/**
 * BTC University - Lesson Page Styles
 * Multi-component learning system with shard collection gamification
 * 
 * Learning Components:
 * - Video (Visual learning)
 * - Textbook (Reading/comprehension)
 * - Quiz (Knowledge testing)
 * - Writing (Application/reflection)
 * - Practice (Hands-on)
 */

/* ============================================
   LESSON PAGE LAYOUT
============================================ */

.lesson-page {
    display: grid;
    grid-template-columns: 1fr 20rem;
    gap: var(--space-8);
    padding: var(--space-8) 0;
}

.lesson-main {
    min-width: 0;
}

/* ============================================
   LESSON HEADER
============================================ */

.lesson-header {
    background: linear-gradient(135deg, var(--btcu-navy) 0%, var(--btcu-navy-light) 100%);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    margin-bottom: var(--space-8);
    color: var(--btcu-white);
}

.lesson-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--btcu-gray-300);
    margin-bottom: var(--space-4);
}

.lesson-breadcrumb a {
    color: var(--btcu-gold);
    text-decoration: none;
}

.lesson-breadcrumb a:hover {
    text-decoration: underline;
}

.lesson-breadcrumb svg {
    width: 1rem;
    height: 1rem;
}

.lesson-title {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-3);
}

.lesson-description {
    font-size: var(--text-base);
    color: var(--btcu-gray-300);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-6);
}

.lesson-meta {
    display: flex;
    gap: var(--space-6);
    flex-wrap: wrap;
}

.lesson-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
}

.lesson-meta-item svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--btcu-gold);
}

/* ============================================
   BIT COLLECTION PROGRESS
============================================ */

.lesson-bits {
    background: var(--btcu-white);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    margin-bottom: var(--space-8);
    border: 2px solid var(--btcu-gray-200);
}

.lesson-bits-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.lesson-bits-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.lesson-bits-icon {
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--btcu-gold) 0%, var(--btcu-orange) 100%);
    border-radius: var(--radius-lg);
    color: var(--btcu-white);
}

.lesson-bits-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

.lesson-bits-count {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
}

.lesson-bits-count strong {
    color: var(--btcu-orange);
    font-weight: var(--font-bold);
}

.lesson-bits-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-4);
}

.lesson-bit {
    aspect-ratio: 1;
    border-radius: var(--radius-xl);
    border: 2px solid var(--btcu-gray-200);
    background: var(--btcu-gray-50);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-3);
    text-align: center;
    transition: all var(--transition-default);
    position: relative;
    overflow: hidden;
}

.lesson-bit::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-default);
}

.lesson-bit.completed::before {
    opacity: 1;
}

/* Bit Types */
.lesson-bit.video {
    border-color: #9333EA;
}

.lesson-bit.video.completed {
    background: linear-gradient(135deg, #C084FC 0%, #9333EA 100%);
    border-color: #9333EA;
    color: var(--btcu-white);
}

.lesson-bit.reading {
    border-color: #2563EB;
}

.lesson-bit.reading.completed {
    background: linear-gradient(135deg, #60A5FA 0%, #2563EB 100%);
    border-color: #2563EB;
    color: var(--btcu-white);
}

.lesson-bit.quiz {
    border-color: #16A34A;
}

.lesson-bit.quiz.completed {
    background: linear-gradient(135deg, #4ADE80 0%, #16A34A 100%);
    border-color: #16A34A;
    color: var(--btcu-white);
}

.lesson-bit.writing {
    border-color: var(--btcu-orange);
}

.lesson-bit.writing.completed {
    background: linear-gradient(135deg, #FFA94D 0%, var(--btcu-orange) 100%);
    border-color: var(--btcu-orange);
    color: var(--btcu-white);
}

.lesson-bit.practice {
    border-color: var(--btcu-gold-dark);
}

.lesson-bit.practice.completed {
    background: linear-gradient(135deg, var(--btcu-gold) 0%, var(--btcu-gold-dark) 100%);
    border-color: var(--btcu-gold-dark);
    color: var(--btcu-navy);
}

.lesson-bit-icon {
    width: 2rem;
    height: 2rem;
    margin-bottom: var(--space-2);
    opacity: 0.5;
}

.lesson-bit.completed .lesson-bit-icon {
    opacity: 1;
}

.lesson-bit-icon svg {
    width: 100%;
    height: 100%;
}

.lesson-bit-label {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--btcu-gray-500);
}

.lesson-bit.completed .lesson-bit-label {
    color: inherit;
}

.lesson-bit-check {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    width: 1.25rem;
    height: 1.25rem;
    background: var(--btcu-success);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition-default);
}

.lesson-bit.completed .lesson-bit-check {
    opacity: 1;
    transform: scale(1);
}

.lesson-bit-check svg {
    width: 0.875rem;
    height: 0.875rem;
    color: var(--btcu-white);
}

/* ============================================
   LESSON COMPONENTS
============================================ */

.lesson-component {
    background: var(--btcu-white);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--space-6);
    overflow: hidden;
    border: 2px solid var(--btcu-gray-200);
    scroll-margin-top: calc(var(--header-height) + var(--space-4));
}

.lesson-component-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--btcu-gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.lesson-component-title-wrap {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.lesson-component-icon {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.lesson-component.video .lesson-component-icon {
    background: linear-gradient(135deg, #C084FC 0%, #9333EA 100%);
}

.lesson-component.reading .lesson-component-icon {
    background: linear-gradient(135deg, #60A5FA 0%, #2563EB 100%);
}

.lesson-component.quiz .lesson-component-icon {
    background: linear-gradient(135deg, #4ADE80 0%, #16A34A 100%);
}

.lesson-component.writing .lesson-component-icon {
    background: linear-gradient(135deg, #FFA94D 0%, var(--btcu-orange) 100%);
}

.lesson-component.practice .lesson-component-icon {
    background: linear-gradient(135deg, var(--btcu-gold) 0%, var(--btcu-gold-dark) 100%);
}

.lesson-component-icon svg {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--btcu-white);
}

.lesson-component.practice .lesson-component-icon svg {
    color: var(--btcu-navy);
}

.lesson-component-title-info h3 {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    margin-bottom: var(--space-1);
}

.lesson-component-subtitle {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.lesson-component-subtitle svg {
    width: 1rem;
    height: 1rem;
}

.lesson-component-status {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--btcu-gray-100);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--btcu-gray-600);
}

.lesson-component.completed .lesson-component-status {
    background: var(--btcu-success);
    color: var(--btcu-white);
}

.lesson-component-status svg {
    width: 1rem;
    height: 1rem;
}

.lesson-component-body {
    padding: var(--space-6);
}

/* ============================================
   VIDEO COMPONENT
============================================ */

.video-player {
    aspect-ratio: 16/9;
    background: var(--btcu-navy);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--space-6);
    position: relative;
}

.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--btcu-white);
}

.video-placeholder-icon {
    width: 5rem;
    height: 5rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.video-placeholder-text {
    font-size: var(--text-lg);
    color: var(--btcu-gray-300);
}

.video-transcript {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--btcu-gray-100);
}

.video-transcript-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: transparent;
    border: none;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--btcu-orange);
    cursor: pointer;
    padding: 0;
}

.video-transcript-toggle:hover {
    text-decoration: underline;
}

.video-transcript-toggle svg {
    width: 1rem;
    height: 1rem;
}

.video-transcript-content {
    margin-top: var(--space-4);
    font-size: var(--text-sm);
    color: var(--btcu-gray-600);
    line-height: var(--leading-relaxed);
    display: none;
}

.video-transcript-content.open {
    display: block;
}

/* ============================================
   READING COMPONENT
============================================ */

.reading-content {
    font-size: var(--text-base);
    color: var(--btcu-gray-700);
    line-height: var(--leading-relaxed);
}

.reading-content h4 {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
}

.reading-content h4:first-child {
    margin-top: 0;
}

.reading-content p {
    margin-bottom: var(--space-4);
}

.reading-content ul,
.reading-content ol {
    margin-bottom: var(--space-4);
    padding-left: var(--space-6);
}

.reading-content li {
    margin-bottom: var(--space-2);
}

.reading-content strong {
    color: var(--btcu-navy);
    font-weight: var(--font-semibold);
}

.reading-content em {
    font-style: italic;
}

.reading-content code {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    background: var(--btcu-gray-100);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    color: var(--btcu-orange);
}

.reading-callout {
    background: rgba(37, 99, 235, 0.05);
    border-left: 4px solid #2563EB;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin: var(--space-6) 0;
}

.reading-callout-title {
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.reading-callout-title svg {
    width: 1.25rem;
    height: 1.25rem;
    color: #2563EB;
}

/* ============================================
   QUIZ COMPONENT
============================================ */

.quiz-question {
    margin-bottom: var(--space-8);
}

.quiz-question:last-child {
    margin-bottom: 0;
}

.quiz-question-number {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--btcu-gray-500);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    margin-bottom: var(--space-2);
}

.quiz-question-text {
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    color: var(--btcu-navy);
    margin-bottom: var(--space-4);
    line-height: var(--leading-snug);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--btcu-gray-50);
    border: 2px solid var(--btcu-gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quiz-option:hover {
    background: var(--btcu-white);
    border-color: var(--btcu-gold);
}

.quiz-option.selected {
    background: var(--btcu-white);
    border-color: var(--btcu-orange);
}

.quiz-option.correct {
    background: rgba(22, 163, 74, 0.1);
    border-color: var(--btcu-success);
}

.quiz-option.incorrect {
    background: rgba(220, 38, 38, 0.1);
    border-color: var(--btcu-error);
}

.quiz-option-radio {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: var(--radius-full);
    border: 2px solid var(--btcu-gray-300);
    flex-shrink: 0;
    position: relative;
    transition: all var(--transition-fast);
}

.quiz-option.selected .quiz-option-radio {
    border-color: var(--btcu-orange);
    background: var(--btcu-orange);
}

.quiz-option.selected .quiz-option-radio::after {
    content: '';
    position: absolute;
    inset: 4px;
    background: var(--btcu-white);
    border-radius: var(--radius-full);
}

.quiz-option.correct .quiz-option-radio {
    border-color: var(--btcu-success);
    background: var(--btcu-success);
}

.quiz-option.incorrect .quiz-option-radio {
    border-color: var(--btcu-error);
    background: var(--btcu-error);
}

.quiz-option-text {
    flex: 1;
    font-size: var(--text-base);
    color: var(--btcu-gray-700);
}

.quiz-option-icon {
    width: 1.5rem;
    height: 1.5rem;
    opacity: 0;
}

.quiz-option.correct .quiz-option-icon,
.quiz-option.incorrect .quiz-option-icon {
    opacity: 1;
}

.quiz-option.correct .quiz-option-icon {
    color: var(--btcu-success);
}

.quiz-option.incorrect .quiz-option-icon {
    color: var(--btcu-error);
}

.quiz-feedback {
    margin-top: var(--space-4);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    display: none;
}

.quiz-feedback.show {
    display: block;
}

.quiz-feedback.correct {
    background: rgba(22, 163, 74, 0.1);
    color: #15803D;
    border: 1px solid #16A34A;
}

.quiz-feedback.incorrect {
    background: rgba(220, 38, 38, 0.1);
    color: #B91C1C;
    border: 1px solid #DC2626;
}

.quiz-submit {
    margin-top: var(--space-6);
}

/* ============================================
   WRITING COMPONENT
============================================ */

.writing-prompt {
    background: rgba(247, 147, 26, 0.05);
    border-left: 4px solid var(--btcu-orange);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-6);
}

.writing-prompt p {
    color: var(--btcu-gray-700);
    line-height: var(--leading-relaxed);
}

.writing-textarea {
    width: 100%;
    min-height: 12rem;
    padding: var(--space-4);
    background: var(--btcu-gray-50);
    border: 2px solid var(--btcu-gray-200);
    border-radius: var(--radius-lg);
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--btcu-navy);
    line-height: var(--leading-relaxed);
    resize: vertical;
    transition: all var(--transition-fast);
}

.writing-textarea:focus {
    outline: none;
    border-color: var(--btcu-orange);
    background: var(--btcu-white);
    box-shadow: 0 0 0 3px rgba(247, 147, 26, 0.1);
}

.writing-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-3);
}

.writing-count {
    font-size: var(--text-sm);
    color: var(--btcu-gray-500);
}

.writing-actions {
    display: flex;
    gap: var(--space-3);
}

/* ============================================
   LESSON SIDEBAR
============================================ */

.lesson-sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--space-8));
    height: fit-content;
}

.lesson-sidebar-card {
    background: var(--btcu-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--btcu-gray-200);
    overflow: hidden;
    margin-bottom: var(--space-6);
}

.lesson-sidebar-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--btcu-gray-100);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--btcu-navy);
}

.lesson-sidebar-body {
    padding: var(--space-4);
}

/* Lesson Navigation */
.lesson-nav-list {
    display: flex;
    flex-direction: column;
}

.lesson-nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--btcu-gray-600);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.lesson-nav-item:hover {
    background: var(--btcu-gray-100);
}

.lesson-nav-item.active {
    background: var(--btcu-gold-light);
    color: var(--btcu-navy);
    font-weight: var(--font-medium);
}

.lesson-nav-icon {
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-md);
    background: var(--btcu-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.lesson-nav-item.completed .lesson-nav-icon {
    background: var(--btcu-success);
    color: var(--btcu-white);
}

.lesson-nav-icon svg {
    width: 1rem;
    height: 1rem;
}

/* Component Actions */
.component-action {
    width: 100%;
    padding: var(--space-3);
    justify-content: center;
}

/* ============================================
   RESPONSIVE STYLES
============================================ */

@media (max-width: 1024px) {
    .lesson-page {
        grid-template-columns: 1fr;
    }
    
    .lesson-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
    
    .lesson-bits-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

@media (max-width: 768px) {
    .lesson-bits-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .lesson-sidebar {
        grid-template-columns: 1fr;
    }
    
    .lesson-header {
        padding: var(--space-6);
    }
    
    .lesson-title {
        font-size: var(--text-2xl);
    }
    
    .lesson-meta {
        flex-direction: column;
        gap: var(--space-3);
    }
}

@media (max-width: 480px) {
    .lesson-bits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}