/* roulang page: index */
:root {
      --deep-space: #0B0E1A;
      --deep-space-light: #111627;
      --deep-space-footer: #080B14;
      --star-gold: #F0C060;
      --star-gold-dark: #D4A030;
      --purple-soft: #7B68EE;
      --text-body: #B0B8D0;
      --text-heading: #E8ECF4;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(255, 255, 255, 0.06);
      --card-hover-border: rgba(240, 192, 96, 0.25);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-card-hover: 0 16px 48px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(240, 192, 96, 0.15);
      --input-bg: rgba(255, 255, 255, 0.05);
      --input-border: rgba(255, 255, 255, 0.1);
      --radius-card-lg: 20px;
      --radius-card-md: 16px;
      --radius-card-sm: 12px;
      --radius-btn: 12px;
      --font-heading: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', 'Inter', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--deep-space);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      color: var(--text-heading);
      font-weight: 600;
      letter-spacing: -0.01em;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, input, textarea {
      font-family: inherit;
    }

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

    @media (max-width: 640px) {
      .container-main {
        padding-left: 1rem;
        padding-right: 1rem;
      }
      h1 {
        font-size: 2.25rem !important;
      }
      h2 {
        font-size: 1.75rem !important;
      }
    }

    /* 导航基础样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(11, 14, 26, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      transition: background 0.3s ease;
    }

    .nav-link {
      position: relative;
      font-size: 0.95rem;
      font-weight: 500;
      color: #B0B8D0;
      padding: 0.5rem 0;
      transition: color 0.2s;
    }

    .nav-link:hover,
    .nav-link.active {
      color: #F0C060;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: #F0C060;
      border-radius: 2px;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
    }

    @media (max-width: 767px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
      .mobile-nav-open .mobile-menu {
        display: flex;
      }
    }

    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #F0C060, #D4A030);
      color: #0B0E1A;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      box-shadow: 0 4px 16px rgba(240,192,96,0.3);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 8px 24px rgba(240,192,96,0.5);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid #F0C060;
      color: #F0C060;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      transition: all 0.25s ease;
      cursor: pointer;
    }
    .btn-secondary:hover {
      background: rgba(240,192,96,0.1);
      transform: translateY(-2px);
    }

    .btn-text {
      color: #F0C060;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
      transition: gap 0.2s;
    }
    .btn-text:hover {
      text-decoration: underline;
      gap: 0.5rem;
    }

    /* 卡片通用 */
    .card-premium {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card-lg);
      padding: 2.5rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .card-premium:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-color: var(--card-hover-border);
    }

    .card-medium {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(8px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card-md);
      padding: 2rem;
      box-shadow: 0 4px 16px rgba(0,0,0,0.3);
    }

    .card-small {
      background: rgba(255,255,255,0.03);
      border-radius: var(--radius-card-sm);
      padding: 1.5rem;
      border: 1px solid var(--card-border);
    }

    /* 图标容器 */
    .icon-box {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, rgba(240,192,96,0.2), rgba(123,104,238,0.2));
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #F0C060;
    }

    /* 背景装饰 */
    .star-bg {
      position: relative;
    }
    .star-bg::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(240,192,96,0.04) 0%, transparent 40%),
                  radial-gradient(circle at 70% 80%, rgba(123,104,238,0.06) 0%, transparent 40%);
      pointer-events: none;
    }

    /* FAQ 手风琴 */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-radius: 12px;
      margin-bottom: 1rem;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.05);
      transition: all 0.3s;
    }
    .faq-question {
      padding: 1.25rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: #E8ECF4;
      background: transparent;
      width: 100%;
      text-align: left;
      border: none;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: rgba(255,255,255,0.02);
      color: #B0B8D0;
      padding: 0 1.25rem;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding: 1.25rem;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .faq-item.open {
      box-shadow: 0 8px 24px rgba(0,0,0,0.5);
      background: rgba(255,255,255,0.06);
    }

    /* 表单 */
    .input-field {
      background: var(--input-bg);
      border: 1px solid var(--input-border);
      border-radius: 12px;
      padding: 0.85rem 1rem;
      color: white;
      width: 100%;
      transition: all 0.2s;
    }
    .input-field:focus {
      outline: none;
      border-color: #F0C060;
      box-shadow: 0 0 0 3px rgba(240,192,96,0.2);
    }

    /* 滚动动画辅助 */
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

@keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0px); }
    }
    .floating-img {
      animation: float 6s ease-in-out infinite;
    }
    /* 简单滚动渐现 */
    .fade-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .fade-up.appear {
      opacity: 1;
      transform: translateY(0);
    }