@import url("./colors.css");
/* Color policy: do not use hardcoded color literals in this file.
   Add new semantic tokens in colors.css and reference them via var(--...). */

body {
  font-family: var(--font-family);
  color: var(--color-text-primary);
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: linear-gradient(
    180deg,
    var(--color-page-gradient-start) 0%,
    var(--color-page-gradient-mid) 240px,
    var(--color-page-gradient-end) 100%
  );
}

/* workbook title line */

.workbook-title-line{
    background: linear-gradient(180deg, var(--color-header-gradient-start) 0%, var(--color-header-gradient-end) 100%);
    box-shadow: 0 1px 0 var(--color-shadow-blue-soft);
    margin-bottom: var(--space-xl);

    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);

    position: sticky;
    top: 0;
    padding: 1.25rem 1rem 1rem;
    border-bottom: 1px solid var(--color-border-subtle);
    z-index: 1000;
}

.workbook-title-line .select-language-line{
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-items: center;
    gap: var(--space-md);
}

/* workbook overview */

.section-overview {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
    width: min(100%, 1240px);
}

.section-block {
    flex: 1 1 164px;
    min-height: 72px;
    max-width: 170px;
    padding: 11px 12px;
    text-align: center;
    background: var(--color-button-background);
    border: 2px solid var(--color-button-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
    font-size: 0.85rem;
    line-height: 1.35;
    font-weight: 500;
    color: var(--color-text-secondary);
    box-shadow: 0 1px 0 var(--color-shadow-text-soft);
    display: flex;
    align-items: center;
    justify-content: center;
}

.section-block:hover {
    background: var(--color-surface);
    border-color: var(--color-border-strong);
    transform: translateY(-1px);
    box-shadow: var(--shadow-light);
}

.section-block.active {
    background: linear-gradient(180deg, var(--color-tab-active-start) 0%, var(--color-tab-active-end) 100%);
    color: var(--color-text-inverse);
    border-color: var(--color-tab-active-border);
    font-weight: 600;
    box-shadow: 0 8px 18px -12px var(--color-shadow-blue-strong);
}


/* workbook content */

.container-exercise {
  width: min(100%, 980px);
  margin: 0 auto;
  gap: var(--space-sm);
  background-color: var(--color-container-background);
  box-shadow: var(--shadow-soft);

  border-radius: var(--space-md);
  display: flex;
  flex-direction: column;
  border-top: var(--space-md) solid var(--color-container-border-passive);
  border-bottom: var(--space-md) solid var(--color-container-border-passive);
}

.container-exercise + .container-exercise {
  margin-top: var(--space-xl);
}


.container-exercise.container-level-1 {
  background-color: var(--color-workbook-surface-level-1);
}

.container-exercise.container-level-2,
.container-sub.container-level-2 {
  background-color: var(--color-workbook-surface-level-2);
}

.container-exercise.container-level-3,
.container-sub.container-level-3 {
  background-color: var(--color-workbook-surface-level-3);
}

.container-exercise.container-level-4,
.container-sub.container-level-4 {
  background-color: var(--color-workbook-surface-level-4);
}

.container-sub {
  margin: var(--space-md) var(--space-lg);
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  border-left: var(--space-sm) solid var(--color-container-border-inactive);
  border-top: var(--space-xs) solid var(--color-container-border-passive);
  border-right: var(--space-xs) solid var(--color-container-border-passive);
  border-bottom: var(--space-xs) solid var(--color-container-border-passive);
}

.container-sub .workbook-element {
  border-left: none;
}

.container-title-level-1 h1,
.container-title-level-2 h2,
.container-title-level-3 h3,
.container-title-level-4 h4,
.container-title-level-5 h5,
.container-title-level-6 h6 {
  margin: 0;
}


.container-title-level-1 h1 {
  font-size: clamp(2.1rem, 4.5vw, 3rem);
}

.container-title-level-2 h2 {
  font-size: clamp(1.75rem, 3.4vw, 2.2rem);
}

.container-title-level-3 h3 {
  font-size: 1.3rem;
}

.container-title-level-4 h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-container-accent);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
  color: var(--color-container-accent);
  margin: 0 0 var(--space-md) 0;
  line-height: 1.25;
}

.markdown-content h2 {
  font-size: 1.8rem;
}

.markdown-content h3 {
  font-size: 1.3rem;
}

.markdown-content h4 {
  font-size: 1.1rem;
}

.markdown-content ul {
  margin: 0 0 var(--space-md) var(--space-xl);
}

.markdown-content ul:last-child {
  margin-bottom: 0;
}

/* Workbook Elements */

.workbook-element{
  border-left: var(--space-md) solid var(--color-container-border-passive);
}

.workbook-interaction{
  border-left: var(--space-md) solid var(--color-container-border-inactive);
  border-top: var(--space-xs) solid var(--color-container-border-passive);
  border-right: var(--space-xs) solid var(--color-container-border-passive);
  border-bottom: var(--space-xs) solid var(--color-container-border-passive);

}

.workbook-interaction:focus{
  border-color: var(--color-container-border-active);
}


/* Specific Elements */


/* headline */
h1 {
  color: var(--color-container-accent);
  text-align: center;
  font-weight: 600;
  font-size: clamp(2.1rem, 4.5vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h2 {
  color: var(--color-container-accent);
  text-align: left;
  font-weight: 600;
  font-size: clamp(1.75rem, 3.4vw, 2.2rem);
}

h3 {
  color: var(--color-container-accent);
  text-align: left;
  font-weight: 600;
  font-size: 16px;
}

.container-title {
  padding: var(--space-md) var(--space-lg);
}

.exercise-instruction {
  padding: var(--space-md) var(--space-lg);
  font-size: 0.95rem;
}

.instruction-content p {
  margin: 0 0 var(--space-md) 0;
}

.instruction-content p:last-child {
  margin-bottom: 0;
}

.instruction-content ul {
  margin-top: 0;
}

.instruction-callout {
  border-left: var(--space-xs) solid var(--color-container-border-active);
  background: var(--color-interaction-background);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  box-shadow: inset 0 0 0 1px var(--color-outline-blue-soft);
}

.instruction-callout--warning {
  border-left-color: var(--color-accent-error);
  background: var(--color-surface-subtle);
}

.button-line{
  margin: 0 auto;
  gap: var(--space-md);
  display: flex;
}

/* Horizontal Preview Cards */
.preview-line{
    display: flex;
    flex-direction: row;
    gap: var(--space-md);
}
.preview-line .preview-card {
    display: flex;
    align-items: center;
    flex-direction: column;
    gap: var(--space-md);

    background-color: var(--color-surface);
    padding: var(--space-md);
    flex: 1;   // Each item grows equally
}

.preview-line .preview-content{
}

.programming-preview-tree {
  width: 100%;
}

.programming-exercise-action-button {
  padding: var(--space-sm) var(--space-xl);
  border-radius: var(--radius-md);
  border: var(--interaction-border);
  background: var(--color-button-background);
  box-shadow: var(--shadow-button);
  color: var(--color-text-primary);
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  width: min(100%, 980px);
}

.programming-exercise-action-button:hover {
  background: var(--color-button-hover);
  transform: translateY(-1px);
}

/* --- Slide deck styling --- */
.slide-deck-navigation {
  position: sticky;
  top: var(--space-sm);
  z-index: 10;
  width: fit-content;
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  border: 1px solid var(--color-container-border-inactive);
  border-radius: var(--radius-md);
  background: var(--color-interaction-background);
  box-shadow: var(--shadow-button);
}

button {
  min-width: 120px;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  border: var(--interaction-border);
  background: var(--color-button-background);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-button);
  cursor: pointer;
  font-weight: 600;
  transition: var(--interaction-highlight-transition);
}

button:hover:not(:disabled) {
  background: var(--color-button-hover);
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

.slide-deck-counter {
  min-width: 72px;
  text-align: center;
  font-weight: 700;
  color: var(--color-container-accent);
  letter-spacing: 0.02em;
}

.slide-deck-container {
  margin: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  background: var(--color-interaction-background);
}

.slide-deck-image {
  width: 100%;
  display: flex;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-container-border-passive);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.slide-deck-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.slide-deck-source,
.slide-deck-description,
.slide-deck-text {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-container-border-passive);
  border-radius: var(--radius-sm);
  background: var(--color-container-background);
}

.slide-deck-source {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}


/* --- SVG Button Styling --- */
.svg-button {
  width: 52px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-button-border);
  background: var(--color-button-background);
  box-shadow: var(--shadow-button);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: pointer;
  padding: var(--space-xs);
}

.svg-button:hover {
  transform: translateY(-2px);
  background: var(--color-button-hover);
}

.svg-button svg {
  width: 30px;
  height: 30px;
  stroke: var(--color-text-primary);
  stroke-width: 1.8;
}

.svg-button path {
  transition: stroke 0.2s ease, fill 0.2s ease;
}

/* Button colors */
.svg-button.highlighted .button-borderpath,
.svg-button.highlighted .button-fill {
  fill: var(--color-surface-muted);
  stroke: var(--color-theme);
}

/* scaffolder button colors */
.svg-button .button-show-scaffolder {
  fill: var(--color-surface-muted);
  stroke: var(--color-dark);
}

.svg-button.highlighted .button-show-scaffolder {
  fill: var(--color-surface-muted);
  stroke: var(--color-dark);
}

/* Grading button colors */
.svg-button .button-grading-start .button-borderpath {
  fill: var(--color-surface-muted);
  stroke: var(--color-dark);
}

.svg-button.highlighted .button-grading-start .button-borderpath {
  fill: var(--color-surface-muted);
  stroke: var(--color-theme);
}

/* --- Editors --- */

textarea.workbook-interaction  {
  width: 100%;
  padding: var(--space-md);
  font-size: 0.95rem;
  resize: vertical;
  min-height: 100px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  box-sizing: border-box;
  outline: none;
  font-family: var(--font-family);
}

.simple-text-editor textarea.mono {
  font-family: 'JetBrains Mono', 'Fira Code', 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  resize: vertical;
  min-height: 50px;
}

.simple-text-editor textarea[disabled] {
  background: var(--color-interaction-background-alt);
  color: var(--color-text-secondary);
  cursor: not-allowed;
  opacity: 0.85;
}


.simple-selector-editor {
  width: 100%;
}

.simple-selector-editor__select {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-muted);
  color: var(--color-text-primary);
  padding: calc(var(--space-sm) + 2px) var(--space-md);
  font-size: 0.95rem;
  line-height: 1.4;
  appearance: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: pointer;
}

.simple-selector-editor__select:focus {
  outline: none;
  border-color: var(--color-focus);
  box-shadow: var(--shadow-focus);
  background: var(--color-interaction-background);
}

.simple-selector-editor__select[disabled] {
  background: var(--color-interaction-background-alt);
  color: var(--color-text-secondary);
  cursor: not-allowed;
  opacity: 0.85;
}


.workbook-interaction.simple-boolean-editor {
  width: 100%;
  box-sizing: border-box;
}

.simple-boolean-editor__body {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  width: 100%;
  padding: var(--space-md);
  background-color: var(--color-surface);
}

.simple-boolean-editor__checkbox {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: var(--radius-sm);
  border: var(--interaction-border);
  background: var(--color-surface);
  appearance: none;
  display: grid;
  place-items: center;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.simple-boolean-editor__checkbox::after {
  content: '';
  width: 0.35rem;
  height: 0.7rem;
  border: 2px solid var(--color-text-inverse);
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.simple-boolean-editor__checkbox:focus-visible {
  outline: none;
  border-color: var(--color-focus);
  box-shadow: var(--shadow-focus);
}

.simple-boolean-editor__checkbox:checked {
  background: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
}

.simple-boolean-editor__checkbox:checked::after {
  opacity: 1;
}

.simple-boolean-editor__label-text {
  color: var(--color-text-primary);
  letter-spacing: 0.01em;
}

.reorder-interaction {
  padding: var(--space-md);
}

.reorder-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.reorder-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-muted);
  padding: var(--space-sm) var(--space-md);
  box-shadow: var(--shadow-soft);
}

.reorder-item--dragging {
  opacity: 0.65;
}

.drop-placeholder {
  height: 2.5rem;
  border: 2px dashed var(--color-accent-primary);
  border-radius: var(--radius-sm);
  background: var(--color-interaction-background);
}
@media (max-width: 768px) {
  .container-exercise {
    padding: var(--space-lg);
  }


  .svg-button {
    width: 38px;
    height: 38px;
  }
}