/* roulang page: index */
@layer base {
      :root {
        --color-primary: #C8102E;
        --color-primary-dark: #A00D24;
        --color-dark: #1E1E1E;
        --color-gold: #D4AF37;
        --color-bg-light: #F5F5F5;
        --color-white: #FFFFFF;
        --color-border: #E5E5E5;
        --color-text: #333333;
        --color-text-light: #666666;
        --color-text-muted: #AAAAAA;
        --radius-sm: 6px;
        --radius-md: 8px;
        --shadow-card: 0 8px 24px rgba(200,16,46,0.08);
        --transition-base: 0.25s ease;
        --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      }
      * {
        box-sizing: border-box;
      }
      body {
        font-family: var(--font-sans);
        color: var(--color-text);
        background-color: var(--color-white);
        line-height: 1.7;
        margin: 0;
        -webkit-font-smoothing: antialiased;
      }
      a {
        color: inherit;
        text-decoration: none;
        transition: color var(--transition-base);
      }
      img {
        max-width: 100%;
        height: auto;
        display: block;
      }
      button, .btn {
        cursor: pointer;
        font-family: inherit;
        transition: all 0.2s ease;
      }
      .container-main {
        max-width: 1280px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 40px;
        padding-right: 40px;
      }
      @media (max-width: 1023px) {
        .container-main {
          padding-left: 24px;
          padding-right: 24px;
        }
      }
      @media (max-width: 767px) {
        .container-main {
          padding-left: 20px;
          padding-right: 20px;
        }
      }
    }

    /* 左侧竖向导航 (桌面) */
    .side-nav {
      position: fixed;
      left: 0;
      top: 0;
      width: 80px;
      height: 100vh;
      background-color: var(--color-dark);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 32px 0;
      z-index: 50;
      transition: width 0.3s ease;
    }
    .side-nav:hover {
      width: 240px;
    }
    .nav-logo {
      font-weight: 700;
      font-size: 24px;
      color: white;
      letter-spacing: 2px;
      writing-mode: horizontal-tb;
      white-space: nowrap;
      opacity: 0;
      transition: opacity 0.2s;
      margin-bottom: 20px;
    }
    .side-nav:hover .nav-logo {
      opacity: 1;
    }
    .logo-icon {
      font-size: 28px;
      font-weight: 900;
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 48px;
      height: 48px;
    }
    .nav-menu {
      list-style: none;
      padding: 0;
      margin: 0;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 24px;
    }
    .nav-item {
      width: 100%;
      text-align: center;
      position: relative;
    }
    .nav-link {
      color: white;
      font-size: 14px;
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 8px 0;
      transition: color 0.2s;
      white-space: nowrap;
      border-left: 3px solid transparent;
    }
    .side-nav:hover .nav-link {
      justify-content: flex-start;
      padding-left: 24px;
    }
    .nav-link:hover {
      color: var(--color-primary);
      border-left-color: var(--color-primary);
    }
    .nav-indicator {
      display: none;
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 3px;
      height: 20px;
      background-color: var(--color-primary);
    }
    .side-nav:hover .nav-indicator {
      display: block;
    }

    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background-color: var(--color-dark);
      z-index: 60;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
    }
    .mobile-logo {
      font-weight: 700;
      font-size: 20px;
      color: white;
      letter-spacing: 1px;
    }
    #menu-toggle {
      display: none;
    }
    .hamburger {
      display: flex;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 70;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }
    #menu-toggle:checked + .hamburger span:nth-child(1) {
      transform: rotate(45deg) translate(5px, 5px);
    }
    #menu-toggle:checked + .hamburger span:nth-child(2) {
      opacity: 0;
    }
    #menu-toggle:checked + .hamburger span:nth-child(3) {
      transform: rotate(-45deg) translate(5px, -5px);
    }
    .mobile-menu {
      position: fixed;
      top: 56px;
      left: 0;
      width: 100%;
      background: var(--color-dark);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      padding: 40px 0;
      display: none;
      z-index: 55;
    }
    #menu-toggle:checked ~ .mobile-menu {
      display: flex;
    }
    .mobile-menu a {
      color: white;
      font-size: 18px;
      letter-spacing: 2px;
    }

    @media (max-width: 767px) {
      .side-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      body {
        padding-top: 56px;
      }
    }

    /* 内容区偏移 */
    .main-content {
      margin-left: 80px;
      transition: margin-left 0.3s;
    }
    @media (max-width: 1023px) {
      .main-content {
        margin-left: 60px;
      }
    }
    @media (max-width: 767px) {
      .main-content {
        margin-left: 0;
      }
    }

    /* 自定义组件 */
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 767px) {
      .section-padding {
        padding: 60px 0;
      }
    }
    .text-gradient-red {
      background: linear-gradient(135deg, #C8102E 0%, #A00D24 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .card-hover {
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      background: white;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
      border-color: var(--color-primary);
    }
    .btn-primary {
      background-color: var(--color-primary);
      color: white;
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      border: none;
    }
    .btn-primary:hover {
      background-color: var(--color-primary-dark);
      transform: scale(1.02);
    }
    .btn-outline {
      border: 1px solid var(--color-dark);
      color: var(--color-dark);
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      font-weight: 600;
      display: inline-block;
      background: transparent;
    }
    .btn-outline:hover {
      background-color: var(--color-dark);
      color: white;
      transform: scale(1.02);
    }
    .btn-outline-white {
      border: 1px solid white;
      color: white;
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      font-weight: 600;
      background: transparent;
    }
    .btn-outline-white:hover {
      background: white;
      color: var(--color-dark);
    }
    .faq-item {
      border-bottom: 1px solid var(--color-border);
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 0;
      font-weight: 600;
      font-size: 18px;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--color-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #555;
    }
    .faq-toggle {
      display: none;
    }
    .faq-toggle:checked + .faq-question .faq-icon {
      transform: rotate(45deg);
    }
    .faq-toggle:checked ~ .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-icon {
      font-size: 24px;
      transition: transform 0.3s;
      color: var(--color-primary);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--color-dark);
      line-height: 1.2;
    }
    .accent-dot {
      color: var(--color-primary);
      margin-right: 8px;
    }
    @media (max-width: 767px) {
      .stat-number {
        font-size: 36px;
      }
    }