:root {
    --primary-blue: #6c8cff;
    --primary-purple: #a66cff;
    --soft-white: #f8f9ff;
    --container-width: 90%;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #f0f5ff 0%, #f8f0ff 100%);
    min-height: 100vh;
    padding: 2rem 1rem;
    color: #2d2d48;
}

.container {
    width: min(100%, 800px);
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 1.5rem;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
}

.matrix-controls {
    margin-bottom: 1.5rem;
}

.size-input-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
}

.matrix-size-input {
    padding: 0.5rem;
    border: 2px solid #e6e6ff;
    border-radius: 0.8rem;
    width: 80px;
    text-align: center;
    font-size: 1rem;
}

.multiply-symbol {
    font-size: 1.2rem;
    color: var(--primary-purple);
}

.matrix-grid {
    display: grid;
    gap: 0.5rem;
    margin: 1.5rem 0;
    transition: all 0.3s ease;
    overflow-x: auto;
}

.matrix-cell {
    padding: 0.8rem;
    border: 2px solid #e6e6ff;
    border-radius: 0.8rem;
    text-align: center;
    background: var(--soft-white);
    transition: transform 0.2s ease;
    font-size: 0.9rem;
    min-width: 50px;
}

.matrix-cell:focus {
    outline: none;
    border-color: var(--primary-blue);
    transform: scale(1.05);
}

.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 1rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.btn-solve {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: white;
}

.btn-clear {
    background: linear-gradient(135deg, #ff6c6c, #ff8c6c);
    color: white;
}

.btn-example {
    background: linear-gradient(135deg, #6cffb2, #6cffd8);
    color: #2d2d48;
}

.output-matrix {
    background: rgba(236, 239, 255, 0.3);
    border-radius: 1.5rem;
    padding: 1.5rem;
    margin-top: 1.5rem;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.matrix-cell.result {
    background: white;
    font-weight: 500;
    color: var(--primary-purple);
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
        border-radius: 1rem;
    }

    .size-input-group {
        flex-direction: column;
    }

    .matrix-cell {
        padding: 0.6rem;
        min-width: 40px;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .button-group {
        gap: 0.75rem;
    }
}