/* Embedded Firmware Security Lab - Wokwi */
* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #0f172a 100%);
    color: #e0e0e0;
    min-height: 100vh;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 24px;
}

header h1 {
    margin: 0 0 8px 0;
    font-size: 2rem;
    color: #fbbf24;
}

.subtitle {
    color: #888;
    margin: 0;
}

main {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.control-panel {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn-primary {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    background: linear-gradient(90deg, #fbbf24, #f59e0b);
    color: #1a1a2e;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(251, 191, 36, 0.3);
}

.btn-secondary {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    background: #333;
    color: #ccc;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background: #555;
}

.status-indicator {
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    background: #222;
    border: 1px solid #444;
}

.lab-description {
    background: #111;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.lab-description h3 {
    margin-top: 0;
    color: #fbbf24;
}

.lab-exercises {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.exercise-card {
    background: #0f172a;
    border-radius: 12px;
    padding: 20px;
    border: 1px solid #333;
    transition: transform 0.2s;
}

.exercise-card:hover {
    transform: translateY(-4px);
    border-color: #fbbf24;
}

.exercise-card h4 {
    margin: 0 0 12px 0;
    color: #fff;
    font-size: 1.1rem;
}

.exercise-card p {
    margin: 0 0 12px 0;
    color: #aaa;
    font-size: 0.9rem;
}

.exercise-card pre {
    background: #1a1a2e;
    padding: 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    overflow-x: auto;
    color: #86efac;
    margin: 0 0 10px 0;
}

.difficulty {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.exercise-card:nth-child(1) .difficulty {
    background: #10b981;
    color: #fff;
}

.exercise-card:nth-child(2) .difficulty {
    background: #f59e0b;
    color: #fff;
}

.exercise-card:nth-child(3) .difficulty {
    background: #f59e0b;
    color: #fff;
}

.exercise-card:nth-child(4) .difficulty {
    background: #ef4444;
    color: #fff;
}

.instructions {
    background: #111;
    border-radius: 12px;
    padding: 20px;
}

.instructions h3 {
    margin-top: 0;
    color: #fbbf24;
}

.instructions ol {
    margin: 16px 0;
    padding-left: 20px;
}

.instructions li {
    margin: 8px 0;
}

.solution-guide {
    background: #111;
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
}

.solution-guide summary {
    margin: 0;
    color: #fbbf24;
    font-weight: 600;
    cursor: pointer;
}

.solutions {
    margin-top: 16px;
    padding: 0 10px;
}

.solutions h4 {
    color: #86efac;
    margin: 16px 0 8px 0;
}

.solutions p {
    margin: 8px 0;
    color: #aaa;
}

.solutions pre {
    background: #1a1a2e;
    padding: 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: #86efac;
    margin: 8px 0;
}

code {
    background: #222;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: #fbbf24;
}

@media (max-width: 768px) {
    .control-panel {
        flex-direction: column;
        align-items: stretch;
    }
    
    .lab-exercises {
        grid-template-columns: 1fr;
    }
}