/* roulang page: index */
:root {
      --primary: #F15A24;
      --primary-dark: #D94A1A;
      --accent: #00C896;
      --gray-dark: #2E2E2E;
      --track-white: #FAFAFA;
      --text-title: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --border-light: #EEEEEE;
      --white: #FFFFFF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", system-ui, sans-serif;
      --transition-base: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background: var(--white);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }

    h1, h2, h3 {
      color: var(--text-title);
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 34px;
    }

    h3 {
      font-size: 22px;
    }

    .container {
      width: 90%;
      max-width: 1200px;
      margin: 0 auto;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      z-index: 50;
      padding: 14px 0;
      transition: var(--transition-base);
    }

    .header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 16px;
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
      font-weight: 500;
      color: var(--text-title);
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -4px;
      height: 2px;
      width: 0;
      background: var(--primary);
      transition: 0.2s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-title);
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
    }

    /* 首屏 */
    .hero {
      padding: 160px 0 100px;
      background: linear-gradient(120deg, #FFFFFF 0%, #FAFAFA 100%);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      right: -5%;
      top: -10%;
      width: 550px;
      height: 550px;
      background: radial-gradient(circle, rgba(241,90,36,0.08) 0%, transparent 70%);
      border-radius: 50%;
      z-index: 0;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-image {
      flex: 1 1 45%;
      text-align: right;
    }

    .hero-image img {
      max-width: 100%;
      border-radius: 28px;
      object-fit: cover;
    }

    .hero h1 {
      margin-bottom: 1.25rem;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 2rem;
      max-width: 500px;
    }

    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-block;
      padding: 13px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: background 0.2s, color 0.2s, border 0.2s;
      cursor: pointer;
      text-align: center;
      border: 2px solid transparent;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

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

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .hero-stats {
      display: flex;
      gap: 2.5rem;
      margin-top: 2.5rem;
      flex-wrap: wrap;
    }

    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .bg-light {
      background: var(--track-white);
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-title h2 {
      margin-bottom: 16px;
    }

    .section-title p {
      color: var(--text-muted);
      max-width: 620px;
      margin: 0 auto;
      font-size: 17px;
    }

    /* 服务横卡 */
    .service-card {
      display: flex;
      gap: 32px;
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      padding: 32px;
      margin-bottom: 32px;
      transition: transform var(--transition-base), box-shadow var(--transition-base);
      align-items: center;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .service-img {
      width: 130px;
      height: 130px;
      border-radius: 12px;
      object-fit: cover;
      flex-shrink: 0;
    }

    .service-info h3 {
      margin-bottom: 10px;
    }

    .service-points {
      list-style: none;
      margin-top: 12px;
    }

    .service-points li {
      position: relative;
      padding-left: 20px;
      color: var(--text-body);
      margin-bottom: 6px;
    }

    .service-points li::before {
      content: "•";
      color: var(--primary);
      position: absolute;
      left: 0;
      font-weight: bold;
    }

    /* 优势区块 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .big-numbers {
      display: flex;
      flex-direction: column;
      gap: 36px;
    }

    .big-number-item h3 {
      font-size: 48px;
      color: var(--accent);
    }

    .big-number-item p {
      color: var(--text-muted);
    }

    .advantage-list {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .advantage-row {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .icon-circle {
      width: 40px;
      height: 40px;
      background: rgba(241,90,36,0.1);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      flex-shrink: 0;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      border: 1px solid #eee;
    }

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

    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    .case-body {
      padding: 20px;
    }

    .tag {
      display: inline-block;
      background: rgba(241,90,36,0.1);
      color: var(--primary);
      font-size: 13px;
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      text-align: center;
      flex-wrap: wrap;
      position: relative;
    }

    .step-item {
      flex: 1;
      min-width: 110px;
      position: relative;
    }

    .step-number {
      font-size: 56px;
      font-weight: 700;
      color: rgba(241,90,36,0.2);
      line-height: 1;
    }

    .step-title {
      font-weight: 700;
      margin: 8px 0 4px;
    }

    .connector {
      display: none;
    }

    /* 常见问题 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      font-weight: 600;
      padding: 20px 0;
      display: flex;
      align-items: center;
      cursor: pointer;
      position: relative;
      color: var(--text-title);
    }

    .faq-question::before {
      content: '';
      width: 4px;
      height: 20px;
      background: var(--primary);
      border-radius: 2px;
      margin-right: 16px;
      flex-shrink: 0;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-left: 20px;
      margin-bottom: 0;
    }

    .faq-answer.open {
      max-height: 220px;
      margin-bottom: 16px;
    }

    /* CTA */
    .cta-box {
      background: var(--primary);
      border-radius: 20px;
      color: white;
      text-align: center;
      padding: 70px 20px;
    }

    .cta-box h2 {
      color: white;
      margin-bottom: 14px;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      margin-top: 24px;
    }

    .btn-white:hover {
      background: #f0f0f0;
    }

    .footer {
      background: var(--gray-dark);
      color: #AAAAAA;
      padding: 70px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    .footer a {
      color: #AAAAAA;
    }

    .footer a:hover {
      color: white;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 50px;
      padding-top: 24px;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .advantages-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero-image { margin-top: 30px; }
      .service-card { flex-direction: column; }
      .cases-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .steps { gap: 24px; }
    }

    @media (max-width: 520px) {
      h1 { font-size: 30px; }
      h2 { font-size: 26px; }
      .footer-grid { grid-template-columns: 1fr; }
    }

    .mobile-menu.active {
      display: flex;
      flex-direction: column;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(10px);
      padding: 30px;
      gap: 20px;
      font-size: 18px;
      z-index: 40;
    }