### `style.css`
Замените ваш файл на этот код (в него добавлены новые стили для модального окна и эффекты наведения на картинки):

```css
/* Обнуление базовых стилей */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth; 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Кнопки */
.btn {
    display: inline-block;
    background-color: #ffcc00;
    color: #111;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 4px;
    font-weight: bold;
    transition: background 0.3s, transform 0.2s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #e6b800;
}

.btn:active {
    transform: scale(0.98);
}

.btn-large {
    padding: 15px 40px;
    font-size: 1.1rem;
}

/* Секции */
.section {
    padding: 80px 0;
}

.section-dark {
    background-color: #1a1f29;
    color: #fff;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 20px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 50px;
}

.section-dark .section-subtitle {
    color: #aaa;
}

/* Шапка */
.header {
    background-color: #11141c;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid #222b3c;
}

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

.logo {
    color: #fff;
    font-size: 1.8rem;
    font-weight: bold;
    letter-spacing: 1px;
}

.nav a {
    color: #ccc;
    text-decoration: none;
    margin: 0 15px;
    font-size: 1rem;
    transition: color 0.3s;
}

.nav a:hover {
    color: #ffcc00;
}

/* Главный экран */
.hero {
    background: linear-gradient(rgba(17, 20, 28, 0.85), rgba(17, 20, 28, 0.95)), 
                url('https://unsplash.com') no-repeat center center/cover;
    height: 80vh;
    display: flex;
    align-items: center;
    color: #fff;
    text-align: center;
}

.hero-container h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-container p {
    font-size: 1.5rem;
    margin-bottom: 40px;
    color: #ccc;
}

/* О компании / Преимущества */
.features-grid {
    display: flex;
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    flex: 1;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    border-top: 4px solid #ffcc00;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* Каталог */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.product-card {
    background: #242b38;
    padding: 30px;
    border-radius: 8px;
    transition: transform 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
}

.product-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.product-card h3 {
    margin-bottom: 10px;
}

.product-card p {
    color: #b0b8c4;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Управление */
.control-container {
    display: flex;
    align-items: center;
    gap: 50px;
}

.control-text h2 {
    text-align: left;
}

.control-text ul {
    list-style: none;
    margin-top: 25px;
}

.control-text li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 15px;
    font-size: 1.1rem;
    line-height: 1.5;
}

.control-text li::before {
    content: "✓";
    color: #ffcc00;
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Галерея выполненных объектов */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.portfolio-item {
    background: #242b38;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.img-wrapper {
    overflow: hidden;
    height: 220px;
    cursor: pointer;
    position: relative;
}

/* Эффект лупы при наведении на превью картинки */
.img-wrapper::after {
    content: "🔍 Просмотр";
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    font-weight: bold;
}

.img-wrapper:hover::after {
    opacity: 1;
}

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.img-wrapper:hover img {
    transform: scale(1.08);
}

.portfolio-info {
    padding: 20px;
}

.portfolio-info h4 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: #ffcc00;
}

.portfolio-info p {
    color: #b0b8c4;
    font-size: 0.95rem;
    line-height: 1.4;
}

/* Стили Модального Окна (Full-size картинка) */
.modal {
    display: none; 
    position: fixed; 
    z-index: 1000; 
    padding-top: 60px; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.9); 
}

.modal-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 900px;
    max-height: 75vh;
    object-fit: contain;
    border-radius: 4px;
    animation: zoomIn 0.3s ease;
}

@keyframes zoomIn {
    from {transform: scale(0.9); opacity: 0;}
    to {transform: scale(1); opacity: 1;}
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.modal-close:hover {
    color: #ffcc00;
}

.modal-caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 900px;
    text-align: center;
    color: #ccc;
    padding: 15px 0;
    font-size: 1.2rem;
}

/* Этапы установки */
.steps-grid {
    display: flex;
    gap: 30px;
    justify-content: space-between;
}

.step {
    flex: 1;
    position: relative;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.step-num {
    font-size: 3rem;
    font-weight: bold;
    color: rgba(255, 204, 0, 0.2);
    position: absolute;
    top: 10px;
    right: 20px;
}

.step h4 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #111;
}

/* Форма контактов и Капча */
.form {
    max-width: 500px;
    margin: 40px auto 0;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form input {
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    width: 100%;
}

.form input:focus {
    outline: 2px solid #ffcc00;
}

.captcha-container {
    background: #f0f0f0;
    padding: 15px;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-left: 4px solid #ffcc00;
}

.captcha-container label {
    font-weight: bold;
    font-size: 0.95rem;
}

.captcha-container input {
    background: #fff;
}

.form-message {
    margin-top: 10px;
    font-weight: bold;
    text-align: center;
    font-size: 1rem;
}

/* Подвал */
.footer {
    background-color: #11141c;
    color: #777;
    padding: 30px 0;
    font-size: 0.9rem;
    border-top: 1px solid #222b3c;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 15px;
}

/* Адаптивность для мобильных */
@media (max-width: 768px) {
    .header-container, .features-grid, .steps-grid, .control-container, .footer-container {
        flex-direction: column;
        text-align: center;
    }
    
    .nav {
        margin: 20px 0;
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    
    .hero-container h1 {
        font-size: 2.2rem;
    }
    
    .control-text h2 {
        text-align: center;
    }
    
    .control-text li {
        text-align: left;
    }
    
    .modal-content {
        width: 95%;
    }
}