/* roulang page: index */
/* ----- 设计变量 & 基础重置 ----- */
    :root {
      --primary: #1A56DB;
      --primary-hover: #153EB0;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --bg-page: #FAFBFD;
      --bg-card: #FFFFFF;
      --bg-card-hover: #F0F4FF;
      --bg-faq-section: #F1F5F9;
      --text-heading: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-on-primary: #FFFFFF;
      --text-on-accent: #FFFFFF;
      --border-light: #E2E8F0;
      --border-medium: #CBD5E1;
      --success: #059669;
      --error: #DC2626;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-md: 0 10px 25px rgba(26,86,219,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Mono", "Menlo", monospace;
      --transition: all 0.2s ease;
      --max-width: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--header-height);
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 容器 */
    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 板块间距 */
    .section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      .section {
        padding: 60px 0;
      }
      :root {
        --header-height: 64px;
      }
    }

    /* ----- 导航栏 (分段标签风格) ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      white-space: nowrap;
    }
    .logo span {
      color: var(--text-heading);
      font-weight: 400;
      font-size: 16px;
      margin-left: 4px;
    }

    .nav-links {
      display: flex;
      gap: 8px;
    }

    .nav-chip {
      padding: 8px 18px;
      border-radius: var(--radius-chip);
      background: #F1F5F9;
      color: var(--text-body);
      font-weight: 500;
      font-size: 15px;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-chip:hover {
      background: #E2E8F0;
      color: var(--text-heading);
    }
    .nav-chip.active {
      background: var(--primary);
      color: white;
    }

    .header-cta {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      white-space: nowrap;
      transition: var(--transition);
    }
    .header-cta:hover {
      background: var(--accent-hover);
    }

    .hamburger {
      display: none;
      font-size: 26px;
      background: none;
      border: none;
      color: var(--text-heading);
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
        margin-left: auto;
        margin-right: 16px;
      }
    }
    @media (max-width: 640px) {
      .header-cta {
        padding: 8px 18px;
        font-size: 14px;
      }
      .logo {
        font-size: 18px;
      }
    }

    /* 移动端菜单浮层 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(8px);
      z-index: 60;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 24px;
      transform: translateY(-100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu.open {
      transform: translateY(0);
    }
    .mobile-menu a {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-heading);
      padding: 8px 20px;
    }
    .close-menu {
      position: absolute;
      top: 20px;
      right: 24px;
      font-size: 32px;
      background: none;
      border: none;
      color: var(--text-heading);
    }

    /* ----- Hero ----- */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-heading);
      margin-bottom: 20px;
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 28px;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      transition: var(--transition);
      border: none;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: #F0F4FF;
    }
    .trust-text {
      font-size: 14px;
      color: var(--text-muted);
    }
    .hero-image img {
      border-radius: 16px;
      box-shadow: var(--shadow-md);
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-text h1 {
        font-size: 32px;
      }
      .hero-text .subtitle {
        font-size: 16px;
      }
    }

    /* ----- 通用卡片网格 ----- */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .cards-grid.col4 {
      grid-template-columns: repeat(4, 1fr);
    }
    @media (max-width: 1024px) {
      .cards-grid.col4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .cards-grid, .cards-grid.col4 {
        grid-template-columns: 1fr;
      }
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--border-medium);
      background: var(--bg-card-hover);
      transform: translateY(-4px);
    }
    .card h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 12px;
    }
    .card p {
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 解决方案卡片图片 */
    .card-img {
      width: 100%;
      aspect-ratio: 3/2;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 16px;
    }

    /* ----- 痛點裝飾條 ----- */
    .pain-card {
      position: relative;
      overflow: hidden;
    }
    .pain-card::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 4px;
      background: var(--accent);
      border-radius: 2px;
    }

    /* ----- 数据成果区块 ----- */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      margin-bottom: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 42px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 16px;
      margin-top: 8px;
    }

    .scoreboard {
      background: #F8FAFC;
      border-radius: var(--radius-card);
      padding: 20px;
    }
    .score-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .team-name {
      font-weight: 600;
      color: var(--text-heading);
    }
    .score-digit {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent);
      margin: 0 12px;
    }
    .status-chip {
      background: #E2E8F0;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-body);
    }
    .status-chip.live {
      background: #FEF3C7;
      color: #B45309;
    }

    /* ----- 证言卡片 ----- */
    .testimonial-card {
      border-left: 4px solid var(--primary);
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-block {
      background: var(--bg-faq-section);
      border-radius: var(--radius-card);
      padding: 40px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-heading);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      padding-left: 12px;
      border-left: 3px solid transparent;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
      border-left-color: var(--primary);
    }

    /* ----- CTA 横幅 ----- */
    .cta-banner {
      background: var(--primary);
      border-radius: var(--radius-card);
      text-align: center;
      padding: 64px 24px;
      color: white;
    }
    .cta-banner h2 {
      color: white;
    }
    .btn-cta-large {
      background: var(--accent);
      color: white;
      padding: 16px 40px;
      font-size: 18px;
      font-weight: 700;
      border-radius: var(--radius-btn);
      margin-top: 24px;
      display: inline-block;
      transition: var(--transition);
    }
    .btn-cta-large:hover {
      background: white;
      color: var(--accent);
    }

    /* ----- 页脚 ----- */
    .site-footer {
      background: #0F172A;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }
    .copyright {
      margin-top: 40px;
      text-align: center;
      color: #94A3B8;
      font-size: 14px;
    }

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

    /* 辅助标题 */
    h2 {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-subtitle {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 18px;
    }