padding: 0.5rem 1.1rem;
      font-size: 0.875rem;
      font-weight: 600;
      color: #334155;
      text-align: center;
    }

    /* 4. 优势卡片容器图标 */
    .icon-box-gradient {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-sm);
      background: var(--primary-gradient);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      font-weight: 800;
      margin-bottom: 1.25rem;
    }

    /* 6. 深钛黑全屏基建底座 */
    .dark-infra-section {
      background-color: var(--dark-titanium);
      color: #F8FAFC;
      position: relative;
      overflow: hidden;
    }
    .dark-infra-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 2rem;
      backdrop-filter: blur(6px);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .dark-infra-card:hover {
      background: rgba(255, 255, 255, 0.07);
      border-color: var(--aurora-cyan);
      transform: translateY(-4px);
    }

    /* 8. 关键数据计数区 */
    .metrics-container {
      background: linear-gradient(135deg, #312E81 0%, #1E1B4B 100%);
      border-radius: var(--radius-lg);
      padding: 3rem 2rem;
      color: #FFFFFF;
    }
    .metric-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: #38BDF8;
      letter-spacing: -0.03em;
      line-height: 1.1;
    }

    /* 10. 套餐阶梯卡片 */
    .pricing-featured-card {
      background: #FFFFFF;
      border: 2px solid var(--primary-color) !important;
      box-shadow: 0 15px 35px rgba(79, 70, 229, 0.18) !important;
      position: relative;
      overflow: hidden;
    }
    .pricing-popular-badge {
      position: absolute;
      top: 15px;
      right: -32px;
      background: var(--primary-gradient);
      color: #FFFFFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 38px;
      transform: rotate(45deg);
    }

    /* 12. 折叠 FAQ 重塑 */
    .accordion-button-custom {
      background-color: #FFFFFF !important;
      border-radius: var(--radius-md) !important;
      font-weight: 700;
      color: var(--text-main) !important;
      padding: 1.25rem 1.5rem;
      box-shadow: none !important;
      border: 1px solid #E2E8F0;
    }
    .accordion-button-custom:not(.collapsed) {
      color: var(--primary-color) !important;
      border-color: rgba(79, 70, 229, 0.3);
      background-color: #F8FAFC !important;
    }
    .accordion-body-custom {
      padding: 1.25rem 1.5rem;
      color: var(--text-muted);
      background-color: #FFFFFF;
      border: 1px solid #E2E8F0;
      border-top: none;
      border-bottom-left-radius: var(--radius-md);
      border-bottom-right-radius: var(--radius-md);
    }

    /* 13. 底部主转化区 */
    .cta-banner-wrapper {
      background: var(--primary-gradient);
      border-radius: var(--radius-lg);
      padding: 4rem 2rem;
      color: #FFFFFF;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 45px -10px rgba(79, 70, 229, 0.45);
    }

    /* 页脚 */
    .footer-wrapper {
      background-color: #070B14;
      color: #94A3B8;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
      padding: 4.5rem 0 2.5rem;
    }
    .footer-title {
      font-weight: 700;
      color: #FFFFFF;
      font-size: 1rem;
      margin-bottom: 1.25rem;
    }
    .footer-list {
      list-style: none;
      padding-left: 0;
    }
    .footer-list li {
      margin-bottom: 0.65rem;
    }
    .footer-list a:hover {
      color: #FFFFFF;
    }
    .footer-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin: 2.5rem 0 1.5rem;
    }

    /* 响应式断点优化 */
    @media (max-width: 991.98px) {
      .section-padding {
        padding: 3.5rem 0;
      }
      .hero-visual-card img {
        height: 320px;
      }
      .nav-links-left, .nav-links-right {
        display: none !important;
      }
    }