/* AI+ 下拉导航：半透明磨砂白底，左侧主张块用流动的品牌蓝。数据来自 inc/nav-data.php。 */
/* 其他栏目下拉：保持深蓝和白字，透明度提高到看得见背后的内容（Haning 2026-11-04）。这个不透明度下，背后是纯白时白字仍达标；再降要重测对比度。 */
.ztc-panel:not(.ztc-panel--ai) { background: rgba(0, 70, 126, .6); -webkit-backdrop-filter: blur(30px) saturate(150%) brightness(.55); backdrop-filter: blur(30px) saturate(150%) brightness(.55); }
/* 底变透后，原来偏淡的小字和青色链接提亮，背后是白色时也够读 */
.ztc-panel:not(.ztc-panel--ai) :is(.ztc-panel-left p, .ztc-pro-introdesc) { color: rgba(255, 255, 255, .86); }
.ztc-panel:not(.ztc-panel--ai) :is(.ztc-pro-desc, .ztc-updates-categories small, .ztc-updates-featured em, .ztc-updates-latest > a small) { color: rgba(255, 255, 255, .84); }
.ztc-panel:not(.ztc-panel--ai) :is(.ztc-panel-leftlink, .ztc-pro-slogan, .ztc-updates-featured small, .ztc-updates-latest > p, .ztc-updates-latest > a span) { color: #bde9f9; }
.ztc-panel:not(.ztc-panel--ai) .ztc-panel-leftlink:hover { color: #fff; }
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) { .ztc-panel:not(.ztc-panel--ai) { background: rgba(0, 70, 126, .97); } }
.ztc-panel--ai { background: rgba(255, 255, 255, .78); -webkit-backdrop-filter: blur(30px) saturate(150%); backdrop-filter: blur(30px) saturate(150%); color: var(--ztc-text); overflow: auto; max-height: calc(100dvh - 120px); border-color: rgba(255, 255, 255, .55); box-shadow: 0 30px 70px -20px rgba(4, 24, 44, .4); }
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) { .ztc-panel--ai { background: rgba(255, 255, 255, .97); } }
.ai-nav-layout { display: grid; grid-template-columns: 236px minmax(0, 1fr); gap: 36px; padding: 18px 36px 22px 18px; }
.ai-nav-layout aside { position: relative; isolation: isolate; overflow: hidden; display: flex; flex-direction: column; padding: 22px 22px 8px; border-radius: 14px; color: #fff; background: linear-gradient(122deg, #0a466f 0%, #0067b4 100%); }
.ai-nav-layout aside::before { content: ''; position: absolute; z-index: -1; left: -30%; top: -30%; width: 160%; height: 160%; background: radial-gradient(38% 38% at 62% 34%, rgba(79, 194, 223, .24), transparent 72%), radial-gradient(34% 34% at 30% 74%, rgba(0, 142, 211, .34), transparent 72%); }
/* 动效只在面板展开时运行 */
.ztc-panel--ai[aria-hidden="false"] .ai-nav-layout aside::before { animation: ai-nav-drift 14s ease-in-out infinite alternate; }
@keyframes ai-nav-drift { from { transform: translate3d(-8%, -6%, 0) rotate(0deg); } to { transform: translate3d(10%, 8%, 0) rotate(18deg); } }
.ai-nav-layout aside p { margin: 0 0 14px; font-size: 13px; font-weight: 600; letter-spacing: .06em; color: #fff; }
.ai-nav-layout aside h2 { margin: 0 0 auto; padding-bottom: 22px; color: #fff; font: 600 25px/1.4 var(--ztc-serif); letter-spacing: -.01em; }
.ai-nav-layout aside h2 span { color: #ffdd80; }
.ai-nav-layout aside a { display: flex; align-items: center; justify-content: space-between; min-height: 44px; font-size: 14px; font-weight: 600; color: #fff; border-top: 1px solid rgba(255, 255, 255, .3); transition: padding .3s cubic-bezier(.2, .75, .2, 1); }
.ai-nav-layout aside a:hover { padding-left: 6px; }
.ai-nav-groups { display: grid; grid-template-columns: 1fr 1fr 1.2fr 1.1fr; gap: 28px; padding-top: 16px; }
.ai-nav-groups h3 { margin: 0 0 6px; padding-bottom: 12px; font: 600 13px/1.5 var(--ztc-sans); letter-spacing: .06em; color: #4b5161; border-bottom: 1px solid rgba(10, 43, 76, .14); }
.ai-nav-groups a { position: relative; display: block; min-height: 58px; padding: 9px 0; color: var(--ztc-text); line-height: 1.55; transition: padding .3s cubic-bezier(.2, .75, .2, 1); }
.ai-nav-groups a::before { content: ''; position: absolute; left: 0; top: 19px; width: 0; height: 2px; background: var(--ztc-brand-primary); transition: width .3s cubic-bezier(.2, .75, .2, 1); }
.ai-nav-groups a strong { display: block; font-size: 15px; font-weight: 600; transition: color .2s; }
.ai-nav-groups a small { display: block; margin-top: 1px; font-size: 12.5px; color: #4b5161; }
.ai-nav-groups a:hover, .ai-nav-groups a:focus-visible { padding-left: 16px; }
.ai-nav-groups a:hover::before, .ai-nav-groups a:focus-visible::before { width: 10px; }
.ai-nav-groups a:hover strong, .ai-nav-groups a:focus-visible strong { color: var(--ztc-action); }
.ai-nav-bottom { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 10px 36px 10px 18px; border-top: 1px solid rgba(10, 43, 76, .12); background: rgba(255, 255, 255, .36); }
.ai-nav-bottom > div { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 24px; padding-left: 22px; font-size: 13.5px; }
.ai-nav-bottom span { color: #4b5161; }
.ai-nav-bottom a { display: inline-flex; align-items: center; min-height: 44px; color: var(--ztc-text); transition: color .2s; }
.ai-nav-bottom a:hover { color: var(--ztc-action); }
/* 进入智库：和顶部“AI 智库”同一圈品牌色光；面板展开时一直在转，更显眼 */
@property --ai-nav-orbit { syntax: "<angle>"; initial-value: 0deg; inherits: false; }
@keyframes ai-nav-orbit { to { --ai-nav-orbit: 360deg; } }
.ai-nav-bottom .ai-nav-kb { position: relative; isolation: isolate; flex-shrink: 0; min-height: 44px; padding: 8px 22px; border-radius: 999px; background: var(--ztc-action); color: #fff; font-size: 14px; font-weight: 600; }
.ai-nav-bottom .ai-nav-kb::before, .ai-nav-bottom .ai-nav-kb::after { content: ''; position: absolute; inset: -3px; padding: 3px; border-radius: inherit; pointer-events: none; background: conic-gradient(from var(--ai-nav-orbit), var(--ztc-brand-primary), var(--ztc-brand-cyan), var(--ztc-brand-amber), var(--ztc-brand-navy), var(--ztc-brand-cyan), var(--ztc-brand-primary)); -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0); -webkit-mask-composite: xor; mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0); mask-composite: exclude; }
.ai-nav-bottom .ai-nav-kb::before { inset: -7px; padding: 7px; filter: blur(8px); opacity: .75; }
.ztc-panel--ai[aria-hidden="false"] .ai-nav-kb::before, .ztc-panel--ai[aria-hidden="false"] .ai-nav-kb::after { animation: ai-nav-orbit 4s linear infinite; }
.ai-nav-bottom .ai-nav-kb:hover { background: var(--ztc-action-hover); color: #fff; }
.ztc-panel--ai :focus-visible { outline: 2px solid var(--ztc-action); outline-offset: 2px; border-radius: 3px; }
.ztc-panel--ai aside :focus-visible { outline-color: #fff; }
.ai-drawer-subgroup { border-top: 1px solid color-mix(in srgb, var(--ztc-white) 16%, transparent); }
.ai-drawer-subgroup > summary { min-height: 48px; display: flex; align-items: center; justify-content: space-between; font-size: 15px; cursor: pointer; }
.ai-drawer-subgroup > summary::after { content: '＋'; }
.ai-drawer-subgroup[open] > summary::after { content: '−'; }
.ai-drawer-kb { display: flex; align-items: center; justify-content: center; min-height: 48px; border: 1px solid color-mix(in srgb, var(--ztc-white) 30%, transparent); border-radius: 8px; margin: 12px 0 18px; color: var(--ztc-white); }
@media (prefers-reduced-motion: reduce) { .ztc-panel--ai[aria-hidden="false"] .ai-nav-layout aside::before, .ztc-panel--ai[aria-hidden="false"] .ai-nav-kb::before, .ztc-panel--ai[aria-hidden="false"] .ai-nav-kb::after { animation: none; } }
.ai-still .ztc-panel--ai[aria-hidden="false"] .ai-nav-layout aside::before, .ai-still .ztc-panel--ai[aria-hidden="false"] .ai-nav-kb::before, .ai-still .ztc-panel--ai[aria-hidden="false"] .ai-nav-kb::after { animation: none; }
@media (forced-colors: active) { .ai-nav-bottom .ai-nav-kb::before, .ai-nav-bottom .ai-nav-kb::after { display: none; } }
@media (max-width: 1200px) {
  .ai-nav-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 22px; padding: 16px 24px 20px 16px; }
  .ai-nav-groups { gap: 16px; }
  .ai-nav-layout aside { padding: 18px 16px 6px; }
  .ai-nav-layout aside h2 { font-size: 21px; }
  .ai-nav-groups a strong { font-size: 14px; }
}