/* roulang page: index */
:root {
      --primary: #6C3CFC;
      --primary-glow: rgba(108, 60, 252, 0.3);
      --secondary: #00F0A8;
      --secondary-glow: rgba(0, 240, 168, 0.4);
      --ink: #0E0B16;
      --ink-light: #4A4458;
      --surface-light: #F2EFFA;
      --bg: #F9F8FD;
      --white: #FFFFFF;
      --border-light: rgba(108, 60, 252, 0.12);
      --shadow-card: 0 8px 30px rgba(108, 60, 252, 0.08);
      --shadow-hover: 0 18px 40px rgba(108, 60, 252, 0.15);
      --radius-xl: 32px;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-xs: 8px;
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: 'Space Mono', 'Courier New', monospace;
      --transition: 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--ink-light);
      margin: 0;
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-sans);
      color: var(--ink);
      margin-top: 0;
    }

    h1 {
      font-weight: 800;
      font-size: clamp(3.2rem, 8vw, 5.5rem);
      letter-spacing: -0.02em;
      line-height: 1.1;
    }

    h2 {
      font-weight: 700;
      font-size: clamp(2.2rem, 5vw, 3.2rem);
      letter-spacing: -0.01em;
      margin-bottom: 1rem;
    }

    h3 {
      font-weight: 600;
      font-size: 1.4rem;
      letter-spacing: -0.01em;
    }

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

    a:hover {
      color: var(--secondary);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .section-padding {
      padding: 120px 0;
    }

    .bg-ink {
      background-color: var(--ink);
      color: var(--surface-light);
    }

    .bg-ink h2, .bg-ink h3 {
      color: var(--white);
    }

    .text-center {
      text-align: center;
    }

    /* 浮动 Dock 导航 */
    .floating-nav {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 1100px;
      z-index: 100;
      background: rgba(255, 255, 255, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 100px;
      padding: 8px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 10px 30px rgba(108, 60, 252, 0.1);
      border: 1px solid rgba(255, 255, 255, 0.5);
      transition: all var(--transition);
    }

    .logo {
      font-family: var(--font-sans);
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
      display: flex;
      align-items: baseline;
      gap: 4px;
      color: var(--ink);
      white-space: nowrap;
    }

    .logo .lewin {
      color: var(--primary);
      font-weight: 800;
    }

    .logo .lewan {
      color: var(--ink);
      font-weight: 500;
    }

    .nav-links {
      display: flex;
      gap: 1.75rem;
      list-style: none;
      margin: 0;
      padding: 0;
      align-items: center;
    }

    .nav-links a {
      color: var(--ink);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition);
      padding: 6px 4px;
    }

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

    .nav-cta {
      background: var(--primary);
      color: var(--white) !important;
      padding: 10px 22px !important;
      border-radius: 100px;
      font-weight: 600;
      transition: all var(--transition);
      box-shadow: 0 4px 12px var(--primary-glow);
      font-size: 0.9rem;
    }

    .nav-cta:hover {
      background: var(--secondary);
      color: var(--ink) !important;
      box-shadow: 0 0 18px var(--secondary-glow);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--ink);
      cursor: pointer;
      padding: 0 8px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 90px;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 2rem;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero-text h1 .highlight {
      background: linear-gradient(135deg, var(--secondary) 0%, #00d68f 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      position: relative;
      display: inline-block;
    }

    .hero-text p {
      font-size: 1.25rem;
      color: var(--ink-light);
      max-width: 480px;
      margin: 1.5rem 0 2rem;
    }

    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: 100px;
      font-weight: 600;
      font-size: 1rem;
      transition: all var(--transition);
      box-shadow: 0 8px 20px var(--primary-glow);
      display: inline-block;
    }

    .btn-primary:hover {
      background: #5a2de0;
      box-shadow: 0 0 24px var(--secondary-glow);
      color: white;
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--secondary);
      padding: 14px 36px;
      border-radius: 100px;
      font-weight: 600;
      font-size: 1rem;
      transition: all var(--transition);
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--secondary);
      color: var(--ink);
      border-color: var(--secondary);
    }

    .hero-image {
      flex: 1 1 480px;
      position: relative;
      height: 500px;
      border-radius: var(--radius-xl);
      overflow: hidden;
      clip-path: polygon(8% 0, 100% 0, 92% 100%, 0% 100%);
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      box-shadow: var(--shadow-hover);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(108,60,252,0.2) 0%, rgba(0,240,168,0.15) 100%);
      mix-blend-mode: overlay;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 3rem;
    }

    .service-card {
      background: var(--white);
      padding: 40px 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      border: 1px solid var(--border-light);
    }

    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .service-icon {
      font-size: 2.8rem;
      color: var(--primary);
      margin-bottom: 1.8rem;
      transition: color 0.3s, transform 0.3s;
      display: inline-block;
    }

    .service-card:hover .service-icon {
      color: var(--secondary);
      transform: scale(1.1) rotate(2deg);
    }

    /* 数据优势 */
    .stats-row {
      display: flex;
      justify-content: center;
      gap: 4rem;
      flex-wrap: wrap;
      text-align: center;
    }

    .stat-item .stat-number {
      font-family: var(--font-mono);
      font-size: 4rem;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.2;
    }

    .stat-label {
      color: #B2A9C5;
      font-size: 1.1rem;
      margin-top: 0.5rem;
    }

    /* 案例卡片 */
    .cases-row {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
      margin-top: 2.5rem;
    }

    .case-card {
      flex: 1 1 400px;
      background: var(--surface-light);
      border-radius: var(--radius-lg);
      display: flex;
      overflow: hidden;
      transition: all var(--transition);
    }

    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      width: 45%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img {
      transform: scale(1.05);
    }

    .case-info {
      padding: 2rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .case-tag {
      background: var(--primary);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      align-self: flex-start;
      margin-bottom: 0.8rem;
    }

    .arrow-icon {
      margin-top: 1rem;
      transition: transform var(--transition);
      font-size: 1.4rem;
    }

    .case-card:hover .arrow-icon {
      transform: translateX(8px);
      color: var(--secondary);
    }

    /* 流程 */
    .steps-container {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-top: 3rem;
      position: relative;
    }

    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }

    .step-circle {
      width: 70px;
      height: 70px;
      background: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      box-shadow: 0 0 0 4px rgba(108,60,252,0.2);
      transition: all var(--transition);
    }

    .step.active .step-circle {
      box-shadow: 0 0 20px var(--secondary-glow);
      color: var(--secondary);
    }

    .step-line {
      position: absolute;
      top: 35px;
      left: 70%;
      width: 60%;
      border-top: 2px dashed var(--border-light);
      z-index: -1;
    }

    /* FAQ */
    .faq-accordion .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.5rem 0;
    }

    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      color: var(--ink);
      font-size: 1.1rem;
    }

    .faq-icon {
      color: var(--secondary);
      margin-right: 1rem;
    }

    .faq-toggle {
      font-size: 1.8rem;
      color: var(--primary);
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding-left: 2.2rem;
      color: var(--ink-light);
    }

    .accordion-item.active .faq-toggle {
      transform: rotate(45deg);
    }

    .accordion-item.active .faq-answer {
      max-height: 300px;
      margin-top: 0.8rem;
    }

    /* 联系表单 */
    .contact-form input, .contact-form textarea {
      border-radius: var(--radius-xs);
      border: 1px solid #ddd;
      padding: 14px;
      width: 100%;
      margin-bottom: 1rem;
      font-family: var(--font-sans);
    }

    .btn-submit {
      background: var(--primary);
      color: white;
      border: none;
      padding: 15px 35px;
      border-radius: 100px;
      font-weight: 700;
      width: 100%;
      transition: all var(--transition);
    }

    .btn-submit:hover {
      background: var(--secondary);
      color: var(--ink);
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 3rem;
      padding-top: 2rem;
      text-align: center;
      color: #B2A9C5;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-container { flex-wrap: wrap; gap: 2rem; }
      .step-line { display: none; }
    }

    @media (max-width: 768px) {
      .floating-nav { width: 95%; padding: 8px 20px; }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-content { flex-direction: column; }
      .hero-image { height: 350px; width: 100%; clip-path: none; border-radius: var(--radius-lg); }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .cases-row { flex-direction: column; }
    }

    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
    }