/* roulang page: index */
:root {
      --color-primary: #0A4D68;
      --color-primary-dark: #083D53;
      --color-primary-light: #0E6C92;
      --color-accent-green: #00EA76;
      --color-accent-orange: #FF6B35;
      --color-bg-light: #F8FAFC;
      --color-bg-white: #FFFFFF;
      --color-bg-dark: #0F172A;
      --color-bg-card-dark: #1E293B;
      --color-text-main: #334155;
      --color-text-muted: #64748B;
      --color-text-inverse: #F1F5F9;
      --color-border: #E2E8F0;
      --color-border-dark: rgba(255, 255, 255, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.07);
      --shadow-lg: 0 16px 36px -6px rgba(15, 23, 42, 0.12);
      --transition-standard: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--color-bg-light);
      color: var(--color-text-main);
      line-height: 1.78;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

    a { color: var(--color-primary); text-decoration: none; transition: var(--transition-standard); }
    a:hover { color: var(--color-accent-orange); }
    img { max-width: 100%; height: auto; display: block; }
    h1, h2, h3, h4, h5 { color: var(--color-primary-dark); font-weight: 700; line-height: 1.35; margin-bottom: 0.75rem; }

    /* 顶部微型信息条 */
    .top-meta-bar {
      background: #081D29;
      color: #94A3B8;
      font-size: 12px;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-meta-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px;
    }
    .top-meta-contacts { display: flex; gap: 20px; align-items: center; }
    .top-meta-contacts i { color: var(--color-accent-green); margin-right: 5px; }

    /* 主导航 */
    .site-header {
      background: #FFFFFF;
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 2px 14px rgba(15, 23, 42, 0.06);
      border-bottom: 1px solid var(--color-border);
    }
    .nav-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 12px 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .brand-logo-area { display: flex; align-items: center; gap: 10px; }
    .brand-icon-shield {
      width: 40px;
      height: 40px;
      background: var(--color-primary);
      color: var(--color-accent-green);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 20px;
    }
    .brand-name {
      font-size: 20px;
      font-weight: 800;
      color: var(--color-primary-dark);
      letter-spacing: -0.5px;
    }
    .brand-sub { font-size: 10px; color: var(--color-text-muted); display: block; line-height: 1; margin-top: 2px; }

    .nav-links-menu {
      display: flex;
      list-style: none;
      gap: 24px;
      margin: 0;
      align-items: center;
    }
    .nav-links-menu a {
      font-weight: 600;
      font-size: 14px;
      color: var(--color-text-main);
      padding: 6px 2px;
      position: relative;
    }
    .nav-links-menu a:hover, .nav-links-menu a.active { color: var(--color-primary); }
    .nav-links-menu a:hover::after, .nav-links-menu a.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--color-accent-green);
    }

    .btn-nav-action {
      background: var(--color-accent-orange);
      color: #FFF !important;
      font-size: 13px;
      font-weight: 700;
      padding: 8px 18px !important;
      border-radius: var(--radius-sm);
      box-shadow: 0 3px 10px rgba(255, 107, 53, 0.28);
    }
    .btn-nav-action:hover {
      background: #E85A26;
      transform: translateY(-1px);
    }
    .mobile-menu-trigger {
      display: none;
      background: none;
      border: none;
      font-size: 22px;
      color: var(--color-primary);
      cursor: pointer;
    }

    /* 面包屑指示条 */
    .breadcrumb-strip {
      background: #F1F5F9;
      border-bottom: 1px solid var(--color-border);
      padding: 8px 0;
      font-size: 12px;
      color: var(--color-text-muted);
    }
    .breadcrumb-inner {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .breadcrumb-inner a { color: var(--color-text-muted); }
    .breadcrumb-inner a:hover { color: var(--color-primary); }

    /* 通用板块与排版 */
    .site-section {
      padding: 84px 0;
      position: relative;
    }
    .section-white { background: #FFFFFF; }
    .section-slate { background: var(--color-bg-light); }
    .section-dark {
      background-color: var(--color-bg-dark);
      color: var(--color-text-inverse);
    }
    .section-header-block {
      max-width: 760px;
      margin: 0 auto 52px auto;
      text-align: center;
    }
    .section-tag-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(10, 77, 104, 0.08);
      color: var(--color-primary);
      font-size: 12px;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-tag-pill.tag-dark {
      background: rgba(0, 234, 118, 0.14);
      color: var(--color-accent-green);
    }
    .section-title {
      font-size: 28px;
      letter-spacing: -0.3px;
      margin-bottom: 12px;
    }
    .section-dark .section-title { color: #FFFFFF; }
    .section-desc-lead {
      color: var(--color-text-muted);
      font-size: 15px;
      line-height: 1.75;
    }
    .section-dark .section-desc-lead { color: #94A3B8; }

    /* 首屏直播预告及沉浸展台 (Hero) */
    .hero-live-container {
      background: linear-gradient(135deg, rgba(8, 29, 41, 0.94) 0%, rgba(15, 23, 42, 0.88) 100%),
                  url('/assets/images/c48c725531bd8d8d.jpg') center/cover no-repeat;
      padding: 90px 0 100px 0;
      color: #FFFFFF;
      position: relative;
      overflow: hidden;
      border-bottom: 3px solid var(--color-accent-green);
    }
    .hero-broadcast-card {
      background: rgba(30, 41, 59, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.15);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-lg);
    }
    .live-badge-glow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #EF4444;
      color: #FFF;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 16px;
      animation: pulseAlert 2s infinite;
    }
    @keyframes pulseAlert {
      0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
      70% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
      100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
    }
    .countdown-board {
      display: flex;
      gap: 12px;
      margin: 24px 0;
    }
    .countdown-unit {
      background: rgba(15, 23, 42, 0.9);
      border: 1px solid var(--color-border-dark);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      min-width: 68px;
      text-align: center;
    }
    .countdown-num {
      display: block;
      font-size: 24px;
      font-weight: 800;
      color: var(--color-accent-green);
      line-height: 1.1;
    }
    .countdown-label {
      font-size: 11px;
      color: #94A3B8;
    }
    .btn-hero-primary {
      background: var(--color-accent-green);
      color: #082F1E !important;
      font-weight: 700;
      padding: 12px 26px;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 4px 16px rgba(0, 234, 118, 0.3);
    }
    .btn-hero-primary:hover {
      background: #00D36A;
      transform: translateY(-2px);
    }
    .btn-hero-secondary {
      background: rgba(255, 255, 255, 0.12);
      color: #FFF !important;
      border: 1px solid rgba(255, 255, 255, 0.25);
      font-weight: 600;
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-left: 12px;
    }
    .btn-hero-secondary:hover {
      background: rgba(255, 255, 255, 0.2);
    }

    /* 卡片与网格通用 */
    .feature-card-clean {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      height: 100%;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-standard);
      position: relative;
    }
    .feature-card-clean:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(10, 77, 104, 0.3);
    }
    .icon-box-tech {
      width: 50px;
      height: 50px;
      background: rgba(10, 77, 104, 0.06);
      color: var(--color-primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
    }
    .feature-card-clean:hover .icon-box-tech {
      background: var(--color-primary);
      color: var(--color-accent-green);
    }

    /* 旗舰产品展示 */
    .product-spec-card {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-standard);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .product-spec-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .product-img-wrap {
      position: relative;
      height: 220px;
      background: #F1F5F9;
      overflow: hidden;
    }
    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-spec-card:hover .product-img-wrap img {
      transform: scale(1.05);
    }
    .product-model-tag {
      position: absolute;
      top: 12px;
      right: 12px;
      background: rgba(15, 23, 42, 0.85);
      color: var(--color-accent-green);
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
    }
    .product-body-content {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .spec-item-list {
      list-style: none;
      margin: 14px 0 20px 0;
      font-size: 13px;
      color: var(--color-text-muted);
    }
    .spec-item-list li {
      padding: 5px 0;
      border-bottom: 1px dashed var(--color-border);
      display: flex;
      justify-content: space-between;
    }
    .spec-item-list li span:last-child {
      color: var(--color-text-main);
      font-weight: 600;
    }

    /* 深色沉浸算法架构 */
    .dark-logic-card {
      background: var(--color-bg-card-dark);
      border: 1px solid var(--color-border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      height: 100%;
    }
    .logic-code-pill {
      font-family: Consolas, monospace;
      color: var(--color-accent-green);
      font-size: 12px;
      background: rgba(0, 0, 0, 0.4);
      padding: 4px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 流程步进条 */
    .step-flow-wrap {
      position: relative;
    }
    .step-card-item {
      position: relative;
      text-align: center;
      padding: 20px 14px;
    }
    .step-badge-num {
      width: 44px;
      height: 44px;
      line-height: 44px;
      background: var(--color-primary);
      color: var(--color-accent-green);
      font-weight: 800;
      font-size: 18px;
      border-radius: 50%;
      margin: 0 auto 16px auto;
      box-shadow: 0 0 0 6px rgba(10, 77, 104, 0.12);
    }

    /* 核心数据条 (Key Metrics) */
    .metrics-bar-section {
      background: var(--color-primary-dark);
      color: #FFFFFF;
      padding: 50px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .metric-value-huge {
      font-size: 40px;
      font-weight: 900;
      color: var(--color-accent-green);
      letter-spacing: -1px;
      line-height: 1.1;
    }
    .metric-title-sub {
      font-size: 13px;
      color: #CBD5E1;
      margin-top: 6px;
    }

    /* 常见问题手风琴 */
    .faq-accordion-custom .accordion-item {
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-accordion-custom .accordion-title {
      font-weight: 700;
      font-size: 15px;
      color: var(--color-primary-dark);
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #FFF;
    }
    .faq-accordion-custom .accordion-title::after {
      content: "\f078";
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      font-size: 13px;
      transition: transform 0.3s ease;
    }
    .faq-accordion-custom .is-active > .accordion-title::after {
      transform: rotate(180deg);
      color: var(--color-accent-orange);
    }
    .faq-accordion-custom .accordion-content {
      padding: 0 24px 20px 24px;
      color: var(--color-text-main);
      font-size: 14px;
      line-height: 1.8;
      border-top: none;
    }

    /* 转化区与表单 */
    .cta-floating-box {
      background: linear-gradient(135deg, #0A4D68 0%, #08293B 100%);
      border-radius: var(--radius-lg);
      padding: 44px;
      color: #FFFFFF;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    .cta-input-style {
      height: 48px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.3);
      background: rgba(255, 255, 255, 0.08);
      color: #FFF !important;
      padding: 0 16px;
      margin-bottom: 12px;
    }
    .cta-input-style::placeholder { color: #94A3B8; }
    .cta-input-style:focus {
      background: rgba(255, 255, 255, 0.15);
      border-color: var(--color-accent-green);
      outline: none;
      box-shadow: none;
    }
    .btn-submit-action {
      background: var(--color-accent-orange);
      color: #FFF;
      font-weight: 700;
      height: 48px;
      border-radius: var(--radius-sm);
      border: none;
      width: 100%;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(255, 107, 53, 0.35);
      transition: var(--transition-standard);
    }
    .btn-submit-action:hover {
      background: #E85A26;
      transform: translateY(-2px);
    }

    /* 页脚 */
    .site-footer-dark {
      background: #081622;
      color: #94A3B8;
      padding: 60px 0 30px 0;
      font-size: 13px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-heading {
      color: #F1F5F9;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 18px;
      letter-spacing: 0.5px;
    }
    .footer-list-links {
      list-style: none;
      margin: 0;
    }
    .footer-list-links li { margin-bottom: 10px; }
    .footer-list-links a { color: #94A3B8; }
    .footer-list-links a:hover { color: var(--color-accent-green); }
    .footer-bottom-row {
      margin-top: 48px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      text-align: center;
      font-size: 12px;
    }

    /* 移动端断点适配 */
    @media screen and (max-width: 1024px) {
      .nav-links-menu { gap: 14px; }
      .nav-links-menu a { font-size: 13px; }
    }
    @media screen and (max-width: 768px) {
      .top-meta-bar { display: none; }
      .mobile-menu-trigger { display: block; }
      .nav-links-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        border-bottom: 2px solid var(--color-primary);
      }
      .nav-links-menu.is-active { display: flex; }
      .countdown-board { justify-content: center; }
      .section-title { font-size: 22px; }
      .site-section { padding: 56px 0; }
      .cta-floating-box { padding: 24px; }
      .btn-hero-secondary { margin-left: 0; margin-top: 12px; }
    }