/* ===== RESET & BASE ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --color-dark: #0a1628;
    --color-dark-secondary: #101f38;
    --color-primary: #5b8def;
    --color-primary-hover: #4a7de0;
    --color-primary-light: rgba(91, 141, 239, 0.10);
    --color-primary-glow: rgba(91, 141, 239, 0.20);
    --color-accent: #38bdf8;
    --color-white: #ffffff;
    --color-gray-50: #f4f6fa;
    --color-gray-100: #e9edf5;
    --color-gray-200: #d4dae8;
    --color-gray-300: #b0bacc;
    --color-gray-400: #8892a4;
    --color-gray-500: #636b7c;
    --color-gray-600: #47505e;
    --color-gray-700: #2d3542;
    --color-gray-800: #1a212e;
    --color-telegram: #2AABEE;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --shadow-sm: 0 1px 3px rgba(10, 22, 40, 0.06);
    --shadow-md: 0 4px 16px rgba(10, 22, 40, 0.08);
    --shadow-lg: 0 12px 40px rgba(10, 22, 40, 0.12);
    --shadow-xl: 0 24px 64px rgba(10, 22, 40, 0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: var(--font-sans);
    color: var(--color-gray-700);
    background: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul, ol { list-style: none; }

.container { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 24px; }

/* ===== SECTION ===== */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
    display: inline-block; font-size: 13px; font-weight: 700; text-transform: uppercase;
    letter-spacing: 2.5px; color: var(--color-primary); background: var(--color-primary-light);
    padding: 8px 20px; border-radius: 100px; margin-bottom: 16px;
}
.section-title {
    font-family: var(--font-sans); font-size: clamp(28px, 4vw, 42px); font-weight: 800;
    color: var(--color-dark); line-height: 1.2; margin-bottom: 16px; letter-spacing: -0.5px;
}
.section-desc { font-size: 17px; color: var(--color-gray-500); max-width: 600px; margin: 0 auto; }

/* ===== HEADER ===== */
.header {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    padding: 16px 0; transition: var(--transition); background: transparent;
}
.header.scrolled { background: rgba(255,255,255,0.94); backdrop-filter: blur(16px); box-shadow: var(--shadow-sm); padding: 10px 0; }
.header .container { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 10px; z-index: 1001; }
.logo-icon { font-size: 24px; color: var(--color-primary); display: flex; align-items: center; }
.logo-text { font-family: var(--font-sans); font-size: 22px; font-weight: 800; color: var(--color-white); letter-spacing: -0.3px; }
.header.scrolled .logo-text { color: var(--color-dark); }

.nav { display: flex; align-items: center; gap: 32px; }
.nav a { font-size: 14px; font-weight: 500; color: rgba(255,255,255,0.85); position: relative; padding: 4px 0; }
.header.scrolled .nav a { color: var(--color-gray-700); }
.nav a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--color-primary); border-radius: 2px; transition: width var(--transition); }
.nav a:hover::after { width: 100%; }

.header-right { display: flex; align-items: center; gap: 16px; z-index: 1001; }
.telegram-link {
    display: flex; align-items: center; justify-content: center; width: 40px; height: 40px;
    border-radius: 50%; background: rgba(255,255,255,0.15); color: var(--color-white);
    transition: var(--transition);
}
.telegram-link:hover { background: var(--color-telegram); transform: scale(1.08); }
.header.scrolled .telegram-link { background: var(--color-gray-100); color: var(--color-telegram); }
.header.scrolled .telegram-link:hover { background: var(--color-telegram); color: var(--color-white); }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    font-family: var(--font-sans); font-weight: 600; border-radius: 100px;
    cursor: pointer; transition: var(--transition); border: none; white-space: nowrap;
}
.btn-sm { padding: 10px 22px; font-size: 13px; }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-primary { background: var(--color-primary); color: var(--color-white); box-shadow: 0 4px 20px rgba(91,141,239,0.35); }
.btn-primary:hover { background: var(--color-primary-hover); box-shadow: 0 6px 28px rgba(91,141,239,0.45); transform: translateY(-1px); }
.btn-white { background: var(--color-white); color: var(--color-dark); box-shadow: var(--shadow-md); }
.btn-white:hover { box-shadow: var(--shadow-lg); transform: translateY(-1px); }
.btn-outline-white { background: transparent; color: var(--color-white); border: 2px solid rgba(255,255,255,0.4); }
.btn-outline-white:hover { border-color: var(--color-white); background: rgba(255,255,255,0.08); }
.btn-telegram { background: var(--color-telegram); color: var(--color-white); box-shadow: 0 4px 16px rgba(42,171,238,0.35); }
.btn-telegram:hover { background: #2299d6; box-shadow: 0 6px 24px rgba(42,171,238,0.50); transform: translateY(-1px); }
.btn-full { width: 100%; }

/* Burger */
.burger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; z-index: 1001; padding: 4px; }
.burger span { display: block; width: 26px; height: 2.5px; background: var(--color-white); border-radius: 2px; transition: var(--transition); }
.header.scrolled .burger span { background: var(--color-dark); }
.burger.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ===== HERO ===== */
.hero {
    min-height: 100vh; display: flex; align-items: center; position: relative;
    overflow: hidden; background: var(--color-dark); color: var(--color-white); padding-top: 80px;
}
.hero-bg { position: absolute; inset: 0; overflow: hidden; }
.hero-bg-shape { position: absolute; border-radius: 50%; filter: blur(100px); opacity: 0.12; }
.shape-1 { width: 700px; height: 700px; background: var(--color-primary); top: -200px; right: -150px; animation: float 8s ease-in-out infinite; }
.shape-2 { width: 500px; height: 500px; background: var(--color-accent); bottom: -150px; left: -100px; animation: float 10s ease-in-out infinite reverse; }
@keyframes float { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(30px,-20px) scale(1.05); } }

.hero-content { position: relative; z-index: 1; max-width: 700px; padding: 40px 0; }
.hero-overline { font-size: 14px; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; color: var(--color-accent); margin-bottom: 24px; }
.hero-title { font-family: var(--font-sans); font-size: clamp(38px, 6vw, 64px); font-weight: 900; line-height: 1.08; margin-bottom: 24px; letter-spacing: -1.5px; }
.hero-accent { color: var(--color-primary); }
.hero-subtitle { font-size: 18px; color: var(--color-gray-300); line-height: 1.7; margin-bottom: 40px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 60px; }
.hero-stats { display: flex; align-items: center; gap: 24px; }
.stat { text-align: center; }
.stat-value { display: block; font-family: var(--font-sans); font-size: 36px; font-weight: 800; color: var(--color-primary); line-height: 1; }
.stat-label { display: block; font-size: 13px; color: var(--color-gray-400); margin-top: 4px; }
.stat-divider { width: 1px; height: 48px; background: rgba(255,255,255,0.12); }

/* ===== BENEFITS ===== */
.benefits-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.benefit-card {
    background: var(--color-white); border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg); padding: 36px 28px; transition: var(--transition);
}
.benefit-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.benefit-icon {
    width: 56px; height: 56px; display: flex; align-items: center; justify-content: center;
    background: var(--color-primary-light); color: var(--color-primary); border-radius: var(--radius-md);
    margin-bottom: 20px;
}
.benefit-card h3 { font-size: 18px; font-weight: 700; color: var(--color-dark); margin-bottom: 8px; }
.benefit-card p { font-size: 14px; color: var(--color-gray-500); line-height: 1.6; }

/* ===== BRANDS ===== */
.brands { background: var(--color-dark); color: var(--color-white); }
.brands .section-title { color: var(--color-white); }
.brands .section-desc { color: var(--color-gray-400); }
.brands-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.brand-card {
    text-align: center; padding: 32px 20px; background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-lg); transition: var(--transition);
}
.brand-card:hover { background: rgba(255,255,255,0.08); border-color: var(--color-primary); transform: translateY(-4px); }
.brand-monogram {
    width: 64px; height: 64px; display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px; font-family: var(--font-sans); font-size: 28px; font-weight: 800;
    color: var(--color-primary); background: var(--color-primary-glow); border-radius: 50%;
}
.brand-name { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.brand-desc { font-size: 13px; color: var(--color-gray-400); line-height: 1.5; }

/* ===== ABOUT ===== */
.about-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-image-placeholder {
    width: 100%; aspect-ratio: 4/3; background: var(--color-gray-100); border-radius: var(--radius-xl);
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
    color: var(--color-gray-400); border: 2px dashed var(--color-gray-200);
}
.about-content .section-title { text-align: left; }
.about-text { font-size: 15px; color: var(--color-gray-600); line-height: 1.8; margin-bottom: 16px; }
.about-points { margin: 24px 0; display: flex; flex-direction: column; gap: 12px; }
.about-point { display: flex; align-items: flex-start; gap: 10px; font-size: 15px; color: var(--color-gray-700); }
.about-point-icon { color: var(--color-primary); font-weight: 700; flex-shrink: 0; margin-top: 2px; }
.about-owner { display: flex; align-items: center; gap: 14px; margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--color-gray-200); }
.owner-avatar {
    width: 48px; height: 48px; border-radius: 50%; background: var(--color-primary); color: var(--color-white);
    display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: 700; flex-shrink: 0;
}
.owner-name { display: block; font-size: 16px; font-weight: 600; color: var(--color-dark); }
.owner-role { display: block; font-size: 13px; color: var(--color-gray-500); }

/* ===== SHOWROOM ===== */
.showroom-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}
.showroom-images {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.showroom-images img {
    width: 100%;
    border-radius: var(--radius-lg);
    object-fit: cover;
    aspect-ratio: 16/10;
    transition: var(--transition);
}
.showroom-images img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}
.showroom-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.showroom-text p {
    font-size: 15px;
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: 12px;
}
.showroom-address {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 24px;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-200);
}
.address-icon {
    font-size: 28px;
    flex-shrink: 0;
}
.showroom-address h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 4px;
}
.showroom-address p {
    font-size: 14px;
    color: var(--color-gray-600);
    line-height: 1.5;
}

/* ===== SERVICES ===== */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.service-card {
    position: relative; background: var(--color-white); border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg); padding: 36px 28px 28px; transition: var(--transition); overflow: hidden;
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.service-number {
    position: absolute; top: 16px; right: 20px; font-family: var(--font-sans);
    font-size: 48px; font-weight: 800; color: var(--color-gray-100); line-height: 1; pointer-events: none;
}
.service-icon {
    width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
    background: var(--color-primary-light); color: var(--color-primary); border-radius: var(--radius-sm); margin-bottom: 16px;
}
.service-card h3 { font-size: 18px; font-weight: 700; color: var(--color-dark); margin-bottom: 8px; }
.service-card p { font-size: 14px; color: var(--color-gray-500); line-height: 1.6; }

/* ===== PROCESS ===== */
.process { background: var(--color-gray-50); }
.process-steps { max-width: 800px; margin: 0 auto; }
.step { display: flex; gap: 24px; position: relative; }
.step:not(:last-child) { padding-bottom: 32px; }
.step-marker { display: flex; flex-direction: column; align-items: center; flex-shrink: 0; }
.step-number {
    width: 44px; height: 44px; border-radius: 50%; background: var(--color-primary); color: var(--color-white);
    display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 700; flex-shrink: 0; z-index: 1;
}
.step-line { width: 2px; flex: 1; background: var(--color-primary); opacity: 0.3; margin-top: 8px; }
.step-card { background: var(--color-white); border-radius: var(--radius-md); padding: 24px; box-shadow: var(--shadow-sm); flex: 1; }
.step-icon { font-size: 24px; margin-bottom: 8px; }
.step-card h3 { font-size: 18px; font-weight: 700; color: var(--color-dark); margin-bottom: 6px; }
.step-card p { font-size: 14px; color: var(--color-gray-500); line-height: 1.6; }

/* ===== WORKS ===== */
.works-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 40px; }
.work-card {
    border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition);
    background: var(--color-white); border: 1px solid var(--color-gray-200);
}
.work-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.work-image-placeholder {
    aspect-ratio: 4/3; background: var(--color-gray-100); display: flex;
    flex-direction: column; align-items: center; justify-content: center; gap: 8px; color: var(--color-gray-400);
}
.work-info { padding: 20px; }
.work-info h3 { font-size: 16px; font-weight: 700; color: var(--color-dark); margin-bottom: 4px; }
.work-info p { font-size: 14px; color: var(--color-gray-500); }
.works-cta { text-align: center; padding: 32px; background: var(--color-gray-50); border-radius: var(--radius-lg); }
.works-cta p { font-size: 16px; color: var(--color-gray-600); margin-bottom: 16px; }

/* ===== INSTALLATION ===== */
.installation-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 40px; }
.installation-card {
    background: var(--color-white); border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg); padding: 28px; transition: var(--transition); position: relative;
}
.installation-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.install-step-badge {
    width: 32px; height: 32px; border-radius: 50%; background: var(--color-dark); color: var(--color-primary);
    display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; margin-bottom: 16px;
}
.installation-card h3 { font-size: 17px; font-weight: 700; color: var(--color-dark); margin-bottom: 8px; }
.installation-card p { font-size: 14px; color: var(--color-gray-500); line-height: 1.6; }
.installation-note {
    display: flex; align-items: flex-start; gap: 12px; padding: 20px 24px;
    background: var(--color-primary-light); border-radius: var(--radius-md); color: var(--color-primary);
}
.installation-note svg { flex-shrink: 0; margin-top: 2px; }
.installation-note p { font-size: 14px; font-weight: 500; color: var(--color-gray-700); line-height: 1.5; }
.installation-memo { text-align: center; margin-top: 32px; }
.installation-memo .btn { display: inline-flex; }

/* ===== FAQ ===== */
.faq-category { margin-bottom: 48px; }
.faq-category:last-child { margin-bottom: 0; }
.faq-category-title {
    font-family: var(--font-sans); font-size: 20px; font-weight: 700;
    color: var(--color-dark); margin-bottom: 8px; padding-left: 8px;
    border-left: 3px solid var(--color-primary);
}
.faq-category .faq-list { max-width: 780px; margin: 0 auto; }
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--color-gray-200); }
.faq-question {
    width: 100%; display: flex; align-items: center; justify-content: space-between;
    gap: 16px; padding: 22px 0; background: none; border: none; cursor: pointer;
    font-family: var(--font-sans); font-size: 16px; font-weight: 600; color: var(--color-dark);
    text-align: left; transition: var(--transition);
}
.faq-question:hover { color: var(--color-primary); }
.faq-arrow { flex-shrink: 0; transition: transform var(--transition); }
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; }
.faq-item.active .faq-answer { max-height: 800px; padding-bottom: 22px; }
.faq-answer p { font-size: 15px; color: var(--color-gray-600); line-height: 1.7; margin-bottom: 12px; }
.faq-answer p:last-child { margin-bottom: 0; }
.faq-answer ul { margin: 8px 0 16px 20px; padding: 0; list-style: disc; }
.faq-answer ul li { font-size: 14px; color: var(--color-gray-600); line-height: 1.8; margin-bottom: 4px; }
.faq-answer ul li:last-child { margin-bottom: 0; }

/* ===== CTA BANNER ===== */
.cta-banner { background: linear-gradient(135deg, var(--color-dark), var(--color-dark-secondary)); padding: 80px 0; }
.cta-content { text-align: center; color: var(--color-white); }
.cta-content h2 { font-family: var(--font-sans); font-size: clamp(28px, 4vw, 40px); font-weight: 800; margin-bottom: 16px; }
.cta-content p { font-size: 17px; color: var(--color-gray-400); max-width: 560px; margin: 0 auto 36px; line-height: 1.7; }
.cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }

/* ===== CONTACTS ===== */
.contacts-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.contacts-desc { font-size: 16px; color: var(--color-gray-600); margin-bottom: 32px; line-height: 1.7; }
.contacts-list { display: flex; flex-direction: column; gap: 20px; }
.contact-item {
    display: flex; align-items: flex-start; gap: 14px; padding: 16px;
    border-radius: var(--radius-md); background: var(--color-gray-50); transition: var(--transition);
}
a.contact-item:hover { background: var(--color-gray-100); }
.contact-icon { font-size: 22px; flex-shrink: 0; }
.contact-label { display: block; font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; color: var(--color-gray-400); margin-bottom: 2px; }
.contact-value { font-size: 15px; font-weight: 600; color: var(--color-dark); }

/* Form */
.contacts-form {
    background: var(--color-white); border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl); padding: 40px; box-shadow: var(--shadow-md);
}
.contacts-form h3 { font-family: var(--font-sans); font-size: 24px; font-weight: 800; color: var(--color-dark); margin-bottom: 8px; }
.form-subtitle { font-size: 14px; color: var(--color-gray-500); margin-bottom: 28px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--color-gray-700); margin-bottom: 6px; }
.form-group input, .form-group textarea {
    width: 100%; padding: 14px 16px; font-family: var(--font-sans); font-size: 15px;
    border: 1px solid var(--color-gray-200); border-radius: var(--radius-sm);
    background: var(--color-gray-50); transition: var(--transition); outline: none; color: var(--color-dark);
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--color-primary); background: var(--color-white); box-shadow: 0 0 0 3px var(--color-primary-light); }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--color-gray-400); }
.form-group textarea { resize: vertical; min-height: 90px; }
.form-agreement { font-size: 12px; color: var(--color-gray-400); text-align: center; margin-top: 16px; }
.form-success { text-align: center; padding: 40px 20px; }
.success-icon-wrap { font-size: 48px; margin-bottom: 16px; }
.form-success h3 { font-size: 22px; margin-bottom: 8px; }
.form-success p { color: var(--color-gray-500); }

/* ===== FOOTER ===== */
.footer { background: var(--color-dark); color: var(--color-white); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-brand .logo-text { color: var(--color-white) !important; }
.footer-brand p { font-size: 14px; color: var(--color-gray-400); line-height: 1.7; margin-top: 16px; margin-bottom: 20px; }
.footer-telegram { display: inline-flex; }
.footer h4 { font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--color-gray-300); margin-bottom: 20px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a, .footer-contacts a { font-size: 14px; color: var(--color-gray-400); transition: var(--transition); }
.footer-links a:hover, .footer-contacts a:hover { color: var(--color-primary); }
.footer-contacts p { font-size: 14px; color: var(--color-gray-400); line-height: 1.6; }
.footer-contacts { display: flex; flex-direction: column; gap: 10px; }
.footer-bottom { padding-top: 28px; border-top: 1px solid rgba(255,255,255,0.08); text-align: center; }
.footer-bottom p { font-size: 13px; color: var(--color-gray-500); }

/* ===== BACK TO TOP ===== */
.back-to-top {
    position: fixed; bottom: 32px; right: 32px; width: 48px; height: 48px;
    border-radius: 50%; background: var(--color-dark); color: var(--color-white);
    border: none; cursor: pointer; display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transition: var(--transition); z-index: 999;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--color-primary); transform: translateY(-3px); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .benefits-grid, .services-grid, .installation-grid { grid-template-columns: repeat(2, 1fr); }
    .brands-grid { grid-template-columns: repeat(3, 1fr); }
    .about-wrapper, .contacts-wrapper { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .nav {
        position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
        background: rgba(255,255,255,0.98); backdrop-filter: blur(16px);
        flex-direction: column; justify-content: center; gap: 28px;
        transform: translateY(-100%); transition: transform 0.4s cubic-bezier(0.4,0,0.2,1); z-index: 1000;
    }
    .nav.active { transform: translateY(0); }
    .nav a { font-size: 20px; color: var(--color-dark); }
    .burger { display: flex; }
}
@media (max-width: 768px) {
    .section { padding: 64px 0; }
    .hero { min-height: auto; padding: 120px 0 60px; }
    .hero-title { font-size: 34px; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .stat-divider { display: none; }
    .benefits-grid, .services-grid, .works-grid, .installation-grid { grid-template-columns: 1fr; }
    .brands-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .contacts-form { padding: 24px; }
}
@media (max-width: 480px) {
    .brands-grid { grid-template-columns: 1fr; }
    .header-right .btn { display: none; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }
}