/* roulang page: index */
/* 自定义设计变量与全局样式 */
    :root {
      --primary-charcoal: #1a1a1a;
      --accent-red: #e63946;
      --accent-gold: #f4a261;
      --bg-warm-white: #faf8f5;
      --card-white: #ffffff;
      --text-dark: #1c1c1c;
      --text-muted: #5c5c5c;
      --border-light: #e8e4df;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-red-glow: 0 0 0 2px #e63946, 0 12px 40px rgba(230,57,70,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 4px;
      --radius-container: 16px;
      --transition-smooth: 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
      --transition-fast: 0.2s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm-white);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    .number-font {
      font-family: var(--font-number);
    }

    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航栏沉浸式 */
    #navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      padding: 0 40px;
      transition: background-color 0.35s ease, backdrop-filter 0.35s ease, box-shadow 0.3s;
      background-color: transparent;
      backdrop-filter: blur(0px);
    }

    #navbar.scrolled {
      background-color: var(--primary-charcoal);
      backdrop-filter: blur(12px);
      box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    }

    .nav-menu a {
      color: white;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      transition: color 0.2s;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background-color: var(--accent-red);
      transition: width 0.25s ease;
    }

    .nav-menu a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background-color: var(--accent-red);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      transition: background-color 0.25s, transform 0.2s;
      letter-spacing: 0.5px;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background-color: #c5303c;
      transform: scale(1.03);
    }

    .btn-outline {
      border: 2px solid var(--accent-red);
      color: var(--accent-red);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      background: transparent;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background-color: var(--accent-red);
      color: white;
    }

    /* 卡片hover动效 */
    .card-hover {
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }

    /* 产品卡片图片缩放 */
    .product-img-wrap img {
      transition: transform 0.4s ease;
    }
    .product-card:hover .product-img-wrap img {
      transform: scale(1.05);
    }

    /* FAQ箭头旋转 */
    .faq-arrow {
      transition: transform 0.35s ease;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    /* 脉冲动画CTA */
    @keyframes pulse-ring {
      0% { box-shadow: 0 0 0 0 rgba(230,57,70,0.5); }
      70% { box-shadow: 0 0 0 15px rgba(230,57,70,0); }
      100% { box-shadow: 0 0 0 0 rgba(230,57,70,0); }
    }
    .pulse-btn {
      animation: pulse-ring 2s infinite;
    }

    /* 移动端菜单 */
    @media (max-width: 767px) {
      #navbar {
        padding: 0 20px;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background-color: var(--primary-charcoal);
        flex-direction: column;
        align-items: center;
        padding: 24px 0;
        display: none;
      }
      .nav-menu.open {
        display: flex;
      }
    }