/* roulang page: index */
:root {
      --primary: #FF5A1F;
      --primary-dark: #E04A0F;
      --deep-black: #1A1A1A;
      --gray-bg: #F5F6FA;
      --white: #FFFFFF;
      --text-main: #1F2329;
      --text-weak: #86909C;
      --border-light: #E5E8EF;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04), 0 2px 6px rgba(0,0,0,0.02);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", system-ui, sans-serif;
      --spacing-page: 24px;
      --max-width: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--gray-bg);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    ul {
      list-style: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 var(--spacing-page);
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      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;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      width: 24px;
      height: 24px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"/></svg>') center/contain no-repeat;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"/></svg>') center/contain no-repeat;
      background: var(--primary);
      display: inline-block;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
    }
    .nav-menu a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
      border-radius: 2px;
    }
    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: var(--white);
      border-top: 1px solid var(--border-light);
      z-index: 110;
      justify-content: space-around;
      align-items: center;
      padding: 0 8px;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.02);
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 10px;
      color: var(--text-weak);
      gap: 4px;
      transition: color 0.2s;
    }
    .mobile-nav-item.active {
      color: var(--primary);
    }
    .mobile-nav-icon {
      width: 20px;
      height: 20px;
      background: currentColor;
      mask-size: contain;
      -webkit-mask-size: contain;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
    }
    /* 首屏 */
    .hero {
      height: 100vh;
      min-height: 650px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      margin-top: 0;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,26,0.7) 0%, rgba(255,90,31,0.35) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 800px;
      padding: 0 24px;
      animation: fadeUp 0.9s ease;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s ease;
      border: none;
      cursor: pointer;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(255,90,31,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255,90,31,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
      transform: translateY(-2px);
    }
    @keyframes fadeUp {
      0% { opacity: 0; transform: translateY(20px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.4px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-weak);
      margin-bottom: 48px;
    }
    /* 核心优势 非对称栅格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .adv-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .adv-card.large {
      grid-row: span 2;
    }
    .adv-icon {
      width: 48px;
      height: 48px;
      background: #F5F6FA;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
    }
    .adv-card h4 {
      font-size: 18px;
      margin-bottom: 12px;
    }
    .adv-card p {
      color: var(--text-weak);
      font-size: 14px;
      line-height: 1.6;
    }
    /* 功能标签页 */
    .features-block {
      display: flex;
      gap: 32px;
      align-items: flex-start;
    }
    .tab-nav {
      width: 200px;
      display: flex;
      flex-direction: column;
      flex-shrink: 0;
    }
    .tab-item {
      padding: 16px 20px;
      font-size: 16px;
      font-weight: 500;
      color: var(--text-weak);
      border-left: 3px solid transparent;
      cursor: pointer;
      transition: all 0.2s;
      background: transparent;
    }
    .tab-item.active {
      color: var(--primary);
      border-left-color: var(--primary);
      background: rgba(255,90,31,0.04);
    }
    .tab-content {
      flex: 1;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .tab-panel {
      display: none;
    }
    .tab-panel.active {
      display: block;
    }
    .tab-img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 24px;
      background: #eee;
    }
    /* 横向滚动场景 */
    .scroll-x {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 12px;
      scrollbar-width: thin;
      -webkit-overflow-scrolling: touch;
    }
    .scroll-x::-webkit-scrollbar {
      height: 6px;
    }
    .scroll-x::-webkit-scrollbar-thumb {
      background: #ccc;
      border-radius: 6px;
    }
    .scene-card {
      min-width: 300px;
      height: 200px;
      border-radius: 16px;
      background-size: cover;
      background-position: center;
      position: relative;
      flex-shrink: 0;
      overflow: hidden;
    }
    .scene-card::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    }
    .scene-text {
      position: absolute;
      bottom: 16px;
      left: 16px;
      color: white;
      z-index: 2;
      font-weight: 600;
    }
    /* 案例交错 */
    .case-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 64px;
    }
    .case-row.reverse {
      flex-direction: row-reverse;
    }
    .case-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      height: 280px;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-info {
      flex: 1;
    }
    .case-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary);
    }
    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: center;
    }
    .price-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all 0.2s;
      border: 2px solid transparent;
    }
    .price-card.featured {
      border-color: var(--primary);
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .price {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary);
      margin: 16px 0;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0 32px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-weak);
      font-size: 14px;
    }
    .faq-item.open .faq-answer {
      max-height: 150px;
      padding-top: 12px;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
    }
    .footer {
      background: var(--deep-black);
      color: #86909C;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer a:hover {
      color: var(--primary);
    }
    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: 1fr 1fr; }
      .pricing-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .site-header .nav-menu { display: none; }
      .hamburger { display: block; }
      .mobile-nav { display: flex; }
      .hero h1 { font-size: 32px; }
      .advantages-grid { grid-template-columns: 1fr; }
      .features-block { flex-direction: column; }
      .tab-nav { width: 100%; flex-direction: row; overflow-x: auto; }
      .faq-grid { grid-template-columns: 1fr; }
      .case-row, .case-row.reverse { flex-direction: column; }
      section { padding: 60px 0; }
    }