body, div, input, li, p, span, td, textarea {
    font-family: arial, helvetica, sans-serif;
    font-size: 16px;
}

.calculator-container {
    background-color: white;
    width: 90%;
    max-width: 500px;
    margin: 20px auto;
    padding: 25px;
    border-radius: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.calculator-container h1 {
    color: #053b7d;
    font-size: 1.4rem;
    margin-bottom: 5px;
    text-align: center;
}

.calculator-container h1 i {
    margin-right: 10px;
}

.calculator-container .subtitle {
    color: #666;
    font-size: 1rem;
    text-align: center;
    margin-bottom: 20px;
}

.rule-explanation {
    display: flex;
    justify-content: space-around;
    margin: 20px 0;
    flex-wrap: wrap;
    gap: 10px;
}

.rule-item {
    text-align: center;
    padding: 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 10px;
    flex: 1;
    min-width: 100px;
}

.rule-number {
    display: block;
    font-size: 2rem;
    font-weight: bold;
}

.timer-display {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    margin: 20px 0;
}

#timerValue {
    font-size: 4rem;
    font-family: 'Orbitron', monospace;
    font-weight: bold;
    letter-spacing: 5px;
}

#timerLabel {
    font-size: 1rem;
    opacity: 0.8;
    margin-top: 10px;
}

.timer-display.break-mode {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.timer-display.break-mode #timerValue {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.settings-container {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 10px;
    margin: 15px 0;
}

.input-container {
    display: flex;
    flex-direction: column;
    margin-bottom: 12px;
}

.input-container:last-child {
    margin-bottom: 0;
}

.input-container label {
    font-weight: bold;
    margin-bottom: 5px;
    color: #333;
    font-size: 0.9rem;
}

.input-container input {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    border: 1px solid #cfd1d8;
    border-radius: 5px;
    outline: none;
    box-sizing: border-box;
}

.input-container input:focus {
    border-color: #053b7d;
    box-shadow: 0 0 5px rgba(5, 59, 125, 0.3);
}

#button-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
    flex-wrap: wrap;
}

#button-container button {
    padding: 12px 25px;
    border: 0;
    color: #fff;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

#startBtn {
    background: #28a745;
}

#startBtn:hover {
    background: #218838;
}

#pauseBtn {
    background: #ffc107;
    color: #333;
}

#pauseBtn:hover {
    background: #e0a800;
}

#resetBtn {
    background: #dc3545;
}

#resetBtn:hover {
    background: #c82333;
}

#stats {
    background: #e8f4f8;
    padding: 15px;
    border-radius: 10px;
    margin-top: 20px;
}

#stats p {
    margin: 8px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

#stats i {
    color: #053b7d;
}

#result {
    margin-top: 20px;
    padding: 15px;
    background-color: #d4edda;
    border-radius: 10px;
    text-align: center;
    display: none;
}

#result.show {
    display: block;
}

#result.break-alert {
    background-color: #d4edda;
    color: #155724;
    font-size: 1.2rem;
    font-weight: bold;
}

@media (max-width: 600px) {
    .calculator-container {
        width: 95%;
        padding: 15px;
    }

    #timerValue {
        font-size: 3rem;
    }

    .rule-item {
        min-width: 80px;
        padding: 8px;
    }

    .rule-number {
        font-size: 1.5rem;
    }

    #button-container {
        flex-direction: column;
    }

    #button-container button {
        width: 100%;
        justify-content: center;
    }
}