/* =========================================
   1. БАЗОВЫЕ НАСТРОЙКИ
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-color: #0056b3;
    --text-color: #333333;
    --bg-color: #f8f9fa;
    --white: #ffffff;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative; /* Для интерактивного фона */
}

/* =========================================
   2. МАГИЯ ФОНА (Свечение и Созвездия)
   ========================================= */
/* Эффект свечения за мышкой */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: -1;
    background: radial-gradient(
        600px circle at var(--mouse-x, 50%) var(--mouse-y, -200%), 
        rgba(0, 86, 179, 0.04), 
        transparent 40%
    );
}

/* Холст для летающих точек */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2; 
    pointer-events: none;
}

/* =========================================
   3. КАРКАС И БЛОКИ САЙТА
   ========================================= */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Шапка сайта */
.header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 20px 0;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-link {
    margin-left: 20px;
    text-decoration: none;
    color: var(--text-color);
    transition: color 0.3s;
}

.nav-link:hover { color: var(--primary-color); }

/* Главные экраны страниц */
.hero, .page-section {
    text-align: center;
    padding: 80px 0;
    margin-bottom: 40px;
}

.hero-title, .section-title {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.hero-subtitle, .section-subtitle {
    font-size: 20px;
    margin-bottom: 30px;
    color: #666;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Кнопка */
.btn {
    display: inline-block;
    padding: 15px 30px;
    background-color: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

.btn:hover { background-color: #004494; transform: scale(1.05); }

/* Карточки услуг и преимуществ */
.features, .services-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 60px;
    justify-content: center;
}

.feature-card, .service-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: 8px;
    flex: 1;
    min-width: 300px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover, .service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.feature-card h3, .service-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* Форма контактов */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.form-group { display: flex; flex-direction: column; text-align: left; }
.form-group label { margin-bottom: 5px; font-weight: bold; }
.form-group input, .form-group textarea {
    padding: 12px; border: 1px solid #ddd; border-radius: 5px; font-size: 16px; transition: border-color 0.3s;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary-color); outline: none; }
.form-group textarea { resize: vertical; min-height: 120px; }

/* Подвал */
.footer {
    text-align: center;
    padding: 20px 0;
    background-color: var(--text-color);
    color: var(--white);
    margin-top: auto;
}

/* =========================================
   4. АНИМАЦИИ (Выплывание текста)
   ========================================= */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-up { animation: fadeInUp 0.8s ease-out forwards; opacity: 0; }
.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* =========================================
   5. АДАПТИВНОСТЬ (Телефоны и планшеты)
   ========================================= */
@media (max-width: 768px) {
    .hero-title, .section-title { font-size: 32px; }
    .hero-subtitle, .section-subtitle { font-size: 16px; }
    
    .header-container { flex-direction: column; gap: 15px; }
    .nav-link { margin: 0 10px; font-size: 14px; }
    
    .hero, .page-section { padding: 40px 0; }
    
    /* Жестко выстраиваем карточки в столбик */
    .features, .services-grid {
        flex-direction: column;
        align-items: center;
    }
    
    .feature-card, .service-card {
        min-width: 100%;
        width: 100%;
    }
}