:root {
      --primary-yellow: #f8c200;
      --primary-light: #fff9e6;
      --primary-dark: #cc9f00;
      --accent-black: #11141a;
      --text-main: #1f242d;
      --text-muted: #596273;
      --border-color: #ede2c2;
      --card-bg: #ffffff;
      --page-bg: #faf8f2;
      --transition: all 0.28s ease;
      --shadow-sm: 0 4px 14px rgba(248, 194, 0, 0.08);
      --shadow-md: 0 10px 28px rgba(17, 20, 26, 0.07);
      --shadow-hover: 0 14px 36px rgba(248, 194, 0, 0.25);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--page-bg);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    ul, ol {
      list-style: none;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .header-wrap {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--primary-yellow);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--accent-black);
      letter-spacing: -0.5px;
    }
    .brand-name span {
      background: var(--primary-yellow);
      padding: 2px 6px;
      border-radius: 4px;
      margin-left: 4px;
      font-size: 0.8rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: 6px;
      display: block;
    }
    .nav-links li a:hover {
      background-color: var(--primary-yellow);
      color: var(--accent-black);
    }
    .header-action {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      background: var(--primary-yellow);
      color: var(--accent-black);
      font-weight: 700;
      font-size: 0.9rem;
      border-radius: 8px;
      border: 1px solid var(--primary-dark);
      box-shadow: 0 3px 0 var(--primary-dark);
      cursor: pointer;
    }
    .btn-portal:hover {
      transform: translateY(-1px);
      box-shadow: 0 4px 0 var(--primary-dark);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .hero-section {
      background: linear-gradient(180deg, #fffcf0 0%, #faf6e8 100%);
      padding: 70px 0 50px 0;
      border-bottom: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      background: #fff;
      border: 1px solid var(--primary-yellow);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--accent-black);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-badge::before {
      content: "★";
      color: var(--primary-dark);
      margin-right: 6px;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--accent-black);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title mark {
      background-color: var(--primary-yellow);
      padding: 0 8px;
      border-radius: 6px;
      color: var(--accent-black);
    }
    .hero-desc {
      max-width: 780px;
      margin: 0 auto 36px auto;
      font-size: 1.12rem;
      color: var(--text-muted);
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }
    .btn-main-hero {
      background-color: var(--primary-yellow);
      color: var(--accent-black);
      font-size: 1.15rem;
      font-weight: 800;
      padding: 14px 34px;
      border-radius: 10px;
      border: 2px solid var(--accent-black);
      box-shadow: 4px 4px 0 var(--accent-black);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-main-hero:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0 var(--accent-black);
    }
    .btn-sub-hero {
      background-color: #ffffff;
      color: var(--accent-black);
      font-size: 1.05rem;
      font-weight: 700;
      padding: 14px 28px;
      border-radius: 10px;
      border: 2px solid var(--border-color);
    }
    .btn-sub-hero:hover {
      border-color: var(--accent-black);
    }
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      text-align: left;
    }
    .metric-card {
      background: #ffffff;
      padding: 22px 20px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .metric-val {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--accent-black);
      margin-bottom: 4px;
    }
    .metric-val span {
      color: var(--primary-dark);
      font-size: 1.1rem;
    }
    .metric-lbl {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .section-wrap {
      padding: 65px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .section-head {
      text-align: center;
      margin-bottom: 42px;
    }
    .section-tag {
      font-size: 0.82rem;
      font-weight: 800;
      text-transform: uppercase;
      background: var(--primary-yellow);
      padding: 4px 10px;
      border-radius: 4px;
      color: var(--accent-black);
      display: inline-block;
      margin-bottom: 10px;
    }
    .section-head h2 {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-black);
      margin-bottom: 12px;
    }
    .section-head p {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 650px;
      margin: 0 auto;
    }
    .models-cloud-box {
      background: #ffffff;
      padding: 30px;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .models-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }
    .model-chip {
      background: var(--page-bg);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 8px;
      font-size: 0.86rem;
      font-weight: 600;
      color: var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .model-chip::before {
      content: "";
      width: 6px;
      height: 6px;
      background: var(--primary-yellow);
      border-radius: 50%;
    }
    .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: 28px;
    }
    .feature-card {
      background: #ffffff;
      padding: 26px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-yellow);
    }
    .card-icon-title {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }
    .card-badge-num {
      width: 32px;
      height: 32px;
      background: var(--primary-yellow);
      color: var(--accent-black);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
    }
    .feature-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--accent-black);
    }
    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .card-foot-tag {
      margin-top: 14px;
      padding-top: 10px;
      border-top: 1px dashed var(--border-color);
      font-size: 0.8rem;
      color: var(--primary-dark);
      font-weight: 700;
    }
    .media-card {
      background: #ffffff;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .media-card-img {
      width: 100%;
      height: 200px;
      background-color: #f1ede1;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .media-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .media-card-body {
      padding: 20px;
    }
    .media-card-body h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .media-card-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .eval-highlight-box {
      background: linear-gradient(135deg, #fff9e6 0%, #ffffff 100%);
      border: 2px solid var(--primary-yellow);
      border-radius: 16px;
      padding: 32px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-md);
    }
    .eval-score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--accent-black);
      line-height: 1;
    }
    .eval-score-num small {
      font-size: 1.2rem;
      color: var(--text-muted);
      font-weight: normal;
    }
    .eval-stars {
      color: #ff9800;
      font-size: 1.4rem;
      margin-top: 6px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #fff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .custom-table th {
      background: #faf6ea;
      padding: 16px 20px;
      font-weight: 700;
      color: var(--accent-black);
      border-bottom: 2px solid var(--border-color);
    }
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f2ecdd;
      font-size: 0.92rem;
    }
    .custom-table tr:hover td {
      background: #fffdf5;
    }
    .badge-check {
      background: var(--primary-yellow);
      color: var(--accent-black);
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 0.8rem;
    }
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .step-item {
      background: #fff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary-yellow);
      line-height: 1;
      margin-bottom: 12px;
    }
    .step-item h3 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .review-card {
      background: #fff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .reviewer-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
    }
    .reviewer-meta h3 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--accent-black);
    }
    .reviewer-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .review-stars {
      color: #ff9800;
      font-size: 0.9rem;
    }
    .review-text {
      font-size: 0.9rem;
      color: var(--text-main);
      line-height: 1.6;
    }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.02rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question:hover {
      background-color: #fffdf5;
    }
    .faq-answer {
      padding: 0 24px 18px 24px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question {
      border-bottom: 1px dashed var(--border-color);
      color: var(--primary-dark);
    }
    .faq-toggle-icon {
      font-size: 1.2rem;
      font-weight: bold;
      transition: transform 0.2s;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }
    .form-wrapper {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: 16px;
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group.full {
      grid-column: span 2;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--accent-black);
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.92rem;
      background: #fcfbf7;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary-yellow);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(248, 194, 0, 0.2);
    }
    .btn-submit-form {
      width: 100%;
      background: var(--primary-yellow);
      border: 2px solid var(--accent-black);
      box-shadow: 3px 3px 0 var(--accent-black);
      padding: 14px;
      font-size: 1.05rem;
      font-weight: 800;
      border-radius: 8px;
      cursor: pointer;
      color: var(--accent-black);
      margin-top: 10px;
    }
    .btn-submit-form:hover {
      transform: translate(-1px, -1px);
      box-shadow: 4px 4px 0 var(--accent-black);
    }
    .banner-row-box {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .banner-slot {
      border-radius: 10px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #fff;
    }
    .banner-slot img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .footer-wrap {
      background-color: #ffffff;
      border-top: 3px solid var(--primary-yellow);
      padding: 55px 0 25px 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h3 {
      font-size: 1.08rem;
      font-weight: 800;
      margin-bottom: 18px;
      color: var(--accent-black);
    }
    .footer-col p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 12px;
      line-height: 1.6;
    }
    .footer-col ul li {
      margin-bottom: 10px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .footer-col ul li a:hover {
      color: var(--primary-dark);
      text-decoration: underline;
    }
    .qr-contact-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .qr-container {
      width: 90px;
      height: 90px;
      border: 1px solid var(--border-color);
      padding: 4px;
      background: #fff;
      border-radius: 6px;
    }
    .qr-container img {
      width: 100%;
      height: 100%;
      display: block;
    }
    .links-section-box {
      background: #fbf9f2;
      border-radius: 10px;
      padding: 16px 20px;
      margin-bottom: 30px;
      border: 1px solid var(--border-color);
    }
    .links-title {
      font-size: 0.88rem;
      font-weight: 800;
      color: var(--accent-black);
      margin-bottom: 8px;
    }
    .links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .links-flex a {
      color: var(--text-muted);
    }
    .links-flex a:hover {
      color: var(--accent-black);
      text-decoration: underline;
    }
    .footer-bottom {
      text-align: center;
      font-size: 0.84rem;
      color: var(--text-muted);
      padding-top: 20px;
      border-top: 1px solid #ede5cf;
    }
    .side-floating-bar {
      position: fixed;
      right: 18px;
      bottom: 75px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }
    .floating-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 2px solid var(--primary-yellow);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      font-size: 1.1rem;
      color: var(--accent-black);
      font-weight: bold;
      position: relative;
    }
    .floating-btn:hover {
      background: var(--primary-yellow);
    }
    .floating-qr-pop {
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #fff;
      padding: 8px;
      border: 2px solid var(--primary-yellow);
      border-radius: 8px;
      box-shadow: var(--shadow-md);
      display: none;
      width: 140px;
      text-align: center;
    }
    .floating-qr-pop img {
      width: 100%;
      height: auto;
      display: block;
    }
    .floating-qr-pop span {
      font-size: 0.78rem;
      color: var(--text-main);
      margin-top: 4px;
      display: block;
      font-weight: 600;
    }
    .floating-btn.kefu-btn:hover .floating-qr-pop {
      display: block;
    }
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2rem;
      }
      .grid-4, .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .banner-row-box {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 2px solid var(--primary-yellow);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .hero-title {
        font-size: 1.65rem;
      }
      .grid-2, .grid-3, .grid-4, .hero-metrics-grid, .flow-steps, .banner-row-box {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-highlight-box {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
    }