/* roulang page: index */
:root {
      --primary: #E43D2A;
      --primary-deep: #C83224;
      --secondary: #1E1F24;
      --accent-gold: #F0B87A;
      --bg-white: #FAFAFA;
      --bg-cloud: #F2F1EF;
      --card-bg: #FFFFFF;
      --border-light: #EAEBED;
      --text-main: #1E1F24;
      --text-secondary: #6B6F76;
      --text-muted: #9A9DA3;
      --white: #FFFFFF;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-sm: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", system-ui, -apple-system, sans-serif;
      --transition: 0.25s ease;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      color: var(--secondary);
    }

    h1 {
      font-size: clamp(2.2rem, 5vw, 2.75rem);
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: clamp(1.8rem, 4vw, 2rem);
      line-height: 1.3;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.25rem;
      font-weight: 500;
      line-height: 1.4;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .section-title h2 {
      margin-bottom: 0.75rem;
    }

    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      max-width: 600px;
      margin: 0 auto;
    }

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

    a:hover {
      color: var(--primary-deep);
      text-decoration: underline;
    }

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

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      font-family: var(--font-sans);
      text-decoration: none;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.85rem 2rem;
      font-size: 1rem;
      box-shadow: 0 4px 10px rgba(228,61,42,0.25);
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      color: white;
      transform: translateY(-2px);
      box-shadow: 0 12px 20px rgba(228,61,42,0.3);
      text-decoration: none;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.7rem 1.8rem;
      font-size: 0.95rem;
    }

    .btn-outline:hover {
      background: rgba(228,61,42,0.08);
      border-color: var(--primary-deep);
      color: var(--primary-deep);
      text-decoration: none;
    }

    .btn-ghost {
      background: transparent;
      color: var(--text-main);
      padding: 0.5rem 1rem;
      font-weight: 500;
      border-bottom: 2px solid transparent;
      border-radius: 0;
    }

    .btn-ghost:hover {
      border-bottom-color: var(--primary);
      color: var(--primary);
      text-decoration: none;
    }

    .btn-large {
      padding: 1rem 2.8rem;
      font-size: 1.15rem;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      z-index: 40;
      border-bottom: 1px solid transparent;
      transition: box-shadow 0.3s, border-color 0.3s;
      display: flex;
      align-items: center;
    }

    .site-header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }

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

    .logo-text {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--secondary);
      letter-spacing: -0.3px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--secondary);
      text-decoration: none;
      transition: color 0.2s;
    }

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

    .nav-cta {
      margin-left: 1.5rem;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary);
    }

    /* Hero 分屏 */
    .hero-section {
      display: flex;
      align-items: center;
      min-height: 85vh;
      padding-top: 64px;
      background: var(--bg-white);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      width: 100%;
    }

    .hero-left {
      flex: 1 1 50%;
    }

    .hero-right {
      flex: 1 1 50%;
      position: relative;
    }

    .hero-image {
      width: 100%;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      transform: scale(1);
      animation: softScale 0.8s ease-out;
    }

    @keyframes softScale {
      0% { transform: scale(1.02); opacity: 0.9; }
      100% { transform: scale(1); opacity: 1; }
    }

    .hero-left h1 {
      margin-bottom: 1.5rem;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      line-height: 1.6;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      gap: 1.8rem;
      flex-wrap: wrap;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .bg-cloud {
      background-color: var(--bg-cloud);
    }

    /* 功能卡片网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

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

    .feature-icon {
      font-size: 2.6rem;
      color: var(--primary);
      margin-bottom: 1.5rem;
    }

    .feature-card h3 {
      margin-bottom: 0.8rem;
    }

    /* 场景卡片 */
    .scenario-row {
      display: flex;
      gap: 28px;
      flex-wrap: wrap;
    }

    .scenario-card {
      flex: 1 1 calc(50% - 14px);
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      border: 1px solid var(--border-light);
    }

    .scenario-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }

    .scenario-content {
      padding: 1.8rem;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      border: 1px solid var(--border-light);
      text-align: center;
    }

    .case-logo {
      font-size: 2rem;
      color: #aaa;
      margin-bottom: 1rem;
    }

    .case-number {
      font-family: var(--font-number);
      font-size: 2.3rem;
      font-weight: 700;
      color: var(--primary);
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .price-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      border: 1px solid var(--border-light);
      text-align: center;
      position: relative;
    }

    .price-card.recommended {
      border: 2px solid var(--accent-gold);
      box-shadow: 0 8px 20px rgba(240,184,122,0.15);
    }

    .badge {
      background: var(--accent-gold);
      color: #1E1F24;
      font-size: 0.8rem;
      font-weight: 700;
      padding: 0.25rem 1rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 1rem;
    }

    .price-amount {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--secondary);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--secondary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      font-size: 0.95rem;
      padding-right: 2rem;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 0.8rem;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(rgba(30,31,36,0.85), rgba(30,31,36,0.9)), url('/assets/images/backpic/back-2.webp') center/cover;
      padding: 90px 0;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .site-footer {
      background: #1E1F24;
      color: #C0C2C8;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 35px;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: repeat(2, 1fr); }
      .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .features-grid, .cases-grid, .pricing-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }