/* roulang page: index */
:root {
      --deep-purple: #1E0A2E;
      --dark-purple: #220F33;
      --gold: #D4AF37;
      --amber-gold: #F5B042;
      --crimson: #8B1E2B;
      --jade-green: #0B2B26;
      --warm-white: #F7F5F0;
      --light-champagne: #FFFBF2;
      --charcoal: #2C2C2C;
      --deep-charcoal: #1A1A1A;
      --pale-gold: #C5A86A;
      --soft-gray: #FAF8F5;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
      --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.06);
      --shadow-card-hover: 0 16px 40px rgba(0, 0, 0, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-badge: 20px;
      --transition-base: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--charcoal);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 自定义字体权重 */
    .font-number {
      font-family: 'Inter', 'PingFang SC', sans-serif;
      font-weight: 700;
    }

    /* 金色下划线装饰 */
    .gold-underline {
      display: inline-block;
      width: 60px;
      height: 3px;
      background-color: var(--gold);
      margin-top: 0.75rem;
    }

    /* 导航栏样式 */
    #nav {
      background-color: rgba(30, 10, 46, 0.92);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .nav-link {
      color: var(--pale-gold);
      font-weight: 500;
      transition: var(--transition-base);
      font-size: 0.95rem;
    }

    .nav-link:hover {
      color: var(--gold);
    }

    .btn-gold {
      background-color: var(--gold);
      color: var(--deep-purple);
      font-weight: 700;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 10px rgba(212, 175, 55, 0.3);
    }

    .btn-gold:hover {
      background-color: var(--amber-gold);
      box-shadow: 0 8px 18px rgba(245, 176, 66, 0.4);
      transform: translateY(-1px);
    }

    .btn-outline-light {
      border: 1.5px solid rgba(255,255,255,0.7);
      color: white;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      transition: var(--transition-base);
      background: transparent;
    }

    .btn-outline-light:hover {
      background-color: rgba(255,255,255,0.08);
      border-color: white;
    }

    /* Hero 背景纹理 */
    .hero-bg {
      background: radial-gradient(circle at 30% 40%, #2a1140 0%, #0e0418 90%);
      position: relative;
    }

    .hero-bg::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: linear-gradient(rgba(212, 175, 55, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(212, 175, 55, 0.05) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
    }

    /* 卡片样式 */
    .card {
      background-color: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      padding: 2rem;
      height: 100%;
    }

    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border-bottom: 3px solid var(--gold);
    }

    .dark-card {
      background-color: var(--jade-green);
      border-radius: var(--radius-card);
      padding: 2rem;
      color: white;
      transition: var(--transition-base);
    }

    /* 数据区块 */
    .data-block {
      background-color: var(--jade-green);
      background-image: radial-gradient(circle at 20% 30%, rgba(212,175,55,0.1) 0%, transparent 45%);
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.08);
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      padding: 1.2rem 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: var(--deep-charcoal);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      color: var(--charcoal);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 脉冲动画 */
    @keyframes pulse-gold {
      0% { box-shadow: 0 0 0 0 rgba(212, 175, 55, 0.5); }
      70% { box-shadow: 0 0 0 15px rgba(212, 175, 55, 0); }
      100% { box-shadow: 0 0 0 0 rgba(212, 175, 55, 0); }
    }
    .pulse-cta {
      animation: pulse-gold 2s infinite;
    }

    /* 移动端菜单 */
    #mobile-menu {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background-color: rgba(30, 10, 46, 0.98);
      backdrop-filter: blur(20px);
    }
    #mobile-menu.open {
      max-height: 500px;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 1.2rem;
        padding-right: 1.2rem;
      }
      h1 {
        font-size: 2.2rem !important;
      }
      h2 {
        font-size: 1.9rem !important;
      }
      .hero-bg {
        min-height: 550px;
      }
    }