/* roulang page: index */
:root {
      --primary: #1d4ed8;
      --primary-dark: #0f172a;
      --primary-light: #3b82f6;
      --accent: #10b981;
      --accent-cyan: #06b6d4;
      --danger: #ef4444;
      --warning: #f59e0b;
      --bg-page: #f8fafc;
      --bg-white: #ffffff;
      --bg-dark: #0b132b;
      --bg-dark-card: #151e3f;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #94a3b8;
      --border-color: #e2e8f0;
      --card-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
      --card-shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, select, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部微栏与导航 */
    .top-bar {
      background: #0f172a;
      color: #94a3b8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #e2e8f0;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent);
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
      70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
      100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .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-dark);
      letter-spacing: -0.5px;
    }
    .logo-symbol {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 800;
      font-size: 20px;
      box-shadow: 0 4px 10px rgba(29, 78, 216, 0.25);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-item a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 6px 0;
    }
    .nav-item a:hover,
    .nav-item.active a {
      color: var(--primary);
    }
    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--primary);
      color: #fff;
      font-size: 14px;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--primary);
      cursor: pointer;
      min-height: 44px;
      min-width: 44px;
    }
    .nav-cta:hover {
      background-color: #1e40af;
      box-shadow: 0 4px 12px rgba(29, 78, 216, 0.2);
    }

    /* 通用板块与排版 */
    .section-spacing {
      padding: 88px 0;
      position: relative;
    }
    .section-spacing-alt {
      background-color: var(--bg-white);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      margin-bottom: 56px;
      max-width: 800px;
    }
    .section-header.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 9999px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 16px;
      background-color: rgba(29, 78, 216, 0.08);
      color: var(--primary);
      border: 1px solid rgba(29, 78, 216, 0.15);
    }
    .badge-accent {
      background-color: rgba(16, 185, 129, 0.1);
      color: #059669;
      border-color: rgba(16, 185, 129, 0.2);
    }
    .badge-cyan {
      background-color: rgba(6, 182, 212, 0.1);
      color: #0891b2;
      border-color: rgba(6, 182, 212, 0.2);
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 1: Hero 对比选型与推荐档前置 */
    .hero-section {
      padding: 64px 0 88px;
      background: radial-gradient(circle at 10% 20%, rgba(29, 78, 216, 0.04) 0%, rgba(248, 250, 252, 1) 90%), url('/assets/images/31be2afc6afecfe4.webp') no-repeat center center / cover;
      position: relative;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(248, 250, 252, 0.94);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-header-box {
      max-width: 900px;
      margin-bottom: 48px;
    }
    .hero-title {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.22;
      color: var(--primary-dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-title span {
      background: linear-gradient(120deg, var(--primary), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 28px;
    }
    .hero-tiers-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }
    .tier-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      position: relative;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .tier-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    .tier-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 12px 30px -5px rgba(29, 78, 216, 0.15);
      background: #ffffff;
    }
    .featured-tag {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: linear-gradient(90deg, var(--primary), #2563eb);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 9999px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .tier-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 8px;
    }
    .tier-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 20px;
      min-height: 42px;
    }
    .tier-specs {
      list-style: none;
      margin-bottom: 28px;
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }
    .tier-specs li {
      font-size: 14px;
      color: var(--text-main);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .tier-specs li::before {
      content: "✓";
      color: var(--accent);
      font-weight: 800;
      font-size: 14px;
    }
    .tier-btn {
      width: 100%;
      text-align: center;
      padding: 12px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      border: 1px solid var(--border-color);
      background: #f1f5f9;
      color: var(--text-main);
      display: block;
      cursor: pointer;
    }
    .tier-btn:hover {
      background: #e2e8f0;
    }
    .tier-card.featured .tier-btn {
      background: var(--primary);
      border-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(29, 78, 216, 0.25);
    }
    .tier-card.featured .tier-btn:hover {
      background: #1e40af;
    }

    /* 板块 2: 内容日历 */
    .calendar-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .calendar-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      border-top: 4px solid var(--primary);
      transition: var(--transition);
    }
    .calendar-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .calendar-card.active {
      border-top-color: var(--accent);
    }
    .calendar-time {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      margin-bottom: 8px;
    }
    .calendar-card.active .calendar-time {
      color: var(--accent);
    }
    .calendar-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 10px;
    }
    .calendar-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 3: 热门专题 */
    .topics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .topic-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .topic-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .topic-img-wrap {
      height: 180px;
      overflow: hidden;
      background: #e2e8f0;
    }
    .topic-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .topic-card:hover .topic-img-wrap img {
      transform: scale(1.04);
    }
    .topic-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .topic-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 10px;
    }
    .topic-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .topic-footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: var(--text-light);
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    /* 板块 4: 观点解读 */
    .insights-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .insight-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 30px;
      display: flex;
      align-items: center;
      gap: 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .insight-item:hover {
      border-color: rgba(29, 78, 216, 0.3);
      box-shadow: var(--card-shadow-hover);
    }
    .insight-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary-light);
      opacity: 0.7;
      min-width: 50px;
    }
    .insight-content {
      flex: 1;
    }
    .insight-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 6px;
    }
    .insight-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 5: 资讯精选 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .news-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 12px;
    }
    .news-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .news-excerpt {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 6: 媒体精选 (深色高对比工业级理念) */
    .dark-showcase-section {
      background-color: var(--bg-dark);
      color: #fff;
      padding: 96px 0;
      position: relative;
    }
    .dark-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .dark-title {
      color: #fff;
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .dark-desc {
      color: #94a3b8;
      font-size: 15px;
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .dark-spec-row {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .dark-spec-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      padding: 16px;
      background: var(--bg-dark-card);
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .dark-spec-icon {
      color: var(--accent-cyan);
      font-size: 18px;
      font-weight: bold;
      line-height: 1;
    }
    .dark-spec-content h4 {
      font-size: 15px;
      color: #f8fafc;
      margin-bottom: 4px;
    }
    .dark-spec-content p {
      font-size: 13px;
      color: #94a3b8;
      line-height: 1.5;
    }
    .dark-preview-box {
      background: var(--bg-dark-card);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    }
    .dark-preview-header {
      background: #080d1e;
      padding: 12px 20px;
      display: flex;
      align-items: center;
      gap: 8px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .window-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #334155;
    }
    .window-dot.red { background: #ef4444; }
    .window-dot.yellow { background: #f59e0b; }
    .window-dot.green { background: #10b981; }
    .dark-preview-body {
      padding: 0;
    }
    .dark-preview-body img {
      width: 100%;
      height: auto;
      display: block;
      filter: brightness(0.95);
    }

    /* 板块 7: 数据分析与关键指标 */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(29, 78, 216, 0.3);
    }
    .metric-number {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      letter-spacing: -1px;
    }
    .metric-label {
      font-size: 15px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 6px;
    }
    .metric-sub {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块 8: 平台保障承诺 */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .guarantee-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--card-shadow);
    }
    .guarantee-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: rgba(16, 185, 129, 0.1);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 16px;
      font-weight: bold;
    }
    .guarantee-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 8px;
    }
    .guarantee-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 9: 痛点透视 (按叙事流补充) */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .pain-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      border-top: 3px solid var(--danger);
    }
    .pain-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 10px;
    }
    .pain-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 10: 核心方法步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
            .step-num {
        font-size: 24px;
        font-weight: 800;
        color: var(--primary);
        margin-bottom: 12px;
      }
      .step-title {
        font-size: 18px;
        font-weight: 700;
        color: var(--primary-dark);
        margin-bottom: 8px;
      }
      .step-desc {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.6;
      }

      /* Footer */
      .site-footer {
        background: #0a0f1d;
        color: #94a3b8;
        padding: 80px 0 40px;
        font-size: 14px;
      }
      .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 48px;
        margin-bottom: 60px;
      }
      .footer-brand {
        display: flex;
        flex-direction: column;
        gap: 16px;
      }
      .footer-logo {
        color: #fff;
        font-size: 20px;
        font-weight: 700;
      }
      .footer-col h4 {
        color: #fff;
        margin-bottom: 20px;
        font-size: 16px;
      }
      .footer-links {
        list-style: none;
      }
      .footer-links li {
        margin-bottom: 12px;
      }
      .footer-links a:hover {
        color: #fff;
      }
      .footer-bottom {
        border-top: 1px solid #1e293b;
        padding-top: 40px;
        text-align: center;
        font-size: 13px;
      }

      /* Responsive */
      @media (max-width: 1024px) {
        .hero-tiers-grid { grid-template-columns: 1fr; }
        .calendar-timeline { grid-template-columns: repeat(2, 1fr); }
        .topics-grid { grid-template-columns: repeat(2, 1fr); }
        .footer-grid { grid-template-columns: repeat(2, 1fr); }
      }
      @media (max-width: 768px) {
        .nav-menu { display: none; }
        .section-spacing { padding: 60px 0; }
        .calendar-timeline, .topics-grid, .pain-grid, .steps-grid, .metrics-bar { grid-template-columns: 1fr; }
        .dark-grid { grid-template-columns: 1fr; }
        .footer-grid { grid-template-columns: 1fr; }
        .hero-title { font-size: 36px; }
      }