:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #dbeafe;
    --white: #ffffff;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    --primary: #2a5ee6;
    --primary-dark: #1a4bc4;
    --white: #ffffff;
    --black: #121212;
    --silver: rgba(192, 192, 192, 0.9);
    --gray-100: #f5f7fa;
    --gray-200: #e4e7eb;
    --gray-500: #64748b;
    --gray-700: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 8px;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--silver);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
    padding: 1.5rem 0;
    backdrop-filter: blur(5px);
}

.header.scrolled {
    padding: 1rem 0;
    background-color: rgba(192, 192, 192, 0.7);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    transform: translateY(-2px);
}

.logo-img {
    height: 50px;
    width: auto;
    transition: var(--transition);
    margin-right: 15px;
}

.header.scrolled .logo-img {
    height: 40px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
    transition: var(--transition);
}

.header.scrolled .logo-text {
    font-size: 1.3rem;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 2rem;
    position: relative;
}

.nav-links a {
    text-decoration: none;
    color: var(--black);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background: var(--primary);
    bottom: -5px;
    left: 0;
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--black);
    cursor: pointer;
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    color: var(--primary);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--silver);
    backdrop-filter: blur(10px);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    z-index: 1100;
    transition: var(--transition);
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.mobile-menu-logo {
    display: flex;
    align-items: center;
}

.mobile-menu-logo img {
    height: 40px;
    width: auto;
    margin-right: 10px;
}

.mobile-menu-logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--black);
}

.mobile-menu-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--black);
    cursor: pointer;
    transition: var(--transition);
}

.mobile-menu-close:hover {
    color: var(--primary);
    transform: rotate(90deg);
}

.mobile-nav-links {
    list-style: none;
    flex: 1;
}

.mobile-nav-links li {
    margin-bottom: 1.5rem;
}

.mobile-nav-links a {
    text-decoration: none;
    color: var(--black);
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    display: block;
    padding: 0.5rem 0;
}

.mobile-nav-links a:hover {
    color: var(--primary);
}

.mobile-menu-footer {
    padding-top: 1rem;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1050;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

 /* Responsive Styles */
 @media (max-width: 992px) {
    .nav-links li {
        margin-left: 1.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 576px) {
    .header-container {
        padding: 0 1.5rem;
    }

    .logo-img {
        height: 40px;
    }

    .logo-text {
        font-size: 1.2rem;
    }

    .header.scrolled .logo-img {
        height: 35px;
    }

    .header.scrolled .logo-text {
        font-size: 1.1rem;
    }

    .footer-container {
        grid-template-columns: 1fr;
    }

    .footer-about {
        font-size: 0.95rem;
    }
}

@media (max-width: 400px) {
    .logo-text {
        display: none;
    }
}
/* Основной контент */
.main-content {
    max-width: 900px;
    margin: 50px auto;
    padding: 0 20px;
}

.water-systems-intro {
    margin-bottom: 50px;
}

.page-title {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
}

.page-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2ecc71);
}

.info-card {
    background: white;
    border-radius: 8px;
    padding: 40px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.05);
    margin-bottom: 40px;
}

.info-section {
    margin-bottom: 30px;
}

.info-section h2 {
    color: #2980b9;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.info-section p {
    margin-bottom: 15px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.feature-item {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 6px;
    border-left: 4px solid #3498db;
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.feature-item h3 {
    color: #2c3e50;
    margin-top: 0;
}



@media (max-width: 768px) {
    .page-title {
        font-size: 2rem;
    }
    
    .info-card {
        padding: 25px;
    }
}










/* Content Sections */
.section {
    padding: 6rem 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary);
    margin: 1rem auto 0;
    border-radius: 2px;
}

.content-block {
    max-width: 800px;
    margin: 0 auto 4rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.content-block.visible {
    opacity: 1;
    transform: translateY(0);
}

.content-block h2 {
    font-size: 1.5rem;
    color: var(--primary-dark);
    margin-bottom: 1.5rem;
}

.content-block p {
    margin-bottom: 1.5rem;
    color: var(--gray-700);
    font-size: 1.1rem;
    line-height: 1.7;
}

.content-block ul, 
.content-block ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.content-block li {
    margin-bottom: 0.5rem;
    color: var(--gray-700);
}

.highlight {
    background-color: var(--primary-light);
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    color: var(--primary-dark);
    font-weight: 500;
}

/* Divider */
.divider {
    height: 1px;
    background-color: var(--gray-200);
    margin: 3rem auto;
    max-width: 800px;
}

/* Footer Styles */
.footer {
    background-color: var(--black);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.footer-logo img {
    height: 50px;
    width: auto;
    margin-right: 15px;
}

.footer-logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
}

.footer-about {
    color: var(--gray-200);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--white);
    text-decoration: none;
}

.social-link:hover {
    background-color: var(--primary);
    transform: translateY(-3px);
}

.footer-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.8rem;
    color: var(--white);
}

.footer-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: var(--gray-200);
    text-decoration: none;
    transition: var(--transition);
    display: block;
}

.footer-links a:hover {
    color: var(--primary);
    transform: translateX(5px);
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1rem;
    color: var(--gray-200);
}

.footer-contact-icon {
    margin-right: 0.8rem;
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 3rem;
    margin-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-200);
    font-size: 0.9rem;
}

.footer-bottom a {
    color: var(--primary);
    text-decoration: none;
}

/* Back to Top */
.back-to-top {
position: fixed;
bottom: 2rem;
right: 2rem;
width: 50px;
height: 50px;
background: #1a4bc4;
color: var(--white);
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
font-size: 1.2rem;
cursor: pointer;
opacity: 0;
visibility: hidden;
transition: var(--transition);
z-index: 999;
box-shadow: var(--shadow-md);
}

.back-to-top.visible {
opacity: 1;
visibility: visible;
}

.back-to-top:hover {
transform: translateY(-5px) scale(1.1);
}

/* Responsive Styles */
@media (max-width: 992px) {
    .nav-links li {
        margin-left: 1.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 576px) {
    .header-container {
        padding: 0 1.5rem;
    }

    .logo-img {
        height: 40px;
    }

    .logo-text {
        font-size: 1.2rem;
    }

    .header.scrolled .logo-img {
        height: 35px;
    }

    .header.scrolled .logo-text {
        font-size: 1.1rem;
    }

    .footer-container {
        grid-template-columns: 1fr;
    }

    .footer-about {
        font-size: 0.95rem;
    }
}

@media (max-width: 400px) {
    .logo-text {
        display: none;
    }
}
/* Анимации */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


.copyright {
    opacity: 0.7;
    font-size: 0.9rem;
}



/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .content-block {
        margin-bottom: 3rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
   
    
    .section-title {
        font-size: 1.75rem;
    }
}


.copyright {
    opacity: 0.7;
    font-size: 0.9rem;
}



/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .content-block {
        margin-bottom: 3rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
   
    
    .section-title {
        font-size: 1.75rem;
    }
}