/* roulang page: index */
:root {
      --primary-blue: #1A3B5C;
      --deep-blue: #0F2440;
      --champagne-gold: #C8A96E;
      --champagne-light: #D4AF37;
      --bg-white: #FFFFFF;
      --bg-light-gray: #F5F7FA;
      --bg-light-blue: #EBF0F5;
      --text-main: #1A1A1A;
      --text-secondary: #5A6A7E;
      --text-weak: #8A9BAE;
      --border-light: #E2E8F0;
      --red-alert: #E53E3E;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 12px 32px rgba(26,59,92,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-white);
      color: var(--text-main);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, .title-font {
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
    }

    /* 左侧竖向导航 */
    .side-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 220px;
      height: 100vh;
      background-color: var(--deep-blue);
      color: white;
      display: flex;
      flex-direction: column;
      z-index: 1000;
      box-shadow: 2px 0 12px rgba(0,0,0,0.15);
      transition: transform 0.3s ease;
    }
    .nav-brand {
      padding: 32px 20px 20px;
      text-align: center;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .nav-brand .logo-main {
      font-size: 28px;
      font-weight: 700;
      letter-spacing: 1px;
      color: white;
    }
    .nav-brand .logo-sub {
      font-size: 14px;
      color: var(--champagne-gold);
      margin-top: 4px;
      letter-spacing: 2px;
    }
    .nav-links {
      flex: 1;
      padding: 32px 0;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .nav-link {
      display: flex;
      align-items: center;
      padding: 14px 28px;
      color: rgba(255,255,255,0.8);
      font-size: 16px;
      font-weight: 500;
      transition: all 0.2s;
      position: relative;
      border-left: 3px solid transparent;
    }
    .nav-link i {
      width: 24px;
      margin-right: 14px;
      font-size: 18px;
      text-align: center;
    }
    .nav-link:hover {
      background: rgba(255,255,255,0.08);
      color: white;
    }
    .nav-link.active {
      color: white;
      border-left-color: var(--champagne-gold);
      background: rgba(200,169,110,0.08);
    }
    .nav-footer {
      padding: 20px 24px;
      border-top: 1px solid rgba(255,255,255,0.1);
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 12px;
      color: rgba(255,255,255,0.6);
    }
    .trust-badge {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .trust-badge i {
      font-size: 18px;
      color: var(--champagne-gold);
    }

    /* 主内容区偏移 */
    .main-content {
      margin-left: 220px;
      width: calc(100% - 220px);
      max-width: 1200px;
    }
    .container-limited {
      max-width: 980px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #D4AF37, #C8A96E);
      color: white;
      font-weight: 600;
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-size: 16px;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(200,169,110,0.4);
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #B8943A, #A8864A);
      box-shadow: 0 8px 18px rgba(200,169,110,0.5);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-blue);
      color: var(--primary-blue);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(26,59,92,0.05);
    }

    /* 卡片组件 */
    .card-standard {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      padding: 32px;
      transition: all 0.3s ease;
      height: 100%;
    }
    .card-standard:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-8px);
    }
    .pain-card {
      background: #FFF5F5;
      border-left: 4px solid var(--red-alert);
      border-radius: 12px;
      padding: 28px;
      box-shadow: 0 2px 12px rgba(229,62,62,0.06);
    }

    /* 星级 */
    .stars {
      color: var(--champagne-gold);
      letter-spacing: 2px;
    }

    /* 粒子动画 */
    @keyframes float {
      0% { transform: translateY(0px) scale(1); opacity: 0.3; }
      50% { transform: translateY(-20px) scale(1.2); opacity: 0.7; }
      100% { transform: translateY(0px) scale(1); opacity: 0.3; }
    }
    .particle {
      position: absolute;
      background: rgba(200,169,110,0.6);
      width: 6px;
      height: 6px;
      border-radius: 50%;
      animation: float 3s infinite ease-in-out;
      pointer-events: none;
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary-blue);
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .side-nav {
        width: 72px;
      }
      .side-nav .nav-brand .logo-main {
        font-size: 20px;
      }
      .side-nav .nav-link span {
        display: none;
      }
      .side-nav .nav-link i {
        margin: 0 auto;
        font-size: 22px;
      }
      .side-nav .nav-link {
        justify-content: center;
        padding: 16px 0;
      }
      .main-content {
        margin-left: 72px;
        width: calc(100% - 72px);
      }
    }
    @media (max-width: 768px) {
      .side-nav {
        transform: translateX(-100%);
        width: 260px;
      }
      .side-nav.mobile-open {
        transform: translateX(0);
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
      .mobile-header {
        display: flex;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 64px;
        background: var(--deep-blue);
        align-items: center;
        justify-content: space-between;
        padding: 0 20px;
        z-index: 999;
      }
      .hamburger {
        color: white;
        font-size: 26px;
        cursor: pointer;
      }
    }