:root {
    --primary-color: #1a1a1a;
    --secondary-color: #2c2c2c;
    --accent-color: #febf11;
    --text-color: #e0e0e0;
    --background-color: #121212;
    --light-bg-color: #3c3c3c;
    --cta-bg-color: #febf11;
    --cta-text-color: #1a1a1a;
}

body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Arial', sans-serif;
}

.timer-container {
    width: 30%;
    max-width: 600px;
    background-color: var(--primary-color);
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
    padding: 20px;
}

h1 {
    text-align: center;
    color: var(--accent-color);
}

.timer-display {
    display: flex;
    justify-content: center;
    background-color: var(--secondary-color);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
}

.time-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 10px;
}

.digit {
    font-size: 5vw;
    font-weight: bold;
    color: var(--accent-color);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.separator {
    font-size: 5vw;
    color: var(--text-color);
    align-self: center;
    padding: 0 5px;
}

.label {
    font-size: 0.8rem;
    color: var(--text-color);
    margin-top: 5px;
    text-transform: uppercase;
}

.settings {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 10px;
}

.input-group {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.input-group label {
    margin-bottom: 5px;
    font-size: 0.8rem;
    color: var(--text-color);
}

.input-group input {
    padding: 8px;
    background-color: var(--light-bg-color);
    border: none;
    border-radius: 4px;
    color: var(--text-color);
    font-size: 1rem;
}

.controls {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

.btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-start {
    background-color: var(--cta-bg-color);
    color: var(--cta-text-color);
}

.btn-pause {
    background-color: var(--light-bg-color);
    color: var(--text-color);
}

.btn-stop {
    background-color: var(--primary-color);
    border: 1px solid var(--text-color);
    color: var(--text-color);
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

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

/* When timer is paused */
.paused .digit {
    opacity: 0.6;
}

/* When timer is running */
.running .digit {
    animation: pulse 1s infinite alternate;
}

@keyframes pulse {
    from {
        opacity: 1;
    }
    to {
        opacity: 0.8;
    }
}

/* Make responsive */
@media (max-width: 768px) {
    .timer-container {
        width: 80%;
    }
    
    .digit {
        font-size: 8vw;
    }
    
    .separator {
        font-size: 8vw;
    }
}

.copyright-message {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.8rem;
    text-align: center;
    margin-top: 20px;
}

.copyright-message a {
    color: var(--text-color);
    text-decoration: none;
}