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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #f4e5c2 0%, #e8d5b0 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.calculadora {
    background: linear-gradient(145deg, #f9f0e1, #ede0ca);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 
        0 15px 30px rgba(139, 119, 93, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(139, 119, 93, 0.1);
    max-width: 400px;
    width: 100%;
}

h1 {
    text-align: center;
    color: #8b775d;
    margin-bottom: 30px;
    font-size: 28px;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.grupo-input {
    margin-bottom: 20px;
}

label {
    display: block;
    color: #6d5a47;
    margin-bottom: 8px;
    font-weight: bold;
    font-size: 14px;
}

input[type="number"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #d4c4a8;
    border-radius: 10px;
    font-size: 16px;
    background: linear-gradient(145deg, #fefbf6, #f5f0e8);
    color: #6d5a47;
    transition: all 0.3s ease;
}

input[type="number"]:focus {
    outline: none;
    border-color: #c4a882;
    box-shadow: 0 0 0 3px rgba(196, 168, 130, 0.2);
    background: #ffffff;
}

.botones {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 25px 0;
}

button {
    padding: 15px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(145deg, #d4c4a8, #c4b596);
    color: #6d5a47;
    box-shadow: 
        0 4px 8px rgba(139, 119, 93, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(139, 119, 93, 0.1);
}

button:hover {
    background: linear-gradient(145deg, #c4b596, #b4a584);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(139, 119, 93, 0.3);
}

button:active {
    transform: translateY(0);
    box-shadow: 
        0 2px 4px rgba(139, 119, 93, 0.3),
        inset 0 2px 4px rgba(139, 119, 93, 0.2);
}

.suma { 
    background: linear-gradient(145deg, #e8dcc0, #d8cc9f); 
}

.resta { 
    background: linear-gradient(145deg, #e0d4b8, #d0c4a6); 
}

.multiplicacion { 
    background: linear-gradient(145deg, #dcc9a8, #ccb996); 
}

.division { 
    background: linear-gradient(145deg, #d8c5a4, #c8b594); 
}

.suma:hover { 
    background: linear-gradient(145deg, #d8cc9f, #c8bc8f); 
}

.resta:hover { 
    background: linear-gradient(145deg, #d0c4a6, #c0b496); 
}

.multiplicacion:hover { 
    background: linear-gradient(145deg, #ccb996, #bca986); 
}

.division:hover { 
    background: linear-gradient(145deg, #c8b594, #b8a584); 
}

#resultado {
    border-color: #d4c4a8;
    background: linear-gradient(145deg, #f0e6d2, #e6dcc8);
    color: #6d5a47;
    box-shadow: inset 0 2px 4px rgba(139, 119, 93, 0.1);
}