:root {
    --primary-color: #4a6fa5;
    --secondary-color: #166088;
    --background-color: #1a1a2e;
    --text-color: #e6e6e6;
    --accent-color: #4fc3f7;
    --border-color: #2d2d42;
    --button-bg: #3a3a5e;
    --button-hover: #4a4a6e;
    --lap-even-bg: rgba(26, 26, 46, 0.5);
    --lap-odd-bg: rgba(42, 42, 62, 0.5);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto Mono', monospace;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2rem;
    color: var(--accent-color);
    letter-spacing: 2px;
}

.theme-switcher {
    display: flex;
    gap: 0.5rem;
}

.time-display {
    font-size: 4rem;
    text-align: center;
    margin: 2rem 0;
    font-family: 'Orbitron', sans-serif;
    color: var(--accent-color);
    text-shadow: 0 0 10px rgba(79, 195, 247, 0.3);
}

.controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg);
    color: var(--text-color);
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    background-color: var(--button-hover);
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn i {
    font-size: 1rem;
}

.start-btn {
    background-color: #2e7d32;
}

.start-btn:hover {
    background-color: #388e3c;
}

.pause-btn {
    background-color: #d32f2f;
}

.pause-btn:hover {
    background-color: #f44336;
}

.lap-btn {
    background-color: var(--primary-color);
}

.reset-btn {
    background-color: #ff8f00;
}

.reset-btn:hover {
    background-color: #ffa000;
}

.laps-container {
    background-color: rgba(26, 26, 46, 0.7);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-top: 2rem;
}

.laps-container h2 {
    margin-bottom: 1rem;
    color: var(--accent-color);
    font-size: 1.5rem;
}

.laps-header {
    display: grid;
    grid-template-columns: 50px 1fr 1fr 100px;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.laps-list {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.lap-item {
    display: grid;
    grid-template-columns: 50px 1fr 1fr 100px;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    align-items: center;
}

.lap-item:nth-child(even) {
    background-color: var(--lap-even-bg);
}

.lap-item:nth-child(odd) {
    background-color: var(--lap-odd-bg);
}

.lap-item.fastest {
    color: #4caf50;
}

.lap-item.slowest {
    color: #f44336;
}

.lap-stats {
    display: flex;
    justify-content: space-around;
    margin: 1rem 0;
    padding: 1rem;
    background-color: rgba(42, 42, 62, 0.5);
    border-radius: 5px;
}

.lap-stats div {
    display: flex;
    gap: 0.5rem;
}

.export-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.export-json {
    background-color: #6a1b9a;
}

.export-csv {
    background-color: #0277bd;
}

.app-footer {
    margin-top: 2rem;
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: #888;
}

.app-footer span {
    color: var(--accent-color);
    margin: 0 0.5rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .time-display {
        font-size: 3rem;
    }
    
    .laps-header, .lap-item {
        grid-template-columns: 40px 1fr 1fr 80px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }
    
    .time-display {
        font-size: 2.5rem;
    }
    
    .controls {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .laps-header, .lap-item {
        grid-template-columns: 30px 1fr 1fr 70px;
        font-size: 0.9rem;
    }
}