/* roulang page: index */
:root {
      --primary: #1A2A3A;
      --primary-light: #2D4A5A;
      --accent: #E94E1B;
      --accent-light: #F27A3D;
      --bg: #F8F9FA;
      --bg-alt: #EEF1F3;
      --white: #FFFFFF;
      --text: #1A2A3A;
      --text-body: #4A5568;
      --text-muted: #718096;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(26,42,58,0.06);
      --shadow-hover: 0 12px 32px rgba(26,42,58,0.12);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-sm: 12px;
      --transition: 0.3s ease;
      --container-max: 1200px;
      --section-gap: 100px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .font-heading {
      font-family: 'Poppins', 'Inter', sans-serif;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text);
    }
    h1 { font-size: 3rem; letter-spacing: -0.5px; }
    h2 { font-size: 2.4rem; margin-bottom: 1rem; }
    h3 { font-size: 1.8rem; }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    section {
      padding: var(--section-gap) 0;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-size: 1rem;
      gap: 8px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
      color: white;
      box-shadow: 0 8px 18px rgba(233,78,27,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(233,78,27,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(26,42,58,0.08);
      border-color: var(--primary-light);
    }
    .btn-white {
      background: white;
      color: var(--accent);
      font-weight: 700;
    }
    .btn-white:hover {
      background: #f0f0f0;
      transform: scale(1.02);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      z-index: 999;
      border-bottom: 1px solid var(--border-light);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-family: 'Poppins', sans-serif;
      font-weight: 800;
      font-size: 26px;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text-body);
    }
    .nav-links a {
      position: relative;
      padding: 8px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 8px;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }

    /* 首屏 */
    .hero {
      background: linear-gradient(135deg, #1A2A3A 0%, #2D4A5A 100%);
      position: relative;
      overflow: hidden;
      padding: 140px 0 100px;
      color: white;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.04) 0%, transparent 30%);
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      font-size: 3.4rem;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-content .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
      max-width: 600px;
    }
    .hero-badges {
      display: flex;
      gap: 24px;
      margin-bottom: 2.5rem;
    }
    .badge-item {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(10px);
      padding: 12px 20px;
      border-radius: 40px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
      color: white;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      width: 100%;
      max-width: 520px;
      border-radius: 28px;
      box-shadow: 0 24px 48px rgba(0,0,0,0.3);
      transform: rotate(2deg);
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    /* 价值主张 */
    .value-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .value-card {
      background: var(--white);
      padding: 32px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .value-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .value-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 18px;
    }
    .value-card h3 {
      font-size: 1.4rem;
      margin-bottom: 10px;
    }

    /* 功能分组 */
    .capability-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .capability-row.reverse {
      flex-direction: row-reverse;
    }
    .capability-text {
      flex: 1;
    }
    .capability-text h3 {
      margin-bottom: 1rem;
    }
    .feature-list {
      list-style: none;
      margin-top: 20px;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
      font-weight: 500;
    }
    .feature-list i {
      color: var(--accent);
      font-size: 1.2rem;
    }
    .capability-img {
      flex: 1;
    }
    .capability-img img {
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
      object-fit: cover;
      width: 100%;
      height: auto;
      aspect-ratio: 4/3;
    }

    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .scenario-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-img {
      height: 200px;
      background: #eef1f3;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .scenario-content {
      padding: 24px;
    }
    .scenario-content h4 {
      font-size: 1.4rem;
      margin-bottom: 8px;
    }

    /* 成功案例 */
    .stats {
      display: flex;
      justify-content: center;
      gap: 60px;
      margin-bottom: 60px;
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent);
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .case-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      border-left: 6px solid var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .case-quote {
      font-style: italic;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
      transition: var(--transition);
    }
    .pricing-card.featured {
      border: 2px solid var(--accent);
      transform: scale(1.02);
    }
    .pricing-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .badge-popular {
      background: linear-gradient(135deg, var(--accent), var(--accent-light));
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-item:hover {
      background: #f4f6f8;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      margin-top: 16px;
      color: var(--text-body);
      display: none;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1A2A3A 0%, #2D4A5A 100%);
      border-radius: 32px;
      padding: 70px 40px;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .value-grid { grid-template-columns: repeat(2, 1fr); }
      .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 2.4rem; }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .capability-row, .capability-row.reverse { flex-direction: column; }
      .scenario-grid, .case-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .stats { gap: 30px; }
    }