:root {
      --primary: #FFB703;
      --primary-bright: #FFD000;
      --primary-dark: #FB8500;
      --accent-yellow: #FFF3B0;
      --bg-light: #FAFAF8;
      --bg-card: #FFFFFF;
      --text-main: #111827;
      --text-muted: #4B5563;
      --text-soft: #6B7280;
      --border-color: #E5E7EB;
      --border-highlight: #FDE047;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(251, 133, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 20px 30px -10px rgba(245, 158, 11, 0.15);
      --radius-base: 12px;
      --max-width: 1240px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
    }
    body {
      background-color: var(--bg-light);
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--primary-bright);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.35rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }
    .brand-badge {
      display: inline-block;
      background: var(--primary-bright);
      color: var(--text-main);
      font-size: 0.72rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 999px;
      border: 1px solid #EAB308;
    }
    .nav-links {
      display: flex;
      gap: 0;
      list-style: none;
      align-items: center;
    }
    .nav-item-link {
      padding: 10px 14px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: 6px;
      transition: all 0.2s ease;
      white-space: nowrap;
    }
    .nav-item-link:hover {
      background: var(--accent-yellow);
      color: #000000;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 18px;
      background: var(--primary-bright);
      color: #000;
      font-weight: 700;
      font-size: 0.9rem;
      border-radius: 8px;
      border: 1px solid #CA8A04;
      box-shadow: 0 2px 6px rgba(250, 204, 21, 0.4);
    }
    .btn-nav-primary:hover {
      background: #FFB703;
      transform: translateY(-1px);
    }
    .nav-toggle-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      padding: 6px;
    }

    /* Hero Section (Strictly No Images) */
    .hero-section {
      background: linear-gradient(135deg, #FFFBEB 0%, #FEF08A 45%, #FDE047 100%);
      padding: 80px 0 70px;
      position: relative;
      border-bottom: 1px solid rgba(234, 179, 8, 0.4);
    }
    .hero-wrapper {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.55rem;
      font-weight: 900;
      line-height: 1.25;
      color: #111827;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-content h1 span {
      background: #111827;
      color: #FACC15;
      padding: 2px 10px;
      border-radius: 6px;
      display: inline-block;
    }
    .hero-lead {
      font-size: 1.12rem;
      color: #374151;
      margin-bottom: 30px;
      line-height: 1.7;
      font-weight: 500;
    }
    .hero-actions-row {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 36px;
    }
    .btn-hero-main {
      padding: 14px 32px;
      background: #111827;
      color: #FACC15;
      font-weight: 800;
      font-size: 1.08rem;
      border-radius: 10px;
      box-shadow: 0 10px 20px rgba(17, 24, 39, 0.2);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-hero-main:hover {
      background: #000;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(17, 24, 39, 0.3);
    }
    .btn-hero-secondary {
      padding: 14px 26px;
      background: #FFFFFF;
      color: #111827;
      font-weight: 700;
      font-size: 1rem;
      border-radius: 10px;
      border: 2px solid #111827;
    }
    .btn-hero-secondary:hover {
      background: #F3F4F6;
      transform: translateY(-2px);
    }
    .hero-card-panel {
      background: #FFFFFF;
      border-radius: 16px;
      padding: 30px;
      border: 3px solid #111827;
      box-shadow: 8px 8px 0px #111827;
    }
    .panel-header-badge {
      display: inline-block;
      background: #FEF08A;
      border: 1px solid #CA8A04;
      padding: 4px 12px;
      border-radius: 6px;
      font-size: 0.8rem;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .panel-metrics-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 16px;
    }
    .metric-box {
      background: #FAFAF8;
      border: 1px solid #E5E7EB;
      border-radius: 10px;
      padding: 16px;
      text-align: center;
      transition: all 0.2s ease;
    }
    .metric-box:hover {
      background: #FEF9C3;
      border-color: #EAB308;
    }
    .metric-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: #111827;
      line-height: 1.1;
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 0.82rem;
      font-weight: 600;
      color: #4B5563;
    }

    /* Common Section Styles */
    section {
      padding: 70px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      margin-bottom: 50px;
    }
    .section-eyebrow {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      background: #FEF08A;
      color: #854D0E;
      padding: 4px 14px;
      border-radius: 999px;
      border: 1px solid #FACC15;
      margin-bottom: 10px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
    }

    /* Cards Grid */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
      overflow: hidden;
    }
    .feature-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--primary-bright);
      opacity: 0;
      transition: opacity 0.25s;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-highlight);
    }
    .feature-card:hover::before {
      opacity: 1;
    }
    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: var(--accent-yellow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      color: #854D0E;
      margin-bottom: 16px;
      font-size: 1.2rem;
    }
    .card-title {
      font-size: 1.18rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .card-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: #92400E;
      background: #FEF3C7;
      display: inline-block;
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
    }

    /* Model Cloud */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }
    .model-pill {
      background: #FFFFFF;
      border: 1px solid #E5E7EB;
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      transition: all 0.2s;
    }
    .model-pill:hover {
      background: var(--primary-bright);
      border-color: #CA8A04;
      transform: scale(1.05);
    }

    /* Comparison Table */
    .table-container {
      background: #FFFFFF;
      border-radius: 16px;
      border: 2px solid #111827;
      overflow-x: auto;
      box-shadow: 6px 6px 0px #111827;
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #E5E7EB;
    }
    .custom-table th {
      background: #FEF08A;
      color: #111827;
      font-weight: 800;
      font-size: 0.95rem;
    }
    .custom-table tr:hover {
      background: #FFFBEB;
    }
    .badge-highlight {
      display: inline-block;
      background: #111827;
      color: #FACC15;
      font-weight: 700;
      font-size: 0.78rem;
      padding: 3px 10px;
      border-radius: 4px;
    }
    .score-banner {
      background: linear-gradient(135deg, #111827 0%, #1F2937 100%);
      color: #FFFFFF;
      padding: 24px;
      border-radius: 12px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 24px;
      border: 2px solid var(--primary-bright);
    }
    .score-rating {
      font-size: 2.2rem;
      font-weight: 900;
      color: #FACC15;
    }

    /* Image Gallery & Media */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 30px;
    }
    .media-item {
      background: #FFFFFF;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid #E5E7EB;
      box-shadow: var(--shadow-sm);
    }
    .media-thumb-box {
      width: 100%;
      height: 220px;
      overflow: hidden;
      background: #F3F4F6;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .media-thumb-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }
    .media-thumb-box img:hover {
      transform: scale(1.04);
    }
    .media-content {
      padding: 16px;
    }
    .media-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: #111827;
    }
    .media-desc {
      font-size: 0.85rem;
      color: #6B7280;
    }

    /* Steps Process */
    .steps-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #FFFFFF;
      border: 1px solid #E5E7EB;
      border-radius: 12px;
      padding: 22px;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: #111827;
      color: #FDE047;
      font-weight: 900;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
    }

    /* Testimonials */
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid #E5E7EB;
      border-radius: 12px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-quote {
      font-size: 0.94rem;
      color: #374151;
      line-height: 1.65;
      margin-bottom: 16px;
      font-style: normal;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed #E5E7EB;
      padding-top: 14px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      background: #FEF08A;
      color: #854D0E;
      border-radius: 50%;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 2px solid #EAB308;
    }
    .author-info h4 {
      font-size: 0.92rem;
      font-weight: 700;
      color: #111827;
    }
    .author-info p {
      font-size: 0.78rem;
      color: #6B7280;
    }

    /* FAQ Accordion */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid #E5E7EB;
      border-radius: 10px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item:hover {
      border-color: #FACC15;
    }
    .faq-question {
      padding: 18px 22px;
      font-size: 1.02rem;
      font-weight: 700;
      color: #111827;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      background: #FFFFFF;
    }
    .faq-icon {
      font-size: 1.3rem;
      font-weight: 400;
      transition: transform 0.25s;
    }
    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      font-size: 0.92rem;
      color: #4B5563;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: #D97706;
    }

    /* Contact & Form */
    .contact-container {
      background: #FFFFFF;
      border-radius: 16px;
      border: 2px solid #111827;
      box-shadow: 8px 8px 0px #111827;
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1.2fr;
    }
    .contact-info-panel {
      background: #FFFBEB;
      padding: 40px 30px;
      border-right: 2px solid #111827;
    }
    .contact-info-panel h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: #111827;
    }
    .info-list-group {
      margin-top: 24px;
      list-style: none;
    }
    .info-list-group li {
      margin-bottom: 14px;
      font-size: 0.92rem;
      color: #374151;
      display: flex;
      align-items: flex-start;
      gap: 8px;
    }
    .info-list-group strong {
      color: #111827;
      min-width: 80px;
    }
    .qr-box {
      margin-top: 24px;
      display: flex;
      align-items: center;
      gap: 16px;
      background: #FFFFFF;
      padding: 16px;
      border-radius: 10px;
      border: 1px solid #FDE047;
    }
    .qr-box img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
      object-fit: cover;
    }
    .form-panel {
      padding: 40px 36px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: #111827;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #D1D5DB;
      border-radius: 8px;
      font-size: 0.95rem;
      background: #FAFAF8;
      transition: all 0.2s;
    }
    .form-control:focus {
      outline: none;
      border-color: #F59E0B;
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
    }
    .btn-submit {
      width: 100%;
      padding: 14px;
      background: #111827;
      color: #FACC15;
      font-size: 1.05rem;
      font-weight: 800;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .btn-submit:hover {
      background: #000000;
      transform: translateY(-2px);
      box-shadow: 0 6px 12px rgba(0,0,0,0.15);
    }

    /* Articles & Links */
    .articles-box {
      background: #FFFFFF;
      border-radius: 12px;
      padding: 24px;
      border: 1px solid #E5E7EB;
      margin-bottom: 24px;
    }
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 12px;
    }
    .article-pill {
      background: #F3F4F6;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      color: #374151;
      font-weight: 600;
      transition: all 0.2s;
    }
    .article-pill:hover {
      background: #FEF08A;
      color: #111827;
    }

    /* Footer */
    .site-footer {
      background: #111827;
      color: #D1D5DB;
      padding: 60px 0 30px;
      border-top: 4px solid #FACC15;
    }
    .footer-top-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
      padding-bottom: 8px;
    }
    .footer-col h4::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 28px;
      height: 3px;
      background: #FACC15;
    }
    .footer-links-list {
      list-style: none;
    }
    .footer-links-list li {
      margin-bottom: 8px;
    }
    .footer-links-list a {
      color: #9CA3AF;
      font-size: 0.88rem;
    }
    .footer-links-list a:hover {
      color: #FACC15;
      padding-left: 4px;
    }
    .friend-links-box {
      border-top: 1px solid #374151;
      padding: 24px 0;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
    }
    .friend-links-box strong {
      color: #F3F4F6;
      font-size: 0.88rem;
    }
    .friend-links-box a {
      color: #9CA3AF;
      font-size: 0.85rem;
      background: #1F2937;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .friend-links-box a:hover {
      background: #FACC15;
      color: #111827;
    }
    .footer-bottom {
      border-top: 1px solid #1F2937;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #6B7280;
    }

    /* Float Service Tool */
    .floating-kefu-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 9999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .kefu-float-btn {
      width: 52px;
      height: 52px;
      background: #FACC15;
      color: #111827;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      border: 2px solid #111827;
      cursor: pointer;
      font-weight: 800;
      font-size: 0.82rem;
      position: relative;
      text-align: center;
      transition: transform 0.2s;
    }
    .kefu-float-btn:hover {
      transform: scale(1.08);
      background: #EAB308;
    }
    .kefu-popup-card {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #FFFFFF;
      border: 2px solid #111827;
      box-shadow: 6px 6px 0px #111827;
      padding: 16px;
      border-radius: 12px;
      width: 190px;
      display: none;
      text-align: center;
    }
    .kefu-float-btn:hover .kefu-popup-card {
      display: block;
    }
    .kefu-popup-card img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px;
    }
    .kefu-popup-card span {
      font-size: 0.78rem;
      font-weight: 700;
      color: #111827;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-wrapper {
        grid-template-columns: 1fr;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .media-card-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 2px solid var(--primary-bright);
        display: none;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-toggle-btn {
        display: block;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .grid-3, .grid-4, .grid-2, .steps-row, .media-card-grid {
        grid-template-columns: 1fr;
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
      .contact-info-panel {
        border-right: none;
        border-bottom: 2px solid #111827;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
    }