/* Основные стили приложения */
:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --danger-color: #e74c3c;
    --success-color: #27ae60;
    --text-color: #333;
    --light-gray: #ecf0f1;
    --border-color: #bdc3c7;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f8f9fa;
}

/* Заголовки */
.page-title {
    color: var(--primary-color);
    margin-bottom: 30px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-color);
}

/* Навигация */
.main-nav {
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.nav-btn {
    display: inline-block;
    padding: 10px 20px;
    margin: 0 5px;
    background: var(--light-gray);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 6px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: var(--accent-color);
    color: white;
}

.nav-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--primary-color);
}

/* Опции сортировки */
.sort-options {
    margin: 15px 0;
    padding: 15px;
    background: white;
    border-radius: 6px;
}

.sort-btn {
    display: inline-block;
    padding: 8px 16px;
    margin: 0 3px;
    background: var(--light-gray);
    color: var(--text-color);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.9em;
}

.sort-btn.active {
    background: var(--danger-color);
    color: white;
}

/* Таблицы */
.contacts-table {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.contacts-table table {
    width: 100%;
    border-collapse: collapse;
}

.contacts-table th {
    background: var(--primary-color);
    color: white;
    padding: 12px;
    text-align: left;
}

.contacts-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-color);
}

.contacts-table tr:hover {
    background: var(--light-gray);
}

/* Пагинация */
.pages {
    margin: 25px 0;
    text-align: center;
}

.page-num {
    display: inline-block;
    padding: 8px 12px;
    margin: 0 2px;
    background: white;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.page-num.current {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Формы */
.contact-form {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.form-row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.form-group {
    flex: 1;
}

.form-group.wide {
    flex: 2;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--primary-color);
}

.form-group.required label::after {
    content: " *";
    color: var(--danger-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* Кнопки */
.btn-primary {
    background: var(--accent-color);
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s ease;
}

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

/* Списки */
.contact-selector {
    background: white;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.contact-link {
    display: inline-block;
    padding: 8px 15px;
    margin: 0 5px 5px 0;
    background: var(--light-gray);
    color: var(--text-color);
    text-decoration: none;
    border-radius: 4px;
    border: 1px solid transparent;
}

.contact-link.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--primary-color);
}

.delete-list {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.contact-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.contact-item:last-child {
    border-bottom: none;
}

.delete-btn {
    background: var(--danger-color);
    color: white;
    padding: 6px 12px;
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.9em;
    transition: background 0.3s ease;
}

.delete-btn:hover {
    background: #c0392b;
}

/* Уведомления */
.alert {
    padding: 12px 15px;
    margin: 15px 0;
    border-radius: 6px;
    font-weight: 500;
}

.alert.success {
    background: #d4edda;
    color: var(--success-color);
    border: 1px solid #c3e6cb;
}

.alert.error {
    background: #f8d7da;
    color: var(--danger-color);
    border: 1px solid #f5c6cb;
}

/* Адаптивность */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-btn {
        display: block;
        margin: 5px 0;
        text-align: center;
    }
    
    .contact-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}