@import url('./lesson.css');

.skip-link:not(:focus) { clip-path: inset(50%); }
.rail-lesson-inactive { background: transparent; color: var(--color-muted); font-weight: 400; }
.rail-lesson-inactive:hover { background: var(--color-surface); color: var(--color-ink); }
.other-lesson { display: block; padding: 12px 0 16px; font-size: 16px; text-decoration: none; }
.other-lesson:hover { text-decoration: underline; }
.filter-content { max-width: 1256px; }
.filter-intro { max-width: 65ch; margin-top: 12px; color: var(--color-muted); }
.filter-intro strong { color: var(--color-ink); font-weight: 500; }
.filter-canvas { margin-top: 24px; }
.filter-flow { display: grid; grid-template-columns: minmax(0, 1fr) 20px minmax(180px, .9fr) 20px minmax(0, 1fr); align-items: center; gap: 12px; padding: 32px 24px 28px; }
.flow-stage { min-width: 0; text-align: center; }
.flow-stage h3 { font-size: 16px; font-weight: 500; letter-spacing: 0; margin-bottom: 20px; }
.number-list { display: flex; flex-wrap: wrap; justify-content: center; align-content: center; gap: 8px; min-height: 100px; }
.value-tile { display: inline-flex; justify-content: center; align-items: center; flex-shrink: 0; width: 44px; height: 44px; border: 1px solid var(--color-line-strong); border-radius: 7px; font: 500 21px/1 var(--font-mono); background: white; }
.value-tile.is-current { outline: 2px solid var(--color-and); outline-offset: 3px; }
.value-tile.was-skipped { border-style: dashed; color: var(--color-muted); }
.kept-list .value-tile { background: var(--color-success-soft); border-color: #a5cabc; color: var(--color-success); }
.flow-caption { font-size: 16px; line-height: 1.5; color: var(--color-muted); margin-top: 16px; }
.flow-arrow { color: var(--color-line-strong); }
.rule-control { display: flex; justify-content: center; align-items: center; gap: 7px; min-height: 100px; border-top: 1px solid #b5ccdf; border-bottom: 1px solid #b5ccdf; color: var(--color-and); background: var(--color-and-soft); font-size: 16px; }
.rule-control select { font: 500 20px/1.4 var(--font-mono); min-height: 44px; border: 1px solid #779bb8; border-radius: 6px; background: white; color: var(--color-and); padding: 6px; }
.empty-matches { align-self: center; color: var(--color-muted); font: 22px/1.5 var(--font-mono); }
.filter-decision { min-height: 77px; display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 8px 16px; padding: 18px 24px; border-top: 1px solid var(--color-line); text-align: center; font-size: 16px; }
.decision-question { font: 500 20px/1.5 var(--font-mono); }
.decision-answer { display: flex; align-items: center; gap: 10px; }
.decision-answer code { font-weight: 500; }
.decision-action { color: var(--color-muted); }
.filter-controls { background: var(--color-surface); border-radius: 0 0 10px 10px; }
.filter-takeaway { display: flex; gap: 12px; margin-top: 20px; font-size: 16px; }
.filter-takeaway > .icon { color: var(--color-success); margin-top: 4px; }
.filter-python-section { border-top: 1px solid var(--color-line); padding-top: 40px; margin-top: 48px; }
.filter-signature { margin: 28px 0 32px; padding: 24px; background: var(--color-surface); text-align: center; border-radius: 8px; }
.filter-signature > code { font-size: 30px; letter-spacing: -.04em; }
.rule-code { color: var(--color-and); }
.items-code { text-decoration: underline; text-decoration-color: var(--color-line-strong); text-underline-offset: 5px; }
.signature-labels { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px 24px; font-size: 16px; margin-top: 12px; color: var(--color-muted); }
.signature-labels span:first-child { color: var(--color-and); }
.signature-labels span::before { content: '↳ '; }
.example-intro { margin: 16px 0; }
.code-walkthrough { counter-reset: code-step; list-style: none; margin: 0; padding: 0; }
.code-walkthrough li { counter-increment: code-step; display: grid; grid-template-columns: minmax(220px, .9fr) minmax(0, 1.25fr); align-items: center; gap: 28px; border-top: 1px solid var(--color-line); padding: 28px 0; }
.code-explanation { position: relative; padding-left: 36px; }
.code-explanation::before { content: counter(code-step); position: absolute; top: 1px; left: 0; width: 24px; height: 24px; border: 1px solid var(--color-line-strong); border-radius: 50%; text-align: center; font-size: 14px; line-height: 22px; }
.code-explanation h3 { font-size: 18px; letter-spacing: -.015em; }
.code-explanation p { margin-top: 8px; color: var(--color-muted); font-size: 16px; }
.code-walkthrough pre { margin: 0; padding: 18px 20px; border-left: 2px solid var(--color-line); background: var(--color-surface); white-space: pre-wrap; overflow-wrap: anywhere; font: 16px/1.9 var(--font-mono); min-width: 0; }
.python-keyword { font-weight: 600; }
.code-output { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 24px; padding: 20px 24px; border-left: 2px solid var(--color-success); background: var(--color-success-soft); font-size: 16px; }
.code-output > code { color: var(--color-success); font-size: 24px; white-space: nowrap; }
.code-output p { margin-left: auto; color: var(--color-muted); }
.code-output strong { color: var(--color-ink); font-weight: 500; }
.function-tip { margin-top: 24px; font-size: 16px; }
.filter-detail { margin-top: 16px; font-size: 16px; }
.filter-detail summary { width: fit-content; min-height: 44px; padding: 8px 0; cursor: pointer; }
.filter-detail p { color: var(--color-muted); max-width: 65ch; padding: 8px 0 16px; }
.filter-ready { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-top: 40px; padding-top: 32px; border-top: 1px solid var(--color-line); }
.filter-ready p { margin-top: 8px; font-size: 16px; color: var(--color-muted); }
.filter-ready .button { flex-shrink: 0; }
.filter-practice .section-heading { align-items: baseline; }
.filter-practice #question-count { white-space: nowrap; font-size: 16px; }
.filter-practice-body { display: flex; flex-direction: column; align-items: center; gap: 28px; padding: 32px; min-height: 320px; }
.question-example { text-align: center; font: 20px/1.8 var(--font-mono); max-width: 100%; overflow-wrap: anywhere; }
.question-example p { font: 16px/1.6 var(--font-sans); margin-top: 12px; color: var(--color-muted); }
.filter-answer-options { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; width: 100%; }
.filter-answer-options .value-tile { position: relative; width: 56px; height: 56px; }
.filter-answer-options .value-tile[aria-pressed='true'] { border: 2px solid var(--color-success); background: var(--color-success-soft); color: var(--color-success); }
.selection-mark { position: absolute; top: -9px; right: -7px; border-radius: 50%; width: 20px; height: 20px; font: 14px/20px var(--font-sans); background: var(--color-success); color: white; }
.filter-answer-options.is-choices { flex-direction: column; align-items: stretch; max-width: 500px; }
.filter-answer-options .button { text-align: left; justify-content: flex-start; }
.filter-answer-options .button[aria-pressed='true'] { border: 2px solid var(--color-ink); background: var(--color-surface); }
.filter-answer-options .button.wrong { border-color: var(--color-error); }
.filter-practice .practice-feedback { width: 100%; max-width: 600px; font-size: 16px; }
.filter-practice .practice-feedback:empty { min-height: 26px; }
.filter-practice .practice-feedback .feedback { font-size: 16px; }
.filter-practice .canvas-footer { min-height: 78px; }
.filter-practice .feedback-result { display: block; margin-top: 12px; font: 500 24px/1.5 var(--font-mono); }
.completion-filter { display: block; margin: 0 0 32px; font-size: 24px; overflow-wrap: anywhere; }
.next-filter-lesson { margin-top: 20px; }
.filter-completion-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-bottom: 12px; }

@media (min-width: 1450px) { .filter-flow { padding: 40px 32px; gap: 16px; } }
@media (max-width: 1200px) and (min-width: 901px) { .filter-flow { padding-left: 16px; padding-right: 16px; gap: 8px; grid-template-columns: minmax(0, 1fr) 16px 180px 16px minmax(0, 1fr); } .flow-arrow { width: 16px; } }
@media (max-width: 1100px) { .code-walkthrough li { grid-template-columns: 1fr; gap: 16px; } .code-walkthrough pre { margin-left: 36px; } }
@media (max-width: 700px) {
  .filter-flow { grid-template-columns: 1fr; gap: 16px; padding: 24px 16px; }
  .flow-stage h3 { margin-bottom: 12px; }
  .number-list { min-height: 44px; gap: 7px; }
  .value-tile { width: 38px; height: 42px; font-size: 20px; }
  .flow-caption { margin-top: 10px; }
  .flow-arrow { transform: rotate(90deg); justify-self: center; }
  .rule-control { min-height: 66px; max-width: 280px; margin: 0 auto; }
  .filter-decision { padding: 16px; gap: 8px 12px; }
  .filter-controls { flex-wrap: wrap; }
  .filter-controls .step-actions { margin-left: auto; }
  .filter-controls .step-indicator { font-size: 14px; }
  .filter-controls .button { padding-left: 12px; padding-right: 12px; }
  .filter-controls .icon-button { flex-shrink: 0; }
  .filter-python-section { margin-top: 36px; padding-top: 32px; }
  .filter-signature { padding: 20px 12px; }
  .filter-signature > code { font-size: 25px; }
  .signature-labels { flex-direction: column; gap: 4px; }
  .code-walkthrough li { padding: 24px 0; }
  .code-walkthrough pre { margin-left: 0; padding: 16px 12px; font-size: 15px; }
  .code-output { padding: 16px; }
  .code-output p { width: 100%; margin-left: 0; }
  .filter-ready { flex-direction: column; align-items: flex-start; }
  .filter-practice-body { padding: 28px 16px; }
  .filter-answer-options { gap: 10px; }
  .filter-answer-options .value-tile { width: 56px; height: 56px; }
  .filter-answer-options:not(.is-choices) { max-width: 220px; }
  .question-example { font-size: 18px; }
  .completion-filter { font-size: 20px; }
  .filter-content .lesson-footer { align-items: flex-start; flex-wrap: wrap; gap: 8px; }
}
@media (max-width: 374px) { .number-list { gap: 5px; } .value-tile { width: 34px; height: 40px; } .filter-controls { justify-content: center; } .filter-controls .step-actions { margin-left: 0; } .filter-signature > code { font-size: 22px; } }