/* === Color Variables === */
:root {
    --color-primary: #3B7A57;
    --color-secondary: #5F8F6B;
    --color-accent: #B07A1E;
    --color-bg-light: #F9F9F7;
    --color-text-dark: #1F1F1F;
    --color-neutral-mid: #6E6E6E;

    /* Semantic Colors from Simulator */
    --color-success-bg: #f0fdf4;
    --color-success-border: #16a34a;
    --color-success-text: #166534;

    --color-warning-bg: #fefce8;
    --color-warning-border: #ca8a04;
    --color-warning-text: #854d0e;

    --color-critical-bg: #fef2f2;
    --color-critical-border: #dc2626;
    --color-critical-text: #991b1b;
}

/* Module 2 Styles */
.row-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media (min-width: 650px) {
    .row-container {
        grid-template-columns: 1fr 1fr;
    }
}

.code-bad {
    border-left: 4px solid var(--color-critical-border);
}

.code-good {
    border-left: 4px solid var(--color-success-border);
}

.key-concept-box {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--color-accent);
    margin-bottom: 1.5rem;
}

/* Module 3 Styles */
.content-block {
    margin-bottom: 2rem;
}

.benefit-box {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: var(--color-bg-light);
    border-radius: 0.5rem;
}

.benefit-list {
    margin-top: 0.5rem;
}

.mermaid-container {
    margin: 2rem 0;
}

.visual-figure {
    margin: 2rem 0;
    text-align: center;
}

.figure-caption {
    font-size: 0.875rem;
    color: var(--color-neutral-mid);
    margin-top: 0.5rem;
}

.screenshot-image {
    width: 100%;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.step-list {
    margin-left: 1.5rem;
    margin-bottom: 2rem;
}

/* Module 4 (Quiz) Styles */
.quiz-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.quiz-question legend {
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quiz-option {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.form-actions,
.modal-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.modal-actions {
    margin-top: 1rem;
}

/* === Base Styles (Global System) === */
html {
    scroll-behavior: smooth;
    font-size: 16px;
    /* Global 16px Base */
}

body {
    font-family: 'Atkinson Hyperlegible', sans-serif;
    line-height: 1.6;
    font-weight: 400;
    background-color: var(--color-bg-light);
    color: var(--color-text-dark);
    margin: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Atkinson Hyperlegible', sans-serif;
    /* Explicitly force font */
    color: var(--color-primary);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    line-height: 1.2;
    font-weight: 700;
}

/* Typography Scale (Exact Matches) */
h1 {
    font-size: 40px;
}

h2 {
    font-size: 34px;
}

h3 {
    font-size: 28px;
    font-weight: 600;
    line-height: 1.25;
}

h4 {
    font-size: 22px;
    font-weight: 600;
    line-height: 1.25;
}

h5 {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.3;
}

h6 {
    font-size: 16px;
    line-height: 1.3;
}

@media (max-width: 900px) {
    h1 {
        font-size: 32px;
    }

    h2 {
        font-size: 28px;
    }
}

blockquote {
    font-style: italic;
    color: var(--color-neutral-mid);
    border-left: 4px solid var(--color-secondary);
    padding-left: 1rem;
    margin-left: 0;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.hidden {
    display: none !important;
}

img,
svg {
    max-width: 100%;
    height: auto;
}

code {
    background-color: #e9e9e7;
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
}

/* === Layout / Container System === */
/* Standard Container (Text-heavy) */
.container {
    width: 100%;
    max-width: 70ch;
    margin: 0 auto;
    padding: 0 1rem;
    box-sizing: border-box;
}

/* Wide Container (Media/Multi-column) - Adding for consistency */
.container-wide {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem;
    box-sizing: border-box;
}

/* === Course Specific Components === */

/* Header & Footer */
.course-header {
    background-color: var(--color-primary);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

.course-header h1 {
    color: white;
    margin-bottom: 0.5rem;
}

.course-footer {
    background-color: var(--color-primary);
    padding: 1rem;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Buttons */
.cta-button {
    background-color: var(--color-primary);
    color: white;
    font-weight: 700;
    padding: 0.75rem 2rem;
    border: 2px solid transparent;
    border-radius: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease-in-out;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    display: inline-block;
}

.cta-button:hover:not(:disabled) {
    background-color: var(--color-secondary);
}

.cta-button:disabled {
    background-color: var(--color-neutral-mid);
    cursor: not-allowed;
    opacity: 0.6;
}

.cta-button:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

.link-default {
    color: var(--color-primary);
    text-decoration: underline;
    transition: color 0.2s ease-in-out;
}

.link-default:hover,
.link-default:focus {
    color: var(--color-accent);
}

/* TOC Navigation */
#toc-nav {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.toc-link {
    background: none;
    border: 1px solid white;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    font-family: inherit;
}

.toc-link.active {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    font-weight: 700;
}

.toc-link:hover:not(.active) {
    background-color: var(--color-secondary);
}

.toc-link:focus-visible {
    outline: 3px solid var(--color-bg-light);
    outline-offset: 2px;
}

/* Module 1: Interactive Game */
.interactive-game {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: #fff;
    border-radius: 0.5rem;
    border: 1px solid var(--color-secondary);
}

@media (min-width: 600px) {
    .interactive-game {
        grid-template-columns: 1fr 1fr;
    }
}

.styled-heading {
    font-size: 28px;
    /* Matches h3 */
    color: var(--color-primary);
    font-weight: 700;
    line-height: 1.25;
}

.interactive-game .styled-heading {
    margin-bottom: 0;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 0.5rem;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.code-comparison {
    display: grid;
    gap: 1.5rem;
}

.code-snippet {
    background-color: var(--color-bg-light);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--color-secondary);
    font-family: 'Courier New', Courier, monospace;
    white-space: pre-wrap;
}

/* Module 1 Styles */
.module-container {
    max-width: 48rem;
    margin: 0 auto;
}

.intro-text {
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.concept-card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid #d4d4d4;
    margin-bottom: 1.5rem;
}

.tree-concept {
    background-color: #f0fdf4;
    /* subtle green tint */
    border-color: var(--color-secondary);
}

.tree-properties-list {
    list-style: none;
    padding: 0;
    margin-top: 1rem;
}

.tree-properties-list li {
    padding: 0.25rem 0;
    border-bottom: 1px dashed #ccc;
}

.code-example code {
    display: block;
    background-color: #f5f5f5;
    padding: 1rem;
    border-radius: 4px;
    font-family: monospace;
}

.dom-view .code-snippet {
    background-color: #f5f5f5;
}

.tree-view .tts-snippet {
    background-color: #e0f2f1;
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid #80cbc4;
    font-family: monospace;
}

.diagram-image {
    max-width: 150px;
    opacity: 0.5;
}

/* TTS Simulation */
.tts-container {
    background-color: #fff;
    border: 1px solid var(--color-secondary);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-top: 2rem;
}

.tts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-secondary);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.tts-header h3 {
    margin: 0;
}

.tts-comparison {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 600px) {
    .tts-comparison {
        grid-template-columns: 1fr 1fr;
    }
}

.tts-example {
    text-align: center;
}

.tts-button {
    width: 100%;
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-primary);
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    color: var(--color-primary);
}

.tts-button:hover {
    background-color: var(--color-secondary);
    color: white;
}

/* Quiz */
.quiz-container {
    background-color: #fff;
    padding: 2rem;
    border-radius: 0.5rem;
    border: 1px solid var(--color-secondary);
}

.quiz-question {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #eee;
}

.quiz-question:last-of-type {
    border-bottom: none;
    margin-bottom: 0;
}

.quiz-question p {
    font-weight: 700;
    margin-bottom: 1rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quiz-options label {
    display: block;
    padding: 0.75rem;
    border: 1px solid var(--color-neutral-mid);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.quiz-options label:hover {
    background-color: var(--color-bg-light);
}

.quiz-options input[type="radio"] {
    margin-right: 0.5rem;
}

/* === Layout Components === */

.navigation-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.progress-text {
    font-weight: 500;
    font-size: 1.125rem;
}

/* Helper Utilities (Used sparingly) */
.center-text {
    text-align: center;
}

.hidden {
    display: none !important;
}