/* 深色为默认，所有网页使用同一组语义色。 */
:root,[data-theme="dark"] {
  color-scheme:dark;
  --ui-bg:#0b1220;--ui-surface:#121e30;--ui-surface-alt:#192940;
  --ui-text:#e8eff9;--ui-muted:#a4b4ca;--ui-border:#2b3b52;
  --ui-primary:#3267d5;--ui-on-primary:#ffffff;--ui-soft:#203553;
  --ui-link:#a8c7ff;--ui-success:#93d8bd;--ui-warning:#f4cb81;--ui-error:#ffaaaa;
  --ui-shadow:0 16px 50px #00000026;--ui-header:rgba(18,30,48,.9);
}
[data-theme="light"] {
  color-scheme:light;
  --ui-bg:#f3f6fa;--ui-surface:#ffffff;--ui-surface-alt:#eaf0f7;
  --ui-text:#172c49;--ui-muted:#52657d;--ui-border:#cad5e3;
  --ui-primary:#1d50ad;--ui-on-primary:#ffffff;--ui-soft:#e5edfc;
  --ui-link:#245dcc;--ui-success:#176448;--ui-warning:#805600;--ui-error:#ac3039;
  --ui-shadow:0 16px 50px #172c4910;--ui-header:rgba(255,255,255,.92);
}
html{background:var(--ui-bg);color:var(--ui-text)}
[data-theme-toggle]{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:88px;padding:9px 14px;border:1px solid var(--ui-border);border-radius:24px;background:var(--ui-surface-alt);color:var(--ui-text);font:inherit;font-size:14px;white-space:nowrap;cursor:pointer;flex-shrink:0;transition:border-color .18s}
[data-theme-toggle]:hover{border-color:var(--ui-link)}
:focus-visible{outline:2px solid var(--ui-link);outline-offset:4px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}

/* 公共蓝色液态玻璃；Harness 在独立主题中覆盖色调。 */
:root,[data-theme="dark"]{--glass-tint:104,167,255;--glass-base:18,30,48;--glass-opacity:.7;--glass-edge:rgba(165,204,255,.3);--glass-glint:rgba(220,237,255,.19);--glass-shadow:rgba(2,12,32,.28)}
[data-theme="light"]{--glass-tint:55,126,230;--glass-base:228,239,255;--glass-opacity:.76;--glass-edge:rgba(69,125,200,.35);--glass-glint:rgba(255,255,255,.9);--glass-shadow:rgba(36,85,160,.24)}
.site-header{background:var(--ui-surface);border:1px solid var(--glass-edge);box-shadow:inset 0 1px 0 var(--glass-glint),inset 0 -1px 0 rgba(var(--glass-tint),.1),0 12px 34px -12px var(--glass-shadow)}
@supports ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
.site-header{background:linear-gradient(125deg,var(--glass-glint),transparent 32%,rgba(var(--glass-tint),.06) 78%,var(--glass-glint)),rgba(var(--glass-base),var(--glass-opacity));-webkit-backdrop-filter:blur(20px) saturate(145%);backdrop-filter:blur(20px) saturate(145%)}
:is([data-theme-toggle],.cli-motion-toggle){background:linear-gradient(145deg,var(--glass-glint),transparent 55%),rgba(var(--glass-base),.72);-webkit-backdrop-filter:blur(10px) saturate(130%);backdrop-filter:blur(10px) saturate(130%)}
}
:is(.login-link,.action-primary,[data-theme-toggle],.cli-motion-toggle){position:relative;isolation:isolate;overflow:hidden;border:1px solid var(--glass-edge);box-shadow:inset 0 1px 0 var(--glass-glint),inset 0 -1px 0 rgba(var(--glass-tint),.15),0 5px 14px -8px var(--glass-shadow);transition:box-shadow .2s,border-color .2s,transform .2s}
:is(.login-link,.action-primary){background:linear-gradient(135deg,rgba(255,255,255,var(--primary-glint,.24)),transparent 50%,rgba(var(--glass-tint),var(--primary-glint,.24))),color-mix(in srgb,var(--ui-primary) var(--primary-opacity,86%),transparent);color:var(--ui-on-primary);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
:is(.login-link,.action-primary,[data-theme-toggle],.cli-motion-toggle)::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background:linear-gradient(105deg,transparent 20%,rgba(255,255,255,var(--button-shine,.18)) 46%,transparent 72%);transform:translateX(-115%);transition:transform .45s ease}
@media(hover:hover){:is(.login-link,.action-primary,[data-theme-toggle],.cli-motion-toggle):hover::before{transform:translateX(70%)}:is(.login-link,.action-primary,[data-theme-toggle],.cli-motion-toggle):hover{border-color:var(--ui-link);box-shadow:inset 0 1px 0 var(--glass-glint),0 8px 20px -10px rgba(var(--glass-tint),.48)}}
:is(.login-link,.action-primary,[data-theme-toggle],.cli-motion-toggle):active{transform:scale(.98)}
.site-header nav a{padding:10px 9px;border-radius:18px}.site-header nav a.active{background:linear-gradient(145deg,var(--glass-glint),rgba(var(--glass-tint),.12));box-shadow:inset 0 0 0 1px rgba(var(--glass-tint),.22),inset 0 1px 0 var(--glass-glint);color:var(--ui-link)}
@media(max-width:700px){.site-header{gap:8px 12px}.site-header nav a{padding:9px 5px}.site-header{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}}
@media(prefers-reduced-transparency:reduce){.site-header,:is(.login-link,.action-primary,[data-theme-toggle],.cli-motion-toggle,.admin-page button){-webkit-backdrop-filter:none;backdrop-filter:none;background:var(--ui-surface)}:is(.login-link,.action-primary){background:var(--ui-primary)}}
@media(prefers-reduced-motion:reduce){:is(.login-link,.action-primary,[data-theme-toggle],.cli-motion-toggle)::before{display:none}}

/* 浅色玻璃与深色文字成对；白字主按钮保留足够深的实色承托。 */
[data-theme="light"]{--primary-glint:.06;--primary-opacity:100%;--button-shine:.05}
[data-theme="light"] :is([data-theme-toggle],.cli-motion-toggle){color:var(--ui-text)}
.admin-page button[aria-pressed="true"]{background:var(--ui-primary);color:var(--ui-on-primary);border-color:var(--ui-primary);box-shadow:none}
[data-theme="light"] .site-header nav a{color:var(--ui-muted)}
[data-theme="light"] .site-header nav a.active,[data-theme="light"] .site-header nav a:hover{color:var(--ui-link)}

/* 日间用有色轮廓与双层反光表现玻璃厚度，文字区域保持浅色。 */
[data-theme="light"] .site-header{background:linear-gradient(115deg,rgba(255,255,255,.82),rgba(var(--glass-tint),.11) 32%,rgba(255,255,255,.4) 60%,rgba(var(--glass-tint),.15)),rgba(var(--glass-base),var(--glass-opacity));box-shadow:inset 0 2px 0 rgba(255,255,255,.95),inset 0 -2px 0 rgba(var(--glass-tint),.16),0 12px 32px -12px var(--glass-shadow),0 2px 5px rgba(var(--glass-tint),.09)}
[data-theme="light"] :is([data-theme-toggle],.cli-motion-toggle){border-color:var(--glass-edge);box-shadow:inset 0 2px 0 rgba(255,255,255,.95),inset 0 -2px 0 rgba(var(--glass-tint),.12),0 5px 12px -5px var(--glass-shadow)}
[data-theme="light"] .site-header nav a.active{background:linear-gradient(150deg,rgba(255,255,255,.8),rgba(var(--glass-tint),.16));box-shadow:inset 0 0 0 1px rgba(var(--glass-tint),.28),inset 0 2px 0 rgba(255,255,255,.8),0 3px 8px -5px var(--glass-shadow)}
@media(prefers-reduced-transparency:reduce){[data-theme="light"] .site-header{background:var(--ui-surface)}}

/* 图标按钮缩小为 22px；颜色继承蓝色/粉紫色主题。 */
[data-theme-toggle],.site-header [data-theme-toggle],.admin-page [data-theme-toggle]{width:22px;min-width:22px;height:22px;min-height:22px;padding:0;border-radius:50%}
[data-theme-toggle] svg{width:14px;height:14px;display:block;flex-shrink:0;pointer-events:none}

/* 管理工作台采用实色表面，主题按钮也不继承公共网站的玻璃效果。 */
body.admin-page .topbar,body.admin-page #management-dialog{background:var(--ui-surface);border-color:var(--ui-border);box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none}
body.admin-page #management-dialog::backdrop{background:rgba(4,12,28,.6);-webkit-backdrop-filter:none;backdrop-filter:none}
body.admin-page [data-theme-toggle],body.admin-page [data-theme-toggle]:hover{background:var(--ui-surface);border-color:var(--ui-border);box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none}
body.admin-page [data-theme-toggle]::before{display:none}