:root {
    --bg-color: #f5f5f5;
    --container-bg: white;
    --text-color: #000;
    --primary-color: #72B42C;
    --secondary-color: #818385;
    --border-color: #ddd;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --input-bg: #f9f9f9;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f5f5f5;
    --primary-color: #8ed344;
    --secondary-color: #a0a2a4;
    --border-color: #444;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --input-bg: #3d3d3d;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 15px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.logo-container {
    text-align: center;
}

.logo {
    max-width: 200px;
    height: auto;
}

.theme-switch-wrapper {
    display: flex;
    align-items: center;
}

.theme-text {
    margin-left: 10px;
    color: var(--secondary-color);
    font-size: 14px;
}

.theme-switch {
    display: inline-block;
    height: 34px;
    position: relative;
    width: 60px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
}

.slider:before {
    background-color: white;
    bottom: 4px;
    content: "";
    height: 26px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 26px;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--secondary-color);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
    background-color: var(--container-bg);
    color: var(--text-color);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

#precio-unitario {
    background-color: var(--input-bg);
    color: var(--primary-color);
    font-weight: 600;
    text-align: right;
    font-size: 18px;
}