/* roulang page: index */
:root {
      --primary-red: #E63946;
      --primary-red-dark: #C1121F;
      --deep-charcoal: #1D1D1D;
      --warm-gold: #F4A261;
      --bg-light: #FAFAFA;
      --bg-white: #FFFFFF;
      --text-body: #4A4A4A;
      --text-muted: #8C8C8C;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 8px;
      --font-ping: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-ping);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航栏 */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--bg-white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary-red);
      letter-spacing: 1px;
      text-decoration: none;
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--deep-charcoal);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      list-style: none;
      align-items: center;
    }
    .nav-menu a {
      text-decoration: none;
      font-weight: 500;
      color: var(--deep-charcoal);
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 6px;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary-red);
    }
    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary-red);
      border-radius: 2px;
    }
    .nav-cta {
      background: var(--primary-red);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      font-size: 15px;
      transition: background 0.2s;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--primary-red-dark);
    }
    .burger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 5px;
      z-index: 1001;
    }
    .burger span {
      width: 26px;
      height: 3px;
      background: var(--deep-charcoal);
      border-radius: 2px;
      transition: 0.3s;
    }
    /* 移动端导航面板 */
    .mobile-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--deep-charcoal);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      gap: 40px;
    }
    .mobile-panel.open {
      transform: translateX(0);
    }
    .mobile-panel a {
      color: white;
      font-size: 24px;
      font-weight: 600;
      text-decoration: none;
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      color: white;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-menu, .nav-cta {
        display: none;
      }
      .burger {
        display: flex;
      }
    }
    /* 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;
      margin-top: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(29,29,29,0.85) 0%, rgba(230,57,70,0.7) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      color: white;
    }
    .hero-tag {
      font-size: 13px;
      letter-spacing: 4px;
      color: var(--warm-gold);
      font-weight: 600;
      margin-bottom: 20px;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-red);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      display: inline-block;
      transition: background 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover { background: var(--primary-red-dark); }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary-red);
    }
    .floating-badge {
      position: absolute;
      right: 8%;
      bottom: 15%;
      width: 80px;
      height: 80px;
      background: linear-gradient(135deg, var(--warm-gold), #e0852c);
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      box-shadow: 0 0 25px rgba(244,162,97,0.7);
      animation: pulse 2s infinite;
      z-index: 2;
    }
    @keyframes pulse {
      0% { transform: scale(1); box-shadow: 0 0 20px rgba(244,162,97,0.6); }
      50% { transform: scale(1.05); box-shadow: 0 0 35px rgba(244,162,97,0.9); }
      100% { transform: scale(1); box-shadow: 0 0 20px rgba(244,162,97,0.6); }
    }
    @media (max-width: 768px) {
      .hero-content h1 { font-size: 32px; }
      .floating-badge { width: 65px; height: 65px; right: 5%; bottom: 10%; }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 36px;
      font-weight: 700;
      color: var(--deep-charcoal);
      margin-bottom: 12px;
    }
    .title-line {
      width: 56px;
      height: 4px;
      background: var(--primary-red);
      margin: 0 auto;
    }
    /* 服务卡片 2x2 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .service-card {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      display: flex;
      height: 320px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      overflow: hidden;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      width: 40%;
      object-fit: cover;
      border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    }
    .service-info {
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      position: relative;
      width: 60%;
    }
    .badge-hot {
      position: absolute;
      top: 20px;
      right: 20px;
      background: var(--warm-gold);
      color: white;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
    }
    .service-info h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--deep-charcoal);
      margin-bottom: 12px;
    }
    .service-info p {
      color: var(--text-body);
      margin-bottom: 20px;
    }
    .text-link {
      color: var(--primary-red);
      font-weight: 600;
      text-decoration: none;
    }
    @media (max-width: 768px) {
      .services-grid { grid-template-columns: 1fr; }
      .service-card { flex-direction: column; height: auto; }
      .service-img { width: 100%; height: 200px; border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
      .service-info { width: 100%; }
    }
    /* 数据勋章 */
    #stats {
      background: linear-gradient(180deg, #FAFAFA 0%, #FDECEC 100%);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 30px;
    }
    .stat-item i {
      font-size: 32px;
      color: var(--primary-red);
      margin-bottom: 16px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary-red);
    }
    .stat-label {
      font-size: 14px;
      color: var(--deep-charcoal);
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    /* 案例卡片 */
    .cases-container {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .case-card {
      display: flex;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      height: 280px;
    }
    .case-card:nth-child(2) {
      transform: translateY(-10px);
    }
    .case-img {
      width: 45%;
      object-fit: cover;
    }
    .case-text {
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .case-tag {
      background: rgba(244,162,97,0.2);
      color: var(--warm-gold);
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      width: fit-content;
      margin-bottom: 12px;
    }
    .case-highlight {
      color: var(--primary-red);
      font-weight: 700;
      margin-top: 10px;
    }
    @media (max-width: 768px) {
      .case-card { flex-direction: column; height: auto; }
      .case-img { width: 100%; height: 200px; }
    }
    /* 流程时间轴 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .process-steps::before {
      content: '';
      position: absolute;
      top: 28px;
      left: 0;
      width: 100%;
      height: 2px;
      border-top: 2px dashed var(--primary-red);
      z-index: 0;
    }
    .step {
      text-align: center;
      z-index: 1;
      flex: 1;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--primary-red);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 22px;
      margin: 0 auto 16px;
    }
    @media (max-width: 768px) {
      .process-steps { flex-direction: column; gap: 40px; }
      .process-steps::before { display: none; }
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: 0.3s;
    }
    .faq-item.active {
      border-left: 4px solid var(--primary-red);
    }
    .faq-q {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      margin-top: 8px;
    }
    .faq-item.active .faq-a {
      max-height: 200px;
    }
    @media (max-width: 768px) {
      .faq-grid { grid-template-columns: 1fr; }
    }
    /* CTA */
    .cta-band {
      background: var(--deep-charcoal);
      background-image: linear-gradient(135deg, rgba(230,57,70,0.2) 0%, rgba(29,29,29,0.9) 100%);
      padding: 80px 0;
    }
    .cta-inner {
      display: flex;
      gap: 60px;
      align-items: center;
    }
    .cta-form input {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      border-radius: var(--radius-btn);
      border: 1px solid var(--border-light);
      background: white;
    }
    .cta-form input:focus {
      border-color: var(--primary-red);
      box-shadow: 0 0 0 3px rgba(230,57,70,0.2);
    }
    @media (max-width: 768px) {
      .cta-inner { flex-direction: column; }
    }
    /* 页脚 */
    footer {
      background: var(--deep-charcoal);
      color: #cccccc;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }