:root {
    --primary-color: #333;
    --secondary-color: #666;
    --border-color: #ddd;
    --background-light: #f9f9f9;
}

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

body {
    font-family: 'Times New Roman', serif;
    line-height: 1.6;
    margin: 20px;
    max-width: 100%;
    text-align: justify;
    color: var(--primary-color);
    font-size: 16px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.udk, .udc {
    text-align: right;
    font-weight: bold;
    margin-bottom: 20px;
    font-size: 14px;
}

h1 {
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    text-transform: uppercase;
    margin-bottom: 20px;
    line-height: 1.4;
}

.authors {
    text-align: center;
    margin-bottom: 10px;
    line-height: 1.5;
}

.contacts {
    text-align: center;
    font-size: 14px;
    margin-bottom: 10px;
    line-height: 1.5;
}

.affiliation {
    text-align: center;
    font-style: italic;
    margin-bottom: 20px;
}

.abstract, .keywords {
    margin-bottom: 20px;
    padding: 15px;
    background-color: var(--background-light);
    border-radius: 5px;
}

.abstract h2, .keywords h2 {
    font-size: 16px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 10px;
}

.abstract p, .keywords p {
    margin: 0;
}

.abstract p:first-of-type, .keywords p:first-of-type {
    font-weight: bold;
}

.section {
    margin-bottom: 20px;
}

.section h2 {
    font-size: 16px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 15px;
    line-height: 1.4;
}

.section p {
    margin-bottom: 15px;
    text-indent: 20px;
}

.formula {
    text-align: center;
    margin: 20px 0;
    font-style: italic;
    padding: 10px;
}

.center {
    text-align: center;
    margin: 20px 0;
}

.italic {
    font-style: italic;
}

.image-placeholder {
    text-align: center;
    margin: 20px 0;
    font-style: italic;
    color: var(--secondary-color);
    padding: 20px;
    border: 1px dashed var(--border-color);
}

.figure {
    text-align: center;
    margin: 20px 0;
}

.figure img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--border-color);
}

.figure-caption {
    font-style: italic;
    margin-top: 10px;
    font-size: 14px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    font-size: 14px;
    overflow-x: auto;
    display: block;
}

th, td {
    border: 1px solid var(--border-color);
    padding: 10px 8px;
    text-align: left;
}

th {
    background-color: var(--background-light);
    text-align: center;
    font-weight: bold;
}

.references {
    margin-top: 30px;
}

.references h2 {
    font-size: 16px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 15px;
}

.reference-item {
    margin-bottom: 10px;
    padding-left: 20px;
    text-indent: -20px;
    font-size: 14px;
}

.page-number {
    text-align: center;
    font-style: italic;
    margin: 20px 0;
    font-size: 14px;
}

ol, ul {
    padding-left: 20px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 10px;
}

/* Адаптивные стили для мобильных устройств */
@media (max-width: 768px) {
    body {
        margin: 10px;
        font-size: 14px;
        text-align: left;
    }
    
    h1 {
        font-size: 16px;
    }
    
    .authors, .contacts, .affiliation {
        text-align: left;
    }
    
    .udk, .udc {
        text-align: left;
    }
    
    table {
        font-size: 12px;
    }
    
    th, td {
        padding: 8px 5px;
    }
    
    .abstract, .keywords {
        padding: 10px;
    }
    
    .section p {
        text-indent: 15px;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 13px;
        margin: 5px;
    }
    
    h1 {
        font-size: 14px;
    }
    
    .abstract h2, .keywords h2, .section h2, .references h2 {
        font-size: 14px;
    }
    
    th, td {
        padding: 6px 4px;
        font-size: 11px;
    }
    
    .reference-item {
        font-size: 12px;
    }
    
    .figure-caption, .page-number {
        font-size: 12px;
    }
    
    .section p {
        text-indent: 10px;
    }
}

/* Стили для печати */
@media print {
    body {
        margin: 0;
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .container {
        max-width: 100%;
    }
    
    .abstract, .keywords {
        background-color: white;
        border: 1px solid #000;
    }
    
    .figure img {
        border: 1px solid #000;
    }
    
    .image-placeholder {
        border: 1px dashed #000;
    }
}