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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

main {
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    overflow: hidden;
}

.input-section, .results-section {
    padding: 30px;
}

.input-section h2, .results-section h2 {
    color: #333;
    margin-bottom: 25px;
    font-size: 1.5rem;
    font-weight: 600;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.input-group input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: #ff6b6b;
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}

.btn-primary {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.timeline {
    margin-bottom: 30px;
}

.timeline-item {
    display: flex;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid #f0f0f0;
}

.timeline-item:last-child {
    border-bottom: none;
}

.timeline-time {
    font-weight: 600;
    color: #ff6b6b;
    min-width: 80px;
    font-size: 1.1rem;
}

.timeline-action {
    margin-left: 20px;
    flex: 1;
}

.timeline-action.break {
    color: #e74c3c;
    font-weight: 500;
}

.timeline-action.start {
    color: #27ae60;
    font-weight: 500;
}

.timeline-action.stop {
    color: #e67e22;
    font-weight: 500;
}

.timeline-duration {
    color: #666;
    font-size: 0.9rem;
    margin-left: 10px;
}

.summary {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    margin-top: 20px;
}

.summary h3 {
    margin-bottom: 20px;
    color: #333;
    font-size: 1.3rem;
}

.summary-grid {
    display: grid;
    gap: 15px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid #e9ecef;
}

.summary-item:last-child {
    border-bottom: none;
}

.summary-item .label {
    font-weight: 500;
    color: #555;
}

.summary-item .value {
    font-weight: 600;
    color: #ff6b6b;
    font-size: 1.1rem;
}

/* Mobile optimizations */
@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .input-section, .results-section {
        padding: 20px;
    }
    
    .timeline-item {
        flex-direction: row;
        align-items: center;
        gap: 10px;
        padding: 12px 0;
    }
    
    .timeline-time {
        min-width: 70px;
        font-size: 1rem;
    }
    
    .timeline-action {
        margin-left: 0;
        flex: 1;
    }
    
    .timeline-duration {
        font-size: 0.8rem;
        margin-left: 5px;
    }
    
    .summary-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}

/* Animation for results */
.results-section {
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}