:root {
  color-scheme: light;
  --cp-bg: #f7f4ef;
  --cp-bg-elevated: #fcfbf8;
  --cp-surface: #ffffff;
  --cp-surface-soft: #f5f5f5;
  --cp-border: #dedede;
  --cp-border-strong: #919191;
  --cp-text: #242424;
  --cp-text-muted: #5c5c5c;
  --cp-text-soft: #6f6f6f;
  --cp-accent: #b11f4b;
  --cp-accent-hover: #9a1a41;
  --cp-accent-soft: rgba(177, 31, 75, 0.08);
  --cp-accent-fg: #ffffff;
  --cp-success: #16a34a;
  --cp-danger: #dc2626;
  --cp-warning: #f59e0b;
  --cp-link: #0078d4;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.12);
  --cp-overlay: rgba(255, 255, 255, 0.8);
  --cp-panel: rgba(255, 255, 255, 0.86);
  --cp-panel-strong: rgba(255, 255, 255, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.55);
  --cp-highlight: rgba(177, 31, 75, 0.12);
}
html[data-theme="dark"] {
  color-scheme: dark;
  --cp-bg: #3d3b3a;
  --cp-bg-elevated: #343231;
  --cp-surface: #292929;
  --cp-surface-soft: #2e2e2e;
  --cp-border: #474747;
  --cp-border-strong: #5f5f5f;
  --cp-text: #dedede;
  --cp-text-muted: #919191;
  --cp-text-soft: #b0b0b0;
  --cp-accent: #fd8ea1;
  --cp-accent-hover: #fb7b91;
  --cp-accent-soft: rgba(253, 142, 161, 0.14);
  --cp-accent-fg: #1a1a1a;
  --cp-success: #4ade80;
  --cp-danger: #f87171;
  --cp-warning: #fbbf24;
  --cp-link: #4da6ff;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.32);
  --cp-overlay: rgba(41, 41, 41, 0.88);
  --cp-panel: rgba(41, 41, 41, 0.72);
  --cp-panel-strong: rgba(41, 41, 41, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.04);
  --cp-highlight: rgba(253, 142, 161, 0.12);
}
html[data-theme="dark"] { --cp-text-muted: var(--cp-text-soft); --cp-border-strong: var(--cp-text-soft); }
* { box-sizing: border-box; }
body { margin: 0; background: var(--cp-bg); color: var(--cp-text); font: 1rem/1.65 "Segoe UI", Aptos, Calibri, -apple-system, BlinkMacSystemFont, sans-serif; }
a { color: var(--cp-accent); text-underline-offset: .2em; }
button, input, select { font: inherit; }
button, input, select, summary { min-height: 44px; }
button, select, summary { cursor: pointer; }
button { padding: .65rem 1rem; border: 1px solid var(--cp-accent); border-radius: .625rem; background: var(--cp-accent); color: var(--cp-accent-fg); font-weight: 600; }
button:hover { background: var(--cp-accent-hover); }
button:disabled { cursor: not-allowed; background: var(--cp-surface-soft); border-color: var(--cp-border); color: var(--cp-text-muted); }
button.secondary { background: var(--cp-surface); color: var(--cp-text); border-color: var(--cp-border-strong); }
button.secondary:hover:not(:disabled) { background: var(--cp-accent-soft); border-color: var(--cp-accent); }
:focus-visible { outline: 3px solid var(--cp-accent); outline-offset: 4px; }
[hidden] { display: none !important; }
.site-header, main, footer { max-width: 1120px; margin: auto; padding-inline: 24px; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 24px; border-bottom: 1px solid var(--cp-border); }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--cp-text); font-weight: 750; font-size: 1.3rem; text-decoration: none; }
.brand-mark { display: grid; place-items: center; background: var(--cp-accent); color: var(--cp-accent-fg); border-radius: .625rem; width: 40px; height: 40px; }
.header-note, .eyebrow, .independence, footer { color: var(--cp-text-muted); }
.eyebrow { text-transform: uppercase; letter-spacing: .1em; font-size: .75rem; font-weight: 700; margin: 0 0 12px; }
.hero { padding-block: 56px 40px; max-width: 820px; }
h1 { font-size: clamp(2rem, 6vw, 3.6rem); line-height: 1.12; letter-spacing: -.04em; margin: 0 0 24px; }
h2 { font-size: 1.5rem; line-height: 1.3; margin: 0 0 16px; }
h3, h4 { line-height: 1.4; margin: 0; }
.hero > p:not(.eyebrow) { max-width: 680px; }
.independence { font-size: .9rem; border-left: 3px solid var(--cp-accent); padding-left: 16px; }
.subjects { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: 16px; }
.subject { padding: 24px; background: var(--cp-surface); border: 1px solid var(--cp-border); border-radius: 16px; }
.subject-number { color: var(--cp-accent); font-size: .875rem; font-weight: 700; }
.subject p { margin-block: 8px 16px; color: var(--cp-text-muted); }
.course-link { display: inline-flex; align-items: center; min-height: 44px; padding: .65rem 1rem; border-radius: .625rem; background: var(--cp-accent); color: var(--cp-accent-fg); font-weight: 600; text-decoration: none; }
.course-link:hover { background: var(--cp-accent-hover); }
.back-link { display: inline-flex; align-items: center; min-height: 44px; margin-bottom: 24px; }
.course-heading { padding-top: 24px; }
.workspace { margin-block: 48px; }
.section-heading { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.section-heading h2 { margin-bottom: 0; }
.filters { display: grid; grid-template-columns: 2fr 1fr 1fr auto; gap: 16px; align-items: end; padding: 24px; background: var(--cp-surface); border: 1px solid var(--cp-border); border-radius: 16px; }
label { display: block; font-size: .875rem; font-weight: 600; margin-bottom: 8px; }
input, select { display: block; width: 100%; min-width: 0; padding: .65rem .75rem; border: 1px solid var(--cp-border-strong); border-radius: .625rem; color: var(--cp-text); background: var(--cp-bg-elevated); }
.filters > div { min-width: 0; }
#result-count { font-size: .9rem; color: var(--cp-text-muted); margin-block: 20px; }
.topic { margin-bottom: 16px; border: 1px solid var(--cp-border); border-radius: 16px; background: var(--cp-surface); overflow: clip; }
.topic summary { padding: 20px 24px; }
.topic summary h3 { display: inline; font-size: 1.15rem; }
.topic-count { color: var(--cp-text-muted); margin-left: 12px; font-size: .875rem; }
.topic-description { margin: 0; padding: 0 24px 16px; color: var(--cp-text-muted); }
.exercise-list { padding: 0 24px 24px; display: grid; gap: 16px; }
.exercise { border: 1px solid var(--cp-border); border-radius: .625rem; padding: 20px; background: var(--cp-bg-elevated); overflow-wrap: anywhere; }
.exercise-header { display: flex; align-items: start; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.level { border: 1px solid var(--cp-border-strong); border-radius: .625rem; padding: 2px 8px; color: var(--cp-text-muted); font-size: .75rem; font-weight: 650; }
.exercise p { white-space: pre-line; }
.exercise-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.revealed { border-left: 3px solid var(--cp-accent); padding: 12px 16px; margin-top: 16px; background: var(--cp-accent-soft); }
.revealed > :first-child { margin-top: 0; }
.revealed > :last-child { margin-bottom: 0; }
.revealed li + li { margin-top: 8px; }
.notice { padding: 24px; border: 1px solid var(--cp-border-strong); border-radius: .625rem; background: var(--cp-surface); }
.learning-note { border-top: 1px solid var(--cp-border); padding-block: 32px; max-width: 760px; }
footer { padding-block: 24px 40px; font-size: .85rem; border-top: 1px solid var(--cp-border); }
.skip-link { position: absolute; top: 8px; left: 8px; transform: translateY(-200%); background: var(--cp-surface); padding: 12px; z-index: 2; }
.skip-link:focus { transform: none; }
table { border-collapse: collapse; width: 100%; margin-block: 16px; }
caption { text-align: left; font-weight: 650; }
th, td { text-align: left; border-bottom: 1px solid var(--cp-border); padding: 8px; }
.chart-bars { padding: 12px; background: var(--cp-surface-soft); border-radius: .625rem; }
.chart-row { display: grid; grid-template-columns: 6rem 1fr 3rem; align-items: center; gap: 8px; margin-block: 8px; }
.chart-bar { display: block; height: 16px; background: var(--cp-accent); border-radius: 4px; }
#print-view { display: none; }
@media (max-width: 900px) { .filters { grid-template-columns: 1fr 1fr; } .search-field { grid-column: 1 / -1; } }
@media (max-width: 480px) {
  .site-header, main, footer { padding-inline: 16px; }
  .header-note { display: none; }
  .hero { padding-top: 36px; }
  .filters { grid-template-columns: 1fr; padding: 16px; }
  .topic summary, .exercise-list { padding-inline: 16px; }
  .exercise { padding: 16px; }
  .topic-count { display: block; margin-left: 16px; }
}
@page { size: A4; margin: 18mm; }
@media print {
  :root, html[data-theme="dark"] { color-scheme: light; --cp-bg: #ffffff; --cp-text: #242424; --cp-border: #919191; --cp-accent: #242424; }
  body { background: var(--cp-bg); color: var(--cp-text); font-size: 11pt; }
  #screen-view { display: none !important; }
  #print-view { display: block; }
  #print-view h1 { font-size: 20pt; }
  #print-view h2 { font-size: 14pt; }
  .print-exercise { break-inside: avoid; border-bottom: 1px solid var(--cp-border); padding-block: 12px 24px; }
  .print-exercise p { white-space: pre-line; }
  .answer-space { min-height: 28mm; }
}