* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    :root {
      --orange: #f25c1f;
      --orange-deep: #d9480f;
      --orange-light: #fff1e8;
      --orange-glow: rgba(242, 92, 31, 0.16);
      --bg: #fefcf9;
      --bg-soft: #fff7f2;
      --text: #2b2420;
      --text-light: #6b5f56;
      --border: #f0e4dc;
      --card-bg: #ffffff;
      --shadow-sm: 0 2px 8px rgba(43, 36, 32, 0.04);
      --shadow-md: 0 8px 28px rgba(242, 92, 31, 0.10);
      --radius: 18px;
      --radius-sm: 12px;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 252, 249, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      min-height: 68px;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .brand img {
      height: 40px;
      width: auto;
      border-radius: 8px;
    }
    .brand-name {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--orange-deep);
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-light);
      border-radius: 10px;
      transition: color 0.2s, background 0.2s;
    }
    .nav-links a:hover {
      color: var(--orange-deep);
      background: var(--orange-light);
    }
    .nav-cta {
      flex-shrink: 0;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 10px 22px;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: 999px;
      border: none;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--orange);
      color: #fff;
      box-shadow: 0 4px 14px var(--orange-glow);
    }
    .btn-primary:hover {
      background: var(--orange-deep);
      transform: translateY(-2px);
      box-shadow: 0 8px 22px var(--orange-glow);
    }
    .btn-outline {
      background: #fff;
      color: var(--orange-deep);
      border: 1.5px solid var(--orange);
    }
    .btn-outline:hover {
      background: var(--orange-light);
      transform: translateY(-2px);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2.5px;
      background: var(--text);
      margin: 5px 0;
      border-radius: 2px;
      transition: 0.25s;
    }
    /* hero */
    .hero {
      padding: 64px 0 56px;
      background: radial-gradient(circle at 80% 10%, #ffe6d8 0%, transparent 55%),
                  radial-gradient(circle at 10% 80%, #fff0e6 0%, transparent 50%),
                  var(--bg-soft);
      position: relative;
      overflow: hidden;
    }
    .hero-inner {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: var(--orange-light);
      color: var(--orange-deep);
      font-size: 0.8rem;
      font-weight: 600;
      border-radius: 999px;
      margin-bottom: 18px;
      letter-spacing: 0.5px;
      border: 1px solid #fbd5c0;
    }
    .hero h1 {
      font-size: 2.6rem;
      line-height: 1.2;
      font-weight: 800;
      color: var(--text);
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }
    .hero h1 span {
      color: var(--orange);
    }
    .hero-desc {
      font-size: 1.05rem;
      color: var(--text-light);
      margin-bottom: 28px;
      max-width: 560px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 24px;
    }
    .hero-metrics {
      display: flex;
      flex-wrap: wrap;
      gap: 28px;
      margin-top: 8px;
    }
    .metric-item {
      display: flex;
      flex-direction: column;
    }
    .metric-num {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--orange-deep);
    }
    .metric-label {
      font-size: 0.82rem;
      color: var(--text-light);
    }
    .hero-panel {
      background: #fff;
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .hero-panel:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 40px var(--orange-glow);
    }
    .hero-panel-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .hero-panel-title::before {
      content: "";
      width: 8px;
      height: 8px;
      background: var(--orange);
      border-radius: 50%;
    }
    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .hero-tags span {
      background: var(--bg-soft);
      color: var(--text-light);
      font-size: 0.8rem;
      padding: 5px 12px;
      border-radius: 8px;
      border: 1px solid var(--border);
      transition: 0.2s;
    }
    .hero-tags span:hover {
      background: var(--orange-light);
      color: var(--orange-deep);
      border-color: #fbd5c0;
    }
    /* section common */
    section {
      padding: 68px 0;
    }
    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 44px;
    }
    .section-label {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--orange-deep);
      letter-spacing: 2px;
      text-transform: uppercase;
      margin-bottom: 10px;
    }
    .section-head h2 {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text);
      margin-bottom: 12px;
      line-height: 1.3;
    }
    .section-head p {
      color: var(--text-light);
      font-size: 0.98rem;
    }
    /* cards grid */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius);
      border: 1px solid var(--border);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #fbd5c0;
    }
    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: var(--orange-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 16px;
    }
    .card h3 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
    }
    .card p {
      font-size: 0.88rem;
      color: var(--text-light);
      line-height: 1.7;
    }
    /* platform intro */
    .intro-wrap {
      background: var(--bg-soft);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .intro-text h2 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text);
      line-height: 1.3;
    }
    .intro-text p {
      color: var(--text-light);
      margin-bottom: 16px;
      font-size: 0.95rem;
    }
    .intro-list {
      list-style: none;
      display: grid;
      gap: 10px;
    }
    .intro-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      font-size: 0.9rem;
      color: var(--text);
    }
    .intro-list li::before {
      content: "✓";
      color: var(--orange);
      font-weight: 800;
      flex-shrink: 0;
    }
    .intro-stats {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .intro-stat {
      background: #fff;
      border-radius: var(--radius-sm);
      padding: 20px;
      text-align: center;
      border: 1px solid var(--border);
      transition: transform 0.2s;
    }
    .intro-stat:hover {
      transform: translateY(-3px);
    }
    .intro-stat strong {
      display: block;
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--orange-deep);
    }
    .intro-stat span {
      font-size: 0.8rem;
      color: var(--text-light);
    }
    /* scenario chips */
    .chip-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .chip {
      background: #fff;
      border: 1px solid var(--border);
      padding: 10px 18px;
      border-radius: 999px;
      font-size: 0.88rem;
      color: var(--text);
      font-weight: 500;
      transition: 0.2s;
      cursor: default;
    }
    .chip:hover {
      background: var(--orange-light);
      border-color: var(--orange);
      color: var(--orange-deep);
      transform: translateY(-2px);
    }
    /* timeline */
    .timeline {
      display: grid;
      gap: 0;
      position: relative;
      max-width: 820px;
      margin: 0 auto;
    }
    .timeline-item {
      display: grid;
      grid-template-columns: 88px 1fr;
      gap: 24px;
      padding: 22px 0;
      border-bottom: 1px dashed var(--border);
    }
    .timeline-item:last-child {
      border-bottom: none;
    }
    .timeline-step {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--orange);
      opacity: 0.85;
    }
    .timeline-content h3 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .timeline-content p {
      font-size: 0.88rem;
      color: var(--text-light);
    }
    /* comparison table */
    .table-wrap {
      overflow-x: auto;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      background: #fff;
      box-shadow: var(--shadow-sm);
    }
    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 720px;
    }
    th, td {
      padding: 16px 20px;
      text-align: left;
      font-size: 0.9rem;
      border-bottom: 1px solid var(--border);
    }
    th {
      background: var(--orange-light);
      color: var(--orange-deep);
      font-weight: 700;
      font-size: 0.85rem;
      white-space: nowrap;
    }
    tr:last-child td {
      border-bottom: none;
    }
    td:first-child {
      font-weight: 600;
      color: var(--text);
    }
    .rating-highlight {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--orange-deep);
      font-weight: 800;
    }
    .stars {
      color: var(--orange);
      letter-spacing: 2px;
    }
    /* review cards */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }
    .review-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .review-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .review-head {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--orange-light);
      color: var(--orange-deep);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
      flex-shrink: 0;
    }
    .review-name {
      font-weight: 700;
      font-size: 0.92rem;
    }
    .review-role {
      font-size: 0.76rem;
      color: var(--text-light);
    }
    .review-text {
      font-size: 0.86rem;
      color: var(--text-light);
      line-height: 1.7;
    }
    /* case showcase */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #fff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      aspect-ratio: 16 / 9;
      background: var(--bg-soft);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-body {
      padding: 20px 22px;
    }
    .case-body h3 {
      font-size: 1.02rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .case-body p {
      font-size: 0.85rem;
      color: var(--text-light);
    }
    /* form */
    .form-section {
      background: var(--orange-light);
      border-radius: var(--radius);
      padding: 40px;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full {
      grid-column: 1 / -1;
    }
    .form-group label {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text);
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      padding: 12px 14px;
      border: 1px solid #f0d5c6;
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--text);
      background: #fff;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
      font-family: inherit;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--orange);
      box-shadow: 0 0 0 3px var(--orange-glow);
    }
    .form-group textarea {
      min-height: 100px;
      resize: vertical;
    }
    .form-submit {
      margin-top: 8px;
      justify-self: start;
    }
    /* faq */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: grid;
      gap: 14px;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item.active {
      border-color: var(--orange);
    }
    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 22px;
      background: none;
      border: none;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text);
      cursor: pointer;
      text-align: left;
      font-family: inherit;
    }
    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      color: var(--orange);
      transition: transform 0.25s;
      flex-shrink: 0;
      line-height: 1;
    }
    .faq-item.active .faq-question::after {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 22px;
      font-size: 0.88rem;
      color: var(--text-light);
      line-height: 1.75;
    }
    .faq-item.active .faq-answer {
      max-height: 260px;
      padding-bottom: 18px;
    }
    /* articles */
    .article-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      padding: 18px 22px;
      transition: 0.2s;
    }
    .article-item:hover {
      border-color: var(--orange);
      background: var(--orange-light);
      transform: translateX(4px);
    }
    .article-item span {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text);
    }
    .article-item em {
      font-style: normal;
      font-size: 0.8rem;
      color: var(--orange-deep);
      white-space: nowrap;
    }
    /* footer */
    .site-footer {
      background: #2b2420;
      color: #e8ddd5;
      padding: 48px 0 24px;
      margin-top: 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
      gap: 32px;
      margin-bottom: 36px;
    }
    .footer-brand img {
      height: 36px;
      width: auto;
      margin-bottom: 12px;
      border-radius: 6px;
    }
    .footer-brand p {
      font-size: 0.85rem;
      color: #b8a99e;
      line-height: 1.7;
      margin-bottom: 10px;
    }
    .footer-col h4 {
      font-size: 0.9rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .footer-col ul {
      list-style: none;
      display: grid;
      gap: 9px;
    }
    .footer-col a {
      font-size: 0.83rem;
      color: #b8a99e;
      transition: color 0.2s;
    }
    .footer-col a:hover {
      color: var(--orange);
    }
    .footer-contact p {
      font-size: 0.83rem;
      color: #b8a99e;
      margin-bottom: 6px;
    }
    .footer-contact a {
      color: var(--orange);
    }
    .footer-bottom {
      border-top: 1px solid #423a34;
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      font-size: 0.78rem;
      color: #8f8177;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links a {
      color: #b8a99e;
      font-size: 0.78rem;
      transition: color 0.2s;
    }
    .friend-links a:hover {
      color: var(--orange);
    }
    /* floating */
    .float-service {
      position: fixed;
      right: 22px;
      bottom: 100px;
      z-index: 90;
    }
    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--orange);
      color: #fff;
      border: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      box-shadow: 0 6px 20px rgba(242, 92, 31, 0.35);
      transition: transform 0.2s, background 0.2s;
    }
    .float-btn:hover {
      background: var(--orange-deep);
      transform: scale(1.06);
    }
    .float-qr {
      display: none;
      position: absolute;
      right: 0;
      bottom: 64px;
      background: #fff;
      border-radius: 14px;
      padding: 12px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
      border: 1px solid var(--border);
      width: 170px;
    }
    .float-qr.show {
      display: block;
    }
    .float-qr img {
      width: 100%;
      border-radius: 8px;
    }
    .float-qr p {
      text-align: center;
      font-size: 0.74rem;
      color: var(--text-light);
      margin-top: 6px;
    }
    .back-top {
      position: fixed;
      right: 22px;
      bottom: 36px;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #fff;
      border: 1px solid var(--border);
      color: var(--orange-deep);
      font-size: 1.1rem;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
      display: none;
      align-items: center;
      justify-content: center;
      transition: 0.2s;
      z-index: 90;
    }
    .back-top.show {
      display: flex;
    }
    .back-top:hover {
      background: var(--orange-light);
      transform: translateY(-3px);
    }
    /* reveal animation */
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .reveal.visible {
      opacity: 1;
      transform: none;
    }
    /* responsive */
    @media (max-width: 1024px) {
      .hero-inner {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .intro-wrap {
        grid-template-columns: 1fr;
        padding: 30px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 820px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        padding: 12px 20px 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
      }
      .nav-links.open {
        display: flex;
      }
      .nav-links a {
        padding: 12px 8px;
        border-radius: 8px;
      }
      .menu-toggle {
        display: block;
      }
      .nav-cta .btn {
        padding: 8px 16px;
        font-size: 0.85rem;
      }
      .hero h1 {
        font-size: 2rem;
      }
      .section-head h2 {
        font-size: 1.6rem;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .article-list {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
      section {
        padding: 48px 0;
      }
      .grid-3,
      .grid-2,
      .review-grid {
        grid-template-columns: 1fr;
      }
      .hero-metrics {
        gap: 18px;
      }
      .hero-actions {
        flex-direction: column;
        align-items: stretch;
      }
      .hero-actions .btn {
        width: 100%;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-section {
        padding: 24px;
      }
      .timeline-item {
        grid-template-columns: 60px 1fr;
        gap: 14px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
      .intro-stats {
        grid-template-columns: 1fr 1fr;
      }
    }