/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-dark: #14312B;
      --accent: #C8944A;
      --accent-hover: #B07D38;
      --bg-light: #FAF9F6;
      --bg-white: #FFFFFF;
      --bg-dark: #0F2622;
      --text-main: #1E1E1E;
      --text-secondary: #5A5A5A;
      --text-light: #F5F5F5;
      --text-footer: #B7B7A4;
      --success: #2D6A4F;
      --warning: #D98C2E;
      --border-light: #E0DDD5;
      --border-input: #D1CDC3;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 24px rgba(26,60,52,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --transition: 0.2s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Segoe UI", sans-serif;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-stack);
      font-size: 1rem;
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-md);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, .btn {
      font-family: var(--font-stack);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all var(--transition);
      padding: 12px 28px;
      font-size: 0.95rem;
      line-height: 1.4;
      min-height: 46px;
      border: 2px solid transparent;
    }
    input {
      font-family: var(--font-stack);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 16px;
      padding-right: 16px;
    }
    .section-padding {
      padding: 80px 0;
    }
    @media (max-width: 640px) {
      .section-padding {
        padding: 48px 0;
      }
    }

    /* 导航栏 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(250,249,246,0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      z-index: 99;
      display: flex;
      align-items: center;
    }
    .nav-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px;
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.6rem;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-consult {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      font-size: 0.9rem;
    }
    .btn-consult:hover {
      background: var(--accent-hover);
      color: white;
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(200,148,74,0.3);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--primary);
      padding: 8px;
    }
    @media (max-width: 640px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(250,249,246,0.98);
        flex-direction: column;
        gap: 20px;
        padding: 24px 0;
        border-bottom: 1px solid var(--border-light);
        backdrop-filter: blur(12px);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .btn-consult.desktop-only {
        display: none;
      }
      .nav-right-mobile {
        display: flex;
        gap: 8px;
        align-items: center;
      }
    }
    @media (min-width: 641px) {
      .nav-right-mobile {
        display: none;
      }
      .btn-consult.desktop-only {
        display: inline-flex;
      }
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #1A3C34 0%, #0F2622 100%);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      padding-top: 72px;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 2px, transparent 2px, transparent 8px);
      opacity: 0.3;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero-text h1 {
      font-size: clamp(2rem, 5vw, 3.2rem);
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: 1px;
    }
    .hero-text .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 36px;
      font-weight: 400;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      border-color: var(--accent);
      box-shadow: 0 4px 14px rgba(200,148,74,0.4);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      border-color: var(--accent-hover);
      color: white;
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      color: white;
      border: 2px solid rgba(255,255,255,0.5);
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: white;
      color: white;
    }
    .hero-image {
      flex: 1 1 400px;
      text-align: center;
    }
    .hero-image img {
      max-height: 420px;
      width: auto;
      margin: 0 auto;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.3));
      border-radius: var(--radius-lg);
    }
    @media (max-width: 840px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text {
        flex: 1 1 auto;
      }
      .btn-group {
        justify-content: center;
      }
    }

    /* 区块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary);
      display: inline-block;
      position: relative;
      padding-bottom: 16px;
    }
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 48px;
      height: 3px;
      background: var(--accent);
      border-radius: 2px;
    }
    @media (max-width: 640px) {
      .section-title h2 {
        font-size: 1.8rem;
      }
    }

    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--bg-white);
      padding: 32px 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
      text-align: center;
      position: relative;
      overflow: hidden;
      border-bottom: 3px solid transparent;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
      border-bottom-color: var(--primary);
    }
    .feature-icon {
      width: 56px;
      height: 56px;
      margin: 0 auto 20px;
      color: var(--accent);
      font-size: 2.2rem;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .feature-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    @media (max-width: 840px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景图文交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 60px;
      flex-wrap: wrap;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1 1 45%;
    }
    .scenario-img img {
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      width: 100%;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .scenario-text {
      flex: 1 1 45%;
    }
    .scenario-text h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--primary);
    }
    .scenario-list {
      list-style: none;
      margin-top: 12px;
    }
    .scenario-list li {
      padding-left: 24px;
      position: relative;
      margin-bottom: 10px;
      color: var(--text-secondary);
    }
    .scenario-list li::before {
      content: '';
      position: absolute;
      left: 0;
      top: 10px;
      width: 10px;
      height: 10px;
      background: var(--accent);
      border-radius: 2px;
      transform: rotate(45deg);
    }
    @media (max-width: 768px) {
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
    }

    /* 案例卡片滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      flex-wrap: nowrap;
    }
    .case-card {
      min-width: 280px;
      max-width: 320px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--card-shadow);
      scroll-snap-align: start;
      flex-shrink: 0;
    }
    .case-logo {
      height: 36px;
      margin-bottom: 16px;
      filter: grayscale(1);
      opacity: 0.8;
      transition: all var(--transition);
    }
    .case-card:hover .case-logo {
      filter: grayscale(0);
      opacity: 1;
    }
    .case-stats {
      font-family: var(--font-number);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
      margin: 8px 0;
    }
    .case-quote {
      font-style: italic;
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    @media (max-width: 640px) {
      .cases-scroll {
        flex-direction: column;
        overflow-x: visible;
      }
      .case-card {
        max-width: 100%;
        min-width: auto;
      }
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 36px 24px;
      text-align: center;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      position: relative;
      transition: all 0.3s ease;
    }
    .pricing-card.featured {
      border-color: var(--primary);
      transform: scale(1.03);
      box-shadow: var(--card-shadow-hover);
    }
    .pricing-card.featured::before {
      content: '推荐方案';
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent);
      color: white;
      padding: 4px 20px;
      border-radius: 0 0 8px 8px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .price {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      margin: 20px 0 8px;
    }
    .price span {
      font-size: 1rem;
      font-weight: 400;
      color: var(--text-secondary);
    }
    .pricing-features {
      list-style: none;
      margin: 24px 0;
      text-align: left;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }
    .pricing-features li {
      margin-bottom: 10px;
      padding-left: 22px;
      position: relative;
    }
    .pricing-features li i {
      position: absolute;
      left: 0;
      color: var(--success);
    }
    @media (max-width: 840px) {
      .pricing-grid {
        grid-template-columns: 1fr 1fr;
      }
      .pricing-card.featured {
        transform: none;
      }
    }
    @media (max-width: 520px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 0;
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-icon {
      color: var(--accent);
      font-size: 1.3rem;
      transition: transform 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F5F3EE;
      border-radius: 6px;
      margin-bottom: 8px;
      padding: 0 16px;
    }
    .faq-answer p {
      padding: 12px 0;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA横幅 */
    .cta-banner {
      background: var(--primary);
      text-align: center;
      padding: 60px 16px;
      color: white;
      border-radius: 0;
    }
    .cta-banner h2 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 24px auto 0;
      gap: 8px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-form input {
      flex: 1 1 240px;
      padding: 12px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-input);
      background: white;
    }
    .cta-form button {
      background: var(--accent);
      color: white;
      border: none;
    }

    /* 页脚 */
    #footer {
      background: var(--bg-dark);
      color: var(--text-footer);
      padding: 48px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-col a {
      display: block;
      color: var(--text-footer);
      margin-bottom: 10px;
      font-size: 0.9rem;
    }
    .footer-col a:hover {
      color: var(--accent);
    }
    .social-icons i {
      font-size: 1.3rem;
      margin-right: 16px;
      color: var(--text-footer);
      transition: color 0.2s;
    }
    .social-icons i:hover {
      color: var(--accent);
    }
    .copyright {
      text-align: center;
      font-size: 0.85rem;
      color: #6A6A6A;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 480px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }