/* roulang page: index */
:root {
      --deep-black: #0A0B0F;
      --surface-dark: #161A1F;
      --border-color: #21262C;
      --text-soft: #B0B8C1;
      --text-muted: #8A929A;
      --gold: #D4AF37;
      --gold-dark: #B4942E;
      --cyan: #00F0FF;
      --cyan-dark: #00C4D4;
      --white: #FFFFFF;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'Inter', 'Roboto', sans-serif;
      --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.5);
      --border-radius-card: 12px;
      --transition-base: all 0.3s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      background-color: var(--deep-black);
      font-family: var(--font-sans);
      color: var(--text-soft);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-sans);
      font-weight: 900;
      letter-spacing: 0.5px;
    }
    
    .font-mono {
      font-family: var(--font-mono);
    }
    
    a {
      text-decoration: none;
      transition: var(--transition-base);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 导航栏 - 白底内容平台风格，但融入暗黑奢华元素 */
    .navbar {
      background: rgba(10, 11, 15, 0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 1px 8px rgba(0, 0, 0, 0.6);
      border-bottom: 1px solid rgba(212, 175, 55, 0.2);
      padding: 0.8rem 0;
      transition: var(--transition-base);
    }
    
    .navbar-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-sans);
      font-weight: 900;
      font-size: 1.6rem;
      background: linear-gradient(135deg, #D4AF37 0%, #FFDF73 70%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    
    .navbar-brand i {
      font-size: 2rem;
      color: var(--gold);
      background: none;
      -webkit-text-fill-color: var(--gold);
    }
    
    .nav-link {
      color: var(--text-muted) !important;
      font-weight: 700;
      margin: 0 0.5rem;
      padding: 0.5rem 1rem !important;
      border-radius: 6px;
      transition: var(--transition-base);
      position: relative;
    }
    
    .nav-link:hover,
    .nav-link.active {
      color: var(--cyan) !important;
      text-shadow: 0 0 12px rgba(0, 240, 255, 0.7);
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--cyan);
      box-shadow: 0 0 15px var(--cyan);
      transition: width 0.3s ease;
    }
    
    .nav-link:hover::after {
      width: 70%;
    }
    
    .btn-gold {
      background: var(--gold);
      color: var(--deep-black);
      font-weight: 700;
      border: none;
      border-radius: 30px;
      padding: 0.6rem 1.8rem;
      transition: var(--transition-base);
      box-shadow: 0 0 15px rgba(212, 175, 55, 0.4);
      letter-spacing: 0.5px;
    }
    
    .btn-gold:hover {
      background: #E0C05A;
      color: #000;
      box-shadow: 0 0 30px rgba(212, 175, 55, 0.8);
      transform: translateY(-2px);
    }
    
    .btn-outline-cyan {
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      font-weight: 700;
      border-radius: 30px;
      padding: 0.6rem 2rem;
      transition: var(--transition-base);
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
    }
    
    .btn-outline-cyan:hover {
      background: var(--cyan);
      color: var(--deep-black);
      box-shadow: 0 0 25px var(--cyan);
      transform: translateY(-2px);
    }
    
    /* Hero 区域 */
    .hero-section {
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, #1A1E26 0%, #0A0B0F 80%);
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      overflow: hidden;
    }
    
    .hero-bg-image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      padding: 0 20px;
    }
    
    .hero-title {
      font-size: 4rem;
      font-weight: 900;
      color: var(--gold);
      text-shadow: 0 0 30px rgba(0,0,0,0.8), 0 0 10px rgba(212,175,55,0.5);
      margin-bottom: 1.5rem;
      letter-spacing: 4px;
    }
    
    .hero-sub {
      font-size: 1.4rem;
      color: #D0D7E0;
      margin-bottom: 2.5rem;
      font-weight: 400;
    }
    
    .btn-group-hero {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    /* 装饰性光效 */
    .light-beam {
      position: absolute;
      top: -20%;
      left: 50%;
      transform: translateX(-50%);
      width: 8px;
      height: 140%;
      background: linear-gradient(to bottom, rgba(0,240,255,0.2), rgba(212,175,55,0.1));
      filter: blur(15px);
      z-index: 1;
    }
    
    /* 通用区块 */
    .section-padding {
      padding: 5rem 0;
    }
    
    .section-title {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--white);
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
    }
    
    .section-title::before {
      content: '';
      display: inline-block;
      width: 6px;
      height: 40px;
      background: var(--cyan);
      margin-right: 18px;
      box-shadow: 0 0 20px var(--cyan);
      border-radius: 4px;
    }
    
    .card-custom {
      background: var(--surface-dark);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius-card);
      padding: 2rem;
      transition: var(--transition-base);
      box-shadow: var(--shadow-card);
      height: 100%;
      position: relative;
      overflow: hidden;
    }
    
    .card-custom:hover {
      transform: translateY(-10px);
      border-color: var(--gold);
      box-shadow: 0 25px 50px rgba(0,0,0,0.7), 0 0 20px rgba(212,175,55,0.3);
    }
    
    .card-custom:hover .card-corner {
      opacity: 1;
    }
    
    .card-corner {
      position: absolute;
      top: 10px;
      left: 10px;
      width: 30px;
      height: 30px;
      border-top: 3px solid var(--cyan);
      border-left: 3px solid var(--cyan);
      opacity: 0;
      transition: opacity 0.3s;
      box-shadow: 0 0 15px var(--cyan);
    }
    
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--cyan);
      text-shadow: 0 0 15px rgba(0,240,255,0.7);
    }
    
    .faq-button {
      background: transparent;
      border: none;
      border-bottom: 1px solid var(--border-color);
      color: var(--text-soft);
      font-weight: 700;
      padding: 1rem 0;
      width: 100%;
      text-align: left;
      transition: 0.3s;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .faq-button i {
      transition: transform 0.3s;
      color: var(--text-muted);
    }
    
    .faq-button[aria-expanded="true"] i {
      transform: rotate(45deg);
      color: var(--gold);
    }
    
    .faq-button[aria-expanded="true"] {
      color: var(--gold);
    }
    
    .footer {
      background: #050609;
      border-top: 2px solid var(--cyan);
      box-shadow: 0 -5px 20px rgba(0,240,255,0.15);
    }
    
    .footer a {
      color: var(--text-soft);
      transition: 0.3s;
    }
    
    .footer a:hover {
      color: var(--cyan);
      transform: translateX(5px);
      display: inline-block;
    }
    
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.8rem;
      }
      .section-title {
        font-size: 2rem;
      }
    }
    
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .section-title::before {
        display: none;
      }
      .navbar-collapse {
        background: rgba(10,11,15,0.98);
        padding: 1rem;
        border-radius: 10px;
      }
    }