/* roulang page: index */
:root {
      --primary: #E64A19;
      --primary-dark: #C63D14;
      --primary-hover: #D84315;
      --neon-green: #00E676;
      --neon-green-hover: #00C853;
      --charcoal: #1E1E1E;
      --charcoal-light: #2C2C2C;
      --track-white: #F5F5F7;
      --bg-offwhite: #FAFAFA;
      --white: #FFFFFF;
      --text-body: #4A4A4A;
      --text-muted: #6B6B6B;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.05);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
      --shadow-primary: 0 8px 20px rgba(230,74,25,0.2);
      --radius-card: 16px;
      --radius-btn: 40px;
      --radius-sm: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", "Roboto", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--charcoal);
      line-height: 1.6;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      z-index: 100;
      transition: var(--transition);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      letter-spacing: 2px;
      color: var(--charcoal);
      display: flex;
      align-items: center;
      gap: 6px;
      transform: skewX(-5deg);
    }
    .logo span {
      color: var(--primary);
      font-weight: 900;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 600;
      font-size: 15px;
      color: var(--charcoal);
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 15px;
      transition: var(--transition);
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: var(--shadow-primary);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(230,74,25,0.3);
    }
    .badge-hot {
      background: #D32F2F;
      color: white;
      font-size: 12px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 20px;
      margin-left: 6px;
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.7; transform: scale(1.05); }
      100% { opacity: 1; transform: scale(1); }
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--charcoal);
      border-radius: 2px;
    }
    /* 移动端菜单 */
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .nav-cta .btn-primary { padding: 10px 20px; font-size: 14px; }
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      padding: 24px;
      box-shadow: var(--shadow-md);
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      padding: 12px 0;
      font-weight: 600;
      border-bottom: 1px solid #eee;
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.3) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: clamp(36px, 7vw, 60px);
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.4);
    }
    .hero h1 .accent {
      color: var(--neon-green);
      border-bottom: 3px solid var(--neon-green);
    }
    .hero p {
      font-size: 20px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-outline-light {
      border: 2px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: var(--transition);
    }
    .btn-outline-light:hover {
      background: white;
      color: var(--primary);
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 800;
      color: var(--charcoal);
      margin-bottom: 16px;
      display: inline-block;
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--neon-green);
      margin-top: 8px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 48px;
    }
    /* 卡片网格 */
    .grid-3, .grid-4 {
      display: grid;
      gap: 28px;
    }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border-light);
      text-align: center;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-primary);
      border-color: var(--primary);
    }
    .card-icon {
      font-size: 40px;
      margin-bottom: 20px;
      color: var(--primary);
    }
    .card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    /* 场景图文 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-text {
      flex: 1;
    }
    .scenario-img {
      flex: 1;
      border-radius: 32px;
      overflow: hidden;
      box-shadow: var(--shadow-lg);
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    .case-card {
      background: #F9F9FB;
      border-radius: 20px;
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .stars { color: var(--primary); }
    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .price-card {
      background: white;
      border-radius: 24px;
      padding: 36px 24px;
      border: 2px solid transparent;
      text-align: center;
      transition: var(--transition);
    }
    .price-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-primary);
      transform: scale(1.02);
    }
    .price {
      font-size: 48px;
      font-weight: 800;
      color: var(--charcoal);
    }
    /* FAQ */
    .faq-list {
      max-width: 760px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #ddd;
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 700;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s;
      color: #555;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    .cta-banner {
      background: linear-gradient(135deg, #E64A19, #C63D14);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    /* 页脚 */
    .footer {
      background: #1E1E1E;
      color: #C0C0C0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .grid-3, .grid-4, .pricing-grid, .case-grid { grid-template-columns: 1fr; }
      .scenario-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      .nav-cta .btn-primary span { display: none; }
      .hero { text-align: center; }
    }