/* roulang page: index */
/* 全局设计变量与基础重置 */
    :root {
      --primary-deep: #1A2B3F;
      --accent-gold: #C9A96E;
      --accent-gold-hover: #B8914D;
      --bg-light: #F7F8FA;
      --white: #FFFFFF;
      --text-heading: #2C3E50;
      --text-body: #5D6D7E;
      --text-light: #FFFFFF;
      --border-soft: rgba(0,0,0,0.06);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.10);
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Inter', 'PingFang SC', sans-serif;
      --transition: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      color: var(--text-heading);
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    
    h1 {
      font-size: 3rem;
      line-height: 1.2;
      color: var(--primary-deep);
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 3px;
      background: var(--accent-gold);
    }
    .text-center h2::after {
      left: 50%;
      transform: translateX(-50%);
    }
    h3 {
      font-size: 1.375rem;
      font-weight: 600;
      color: var(--primary-deep);
    }
    
    a {
      color: var(--accent-gold);
      transition: var(--transition);
      text-decoration: none;
    }
    a:hover {
      color: var(--accent-gold-hover);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    
    .section {
      padding: 5rem 0;
    }
    .section-sm {
      padding: 4rem 0;
    }
    
    .bg-deep {
      background-color: var(--primary-deep);
      color: var(--text-light);
    }
    .bg-deep h2, .bg-deep h3, .bg-deep p {
      color: var(--text-light);
    }
    .bg-deep h2::after {
      background: var(--accent-gold);
    }
    
    .btn {
      display: inline-block;
      font-weight: 600;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      font-size: 1rem;
      cursor: pointer;
      text-align: center;
      border: 2px solid transparent;
      font-family: var(--font-sans);
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--white);
      border-color: var(--accent-gold);
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      border-color: var(--accent-gold-hover);
      color: var(--white);
    }
    .btn-outline {
      background: transparent;
      color: var(--accent-gold);
      border-color: var(--accent-gold);
    }
    .btn-outline:hover {
      background: rgba(201, 169, 110, 0.1);
      color: var(--accent-gold);
    }
    .btn-light {
      background: var(--white);
      color: var(--primary-deep);
      border-color: var(--white);
    }
    .btn-light:hover {
      background: #f0f0f0;
      border-color: #f0f0f0;
    }
    
    .card {
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      padding: 2rem;
      transition: var(--transition);
      height: 100%;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border: 1px solid var(--accent-gold);
      border-color: var(--accent-gold);
    }
    
    /* 导航 */
    .site-header {
      background: var(--white);
      padding: 0.8rem 0;
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
      transition: box-shadow 0.3s;
    }
    .header-shadow {
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--accent-gold);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-heading);
      padding: 0.4rem 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }
    .nav-cta {
      background: var(--accent-gold);
      color: var(--white) !important;
      padding: 0.5rem 1.5rem !important;
      border-radius: var(--radius-sm);
      border-bottom: none !important;
    }
    .nav-cta:hover {
      background: var(--accent-gold-hover);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
    }
    
    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-text h1 {
      margin-bottom: 1.2rem;
    }
    .hero-text p {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      color: var(--text-body);
    }
    .hero-image img {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-hover);
    }
    
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      align-items: center;
    }
    .pain-text h3 {
      margin-bottom: 1rem;
    }
    .pain-image img {
      border-radius: var(--radius-md);
    }
    
    /* 方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .solution-card i {
      font-size: 2.2rem;
      color: var(--accent-gold);
      margin-bottom: 1.2rem;
    }
    
    /* 流程 */
    .steps-row {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-number {
      width: 56px;
      height: 56px;
      background: var(--accent-gold);
      color: var(--white);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      font-weight: 700;
      margin: 0 auto 1.2rem;
      position: relative;
      z-index: 2;
    }
    .step-line {
      position: absolute;
      top: 28px;
      left: 50%;
      width: 100%;
      height: 2px;
      border-top: 2px dashed #ccc;
      z-index: 1;
    }
    .step-item:last-child .step-line {
      display: none;
    }
    
    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--accent-gold);
      font-family: var(--font-serif);
    }
    
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .testimonial-card {
      display: flex;
      gap: 1.5rem;
      align-items: flex-start;
    }
    .testimonial-avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      object-fit: cover;
    }
    blockquote {
      font-style: italic;
      color: var(--text-heading);
      margin: 0 0 0.5rem;
    }
    
    /* FAQ */
    .accordion-title {
      font-weight: 600;
      color: var(--text-heading);
      font-size: 1.1rem;
      border: none;
      background: var(--white);
      padding: 1.2rem 1.5rem;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }
    .accordion-title:hover {
      background: #fafafa;
    }
    .accordion-content {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-body);
    }
    
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-deep);
      border-radius: var(--radius-md);
    }
    
    /* 页脚 */
    .site-footer {
      background: #1e2b3a;
      color: #b0bec5;
      padding: 3rem 0 1.5rem;
      font-size: 0.95rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 3rem;
      margin-bottom: 2rem;
    }
    .footer-brand h3 {
      color: var(--white);
      font-family: var(--font-serif);
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 2.4rem; }
      h2 { font-size: 1.9rem; }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 1.5rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        gap: 1rem;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .hero-grid,
      .pain-grid,
      .testimonial-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
      }
      .solution-grid {
        grid-template-columns: 1fr;
      }
      .steps-row {
        flex-direction: column;
        gap: 2rem;
      }
      .step-line {
        display: none;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 520px) {
      .container { padding: 0 1rem; }
      h1 { font-size: 2rem; }
      .btn { padding: 0.7rem 1.8rem; }
    }