/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-dark: #1B5E20;
      --bg-deep: #0A0F0A;
      --bg-card: rgba(255, 255, 255, 0.03);
      --glass-bg: rgba(18, 25, 18, 0.6);
      --text-main: #FFFFFF;
      --text-body: #B0BEC5;
      --text-muted: #78909C;
      --border-light: rgba(0, 230, 118, 0.15);
      --border-hover: rgba(0, 230, 118, 0.4);
      --glow: 0 0 20px rgba(0, 230, 118, 0.5);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "SF Pro Display", sans-serif;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 15, 10, 0.75);
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: 1px;
      text-decoration: none;
    }

    .logo span {
      margin-left: 8px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      text-decoration: none;
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #FFFFFF;
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 10px var(--primary);
    }

    .btn-nav {
      background: var(--primary);
      color: #0A0F0A;
      font-weight: 700;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.3s;
      box-shadow: 0 0 15px rgba(0, 230, 118, 0.4);
      font-size: 14px;
    }

    .btn-nav:hover {
      background: #1BFF8B;
      box-shadow: 0 0 30px rgba(0, 230, 118, 0.7);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--primary);
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 70%;
      height: 100vh;
      background: rgba(10, 15, 10, 0.95);
      backdrop-filter: blur(30px);
      z-index: 1001;
      display: flex;
      flex-direction: column;
      padding: 80px 30px;
      gap: 24px;
      transition: right 0.4s ease;
    }

    .mobile-menu.open {
      right: 0;
    }

    .mobile-menu a {
      color: var(--text-body);
      font-size: 18px;
      text-decoration: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: #0A0F0A;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 0 20px rgba(0, 230, 118, 0.4);
      transition: all 0.3s;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: #1BFF8B;
      box-shadow: 0 0 35px rgba(0, 230, 118, 0.7);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: all 0.3s;
    }

    .btn-outline:hover {
      background: rgba(0, 230, 118, 0.1);
    }

    /* 卡片玻璃拟态 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
      transition: all 0.3s;
    }

    .glass-card:hover {
      transform: translateY(-8px);
      border-color: var(--border-hover);
      box-shadow: 0 8px 40px rgba(0, 230, 118, 0.15);
    }

    .section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      .section {
        padding: 70px 0;
      }
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .text-muted {
      color: var(--text-muted);
    }

    .text-glow {
      color: var(--primary);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A0F0A 0%, #1B2A1B 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-bg {
      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: 0.5;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .floating-badge {
      position: absolute;
      right: 20px;
      bottom: 30px;
      background: var(--glass-bg);
      backdrop-filter: blur(15px);
      border: 1px solid var(--border-light);
      padding: 12px 24px;
      border-radius: 40px;
      color: white;
      font-weight: 600;
    }

    @media (max-width: 768px) {
      .hero-content {
        text-align: center;
        margin: 0 auto;
      }
      .floating-badge {
        right: 10px;
        bottom: 20px;
      }
    }

    /* 数据计数器 */
    .counter-number {
      font-size: 56px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.2;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .faq-question {
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      line-height: 1.8;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .faq-item.active .faq-question i {
      transform: rotate(180deg);
    }

    .footer {
      background: #060A06;
      border-top: 1px solid rgba(0,230,118,0.1);
      padding: 60px 0 30px;
    }