/* roulang page: index */
/* ===== CSS 变量与设计令牌 ===== */
    :root {
      --deep-blue: #0B1A2F;
      --starlight-gold: #D4A843;
      --gold-hover: #C49632;
      --paper-bg: #F8F6F2;
      --card-bg: #FFFFFF;
      --text-primary: #1A1A1A;
      --text-secondary: #5A5A5A;
      --border-light: rgba(0, 0, 0, 0.06);
      --glass-bg: rgba(255, 255, 255, 0.72);
      --glass-border: rgba(255, 255, 255, 0.3);
      --shadow-sm: 0 4px 24px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
      --shadow-gold: 0 8px 20px rgba(212, 168, 67, 0.35);
      --radius-card: 20px;
      --radius-btn: 40px;
      --font-serif: 'Noto Serif SC', 'STSong', 'Songti SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    
    /* 全局重置与基础 */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--paper-bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 17px;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, .h2, .font-serif {
      font-family: var(--font-serif);
      font-weight: 600;
      line-height: 1.3;
    }
    
    h1 {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    
    h2 {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 1rem;
    }
    
    .section-padding {
      padding-top: 100px;
      padding-bottom: 100px;
    }
    
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* 按钮系统 */
    .btn {
      font-weight: 600;
      letter-spacing: 0.5px;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      transition: var(--transition-smooth);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
    }
    
    .btn-gold {
      background: var(--starlight-gold);
      color: var(--deep-blue);
      box-shadow: 0 4px 12px rgba(212, 168, 67, 0.2);
    }
    
    .btn-gold:hover {
      background: var(--gold-hover);
      box-shadow: var(--shadow-gold);
      transform: scale(1.03);
      color: var(--deep-blue);
    }
    
    .btn-outline-dark {
      background: transparent;
      border: 1px solid var(--deep-blue);
      color: var(--deep-blue);
    }
    
    .btn-outline-dark:hover {
      background: var(--deep-blue);
      color: white;
      border-color: var(--deep-blue);
    }
    
    .btn-lg {
      padding: 18px 48px;
      font-size: 1.1rem;
    }
    
    /* 卡片样式 */
    .card-custom {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      height: 100%;
    }
    
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
      border-color: rgba(212, 168, 67, 0.25);
    }
    
    .gold-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--starlight-gold);
      border-radius: 50%;
      margin-right: 12px;
      box-shadow: 0 0 10px rgba(212, 168, 67, 0.6);
    }
    
    /* 导航栏 */
    #mainNav {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1030;
      transition: var(--transition-smooth);
      background: rgba(255, 255, 255, 0.25);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.3);
      padding: 12px 0;
    }
    
    #mainNav.scrolled {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }
    
    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--deep-blue) !important;
      letter-spacing: 1px;
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }
    
    .navbar-brand small {
      font-size: 0.7rem;
      font-family: var(--font-sans);
      font-weight: 400;
      color: var(--text-secondary);
      letter-spacing: 0;
      margin-top: -2px;
    }
    
    .nav-link {
      color: var(--deep-blue) !important;
      font-weight: 500;
      margin: 0 4px;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    
    .nav-link:hover {
      color: var(--starlight-gold) !important;
    }
    
    .navbar-toggler {
      border: none;
      color: var(--deep-blue);
      font-size: 1.4rem;
    }
    
    .navbar-toggler:focus {
      box-shadow: none;
    }
    
    /* Hero 区块 */
    #hero {
      min-height: 90vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
      overflow: hidden;
    }
    
    #hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(135deg, rgba(11, 26, 47, 0.8) 0%, rgba(28, 58, 92, 0.75) 100%);
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 20px;
    }
    
    .hero-content h1 {
      animation: fadeInUp 0.8s ease-out;
    }
    
    .hero-content p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
    }
    
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }
    
    /* 痛点卡片装饰 */
    .pain-icon {
      font-size: 2rem;
      color: var(--starlight-gold);
      margin-bottom: 1rem;
    }
    
    .gold-triangle {
      width: 0;
      height: 0;
      border-left: 10px solid var(--starlight-gold);
      border-top: 10px solid transparent;
      position: absolute;
      top: 0;
      left: 0;
      opacity: 0;
      transition: opacity 0.3s;
    }
    
    .card-custom:hover .gold-triangle {
      opacity: 1;
    }
    
    /* 解决方案列表 */
    .solution-list {
      list-style: none;
      padding-left: 0;
    }
    
    .solution-list li {
      display: flex;
      align-items: flex-start;
      margin-bottom: 1.2rem;
      font-size: 1.05rem;
    }
    
    .solution-list i {
      color: var(--starlight-gold);
      font-size: 1.2rem;
      margin-right: 12px;
      margin-top: 3px;
    }
    
    /* 数据卡片 */
    .stat-card {
      background: #FAFAF8;
      border-radius: 12px;
      padding: 2rem 1rem;
      text-align: center;
      border-bottom: 3px solid var(--starlight-gold);
      transition: var(--transition-smooth);
    }
    
    .stat-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--starlight-gold);
      line-height: 1;
      margin-bottom: 0.5rem;
    }
    
    /* 证言卡片 */
    .testimonial-card {
      background: white;
      border-radius: 20px;
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      position: relative;
      border-left: 4px solid var(--starlight-gold);
    }
    
    .avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      object-fit: cover;
      border: 2px solid var(--starlight-gold);
    }
    
    /* FAQ 手风琴 */
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      background: white;
      color: var(--deep-blue);
      box-shadow: none;
    }
    
    .accordion-button:not(.collapsed) {
      background-color: #F0EFEA;
      color: var(--deep-blue);
      box-shadow: none;
    }
    
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--starlight-gold);
    }
    
    .accordion-item {
      border: 1px solid var(--border-light);
      margin-bottom: 12px;
      border-radius: 16px !important;
      overflow: hidden;
    }
    
    .accordion-body {
      background: #FAFAF8;
      border-left: 3px solid var(--starlight-gold);
    }
    
    /* CTA 深色区 */
    #cta {
      background: linear-gradient(135deg, #0B1A2F 0%, #1C3A5C 100%);
      color: white;
    }
    
    /* 页脚 */
    #footer {
      background: #F0EFEA;
      color: var(--text-primary);
    }
    
    .footer-link {
      color: var(--text-secondary);
      text-decoration: none;
      transition: color 0.2s;
    }
    
    .footer-link:hover {
      color: var(--starlight-gold);
    }
    
    .social-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      border: 1px solid var(--deep-blue);
      color: var(--deep-blue);
      margin-right: 8px;
      transition: var(--transition-smooth);
    }
    
    .social-icon:hover {
      background: var(--starlight-gold);
      border-color: var(--starlight-gold);
      color: white;
    }
    
    /* 响应式调整 */
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
      .section-padding { padding: 60px 0; }
      .navbar-collapse { background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); padding: 20px; border-radius: 20px; margin-top: 10px; }
    }
    
    @media (max-width: 576px) {
      .btn { padding: 12px 24px; }
      .hero-content h1 { font-size: 1.9rem; }
    }