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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Заголовок */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 0;
}

nav {
    display: flex;
    gap: 20px;
    align-items: center;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    transition: background 0.3s;
}

nav a:hover {
    background: rgba(255,255,255,0.2);
}

.admin-link {
    background: rgba(255,255,255,0.2) !important;
    border: 1px solid rgba(255,255,255,0.3);
}

/* Основной контент */
main {
    min-height: calc(100vh - 140px);
}

.hero {
    background: white;
    padding: 3rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.hero p {
    font-size: 1.2rem;
    color: #7f8c8d;
    max-width: 600px;
    margin: 0 auto;
}

/* Секция документов */
.documents {
    padding: 3rem 0;
    background: #ecf0f1;
}

.documents h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 2rem;
}

.document-card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.document-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.document-card h4 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.document-card p {
    color: #7f8c8d;
    margin-bottom: 15px;
}

.document-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.document-placeholder {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: #7f8c8d;
    font-style: italic;
}

/* Контакты */
.contact {
    padding: 3rem 0;
    background: white;
}

.contact h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.contact-info p {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

/* Подвал */
footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px 0;
}

/* PDF Viewer Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.9);
}

.modal-content {
    position: relative;
    background-color: white;
    margin: 20px auto;
    padding: 0;
    width: 90%;
    height: 90%;
    border-radius: 10px;
    overflow: hidden;
}

.modal-header {
    background: #2c3e50;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.close {
    color: white;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    background: none;
    border: none;
}

.close:hover {
    opacity: 0.7;
}

.pdf-viewer {
    width: 100%;
    height: calc(100% - 60px);
    border: none;
}

/* Адаптивность */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    nav {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .documents-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        height: 95%;
        margin: 10px auto;
    }
}

/* Анимации */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.document-card {
    animation: fadeIn 0.5s ease-out;
}

/* Loader */
.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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