/* Shared optional theme. File previews, QR pixels and exported content keep their original colors. */
.header.hub-header{grid-template-columns:auto minmax(0,1fr) auto auto}
.header-quick-actions{display:flex;align-items:center;gap:8px;grid-column:4;grid-row:1}
.theme-toggle{display:grid;place-items:center;flex:none;width:44px;height:44px;padding:10px;border:1px solid #576279;border-radius:10px;background:#40392f;color:#88b0ff;cursor:pointer;transition:background .18s,border-color .18s}
.theme-toggle[hidden]{display:none}
.theme-toggle:hover{background:#1f2738;border-color:#e5afba}
.theme-toggle:focus-visible{outline:2px solid #e5afba;outline-offset:3px}
.theme-toggle svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.theme-toggle .theme-sun{display:none}
[data-theme=dark] .theme-toggle .theme-sun{display:block}
[data-theme=dark] .theme-toggle .theme-moon{display:none}
@media(max-width:1150px){.header.hub-header{grid-template-columns:minmax(0,1fr) auto auto}.header-quick-actions{grid-column:3}.header.hub-header nav{grid-column:1/-1}}
@media(max-width:760px){.header.hub-header{grid-template-columns:minmax(0,1fr) auto}.header-quick-actions{grid-column:2;gap:6px}.theme-toggle{width:44px;height:44px}.header.hub-header .header-actions{grid-column:auto}}
@media(max-width:360px){.header.hub-header .brand{font-size:17px}.header.hub-header .brand-mark{width:30px;height:32px}.theme-toggle{width:40px}}
@media(prefers-reduced-motion:reduce){.theme-toggle{transition:none}}
@media print{.header-quick-actions{display:none}}

@media screen {
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:root[data-theme=dark] body,:root[data-theme=dark] .app-shell{background:var(--canvas);color:var(--ink)}
:root[data-theme=dark] ::selection{background:#e5afba;color:#fff9ee}
:root[data-theme=dark] :focus-visible{outline-color:#e5afba}
:root[data-theme=dark] :is(h1,h2,h3,h4,legend,label){color:var(--ink)}
:root[data-theme=dark] h1>span,:root[data-theme=dark] .hub-value>h2 span{color:var(--accent)}
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:root[data-theme=dark] :is(.panel-title,.action-area,.advanced-settings,.pdf-action,.pdf-summary,.pdf-toolbar,.organize-panel-heading,.match-overview,.preview-heading,.preview-footer,.hub-value,.premium-hero,.tools-section-heading,.home-journal,.article-end,.about-principles,.finance-heading,.finance-table-wrap,.finance-table-wrap th,.finance-table-wrap td){border-color:var(--edge)}
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:root[data-theme=dark] :is(.hero-search-shell,.tool-command,.command-menu,.empty-search,.document-actions,.preview-dialog){background:var(--surface);border-color:var(--control-edge);box-shadow:0 14px 40px #0004}
:root[data-theme=dark] .hero-search-shell:focus-within{outline-color:#e5afba;border-color:#e5afba}
:root[data-theme=dark] .premium-hero .hub-search{background:transparent}
:root[data-theme=dark] .hub-search input{color:var(--ink);background:transparent}
:root[data-theme=dark] :is(.hub-search input,.utility-panel input,.utility-panel textarea,.input-unit input)::placeholder{color:#9da6b9;opacity:1}
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:root[data-theme=dark] .tool-card[data-search*="upload check"]{background:#182133}
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:root[data-theme=dark] :is(.dropzone,.pdf-drop,.organize-drop).drag-over{background:var(--warm);border-color:var(--accent);box-shadow:inset 0 0 0 2px var(--accent)}
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:root[data-theme=dark] :is(.upload-icon,.upload-backplate){background:var(--raised);border-color:var(--edge);color:var(--accent)}
:root[data-theme=dark] :is(.input-unit,.select-wrap,select,textarea,input:not([type=checkbox]):not([type=radio]):not([type=range]):not([type=file]):not([type=submit]):not([type=button])){background:#121417;border-color:var(--control-edge);color:var(--ink)}
:root[data-theme=dark] :is(input,textarea)::placeholder{color:#9da6b9;opacity:1}
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:root[data-theme=dark] .input-unit input,:root[data-theme=dark] .input-unit select,:root[data-theme=dark] .premium-hero .hub-search input{background:transparent}
:root[data-theme=dark] :is(input[type=range],input[type=checkbox],progress){accent-color:var(--accent)}
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:root[data-theme=dark] :is(.utility-budget.over,.finance-stat-negative strong,.check-result.fail span,.file-status.error){color:var(--error-text)}
:root[data-theme=dark] :is(.keyword-list.missing span,.file-status.processing){background:var(--warm);border-color:var(--edge);color:var(--accent)}
:root[data-theme=dark] .pdf-editor.organize-layout{background:var(--surface);border-color:var(--edge);box-shadow:none}
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:root[data-theme=dark] .qr-sheet{color-scheme:light;background:#fff;color:#111}
/* Secondary copy and nested states need the same contrast as the main workspace. */
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}