/* roulang page: index */
:root {
      --primary: #E8453A;
      --primary-hover: #c9302c;
      --secondary: #1E1E24;
      --bg-warm: #FAF9F7;
      --accent-yellow: #F5B642;
      --text-main: #1A1A1A;
      --text-secondary: #5A5A5A;
      --text-weak: #8C8C8C;
      --card-bg: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 6px 20px rgba(0,0,0,0.08);
      --border-light: #E8E5E1;
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --max-width: 1200px;
      --header-height: 72px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button {
      cursor: pointer;
      font-family: inherit;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #fff;
      z-index: 50;
      height: var(--header-height);
      display: flex;
      align-items: center;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      transition: box-shadow var(--transition);
    }
    .site-header.scrolled {
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--secondary);
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary);
    }
    .logo-text strong {
      color: var(--primary);
    }
    .nav-menu {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-menu a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: color var(--transition), border-color var(--transition);
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      display: inline-block;
      transition: background var(--transition), transform var(--transition);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: background var(--transition), color var(--transition);
    }
    .btn-outline:hover {
      background: rgba(232,69,58,0.1);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      background: none;
      border: none;
      color: var(--secondary);
    }
    /* 移动端导航 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: #fff;
      box-shadow: -4px 0 20px rgba(0,0,0,0.1);
      z-index: 100;
      padding: 2rem 1.5rem;
      display: flex;
      flex-direction: column;
      gap: 1.8rem;
      transition: right 0.3s ease;
    }
    .mobile-menu.open {
      right: 0;
    }
    .mobile-menu a {
      font-size: 1.1rem;
      font-weight: 500;
      color: var(--text-main);
      border-bottom: 1px solid var(--border-light);
      padding-bottom: 0.5rem;
    }
    .overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.4);
      z-index: 99;
      display: none;
    }
    .overlay.show {
      display: block;
    }
    /* Hero */
    .hero-section {
      padding: calc(var(--header-height) + 4rem) 0 5rem;
      background: linear-gradient(135deg, #1E1E24 0%, rgba(232,69,58,0.08) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-text h1 {
      font-size: clamp(2.2rem, 5vw, 3rem);
      font-weight: 700;
      line-height: 1.2;
      color: #fff;
      margin-bottom: 1.2rem;
    }
    .hero-text h1 span {
      color: var(--accent-yellow);
    }
    .hero-sub {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.85);
      max-width: 520px;
      margin-bottom: 2rem;
    }
    .cta-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 45%;
      background: rgba(255,255,255,0.1);
      border-radius: 20px;
      padding: 1rem;
      backdrop-filter: blur(2px);
    }
    .hero-image img {
      border-radius: 12px;
      width: 100%;
      height: auto;
    }
    .trust-bar {
      margin-top: 2.5rem;
      display: flex;
      gap: 2rem;
      color: rgba(255,255,255,0.7);
      font-size: 0.9rem;
    }
    /* 通用板块 */
    .section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
      color: var(--secondary);
    }
    .section-desc {
      color: var(--text-secondary);
      max-width: 680px;
      margin-bottom: 2.5rem;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
      border-color: rgba(232,69,58,0.2);
    }
    .icon-circle {
      width: 52px;
      height: 52px;
      background: rgba(232,69,58,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    .card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    .card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1 1 48%;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 4px 14px rgba(0,0,0,0.05);
    }
    .solution-text {
      flex: 1 1 48%;
    }
    .tag {
      background: var(--accent-yellow);
      color: #1E1E24;
      font-weight: 600;
      font-size: 0.8rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 0.8rem;
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 1.5rem;
    }
    .case-card {
      background: #F5F3F0;
      border-radius: 12px;
      padding: 1.8rem;
      border-left: 4px solid var(--primary);
    }
    .case-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
    }
    /* 定价 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 1.5rem;
      align-items: start;
    }
    .pricing-card {
      background: #fff;
      border-radius: 16px;
      padding: 2rem;
      box-shadow: 0 4px 14px rgba(0,0,0,0.04);
      text-align: center;
      transition: all 0.2s;
      border: 1px solid #eee;
    }
    .pricing-card.recommended {
      transform: translateY(-10px);
      box-shadow: 0 14px 28px rgba(0,0,0,0.08);
      border-top: 4px solid var(--accent-yellow);
      position: relative;
    }
    .badge {
      background: var(--accent-yellow);
      color: #1E1E24;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 0.5rem;
    }
    .price {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      margin: 0.8rem 0;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1rem 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 1.05rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.8rem;
    }
    /* 尾屏CTA */
    .cta-footer {
      background: linear-gradient(135deg, #1E1E24 0%, #E8453A 90%);
      color: #fff;
      text-align: center;
      padding: 4rem 1.5rem;
      border-radius: 24px;
      margin: 3rem 0;
    }
    .footer {
      background: #1E1E24;
      color: #B0B0B0;
      padding: 3rem 0 1.5rem;
    }
    @media (max-width: 1024px) {
      .grid-3, .case-grid, .pricing-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .solution-row {
        flex-direction: column;
      }
      .solution-row.reverse {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-sub { margin: 0 auto 1.5rem; }
      .cta-group { justify-content: center; }
      .grid-3, .case-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
    }