/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary: #0A3D2E;
      --primary-light: #0F4C3A;
      --accent1: #F4A261;
      --accent2: #E9C46A;
      --bg-warm: #FBF9F6;
      --white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-muted: #5C5C5C;
      --border-light: #E8E3DC;
      --shadow-sm: 0 4px 20px rgba(10,61,46,0.06);
      --shadow-hover: 0 8px 30px rgba(10,61,46,0.12);
      --radius-card: 16px;
      --radius-btn: 50px;
      --transition: 0.3s ease;
      --container-max: 1280px;
      --nav-height: 72px;
      --section-padding: 100px 0;
    }
    
    /* ----- 基础重置 ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: 'Noto Sans SC', '思源黑体', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all var(--transition);
      font-weight: 600;
    }
    
    ul, ol {
      list-style: none;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    
    /* 板块间距 */
    section {
      padding: var(--section-padding);
    }
    
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding: 0 20px;
      }
    }
    
    /* ----- 导航组件 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(251, 249, 246, 0.95);
      backdrop-filter: blur(8px);
      z-index: 1000;
      transition: box-shadow var(--transition), background var(--transition);
      display: flex;
      align-items: center;
    }
    
    .site-header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      background: rgba(251, 249, 246, 0.98);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 32px;
      color: var(--accent1);
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-link {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 8px 0;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    
    .btn-primary {
      background: var(--accent1);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(244,162,97,0.3);
    }
    .btn-primary:hover {
      background: var(--accent2);
      box-shadow: 0 6px 18px rgba(233,196,106,0.5);
      transform: scale(1.03);
    }
    
    .ham-btn {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
    }
    
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 400px;
      height: 100vh;
      background: var(--bg-warm);
      box-shadow: -5px 0 30px rgba(0,0,0,0.08);
      z-index: 1100;
      transition: right 0.4s ease;
      display: flex;
      flex-direction: column;
      padding: 32px 24px;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-close {
      align-self: flex-end;
      font-size: 32px;
      background: none;
      border: none;
      color: var(--primary);
      margin-bottom: 40px;
    }
    .mobile-nav-links {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }
    .mobile-nav-links a {
      font-size: 20px;
      font-weight: 500;
      color: var(--text-main);
      border-bottom: 1px solid var(--border-light);
      padding-bottom: 12px;
    }
    
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .ham-btn {
        display: block;
      }
      .header-inner {
        padding: 0 20px;
      }
    }
    
    /* ----- 通用标题 ----- */
    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 28px;
      }
      .section-subtitle {
        font-size: 16px;
      }
    }
    
    /* ----- Hero ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A3D2E 0%, #0F4C3A 100%);
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
      color: white;
    }
    .hero-bg-pattern {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 30% 40%, rgba(233,196,106,0.08) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      margin: 0 auto;
      text-align: center;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      color: white;
    }
    .hero h1 span {
      color: var(--accent2);
    }
    .hero p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 40px;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-outline-white {
      border: 2px solid white;
      color: white;
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
    }
    .btn-outline-white:hover {
      background: white;
      color: var(--primary);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 28px;
      color: rgba(255,255,255,0.7);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.5; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(8px); }
      100% { opacity: 0.5; transform: translateX(-50%) translateY(0); }
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 32px;
      }
      .hero p {
        font-size: 16px;
      }
    }
    
    /* 信任标识条 */
    .trust-bar {
      background: white;
      padding: 32px 0;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 48px;
    }
    .trust-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 500;
      color: var(--text-muted);
    }
    .trust-item i {
      font-size: 24px;
      color: var(--accent1);
    }
    
    /* 卡片通用 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      overflow: hidden;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .card-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
    }
    .card-body {
      padding: 28px;
    }
    
    /* 三列网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }
    
    /* 解决方案交错 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
    }
    .solution-text {
      flex: 1;
    }
    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
        gap: 32px;
      }
    }
    
    /* 步骤条 */
    .steps {
      display: flex;
      justify-content: space-between;
      gap: 16px;
    }
    .step-item {
      flex: 1;
      text-align: center;
      padding: 24px;
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent1);
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
      }
    }
    
    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
      cursor: pointer;
      border: 1px solid var(--border-light);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      color: white;
      text-align: center;
      border-radius: 24px;
      padding: 64px 24px;
      margin: 0 24px;
    }
    
    /* 页脚 */
    .site-footer {
      background: var(--primary);
      color: rgba(255,255,255,0.85);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }