/* roulang page: index */
:root {
      --bg-dark: #0C0F12;
      --bg-deep: #070A0D;
      --bg-light: #F8FAFC;
      --card-dark: #141A21;
      --card-border: #1E293B;
      --primary: #00E599;
      --primary-hover: #00c784;
      --secondary: #0070F3;
      --accent: #FF3B30;
      --text-white: #FFFFFF;
      --text-slate: #94A3B8;
      --text-dark: #0F172A;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
      --shadow-soft: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
      --font-stack: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-dark);
      color: var(--text-slate);
      line-height: 1.75;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 1.25rem;
      }
    }

    /* 顶部双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      background: rgba(12, 15, 18, 0.92);
      border-bottom: 1px solid var(--card-border);
    }

    .top-bar {
      background: #080a0c;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.8125rem;
      color: var(--text-slate);
      padding: 0.4rem 0;
    }

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

    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.9); }
    }

    .main-nav {
      padding: 0.85rem 0;
    }

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

    .logo {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-white);
      display: flex;
      align-items: center;
      gap: 0.6rem;
      letter-spacing: -0.02em;
    }

    .logo-badge {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #050505;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 0.15rem 0.45rem;
      border-radius: 4px;
    }

    .nav-links {
      display: flex;
      gap: 1.75rem;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-slate);
      font-size: 0.9375rem;
      font-weight: 500;
    }

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

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.65rem 1.4rem;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #06110B;
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 14px rgba(0, 229, 153, 0.35);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--card-border);
      color: var(--text-white);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(0, 229, 153, 0.05);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      color: var(--text-white);
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* Section 通用布局与板式 */
    section {
      padding: 5.5rem 0;
      position: relative;
    }

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

    .section-light .section-subtitle {
      color: var(--secondary);
    }

    .section-light .section-desc {
      color: var(--text-muted);
    }

    .section-header {
      margin-bottom: 3.5rem;
      max-width: 820px;
    }

    .section-subtitle {
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      margin-bottom: 0.6rem;
      display: inline-block;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      letter-spacing: -0.03em;
      line-height: 1.25;
      margin-bottom: 1rem;
      color: var(--text-white);
    }

    .section-light .section-title {
      color: var(--text-dark);
    }

    .section-desc {
      font-size: 1.0625rem;
      line-height: 1.75;
      color: var(--text-slate);
    }

    /* 板块 1: Hero (自测问卷交互风) */
    .hero-section {
      padding: 4.5rem 0 6rem 0;
      background-color: var(--bg-dark);
      background-image: linear-gradient(180deg, rgba(12, 15, 18, 0.75) 0%, rgba(12, 15, 18, 0.95) 100%), url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-bottom: 1px solid var(--card-border);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 3.5rem;
      align-items: center;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background: rgba(0, 229, 153, 0.1);
      border: 1px solid rgba(0, 229, 153, 0.25);
      color: var(--primary);
      padding: 0.35rem 0.9rem;
      border-radius: 9999px;
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
    }

    .hero-title {
      font-size: 3rem;
      line-height: 1.15;
      font-weight: 800;
      color: var(--text-white);
      margin-bottom: 1.25rem;
      letter-spacing: -0.03em;
    }

    .hero-title span {
      background: linear-gradient(135deg, #FFFFFF 30%, var(--primary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-summary {
      font-size: 1.0625rem;
      line-height: 1.75;
      color: var(--text-slate);
      margin-bottom: 2rem;
      max-width: 620px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
    }

    .hero-eval-card {
      background: rgba(20, 26, 33, 0.85);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      padding: 2rem;
      box-shadow: var(--shadow-soft);
      backdrop-filter: blur(16px);
    }

    .eval-card-header {
      margin-bottom: 1.25rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .eval-card-header h3 {
      font-size: 1.125rem;
      color: var(--text-white);
      margin-bottom: 0.35rem;
    }

    .eval-form-group {
      margin-bottom: 1rem;
    }

    .eval-form-group label {
      display: block;
      font-size: 0.8125rem;
      color: var(--text-slate);
      margin-bottom: 0.4rem;
    }

    .eval-select, .eval-input {
      width: 100%;
      background: #090C0F;
      border: 1px solid #2A3649;
      border-radius: 6px;
      color: var(--text-white);
      padding: 0.65rem 0.85rem;
      font-size: 0.875rem;
      outline: none;
    }

    .eval-select:focus, .eval-input:focus {
      border-color: var(--primary);
    }

    .eval-result-preview {
      margin-top: 1.25rem;
      padding: 1rem;
      background: rgba(0, 229, 153, 0.04);
      border: 1px dashed rgba(0, 229, 153, 0.3);
      border-radius: 6px;
      font-size: 0.8125rem;
      color: var(--text-slate);
    }

    .eval-result-row {
      display: flex;
      justify-content: space-between;
      margin-bottom: 0.35rem;
    }

    .eval-result-row strong {
      color: var(--primary);
    }

    /* 板块 2: 行业痛点破局与产品定位 (#problem-solution) */
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
    }

    .compare-box {
      border-radius: 12px;
      padding: 2.5rem;
      border: 1px solid var(--card-border);
    }

    .box-legacy {
      background: #11151A;
    }

    .box-cloud {
      background: #141C24;
      border-color: rgba(0, 229, 153, 0.3);
    }

    .compare-title {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      display: flex;
      align-items: center;
      gap: 0.6rem;
    }

    .title-legacy { color: #F87171; }
    .title-cloud { color: var(--primary); }

    .compare-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
    }

    .compare-item h4 {
      font-size: 1rem;
      color: var(--text-white);
      margin-bottom: 0.3rem;
    }

    .compare-item p {
      font-size: 0.875rem;
      color: var(--text-slate);
      line-height: 1.6;
    }

    /* 板块 3: 核心优势网格区 (#advantages) */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }

    .feature-card {
      background: var(--card-dark);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      padding: 2rem;
      transition: transform 0.25s ease, border-color 0.25s ease;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 229, 153, 0.4);
    }

    .feature-icon-bar {
      width: 44px;
      height: 44px;
      background: rgba(0, 229, 153, 0.1);
      color: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.15rem;
      margin-bottom: 1.25rem;
    }

    .feature-card h3 {
      font-size: 1.15rem;
      color: var(--text-white);
      margin-bottom: 0.6rem;
    }

    .feature-card p {
      font-size: 0.9rem;
      line-height: 1.65;
      color: var(--text-slate);
    }

    .feature-tag {
      margin-top: 1.25rem;
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--secondary);
      background: rgba(0, 112, 243, 0.1);
      padding: 0.2rem 0.5rem;
      border-radius: 4px;
    }

    /* 板块 4: 热门服务规格矩阵 (#products) - 浅色穿插 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .pricing-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      padding: 2.5rem;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .pricing-card.featured {
      border: 2px solid var(--primary);
      transform: scale(1.03);
    }

    .featured-tag {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--primary);
      color: #06110B;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.2rem 0.6rem;
      border-radius: 4px;
    }

    .plan-name {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 0.5rem;
    }

    .plan-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 1.5rem;
      min-height: 48px;
    }

    .plan-features {
      list-style: none;
      margin-bottom: 2rem;
      flex-grow: 1;
    }

    .plan-features li {
      font-size: 0.9rem;
      color: #334155;
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .plan-features li::before {
      content: "✓";
      color: #059669;
      font-weight: bold;
    }

    .itu-spec-box {
      margin-top: 3.5rem;
      background: #FFFFFF;
      border-left: 4px solid var(--secondary);
      padding: 1.25rem 1.75rem;
      border-radius: 0 8px 8px 0;
      font-size: 0.9rem;
      color: #475569;
    }

    /* 板块 5: 云原生视讯架构区 (#technology) - 超深墨黑对比 */
    .tech-section {
      background-color: var(--bg-deep);
      border-top: 1px solid var(--card-border);
      border-bottom: 1px solid var(--card-border);
    }

    .tech-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }

    .tech-points {
      display: flex;
      flex-direction: column;
      gap: 1.75rem;
    }

    .tech-item h4 {
      font-size: 1.15rem;
      color: var(--text-white);
      margin-bottom: 0.4rem;
    }

    .tech-item p {
      font-size: 0.9rem;
      color: var(--text-slate);
      line-height: 1.7;
    }

    .tech-visual-board {
      background: #0E1318;
      border: 1px solid #1E293B;
      border-radius: 12px;
      padding: 1.5rem;
      position: relative;
    }

    .mock-stream-line {
      display: flex;
      justify-content: space-between;
      padding: 0.75rem;
      background: #141A21;
      border-radius: 6px;
      margin-bottom: 0.75rem;
      font-size: 0.8125rem;
      font-family: monospace;
    }

    .stream-status-ok {
      color: var(--primary);
    }

    /* 板块 6: 4步工作流全景 (#workflow) */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      position: relative;
    }

    .flow-step-card {
      background: var(--card-dark);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      padding: 1.75rem;
      position: relative;
    }

    .step-num {
      font-size: 2rem;
      font-weight: 800;
      color: rgba(0, 229, 153, 0.25);
      line-height: 1;
      margin-bottom: 1rem;
    }

    .flow-step-card h3 {
      font-size: 1.0625rem;
      color: var(--text-white);
      margin-bottom: 0.5rem;
    }

    .flow-step-card p {
      font-size: 0.875rem;
      color: var(--text-slate);
      line-height: 1.6;
    }

    /* 板块 7: 标杆场景案例 (#stories) */
    .story-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }

    .story-card {
      background: var(--card-dark);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .story-img-wrap {
      width: 100%;
      height: 240px;
      overflow: hidden;
    }

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

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

    .story-content {
      padding: 2rem;
      flex-grow: 1;
    }

    .story-badge {
      display: inline-block;
      font-size: 0.75rem;
      color: var(--primary);
      background: rgba(0, 229, 153, 0.1);
      padding: 0.2rem 0.5rem;
      border-radius: 4px;
      margin-bottom: 0.75rem;
    }

    .story-title {
      font-size: 1.25rem;
      color: var(--text-white);
      margin-bottom: 0.75rem;
    }

    .story-meta-stats {
      display: flex;
      gap: 1.5rem;
      margin-top: 1.5rem;
      padding-top: 1.25rem;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
    }

    .stat-item small {
      display: block;
      font-size: 0.75rem;
      color: var(--text-slate);
    }

    .stat-item span {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-white);
    }

    /* 板块 8: 关键数据指标统计条 (#metrics) */
    .metrics-bar {
      background: #11161C;
      border-top: 1px solid var(--card-border);
      border-bottom: 1px solid var(--card-border);
      padding: 3.5rem 0;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }

    .metric-value {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 0.5rem;
      font-feature-settings: "tnum";
    }

    .metric-label {
      font-size: 0.9375rem;
      color: var(--text-white);
      font-weight: 600;
      margin-bottom: 0.35rem;
    }

    .metric-desc {
      font-size: 0.8125rem;
      color: var(--text-slate);
    }

    /* 板块 9: 转播机构评价 (#testimonials) - 浅色 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      padding: 2.25rem;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    }

    .quote-icon {
      font-size: 2rem;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 1rem;
    }

    .testimonial-card p {
      font-size: 0.9375rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 0.85rem;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #475569;
    }

    .user-meta h4 {
      font-size: 0.9375rem;
      color: var(--text-dark);
    }

    .user-meta span {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 板块 10: 资讯专栏 (#news) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .news-card {
      background: var(--card-dark);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      padding: 2rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .news-card-date {
      font-size: 0.8125rem;
      color: var(--secondary);
      margin-bottom: 0.5rem;
    }

    .news-card h3 {
      font-size: 1.15rem;
      color: var(--text-white);
      margin-bottom: 0.75rem;
      line-height: 1.4;
    }

    .news-card p {
      font-size: 0.875rem;
      color: var(--text-slate);
      line-height: 1.6;
      margin-bottom: 1.5rem;
    }

    .news-link-btn {
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .news-link-btn:hover {
      gap: 0.75rem;
    }

    /* FAQ Section */
    .faq-section {
      padding: 6rem 0;
      background-color: var(--bg-light);
    }

    .faq-item {
      margin-bottom: 1rem;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      overflow: hidden;
      background: white;
    }

    .faq-header {
      padding: 1.25rem;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-content {
      padding: 0 1.25rem 1.25rem;
      font-size: 0.9375rem;
      color: #475569;
      line-height: 1.6;
    }

    /* Contact Section */
    .contact-section {
      padding: 6rem 0;
      background: linear-gradient(135deg, var(--bg-dark), #1A202C);
      color: var(--text-white);
      text-align: center;
    }

    .contact-card {
      max-width: 600px;
      margin: 0 auto;
      background: rgba(255,255,255,0.05);
      padding: 3rem;
      border-radius: 16px;
    }

    .form-group {
      margin-bottom: 1.25rem;
      text-align: left;
    }

    .form-input {
      width: 100%;
      padding: 0.8rem;
      background: #0C0F12;
      border: 1px solid var(--card-border);
      border-radius: 6px;
      color: white;
    }

    /* Footer */
    footer {
      background: var(--bg-deep);
      padding: 4rem 0 2rem;
      border-top: 1px solid var(--card-border);
      color: var(--text-slate);
      font-size: 0.875rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      margin-bottom: 3rem;
    }

    .footer-col h4 {
      color: var(--text-white);
      margin-bottom: 1rem;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 0.5rem;
    }

    .copyright {
      text-align: center;
      border-top: 1px solid var(--card-border);
      padding-top: 2rem;
    }

    @media (max-width: 768px) {
      .hero-grid, .compare-container, .pricing-grid, .news-grid { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
    }