/* roulang page: index */
/* 设计变量 */
    :root {
      --deep-space: #0B0C1E;
      --nebula-purple: #6C3FAA;
      --starlight-gold: #F0C75E;
      --card-bg: #12132F;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B7D1;
      --text-muted: #6A7090;
      --border-glow: rgba(240,199,94,0.15);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --font-heading: "Inter", "SF Pro Display", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--deep-space);
      color: var(--text-secondary);
      line-height: 1.75;
      overflow-x: hidden;
    }

    /* 排版重置 */
    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-heading);
      color: var(--text-primary);
      font-weight: 600;
    }

    a {
      color: var(--starlight-gold);
      text-decoration: none;
      transition: all 0.2s ease;
    }
    a:hover {
      color: #F5D78A;
    }

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

    /* 自定义容器微调 */
    .container-custom {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 64px 0;
      }
    }

    /* 导航栏 - 沉浸式半透明 */
    .navbar {
      background: rgba(11,12,30,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-glow);
      transition: background 0.3s ease;
      padding: 0.8rem 0;
    }
    .navbar.scrolled {
      background: rgba(11,12,30,0.95);
    }
    .navbar-brand {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--starlight-gold) !important;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand i {
      font-size: 2rem;
      color: var(--starlight-gold);
    }
    .navbar-nav .nav-link {
      color: var(--text-secondary) !important;
      font-weight: 500;
      margin: 0 10px;
      transition: color 0.2s;
      position: relative;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--starlight-gold) !important;
    }
    .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 24px;
      height: 2px;
      background: var(--starlight-gold);
      border-radius: 2px;
    }
    .btn-primary-custom {
      background: var(--starlight-gold);
      color: var(--deep-space);
      border: none;
      border-radius: 50px;
      padding: 10px 28px;
      font-weight: 600;
      transition: all 0.2s ease;
      box-shadow: 0 4px 15px rgba(240,199,94,0.2);
    }
    .btn-primary-custom:hover {
      background: #F5D78A;
      box-shadow: 0 0 24px rgba(240,199,94,0.5);
      transform: scale(1.03);
      color: var(--deep-space);
    }
    .btn-outline-gold {
      border: 1.5px solid var(--starlight-gold);
      color: var(--starlight-gold);
      border-radius: 50px;
      padding: 10px 28px;
      font-weight: 600;
      background: transparent;
      transition: all 0.2s ease;
    }
    .btn-outline-gold:hover {
      background: rgba(240,199,94,0.08);
      color: var(--starlight-gold);
    }
    /* 移动端菜单样式 */
    .offcanvas {
      background: var(--deep-space);
    }
    .offcanvas .nav-link {
      font-size: 1.2rem;
      padding: 12px 20px;
      color: var(--text-secondary) !important;
    }
    .offcanvas .nav-link:hover {
      color: var(--starlight-gold) !important;
    }
    .navbar-toggler {
      border-color: var(--starlight-gold);
      color: var(--starlight-gold);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(240,199,94,1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    /* Hero 首屏 */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: radial-gradient(circle at 50% 30%, rgba(108,63,170,0.3) 0%, var(--deep-space) 80%);
      position: relative;
      overflow: hidden;
    }
    .star-particle {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.7;
      animation: float 6s infinite alternate;
      box-shadow: 0 0 8px var(--starlight-gold);
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      100% { transform: translateY(-20px); }
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
    }
    .hero-content h1 {
      font-size: 3.5rem;
      font-weight: 700;
      letter-spacing: 0.02em;
      margin-bottom: 1.5rem;
      animation: fadeInUp 0.8s ease;
    }
    .hero-content p {
      font-size: 1.25rem;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 2rem;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--starlight-gold);
      animation: bounce 2s infinite;
    }
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-10px); }
      60% { transform: translateX(-50%) translateY(-5px); }
    }
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 区块交替背景 */
    .bg-alternate {
      background-color: #12132F;
    }

    /* 标题装饰 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      text-align: center;
      margin-bottom: 1rem;
      position: relative;
      padding-bottom: 20px;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background: var(--starlight-gold);
      border-radius: 2px;
    }
    .section-subtitle {
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 3rem;
    }

    /* 卡片系统 */
    .card-feature {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: 16px;
      padding: 32px 24px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
      height: 100%;
    }
    .card-feature:hover {
      border-color: rgba(240,199,94,0.3);
      box-shadow: 0 12px 40px rgba(0,0,0,0.6);
      transform: translateY(-5px);
    }
    .card-feature .icon-circle {
      width: 56px;
      height: 56px;
      border: 1px solid var(--starlight-gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--starlight-gold);
      font-size: 1.5rem;
    }
    .card-feature h3 {
      font-size: 1.5rem;
      margin-bottom: 1rem;
    }

    .card-case {
      background: var(--card-bg);
      border-radius: 16px;
      border: 1px solid var(--border-glow);
      overflow: hidden;
      transition: all 0.3s;
    }
    .card-case:hover {
      border-color: rgba(240,199,94,0.3);
    }
    .card-case .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .card-case .case-img::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(transparent 60%, rgba(11,12,30,0.8));
    }
    .card-case .card-body {
      padding: 24px;
    }

    /* 数据数字 */
    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--starlight-gold);
      font-family: var(--font-heading);
    }

    /* FAQ 手风琴 */
    .accordion-item {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      margin-bottom: 12px;
      border-radius: 12px !important;
    }
    .accordion-button {
      background: transparent;
      color: var(--text-primary);
      font-weight: 500;
      border-radius: 12px !important;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(240,199,94,0.05);
      color: var(--starlight-gold);
      box-shadow: none;
    }
    .accordion-button::after {
      filter: brightness(0) invert(1);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, rgba(108,63,170,0.7) 0%, rgba(11,12,30,0.9) 100%);
      border-radius: 24px;
      padding: 64px;
      text-align: center;
    }

    /* Footer */
    footer {
      border-top: 1px solid var(--border-glow);
      padding: 60px 0 30px;
    }
    .footer-newsletter input {
      background: transparent;
      border: 1px solid var(--starlight-gold);
      color: white;
      border-radius: 50px;
      padding: 10px 20px;
      width: 100%;
    }
    .footer-newsletter button {
      border-radius: 50px;
      border: 1px solid var(--starlight-gold);
      background: var(--starlight-gold);
      color: var(--deep-space);
      font-weight: 600;
      padding: 10px 24px;
    }

    @media (max-width: 768px) {
      .hero-content h1 { font-size: 2.2rem; }
      .stat-number { font-size: 1.8rem; }
      .cta-banner { padding: 40px 24px; }
    }