:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --hopt-color: #9b59b6;
    --background-color: #ecf0f1;
    --text-color: #2c3e50;
    --border-radius: 8px;
}

body {
    margin: 0;
    padding: 20px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #2c3e50, #3498db);
    min-height: 100vh;
}

.calculator-container {
    max-width: 800px;
    margin: 20px auto;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    overflow: hidden;
}

.header {
    background: var(--primary-color);
    color: white;
    padding: 20px;
    text-align: center;
}

.header h1 {
    margin: 0;
    font-size: 24px;
}

.header p {
    margin: 10px 0 0;
    opacity: 0.8;
}

.header-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
}

.hopt-btn {
    background: var(--hopt-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: transform 0.2s;
}

.main-content {
    padding: 20px;
}

.deck-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.input-field {
    display: flex;
    flex-direction: column;
}

.input-field label {
    margin-bottom: 5px;
    color: var(--text-color);
}

.input-field input {
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
}

.cards-section {
    background: var(--background-color);
    padding: 20px;
    border-radius: var(--border-radius);
}

.table-header {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: 10px;
    padding: 10px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    margin-bottom: 10px;
}

.card-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}

.card-row input {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    width: 100%;
    box-sizing: border-box;
}

.card-controls {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

.add-btn, .calc-btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: bold;
    transition: transform 0.2s;
}

.add-btn {
    background: var(--accent-color);
    color: white;
}

.calc-btn {
    background: var(--secondary-color);
    color: white;
}

.add-btn:hover, .calc-btn:hover {
    transform: translateY(-2px);
}

.remove-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: transform 0.2s;
}

.remove-btn:hover {
    transform: scale(1.1);
}

.result-display {
    margin-top: 20px;
    padding: 20px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    text-align: center;
    font-size: 18px;
}

.probability {
    color: #2ecc71;
    font-weight: bold;
    margin-left: 10px;
}

.error-message {
    color: #e74c3c;
    font-weight: bold;
    margin-left: 10px;
}

footer {
    text-align: center;
    padding: 15px;
    background: var(--primary-color);
    color: white;
}

.example-btn {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s, transform 0.2s;
}

.example-btn:hover {
    background-color: #2980b9;
}

.hopt-btn {
    background: var(--hopt-color); 
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s, transform 0.2s;
}

.hopt-btn:hover {
    background-color: #8e44ad;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
}

.modal-content {
    position: relative;
    background-color: white;
    margin: 15% auto;
    padding: 20px;
    width: 80%;
    max-width: 600px;
    border-radius: var(--border-radius);
    max-height: 70vh;
    overflow-y: auto;
}

.close-btn {
    position: absolute;
    right: 20px;
    top: 10px;
    font-size: 24px;
    cursor: pointer;
    color: #666;
}

.hopt-btn {
    background: var(--hopt-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: transform 0.2s;
}

.hopt-btn:hover {
    transform: translateY(-2px);
    background: #8e44ad;
}

.hopt-inputs {
    display: grid;
    gap: 15px;
    margin-top: 20px;
}

.hopt-result {
    padding: 15px;
    background: var(--background-color);
    border-radius: var(--border-radius);
    margin-top: 15px;
    text-align: center;
}

@media (max-width: 768px) {
    .calculator-container {
        margin: 0 auto; 
        padding: 10px;
        width: 90%; 
        max-width: 100%;
    }

    .deck-settings, .cards-section {
        margin-top: 20px;
    }

    .table-header, .card-row {
        grid-template-columns: 2fr 0.8fr 0.8fr 0.8fr auto;
        font-size: 14px;
        gap: 5px;
    }

    .card-row input {
        padding: 12px 8px;
        font-size: 16px;
    }

    .add-btn {
        width: 100%;
        padding: 15px;
        margin-top: 20px;
    }

    .remove-btn {
        width: 30px;
        height: 30px;
    }

    .result-display {
        font-size: 16px;
        padding: 15px;
        text-align: center;
    }

    .modal-content {
        margin: 5% auto;
        width: 90%;
        max-height: 90vh;
    }

    .header-buttons {
        flex-direction: column; 
        align-items: center; 
        gap: 10px; 
    }
    
    .example-btn, .hopt-btn {
        width: 100%; 
        text-align: center;
    }
}

@media (hover: none) {
    input[type="number"] {
        -webkit-appearance: none;
        appearance: none; /* Standard-Property */
        margin: 0;
        padding: 12px;
    }

    .add-btn:active, 
    .remove-btn:active {
        transform: scale(0.95);
    }
}