/* Functional Programming in Scala
   Scoped lesson skin: technical field guide + browser lab. */

body.fp-scala-page {
  --fp-bg: #f4f7f5;
  --fp-ink: #17221e;
  --fp-muted: #5d6b65;
  --fp-faint: #819089;
  --fp-accent: #087f68;
  --fp-accent-dark: #05624f;
  --fp-accent-soft: #e3f3ed;
  --fp-line: #d5e0db;
  --fp-code-bg: #17231f;
  --fp-code-line: #2a4037;
  --fp-lab-bg: #ffffff;
  --fp-lab-line: #d5e0db;
  --fp-lab-text: #17221e;
  --fp-lab-muted: #5d6b65;
  --bg: var(--fp-bg);
  --fg: var(--fp-ink);
  --muted: var(--fp-muted);
  --faint: var(--fp-faint);
  --accent: var(--fp-accent);
  --accent-light: var(--fp-accent-soft);
  --accent-dim: #76b9a8;
  --border: var(--fp-line);
  --code-bg: var(--fp-code-bg);
  --code-border: var(--fp-code-line);
  --card-bg: #ffffff;
  background: var(--fp-bg);
  color: var(--fp-ink);
}

body.fp-scala-page .container {
  max-width: 820px;
  padding: 2.75rem 1.25rem 4rem;
}

body.fp-scala-page header.lesson-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom-color: var(--fp-line);
}

body.fp-scala-page .lesson-number {
  color: var(--fp-accent);
  font-weight: 700;
  letter-spacing: 0.14em;
}

body.fp-scala-page h1,
body.fp-scala-page h2,
body.fp-scala-page h3 {
  font-family: var(--sans);
  color: var(--fp-ink);
  letter-spacing: -0.015em;
}

body.fp-scala-page h1 {
  max-width: 15ch;
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
}

body.fp-scala-page .subtitle {
  max-width: 42rem;
  color: var(--fp-muted);
  font-size: 1rem;
}

body.fp-scala-page h2 {
  margin-top: 2.75rem;
  margin-bottom: 0.75rem;
  font-size: 1.28rem;
  line-height: 1.2;
}

body.fp-scala-page h3 {
  margin: 0.2rem 0 0;
  color: var(--fp-lab-text);
  font-size: 1.15rem;
  line-height: 1.25;
}

body.fp-scala-page a {
  color: var(--fp-accent-dark);
}

body.fp-scala-page code {
  color: #194f42;
  background: #e8efec;
  border-color: #d5e3dd;
}

body.fp-scala-page pre code {
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
}

body.fp-scala-page pre {
  background: var(--fp-code-bg);
  border-color: var(--fp-code-line);
  border-radius: 10px;
  box-shadow: 0 8px 20px rgba(17, 38, 31, 0.08);
}

body.fp-scala-page .callout {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border: 0;
  border-left: 2px solid var(--fp-accent);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

body.fp-scala-page .callout .label,
body.fp-scala-page .callout.tip .label,
body.fp-scala-page .callout.warn .label {
  color: var(--fp-accent);
}

body.fp-scala-page .callout.tip {
  padding: 1rem 1.1rem;
  border: 1px solid #c9e5da;
  border-left: 3px solid var(--fp-accent);
  border-radius: 0 10px 10px 0;
  background: var(--fp-accent-soft);
}

body.fp-scala-page .callout.warn {
  border-left-color: var(--fp-accent);
}

body.fp-scala-page .sidenote {
  border-color: var(--fp-line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.55);
}

/* Browser lab */
body.fp-scala-page .playground {
  margin: 1.5rem 0;
  padding: 1rem;
  border: 1px solid var(--fp-lab-line);
  border-radius: 8px;
  background: var(--fp-lab-bg);
  color: var(--fp-lab-text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

body.fp-scala-page .playground-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 9rem;
  align-items: end;
  gap: 1rem;
  margin-bottom: 0;
  padding-bottom: 1.15rem;
  border-bottom: 1px solid var(--fp-lab-line);
}

body.fp-scala-page .playground-title {
  min-width: 0;
}

body.fp-scala-page .playground-kicker,
body.fp-scala-page .reading-header,
body.fp-scala-page .result-label {
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

body.fp-scala-page .playground-kicker {
  color: var(--fp-accent);
}

body.fp-scala-page .playground-head label,
body.fp-scala-page .reading-row label {
  color: var(--fp-lab-muted);
  line-height: 1.25;
}

body.fp-scala-page .playground-head label {
  min-width: 0;
}

body.fp-scala-page .playground input,
body.fp-scala-page .playground select {
  min-height: 2.6rem;
  min-width: 0;
  color: var(--fp-lab-text);
  border-color: var(--fp-lab-line);
  background: #ffffff;
  border-radius: 5px;
  line-height: 1.3;
}

body.fp-scala-page .playground input:focus,
body.fp-scala-page .playground select:focus {
  outline: 2px solid var(--fp-accent);
  outline-offset: 1px;
  border-color: var(--fp-accent);
}

body.fp-scala-page .reading-header,
body.fp-scala-page .reading-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 7rem 4.6rem;
  gap: 0.6rem;
}

body.fp-scala-page .reading-header {
  padding: 1rem 0 0.5rem;
  color: var(--fp-muted);
}

body.fp-scala-page .reading-row {
  align-items: end;
  min-width: 0;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--fp-lab-line);
}

body.fp-scala-page .reading-row label {
  min-width: 0;
}

body.fp-scala-page .playground button {
  min-height: 2.6rem;
  min-width: 0;
  padding: 0.5rem 0.7rem;
  color: var(--fp-lab-text);
  border: 1px solid var(--fp-lab-line);
  border-radius: 5px;
  background: #f8f9fa;
  cursor: pointer;
  line-height: 1.25;
}

body.fp-scala-page .playground button:hover {
  border-color: var(--fp-accent);
  background: var(--fp-accent-soft);
}

body.fp-scala-page .playground button:active,
body.fp-scala-page .quiz .option:active {
  transform: translateY(1px);
}

body.fp-scala-page .playground button.primary {
  color: #ffffff;
  border-color: var(--fp-accent);
  background: var(--fp-accent);
  font-weight: 700;
}

body.fp-scala-page .playground button.primary:hover {
  border-color: var(--fp-accent-dark);
  background: var(--fp-accent-dark);
}

body.fp-scala-page .playground .remove-reading {
  color: var(--fp-muted);
  min-width: 0;
  font-size: 0.76rem;
  white-space: nowrap;
}

body.fp-scala-page .reading-row .remove-reading {
  grid-column: auto;
  justify-self: stretch;
}

body.fp-scala-page .playground-actions {
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--fp-lab-line);
}

body.fp-scala-page .playground-output {
  margin-top: 1rem;
  padding: 0.75rem;
  border-left: 3px solid var(--fp-accent);
  border-radius: 0 5px 5px 0;
  background: #f0fdf4;
  color: var(--fp-ink);
  font-family: var(--sans);
}

body.fp-scala-page .result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

body.fp-scala-page .result-item + .result-item {
  padding-left: 1rem;
  border-left: 1px solid #b8d9cc;
}

body.fp-scala-page .result-label {
  display: block;
  color: #397563;
}

body.fp-scala-page .result-item strong {
  display: block;
  margin-top: 0.25rem;
  font-family: var(--mono);
  font-size: 1.1rem;
  letter-spacing: -0.015em;
  line-height: 1.3;
}

body.fp-scala-page .playground-output [data-purity-note] {
  margin: 1rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid #b8d9cc;
  color: #397563;
  font-size: 0.78rem;
}

body.fp-scala-page .playground-output.error {
  background: #fff0ed;
  border-left: 0;
  color: #6d2d21;
}

body.fp-scala-page .playground-output.error .result-item strong,
body.fp-scala-page .playground-output.error [data-purity-note] {
  color: #8f3f30;
}

/* Higher-order function lab */
body.fp-scala-page .hof-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 0.75rem;
  margin-top: 1rem;
}

body.fp-scala-page .hof-controls label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
  color: var(--fp-lab-muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.25;
}

body.fp-scala-page .hof-controls input {
  min-width: 0;
  min-height: 2.6rem;
  padding: 0.5rem 0.55rem;
  color: var(--fp-lab-text);
  border: 1px solid var(--fp-lab-line);
  border-radius: 5px;
  background: #ffffff;
  font-family: var(--mono);
  font-size: 0.84rem;
}

body.fp-scala-page .hof-controls input:focus {
  outline: 2px solid var(--fp-accent);
  outline-offset: 1px;
  border-color: var(--fp-accent);
}

body.fp-scala-page .hof-output {
  margin-top: 1rem;
  padding: 0.85rem;
  border-left: 3px solid var(--fp-accent);
  border-radius: 0 6px 6px 0;
  background: #f0fdf4;
  color: var(--fp-ink);
  font-family: var(--sans);
}

body.fp-scala-page .hof-output.error {
  border-left-color: #c55d48;
  background: #fff0ed;
  color: #6d2d21;
}

body.fp-scala-page .hof-result-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

body.fp-scala-page .hof-result-line strong {
  color: var(--fp-accent-dark);
  font-family: var(--mono);
  font-size: 1.05rem;
}

body.fp-scala-page .hof-output p {
  margin: 0.55rem 0 0;
  color: var(--fp-muted);
  font-size: 0.82rem;
}

body.fp-scala-page .hof-trace {
  margin: 0.75rem 0 0;
  padding: 0.7rem;
  border: 1px solid #b8d9cc;
  border-radius: 5px;
  background: #e7f4ed;
  color: #265246;
  box-shadow: none;
  font-size: 0.72rem;
  line-height: 1.55;
}

/* Functional data-structure lab */
body.fp-scala-page .list-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 7rem auto;
  align-items: end;
  gap: 0.75rem;
  margin-top: 1rem;
}

body.fp-scala-page .list-controls label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
  color: var(--fp-lab-muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.25;
}

body.fp-scala-page .list-controls input {
  min-width: 0;
  min-height: 2.6rem;
  padding: 0.5rem 0.55rem;
  color: var(--fp-lab-text);
  border: 1px solid var(--fp-lab-line);
  border-radius: 5px;
  background: #ffffff;
  font-family: var(--mono);
  font-size: 0.84rem;
}

body.fp-scala-page .list-controls input:focus {
  outline: 2px solid var(--fp-accent);
  outline-offset: 1px;
  border-color: var(--fp-accent);
}

body.fp-scala-page .list-output {
  margin-top: 1rem;
  padding: 0.85rem;
  border-left: 3px solid var(--fp-accent);
  border-radius: 0 6px 6px 0;
  background: #f0fdf4;
  color: var(--fp-ink);
  font-family: var(--sans);
}

body.fp-scala-page .list-output.error {
  border-left-color: #c55d48;
  background: #fff0ed;
  color: #6d2d21;
}

body.fp-scala-page .list-result-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

body.fp-scala-page .list-result-line strong {
  max-width: 100%;
  color: var(--fp-accent-dark);
  font-family: var(--mono);
  font-size: 1.05rem;
  line-height: 1.4;
  overflow-wrap: anywhere;
  text-align: right;
}

body.fp-scala-page .list-output > p {
  margin: 0.55rem 0 0;
  color: var(--fp-muted);
  font-size: 0.82rem;
  overflow-wrap: anywhere;
}

body.fp-scala-page .list-trace {
  margin: 0.75rem 0 0;
  padding: 0.7rem;
  border: 1px solid #b8d9cc;
  border-radius: 5px;
  background: #e7f4ed;
  color: #265246;
  box-shadow: none;
  font-size: 0.72rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

/* Readable answer cards instead of a clipped code table */
body.fp-scala-page .quiz {
  padding: 1.25rem;
  border: 1px solid var(--fp-line);
  border-radius: 12px;
  background: #ffffff;
  box-shadow: 0 8px 20px rgba(17, 38, 31, 0.05);
}

body.fp-scala-page .quiz .question {
  margin-bottom: 1rem;
  color: var(--fp-ink);
  font-size: 1rem;
}

body.fp-scala-page .quiz .options {
  gap: 0.55rem;
}

body.fp-scala-page .quiz .option {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  align-items: center;
  width: 100%;
  min-height: 3.2rem;
  gap: 0.75rem;
  padding: 0.65rem 0.8rem;
  color: var(--fp-ink);
  border: 1px solid var(--fp-line);
  border-radius: 8px;
  background: #f7faf8;
  text-align: left;
}

body.fp-scala-page .quiz .option:hover {
  border-color: var(--fp-accent);
  background: var(--fp-accent-soft);
}

body.fp-scala-page .quiz .option code {
  min-width: 0;
  padding: 0;
  color: #29453b;
  border: 0;
  background: transparent;
  font-size: 0.78rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
  white-space: normal;
}

body.fp-scala-page .quiz-key {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 6px;
  color: var(--fp-accent-dark);
  background: #d6eee5;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
}

body.fp-scala-page .quiz .option.correct {
  border-color: var(--fp-accent);
  background: var(--fp-accent-soft);
}

body.fp-scala-page .quiz .option.wrong {
  border-color: #d38a78;
  background: #fff0ed;
}

body.fp-scala-page .quiz .feedback {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--fp-line);
}

body.fp-scala-page footer.lesson-footer {
  border-top-color: var(--fp-line);
}

@media (max-width: 480px) {
  body.fp-scala-page .container {
    padding: 1.5rem 0.85rem 3rem;
  }

  body.fp-scala-page header.lesson-header {
    margin-bottom: 2rem;
  }

  body.fp-scala-page h1 {
    font-size: 2rem;
  }

  body.fp-scala-page .playground {
    padding: 1rem;
    border-radius: 12px;
  }

  body.fp-scala-page .playground-head {
    grid-template-columns: 1fr;
    align-items: stretch;
    gap: 0.75rem;
  }

  body.fp-scala-page .playground-head label {
    flex-basis: auto;
  }

  body.fp-scala-page .reading-header {
    display: none;
  }

  body.fp-scala-page .reading-row {
    grid-template-columns: minmax(0, 1fr) 5.25rem auto;
    gap: 0.4rem;
    padding: 0.8rem 0;
  }

  body.fp-scala-page .reading-row label {
    font-size: 0.66rem;
  }

  body.fp-scala-page .playground .remove-reading {
    padding-inline: 0.45rem;
    font-size: 0.7rem;
  }

  body.fp-scala-page .result-grid {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  body.fp-scala-page .result-item + .result-item {
    padding-top: 0.8rem;
    padding-left: 0;
    border-top: 1px solid #b8d9cc;
    border-left: 0;
  }

  body.fp-scala-page .hof-controls {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  body.fp-scala-page .list-controls {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  body.fp-scala-page .hof-result-line {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }

  body.fp-scala-page .list-result-line {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }

  body.fp-scala-page .list-result-line strong {
    text-align: left;
  }

  body.fp-scala-page .table-wrap {
    overflow-x: visible;
  }

  body.fp-scala-page .type-table {
    display: block;
    min-width: 0;
    font-size: 0.82rem;
  }

  body.fp-scala-page .type-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  body.fp-scala-page .type-table tbody {
    display: grid;
    gap: 0.65rem;
  }

  body.fp-scala-page .type-table tr {
    display: grid;
    gap: 0.2rem;
    padding: 0.7rem 0.75rem;
    border: 1px solid var(--fp-line);
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.6);
  }

  body.fp-scala-page .type-table td {
    display: grid;
    grid-template-columns: 7.2rem minmax(0, 1fr);
    gap: 0.55rem;
    padding: 0.25rem 0;
    border-bottom: 0;
  }

  body.fp-scala-page .type-table td::before {
    content: attr(data-label);
    color: var(--fp-muted);
    font-family: var(--sans);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    line-height: 1.35;
    text-transform: uppercase;
  }

  body.fp-scala-page .type-table td code {
    min-width: 0;
    overflow-wrap: anywhere;
  }
}