:root,:root[data-theme="light"],:root.light{--kz-bg:#ffffff;--kz-bg-alt:#f8fafc;--kz-bg-card:#ffffff;--kz-bg-elevated:#ffffff;--kz-text:#0f172a;--kz-text-soft:#334155;--kz-text-muted:#64748b;--kz-border:#e2e8f0;--kz-border-strong:#cbd5e1;--kz-shadow:0 4px 12px rgba(0,0,0,0.06);--kz-shadow-lg:0 12px 32px rgba(0,0,0,0.10);color-scheme:light}
:root[data-theme="dark"],:root.dark{--kz-bg:#0f172a;--kz-bg-alt:#1e293b;--kz-bg-card:#1e293b;--kz-bg-elevated:#334155;--kz-text:#f1f5f9;--kz-text-soft:#cbd5e1;--kz-text-muted:#94a3b8;--kz-border:#334155;--kz-border-strong:#475569;--kz-shadow:0 4px 12px rgba(0,0,0,0.3);--kz-shadow-lg:0 12px 32px rgba(0,0,0,0.5);color-scheme:dark}
body{background:var(--kz-bg);color:var(--kz-text);transition:background 200ms ease,color 200ms ease}
.kz-section{background:var(--kz-bg)}
.kz-header{background:var(--kz-bg-card);border-color:var(--kz-border)}
.kz-card,.kz-book-card,.kz-search-result{background:var(--kz-bg-card);border-color:var(--kz-border)}
.kz-input,.kz-select,.kz-textarea{background:var(--kz-bg-card);color:var(--kz-text);border-color:var(--kz-border)}
.kz-input:focus,.kz-select:focus,.kz-textarea:focus{border-color:var(--kz-brand,#1B4F72);box-shadow:0 0 0 3px rgba(27,79,114,0.15)}
.kz-breadcrumbs a{color:var(--kz-text-soft)}
.kz-footer{background:var(--kz-bg-alt);color:var(--kz-text-soft);border-color:var(--kz-border)}
:root[data-theme="dark"] img,:root.dark img{opacity:0.92;transition:opacity 200ms}
:root[data-theme="dark"] img:hover,:root.dark img:hover{opacity:1}
body.kz-theme-loading{visibility:hidden}