/* ============================================
   DIFFUSION MODELS TUTORIAL - COMPONENT STYLES
   Diffusion process visualizations
   ============================================ */

/* ============================================
   LEARNING GRID
   ============================================ */

.learning-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
    margin: var(--space-md) 0;
}

.learning-item {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-base);
}

.learning-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
}

.learning-item .icon {
    font-size: 3rem;
    margin-bottom: var(--space-sm);
}

.learning-item h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.learning-item p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ============================================
   DIFFUSION PROCESS BOXES
   ============================================ */

.dual-process {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin: var(--space-md) 0;
}

.forward-box {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(248, 113, 113, 0.1) 100%);
    border: 2px solid var(--color-forward);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
}

.reverse-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(52, 211, 153, 0.1) 100%);
    border: 2px solid var(--color-reverse);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
}

.process-title {
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.forward-box .process-title {
    color: var(--color-forward);
}

.reverse-box .process-title {
    color: var(--color-reverse);
}

/* ============================================
   FORMULA BOX
   ============================================ */

.formula-box {
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(0, 212, 255, 0.3);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    margin: var(--space-md) 0;
    text-align: center;
}

.main-formula {
    font-family: var(--font-code);
    font-size: 1.5rem;
    color: var(--accent-primary);
    margin: var(--space-sm) 0;
}

.formula-step {
    font-family: var(--font-code);
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin: var(--space-xs) 0;
}

.formula-note {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: var(--space-xs);
}

/* ============================================
   HIGHLIGHT BOXES
   ============================================ */

.highlight-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-left: 4px solid var(--accent-primary);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    margin: var(--space-md) 0;
}

.forward-highlight {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(248, 113, 113, 0.1) 100%);
    border-left: 4px solid var(--color-forward);
}

.reverse-highlight {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(52, 211, 153, 0.1) 100%);
    border-left: 4px solid var(--color-reverse);
}

/* ============================================
   VISUALIZATIONS
   ============================================ */

.diffusion-viz,
.forward-viz,
.reverse-viz,
.schedule-viz {
    padding: var(--space-lg);
    background: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-lg);
    margin: var(--space-md) 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.diffusion-viz canvas,
.forward-viz canvas,
.reverse-viz canvas,
.schedule-viz canvas {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    background: rgba(0, 0, 0, 0.2);
    margin-bottom: var(--space-md);
}

.animation-controls {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.animation-status {
    margin-top: var(--space-md);
    padding: var(--space-sm);
    background: rgba(0, 212, 255, 0.1);
    border-radius: var(--radius-sm);
    text-align: center;
    color: var(--accent-primary);
    font-weight: 500;
}

/* ============================================
   NOISE SCHEDULE VISUALIZATION
   ============================================ */

.schedule-selector {
    margin: var(--space-md) 0;
    padding: var(--space-lg);
    background: rgba(245, 158, 11, 0.1);
    border: 2px solid var(--color-schedule);
    border-radius: var(--radius-md);
}

.schedule-label {
    font-weight: 600;
    color: var(--color-schedule);
    margin-bottom: var(--space-sm);
    text-align: center;
}

.schedule-buttons {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.schedule-btn {
    padding: var(--space-xs) var(--space-md);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.schedule-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.schedule-btn.active {
    background: var(--color-schedule);
    border-color: var(--color-schedule);
    color: white;
}

/* ============================================
   TIMELINE (Diffusion Steps)
   ============================================ */

.diffusion-timeline {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin: var(--space-md) 0;
    padding: var(--space-md);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
}

.timeline-step {
    flex: 1;
    text-align: center;
    padding: var(--space-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.timeline-step.start {
    background: rgba(59, 130, 246, 0.2);
    border: 2px solid var(--color-clean);
}

.timeline-step.end {
    background: rgba(107, 114, 128, 0.2);
    border: 2px solid var(--color-noise);
}

.timeline-arrow {
    color: var(--text-muted);
    font-size: 1.5rem;
}

/* ============================================
   CODE BLOCKS
   ============================================ */

.code-block {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin: var(--space-md) 0;
    overflow-x: auto;
}

.code-block pre {
    font-family: var(--font-code);
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.code-block code {
    font-family: var(--font-code);
}

/* ============================================
   COMPARISON TABLE
   ============================================ */

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-md) 0;
}

.comparison-table th,
.comparison-table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison-table th {
    background: rgba(0, 212, 255, 0.1);
    color: var(--accent-primary);
    font-weight: 600;
}

.comparison-table td {
    color: var(--text-secondary);
}

.comparison-table .highlight {
    color: var(--color-reverse);
    font-weight: 600;
}

/* ============================================
   APPLICATION CARDS
   ============================================ */

.application-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
    margin: var(--space-md) 0;
}

.application-card {
    padding: var(--space-lg);
    background: rgba(16, 185, 129, 0.05);
    border: 2px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-md);
}

.application-card h4 {
    color: var(--color-reverse);
    margin-bottom: var(--space-sm);
}

.application-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.application-card .example {
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ============================================
   COMPLETION BOX
   ============================================ */

.completion-box {
    background: var(--gradient-primary);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    text-align: center;
}

.completion-box h4 {
    font-size: 1.5rem;
    margin: var(--space-md) 0;
    color: white;
}

.completion-box ul {
    list-style: none;
    margin: var(--space-md) 0;
    text-align: left;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.completion-box li {
    padding: var(--space-xs) 0;
    color: rgba(255, 255, 255, 0.9);
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

@media (max-width: 768px) {
    .dual-process {
        grid-template-columns: 1fr;
    }

    .learning-grid,
    .application-grid {
        grid-template-columns: 1fr;
    }

    .diffusion-timeline {
        flex-direction: column;
    }

    .timeline-arrow {
        transform: rotate(90deg);
    }
}