/* 公共页头与页脚按 responsive-source-v1 共享视觉源维护。 */
:root{--public-shell-width:1280px;--public-header-height:62px;--public-blue:#1677ff;--public-line:#dde6f1;--public-text:#46546b;--public-surface:#fff}
*,*:before,*:after{box-sizing:border-box}html,body{max-width:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif}
.public-header{position:sticky;z-index:1000;top:0;width:100%;border-bottom:1px solid rgb(221 230 241 / 90%);background:rgb(255 255 255 / 96%);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
.header-inner{display:flex;align-items:center;gap:24px;width:min(var(--public-shell-width),calc(100% - 32px));min-height:var(--public-header-height);margin-inline:auto}
.brand{display:inline-flex;flex:0 0 auto;flex-direction:column;justify-content:center;color:#0870ec;line-height:1.12;text-decoration:none}.brand strong{font-size:18px;font-weight:800;letter-spacing:.02em}.brand small{margin-top:3px;color:#2c3c55;font-size:10px;letter-spacing:.04em}
.top-nav,.public-nav{display:flex;flex:1 1 auto;align-items:stretch;align-self:stretch;justify-content:center;gap:2px;min-width:0}.top-nav a,.public-nav a{position:relative;display:inline-flex;align-items:center;justify-content:center;min-width:48px;padding:0 12px;color:var(--public-text);font-size:14px;text-decoration:none;white-space:nowrap;transition:color .16s ease}.top-nav a:hover,.top-nav a.active,.top-nav a[aria-current="page"],.public-nav a:hover,.public-nav a.active,.public-nav a[aria-current="page"]{color:var(--public-blue)}.top-nav a.active:after,.top-nav a[aria-current="page"]:after,.public-nav a.active:after,.public-nav a[aria-current="page"]:after{position:absolute;right:12px;bottom:0;left:12px;height:2px;border-radius:2px 2px 0 0;background:var(--public-blue);content:""}
.header-tools{display:flex;flex:0 0 auto;align-items:center;gap:8px}.tool-link,.tool-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:0 11px;border:1px solid var(--public-line);border-radius:9px;background:var(--public-surface);color:#53627a;font-size:14px;text-decoration:none;white-space:nowrap}.tool-link:hover,.tool-btn:hover{border-color:#b9d5fb;color:var(--public-blue)}.public-school-btn span{font-size:15px;line-height:1}.user-btn{min-width:56px}
:where(a,button,input,select,textarea):focus-visible{outline:2px solid var(--public-blue);outline-offset:3px}
.public-footer{margin-top:24px;padding:0;border-top:1px solid var(--public-line);background:#fff;color:#1f2d45}.footer-inner{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:18px;width:min(var(--public-shell-width),calc(100% - 32px));min-height:64px;margin-inline:auto}.footer-inner strong{color:#183b6b;font-size:14px;white-space:nowrap}.footer-inner small{color:#94a1b1;font-size:12px;white-space:nowrap}.footer-links{display:flex;justify-content:center;gap:14px;min-width:0}.footer-links a{color:#718198;font-size:12px;text-decoration:none;white-space:nowrap}.footer-links a:hover{color:var(--public-blue)}.footer-trust{display:none}
@media(max-width:960px){.header-inner{gap:12px}.top-nav,.public-nav{justify-content:flex-start;overflow-x:auto;scrollbar-width:none}.top-nav::-webkit-scrollbar,.public-nav::-webkit-scrollbar{display:none}.top-nav a,.public-nav a{padding-inline:8px}.header-tools{gap:5px}.tool-link,.tool-btn{padding-inline:8px}}
@media(max-width:680px){:root{--public-header-height:58px}.header-inner{width:calc(100% - 24px);gap:10px}.brand strong{font-size:15px}.brand small{font-size:9px}.top-nav a,.public-nav a{min-width:49px;padding:0 8px;font-size:13px}.header-tools{display:none}.public-footer{margin-top:14px}.footer-inner{display:flex;flex-direction:column;align-items:flex-start;gap:8px;width:calc(100% - 24px);min-height:0;padding:18px 0}.footer-links{justify-content:flex-start;flex-wrap:wrap;gap:8px 14px}.footer-inner small{white-space:normal}}

/* 页头与手机快捷导航复用新视觉源的触控布局，保留正式路由。 */
.public-header{box-shadow:0 3px 14px rgb(35 88 154 / 6%)}
.public-header .header-inner{gap:18px;min-height:66px}
.public-header .brand{flex:0 0 160px;align-items:flex-start}
.public-header .brand strong{font-size:19px}
.public-header .brand small{font-size:11px}
.public-header .public-nav{justify-content:flex-start;gap:0}
.public-header .public-nav a{min-width:0;padding-inline:11px;color:#20314b;font-size:15px;font-weight:600}
.public-header .public-nav a:hover,.public-header .public-nav a.active{background:#f1f7ff;color:#1677f2}
.public-header .header-tools{gap:7px}
.public-header .header-tools .tool-btn,.public-header .header-tools .tool-link{min-height:38px;border-color:#e3ebf6;border-radius:10px;color:#50627b}
.public-header .header-tools .notice-btn{border-color:transparent}
.public-header .header-tools .mobile-channel-control{display:none}
.public-channel-menu{display:none}
.public-footer{border-color:#e3ebf6}
.public-footer .footer-inner{display:flex;justify-content:space-between;min-height:76px}
.public-footer .footer-inner strong{color:#1a477d;font-size:15px}
.public-footer .footer-inner span,.public-footer .footer-inner small{color:#8491a4;font-size:12px}
.public-mobile-navigation{display:none}
@media(max-width:1100px) and (min-width:801px){.public-header .header-inner{gap:12px}.public-header .brand{flex-basis:132px}.public-header .public-nav a{padding-inline:6px;font-size:14px}.public-header .header-tools .tool-btn,.public-header .header-tools .tool-link{padding-inline:8px}}
@media(max-width:800px){
  body{padding-bottom:calc(66px + env(safe-area-inset-bottom))}
  .public-header .header-inner{gap:10px;min-height:58px;padding-block:4px}
  .public-header .brand{flex:0 1 auto;margin-right:auto}
  .public-header .public-nav{display:none}
  .public-header .header-tools{display:flex;flex:1 1 auto;min-width:0;justify-content:flex-end;gap:6px}
  .public-header .header-tools .tool-btn,.public-header .header-tools .tool-link{min-height:44px}
  .public-header .header-tools .mobile-channel-control{display:inline-flex;align-items:center;gap:5px;min-width:58px;padding-inline:8px;background:#f1f7ff;color:#1677f2;font-size:13px;font-weight:700}
  .public-header .header-tools .tool-link,.public-header .header-tools .notice-btn{display:none}
  /* 登录后昵称可能较长，手机页头保留入口并以省略号约束宽度。 */
  .public-header .header-tools .user-btn{display:block;min-width:54px;max-width:96px;overflow:hidden;text-overflow:ellipsis;line-height:42px;text-align:center;background:#eaf3ff;color:#1677f2;font-size:13px;font-weight:700}
  .public-header .header-tools .public-school-btn{max-width:140px;overflow:hidden;text-overflow:ellipsis}
  .public-header .header-tools .public-school-btn span{overflow:hidden;text-overflow:ellipsis}
  .public-channel-menu:not([hidden]){position:absolute;top:calc(100% + 4px);right:12px;left:12px;z-index:1002;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;max-height:72vh;padding:12px;overflow-y:auto;border:1px solid #e3ebf6;border-radius:14px;background:#fff;box-shadow:0 5px 18px rgb(40 78 125 / 12%)}
  .public-channel-menu a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-height:64px;border:1px solid #e3ebf6;border-radius:9px;background:#f7faff;color:#345879;font-size:13px;font-weight:600;text-decoration:none}
  .public-channel-menu a i{color:#1677f2;font-size:18px}
  .public-channel-menu a[aria-current="page"]{border-color:#1677f2;background:#1677f2;color:#fff}
  .public-channel-menu a[aria-current="page"] i{color:#fff}
  .public-footer .footer-inner{flex-direction:column;align-items:flex-start;justify-content:center;gap:4px;min-height:0;padding-block:16px}
  .public-mobile-navigation{position:fixed;right:0;bottom:0;left:0;z-index:1001;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));height:calc(64px + env(safe-area-inset-bottom));padding:4px max(4px,env(safe-area-inset-left)) calc(4px + env(safe-area-inset-bottom)) max(4px,env(safe-area-inset-right));border-top:1px solid #dfe8f4;background:rgb(255 255 255 / 97%);box-shadow:0 -4px 18px rgb(43 72 110 / 6%)}
  .public-mobile-navigation a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-width:0;min-height:54px;color:#738198;font-size:11px;line-height:1.3;text-decoration:none}
  .public-mobile-navigation i{font-size:19px}
  .public-mobile-navigation a[aria-current="page"]{color:#1677f2;font-weight:700}
  .public-mobile-navigation .public-mobile-publish{color:#1677f2;font-weight:700}
  .public-mobile-navigation .public-mobile-publish i{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#1677f2;color:#fff;font-size:17px}
}
@media(max-width:600px){.public-header .brand strong{font-size:17px}.public-header .brand small{font-size:10px}.public-header .header-tools .tool-btn{padding-inline:8px;font-size:13px}}
@media(max-width:380px){.public-header .brand{max-width:110px}.public-header .brand strong{font-size:15px}.public-header .brand small{font-size:9px}.public-header .header-tools{gap:4px}.public-header .header-tools .mobile-channel-control{min-width:52px;padding-inline:5px}.public-header .header-tools .public-school-btn{max-width:74px;padding-inline:5px}.public-header .header-tools .user-btn{min-width:42px;padding-inline:5px}}
@media(max-width:680px){.public-footer .footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%;gap:0}.public-footer .footer-links a{display:grid;place-items:center;min-height:44px;border-bottom:1px solid #edf1f5}.public-footer .footer-links a:last-child{grid-column:1/-1}}
@media(max-width:360px){.public-footer .footer-links{grid-template-columns:1fr}.public-footer .footer-links a:last-child{grid-column:auto}}