/* One palette across navigation, lessons, exams and professional spaces. */
:root{color-scheme:light;--bg:#f5f6f8;--paper:#ffffff;--surface:#edf1f5;--text:#1b2c40;--muted:#526377;--line:#c4cdd8;--control-line:#738297;--primary:#365785;--primary-hover:#29456d;--on-primary:#ffffff;--primary2:#e7edf5;--teal:#146b64;--success:#17664c;--danger:#a52b37;--focus:#82571a;--shadow:0 8px 28px #1b2c4008;--atlas-gold:#775727;--atlas-soft:var(--surface);--atlas-ink:var(--primary);--atlas-on-ink:var(--on-primary);--atlas-on-ink-muted:#e3eaf3;--ink:var(--text);--accent:var(--primary);--light:var(--primary2);--card:var(--paper)}
:root[data-theme=dark]{color-scheme:dark;--bg:#172332;--paper:#202f41;--surface:#293b50;--text:#e2e8f0;--muted:#b5c1d0;--line:#52647a;--control-line:#8b9db3;--primary:#a7c3e8;--primary-hover:#bfd2ed;--on-primary:#182b43;--primary2:#304764;--teal:#8cd0c3;--success:#91d6bb;--danger:#ffabb4;--focus:#eac38b;--atlas-gold:#dfc399;--atlas-on-ink-muted:#233e5b;--shadow:0 8px 28px #0d16200d}
html{background:var(--bg);color:var(--text);scroll-padding-top:104px}body{background:var(--bg);color:var(--text)}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px}button,input,select,textarea{accent-color:var(--primary)}button:disabled{cursor:not-allowed;opacity:.65}a,button,input,select,textarea{touch-action:manipulation}img,svg{max-width:100%}img{height:auto}p,li,h1,h2,h3,td,th{overflow-wrap:break-word}.good,.successc{color:var(--success)}.bad,.error,.errorc{color:var(--danger)}
.theme-control{min-width:44px;min-height:44px;border:1px solid var(--control-line);background:var(--paper);color:var(--text);border-radius:12px;cursor:pointer}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto!important}*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Standalone practices keep their question layout and native image colours. */
.atlas-thematic{--ink:var(--text);--accent:var(--primary);--light:var(--primary2);font-family:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif}
.atlas-thematic .card,.atlas-thematic dialog,.atlas-thematic textarea,.atlas-thematic select{background:var(--paper);color:var(--text)}
.atlas-thematic .source,.atlas-thematic .feedback,.atlas-thematic .review-note{background:var(--surface);color:var(--text)}
.atlas-thematic button,.atlas-thematic a.btn{background:var(--primary);color:var(--on-primary);min-height:44px}.atlas-thematic button.secondary{background:var(--primary2);color:var(--text)}
.atlas-thematic button:hover{filter:none;background:var(--primary-hover)}.atlas-thematic .theme-control{position:fixed;top:12px;right:16px;z-index:5;background:var(--paper);color:var(--text)}
.atlas-thematic textarea,.atlas-thematic select{border-color:var(--control-line)}
.atlas-thematic .nav a.good{background:var(--surface);border-color:var(--success);color:var(--text)}.atlas-thematic .nav a.bad{background:var(--surface);border-color:var(--danger);color:var(--text)}
.atlas-thematic .correct .verdict{color:var(--success)}.atlas-thematic .incorrect .verdict{color:var(--danger)}
.atlas-thematic .nav a.good::after{content:'✓';font-weight:800}.atlas-thematic .nav a.bad::after{content:'×';font-weight:800}
.atlas-thematic .question.correct{border-color:var(--success)}.atlas-thematic .question.incorrect{border-color:var(--danger)}
.atlas-thematic .nav{grid-template-columns:repeat(4,minmax(0,1fr))}.atlas-thematic .nav a{min-height:44px}.atlas-thematic dialog{border-color:var(--line)}
.atlas-thematic .layout>*{min-width:0}.atlas-thematic .source{overflow-wrap:anywhere}.atlas-thematic header h1{padding-right:24px}
/* Existing classroom fields were fixed white. */
.classwrap .pane,.classwrap .field,.classwrap .classnav button{background:var(--paper);color:var(--text);border-color:var(--control-line)}
.classwrap .hint,.classwrap small{color:var(--muted)}.classwrap .btnc,.classwrap .classnav button.active{background:var(--primary);color:var(--on-primary)}.classwrap .btnc.alt,.classwrap .chipc{background:var(--primary2);color:var(--text)}.classwrap .btnc.danger{background:var(--surface);color:var(--danger)}.classwrap header{position:relative;padding-right:55px}.classwrap header .theme-control{position:absolute;right:0;top:0}.classwrap main{padding:0;min-width:0}.classwrap .layout2>*{min-width:0}.classwrap .itemc{border-color:var(--line)}
@media print{.theme-control{display:none!important}.atlas-thematic{--bg:#fff;--paper:#fff;--text:#000;--muted:#333;--surface:#fff;--line:#888;--primary:#000;--on-primary:#fff;--primary2:#fff;color-scheme:light}}
.atlas-thematic button.secondary:hover,.atlas-thematic button.theme-control:hover{background:var(--surface);color:var(--text)}
@media(max-width:680px){html{scroll-padding-bottom:90px}:focus{scroll-margin-bottom:90px}}