---

body {
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
}

.timer-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
    width: 300px;
}

.timer-display {
    font-size: 48px;
    font-weight: bold;
    margin: 20px 0;
    color: #333;
    font-family: monospace;
}

.timer-display.finished {
    color: #ff4d4f;
    animation: blink 0.5s infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

input {
    padding: 10px;
    font-size: 18px;
    border: 2px solid #ddd;
    border-radius: 5px;
    outline: none;
}

.button-group {
    display: flex;
    gap: 5px;
}

button {
    flex: 1;
    padding: 10px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background: #007bff;
    color: white;
    font-size: 16px;
    transition: background 0.3s;
}

button:hover {
    background: #0056b3;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

#stop-btn {
    background: #dc3545;
}

#stop-btn:hover {
    background: #a71d2a;
}

#reset-btn {
    background: #6c757d;
}

#reset-btn:hover {
    background: #495057;
}