/* learn.css — Socratii learn library page styles (uses tokens from style.css) */

/* ============ PAGE INTRO ============ */
.learn-hero {
  padding-block: clamp(var(--space-12), 7vw, var(--space-20)) var(--space-10);
  border-bottom: 1px solid var(--color-divider);
}
.learn-hero-copy h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-top: var(--space-3);
}
.learn-hero-copy p {
  margin-top: var(--space-5);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 74ch;
}
.learn-hero-copy p strong {
  color: var(--color-text);
}

/* ============ JUMP NAV (mirrors .calc-jumpnav) ============ */
.learn-jumpnav {
  margin-top: var(--space-8);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.learn-jumpnav-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-right: var(--space-1);
}
.learn-jumpnav a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}
.learn-jumpnav a:hover {
  text-decoration: underline;
  background: var(--color-surface-offset);
}
.learn-jumpnav span[aria-hidden] {
  color: var(--color-text-faint);
}
.learn-jumpnav-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  background: var(--color-gold);
}

/* ============ CATEGORY SECTIONS ============ */
.learn-category {
  border-bottom: 1px solid var(--color-divider);
  scroll-margin-top: var(--space-20);
}
.learn-category--alt {
  background: var(--color-surface-2);
}
.learn-category:last-of-type {
  border-bottom: none;
}

.learn-category-head {
  max-width: 720px;
  margin-bottom: var(--space-10);
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}
.learn-category-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  margin-top: var(--space-1);
}
.learn-category-icon svg {
  width: 24px;
  height: 24px;
}
.learn-category-head-copy .eyebrow {
  margin-bottom: var(--space-1);
}
.learn-category-head h2 {
  font-size: var(--text-xl);
  font-weight: 700;
}
.learn-category-head p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* ============ SUBCATEGORY CARD GRID ============ */
.subtopic-grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}
@media (min-width: 560px) {
  .subtopic-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1080px) {
  .subtopic-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.subtopic-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  transition:
    box-shadow var(--transition-interactive),
    transform var(--transition-interactive),
    border-color var(--transition-interactive);
}
.subtopic-card:hover,
.subtopic-card:has(.lesson-summary:focus-visible) {
  box-shadow: var(--shadow-md);
  border-color: oklch(from var(--color-primary) l c h / 0.3);
  transform: translateY(-2px);
}

.subtopic-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.subtopic-card h3 {
  font-size: var(--text-base);
  font-weight: 700;
}
.subtopic-status {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-gold);
  background: var(--color-gold-highlight);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  white-space: nowrap;
}
.subtopic-card p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ============ LESSON ACCORDION (details/summary disclosure) ============ */
.lesson-disclosure {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* The <summary> reuses .subtopic-card-top layout but needs button-like
   semantics: full width, no default marker, keyboard-focusable. */
.lesson-summary {
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
  border-radius: var(--radius-sm);
}
.lesson-summary::-webkit-details-marker {
  display: none;
}
.lesson-summary::marker {
  content: '';
}

.lesson-toggle-affordance {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  white-space: nowrap;
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive);
}
.lesson-toggle-icon {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-interactive);
}
.lesson-disclosure[open] > .lesson-summary .lesson-toggle-icon {
  transform: rotate(180deg);
}
.lesson-disclosure[open] > .lesson-summary .lesson-toggle-affordance {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.lesson-summary:hover .lesson-toggle-affordance {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* Smooth expand/collapse via grid-template-rows trick (no JS needed,
   works with native <details>/<summary> because the row track only
   needs the [open] attribute as a hook). */
.lesson-panel {
  display: grid;
  grid-template-rows: 0fr;
  overflow: hidden;
  transition: grid-template-rows 320ms var(--ease-out-expo);
}
.lesson-disclosure[open] > .lesson-panel {
  grid-template-rows: 1fr;
}
.lesson-panel-inner {
  min-height: 0;
  overflow: hidden;
}
.lesson-disclosure[open] > .lesson-panel .lesson-panel-inner {
  overflow: visible;
}

.lesson-body {
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
  margin-top: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.lesson-body p {
  color: var(--color-text);
  font-size: var(--text-sm);
  line-height: 1.65;
}

.lesson-takeaways {
  margin-top: var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}
.lesson-takeaways h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}
.lesson-takeaways ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-left: var(--space-5);
}
.lesson-takeaways li {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.55;
  list-style: disc;
}
.lesson-takeaways li::marker {
  color: var(--color-gold);
}

/* ============ CROSS-LINK: "Related calculator" (lesson -> calculator) ============ */
.lesson-relcalcs {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-2);
}
.lesson-relcalcs-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-right: var(--space-1);
  flex-basis: 100%;
}
.lesson-relcalc {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  text-decoration: none;
  max-width: 100%;
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive);
}
.lesson-relcalc-icon {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}
.lesson-relcalc:hover,
.lesson-relcalc:focus-visible {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.lesson-relcalc:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .lesson-panel,
  .lesson-toggle-icon {
    transition: none;
  }
}

/* ============ CATEGORY DIVIDER LABEL (mobile breathing room helper) ============ */
.learn-category .container > .learn-category-head {
  scroll-margin-top: var(--space-20);
}

@media (max-width: 480px) {
  .learn-category-head {
    gap: var(--space-3);
  }
  .learn-category-icon {
    width: 40px;
    height: 40px;
  }
  .learn-category-icon svg {
    width: 20px;
    height: 20px;
  }
  .subtopic-card {
    padding: var(--space-5);
  }
}

/* ============ CLOSING NOTE ============ */
.learn-closing {
  padding-block: clamp(var(--space-10), 6vw, var(--space-16));
}
.learn-closing .container {
  max-width: 760px;
  text-align: center;
}
.learn-closing p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ============ LEARNING LIBRARY: levels, progress, paths, quizzes ============ */
/* An open lesson takes the full row so the text keeps a readable measure. */
.subtopic-card:has(> .lesson-disclosure[open]) {
  grid-column: 1 / -1;
}
.subtopic-card:has(> .lesson-disclosure[open]) .lesson-panel-inner > * {
  max-width: 72ch;
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}
.lesson-level {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius-full);
  padding: 2px var(--space-2);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  color: var(--color-text);
}
.lesson-level--beginner { background: var(--color-success-highlight); border-color: transparent; color: var(--color-success); }
.lesson-level--intermediate { background: var(--color-primary-highlight); border-color: transparent; color: var(--color-primary); }
.lesson-level--advanced { background: var(--color-warning-highlight); border-color: transparent; color: var(--color-warning); }
.lesson-status {
  font-weight: 600;
  color: var(--color-text-muted);
}
.lesson-status.is-complete { color: var(--color-success); }
.lesson-status.is-complete::before { content: '\2713\00a0'; }

.lesson-sources {
  margin-top: var(--space-4);
}
.lesson-sources h4,
.lesson-quiz-head h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.lesson-sources ul { margin-top: var(--space-2); display: grid; gap: var(--space-1); }
.lesson-sources a { font-size: var(--text-sm); color: var(--color-primary); }

.lesson-quiz {
  margin-top: var(--space-5);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
}
.lesson-quiz-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
}
.lesson-quiz-count { font-size: var(--text-xs); color: var(--color-text-muted); }
.lesson-quiz-intro {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.lesson-quiz-start { margin-top: var(--space-4); }
.lesson-quiz-body:not([hidden]) { margin-top: var(--space-4); }
.lesson-quiz-body .quiz-progress-labels { margin-bottom: var(--space-2); }
.lesson-quiz-question {
  margin-top: var(--space-4);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.45;
}
.lesson-quiz-body .quiz-options { margin-top: var(--space-4); }
.lesson-quiz-body .quiz-nav { margin-top: var(--space-5); }
.lesson-quiz-results { padding-block: var(--space-2); }
.lesson-quiz-results .quiz-results-actions { flex-wrap: wrap; justify-content: center; }
.lesson-quiz-error { font-size: var(--text-sm); color: var(--color-error); }

.lesson-footer {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
}
.lesson-mark-read {
  font: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  background: none;
  border: 1px solid oklch(from var(--color-primary) l c h / 0.35);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  cursor: pointer;
  min-height: 36px;
  transition: background var(--transition-interactive), color var(--transition-interactive);
}
.lesson-mark-read:hover { background: var(--color-primary-highlight); }
.lesson-mark-read[aria-pressed='true'] { color: var(--color-success); border-color: oklch(from var(--color-success) l c h / 0.4); }
.lesson-reviewed { font-size: var(--text-xs); color: var(--color-text-muted); }

/* Paths */
.learn-paths {
  padding-block: clamp(var(--space-10), 6vw, var(--space-16));
  border-bottom: 1px solid var(--color-divider);
}
.learn-paths-head h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-top: var(--space-3);
}
.learn-paths-head p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  max-width: 70ch;
}
.learn-progress {
  margin-top: var(--space-4);
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-success-highlight);
  color: var(--color-text);
  font-size: var(--text-sm);
}
.learn-progress[hidden] { display: none; }
.learn-progress-reset {
  font: inherit;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  background: none;
  border: none;
  text-decoration: underline;
  cursor: pointer;
  padding: var(--space-1);
}
.path-grid {
  margin-top: var(--space-8);
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}
@media (min-width: 720px) { .path-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .path-grid { grid-template-columns: repeat(3, 1fr); } }
.path-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.path-card.is-complete { border-color: oklch(from var(--color-success) l c h / 0.45); }
.path-card-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}
.path-card-length { font-size: var(--text-xs); color: var(--color-text-muted); font-variant-numeric: tabular-nums; }
.path-card h3 { font-size: var(--text-lg); font-weight: 700; }
.path-card > p { font-size: var(--text-sm); color: var(--color-text-muted); }
.path-progress { display: grid; gap: var(--space-1); }
.path-progress[hidden] { display: none; }
.path-progress-track { height: 6px; border-radius: var(--radius-full); background: var(--color-surface-2); overflow: hidden; }
.path-progress-fill { height: 100%; width: 0; background: var(--color-success); border-radius: inherit; transition: width 400ms var(--ease-out-expo); }
.path-progress-text { font-size: var(--text-xs); font-weight: 600; color: var(--color-success); }
.path-steps {
  counter-reset: step;
  display: grid;
  gap: var(--space-1);
  margin-top: var(--space-1);
}
.path-steps li {
  counter-increment: step;
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-size: var(--text-sm);
}
.path-steps li::before {
  content: counter(step);
  flex-shrink: 0;
  width: 1.4em;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}
.path-steps li.is-done::before { content: '\2713'; color: var(--color-success); }
.path-steps a { color: var(--color-text); text-decoration: none; }
.path-steps a:hover { color: var(--color-primary); text-decoration: underline; }
.path-steps li.is-done a { color: var(--color-text-muted); }
.path-cta { margin-top: auto; align-self: flex-start; }
@media (prefers-reduced-motion: reduce) { .path-progress-fill { transition: none; } }
.lesson-quiz-results .btn { white-space: normal; text-align: center; max-width: 100%; }
.lesson-quiz-review {
  margin: var(--space-4) auto 0;
  max-width: 60ch;
  display: grid;
  gap: var(--space-3);
  text-align: left;
}
.lesson-quiz-review li {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
}
.lesson-quiz-review p { font-size: var(--text-sm); max-width: none; }
.lesson-quiz-review-q { font-weight: 600; color: var(--color-text); }
.lesson-quiz-review-a { margin-top: var(--space-1); color: var(--color-success); font-weight: 600; }
.lesson-quiz-review-e { margin-top: var(--space-1); color: var(--color-text-muted); }
.lesson-quiz-start[hidden] { display: none; }
.lesson-quiz-results .quiz-results-score { font-size: var(--text-xl); font-weight: 700; line-height: 1.1; font-variant-numeric: tabular-nums; }
/* .subtopic-card p sets muted small text; restore quiz/meta colors inside cards. */
.subtopic-card .quiz-results-score { color: var(--color-primary); }
.subtopic-card .lesson-quiz-question,
.subtopic-card .lesson-quiz-review-q,
.subtopic-card .quiz-feedback p { color: var(--color-text); }
.subtopic-card .lesson-quiz-review-a { color: var(--color-success); }
.subtopic-card .lesson-quiz-error { color: var(--color-error); }