/* roulang page: index */
:root {
      --暮光赭: #A0522D;
      --余晖金: #D4A574;
      --夜幕棕: #3E2723;
      --晨雾米: #FDF5EC;
      --炉火橙: #E67E22;
      --暖灰底: #F5EDE3;
      --浅卡边框: #EDE0D4;
      --正文棕: #4E3B31;
      --弱文棕: #8B7355;
      --白底: #FFFFFF;
      --阴影浅: 0 4px 12px rgba(62,39,35,0.08);
      --阴影深: 0 8px 24px rgba(62,39,35,0.15);
      --圆角卡片: 12px;
      --圆角按钮: 30px;
      --侧栏宽: 240px;
      --过渡: all 0.25s ease;
    }

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

    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      background-color: var(--晨雾米);
      color: var(--正文棕);
      line-height: 1.8;
      font-size: 16px;
      display: flex;
      min-height: 100vh;
      flex-direction: column;
    }

    /* 桌面端侧边栏布局 */
    .app-shell {
      display: flex;
      flex: 1;
    }

    /* 左侧固定导航 */
    .side-nav {
      width: var(--侧栏宽);
      background-color: var(--夜幕棕);
      color: var(--晨雾米);
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      display: flex;
      flex-direction: column;
      padding: 2rem 1.2rem;
      box-shadow: 2px 0 12px rgba(0,0,0,0.1);
      z-index: 40;
      transition: transform 0.3s ease;
    }

    .logo-area {
      margin-bottom: 2.5rem;
      text-align: center;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--余晖金);
      display: block;
      line-height: 1.3;
    }
    .logo-sub {
      font-size: 0.75rem;
      color: #bcaaa4;
      letter-spacing: 1px;
      display: block;
      margin-top: 4px;
    }

    .nav-links {
      list-style: none;
      flex: 1;
      margin-top: 1rem;
    }
    .nav-links li {
      margin-bottom: 0.5rem;
    }
    .nav-links a {
      display: block;
      padding: 0.75rem 1rem;
      color: #d7ccc8;
      text-decoration: none;
      border-radius: 8px;
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--过渡);
      position: relative;
      border-left: 3px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--余晖金);
      background-color: rgba(255,255,255,0.05);
      border-left-color: var(--炉火橙);
      padding-left: 1.2rem;
    }
    .nav-links a i {
      margin-right: 8px;
      width: 18px;
      text-align: center;
      color: var(--炉火橙);
    }

    /* 主内容区域 */
    .main-content {
      margin-left: var(--侧栏宽);
      flex: 1;
      width: calc(100% - var(--侧栏宽));
      background-color: var(--晨雾米);
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      background: var(--夜幕棕);
      color: white;
      padding: 0.8rem 1.2rem;
      align-items: center;
      justify-content: space-between;
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 45;
      box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    }
    .mobile-logo {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--余晖金);
    }
    .hamburger {
      font-size: 1.8rem;
      color: var(--晨雾米);
      cursor: pointer;
      background: none;
      border: none;
    }

    /* 抽屉菜单 */
    .drawer {
      position: fixed;
      top: 0;
      left: 0;
      width: 260px;
      height: 100%;
      background: var(--夜幕棕);
      z-index: 50;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      padding: 2rem 1.2rem;
      display: flex;
      flex-direction: column;
    }
    .drawer.open {
      transform: translateX(0);
    }
    .drawer .nav-links a {
      color: #d7ccc8;
    }
    .close-drawer {
      align-self: flex-end;
      background: none;
      border: none;
      color: var(--晨雾米);
      font-size: 1.6rem;
      margin-bottom: 1rem;
      cursor: pointer;
    }

    /* 通用板块 */
    .section {
      padding: 5rem 2.5rem;
      max-width: 1100px;
      margin: 0 auto;
    }
    .section-alt {
      background-color: var(--暖灰底);
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      color: var(--夜幕棕);
      margin-bottom: 2rem;
      position: relative;
      display: inline-block;
    }
    h2:after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 3px;
      background: var(--炉火橙);
      border-radius: 2px;
    }
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--圆角按钮);
      padding: 0.8rem 2.2rem;
      text-decoration: none;
      transition: var(--过渡);
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }
    .btn-primary {
      background: var(--炉火橙);
      color: white;
      box-shadow: 0 4px 10px rgba(230,126,34,0.3);
    }
    .btn-primary:hover {
      background: #D35400;
      box-shadow: 0 6px 14px rgba(211,84,0,0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 2px solid var(--暮光赭);
      color: var(--暮光赭);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--暮光赭);
      color: white;
    }

    .card {
      background: var(--白底);
      border-radius: var(--圆角卡片);
      border: 1px solid var(--浅卡边框);
      box-shadow: var(--阴影浅);
      padding: 1.8rem;
      transition: var(--过渡);
    }
    .card:hover {
      box-shadow: var(--阴影深);
      transform: translateY(-3px);
    }

    /* Hero区 */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero-text h1 {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--夜幕棕);
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }
    .hero-image {
      flex: 1 1 400px;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 30px rgba(62,39,35,0.2);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
    }
    .overlay-warm {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(135deg, rgba(160,82,45,0.2) 0%, rgba(62,39,35,0.4) 100%);
    }

    /* 痛点交错 */
    .pain-row {
      display: flex;
      align-items: center;
      gap: 2rem;
      margin-bottom: 2.5rem;
      flex-wrap: wrap;
    }
    .pain-row.reverse {
      flex-direction: row-reverse;
    }
    .pain-text, .pain-img {
      flex: 1 1 300px;
    }

    /* 解决方案路径 */
    .solution-steps {
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }
    .step-item {
      display: flex;
      gap: 1.8rem;
      align-items: flex-start;
    }
    .step-icon {
      background: var(--暮光赭);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    /* 成果数字 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--炉火橙);
    }

    /* FAQ */
    .accordion-title {
      background: var(--晨雾米);
      padding: 1rem 1.5rem;
      border: 1px solid var(--浅卡边框);
      border-radius: 8px;
      cursor: pointer;
      font-weight: 500;
      color: var(--夜幕棕);
    }

    /* CTA满版 */
    .cta-full {
      background: linear-gradient(135deg, var(--暮光赭) 0%, var(--夜幕棕) 100%);
      color: white;
      text-align: center;
      padding: 4rem 1.5rem;
    }

    footer {
      background: var(--夜幕棕);
      color: #bcaaa4;
      padding: 2rem;
      text-align: center;
    }

    @media screen and (max-width: 1024px) {
      .side-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: 70px;
      }
      .section {
        padding: 3rem 1.5rem;
      }
    }
    @media screen and (max-width: 640px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.8rem; }
    }