/* Business math pages: solver, worked examples, worksheet, hub, cheat sheet.
   Mobile-first; desktop gets a two-column solver. Print rules at the end
   strip site chrome so worksheets and the cheat sheet print cleanly. */

.learning-header .learning-byline {
  max-width: 72ch;
}

/* Topic page switcher (Solver / Worked examples / Worksheet / All topics) */
.topic-nav {
  margin: var(--space-4) 0 var(--space-5);
}

.topic-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.topic-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-target-min);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
}

.topic-nav__link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.topic-nav__link:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.topic-nav__link--current {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-contrast);
}

.topic-nav__link--hub {
  border-style: dashed;
}

/* Solver card */
.solver-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
  padding: var(--space-4);
  margin-bottom: var(--space-7);
  display: grid;
  gap: var(--space-5);
  min-width: 0;
}

.solver-card__inputs,
.solver-output {
  min-width: 0;
}

.solver-form .field {
  margin-bottom: var(--space-4);
}

.solver-form .field[hidden] {
  display: none;
}

.solver-form input,
.answer-check input {
  width: 100%;
}

.answer-check {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
}

.answer-check h2,
.solver-output h2 {
  font-size: var(--font-size-h3);
  margin: 0 0 var(--space-2);
}

.answer-check__form {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
  align-items: end;
}

.answer-check__result {
  margin: var(--space-3) 0 0;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  border-left-width: 4px;
  background: var(--color-bg);
  line-height: var(--line-height-base);
}

.answer-check__result[data-status="correct"] {
  border-color: rgba(22, 163, 74, 0.35);
  border-left-color: var(--color-success);
  background: var(--color-success-bg);
}

.answer-check__result[data-status="rounding"] {
  border-color: rgba(217, 119, 6, 0.35);
  border-left-color: var(--color-warning);
  background: var(--color-warning-bg);
}

.answer-check__result[data-status="incorrect"],
.answer-check__result[data-status="invalid"] {
  border-color: rgba(220, 38, 38, 0.3);
  border-left-color: var(--color-danger);
  background: var(--color-danger-bg);
}

.solver-question {
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--space-3);
  overflow-wrap: anywhere;
}

.solver-answer {
  border: 1px solid rgba(15, 118, 110, 0.28);
  border-radius: var(--radius-md);
  background: var(--color-accent-bg);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-4);
}

.solver-answer__label {
  margin: 0;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-accent-strong);
}

.solver-answer__value {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.solver-answer__details {
  margin: var(--space-2) 0 0;
  display: grid;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
}

.solver-answer__details div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0 var(--space-3);
}

.solver-answer__details dt {
  color: var(--color-text-muted);
}

.solver-answer__details dd {
  margin: 0;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

@media (min-width: 960px) {
  .solver-card {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-6);
    padding: var(--space-5);
    align-items: start;
  }

  .solver-output {
    border-left: 1px solid var(--color-border);
    padding-left: var(--space-6);
  }
}

@media (min-width: 480px) {
  .answer-check__form {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .answer-check__form .field {
    margin: 0;
  }
}

/* Step list (server-rendered and live) */
.solution-steps {
  list-style: none;
  counter-reset: solution-step;
  margin: 0 0 var(--space-4);
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.solution-step {
  counter-increment: solution-step;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  min-width: 0;
}

.solution-step__title {
  margin: 0 0 var(--space-1);
  font-weight: 700;
  color: var(--color-text);
}

.solution-step__title::before {
  content: "Step " counter(solution-step) ": ";
  color: var(--color-primary);
}

.solution-step__lines {
  list-style: none;
  margin: 0;
  padding: 0;
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
}

.solution-step__lines li {
  margin: 0;
  padding: 2px 0;
  overflow-wrap: anywhere;
}

/* Worked examples */
.problem-index ol {
  padding-left: var(--space-5);
}

.level-tag {
  display: inline-block;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  white-space: nowrap;
  vertical-align: middle;
}

.worked-problem {
  max-width: 80ch;
  margin: 0 0 var(--space-6);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 80px;
}

.worked-problem__eyebrow {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-subtle);
  font-weight: 600;
}

.worked-problem__title {
  font-size: var(--font-size-h3);
  margin: var(--space-1) 0 var(--space-3);
}

.worked-problem__statement {
  margin: 0 0 var(--space-3);
  line-height: var(--line-height-base);
}

.worked-problem__given {
  display: grid;
  gap: var(--space-1);
  margin: 0 0 var(--space-4);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  font-size: var(--font-size-sm);
}

.worked-problem__given div {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-2);
}

.worked-problem__given dt {
  font-weight: 700;
}

.worked-problem__given dt::after {
  content: ":";
}

.worked-problem__given dd {
  margin: 0;
}

.worked-problem__solution-heading {
  font-size: var(--font-size-lg);
  margin: 0 0 var(--space-2);
}

.worked-problem__part {
  font-size: var(--font-size-base);
  margin: var(--space-3) 0 var(--space-2);
}

.worked-problem__answer {
  margin: var(--space-3) 0 0;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-accent-bg);
  border: 1px solid rgba(15, 118, 110, 0.28);
}

.worked-problem__try {
  margin: var(--space-3) 0 0;
  font-size: var(--font-size-sm);
}

.worked-problem a,
.practice-next a,
.course-outline a,
.cheat-sheet a,
.answer-key a {
  color: var(--color-primary);
  font-weight: 600;
}

/* Worksheet and cheat sheet */
.worksheet-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.worksheet-toolbar .field-hint {
  flex: 1 1 16rem;
}

.worksheet {
  max-width: 80ch;
  margin-bottom: var(--space-6);
}

.worksheet__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-2) var(--space-5);
}

.worksheet__head h2 {
  font-size: var(--font-size-h3);
  margin: 0;
}

.worksheet__fields {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin: 0;
  color: var(--color-text-muted);
}

.worksheet__instructions {
  color: var(--color-text-muted);
}

.worksheet__problems,
.answer-key__list {
  padding-left: var(--space-5);
}

.worksheet__problem {
  margin-bottom: var(--space-4);
  line-height: var(--line-height-base);
}

.worksheet__problem p {
  margin: 0;
}

.worksheet__work {
  min-height: 4.5rem;
  border-bottom: 1px dashed var(--color-border-strong);
}

.answer-key {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.answer-key h2 {
  font-size: var(--font-size-h3);
  margin-top: 0;
}

.answer-key__list li {
  margin-bottom: var(--space-2);
}

.answer-key__note,
.answer-key__source {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.cheat-sheet {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

@media (min-width: 1024px) {
  .cheat-sheet {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.cheat-sheet__section {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  min-width: 0;
}

.cheat-sheet__section h2 {
  font-size: var(--font-size-lg);
  margin: 0 0 var(--space-3);
}

.formula-list {
  margin: 0;
  display: grid;
  gap: var(--space-3);
}

.formula-list dt {
  font-weight: 700;
  font-size: var(--font-size-sm);
}

.formula-list dd {
  margin: 0;
  display: grid;
  gap: 2px;
}

.formula-list__formula {
  overflow-wrap: anywhere;
}

.formula-list__example {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.formula-list__example::before {
  content: "Example: ";
  font-weight: 600;
}

.cheat-sheet__note,
.cheat-sheet__links {
  margin: var(--space-3) 0 0;
  font-size: var(--font-size-sm);
}

/* Hub */
.topic-model li {
  margin-bottom: var(--space-3);
}

.course-outline {
  max-width: 80ch;
  margin-bottom: var(--space-6);
}

.course-outline h2 {
  font-size: var(--font-size-h3);
}

.course-outline__list {
  margin: var(--space-4) 0 0;
  padding-left: var(--space-5);
  display: grid;
  gap: var(--space-3);
}

.course-outline__item {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.course-outline__item--ready {
  border-left: 4px solid var(--color-accent);
}

.course-outline__title {
  font-size: var(--font-size-base);
  margin: 0;
}

.course-outline__covers,
.course-outline__tools {
  margin: var(--space-1) 0 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.course-outline__links {
  margin: var(--space-2) 0 0;
  padding-left: var(--space-5);
}

.course-outline__links li {
  margin-bottom: var(--space-1);
}

.table-wrapper--wrap th,
.table-wrapper--wrap td {
  white-space: normal;
  min-width: 8rem;
  vertical-align: top;
}

/* Homepage "learn business math" block */
.home-learn__grid {
  display: grid;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .home-learn__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Print: worksheet, answer key and cheat sheet only */
@page {
  margin: 0.6in;
}

@media print {
  .worksheet__problems,
  .answer-key__list {
    padding-left: 2.25rem;
  }

  .site-header,
  .site-footer,
  .skip-link,
  .breadcrumbs,
  .topic-nav,
  .learning-byline,
  .learning-related,
  .noscript-banner,
  .screen-only {
    display: none !important;
  }

  body,
  main {
    background: #fff;
    color: #000;
  }

  main {
    max-width: none;
    padding: 0;
  }

  .learning-header h1 {
    font-size: 18pt;
    margin: 0 0 8pt;
  }

  .worksheet,
  .answer-key,
  .cheat-sheet__section {
    max-width: none;
    border: 0;
    box-shadow: none;
    padding: 0;
  }

  .worksheet__problem {
    break-inside: avoid;
  }

  .worksheet__work {
    min-height: 1.1in;
  }

  .answer-key {
    break-before: page;
  }

  .cheat-sheet {
    display: block;
    columns: 2;
    column-gap: 0.35in;
    font-size: 8.5pt;
    line-height: 1.35;
  }

  .cheat-sheet .formula-list {
    gap: 4pt;
  }

  .cheat-sheet__section h2 {
    font-size: 11pt;
    margin-bottom: 4pt;
  }

  .formula-list dt,
  .formula-list__example {
    font-size: 8.5pt;
  }

  .cheat-sheet__section {
    break-inside: avoid;
    margin-bottom: 10pt;
    border-top: 1px solid #000;
    border-radius: 0;
    padding-top: 6pt;
  }

  .level-tag {
    border-color: #000;
    color: #000;
  }
}