/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-glow: rgba(123, 47, 247, 0.7);
      --secondary: #00F0FF;
      --accent: #FF4D00;
      --dark-bg: #0B0C10;
      --card-bg: rgba(31, 31, 43, 0.8);
      --card-border: rgba(123, 47, 247, 0.2);
      --text-main: #FFFFFF;
      --text-muted: #B0B0C0;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-glow: 0 4px 24px rgba(123, 47, 247, 0.25);
      --font-title: 'Orbitron', 'Rajdhani', system-ui;
      --font-body: 'Inter', 'Noto Sans SC', system-ui;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--dark-bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航基础 */
    .navbar {
      transition: all 0.3s ease;
      backdrop-filter: blur(0px);
      background: transparent;
    }
    .navbar.scrolled {
      background: rgba(11, 12, 16, 0.9);
      backdrop-filter: blur(16px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.6);
    }
    .nav-link {
      position: relative;
      color: #e0e0e0;
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--secondary);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: white;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    /* 卡片与组件 */
    .card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
    }
    .card:hover {
      border-color: var(--secondary);
      box-shadow: 0 0 28px rgba(0, 240, 255, 0.25);
      transform: translateY(-4px);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-md);
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.25s;
      box-shadow: 0 0 12px var(--primary-glow);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #8f50ff;
      box-shadow: 0 0 24px var(--primary-glow);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      border-radius: var(--radius-md);
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.25s;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 16px rgba(0,240,255,0.5);
    }
    .accent-btn {
      background: var(--accent);
      color: white;
      border: none;
      border-radius: var(--radius-md);
      padding: 0.8rem 2rem;
      font-weight: 700;
      transition: 0.3s;
      box-shadow: 0 0 14px rgba(255, 77, 0, 0.6);
    }
    .accent-btn:hover {
      box-shadow: 0 0 32px rgba(255, 77, 0, 0.9);
      background: #ff6a2c;
    }
    .gradient-text {
      background: linear-gradient(to right, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .stat-number {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 3.5rem;
      line-height: 1.2;
      background: linear-gradient(180deg, #fff 0%, #b0b0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    /* 背景与装饰 */
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      background: radial-gradient(circle at 20% 30%, rgba(11,12,16,0.7) 0%, rgba(11,12,16,0.9) 90%);
    }
    canvas#particles {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      pointer-events: none;
    }
    .faq-item {
      border-bottom: 1px solid rgba(123,47,247,0.3);
    }
    .faq-question {
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    input, textarea, select {
      background: #1a1a24;
      border: 1px solid #3a3a4a;
      color: white;
      border-radius: 8px;
      padding: 0.8rem;
      width: 100%;
      transition: 0.2s;
    }
    input:focus, textarea:focus, select:focus {
      outline: none;
      border-color: var(--secondary);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    @media (max-width: 768px) {
      .stat-number {
        font-size: 2.5rem;
      }
      h1 {
        font-size: 2.4rem !important;
      }
    }