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

body {
    background-color: #000000;
    font-family: Arial, sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    color: #ffffff;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 30px;
    padding: 40px;
    background-color: #1a1a1a;
    border: 1px solid #333;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
    width: 400px;
}

h1 {
    font-size: 28px;
    font-weight: bold;
    color: #ffffff;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.timer {
    font-size: 64px;
    font-weight: bold;
    color: #ffffff;
    text-align: center;
}

.buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    width: 100%;
}

button {
    padding: 12px 24px;
    border: 1px solid #555;
    border-radius: 8px;
    background-color: #2a2a2a;
    color: #ffffff;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background-color: #3a3a3a;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 255, 255, 0.1);
}

button:active {
    transform: translateY(0);
}

.start {
    background-color: #4CAF50;
}

.start:hover {
    background-color: #45a049;
}

.stop {
    background-color: #f44336;
}

.stop:hover {
    background-color: #da190b;
}

.reset {
    background-color: #ff9800;
}

.reset:hover {
    background-color: #e68900;
}