* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #f0f2f5;
    margin: 0;
}
.container {
    text-align: center;
    background: white;
    padding: 3rem 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    max-width: 400px;
    width: 90%;
}
h1 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: #333;
}
.bell-button {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: none;
    background: #e74c3c;
    color: white;
    font-size: 2.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 5px 15px rgba(231,76,60,0.4);
    margin: 0 auto 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}
.bell-button:hover {
    background: #c0392b;
    transform: scale(1.05);
}
.bell-button:active,
.bell-button.pressed {
    background: #a93226;
    transform: scale(0.95) rotate(-5deg);
    box-shadow: 0 2px 8px rgba(231,76,60,0.6);
}
.status {
    font-size: 1.2rem;
    color: #555;
    margin-bottom: 1rem;
}
.timer {
    font-size: 2rem;
    font-weight: bold;
    color: #e74c3c;
    margin-bottom: 1.5rem;
    min-height: 3rem;
}
.history {
    margin-top: 1rem;
    max-height: 200px;
    overflow-y: auto;
    text-align: left;
}
.history h3 {
    font-size: 0.9rem;
    color: #888;
    margin-bottom: 0.5rem;
}
.history-entry {
    font-size: 0.8rem;
    padding: 0.3rem 0;
    border-bottom: 1px solid #eee;
}