/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary-deep: #1A5E3A;
      --primary-bright: #1F6B44;
      --accent-gold: #F5A623;
      --bg-warm: #F8FAF5;
      --bg-deep: #0F1A14;
      --bg-dark-section: #1A2E22;
      --text-main: #1A1F1C;
      --text-sub: #5C6B62;
      --text-white: #FFFFFF;
      --card-glass-bg: rgba(255, 255, 255, 0.72);
      --card-border: rgba(26, 94, 58, 0.12);
      --shadow-sm: 0 8px 32px rgba(26, 94, 58, 0.08);
      --shadow-hover: 0 12px 40px rgba(26, 94, 58, 0.15);
      --radius-card: 16px;
      --radius-btn: 50px;
      --glass-blur: blur(18px);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", system-ui, -apple-system, sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 40px;
      padding-right: 40px;
    }
    
    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
    }
    
    /* 字体层级 */
    h1, h2, h3, .h1, .h2, .h3 {
      font-weight: 700;
      letter-spacing: -0.01em;
    }
    
    h1, .h1 {
      font-size: clamp(40px, 6vw, 72px);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.1;
      color: var(--text-white);
    }
    
    h2, .h2 {
      font-size: clamp(28px, 4vw, 44px);
      font-weight: 700;
      line-height: 1.25;
    }
    
    h3, .h3 {
      font-size: 20px;
      font-weight: 600;
      line-height: 1.4;
    }
    
    .text-body {
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-sub);
    }
    
    .text-small {
      font-size: 13px;
      font-weight: 500;
      letter-spacing: 0.04em;
      text-transform: uppercase;
    }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
    }
    
    .navbar.scrolled {
      background: rgba(248, 250, 245, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 22px;
      font-weight: 700;
      color: var(--text-white);
      transition: color 0.25s;
    }
    
    .navbar.scrolled .logo {
      color: var(--primary-deep);
    }
    
    .logo-icon {
      width: 28px;
      height: 28px;
      stroke: var(--accent-gold);
      fill: none;
      stroke-width: 2;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    
    .nav-link {
      font-size: 15px;
      color: rgba(255,255,255,0.85);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
      font-weight: 500;
    }
    
    .navbar.scrolled .nav-link {
      color: var(--text-sub);
    }
    
    .nav-link:hover,
    .nav-link.active {
      color: var(--primary-deep);
    }
    
    .navbar.scrolled .nav-link:hover,
    .navbar.scrolled .nav-link.active {
      color: var(--primary-deep);
    }
    
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background-color: var(--accent-gold);
      border-radius: 2px;
    }
    
    .nav-cta-btn {
      background: var(--primary-deep);
      color: white;
      height: 36px;
      padding: 0 20px;
      border-radius: 50px;
      font-size: 14px;
      font-weight: 600;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s, box-shadow 0.2s;
      margin-left: 8px;
    }
    
    .nav-cta-btn:hover {
      background: var(--primary-bright);
      box-shadow: 0 0 16px rgba(26,94,58,0.6);
    }
    
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    
    @media (max-width: 767px) {
      .nav-links, .nav-cta-btn {
        display: none;
      }
      .navbar {
        padding: 0 20px;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 20px;
        right: 20px;
        background: rgba(15, 26, 20, 0.92);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-radius: 40px;
        padding: 8px 20px;
        justify-content: space-around;
        z-index: 999;
        box-shadow: 0 8px 24px rgba(0,0,0,0.4);
      }
      .mobile-nav-item {
        color: rgba(255,255,255,0.7);
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        transition: 0.2s;
      }
      .mobile-nav-item i {
        font-size: 18px;
      }
      .mobile-nav-item.active {
        color: var(--accent-gold);
      }
    }
    
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary-deep);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 24px rgba(26,94,58,0.5);
      transition: all 0.3s ease;
      border: none;
      letter-spacing: 0.3px;
    }
    
    .btn-primary:hover {
      background: var(--primary-bright);
      box-shadow: 0 0 36px rgba(26,94,58,0.7);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      border-radius: var(--radius-btn);
      padding: 12px 34px;
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: 0.25s;
    }
    
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }
    
    .btn-white-outline {
      border-color: white;
      color: white;
    }
    .btn-white-outline:hover {
      background: white;
      color: var(--primary-deep);
    }
    
    .text-link {
      color: var(--primary-deep);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      position: relative;
    }
    .text-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-deep);
      transition: width 0.25s;
    }
    .text-link:hover::after {
      width: 100%;
    }
    
    /* 卡片与玻璃效果 */
    .glass-card {
      background: var(--card-glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid rgba(255,255,255,0.5);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    /* 动态粒子背景 (Hero) */
    .hero-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    
    /* 板块间距 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(26,94,58,0.08);
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(26,94,58,0.03);
      border-radius: 8px;
      margin-bottom: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px;
    }
    
    /* 斜切分隔 */
    .wave-divider {
      height: 60px;
      background: var(--bg-warm);
      position: relative;
    }
    
    /* 数字倾斜 */
    .skew-number {
      transform: skewX(-4deg);
      display: inline-block;
      color: var(--accent-gold);
      font-weight: 800;
    }