/* ==========================================
   Flutter & Dart Course - Global Styles
   ========================================== */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0A0E27;
    --bg-secondary: #1A1F3A;
    --bg-card: #242B4A;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.7;
}

/* Background Animation */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.background-animation::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: var(--module-color, #10B981);
    filter: blur(100px);
    opacity: 0.15;
    top: -200px;
    right: -200px;
    animation: float 25s infinite ease-in-out;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0);
    }

    50% {
        transform: translate(-80px, 80px);
    }
}

/* Breadcrumb Navigation */
.breadcrumb {
    position: relative;
    z-index: 10;
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--module-color, #10B981);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb a:hover {
    color: var(--module-color-dark, #059669);
}

.breadcrumb-separator {
    opacity: 0.5;
}

/* Header Styles */
header {
    position: relative;
    z-index: 10;
    padding: 2rem 2rem 1.5rem;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.module-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: linear-gradient(135deg, var(--module-color, #10B981), var(--module-color-dark, #059669));
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--module-color, #10B981), var(--module-color-dark, #059669));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.section-label,
.subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Container */
.container {
    position: relative;
    z-index: 5;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 2rem 4rem;
}

/* Module Grid (Index Page) */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.module-card {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--module-color), var(--module-color-dark));
    border-radius: 20px;
    opacity: 0;
    z-index: -1;
    transition: opacity 0.3s ease;
}

.module-card:hover::before {
    opacity: 0.3;
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.module-number {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--module-color), var(--module-color-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.75rem;
}

.module-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.module-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.module-arrow {
    margin-top: 1rem;
    color: var(--module-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.85rem;
}

/* Section/Lesson Cards */
.lessons-grid,
.sections-grid {
    display: grid;
    gap: 1.25rem;
}

.lesson-card,
.section-card {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 1.75rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.lesson-card:hover,
.section-card:hover {
    transform: translateX(8px);
    border-color: var(--module-color);
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.15);
}

.lesson-number,
.section-number {
    display: flex;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--module-color), var(--module-color-dark));
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.lesson-content,
.section-content {
    flex: 1;
}

.lesson-title,
.section-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.lesson-description,
.section-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.lesson-status {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.arrow-icon {
    width: 20px;
    height: 20px;
    color: var(--module-color);
    transition: transform 0.3s ease;
}

.lesson-card:hover .arrow-icon,
.section-card:hover .arrow-icon {
    transform: translateX(4px);
}

/* Content Card (Lesson Pages) */
.content {
    position: relative;
    z-index: 5;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem 4rem;
}

.content-card {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 3rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 40px rgba(16, 185, 129, 0.1);
}

/* Markdown Content Styles */
.markdown-content {
    color: var(--text-primary);
}

.markdown-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 2rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color, rgba(255, 255, 255, 0.1));
}

.markdown-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
    color: var(--module-color);
}

.markdown-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 1.25rem 0 0.5rem;
}

.markdown-content p {
    margin: 1rem 0;
    line-height: 1.8;
    color: var(--text-secondary);
}

.markdown-content ul,
.markdown-content ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

.markdown-content li {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

.markdown-content code {
    font-family: 'Fira Code', monospace;
    background: #1a1b26;
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
}

.markdown-content pre {
    margin: 1.5rem 0;
    background: #1a1b26;
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    border-radius: 12px;
    overflow-x: auto;
}

.markdown-content pre code {
    display: block;
    padding: 1.5rem;
    border: none;
    background: transparent;
}

.markdown-content blockquote {
    border-left: 4px solid var(--module-color);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--text-secondary);
}

.markdown-content a {
    color: var(--module-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease;
}

.markdown-content a:hover {
    border-bottom-color: var(--module-color);
}

.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.markdown-content th,
.markdown-content td {
    padding: 0.75rem;
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    text-align: left;
}

.markdown-content th {
    background: rgba(16, 185, 129, 0.1);
    /* Keep this or make it variable? Let's keep it for now or use var(--module-color) with opacity if possible, but CSS doesn't support color manipulation easily without calc-color. I'll leave it as is or use a variable if I define one. */
    background: var(--table-header-bg, rgba(16, 185, 129, 0.1));
    font-weight: 600;
}

/* Mind Map Section */
.mindmap-section {
    position: relative;
    z-index: 5;
    max-width: 1200px;
    margin: 0 auto 3rem;
    padding: 0 2rem;
}

.mindmap-container {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.mindmap-container:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    border-color: var(--module-color);
}

.mindmap-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.mindmap-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.mindmap-container img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    display: block;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    max-width: 95%;
    max-height: 95%;
    position: relative;
}

.modal-content img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.close-modal {
    position: absolute;
    top: -40px;
    right: 0;
    color: #fff;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    line-height: 1;
}

.close-modal:hover {
    color: #bbb;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Footer */
footer {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer a {
    color: var(--module-color);
    text-decoration: none;
}

footer a:hover {
    color: var(--module-color-dark);
}

/* Responsive Design */
@media (max-width: 768px) {
    .breadcrumb {
        padding: 1rem 1.5rem;
    }

    header {
        padding: 1.5rem;
    }

    .container {
        padding: 2rem 1.5rem 3rem;
    }

    .content {
        padding: 0 1.5rem 3rem;
    }

    .content-card {
        padding: 2rem 1.5rem;
    }

    .modules-grid {
        grid-template-columns: 1fr;
    }

    .lesson-card,
    .section-card {
        padding: 1.5rem;
    }

    .mindmap-section {
        padding: 0 1.5rem;
    }
}