/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
      --primary: #3E2723;
      --accent: #C9A84C;
      --accent-hover: #B8943A;
      --bg-warm: #FAF8F5;
      --bg-dark: #2C1E16;
      --bg-footer: #F0EBE5;
      --card-bg: #FFFFFF;
      --text-primary: #3E2723;
      --text-body: #5D4E47;
      --text-muted: #8D7B72;
      --border-light: #E8E0D9;
      --shadow-card: 0 4px 24px rgba(62, 39, 35, 0.06);
      --shadow-card-hover: 0 12px 32px rgba(62, 39, 35, 0.12);
      --shadow-gold: 0 8px 20px rgba(201, 168, 76, 0.4);
      --radius-card: 16px;
      --radius-btn: 40px;
      --max-width: 1280px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s, background 0.3s;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 排版 */
    h1, h2, h3, .h1, .h2, .h3 {
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .block-title {
      display: flex;
      align-items: center;
      gap: 16px;
      font-size: 36px;
      font-weight: 600;
      letter-spacing: -0.3px;
      margin-bottom: 48px;
    }
    .block-title::before {
      content: '';
      display: inline-block;
      width: 32px;
      height: 2px;
      background-color: var(--accent);
      flex-shrink: 0;
    }
    @media (max-width: 767px) {
      .block-title {
        font-size: 26px;
        margin-bottom: 32px;
      }
    }
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 16px;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      transition: all 0.3s cubic-bezier(0.25,0.8,0.25,1.2);
      cursor: pointer;
      border: none;
      font-family: inherit;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      box-shadow: 0 4px 12px rgba(201,168,76,0.3);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: var(--shadow-gold);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
    }
    .btn-outline:hover {
      background: rgba(201,168,76,0.1);
    }
    .btn-sm {
      padding: 10px 24px;
      font-size: 14px;
    }
    .text-link {
      color: var(--accent);
      font-weight: 500;
      position: relative;
      display: inline-block;
    }
    .text-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 1.5px;
      background: var(--accent);
      transition: width 0.25s ease, left 0.25s ease;
    }
    .text-link:hover::after {
      width: 100%;
      left: 0;
    }
    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: all 0.3s cubic-bezier(0.25,0.8,0.25,1.2);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    /* 导航 */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height);
      transition: background 0.25s, box-shadow 0.25s;
      background: rgba(250,248,245,0.92);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 24px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
    }
    .nav-menu a:hover {
      color: var(--accent);
    }
    .nav-separator {
      color: #d9c9b8;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--primary);
      display: block;
      transition: 0.2s;
    }
    @media (max-width: 767px) {
      .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(44,30,22,0.97);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        z-index: 999;
      }
      .nav-menu.active {
        transform: translateX(0);
      }
      .nav-menu a {
        color: white;
        font-size: 20px;
      }
      .nav-separator {
        display: none;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .nav-cta {
        display: none;
      }
    }
    .desktop-cta {
      display: inline-flex;
    }
    @media (max-width: 767px) {
      .desktop-cta {
        display: none;
      }
    }
    /* Hero 数据看板 */
    #hero {
      padding: 140px 0 100px;
      background: var(--bg-warm);
      position: relative;
      overflow: hidden;
    }
    #hero::before {
      content: '';
      position: absolute;
      right: 0;
      top: 0;
      width: 45%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.04;
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 40%;
      display: flex;
      flex-direction: column;
      gap: 48px;
    }
    .hero-left h1 {
      font-size: 56px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: -0.5px;
      line-height: 1.15;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-metrics {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .metric-item {
      text-align: center;
      background: rgba(255,255,255,0.2);
      backdrop-filter: blur(2px);
      padding: 16px 20px;
      border-radius: 12px;
      min-width: 140px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }
    .metric-value {
      font-family: 'Inter', sans-serif;
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
      letter-spacing: -1px;
      display: block;
      line-height: 1.1;
    }
    .metric-label {
      font-size: 13px;
      color: #8D7B72;
      font-weight: 500;
      margin-top: 4px;
    }
    @media (max-width: 1023px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: unset;
        width: 100%;
      }
      .hero-metrics {
        flex-direction: row;
        justify-content: center;
      }
      #hero::before {
        width: 100%;
        opacity: 0.02;
      }
      .hero-left h1 {
        font-size: 42px;
      }
    }
    @media (max-width: 767px) {
      .metric-value {
        font-size: 36px;
      }
    }
    /* 服务矩阵 */
    #services {
      padding: 120px 0;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 32px;
    }
    .service-card {
      text-align: left;
    }
    .service-icon {
      font-size: 42px;
      color: var(--accent);
      margin-bottom: 20px;
      transition: transform 0.3s;
    }
    .card:hover .service-icon {
      transform: rotate(5deg) scale(1.05);
    }
    .service-divider {
      height: 1px;
      background: var(--border-light);
      margin: 20px 0;
    }
    .service-card h3 {
      font-size: 22px;
    }
    /* 对比区块 */
    #compare {
      background: var(--bg-dark);
      padding: 120px 0;
      color: #F0EBE5;
    }
    #compare .block-title {
      color: var(--accent);
    }
    .compare-grid {
      display: flex;
      gap: 48px;
      margin: 48px 0 24px;
    }
    .compare-col {
      flex: 1;
    }
    .badge {
      display: inline-block;
      font-weight: 700;
      padding: 8px 24px;
      border-radius: 30px;
      font-size: 15px;
      margin-bottom: 32px;
    }
    .badge-bad {
      background: #8B3A3A;
      color: #fbeaea;
    }
    .badge-good {
      background: var(--accent);
      color: var(--primary);
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 17px;
      margin-bottom: 18px;
      background: rgba(255,255,255,0.04);
      padding: 8px 12px;
      border-radius: 8px;
    }
    .compare-note {
      color: #b3a393;
      font-size: 13px;
      margin-top: 32px;
    }
    @media (max-width: 767px) {
      .compare-grid {
        flex-direction: column;
      }
    }
    /* FAQ */
    #faq {
      padding: 120px 0;
    }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 24px 0;
      cursor: pointer;
      transition: all 0.25s;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
      color: var(--primary);
    }
    .faq-icon {
      transition: transform 0.25s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      font-size: 16px;
      color: #4e433c;
      padding-left: 16px;
      border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
      border-left-color: var(--accent);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* CTA */
    #cta {
      background: var(--bg-dark);
      padding: 100px 0;
      text-align: center;
    }
    .cta-title {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .cta-sub {
      color: #ddceb5;
      margin-bottom: 32px;
    }
    .cta-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 16px;
    }
    .cta-note {
      color: #a39484;
      font-size: 13px;
    }
    /* 页脚 */
    footer {
      background: var(--bg-footer);
      padding: 64px 0 32px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-col p {
      margin: 12px 0;
    }
    .footer-col h4 {
      font-weight: 700;
      font-size: 14px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .footer-col a {
      display: block;
      color: var(--text-body);
      font-size: 14px;
      margin-bottom: 12px;
    }
    .footer-col a:hover {
      color: var(--accent);
    }
    .copyright {
      text-align: center;
      margin-top: 48px;
      font-size: 12px;
      color: var(--text-muted);
    }
    @media (max-width: 767px) {
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .cta-title {
        font-size: 28px;
      }
    }
    .social-icons i {
      font-size: 18px;
      margin-right: 16px;
      color: #5D4E47;
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--accent);
    }
    /* 整体间距调整 */
    section {
      scroll-margin-top: 80px;
    }
    hr {
      border: 0.5px solid var(--border-light);
    }
    button {
      cursor: pointer;
    }
    @media (max-width:767px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }