* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    height: 100vh;
    background: linear-gradient(135deg, #1d2671, #c33764);
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Main Container */
.stopwatch-container {
    background: #ffffff;
    padding: 40px 50px;
    border-radius: 16px;
    width: 350px;
    text-align: center;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.25);
}

/* Heading */
.stopwatch-container h1 {
    font-size: 28px;
    color: #333;
    margin-bottom: 25px;
}

/* Display */
.display {
    font-size: 42px;
    font-weight: bold;
    color: #1d2671;
    margin-bottom: 30px;
    letter-spacing: 2px;
}

/* Buttons Container */
.btns {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

/* Common Button */
.btn {
    flex: 1;
    padding: 12px 0;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

/* Start Button */
.start {
    background: #28a745;
    color: #fff;
}

.start:hover {
    background: #218838;
}

/* Stop Button */
.stop {
    background: #dc3545;
    color: #fff;
}

.stop:hover {
    background: #c82333;
}

/* Reset Button */
.reset {
    background: #6c757d;
    color: #fff;
}

.reset:hover {
    background: #5a6268;
}