/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-hover: #14312A;
      --accent: #E8B86D;
      --accent-hover: #D4A24E;
      --bg-warm: #F7F4EF;
      --dark-bg: #2B2B2B;
      --text-dark: #1E1E1E;
      --text-mid: #5C5C5C;
      --text-light: #8A8A8A;
      --success-green: #2D6A4F;
      --white: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 24px rgba(0,0,0,0.08);
      --border-radius-lg: 12px;
      --border-radius-md: 8px;
      --border-radius-pill: 20px;
      --transition: 0.25s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Text", system-ui, sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      margin-bottom: 0.75rem;
    }
    h1 {
      font-size: 36px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      font-weight: 700;
    }
    h2 {
      font-size: 28px;
      line-height: 1.3;
      letter-spacing: 0;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 500;
    }
    p {
      color: var(--text-mid);
      margin-bottom: 1.25rem;
    }
    .text-small {
      font-size: 14px;
      line-height: 1.6;
    }
    .text-muted {
      color: var(--text-light);
      font-size: 14px;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover {
      color: var(--primary-hover);
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    .section-spacing {
      padding: 100px 0;
    }
    @media (max-width: 1024px) {
      .section-spacing {
        padding: 80px 0;
      }
    }
    @media (max-width: 640px) {
      .section-spacing {
        padding: 60px 0;
      }
      h1 {
        font-size: 28px;
        line-height: 1.3;
      }
      h2 {
        font-size: 22px;
        line-height: 1.4;
      }
      h3 {
        font-size: 18px;
      }
    }

    /* 卡片化导航 */
    .nav-card {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 0 0 16px 16px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      padding: 0.75rem 1.5rem;
      margin: 0 1rem;
      position: fixed;
      top: 16px;
      left: 0;
      right: 0;
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all var(--transition);
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.3px;
    }
    .nav-brand i {
      font-size: 1.8rem;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.5rem 0.9rem;
      border-radius: var(--border-radius-md);
      color: var(--text-dark);
      font-weight: 500;
      font-size: 0.95rem;
      transition: background var(--transition), color var(--transition);
      background: transparent;
    }
    .nav-item i {
      font-size: 1.1rem;
      color: var(--primary);
    }
    .nav-item:hover {
      background: rgba(26,60,52,0.08);
      color: var(--primary);
    }
    .nav-cta {
      background: var(--accent);
      color: var(--primary);
      padding: 0.6rem 1.4rem;
      border-radius: var(--border-radius-md);
      font-weight: 600;
      font-size: 0.95rem;
      transition: background var(--transition), transform var(--transition);
      white-space: nowrap;
      margin-left: 0.5rem;
    }
    .nav-cta:hover {
      background: var(--accent-hover);
      color: var(--primary);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--primary);
      cursor: pointer;
      background: none;
      border: none;
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 0.2rem;
      }
      .nav-item span {
        display: none;
      }
      .nav-item i {
        font-size: 1.3rem;
      }
      .nav-item {
        padding: 0.5rem 0.7rem;
      }
    }
    @media (max-width: 640px) {
      .nav-card {
        padding: 0.7rem 1rem;
        margin: 0 0.5rem;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.96);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 1rem;
        border-radius: 16px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        gap: 0.5rem;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-item {
        justify-content: flex-start;
        padding: 0.8rem 1rem;
        width: 100%;
      }
      .nav-item span {
        display: inline;
        margin-left: 0.5rem;
      }
      .hamburger {
        display: block;
      }
      .nav-cta {
        margin-left: 0;
        width: 100%;
        text-align: center;
        margin-top: 0.5rem;
      }
    }

    /* 卡片组件 */
    .card {
      background: var(--white);
      border-radius: var(--border-radius-lg);
      box-shadow: var(--card-shadow);
      padding: 2rem;
      transition: box-shadow var(--transition), transform var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-3px);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(26,60,52,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.5rem;
      margin-bottom: 1.2rem;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.875rem 2rem;
      border-radius: var(--border-radius-md);
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.5px;
      display: inline-block;
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
      border: none;
      cursor: pointer;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(26,60,52,0.2);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 0.75rem 2rem;
      border-radius: var(--border-radius-md);
      font-weight: 600;
      display: inline-block;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: rgba(26,60,52,0.05);
      color: var(--primary);
    }
    .btn-accent {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 1rem 2.5rem;
      border-radius: 10px;
      font-size: 1.1rem;
      border: none;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      color: var(--primary);
    }
    .tag {
      background: rgba(26,60,52,0.1);
      color: var(--primary);
      padding: 0.25rem 0.9rem;
      border-radius: var(--border-radius-pill);
      font-size: 0.75rem;
      font-weight: 500;
      display: inline-block;
    }
    .dark-block {
      background-color: var(--dark-bg);
      color: white;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .faq-item {
      background: var(--white);
      border-radius: var(--border-radius-md);
      margin-bottom: 0.8rem;
      box-shadow: 0 1px 6px rgba(0,0,0,0.03);
      overflow: hidden;
    }
    .faq-question {
      padding: 1rem 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
      color: var(--text-dark);
      transition: background var(--transition);
      background: white;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1rem;
    }
    .faq-question:hover {
      background: rgba(26,60,52,0.03);
    }
    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-mid);
      display: none;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    footer {
      background: #1E1E1E;
      color: #B0B0B0;
      font-size: 0.9rem;
    }
    footer a {
      color: #B0B0B0;
    }
    footer a:hover {
      color: var(--accent);
    }