/* roulang page: index */
:root {
      --primary: #0F4C5C;
      --primary-dark: #0B3A47;
      --primary-deep: #0A3642;
      --accent: #D4A853;
      --bg-white: #FFFFFF;
      --bg-light: #F8FAFC;
      --bg-dark: #1E293B;
      --text-heading: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-light: #CBD5E1;
      --border-light: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-pill: 50px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08);
      --shadow-button: 0 4px 10px rgba(15,76,92,0.25);
      --font-heading: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-body: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      color: var(--text-body);
      background-color: var(--bg-white);
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      color: var(--text-heading);
      margin-top: 0;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航栏 */
    .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);
      box-shadow: 0 12px 24px rgba(0,0,0,0.02);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--primary);
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-body);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .search-box {
      display: flex;
      align-items: center;
      background: var(--bg-light);
      border-radius: 20px;
      padding: 6px 16px;
      margin-right: 12px;
      color: var(--text-muted);
      font-size: 0.85rem;
    }
    .search-box i {
      margin-right: 8px;
      font-size: 0.9rem;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.85rem;
      width: 140px;
      color: var(--text-body);
    }
    .search-box input::placeholder {
      color: var(--text-muted);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.85rem;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: var(--shadow-button);
      display: inline-block;
      text-align: center;
      line-height: 1.2;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 18px rgba(15,76,92,0.35);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(15,76,92,0.05);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--primary);
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-muted);
      font-size: 1rem;
    }
    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 100px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 0 0 55%;
      position: relative;
      padding-left: 20px;
      border-left: 4px solid var(--primary);
    }
    .hero-left h1 {
      font-size: 2.75rem;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .hero-left .subtitle {
      font-size: 1.125rem;
      color: var(--text-muted);
      margin-bottom: 28px;
    }
    .hero-buttons {
      display: flex;
      gap: 12px;
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }
    .hero-right img {
      border-radius: var(--radius-lg);
      box-shadow: 0 25px 40px rgba(0,0,0,0.08);
      animation: float 6s infinite ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
      100% { transform: translateY(0); }
    }
    .decor-shape {
      position: absolute;
      bottom: -20px;
      left: -20px;
      width: 100px;
      height: 100px;
      background: rgba(15,76,92,0.08);
      border-radius: 24px;
      z-index: -1;
    }
    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .adv-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .adv-card i {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .adv-card h3 {
      font-size: 1.35rem;
      margin-bottom: 12px;
    }
    .adv-card p {
      color: var(--text-body);
      margin-bottom: 20px;
    }
    .adv-stat {
      font-weight: 700;
      color: var(--accent);
      font-size: 1.2rem;
    }
    /* 服务交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 100px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
    }
    .service-img img {
      border-radius: var(--radius-lg);
      box-shadow: 0 10px 25px rgba(0,0,0,0.06);
    }
    .service-text {
      flex: 1;
    }
    .service-text h2 {
      font-size: 2rem;
      margin-bottom: 16px;
    }
    .service-text ul {
      list-style: none;
      padding: 0;
      margin: 20px 0;
    }
    .service-text li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 12px;
      font-weight: 500;
    }
    .service-text li i {
      color: var(--primary);
      font-size: 1.2rem;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 0.95rem;
    }
    /* 案例网格 */
    .cases-bg {
      background: var(--bg-light);
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-card img {
      height: 200px;
      object-fit: cover;
    }
    .case-info {
      padding: 20px;
    }
    .badge {
      background: rgba(15,76,92,0.1);
      color: var(--primary);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-info h4 {
      font-size: 1.1rem;
      margin-bottom: 10px;
    }
    .kpi {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--accent);
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--primary);
      border-radius: 50%;
      color: white;
      font-weight: 700;
      font-size: 1.3rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }
    .step h4 {
      margin-bottom: 8px;
    }
    .step p {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .dotted-line {
      position: absolute;
      top: 28px;
      left: 25%;
      width: 50%;
      border-top: 2px dashed var(--border-light);
      z-index: -1;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 12px;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 0;
      font-weight: 600;
      font-size: 1.05rem;
      cursor: pointer;
      color: var(--text-heading);
    }
    .faq-icon {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      border: 2px solid var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary);
      transition: 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F1F5F9;
      border-radius: var(--radius-sm);
      padding: 0 16px;
      margin-bottom: 8px;
    }
    .faq-answer p {
      padding: 16px 0;
      margin: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    .faq-item.active .faq-icon {
      background: var(--primary);
      color: white;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0F4C5C, #0A3642);
      color: white;
      text-align: center;
      padding: 80px 20px;
      border-radius: 0;
    }
    .cta-banner h2 {
      color: white;
      font-size: 2rem;
      margin-bottom: 16px;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      display: inline-block;
      margin: 24px 0 12px;
      transition: var(--transition);
    }
    .btn-white:hover {
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(0,0,0,0.2);
      color: var(--primary-dark);
    }
    /* 页脚 */
    .footer {
      background: var(--bg-dark);
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer a {
      color: var(--text-light);
      display: block;
      margin-bottom: 8px;
    }
    .footer a:hover {
      color: white;
      text-decoration: underline;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      font-size: 0.8rem;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .hero-left, .hero-right { flex: 1; }
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .cases-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .search-box { display: none; }
      .menu-toggle { display: block; }
      .advantages-grid, .cases-grid { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .process-steps { flex-direction: column; gap: 30px; }
      .dotted-line { display: none; }
    }