/* roulang page: index */
:root {
      --primary: #0A0E27;
      --primary-soft: #1A1F3A;
      --accent: #FF4655;
      --accent-hover: #E03443;
      --accent-glow: rgba(255,70,85,0.4);
      --bg-page: #F8FAFC;
      --bg-light: #F1F5F9;
      --card-bg: #FFFFFF;
      --text-primary: #0A0E27;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --text-light: #CBD5E1;
      --border-light: rgba(10,14,39,0.08);
      --shadow-sm: 0 1px 3px rgba(10,14,39,0.04), 0 6px 16px rgba(10,14,39,0.06);
      --shadow-hover: 0 12px 28px rgba(10,14,39,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

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

    /* 导航 SaaS 命令栏 */
    .mk-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(10,14,39,0.08);
      padding: 0.75rem 0;
      transition: background 0.2s ease;
    }

    .nav-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
      white-space: nowrap;
    }
    .logo i {
      color: var(--accent);
      margin-right: 0.25rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      transition: color 0.2s;
      font-size: 0.95rem;
    }

    .nav-links a:hover {
      color: var(--accent);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: transparent;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-pill);
      padding: 0.4rem 1rem;
      color: var(--text-muted);
      font-size: 0.9rem;
      gap: 0.5rem;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      width: 100px;
      font-size: 0.9rem;
    }
    .search-box i {
      color: var(--text-muted);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
      font-size: 0.95rem;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      border-color: var(--accent);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 0 20px var(--accent-glow);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(10,14,39,0.05);
    }

    .btn-white {
      background: white;
      color: var(--accent);
      border-color: white;
      font-weight: 700;
    }
    .btn-white:hover {
      background: #f0f0f0;
    }

    /* 移动端汉堡 */
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--primary);
      cursor: pointer;
      background: none;
      border: none;
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      position: relative;
      padding: 160px 0 120px;
      overflow: hidden;
    }
    #hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: repeating-linear-gradient(45deg, rgba(255,70,85,0.08) 0px, rgba(255,70,85,0.08) 2px, transparent 2px, transparent 12px);
      pointer-events: none;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: clamp(3rem, 6vw, 4.5rem);
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.02em;
      color: white;
      margin-bottom: 1.5rem;
    }
    .hero-text p {
      font-size: 1.25rem;
      color: var(--text-light);
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: flex-end;
    }
    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.5);
      max-height: 360px;
      object-fit: cover;
      width: 100%;
    }

    section {
      padding: 120px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-title h2 {
      font-size: 2.25rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--primary);
      margin-bottom: 0.5rem;
    }
    .section-title p {
      color: var(--text-body);
      max-width: 600px;
      margin: 0 auto;
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border-left: 3px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-left: 3px solid var(--accent);
    }
    .service-card i {
      font-size: 2rem;
      color: var(--accent);
      margin-bottom: 1.5rem;
      display: inline-block;
    }
    .service-card h3 {
      font-weight: 600;
      font-size: 1.25rem;
      color: var(--primary);
      margin-bottom: 0.75rem;
    }

    /* 优势数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-item {
      background: white;
      padding: 2rem 1rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-body);
      font-weight: 500;
      margin-top: 0.5rem;
    }

    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 1.5rem;
    }
    .case-tag {
      background: var(--accent);
      color: white;
      font-size: 0.75rem;
      padding: 0.2rem 0.8rem;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 0.75rem;
    }
    .case-info h3 {
      font-weight: 600;
      font-size: 1.25rem;
      color: var(--primary);
      margin-bottom: 0.5rem;
    }

    /* 流程步骤 */
    .steps-row {
      display: flex;
      justify-content: space-between;
      text-align: center;
      gap: 1rem;
    }
    .step {
      flex: 1;
      background: white;
      padding: 2rem 1rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .step-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 0.5rem;
    }
    .step h3 {
      font-weight: 600;
      color: var(--primary);
    }

    /* FAQ */
    .faq-section {
      background: var(--bg-light);
    }
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 1rem;
      box-shadow: var(--shadow-sm);
      border-left: 3px solid var(--accent);
    }
    .accordion-title {
      font-weight: 600;
      color: var(--primary);
      padding: 1.2rem 1.5rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-body);
      display: none;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }

    /* CTA */
    .cta-strip {
      background: linear-gradient(135deg, #FF4655, #FF6B77);
      padding: 100px 0;
      text-align: center;
    }
    .cta-strip h2 {
      color: white;
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .cta-form {
      display: flex;
      gap: 1rem;
      max-width: 700px;
      margin: 2rem auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-form input {
      flex: 1;
      padding: 0.9rem 1.2rem;
      border-radius: var(--radius-btn);
      border: none;
      outline: none;
    }

    footer {
      background: var(--primary);
      color: var(--text-muted);
      padding: 3rem 0 2rem;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .footer-logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: white;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 2rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .card-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-box { display: none; }
      .hamburger { display: block; }
      .hero-content { flex-direction: column; }
      .card-grid, .case-grid, .stats-grid { grid-template-columns: 1fr; }
      .steps-row { flex-direction: column; }
      section { padding: 80px 0; }
    }