/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --bg-deep: #0B0E14;
      --bg-card: #151A23;
      --bg-light-section: #1C212B;
      --bg-darker: #0F131A;
      --primary-gold: #F0B35B;
      --accent-purple: #4A4E69;
      --accent-teal: #7EC8C8;
      --text-primary: #EAECF0;
      --text-secondary: #9CA0AD;
      --text-muted: #5C6072;
      --border-light: #2A2E3A;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-large: 16px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 8px 32px rgba(240,179,91,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
      --transition-default: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 640px) {
      .container-custom {
        padding: 0 20px;
      }
    }

    /* 导航样式 - 资讯门户吸顶 */
    .xk-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
      border-bottom: 1px solid transparent;
    }

    .xk-nav.scrolled {
      background: rgba(11, 14, 20, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 6px 20px rgba(0,0,0,0.5);
      border-bottom: 1px solid var(--border-light);
    }

    .nav-brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
      transition: padding 0.3s ease;
    }

    .scrolled .nav-brand-row {
      padding: 8px 0;
    }

    .logo-text {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: #fff;
      line-height: 1.2;
    }

    .logo-text .xk-highlight {
      color: var(--primary-gold);
      font-size: 2.4rem;
      margin-left: 2px;
      text-shadow: 0 0 8px rgba(240,179,91,0.3);
    }

    .trend-tags {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
    }

    .trend-tag {
      background: rgba(74, 78, 105, 0.3);
      color: var(--accent-purple-light, #C5C8D4);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      white-space: nowrap;
      border: 1px solid rgba(74,78,105,0.5);
      transition: all 0.2s;
      cursor: default;
    }

    .search-icon {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-left: 8px;
      cursor: pointer;
      transition: color 0.2s;
    }

    .search-icon:hover {
      color: var(--primary-gold);
    }

    .channel-row {
      display: flex;
      align-items: center;
      gap: 28px;
      padding: 8px 0 14px;
      flex-wrap: wrap;
      transition: all 0.3s ease;
    }

    .scrolled .channel-row {
      padding: 4px 0 8px;
      gap: 24px;
    }

    .channel-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .channel-link.active,
    .channel-link:hover {
      color: var(--primary-gold);
    }

    .channel-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-gold);
      border-radius: 1px;
    }

    /* 移动端导航菜单 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 1.8rem;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .channel-row {
        display: none;
        flex-direction: column;
        background: var(--bg-deep);
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 20px;
        border-bottom: 1px solid var(--border-light);
      }
      .channel-row.mobile-open {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .trend-tags {
        display: none;
      }
    }

    /* Hero 区块 */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0B0E14 0%, #1A1F2B 100%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .stars-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-left {
      flex: 7;
    }

    .hero-right {
      flex: 5;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      color: #fff;
      margin-bottom: 1.2rem;
      letter-spacing: 0.5px;
    }

    .hero-subtitle {
      font-size: 1.3rem;
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
      max-width: 550px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-gold);
      color: #0B0E14;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1rem;
      transition: all 0.25s ease;
      cursor: pointer;
      display: inline-block;
    }

    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 0 1px var(--accent-teal);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary-gold);
      color: var(--primary-gold);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      cursor: pointer;
      display: inline-block;
    }

    .btn-secondary:hover {
      background: rgba(240, 179, 91, 0.1);
      border-color: #f5c982;
    }

    .hero-visual {
      width: 100%;
      max-width: 420px;
      aspect-ratio: 1/1;
      background: radial-gradient(circle at 30% 30%, rgba(240,179,91,0.2), transparent 70%);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 40px rgba(240,179,91,0.1);
    }

    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        flex: unset;
        width: 100%;
      }
      .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
      }
      .btn-group {
        justify-content: center;
      }
      .hero-title {
        font-size: 2.5rem;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 2rem;
      }
      .hero-subtitle {
        font-size: 1rem;
      }
      .hero-visual {
        max-width: 280px;
      }
    }

    /* 通用区块标题 */
    .section-title {
      font-size: 2.4rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: #fff;
    }

    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    /* 痛点区块 */
    .pain-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .pain-card {
      background: var(--bg-light-section);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: all 0.3s;
      border-left: 4px solid var(--accent-purple);
    }

    .pain-card.small-card {
      border-left: none;
      border-top: 3px solid var(--accent-purple);
    }

    .pain-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 14px;
    }

    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案交替图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 80px;
    }

    .solution-row.reverse {
      flex-direction: row-reverse;
    }

    .solution-text {
      flex: 1;
    }

    .solution-image {
      flex: 1;
      background: #1C212B;
      border-radius: var(--radius-large);
      overflow: hidden;
      min-height: 280px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .capability-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .cap-tag {
      background: rgba(74,78,105,0.4);
      color: #d0d3db;
      padding: 5px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
    }

    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }

    /* 数据卡片横向滚动 */
    .data-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
      scrollbar-width: thin;
    }

    .data-card {
      background: var(--bg-light-section);
      border-radius: var(--radius-large);
      padding: 28px 32px;
      min-width: 200px;
      text-align: center;
      flex-shrink: 0;
    }

    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-gold);
    }

    /* 客户证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
    }

    .testimonial-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    @media (max-width: 768px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid var(--accent-purple);
    }

    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-question {
      border-left-color: var(--accent-teal);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    @media (max-width: 640px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA 区块 */
    .cta-block {
      background: var(--bg-light-section);
      border-radius: var(--radius-large);
      padding: 60px 40px;
      text-align: center;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    section {
      padding: 120px 0;
    }

    @media (max-width: 640px) {
      section {
        padding: 80px 0;
      }
    }