/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #E8380F;
      --primary-dark: #C02A0A;
      --secondary: #1A1A2E;
      --accent: #FFB800;
      --warm-light: #F5F0E8;
      --gray-mid: #2D2D3A;
      --text-light: #F5F0E8;
      --text-dim: rgba(255,255,255,0.7);
      --shadow-card: 0 8px 30px rgba(0,0,0,0.25);
      --shadow-hover: 0 16px 40px rgba(232,56,15,0.3);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-tag: 30px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--secondary);
      color: #fff;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航系统 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: var(--transition-smooth);
      background: transparent;
      padding: 16px 0;
    }

    .navbar.scrolled {
      background: var(--secondary);
      box-shadow: 0 2px 20px rgba(0,0,0,0.5);
      padding: 12px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      text-decoration: none;
    }

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

    .nav-links a {
      color: #fff;
      text-decoration: none;
      font-size: 16px;
      font-weight: 500;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--accent);
    }

    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: var(--secondary);
      box-shadow: 0 -2px 15px rgba(0,0,0,0.6);
      z-index: 50;
      padding: 8px 16px;
      justify-content: space-around;
      align-items: center;
      border-top: 1px solid rgba(255,255,255,0.08);
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(255,255,255,0.65);
      text-decoration: none;
      font-size: 12px;
      gap: 4px;
      transition: 0.2s;
    }

    .mobile-bottom-nav a i {
      font-size: 20px;
    }

    .mobile-bottom-nav a.active {
      color: var(--primary);
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
      scroll-margin-top: 80px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #fff;
    }

    .section-sub {
      font-size: 16px;
      color: var(--text-dim);
      margin-bottom: 48px;
      max-width: 700px;
    }

    /* 卡片系统 */
    .card-hover {
      background: var(--secondary);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      border: 1px solid rgba(255,255,255,0.05);
    }

    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      text-decoration: none;
      font-size: 16px;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
      text-decoration: none;
      font-size: 16px;
    }

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

    /* 动画 */
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .animate-fadein {
      animation: fadeInUp 0.8s ease forwards;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .container { padding: 0 20px; }
      .section-title { font-size: 28px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-bottom-nav { display: flex; }
      .navbar { padding: 10px 0; }
      .logo { font-size: 24px; }
      
      section { padding: 60px 0; scroll-margin-top: 60px; }
      .hero-title { font-size: 32px !important; }
      
      .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr) !important; }
      .compare-container { flex-direction: column; }
    }

    @media (max-width: 480px) {
      .grid-4, .grid-3 { grid-template-columns: 1fr !important; }
      .hero-buttons { flex-direction: column; align-items: center; gap: 16px; }
      .btn-primary, .btn-outline { width: 100%; text-align: center; }
      .cta-form { flex-direction: column; }
    }