/* === БАЗОВАЯ СБРОСКА === */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; overflow-x: hidden; scroll-behavior: smooth; background-color: #f9fbfd; margin: 0; padding: 0; }
img, video { max-width: 100%; height: auto; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; overflow: hidden; }
body { font-family: 'Inter', sans-serif; background: #f9fbfd; color: #333; line-height: 1.6; padding-top: 110px; }
:root { --header-height: 110px; }

/* ====== ШАПКА (TOPBAR) ====== */
.topbar { position: fixed; top: 0; left: 0; width: 100%; background: #1a2533; color: #d8e0ef; font-size: 0.9rem; padding: 8px 0; z-index: 1001; transition: transform 0.4s ease, opacity 0.4s ease; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25); margin: 0; border: none; }
body.scrolled .topbar { transform: translateY(-100%); opacity: 0; }
.topbar-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.topbar-right { display: flex; align-items: center; justify-content: center; }

/* === Контакты в шапке === */
.topbar .contact { display: flex; align-items: center; justify-content: center; gap: 6px; flex-wrap: wrap; }
.topbar .contact a { display: flex; align-items: center; gap: 6px; color: #64b5f6; text-decoration: none; font-weight: 500; transition: color 0.3s ease, background 0.3s ease, filter 0.3s ease; padding: 4px 8px; border-radius: 6px; }
.topbar .contact a:hover { color: #fff; background: rgba(255, 255, 255, 0.08); filter: drop-shadow(0 0 6px rgba(0,195,255,0.4)); }
.topbar .icon { display: inline-flex; align-items: center; justify-content: center; vertical-align: middle; }
.topbar .icon svg { width: 18px; height: 18px; fill: #007BFF !important; display: inline-block; transition: transform 0.3s ease, filter 0.3s ease; visibility: visible !important; opacity: 1 !important; }
.topbar .icon svg path { fill: inherit !important; visibility: visible !important; opacity: 1 !important; }
.topbar a:hover .icon svg { fill: #00C3FF !important; transform: scale(1.1); filter: drop-shadow(0 0 6px rgba(0,195,255,0.6)); }
.contact .address .icon svg { fill: #00b4ff !important; transition: none !important; color: initial !important; }
.contact .address:hover .icon svg { fill: #4dcfff !important; transform: scale(1.1); filter: drop-shadow(0 0 5px rgba(0, 195, 255, 0.6)); }

/* === Языки === */
.lang-switch { display: flex; align-items: center; justify-content: center; margin-left: 16px; }
.lang-btn { display: flex; align-items: center; justify-content: center; gap: 6px; background: linear-gradient(90deg, #00c3ff, #0077ff); color: #fff; font-weight: 600; border: none; border-radius: 30px; padding: 8px 16px; cursor: pointer; box-shadow: 0 0 15px rgba(0, 195, 255, 0.3); transition: all 0.35s ease; height: 30px; min-width: 64px; text-align: center; font-family: inherit; }
.lang-btn:hover { background: linear-gradient(90deg, #0077ff, #00c3ff); transform: translateY(-2px); box-shadow: 0 0 25px rgba(0, 195, 255, 0.5); }
.lang-flag { width: 18px; height: auto; border-radius: 2px; box-shadow: 0 0 2px rgba(0, 0, 0, 0.3); }

/* ==== НАВИГАЦИЯ (NAVBAR) ==== */
.navbar { position: fixed; left: 0; top: 40px; width: 100%; background: linear-gradient(90deg, #0077ff, #00c6ff); box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2); z-index: 1000; transition: top 0.4s ease; margin: 0; border: none; }
body.scrolled .navbar { top: 0; }
.nav-inner { display: flex; justify-content: space-between; align-items: center; padding: 0.8rem 1rem; max-width: 1200px; margin: auto; position: relative; }
.navbar .logo { font-size: 1.4rem; font-weight: 700; color: #fff; text-decoration: none; display: flex; align-items: center; gap: 6px; margin-left: 60px; }
.logo-icon { font-size: 1.2rem; }
.nav-links { list-style: none; display: flex; gap: 1.5rem; transition: all 0.4s ease; }
.nav-links li a { color: #d8e0ef; font-weight: 500; text-decoration: none; position: relative; transition: color 0.3s ease; }
.nav-links li a::after { content: ""; position: absolute; bottom: -5px; left: 0; width: 0%; height: 2px; background: #3ae0d7; transition: width 0.3s ease; border-radius: 2px; }
.nav-links li a:hover { color: #3ae0d7; }
.nav-links li a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 10px; }

/* === Кнопки и действия в меню === */
.cta-btn { position: relative; overflow: hidden; padding: 0.6rem 1rem; background: #ffeb3b; color: #333; font-weight: 600; border-radius: 8px; text-decoration: none; transition: all 0.3s ease; box-shadow: 0 2px 6px rgba(0,0,0,0.2); }
.cta-btn::before { content: ""; position: absolute; top: 0; left: -100%; width: 75%; height: 100%; background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent); transform: skewX(-25deg); transition: none; }
.cta-btn:hover { background: linear-gradient(135deg, #007BFF, #0056b3); box-shadow: 0 10px 28px rgba(0, 123, 255, 0.45); transform: translateY(-3px); color: #fff; }
.cta-btn:hover::before { left: 125%; transition: left 0.6s ease-in-out; }
.nav-toggle { display: none; font-size: 1.6rem; background: none; border: none; color: #fff; cursor: pointer; transition: transform 0.3s ease; }
.nav-toggle.open { transform: rotate(90deg); opacity: 0; pointer-events: none; transition: transform 0.3s ease, opacity 0.3s ease; }
.close-menu-btn { display: none; background: none; border: none; cursor: pointer; z-index: 1002; }
.nav-call { display: none; background: none; border: none; padding: 0; cursor: pointer; transition: transform 0.3s ease, filter 0.3s ease; }
.nav-call svg { width: 28px; height: 28px; fill: #0088ff; transition: transform 0.3s ease, filter 0.3s ease; }
.nav-call:hover svg { transform: scale(1.15); filter: drop-shadow(0 0 6px rgba(0,136,255,0.6)); }

/* === Мобильное меню (Mobile) === */
.mobile-contacts { display: none; flex-direction: column; gap: 10px; padding-top: 2rem; border-top: 1px solid rgba(255,255,255,0.2); margin-top: auto; }
.nav-links.open .mobile-contacts { display: flex; }
.lang-mobile { display: none; position: absolute; left: 10px; top: 50%; transform: translateY(-50%); z-index: 1001; }
.lang-mobile .lang-btn { display: flex; align-items: center; justify-content: center; width: 38px; height: 38px; border-radius: 50%; background: linear-gradient(90deg, #00c3ff, #0077ff); border: none; cursor: pointer; box-shadow: 0 0 12px rgba(0,195,255,0.4); transition: transform 0.25s ease, box-shadow 0.25s ease; }
.lang-mobile .lang-btn:hover { transform: scale(1.08); box-shadow: 0 0 18px rgba(0,195,255,0.6); }
.lang-mobile .lang-flag { width: 22px; border-radius: 3px; }

/* ====== HERO SECTION ====== */
.hero { position: relative; color: #fff; height: 100dvh; padding-top: var(--header-height); min-height: 600px; overflow: hidden; display: flex; align-items: center; justify-content: center; text-align: left; background-image: url("img/hydrogen_bg.jpg"); background-size: cover; background-position: center center; background-repeat: no-repeat; background-attachment: scroll; background-color: #0a192f; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(0, 90, 180, 0.55) 0%, rgba(10, 25, 47, 0.85) 100%); z-index: 1; }
.hero-inner { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: flex-start; gap: 24px; animation: fadeInHero 1s ease-out forwards; }
.hero-text { background: linear-gradient(135deg, rgba(10, 25, 47, 0.65) 0%, rgba(0, 60, 120, 0.55) 100%); border: 1px solid rgba(0, 180, 255, 0.6); box-shadow: 0 0 12px rgba(0, 180, 255, 0.35), inset 0 0 18px rgba(0, 180, 255, 0.12); backdrop-filter: blur(10px); border-radius: 20px; padding: clamp(20px, 4vw, 40px) clamp(24px, 5vw, 48px); max-width: 650px; transition: box-shadow 0.4s ease, background 0.4s ease; }
.hero-text:hover { box-shadow: 0 0 18px rgba(0, 200, 255, 0.6), inset 0 0 25px rgba(0, 200, 255, 0.25); background: linear-gradient(135deg, rgba(15, 35, 70, 0.95) 0%, rgba(0, 80, 160, 0.9) 100%); }
.hero h1 { font-size: clamp(1.8rem, 3.5vw, 2.7rem); margin-bottom: 12px; line-height: 1.2; text-shadow: 0 2px 10px rgba(0,0,0,0.6); }
.hero p { font-size: clamp(1rem, 1.2vw, 1.2rem); max-width: 600px; margin-bottom: 24px; color: #d9ebff; text-shadow: 0 1px 6px rgba(0,0,0,0.4); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-cta .btn { flex: 1 1 auto; min-width: 150px; max-width: 180px; text-align: center; padding: 12px 0; border-radius: 8px; text-decoration: none; font-weight: 600; transition: all .3s ease; }
.btn.primary { background: linear-gradient(90deg, #00b4ff, #007bff); color: #fff; box-shadow: 0 4px 15px rgba(0,123,255,0.4); }
.btn.primary:hover { background: linear-gradient(90deg, #0099e6, #0066cc); transform: translateY(-2px); }
.btn.ghost { border: 2px solid #fff; color: #fff; }
.btn.ghost:hover { background: #fff; color: #142d4c; transform: translateY(-2px); }

/* === Стрелка вниз === */
.scroll-down { position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%); z-index: 3; cursor: pointer; width: 32px; height: 32px; opacity: 0.9; transition: opacity 0.3s ease; }
.scroll-down:hover { opacity: 1; }
.scroll-down .arrow { position: relative; display: block; width: 100%; height: 100%; }
.scroll-down .arrow::before, .scroll-down .arrow::after { content: ''; position: absolute; left: 50%; width: 3px; height: 16px; background: linear-gradient(180deg, #00b4ff, #007bff); border-radius: 2px; transform-origin: center; animation: arrowPulse 1.6s infinite ease-in-out; box-shadow: 0 0 8px rgba(0,180,255,0.6); }
.scroll-down .arrow::before { transform: translateX(-50%) rotate(45deg); }
.scroll-down .arrow::after { transform: translateX(-50%) rotate(-45deg); }

/* ====== СЕКЦИИ ОБЩЕЕ ====== */
.section { padding: 80px 0; scroll-margin-top: 105px; }
.section.alt { background: #eef6fb; }
.section-title { text-align: center; font-size: 2.2rem; margin-bottom: 40px; }
.section h2 { font-size: 2rem; text-align: center; margin-bottom: 40px; position: relative; }
.section h2::after { content: ""; display: block; width: 80px; height: 4px; background: #00c3ff; margin: 12px auto 0; border-radius: 2px; }
.lead { text-align: center; font-size: 1.1rem; margin-bottom: 40px; color: #555; position: relative; z-index: 1; }

/* ====== WHEN SECTION ====== */
#when { text-align: center; padding: 80px 20px; background: linear-gradient(180deg, #f8fbff 0%, #eef5ff 100%); position: relative; overflow: hidden; }
#when::before { content: ""; position: absolute; top: -100px; left: 50%; transform: translateX(-50%); width: 500px; height: 500px; background: radial-gradient(circle, rgba(0,170,255,0.15) 0%, transparent 70%); z-index: 0; animation: floatGlow 10s ease-in-out infinite alternate; }
#when h2 { font-size: 2.2rem; margin-bottom: 12px; color: #0d1b2a; position: relative; z-index: 1; }
#when .lead { margin-bottom: 50px; }
.symptoms-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 28px; position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; align-items: stretch; justify-items: stretch; }
.symptom-card { display: flex; flex-direction: column; justify-content: flex-start; height: 100%; background: rgba(255, 255, 255, 0.9); border-radius: 16px; padding: 28px 22px; text-align: center; box-shadow: 0 6px 18px rgba(0,0,0,0.08); transition: transform 0.4s ease, box-shadow 0.4s ease, opacity 0.4s ease; position: relative; overflow: hidden; opacity: 0; transform: translateY(40px); }
.symptom-card.visible, .symptom-card.show { opacity: 1; transform: translateY(0); }
.symptom-card:hover { transform: translateY(-10px) scale(1.02); box-shadow: 0 10px 30px rgba(0,170,255,0.25); }
.symptom-card::after { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 50% 50%, rgba(0,170,255,0.1) 0%, transparent 60%); opacity: 0; transition: opacity 0.4s ease; z-index: 0; }
.symptom-card:hover::after { opacity: 1; }
.symptom-card .icon { font-size: 2.3rem; margin-bottom: 14px; color: #00aaff; filter: drop-shadow(0 0 6px rgba(0,170,255,0.4)); transition: transform 0.3s ease; }
.symptom-card:hover .icon { transform: scale(1.2); }
.symptom-card h3 { font-size: 1.15rem; margin-bottom: 10px; color: #142d4c; }
.symptom-card p { font-size: 0.95rem; color: #555; line-height: 1.4; }
/* Задержки анимации */
.symptom-card:nth-child(1) { transition-delay: 0.1s; }
.symptom-card:nth-child(2) { transition-delay: 0.2s; }
.symptom-card:nth-child(3) { transition-delay: 0.3s; }
.symptom-card:nth-child(4) { transition-delay: 0.4s; }
.symptom-card:nth-child(5) { transition-delay: 0.5s; }
.symptom-card:nth-child(6) { transition-delay: 0.6s; }
.symptom-card:nth-child(7) { transition-delay: 0.7s; }
.symptom-card:nth-child(8) { transition-delay: 0.8s; }

/* ====== WHAT SECTION (Two Col) ====== */
.two-col { display: flex; flex-wrap: wrap; align-items: center; gap: 40px; }
.clean-list { flex: 1 1 45%; }
.clean-image { flex: 1 1 45%; min-height: 320px; background: url("img/cleaned-by-hydrogen.png") center/contain no-repeat; }
.clean-list ul { list-style: none; padding: 0; margin: 0; }
.clean-list li { margin-bottom: 14px; padding-left: 28px; position: relative; font-size: 1.1rem; color: #333; }
.clean-list li::before { content: "✔"; position: absolute; left: 0; top: 0; color: #00aaff; font-weight: bold; }

/* ====== TECH SECTION ====== */
#tech { position: relative; overflow: hidden; padding: 100px 20px; background: linear-gradient(180deg, rgba(0,195,255,0.05) 0%, #ffffff 100%); }
#tech::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle at 1px 1px, rgba(0,195,255,0.03) 1px, transparent 0); background-size: 30px 30px; z-index: 0; pointer-events: none; }
#tech::after { content: ""; position: absolute; left: -40px; top: -40px; width: 400px; height: 400px; background: url("img/technology.png") no-repeat left top / contain; opacity: 0.3; filter: blur(0.3px); pointer-events: none; z-index: 1; }
#tech .container { position: relative; z-index: 2; max-width: 1100px; margin: 0 auto; text-align: center; }
#tech h2 { text-align: center; font-size: 2.4rem; margin-bottom: 40px; font-weight: 700; color: #0d1b2a; }
#tech .lead { text-align: center; font-size: 1.15rem; line-height: 1.6; color: #333; margin: 0 auto 60px; max-width: 800px; }
.tech-steps { display: grid; gap: 30px; }
.tech-steps article { background: #fff; border-radius: 18px; box-shadow: 0 6px 24px rgba(0,0,0,0.06); text-align: center; overflow: hidden; transition: transform 0.35s ease, box-shadow 0.35s ease; opacity: 0; transform: translateY(50px); padding: 40px 25px 30px; }
.tech-steps article::before { content: ""; display: block; width: 80px; height: 80px; margin: 0 auto 20px; border-radius: 50%; background-color: rgba(0,195,255,0.1); background-size: 40px 40px; background-repeat: no-repeat; background-position: center; transition: transform 0.4s ease, background-color 0.3s ease; }
.tech-steps article:nth-child(1)::before { background-image: url("icons/diagnostic.png"); }
.tech-steps article:nth-child(2)::before { background-image: url("icons/hydrogen.png"); }
.tech-steps article:nth-child(3)::before { background-image: url("icons/engine.png"); }
.tech-steps article:nth-child(4)::before { background-image: url("icons/check.png"); }
.tech-steps article:hover { transform: translateY(-8px); box-shadow: 0 16px 36px rgba(0,170,255,0.15); }
.tech-steps article:hover::before { transform: scale(1.15); background-color: rgba(0,195,255,0.18); }
.tech-steps h3 { font-size: 1.25rem; margin-bottom: 10px; color: #0d1b2a; font-weight: 600; }
.tech-steps p { font-size: 1rem; line-height: 1.55; color: #444; margin: 0 auto; max-width: 90%; }

/* ====== SAFETY SECTION ====== */
#safety { position: relative; overflow: hidden; padding: 100px 20px; background: linear-gradient(180deg, rgba(0,195,255,0.08) 0%, #f3f6fa 100%); color: #0d1b2a; }
#safety::before { content: ""; position: absolute; inset: 0; background: url("img/safety.jpg") center/cover no-repeat; opacity: 0.25; filter: brightness(0.6) blur(2px); z-index: 0; }
#safety::after { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle at 1px 1px, rgba(0,195,255,0.05) 1px, transparent 0); background-size: 25px 25px; opacity: 0.4; z-index: 1; pointer-events: none; }
#safety .container { position: relative; z-index: 2; max-width: 900px; margin: 0 auto; }
#safety .section-title { text-align: center; font-size: 2.6rem; margin-bottom: 50px; font-weight: 700; color: #fff; text-shadow: 0 3px 8px rgba(0,0,0,0.3); }
.safety-cards.one-col { display: flex; flex-direction: column; gap: 22px; }
.safety-card { display: flex; align-items: flex-start; background: rgba(255, 255, 255, 0.9); border-radius: 18px; padding: 20px 28px; box-shadow: 0 8px 28px rgba(0,0,0,0.06); transition: transform 0.35s ease, box-shadow 0.35s ease; opacity: 0; transform: translateY(50px); }
.safety-card:hover { transform: translateY(-5px); box-shadow: 0 14px 35px rgba(0,0,0,0.15); }
.safety-card .icon { display: inline-flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: bold; color: #00c3ff; background: #e6f7ff; border: 2px solid #00c3ff; border-radius: 50%; width: 38px; height: 38px; margin-right: 18px; flex-shrink: 0; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.safety-card:hover .icon { transform: scale(1.15) rotate(-5deg); box-shadow: 0 6px 20px rgba(0,0,0,0.15); }
.safety-card p { font-size: 1rem; line-height: 1.55; color: #0d1b2a; margin: 0; font-weight: 500; }

/* ====== RESULT SECTION ====== */
.result-grid { display: grid; gap: 30px; }
.result-card { display: flex; align-items: flex-start; gap: 16px; background: rgba(255,255,255,0.97); padding: 24px 28px; border-radius: 18px; box-shadow: 0 8px 28px rgba(0,0,0,0.06); transition: transform 0.35s ease, box-shadow 0.35s ease; opacity: 0; transform: translateY(50px); }
.result-card:hover { transform: translateY(-6px); box-shadow: 0 14px 35px rgba(0,0,0,0.12); }
.result-card .icon { flex-shrink: 0; width: 80px; height: 80px; border-radius: 50%; background: linear-gradient(135deg, #00c3ff, #0077ff); display: flex; align-items: center; justify-content: center; transition: transform 0.35s ease, box-shadow 0.35s ease; }
.result-card .icon::before { content: ""; width: 42px; height: 42px; background-size: contain; background-repeat: no-repeat; background-position: center; }
.result-card .icon:hover { transform: scale(1.15); box-shadow: 0 10px 25px rgba(0,0,0,0.18); }
.icon.engine::before { background-image: url("icons/engine-white.png"); }
.icon.fuel::before { background-image: url("icons/fuel-white.png"); }
.icon.power::before { background-image: url("icons/power-white.png"); }
.icon.emissions::before { background-image: url("icons/emissions-white.png"); }
.icon.gear::before { background-image: url("icons/gear-white.png"); }
.icon.vibration::before { background-image: url("icons/vibration-white.png"); }
.result-card h4 { font-size: 1.2rem; margin-bottom: 8px; color: #0d1b2a; font-weight: 600; }
.result-card p { font-size: 0.95rem; color: #444; line-height: 1.5; margin: 0; }

/* ====== TYPES SECTION ====== */
#types { background: linear-gradient(180deg, #f9fbfd 0%, #eef6fb 100%); position: relative; overflow: hidden; padding: 100px 20px; }
#types::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle at 1px 1px, rgba(0,195,255,0.04) 1px, transparent 0); background-size: 28px 28px; z-index: 0; pointer-events: none; }
#types .container { position: relative; z-index: 1; max-width: 1100px; margin: 0 auto; }
#types .section-title { text-align: center; font-size: 2.4rem; margin-bottom: 14px; font-weight: 700; color: #0d1b2a; }
#types .lead { text-align: center; font-size: 1.15rem; margin-bottom: 60px; color: #444; }
.types-layout { display: flex; justify-content: center; align-items: center; gap: 40px; flex-wrap: nowrap; }
.types-column { display: flex; flex-direction: column; align-items: flex-end; gap: 28px; flex: 1; min-width: 250px; max-width: 320px; }
.types-center { flex: 1; min-width: 280px; height: 340px; background: url("img/engine.png") no-repeat center/contain; background-color: transparent; display: flex; justify-content: center; align-items: center; transition: all 0.6s ease; opacity: 1; animation: float 6s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.type-item { display: flex; align-items: center; justify-content: flex-start; gap: 16px; background: rgba(255, 255, 255, 0.9); border-radius: 14px; padding: 18px 22px; width: 100%; max-width: 280px; box-shadow: 0 6px 20px rgba(0,0,0,0.06); font-size: 1.05rem; font-weight: 500; color: #0d1b2a; transition: all 0.35s ease; text-align: left; position: relative; overflow: hidden; }
.type-item:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(0,0,0,0.1); }
.type-item .icon { width: 62px; height: 62px; border-radius: 50%; background-position: center; background-size: 60%; background-repeat: no-repeat; background-color: rgba(0,195,255,0.1); flex-shrink: 0; transition: transform 0.3s ease; position: relative; z-index: 1; }
.type-item:hover .icon { transform: scale(1.1); }
.icon-moto { background-image: url("icons/moto.png"); }
.icon-car { background-image: url("icons/car.png"); }
.icon-truck { background-image: url("icons/truck.png"); }
.icon-excavator { background-image: url("icons/excavator.png"); }
.icon-boat { background-image: url("icons/boat.png"); }
.icon-generator { background-image: url("icons/generator.png"); }
/* Анимация type-item */
.type-item:hover { transform: translateY(-6px) scale(1.03); box-shadow: 0 12px 28px rgba(0, 170, 255, 0.25); }
.type-item::after { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at center, rgba(0, 195, 255, 0.15) 0%, transparent 70%); opacity: 0; transition: opacity 0.4s ease; z-index: 0; }
.type-item:hover::after { opacity: 1; }
.type-item:hover .icon { transform: scale(1.15) rotate(3deg); box-shadow: 0 0 18px rgba(0, 195, 255, 0.45); background-color: rgba(0, 195, 255, 0.12); }
.type-item span { position: relative; z-index: 1; transition: color 0.4s ease, text-shadow 0.4s ease; }
.type-item:hover span { color: #0077ff; text-shadow: 0 0 6px rgba(0, 170, 255, 0.3); }
/* Override for types-center fallback */
.types-center { background-image: url("img/engine.png"), none; background-repeat: no-repeat, no-repeat; background-position: center center, center center; background-size: contain, 40%; min-height: 250px; height: auto; width: 100%; max-width: 500px; margin: 18px auto; flex-shrink: 0; display: block !important; visibility: visible !important; position: relative; z-index: 3; }

/* ====== PRICING SECTION ====== */
#pricing { background: linear-gradient(180deg, #f9fbfd 0%, #eef6fb 100%); padding: 100px 20px; }
.pricing-grid { display: grid; gap: 28px; margin-top: 50px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.pricing-card { background: #fff; border-radius: 18px; padding: 32px 24px; text-align: center; box-shadow: 0 8px 24px rgba(0,0,0,0.08); transition: transform 0.35s ease, box-shadow 0.35s ease; display: flex; flex-direction: column; align-items: center; }
.pricing-card:hover { transform: translateY(-6px); box-shadow: 0 14px 32px rgba(0,0,0,0.12); }
.pricing-card h3 { font-size: 1.4rem; margin-bottom: 14px; font-weight: 600; color: #0d1b2a; }
.pricing-card .price { font-size: 2rem; font-weight: 700; color: #00c3ff; margin-bottom: 12px; }
.pricing-card p { font-size: 1rem; color: #555; margin-bottom: 20px; }
.pricing-card .btn { display: inline-block; padding: 12px 28px; background: linear-gradient(90deg, #00c3ff, #0077ff); color: #fff; font-weight: 600; border-radius: 50px; text-decoration: none; transition: all 0.5s ease; box-shadow: 0 4px 15px rgba(0,195,255,0.3); position: relative; overflow: hidden; animation: pulseGlow 3s infinite ease-in-out; background-size: 200% auto; }
.pricing-card .btn:hover { background-position: right center; transform: translateY(-3px); box-shadow: 0 0 25px rgba(0,195,255,0.6), 0 0 50px rgba(0,119,255,0.4); }
@keyframes pulseGlow { 0%, 100% { box-shadow: 0 4px 15px rgba(0,195,255,0.3); } 50% { box-shadow: 0 0 25px rgba(0,195,255,0.5), 0 0 40px rgba(0,119,255,0.3); } }

/* ====== FAQ SECTION ====== */
#faq { background: linear-gradient(180deg, #f9fbfd 0%, #eef6fb 100%); padding: 100px 20px; position: relative; }
#faq .section-title { text-align: center; font-size: 2.4rem; margin-bottom: 50px; font-weight: 700; color: #0d1b2a; }
.faq { max-width: 800px; margin: 0 auto; }
.qa { border-radius: 14px; margin-bottom: 16px; overflow: hidden; box-shadow: 0 4px 14px rgba(0,0,0,0.06); background: #fff; transition: box-shadow 0.3s ease; }
.qa:hover { box-shadow: 0 6px 20px rgba(0,0,0,0.12); }
.qa-q { width: 100%; text-align: left; padding: 18px 22px; font-size: 1.1rem; font-weight: 600; background: #fff; border: none; cursor: pointer; position: relative; color: #0d1b2a; display: flex; justify-content: space-between; align-items: center; transition: background 0.3s ease; }
.qa-q:hover { background: #f0f8ff; }
.qa-q .arrow { width: 18px; height: 18px; border-right: 2px solid #00c3ff; border-bottom: 2px solid #00c3ff; transform: rotate(45deg); transition: transform 0.4s ease; }
.qa.active .qa-q .arrow { transform: rotate(-135deg); }
.qa-a { max-height: 0; overflow: hidden; padding: 0 22px; font-size: 1rem; line-height: 1.6; color: #444; background: #fff; transition: max-height 0.5s ease, padding 0.4s ease; }
.qa.active .qa-a { max-height: 500px; padding: 18px 22px; }

/* ====== VIDEO SECTION ====== */
#video-reviews { position: relative; padding: 100px 20px; overflow: hidden; color: #fff; text-align: center; background: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.7)), url("img/video.jpg"); background-size: cover; background-position: center center; background-repeat: no-repeat; background-attachment: fixed; background-blend-mode: overlay; }
#video-reviews .container { position: relative; z-index: 2; max-width: 1100px; margin: 0 auto; }
#video-reviews .section-title { font-size: 1.8rem; margin-bottom: 40px; color: #00c3ff; font-weight: 600; text-shadow: 0 2px 10px rgba(0,195,255,0.25); }
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.video-card { background: rgba(255,255,255,0.06); border-radius: 16px; padding: 15px; box-shadow: 0 8px 25px rgba(0,195,255,0.1); transition: all 0.4s ease; cursor: pointer; backdrop-filter: blur(4px); }
.video-card:hover { transform: translateY(-6px); box-shadow: 0 12px 35px rgba(0,195,255,0.25); }
.video-thumb { position: relative; border-radius: 12px; overflow: hidden; }
.video-thumb img { width: 100%; height: auto; display: block; filter: brightness(0.8); transition: all 0.4s ease; }
.video-thumb::after { content: ""; position: absolute; top: 0; left: -75%; width: 50%; height: 100%; background: linear-gradient(120deg, transparent, rgba(255,255,255,0.3), transparent); transform: skewX(-25deg); transition: left 0.8s ease; }
.video-card:hover .video-thumb::after { left: 125%; }
.video-card:hover .video-thumb img { filter: brightness(1); transform: scale(1.03); }
.play-btn { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-size: 3rem; color: #fff; background: rgba(0,0,0,0.3); transition: all 0.3s ease; }
.video-card:hover .play-btn { background: rgba(0,195,255,0.25); color: #00c3ff; }
.video-card p { margin-top: 15px; font-size: 1rem; color: #e0e0e0; }
.video-modal { position: fixed; inset: 0; display: none; align-items: center; justify-content: center; background: rgba(0, 0, 0, 0.85); z-index: 2000; }
.video-modal.active { display: flex; }
.video-box { position: relative; width: 90%; max-width: 800px; aspect-ratio: 16 / 9; background: #000; border-radius: 12px; overflow: hidden; box-shadow: 0 0 20px rgba(0, 0, 0, 0.5); }
.video-box iframe { width: 100%; height: 100%; display: block; border: none; }
.video-box .close-btn { position: absolute; top: 10px; right: 10px; width: 38px; height: 38px; background: rgba(255, 255, 255, 0.15); color: #fff; font-size: 1.8rem; border-radius: 50%; border: none; cursor: pointer; z-index: 2100; display: flex; align-items: center; justify-content: center; transition: all 0.25s ease; }
.video-box .close-btn:hover { background: rgba(255, 255, 255, 0.3); transform: scale(1.1); }
.video-modal .close-btn:hover { transform: scale(1.2); }
.play-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.4); display: flex; align-items: center; justify-content: center; transition: background 0.3s ease; }
.play-icon { font-size: 3rem; color: #fff; text-shadow: 0 0 10px rgba(0,0,0,0.6); transition: transform 0.3s ease; }
.video-thumb:hover .play-icon { transform: scale(1.2); }
.close-btn { position: absolute; top: 10px; right: 10px; width: 36px; height: 36px; border: none; background: rgba(255, 255, 255, 0.15); color: #fff; font-size: 1.8rem; font-weight: bold; border-radius: 50%; cursor: pointer; z-index: 2100; display: flex; align-items: center; justify-content: center; transition: all 0.25s ease; }
.close-btn:hover { background: rgba(255, 255, 255, 0.3); transform: scale(1.1); }

/* ====== CONTACT SECTION ====== */
.contact-section { padding: 80px 20px; }
.contact-grid { display: flex; flex-wrap: wrap; gap: 40px; align-items: flex-start; }
.contact-left, .contact-right { flex: 1; min-width: 280px; }
.contact-left { display: flex; flex-direction: column; }
.contact-right { display: flex; flex-direction: column; justify-content: center; gap: 20px; }
.contact-item { display: flex; align-items: center; margin-bottom: 18px; font-size: 1.1rem; gap: 10px; }
.contact-item .icon { display: inline-flex; align-items: center; justify-content: center; margin-right: 12px; }
.contact-item:hover .icon svg { transform: scale(1.2); }
.contact-link { color: #007BFF; font-weight: 600; text-decoration: none; transition: color 0.3s ease; display: flex; align-items: center; gap: 10px; font-weight: 500; transition: color 0.3s ease, transform 0.3s ease; }
.contact-link:hover { color: #00c3ff; transform: translateX(3px); }
.contact-link .icon svg { transition: transform 0.3s ease; }
.contact-link:hover .icon svg { transform: scale(1.1); }
.btn.small-btn { display: inline-block; margin: 25px 0; padding: 10px 24px; font-size: 1rem; font-weight: 600; border-radius: 10px; background: linear-gradient(135deg, #007BFF, #0056b3); color: #fff; text-decoration: none; transition: all 0.3s ease; box-shadow: 0 4px 14px rgba(0,123,255,0.3); }
.btn.small-btn:hover { background: linear-gradient(135deg, #0056b3, #003f88); transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,123,255,0.45); }
.btn.small-btn:active { transform: scale(0.97); }
.how-to { margin-top: 25px; padding: 20px; border: 1px solid rgba(0,123,255,0.3); border-radius: 14px; background: #f9fbff; box-shadow: inset 0 0 15px rgba(0,123,255,0.05); box-shadow: 0 4px 12px rgba(0, 123, 255, 0.08); border: 2px solid #007BFF; }
.how-to h3 { margin-bottom: 10px; font-size: 1.2rem; color: #007BFF; }
.how-to p { margin: 0; font-size: 0.95rem; line-height: 1.6; }
.contact-map-wrapper { margin-top: 40px; border-radius: 16px; overflow: hidden; box-shadow: 0 8px 18px rgba(0, 0, 0, 0.15); transition: transform 0.3s ease, box-shadow 0.3s ease; }
.contact-map-wrapper:hover { transform: scale(1.01); box-shadow: 0 10px 22px rgba(0, 0, 0, 0.25); }
.contact-map-wrapper iframe { width: 100%; height: 380px; border: none; }
.contact-btn { margin-top: 25px; align-self: start; background: linear-gradient(135deg, #007BFF, #339DFF); color: white; padding: 10px 26px; border-radius: 50px; transition: all 0.3s ease; text-decoration: none; font-weight: 500; letter-spacing: 0.3px; font-size: 1.05rem; font-weight: 700; box-shadow: 0 6px 20px rgba(0,195,255,0.35); position: relative; overflow: hidden; }
.contact-btn:hover { background: linear-gradient(135deg, #339DFF, #007BFF); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3); box-shadow: 0 10px 30px rgba(0,195,255,0.45); }
.contact-btn::after { content: ''; position: absolute; inset: 0; background: rgba(255,255,255,0.1); transform: scaleX(0); transform-origin: left; transition: transform 0.4s ease; }
.contact-btn:hover::after { transform: scaleX(1); }
.btn.review-btn { display: inline-block; padding: 12px 28px; font-size: 1rem; font-weight: 600; color: #fff; background: linear-gradient(135deg, #007BFF, #0056b3); border: none; border-radius: 50px; cursor: pointer; transition: all 0.35s ease; box-shadow: 0 6px 20px rgba(0,123,255,0.3); text-decoration: none; }
.btn.review-btn:hover { background: linear-gradient(135deg, #0056b3, #004099); box-shadow: 0 10px 25px rgba(0,123,255,0.5); transform: translateY(-3px); }

/* ====== FOOTER ====== */
.site-footer { background: linear-gradient(135deg, #0b0f18, #101a27); color: #d8e0ef; padding: 70px 20px 30px; border-top: 3px solid rgba(0,123,255,0.15); text-align: center; font-size: 0.9rem; }
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-columns { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 50px; margin-bottom: 50px; }
.footer-col h4 { display: inline-block; background: rgba(0, 123, 255, 0.15); color: #ffffff; font-size: 1.15rem; font-weight: 700; padding: 8px 18px; border-radius: 8px; margin-bottom: 20px; letter-spacing: 0.3px; box-shadow: inset 0 0 10px rgba(0, 195, 255, 0.15); }
.footer-col p { font-size: 0.95rem; line-height: 1.6; margin-bottom: 16px; color: #cbd3e0; }
.site-footer a { color: #00c3ff; text-decoration: none; }
.btn.small-btn { display: inline-flex; align-items: center; justify-content: center; margin: 25px 0; padding: 11px 26px; font-size: 1rem; font-weight: 600; border-radius: 10px; background: #007BFF; color: #f9f9f9; text-decoration: none; position: relative; overflow: hidden; transition: background 0.3s ease, color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease; letter-spacing: 0.3px; text-shadow: 0 0 6px rgba(255, 255, 255, 0.25); }
.btn.small-btn.line-btn::before { content: ""; position: absolute; left: -100%; top: 0; width: 100%; height: 100%; background: linear-gradient(90deg, rgba(255,255,255,0.15), rgba(255,255,255,0)); transition: all 0.6s ease; }
.btn.small-btn.line-btn:hover::before { left: 100%; }
.btn.small-btn:hover { background: #3399FF; color: #fff; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0, 123, 255, 0.35); }
.btn.small-btn:active { transform: scale(0.97); box-shadow: 0 3px 10px rgba(0, 123, 255, 0.35); }
.footer-contacts-col { display: flex; flex-direction: column; align-items: center; text-align: center; }
.footer-contacts { list-style: none; padding: 0; margin: 0 0 20px 0; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.footer-contacts .contact-item { display: flex; align-items: center; gap: 8px; }
.footer-contacts .contact-link { color: #d8e0ef; font-weight: 500; text-decoration: none; display: flex; align-items: center; gap: 8px; transition: color 0.3s ease, transform 0.3s ease; }
.footer-contacts .contact-link:hover { color: #00c3ff; transform: translateX(3px); }
.footer-contacts .icon svg { transition: transform 0.3s ease; }
.footer-contacts .contact-link:hover .icon svg { transform: scale(1.1); }
.footer-nav { text-align: center; }
.footer-nav ul { list-style: none; padding: 0; margin: 0; }
.footer-nav li { margin-bottom: 10px; }
.footer-nav a { color: #d8e0ef; text-decoration: none; font-weight: 500; transition: color 0.3s ease; }
.footer-nav a:hover { color: #00c3ff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 25px; text-align: center; font-size: 0.9rem; color: #a9b4c6; }
.footer-bottom p { margin: 4px 0; }

/* ====== АНИМАЦИИ (Fade) ====== */
.fade-up { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-up.show { opacity: 1; transform: translateY(0); }
.fade-in { opacity: 0; transform: translateY(25px); animation: fadeInUp 0.8s ease forwards; }
.fade-in.visible, .fade-in.show { opacity: 1; transform: translateY(0); }
@keyframes fadeInUp { to { opacity: 1; transform: translateY(0); } }
.fade-left { opacity: 0; transform: translateX(-40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-left.show { opacity: 1; transform: translateX(0); }
.fade-right { opacity: 0; transform: translateX(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-right.show { opacity: 1; transform: translateX(0); }

/* ====== Scroll Top Button ====== */
#scrollTopBtn { position: fixed; bottom: 30px; right: 25px; width: 46px; height: 46px; border: none; border-radius: 50%; background: linear-gradient(135deg, #00c3ff, #0077ff); color: #fff; font-size: 1.6rem; font-weight: bold; cursor: pointer; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25); opacity: 0; visibility: hidden; transform: translateY(30px); transition: opacity 0.4s ease, transform 0.4s ease, visibility 0.4s; z-index: 999; }
#scrollTopBtn:hover { transform: translateY(-4px) scale(1.08); box-shadow: 0 6px 18px rgba(0, 136, 255, 0.5); }
#scrollTopBtn.show { opacity: 1; visibility: visible; transform: translateY(0); }

/* ====== АДАПТИВЫ (MEDIA QUERIES) ====== */
@media (max-width: 1200px) {
  .close-menu-btn { display: block; position: absolute; top: 1.5rem; right: 1.5rem; font-size: 2.2rem; line-height: 1; color: #3ae0d7; transition: transform 0.3s ease, color 0.3s ease; }
  .close-menu-btn:hover { transform: rotate(90deg) scale(1.1); color: #fff; }
  body.menu-open::before { content: ""; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5); z-index: 998; }
  .nav-links { position: fixed; top: 16px; right: -100%; width: 75%; max-width: 340px; height: auto; bottom: 16px; background: #0a2540; display: flex; flex-direction: column; justify-content: flex-start; gap: 1.3rem; padding: 4rem 2rem 1.5rem 1.5rem; transition: right 0.35s ease, opacity 0.35s ease; box-shadow: -6px 0 14px rgba(0, 0, 0, 0.4); z-index: 999; overflow-y: auto; border-radius: 20px; }
  .nav-links.open { right: 16px; }
  .nav-toggle { display: block; font-size: 1.8rem; color: #fff; z-index: 1000; }
  .nav-links li { list-style: none; }
  .nav-links li a { color: #e5ecf5; font-size: 1.1rem; text-decoration: none; display: block; padding: 0.3rem 0; transition: color 0.2s ease; }
  .nav-links li a:hover { color: #3ae0d7; }
  .cta-btn { display: none; }
  .mobile-contacts { margin-top: auto; padding-top: 1.2rem; border-top: 1px solid rgba(255, 255, 255, 0.2); display: flex; flex-direction: column; align-items: flex-start !important; justify-content: flex-start; text-align: left !important; width: 100%; gap: 10px; }
  .mobile-contacts .footer-contacts { list-style: none; padding: 0; margin: 0; width: 100%; display: flex; flex-direction: column; align-items: flex-start !important; gap: 10px; }
  .mobile-contacts .contact-item { display: flex; align-items: center; justify-content: flex-start; width: 100%; gap: 8px; }
  .mobile-contacts .contact-item svg { flex-shrink: 0; width: 20px; height: 20px; fill: #00baff; }
  .mobile-contacts .contact-link { color: #d8e0ef; text-decoration: none; font-weight: 500; font-size: 1rem; white-space: nowrap; text-align: left; }
  .mobile-contacts .contact-link:hover { color: #fff; }
  .mobile-contacts *, .mobile-contacts .footer-contacts, .mobile-contacts .contact-item { text-align: left !important; justify-content: flex-start !important; align-items: center !important; }
  body.menu-open { overflow: hidden; }
}

@media (min-width: 1201px) {
  .mobile-contacts { display: none; }
}

@media (max-width: 1024px) {
  .hero { background-position: center 40%; }
  #tech::after { width: 320px; height: 320px; left: -20px; top: -30px; opacity: 0.25; }
}

@media (min-width: 1025px) {
  .tech-steps { grid-template-columns: repeat(4, 1fr); }
  .result-grid { grid-template-columns: repeat(3, 1fr); }
  .pricing-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 1024px) and (min-width: 641px) {
  .tech-steps { grid-template-columns: repeat(2, 1fr); }
  .result-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 992px) {
  .topbar { display: none; }
  .navbar { top: 0 !important; margin-top: 0 !important; border-top: none !important; }
  body { padding-top: 70px !important; background: #f9fbfd; }
  .lang-mobile { display: block; }
  .nav-call { display: flex; align-items: center; justify-content: center; margin-right: 8px; }
  html, body { background-color: #0077ff; }
  body::before { content: ""; position: fixed; top: 0; left: 0; right: 0; height: 1px; background: #0077ff; z-index: 9999; }
  .hero { height: 100dvh !important; margin-top: 0 !important; padding-top: 0 !important; }
  .section { scroll-margin-top: 60px; }
  .symptoms-grid { grid-template-columns: repeat(2, 1fr); max-width: 700px; }
  .topbar-inner { flex-direction: column; gap: 6px; text-align: center; padding: 8px; }
  .contact { flex-direction: column; gap: 4px; }
  .lang-btn { padding: 6px 10px; border-radius: 20px; font-size: 0.85rem; }
  .lang-mobile .lang-btn span { display: inline; font-size: 0.85rem; font-weight: 600; color: #fff; line-height: 1; }
  .footer-columns { grid-template-columns: 1fr; text-align: center; }
  .footer-nav { text-align: center; margin-top: 30px; }
  .footer-contacts-col { margin: 20px 0; }
  .btn.small-btn { margin: 15px auto; }
}

@media (min-width: 993px) {
  .lang-mobile { display: none; }
}

@media (max-width: 900px) {
  .types-layout { flex-direction: column; align-items: center; text-align: left; }
  .types-column:first-child { order: 1; }
  .types-center { order: 2; width: 100%; max-width: 360px; height: 260px; margin: 25px auto; background-size: contain; display: flex; justify-content: center; align-items: center; height: auto; min-height: 180px; background-size: contain, 50%; margin: 16px auto; }
  .types-column:last-child { order: 3; }
  .type-item { justify-content: flex-start; text-align: left; max-width: 340px; margin: 0 auto; }
  .video-grid { grid-template-columns: 1fr 1fr; gap: 25px; }
}

@media (max-width: 768px) {
  :root { --header-height: 90px; }
  .hero { text-align: center; align-items: center; background-position: center 30%; background-size: cover; background-image: url("img/hydrogen_bg.jpg"); background-position: center top; }
  .hero-inner { align-items: center; }
  .hero-cta { flex-direction: column; align-items: center; }
  .scroll-down { bottom: 20px; width: 26px; height: 26px; }
  .topbar-inner { flex-direction: column; gap: 8px; text-align: center; }
  .contact { justify-content: center; flex-wrap: nowrap; gap: 18px; }
  .topbar-right { justify-content: center; }
  #when { padding: 60px 16px; }
  #when h2 { font-size: 1.8rem; }
  .symptom-card { padding: 24px 18px; }
  .two-col { flex-direction: column; }
  .clean-image { width: 100%; min-height: 240px; margin-left: 0; }
  #tech::after { width: 340px; height: 340px; left: 50%; top: 30px; transform: translateX(-50%); background-position: center top; background-size: contain; opacity: 0.22; filter: blur(1px); }
  .tech-steps article::before { width: 70px; height: 70px; background-size: 34px 34px; }
  .tech-steps h3 { font-size: 1.15rem; }
  .tech-steps p { font-size: 0.95rem; }
  #safety::before { background-position: 40% center; opacity: 0.18; filter: brightness(0.55) blur(2px); }
  #safety .section-title { font-size: 2rem; }
  .safety-card { flex-direction: row; }
  #scrollTopBtn { width: 40px; height: 40px; font-size: 1.3rem; bottom: 20px; right: 20px; }
}

@media (max-width: 640px) {
  .tech-steps { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .type-item { flex-direction: row; justify-content: flex-start; align-items: center; text-align: left; }
  .type-item .icon { width: 56px; height: 56px; background-size: 60%; margin-right: 12px; }
  .types-center { max-width: 300px; height: 220px; background-size: 80%; }
}

@media (max-width: 600px) {
  .symptoms-grid { grid-template-columns: 1fr; max-width: 400px; }
  .video-grid { grid-template-columns: 1fr; gap: 20px; }
  .video-card { max-width: 400px; margin: 0 auto; }
  #video-reviews .section-title { font-size: 1.4rem; }
  .close-btn { top: 8px; right: 8px; width: 42px; height: 42px; font-size: 2rem; }
}

@media (max-width: 480px) {
  .contact { flex-direction: row; justify-content: center; gap: 14px; flex-wrap: nowrap; }
  .contact a { font-size: 0.9rem; }
  .lang-btn span { display: none; }
  .lang-btn { padding: 6px; width: 36px; height: 36px; border-radius: 50%; }
  .lang-flag { width: 20px; }
  #tech::after { width: 280px; height: 280px; top: 10px; opacity: 0.2; background-size: 90%; }
  .tech-steps article::before { width: 60px; height: 60px; background-size: 28px 28px; margin-bottom: 14px; }
  .types-center { min-height: 140px; max-width: 320px; background-size: contain, 60%; }
}