/* roulang page: index */
/* ----- 设计变量 & 基础重置 ----- */
    :root {
      --deep-blue: #0A1929;
      --dark-blue: #0F2744;
      --champagne-gold: #C5A059;
      --champagne-light: #D4AF37;
      --glass-bg: rgba(15, 39, 68, 0.4);
      --glass-bg-light: rgba(255, 255, 255, 0.06);
      --text-light: #FFFFFF;
      --text-muted: #B0C4DE;
      --text-dark: #1A202C;
      --text-gray: #4A5568;
      --border-gold: rgba(197, 160, 89, 0.25);
      --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.25);
      --shadow-glow: 0 0 22px rgba(197, 160, 89, 0.5);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-pill: 50px;
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-muted);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    
    .container {
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }
    
    /* 主要按钮 */
    .btn-primary {
      background: linear-gradient(135deg, #C5A059, #D4AF37);
      color: #0A1929;
      font-weight: 700;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-pill);
      box-shadow: 0 0 18px rgba(197, 160, 89, 0.45);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      letter-spacing: 0.5px;
      font-size: 1.05rem;
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(197, 160, 89, 0.8);
      transform: scale(1.04);
      background: linear-gradient(135deg, #D4AF37, #E5C07B);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--champagne-gold);
      color: var(--champagne-gold);
      font-weight: 600;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-pill);
    }
    
    .btn-outline:hover {
      background: rgba(197, 160, 89, 0.12);
      border-color: var(--champagne-light);
      color: var(--champagne-light);
    }
    
    /* 玻璃拟态卡片 */
    .glass-card {
      background: rgba(15, 39, 68, 0.45);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--border-gold);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    
    .glass-card:hover {
      transform: translateY(-6px);
      border-color: rgba(197, 160, 89, 0.5);
      box-shadow: 0 20px 40px rgba(0,0,0,0.4), 0 0 18px rgba(197,160,89,0.3);
    }
    
    /* 区块标题 */
    .section-title {
      font-size: 2.7rem;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 1.2rem;
      letter-spacing: -0.5px;
      position: relative;
      display: inline-block;
    }
    
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 0;
      width: 65%;
      height: 3px;
      background: linear-gradient(90deg, var(--champagne-gold), transparent);
      border-radius: 4px;
    }
    
    .section-subtitle {
      font-size: 1.15rem;
      color: #B0C4DE;
      margin-bottom: 3rem;
      max-width: 700px;
    }
    
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10, 25, 41, 0.82);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(197, 160, 89, 0.3);
      transition: background 0.3s;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.8rem 2rem;
      max-width: 1350px;
      margin: 0 auto;
    }
    
    .logo {
      font-size: 1.7rem;
      font-weight: 800;
      color: var(--champagne-gold);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .logo i {
      font-size: 2rem;
      color: var(--champagne-light);
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
    }
    
    .nav-links a {
      color: #B0C4DE;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 0.3rem 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -3px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--champagne-gold);
      transition: 0.3s;
      box-shadow: 0 0 8px var(--champagne-gold);
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--champagne-gold);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    
    .menu-toggle {
      display: none;
      font-size: 1.8rem;
      color: var(--champagne-gold);
      background: transparent;
      border: none;
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 70px;
        right: -100%;
        flex-direction: column;
        background: rgba(10, 25, 41, 0.96);
        backdrop-filter: blur(20px);
        width: 75%;
        max-width: 300px;
        height: 100vh;
        padding: 2.5rem;
        gap: 2.2rem;
        transition: 0.4s ease;
        border-left: 1px solid var(--border-gold);
      }
      .nav-links.active {
        right: 0;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links .btn-primary {
        width: 100%;
        justify-content: center;
      }
    }
    
    /* Hero 区域 */
    .hero {
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, rgba(197,160,89,0.08) 0%, #0A1929 75%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.28;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 850px;
    }
    .hero h1 {
      font-size: 4rem;
      font-weight: 800;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.8rem;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .hero .highlight {
      color: var(--champagne-gold);
    }
    .hero p {
      font-size: 1.3rem;
      color: #CCD9E6;
      margin-bottom: 2.5rem;
    }
    
    @media (max-width: 768px) {
      .hero h1 { font-size: 2.8rem; }
    }
    
    /* 通用区块 */
    section {
      padding: 5.5rem 0;
    }
    
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2.2rem;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2.2rem;
    }
    
    @media (max-width: 900px) {
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
    }
    
    /* 统计数字 */
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--champagne-gold);
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      background: rgba(15, 39, 68, 0.5);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-gold);
      border-radius: 16px;
      margin-bottom: 1rem;
      overflow: hidden;
      transition: 0.3s;
    }
    .faq-question {
      padding: 1.3rem 2rem;
      font-weight: 700;
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(0,0,0,0.2);
      color: #B0C4DE;
      padding: 0 2rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1.2rem 2rem;
    }
    
    footer {
      background: #0A1929;
      border-top: 1px solid rgba(197,160,89,0.25);
      padding: 3.5rem 0 1.5rem;
    }