/* 原型导航：全宽顶栏与独立 AI 大模型分类面板。 */
.xc-header {
    --ai-primary: #3867dc;
    --ai-muted: #6f7f95;
    --ai-border: #e5ebf3;
    --ai-accent: #eef4ff;
}
@media (min-width: 1025px) {
    .xc-header .head .head-item.container { width: 100%; max-width: none; margin: 0; padding-inline: 24px; }
    .xc-header .head .logo { flex-shrink: 0; }
    .xc-header .head .nav { flex: 1; width: auto; min-width: 0; }
    .xc-header .head .nav > .ml-auto { display: flex; align-items: center; flex-shrink: 0; gap: 30px; margin-left: auto; }
    .xc-header .head .nav > .ml-auto > a { padding-right: 0; }
}
.xc-header .website-ai-trigger { background: transparent; border: 0; font: inherit; color: inherit; cursor: pointer; padding: 0 24px 0 0; white-space: nowrap; flex-shrink: 0; }
.xc-header .website-ai-trigger:hover,
.xc-header .website-ai-trigger[aria-expanded="true"],
.xc-header .website-ai-trigger.is-active { color: var(--ai-primary); }
.xc-header .website-ai-trigger.is-active { font-weight: 700; }
.xc-header .website-ai-backdrop { position: fixed; inset: 68px 0 0; z-index: 100; background: rgba(255, 255, 255, .28); backdrop-filter: blur(7px); }
.xc-header .website-ai-menu { position: fixed; z-index: 101; display: flex; flex-direction: column; box-sizing: border-box; overflow: hidden; border-radius: 16px; background: #fff; outline: 1px solid var(--ai-border); box-shadow: 0 0 20px #e1e8f0; color: #272f37; line-height: 1.5; text-align: left; animation: website-ai-enter 260ms ease both; }
.xc-header .website-ai-menu[hidden],
.xc-header .website-ai-backdrop[hidden] { display: none; }
.xc-header .website-ai-menu-body { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 36px; min-height: 0; overflow: auto; overscroll-behavior: contain; scrollbar-width: none; padding: 26px 26px 48px; }
.xc-header .website-ai-menu-body::-webkit-scrollbar { display: none; }
.xc-header .website-ai-menu svg { width: 18px; height: 18px; flex-shrink: 0; }
.xc-header .website-ai-menu a { text-decoration: none; color: inherit; }
.xc-header .website-ai-menu a:hover strong { color: var(--ai-primary); }
.xc-header .website-ai-menu a:focus-visible,
.xc-header .website-ai-trigger:focus-visible { outline: 2px solid var(--ai-primary); outline-offset: 3px; }
.xc-header .website-ai-intro { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; padding-right: 24px; border-right: 1px solid var(--ai-border); }
.xc-header .website-ai-intro h2 { margin: 0; font-size: 22px; font-weight: 600; }
.xc-header .website-ai-intro > p { margin: 0; color: var(--ai-muted); font-size: 14px; line-height: 1.9; }
.xc-header .website-ai-applications { width: 100%; margin-top: 4px; padding-top: 20px; border-top: 1px solid var(--ai-border); }
.xc-header .website-ai-applications > h3 { margin: 0 0 16px; font-size: 15px; font-weight: 500; }
.xc-header .website-ai-capability-grid { display: grid; gap: 18px; }
.xc-header .website-ai-capability-grid article { display: grid; grid-template-columns: 20px minmax(0, 1fr); gap: 6px 10px; }
.xc-header .website-ai-capability-grid img { display: block; width: 20px; height: 20px; object-fit: contain; }
.xc-header .website-ai-capability-grid h4 { margin: 0; font-size: 13px; font-weight: 500; }
.xc-header .website-ai-capability-grid p { grid-column: 2; margin: 0; font-size: 12px; line-height: 1.7; color: var(--ai-muted); }
.xc-header .website-ai-content { min-width: 0; }
.xc-header .website-ai-shortcuts { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 28px; }
.xc-header .website-ai-shortcuts > a { display: flex; align-items: center; gap: 14px; padding: 18px; background: linear-gradient(120deg, var(--ai-accent), #f5f7fa); border-radius: 6px; }
.xc-header .website-ai-shortcuts > a > svg:first-child { box-sizing: content-box; padding: 10px; background: #fff; border-radius: 8px; color: var(--ai-primary); }
.xc-header .website-ai-shortcuts > a > svg:last-child { margin-left: auto; }
.xc-header .website-ai-shortcuts strong { display: block; font-size: 15px; font-weight: 500; }
.xc-header .website-ai-shortcuts small { display: block; margin-top: 5px; font-size: 12px; color: var(--ai-muted); }
.xc-header .website-ai-section-title { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; margin-bottom: 18px; }
.xc-header .website-ai-section-title .website-ai-view-more { display: inline-flex; align-items: center; gap: 4px; color: var(--ai-primary); font-size: 13px; white-space: nowrap; }
.xc-header .website-ai-view-more:hover { text-decoration: underline; }
.xc-header .website-ai-section-title > p { grid-column: 1 / -1; }
.xc-header .website-ai-section-title h3 { margin: 0; color: var(--ai-primary); font-size: 17px; font-weight: 500; }
.xc-header .website-ai-section-title p { margin: 6px 0 0; color: var(--ai-muted); font-size: 12px; }
.xc-header .website-ai-model-columns { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 20px 32px; }
.xc-header .website-ai-model-columns section { min-width: 0; }
.xc-header .website-ai-model-columns h4 { margin: 0 0 12px; font-size: 15px; font-weight: 600; }
.xc-header .website-ai-language-column { grid-row: span 2; }
.xc-header .website-ai-language-column .website-ai-model-list { grid-template-rows: repeat(4, auto); grid-auto-flow: column; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 28px; }
.xc-header .website-ai-model-columns section:last-child { grid-column: 3; grid-row: 1 / span 2; }
.xc-header .website-ai-model-list { display: grid; align-content: start; gap: 8px; }
.xc-header .website-ai-model-entry { display: block; min-width: 0; padding: 8px; border-radius: 4px; }
.xc-header .website-ai-model-entry:hover { background: #f5f7fa; }
.xc-header .website-ai-model-entry strong { display: flex; align-items: center; gap: 8px; min-width: 0; font-size: 14px; font-weight: 400; }
.xc-header .website-ai-model-name { min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.xc-header .website-ai-model-entry p { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; margin: 6px 0 0; font-size: 12px; color: var(--ai-muted); line-height: 1.7; }
.xc-header .website-ai-status { flex-shrink: 0; padding: 1px 4px; font-size: 10px; font-weight: 600; line-height: 1.5; background: var(--ai-accent); color: var(--ai-primary); }
.xc-header .website-ai-status-hot { color: #d95850; background: #fcf2f1; }
.xc-header .website-ai-industries { margin-top: 30px; }
.xc-header .website-ai-industries h3 { margin: 0 0 20px; font-size: 17px; font-weight: 500; }
.xc-header .website-ai-industries header > p { margin: -10px 0 20px; color: var(--ai-muted); font-size: 13px; }
.xc-header .website-ai-industry-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.xc-header .website-ai-industry-grid article { padding: 24px; border: 1px solid var(--ai-border); border-radius: 12px; background: linear-gradient(145deg, #e7edfb, #fff 85%); }
.xc-header .website-ai-industry-grid article:nth-child(2) { background: linear-gradient(145deg, #e3f4ef, #fff 85%); }
.xc-header .website-ai-industry-grid article:nth-child(3) { background: linear-gradient(145deg, #fdf1e5, #fff 85%); }
.xc-header .website-ai-industry-grid article:nth-child(4) { background: linear-gradient(145deg, #f0eafb, #fff 85%); }
.xc-header .website-ai-industry-grid article > svg { box-sizing: content-box; padding: 10px; background: #fff; border-radius: 8px; color: var(--ai-primary); }
.xc-header .website-ai-industry-grid h4 { margin: 14px 0 10px; font-size: 15px; font-weight: 500; }
.xc-header .website-ai-industry-grid p { margin: 0; font-size: 13px; line-height: 1.9; color: var(--ai-muted); }
.xc-header .website-ai-industry-grid small { display: block; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--ai-border); font-size: 12px; line-height: 1.8; color: var(--ai-muted); }
@media (max-width: 1100px) {
    .xc-header .website-ai-menu-body { grid-template-columns: 160px minmax(0, 1fr); gap: 20px; }
    .xc-header .website-ai-model-columns { grid-template-columns: 1fr 1fr; }
    .xc-header .website-ai-model-columns section:last-child { grid-column: auto; grid-row: auto; }
    .xc-header .website-ai-language-column { grid-column: 1 / -1; grid-row: auto; }
}
@media (max-width: 1024px) {
    .xc-header .website-ai-trigger { min-height: 52px; width: 100%; padding: 14px 0; border-bottom: 1px solid #f0f0f0; text-align: left; font-size: 16px; line-height: 1.5; }
    .xc-header .head .nav > a, .xc-header .head .nav > button { flex-shrink: 0; }
    .xc-header .head .nav .ml-auto .cooperation-btn { flex: 1; width: auto; text-align: center; }
    .xc-header .website-ai-backdrop { z-index: 10000; }
    .xc-header .website-ai-menu { z-index: 10001; }
}
@media (max-width: 700px) {
    .xc-header .website-ai-menu-body { display: block; padding: 22px 20px 36px; }
    .xc-header .website-ai-intro { border: 0; padding: 0; margin-bottom: 22px; gap: 10px; }
    .xc-header .website-ai-capability-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
    .xc-header .website-ai-shortcuts { grid-template-columns: 1fr; gap: 10px; }
    .xc-header .website-ai-model-columns { grid-template-columns: 1fr; gap: 22px; }
    .xc-header .website-ai-language-column { grid-column: auto; }
    .xc-header .website-ai-language-column .website-ai-model-list { grid-template-columns: 1fr; grid-template-rows: none; grid-auto-flow: row; }
    .xc-header .website-ai-industry-grid { grid-template-columns: 1fr; }
    .xc-header .website-ai-industry-grid article { padding: 18px; }
}
@keyframes website-ai-enter {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
    .xc-header .website-ai-menu { animation: none; }
}