:root {
    --primary: #4a6fa5;
    --secondary: #6b8cbc;
    --accent: #ff7e5f;
    --light: #f5f7fa;
    --dark: #2c3e50;
    --success: #2ecc71;
    --warning: #f39c12;
    --danger: #e74c3c;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
    color: var(--primary);
    margin-bottom: 10px;
}

.description {
    color: var(--dark);
    max-width: 800px;
    margin: 0 auto;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.input-section,
.output-section {
    background-color: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h2 {
    color: var(--primary);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

input,
textarea,
button {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

textarea {
    min-height: 100px;
    resize: vertical;
}

#unknown-attributes-message {
    color: red;
    font-size: 10px;
    line-height: 0;
    margin-top: 5px;
    visibility: hidden;
    height: 1em;
}

button {
    background-color: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--secondary);
}

.normalization-steps {
    margin-top: 20px;
}

.step {
    margin-bottom: 20px;
    padding: 15px;
    border-radius: 5px;
    background-color: #f9f9f9;
    border-left: 4px solid var(--primary);
}

.step h3 {
    margin-bottom: 10px;
    color: var(--primary);
}

.step-content {
    margin-bottom: 10px;
}

.key {
    font-weight: bold;
    color: var(--accent);
}

.closure {
    background-color: #e8f4fd;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}

.relations {
    margin-top: 10px;
}

.relation {
    background-color: #f0f7ff;
    padding: 10px;
    border-radius: 5px;
    margin: 5px 0;
}

.checks {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.check {
    padding: 8px 15px;
    border-radius: 5px;
    font-weight: bold;
}

.lossless {
    background-color: #e8f6ef;
    color: var(--success);
}

.dependency {
    background-color: #fef9e7;
    color: var(--warning);
}

.highlight {
    background-color: #fffacd;
    padding: 2px 5px;
    border-radius: 3px;
}

.error {
    color: var(--danger);
    font-weight: bold;
    margin-top: 10px;
}

.success {
    color: var(--success);
    font-weight: bold;
    margin-top: 10px;
}

.example {
    font-size: 14px;
    color: #666;
    margin-top: 5px;
}