/* roulang page: index */
:root {
      --deep-green: #0B2B26;
      --gold: #D4A017;
      --warm-cream: #F2F0E6;
      --terracotta: #C94C2C;
      --text-dark: #1E1E1E;
      --text-muted: #4A4A4A;
      --white: #FFFFFF;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 8px 30px rgba(0,0,0,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --transition-base: 0.3s ease;
      --transition-btn: 0.25s ease;
      --font-title: 'Alibaba PuHuiTi', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-data: 'DIN Alternate', 'Alibaba PuHuiTi', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--warm-cream);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      margin-top: 0;
    }

    h1 {
      font-size: clamp(2.2rem, 6vw, 3.5rem);
      font-weight: 700;
      color: var(--deep-green);
      line-height: 1.2;
    }

    h2 {
      font-size: clamp(1.8rem, 4vw, 2.4rem);
      font-weight: 600;
      color: var(--deep-green);
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--deep-green);
      margin-bottom: 0.5rem;
    }

    .section {
      padding-top: 6rem;
      padding-bottom: 6rem;
    }

    @media (max-width: 768px) {
      .section {
        padding-top: 4rem;
        padding-bottom: 4rem;
      }
    }

    /* 按钮系统 */
    .btn-primary {
      background-color: var(--gold);
      color: var(--deep-green);
      font-weight: 700;
      border-radius: var(--radius-md);
      padding: 0.875rem 2.25rem;
      display: inline-block;
      text-decoration: none;
      transition: var(--transition-btn);
      border: none;
      cursor: pointer;
      font-family: var(--font-title);
      letter-spacing: 0.5px;
    }

    .btn-primary:hover {
      background-color: #B8890F;
      transform: scale(1.03);
      box-shadow: 0 6px 18px rgba(212, 160, 23, 0.4);
    }

    .btn-outline {
      background: transparent;
      color: var(--deep-green);
      font-weight: 600;
      border: 2px solid var(--deep-green);
      border-radius: var(--radius-md);
      padding: 0.75rem 2rem;
      display: inline-block;
      text-decoration: none;
      transition: var(--transition-btn);
      cursor: pointer;
    }

    .btn-outline:hover {
      background-color: var(--deep-green);
      color: var(--white);
      border-color: var(--deep-green);
    }

    .btn-light {
      background-color: var(--deep-green);
      color: var(--white);
      font-weight: 700;
      border-radius: var(--radius-md);
      padding: 0.875rem 2.5rem;
      display: inline-block;
      text-decoration: none;
      transition: var(--transition-btn);
      border: none;
      cursor: pointer;
      font-family: var(--font-title);
    }

    .btn-light:hover {
      background-color: #000000;
      transform: scale(1.02);
    }

    /* 卡片系统 */
    .card {
      background: var(--white);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      border: 1px solid rgba(0,0,0,0.04);
      transition: var(--transition-base);
      padding: 2rem;
      height: 100%;
    }

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

    .pain-card {
      border-left: 4px solid var(--gold);
      background: var(--white);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      padding: 1.8rem;
      transition: var(--transition-base);
    }

    .pain-card:hover {
      box-shadow: var(--card-hover-shadow);
    }

    /* 导航杂志频道样式 */
    .nav-channel a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      padding-bottom: 0.25rem;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

    .nav-channel a:hover,
    .nav-channel a.active {
      color: var(--deep-green);
      border-bottom-color: var(--gold);
      font-weight: 600;
    }

    /* 移动端汉堡菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: var(--white);
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      padding: 1.5rem;
      z-index: 50;
    }

    .mobile-menu a {
      display: block;
      padding: 0.75rem 0;
      border-bottom: 1px solid #eee;
      color: var(--text-dark);
      font-weight: 500;
    }

    #menu-toggle:checked ~ .mobile-menu {
      display: flex;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.08);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 0;
      font-weight: 600;
      color: var(--deep-green);
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--gold);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
      padding-left: 1rem;
      border-left: 3px solid var(--gold);
      margin-bottom: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 0.5rem;
      padding-bottom: 1rem;
    }
    .faq-item.active .faq-question i {
      transform: rotate(180deg);
      color: var(--gold);
    }

    /* 装饰性体育线条 */
    .bg-pattern {
      background-image: radial-gradient(circle at 10px 10px, rgba(255,255,255,0.05) 2px, transparent 2px);
      background-size: 40px 40px;
    }

    /* 数据数字动画预留 */
    .data-number {
      font-family: var(--font-data);
      font-weight: 700;
      color: var(--gold);
    }