@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: 150px;
    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);
    width: 100%;
}

.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 {
    height: 100%;
    width: 100%;
}

.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;

    height: 100%;
    width: 100%;
}

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

    height: 100%;
    width: 100%;
}


.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;
}


.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;
    }
}