/* EduFlexion Common Styles - Main.css */
:root {
    --bg-color: #FAFAFA;
    --text-color: #151515;
    --form-color: #ECECEC;
    --primary-btn: #97D214;
    --bg-primary: #DCF6A3;
    --active-btn: #BDBDBD;
    --card-border: #DED8FB;
    --text-violet: #6448EE;
    --bg-wrong: #FFE8CE;
    --color-wrong: #FF8800;
    --border-radius: 16px;
    --container-width: 1200px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

::selection {
    background: var(--text-violet);
    text-shadow: none;
}

body {
    background-color: var(--bg-color);
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    color: var(--text-color);
    line-height: 1.7;
}

/* Header & Navigation */
header {
    padding: 1rem;
    border-bottom: 1px solid #333;
    background-color: var(--bg-color);
    position: relative;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0;
}

.logo {
    text-decoration: none;
    display: flex;

    &.-violet {
        color: var(--text-violet);
    }

    & img {
        height: 32px;
    }
}

.nav-toggle {
    display: block;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
}

.nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--bg-color);
    padding: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.nav-menu.active {
    display: block;
    z-index: 1;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin-bottom: 0.5rem;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    display: block;
    padding: 0.5rem 0;
    transition: color 0.3s;
}

.nav-link:hover {
    color: var(--primary-btn);
}

.btn {
    background-color: var(--primary-btn);
    color: var(--bg-color);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background-color: var(--active-btn);
}

.btn:active {
    background-color: var(--active-btn);
    transform: translateY(0);
}

/* Breadcrumb (Article Page) */
.breadcrumb {
    padding: 1rem;
    max-width: var(--container-width);
    margin: 0 auto;
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--text-color);
    text-decoration: none;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.breadcrumb a:hover {
    background-color: var(--primary-btn);
}

.breadcrumb span {
    margin: 0 0.5rem;
    opacity: 0.5;
}

/* Hero Section (Main Page) */
.hero {
    padding: 2rem 1rem;
    text-align: center;
    max-width: var(--container-width);
    margin: 0 auto;
}

.hero h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

/* Courses Section (Main Page) */
.courses {
    padding: 2rem 1rem;
    max-width: var(--container-width);
    margin: 0 auto;
}

.section-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.course-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.course-card {
    border: 2px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: transform 0.3s;
}

.course-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-btn);
}

.course-card h3 {
    margin-bottom: 0.5rem;
}

.course-card p {
    margin-bottom: 1rem;
    opacity: 0.8;
    font-size: 0.9rem;
}

/* Article Header (Article Page) */
.article-header {
    max-width: var(--container-width);
    margin: 2rem auto;
    padding: 0;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

.article-category {
    background-color: var(--primary-btn);
    color: var(--bg-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: 500;
}

.article-title {
    font-size: 2rem;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.article-lead {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.article-image {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
}

.article-image figcaption {
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 0.5rem;
}

/* Article Content (Article Page) */
.article-content {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1rem 3rem;
}

.article-content h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    line-height: 1.3;
}

.article-content h3 {
    font-size: 1.25rem;
    margin: 1.5rem 0 1rem;
}

.article-content p {
    margin-bottom: 1.5rem;
}

.article-content blockquote {
    border-left: 4px solid var(--primary-btn);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    opacity: 0.9;
}

.article-content ul, .article-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
}

.article-content figure {
    margin: 2rem 0;
}

.article-content figcaption {
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 0.5rem;
}

/* Author Info (Article Page) */
.author-info {
    margin: 2rem auto;
    max-width: var(--container-width);
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    border: 2px solid var(--card-border);
    border-radius: var(--border-radius);
}

.author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.author-details h3 {
    margin-bottom: 0.25rem;
}

.author-bio {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* News & Articles Grid (Both Pages) */
.news, .suggested-articles {
    padding: 2rem 1rem;
    max-width: var(--container-width);
    margin: 0 auto;
}

.news-grid, .articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.news-card, .article-card {
    border: 2px solid var(--card-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: transform 0.3s;
}

.news-image, .article-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-content, .article-card-content {
    padding: 1.5rem;
}

.news-meta, .article-card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    opacity: 0.7;
}

.news-card h3, .article-card h3 {
    margin-bottom: 0.5rem;
}

.news-card p, .article-card p {
    margin-bottom: 1rem;
    opacity: 0.8;
    font-size: 0.9rem;
}

.read-more {
    color: var(--primary-btn);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Newsletter (Both Pages) */
.newsletter {
    padding: 2rem 1rem;
    background-color: var(--form-color);
    margin: 2rem 0;
}

.newsletter-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.newsletter h2 {
    margin-bottom: 1rem;
}

.newsletter p {
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-input {
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    border: 1px solid #444;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
}

/* Footer (Both Pages) */
footer {
    padding: 2rem 1rem;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.footer-link {
    color: var(--text-color);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-link:hover {
    opacity: 1;
}

.copyright {
    opacity: 0.6;
    font-size: 0.9rem;
}

/* Desktop Styles */
@media (min-width: 768px) {
    .header-container {
        padding: 0 1rem;
    }

    .nav-toggle {
        display: none;
    }

    .nav-menu {
        display: flex;
        position: static;
        width: auto;
        box-shadow: none;
        padding: 0;
    }

    .nav-list {
        display: flex;
        align-items: center;
        gap: 1.5rem;
    }

    .nav-item {
        margin-bottom: 0;
    }

    .hero h1, .article-title {
        font-size: 2.5rem;
    }

    .course-cards {
        grid-template-columns: repeat(3, 1fr);
    }

    .news-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .newsletter-form {
        flex-direction: row;
    }

    .form-input {
        flex: 1;
    }
}

@media (min-width: 1024px) {
    .news-grid, .articles-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

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

.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Focus States for Accessibility */
.btn:focus,
.nav-link:focus,
.form-input:focus,
.read-more:focus {
    outline: 2px solid var(--primary-btn);
    outline-offset: 2px;
}

/* Course Page Styles */
.course-header {
    padding: 2rem 1rem;
    max-width: var(--container-width);
    margin: 0 auto;
    border-bottom: 1px solid #333;
}

.course-header-container {
    text-align: center;
}

.course-header h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.course-description {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.course-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Course Structure */
.course-structure {
    padding: 2rem 1rem 3rem;
    max-width: var(--container-width);
    margin: 0 auto;
}

.course-structure-container {
    max-width: 900px;
    margin: 0 auto;
}

/* Theme Groups */
.theme-group {
    margin-bottom: 2.5rem;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--card-border);
}

.theme-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #333;
}

.theme-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-icon {
    font-size: 1.5rem;
}

.theme-description {
    opacity: 0.8;
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

/* Lessons List */
.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.lesson-item {
    display: flex;
    flex-flow: column nowrap;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    border: 1px solid #2a2a2a;
    transition: all 0.3s;
    gap: 1rem;
}

.lesson-item:hover {
    border-color: var(--active-btn);
}

.lesson-content {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    flex: 1;
}

.lesson-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    min-width: 2.5rem;
    background-color: var(--primary-btn);
    color: var(--bg-color);
    border-radius: 50%;
    font-weight: 700;
    font-size: 1rem;
}

.lesson-info {
    flex: 1;
}

.lesson-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.lesson-description {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.lesson-duration {
    font-size: 0.85rem;
    opacity: 0.7;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

/* Lesson Status */
.lesson-status {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
}

.lesson-status.completed {
    background-color: rgba(170, 238, 19, 0.2);
    color: var(--primary-btn);
    border: 1px solid rgba(170, 238, 19, 0.3);
}

.lesson-status.locked {
    background-color: var(--form-color);
    color: var(--text-color);
    opacity: 0.6;
    border: 1px solid #444;
}

/* Button Small Variant */
.btn-small {
    padding: 0.5rem 1.25rem;
    font-size: 0.9rem;
    white-space: nowrap;
}

/* No Lessons Message */
.no-lessons {
    text-align: center;
    padding: 2rem;
    opacity: 0.6;
    font-style: italic;
}

/* Desktop Styles for Course Page */
@media (min-width: 768px) {
    .course-header h1 {
        font-size: 2.5rem;
    }

    .course-description {
        font-size: 1.2rem;
    }

    .theme-group {
        padding: 2rem;
    }

    .lesson-item {
        padding: 1.5rem;
        flex-flow: row nowrap;
    }

    .lesson-title {
        font-size: 1.2rem;
    }
}

.lesson-header {
    padding: 2rem 1rem;
    max-width: var(--container-width);
    margin: 0 auto;
    border-bottom: 1px solid var(--card-border);
}

.lesson-header-container {
    text-align: center;
}

.lesson-header h1 {
    font-size: 2rem;
    margin: 1rem 0;
    line-height: 1.2;
}

.lesson-description {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.lesson-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 1.5rem;
}

/* Progress Bar */
.progress-container {
    max-width: 400px;
    margin: 0 auto;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--form-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-btn);
    border-radius: 4px;
    width: 0;
    transition: width 0.3s ease;
}

/* Test Container */
.test-container {
    padding: 2rem 1rem;
    max-width: var(--container-width);
    margin: 0 auto;
}

.test-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

/* Question Navigation */
.question-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--card-border);
}

.nav-btn {
    width: 2.5rem;
    height: 2.5rem;
    border: 1px solid var(--card-border);
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.nav-btn:hover {
    border-color: var(--primary-btn);
}

.nav-btn.active {
    background-color: var(--primary-btn);
    color: var(--text-violet);
    border-color: var(--primary-btn);
}

.nav-btn.answered {
    background-color: rgba(170, 238, 19, 0.2);
    border-color: var(--primary-btn);
}

/* Question Cards */
.questions-container {
    position: relative;
    min-height: 400px;
}

.question-card {
    display: none;
    background-color: var(--bg-color);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
}

.question-card.active {
    display: block;
}

.question-card.wrong {
    .answer-input:checked + .answer-label {
        background-color: var(--bg-wrong);
        border-color: var(--color-wrong);
    }

    .answer-input:checked + .answer-label .answer-letter {
        background-color: var(--color-wrong);
    }
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--card-border);
}

.question-number {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.points {
    background-color: var(--primary-btn);
    color: var(--bg-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.question-text {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.question-image {
    margin: 1.5rem 0;
    text-align: center;
}

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

/* Answers */
.answers-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.answer-option {
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all 0.3s;
}

.answer-input {
    display: none;
}

.answer-label {
    display: flex;
    align-items: center;
    padding: 1.25rem;
    cursor: pointer;
    transition: all 0.3s;
    gap: 1rem;
}

.answer-label:hover {
    background-color: rgba(170, 238, 19, 0.05);
}

.answer-input:checked + .answer-label {
    background-color: var(--bg-primary);
    border-color: var(--primary-btn);
}

.answer-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    min-width: 2rem;
    background-color: var(--form-color);
    color: var(--text-color);
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.9rem;
}

.answer-input:checked + .answer-label .answer-letter {
    background-color: var(--primary-btn);
    color: var(--bg-color);
}

.answer-text {
    flex: 1;
    line-height: 1.5;
}

/* Result Section */
.result-section {
    display: none;
    background-color: var(--bg-primary);
    border: 1px solid var(--primary-btn);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.result-section.show {
    display: block;
}

.result-header {
    margin-bottom: 1rem;
}

.result-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
    color: var(--primary-btn);
}

.theory-content {
    line-height: 1.6;
}

.examples {
    margin-top: 1rem;
}

.examples h4 {
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.examples ul {
    padding-left: 1.5rem;
}

.examples li {
    margin-bottom: 0.25rem;
}

/* Test Navigation */
.test-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding-top: 2rem;
    border-top: 1px solid var(--card-border);
}

.btn-secondary {
    background-color: var(--form-color);
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: var(--card-border);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-complete {
    background-color: var(--text-violet);
}

.btn-complete:hover {
    background-color: var(--text-violet);
}

/* Results Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-overlay.show {
    display: flex;
}

.modal-container {
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--card-border);
}

.modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Results Summary */
.results-summary {
    text-align: center;
    margin-bottom: 2rem;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: conic-gradient(var(--primary-btn) 0%, var(--form-color) 0%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    position: relative;
}

.score-circle::before {
    content: '';
    position: absolute;
    width: 100px;
    height: 100px;
    background-color: var(--bg-color);
    border-radius: 50%;
}

.score-percent {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    z-index: 1;
}

.score-text {
    font-size: 0.8rem;
    color: var(--text-color);
    opacity: 0.8;
    z-index: 1;
}

.results-details {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.result-stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Mobile Styles */
@media (max-width: 768px) {
    .lesson-header h1 {
        font-size: 1.5rem;
    }

    .lesson-description {
        font-size: 1rem;
    }

    .question-card {
        padding: 1.5rem;
    }

    .question-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .answer-label {
        padding: 1rem;
    }

    .test-navigation {
        flex-direction: column;
    }

    .test-navigation .btn {
        width: 100%;
    }

    .results-actions {
        flex-direction: column;
    }

    .results-details {
        gap: 1rem;
    }

    .modal-container {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .question-nav {
        gap: 0.25rem;
    }

    .nav-btn {
        width: 2rem;
        height: 2rem;
        font-size: 0.8rem;
    }

    .answer-label {
        gap: 0.5rem;
    }

    .answer-letter {
        align-self: flex-start;
    }
}