/* ===================================
   ЭКО Мастер РФ - Системы очистки воды
   Версия: 1.0
   =================================== */

/* CSS Variables */
:root {
    --primary-color: #0891b2;
    --primary-dark: #0e7490;
    --primary-light: #06b6d4;
    --secondary-color: #06b6d4;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-light: #64748b;
    --white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;
    --border-color: #e2e8f0;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* Reset & Base Styles */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.2; margin-bottom: var(--spacing-md); color: var(--text-primary); }
h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
p { margin-bottom: var(--spacing-sm); color: var(--text-secondary); }
a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
img { max-width: 100%; height: auto; display: block; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-lg); }

.section-title {
    text-align: center; margin-bottom: var(--spacing-2xl);
    position: relative; padding-bottom: var(--spacing-md);
}
.section-title::after {
    content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
    width: 60px; height: 4px; background: var(--primary-color); border-radius: var(--radius-sm);
}

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem; font-size: var(--font-size-base); font-weight: 600;
    border-radius: var(--radius-lg); border: 2px solid transparent;
    cursor: pointer; transition: all var(--transition-base); white-space: nowrap;
}
.btn-primary { background: var(--primary-color); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-secondary { background: transparent; color: var(--primary-color); border-color: var(--primary-color); }
.btn-secondary:hover { background: var(--primary-color); color: var(--white); transform: translateY(-2px); }

/* Header */
.header {
    position: fixed; top: 0; left: 0; width: 100%;
    background: var(--white); box-shadow: var(--shadow-sm); z-index: 1000;
    transition: all var(--transition-base);
}
.header.scrolled { box-shadow: var(--shadow-md); }
.nav { display: flex; align-items: center; justify-content: space-between; padding: var(--spacing-md) var(--spacing-lg); }
.nav-brand { display: flex; align-items: center; gap: var(--spacing-xs); font-size: var(--font-size-xl); font-weight: 700; color: var(--primary-color); }
.nav-brand i { font-size: 1.5rem; }
.nav-menu { display: flex; align-items: center; gap: var(--spacing-xl); }
.nav-link { font-weight: 500; color: var(--text-primary); position: relative; }
.nav-link::after {
    content: ''; position: absolute; bottom: -5px; left: 0;
    width: 0; height: 2px; background: var(--primary-color); transition: width var(--transition-base);
}
.nav-link:hover::after { width: 100%; }
.nav-toggle { display: none; font-size: 1.5rem; cursor: pointer; color: var(--primary-color); }

/* Hero */
.hero { padding: 120px 0 80px; background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 100%); margin-top: 70px; }
.hero-content { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-2xl); align-items: center; }
.hero-text { animation: fadeInUp 0.8s ease; }
.hero-title { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: var(--spacing-md); }
.hero-subtitle { font-size: var(--font-size-lg); color: var(--text-secondary); margin-bottom: var(--spacing-xl); line-height: 1.8; }
.hero-buttons { display: flex; gap: var(--spacing-md); flex-wrap: wrap; }
.hero-image { display: flex; justify-content: center; animation: fadeInRight 0.8s ease; }
.hero-card {
    background: var(--white); padding: var(--spacing-xl); border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl); text-align: center; max-width: 350px;
}
.hero-card i { font-size: 4rem; color: var(--primary-color); margin-bottom: var(--spacing-md); }
.hero-card p { color: var(--text-light); }

/* Services */
.services { padding: 80px 0; background: var(--white); }
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--spacing-xl); }
.service-card {
    background: var(--bg-light); padding: var(--spacing-xl); border-radius: var(--radius-xl);
    text-align: center; transition: all var(--transition-base); border: 2px solid transparent;
}
.service-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); background: var(--white); }
.service-card i { font-size: 3rem; color: var(--primary-color); margin-bottom: var(--spacing-md); }
.service-card p { color: var(--text-secondary); line-height: 1.7; }

/* About */
.about { padding: 80px 0; background: var(--bg-light); }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-2xl); align-items: center; }
.about-description { font-size: var(--font-size-lg); color: var(--text-secondary); margin-bottom: var(--spacing-xl); line-height: 1.8; }
.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-lg); margin-bottom: var(--spacing-xl); }
.stat { text-align: center; padding: var(--spacing-md); background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.stat-number { display: block; font-size: var(--font-size-3xl); font-weight: 700; color: var(--primary-color); margin-bottom: var(--spacing-xs); }
.stat-label { display: block; font-size: var(--font-size-sm); color: var(--text-light); }
.about-features { display: flex; flex-direction: column; gap: var(--spacing-md); }
.feature { display: flex; align-items: center; gap: var(--spacing-sm); color: var(--text-secondary); }
.feature i { color: var(--primary-color); font-size: 1.25rem; }
.image-placeholder {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    padding: var(--spacing-2xl); border-radius: var(--radius-2xl);
    display: flex; align-items: center; justify-content: center; min-height: 400px; box-shadow: var(--shadow-xl);
}
.image-placeholder i { font-size: 8rem; color: var(--white); opacity: 0.5; }

/* Portfolio */
.portfolio { padding: 80px 0; background: var(--white); }
.portfolio-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--spacing-xl); }
.portfolio-item {
    background: var(--white); border-radius: var(--radius-xl); overflow: hidden;
    box-shadow: var(--shadow-md); transition: all var(--transition-base);
}
.portfolio-item:hover { transform: translateY(-10px); box-shadow: var(--shadow-xl); }
.portfolio-image {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    padding: var(--spacing-2xl); display: flex; align-items: center; justify-content: center; height: 250px;
}
.portfolio-image i { font-size: 5rem; color: var(--white); opacity: 0.8; }
.portfolio-content { padding: var(--spacing-lg); }
.portfolio-content p { color: var(--text-light); }

/* Contact */
.contact { padding: 80px 0; background: var(--bg-light); }
.contact-content { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-2xl); }
.contact-info h3, .contact-form h3 { margin-bottom: var(--spacing-xl); }
.contact-item { display: flex; gap: var(--spacing-md); margin-bottom: var(--spacing-lg); }
.contact-item i { font-size: 1.5rem; color: var(--primary-color); margin-top: 0.25rem; flex-shrink: 0; }
.contact-item strong { display: block; margin-bottom: var(--spacing-xs); }
.contact-item a { color: var(--primary-color); }
.contact-item a:hover { text-decoration: underline; }
.contact-form { background: var(--white); padding: var(--spacing-xl); border-radius: var(--radius-xl); box-shadow: var(--shadow-md); }
.form-group { margin-bottom: var(--spacing-md); }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 0.875rem 1rem; border: 2px solid var(--border-color);
    border-radius: var(--radius-md); font-family: inherit; font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: var(--text-primary); }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none; border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* Footer */
.footer { background: var(--text-primary); color: var(--white); padding: var(--spacing-2xl) 0 var(--spacing-lg); }
.footer-content { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-xl); align-items: center; margin-bottom: var(--spacing-lg); }
.footer-brand { display: flex; align-items: center; gap: var(--spacing-xs); font-size: var(--font-size-xl); font-weight: 700; }
.footer-links { display: flex; gap: var(--spacing-lg); justify-content: center; }
.footer-links a { color: var(--white); opacity: 0.8; transition: opacity var(--transition-fast); }
.footer-links a:hover { opacity: 1; }
.footer-social { display: flex; gap: var(--spacing-md); justify-content: flex-end; }
.footer-social a {
    display: flex; align-items: center; justify-content: center;
    width: 40px; height: 40px; background: rgba(255,255,255,0.1);
    border-radius: 50%; transition: all var(--transition-base);
}
.footer-social a:hover { background: var(--primary-color); transform: translateY(-3px); }
.footer-bottom { text-align: center; padding-top: var(--spacing-lg); border-top: 1px solid rgba(255,255,255,0.1); }
.footer-bottom p { opacity: 0.7; margin: 0; color: var(--white); }

/* Animations */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInLeft { from { opacity: 0; transform: translateX(-30px); } to { opacity: 1; transform: translateX(0); } }
@keyframes fadeInRight { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: translateX(0); } }

/* Responsive */
@media (max-width: 992px) {
    .hero-content, .about-content, .contact-content { grid-template-columns: 1fr; gap: var(--spacing-xl); }
    .hero-image, .about-image { order: -1; }
    .footer-content { grid-template-columns: 1fr; text-align: center; gap: var(--spacing-lg); }
    .footer-links { flex-wrap: wrap; }
    .footer-social { justify-content: center; }
}
/* Compliance: согласие ПДн и дисклеймеры */
.form-consent { margin: 1rem 0 0.5rem; font-size: 0.85rem; color: var(--text-secondary); }
.form-consent input[type="checkbox"] { margin-right: 0.5rem; width: auto; }
.form-consent a { color: var(--primary-color); text-decoration: underline; }
.form-disclaimer { font-size: 0.75rem; color: var(--text-light); margin-top: 0.5rem; line-height: 1.4; }
.footer-legal { font-size: 0.75rem; color: var(--text-light); margin-top: 0.3rem; }
.nav-lang { font-size: 0.9rem; padding: 0.3rem 0.8rem; border: 1px solid var(--border-color); border-radius: var(--radius-md); }
.nav-lang:hover { background: var(--bg-gray); }

/* Legal page */
.legal-page h2 { font-size: 1.25rem; margin: 2rem 0 0.75rem; color: var(--text-primary); }
.legal-page p, .legal-page li { line-height: 1.7; color: var(--text-secondary); margin-bottom: 0.5rem; }
.legal-page ul { padding-left: 1.5rem; margin-bottom: 1rem; }
.legal-page a { color: var(--primary-color); }

@media (max-width: 768px) {
    :root { --font-size-4xl: 2rem; --font-size-3xl: 1.75rem; }
    .nav-menu { position: fixed; top: 70px; right: -100%; width: 100%; height: calc(100vh - 70px); background: var(--white); flex-direction: column; padding: var(--spacing-xl); gap: var(--spacing-lg); box-shadow: var(--shadow-lg); transition: right var(--transition-base); overflow-y: auto; }
    .nav-menu.active { right: 0; }
    .nav-toggle { display: block; }
    .hero { padding: 80px 0 60px; }
    .hero-buttons { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
    .about-stats { grid-template-columns: 1fr; }
    .services-grid, .portfolio-grid { grid-template-columns: 1fr; }
    .section-title { font-size: var(--font-size-2xl); }
}
@media (max-width: 480px) {
    .container { padding: 0 var(--spacing-sm); }
    .hero, .services, .about, .portfolio, .contact { padding: 60px 0; }
    .hero-card, .service-card, .contact-form { padding: var(--spacing-lg); }
}
@media print {
    .header, .nav-toggle, .footer-social, .contact-form { display: none; }
    body { font-size: 12pt; }
}