/* roulang page: index */
:root {
      --primary: #3A2A40;
      --primary-dark: #2E1F33;
      --accent: #C8A96E;
      --bg-warm: #F7F5F2;
      --bg-dark: #1E1C1A;
      --text-primary: #1A1817;
      --text-secondary: #6B6560;
      --text-muted: #9C948A;
      --success: #2E5C4A;
      --border-light: #E5E0D9;
      --white: #FFFFFF;
      --card-bg: #FAF9F7;
      --shadow-sm: 0 4px 20px rgba(58,42,64,0.06);
      --shadow-hover: 0 12px 32px rgba(58,42,64,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --font-serif: 'Noto Serif SC', Georgia, serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.3s ease;
      --nav-width: 240px;
      --section-gap: 120px;
      --section-gap-mobile: 80px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input, textarea {
      font-family: inherit;
      border: none;
      outline: none;
      background: none;
    }

    ul, ol {
      list-style: none;
    }

    /* 主布局：桌面端左侧固定导航 + 右侧内容 */
    .app-layout {
      display: flex;
      min-height: 100vh;
    }

    /* 左侧导航 */
    .side-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background: var(--bg-dark);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 40px 0 30px;
      z-index: 1000;
      box-shadow: 2px 0 24px rgba(0,0,0,0.2);
    }

    .nav-logo {
      text-align: center;
      padding: 0 20px 24px;
      border-bottom: 1px solid rgba(200,169,110,0.2);
      margin-bottom: 40px;
    }

    .nav-logo a {
      font-family: var(--font-serif);
      font-size: 22px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 1px;
      display: block;
    }

    .nav-list {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 8px;
      padding: 0 16px;
    }

    .nav-list a {
      display: block;
      color: var(--text-muted);
      padding: 12px 20px;
      border-radius: var(--radius-md);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      transition: all var(--transition);
      letter-spacing: 0.3px;
    }

    .nav-list a:hover {
      color: var(--accent);
      transform: translateX(4px);
      background: rgba(200,169,110,0.05);
    }

    .nav-list a.active {
      color: var(--accent);
      background: rgba(200,169,110,0.08);
      border-left: 3px solid var(--accent);
    }

    .nav-cta-mini {
      padding: 0 20px;
      margin-top: 20px;
    }

    .btn-nav-cta {
      display: block;
      width: 100%;
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 10px 16px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 14px;
      text-align: center;
      transition: all var(--transition);
      cursor: pointer;
    }

    .btn-nav-cta:hover {
      background: var(--accent);
      color: var(--primary);
    }

    .main-content {
      margin-left: var(--nav-width);
      flex: 1;
      background: var(--bg-warm);
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: var(--bg-dark);
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      z-index: 999;
      box-shadow: 0 2px 12px rgba(0,0,0,0.3);
    }

    .mobile-logo {
      font-family: var(--font-serif);
      font-size: 20px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 0.5px;
    }

    .burger-btn {
      width: 32px;
      height: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .burger-btn span {
      display: block;
      height: 3px;
      width: 100%;
      background: var(--accent);
      border-radius: 2px;
      transition: all var(--transition);
    }

    .mobile-drawer {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--bg-dark);
      z-index: 1001;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      transform: translateX(-100%);
      transition: transform 0.35s ease;
    }

    .mobile-drawer.open {
      transform: translateX(0);
    }

    .drawer-close {
      position: absolute;
      top: 20px;
      right: 24px;
      font-size: 32px;
      color: var(--accent);
      cursor: pointer;
      background: none;
      border: none;
    }

    .drawer-nav a {
      display: block;
      color: var(--text-muted);
      font-size: 20px;
      padding: 16px 0;
      text-align: center;
      font-weight: 500;
      transition: color var(--transition);
    }

    .drawer-nav a:hover {
      color: var(--accent);
    }

    /* 通用容器 */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-family: var(--font-serif);
      font-size: 32px;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 17px;
      max-width: 680px;
      margin-bottom: 48px;
    }

    /* 按钮系统 */
    .btn-primary {
      display: inline-block;
      background: var(--primary);
      color: var(--white);
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
      border: 1px solid transparent;
      cursor: pointer;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--accent);
      box-shadow: 0 8px 20px rgba(58,42,64,0.3);
    }

    .btn-outline {
      display: inline-block;
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
      cursor: pointer;
    }

    .btn-outline:hover {
      background: var(--accent);
      color: var(--primary);
    }

    .btn-lg {
      padding: 18px 40px;
      font-size: 18px;
    }

    /* 卡片 */
    .card {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      padding: 32px;
      transition: all var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent);
    }

    /* Hero */
    .hero {
      background: var(--bg-dark);
      color: var(--white);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: repeating-linear-gradient(45deg, rgba(200,169,110,0.03) 0px, rgba(200,169,110,0.03) 2px, transparent 2px, transparent 8px);
      pointer-events: none;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 1;
    }

    .hero h1 {
      font-family: var(--font-serif);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero p {
      font-size: 18px;
      font-weight: 300;
      color: rgba(255,255,255,0.8);
      max-width: 500px;
      margin-bottom: 36px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-image {
      flex: 0.9;
    }

    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--accent);
      font-size: 28px;
      animation: pulse 2s infinite;
      opacity: 0.8;
    }

    @keyframes pulse {
      0% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
      50% { transform: translateX(-50%) translateY(6px); opacity: 1; }
      100% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .pain-card {
      background: var(--white);
      border-left: 4px solid var(--accent);
      padding: 28px 24px;
      border-radius: 0 var(--radius-md) var(--radius-md) 0;
      box-shadow: var(--shadow-sm);
      font-size: 15px;
      color: var(--text-secondary);
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .solution-card {
      background: var(--card-bg);
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      transition: all var(--transition);
    }

    .solution-card:hover {
      border-color: var(--accent);
    }

    .icon-placeholder {
      width: 48px;
      height: 48px;
      background: rgba(200,169,110,0.15);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 24px;
      margin-bottom: 20px;
    }

    /* 优势 Features */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feature-card {
      text-align: center;
      padding: 36px 24px;
    }

    .feature-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 20px;
    }

    /* 流程 */
    .process-section {
      background: var(--bg-dark);
      color: var(--white);
    }

    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 20px;
      position: relative;
    }

    .step-item {
      flex: 1;
      text-align: center;
      position: relative;
    }

    .step-circle {
      width: 56px;
      height: 56px;
      border: 2px solid var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 700;
      color: var(--white);
      margin: 0 auto 20px;
      background: rgba(200,169,110,0.1);
    }

    .step-line {
      position: absolute;
      top: 28px;
      left: 60%;
      width: 80%;
      height: 2px;
      border-top: 2px dashed var(--accent);
      opacity: 0.5;
    }

    .step-item:last-child .step-line {
      display: none;
    }

    /* 数据 Results */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-serif);
      line-height: 1.1;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .testimonial-card {
      background: var(--white);
      border-left: 4px solid var(--accent);
      padding: 32px;
      border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    }

    .quote-icon {
      color: var(--accent);
      font-size: 32px;
      margin-bottom: 16px;
    }

    blockquote {
      font-style: italic;
      color: var(--text-secondary);
      margin-bottom: 20px;
    }

    .testimonial-author {
      font-weight: 600;
      color: var(--primary);
    }

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

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

    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 24px 0;
      font-weight: 600;
      font-size: 18px;
      color: var(--text-primary);
      cursor: pointer;
      background: transparent;
      transition: color var(--transition);
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 24px;
      color: var(--accent);
      transition: transform 0.2s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      text-align: center;
    }

    .cta-section .section-title {
      color: var(--accent);
    }

    .cta-section .btn-primary {
      background: var(--accent);
      color: var(--primary);
    }

    .footer {
      background: var(--bg-dark);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
      gap: 40px;
    }

    .footer-logo {
      font-family: var(--font-serif);
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 12px;
    }

    .footer a:hover {
      color: var(--accent);
    }

    .copyright {
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,0.1);
      text-align: center;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      :root {
        --nav-width: 0;
      }
      .side-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        padding-top: 60px;
      }
      .container {
        padding: 0 24px;
      }
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero p {
        max-width: 100%;
      }
      .pain-grid, .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 26px;
      }
      .hero h1 {
        font-size: 32px;
      }
      .pain-grid, .solution-grid, .features-grid, .testimonials-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
      .process-steps {
        flex-direction: column;
        align-items: center;
      }
      .step-line {
        display: none;
      }
      .btn-primary, .btn-outline {
        width: 100%;
        text-align: center;
      }
      .hero-buttons {
        flex-direction: column;
      }
    }