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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
    border-bottom: 1px solid #e1e4e8;
}

header h1 {
    color: #2c3e50;
    margin-bottom: 10px;
}

/* Main Content Styles */
main {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-bottom: 30px;
}

.code-input-section {
    display: flex;
    margin-bottom: 30px;
}

#codeInput {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    font-size: 16px;
}

#checkButton {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

#checkButton:hover {
    background-color: #2980b9;
}

.result-section {
    position: relative;
    min-height: 100px;
}

#resultContent {
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 4px;
    border-left: 4px solid #3498db;
}

#resultContent h2 {
    color: #2c3e50;
}

.hidden {
    display: none;
}

.spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid #3498db;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Footer Styles */
footer {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
}

/* Error Message Styles */
#errorMessage {
    color: #e74c3c;
    background-color: #fce4e4;
    padding: 10px;
    border-radius: 4px;
    border: 1px solid #e74c3c;
}