/* ============================================================
   СтелсПотолок — style.css
   ============================================================ */

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

:root {
  --gold: #c9a84c;
  --gold-light: #e8c97a;
  --dark: #0f0f0f;
  --dark2: #1a1a1a;
  --dark3: #242424;
  --white: #ffffff;
  --gray: #888888;
  --light: #f5f5f5;
  --radius: 12px;
  --transition: 0.3s ease;
}

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

body {
  font-family: 'Montserrat', sans-serif;
  background: var(--dark);
  color: var(--white);
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Prevent text selection on decorative elements */
.hero-badge, .section-label, .card-tag, .promo-badge { user-select: none; }

/* === ACCESSIBILITY === */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Skip to content */
.skip-link {
  position: absolute; top: -100%; left: 16px;
  background: var(--gold); color: var(--dark);
  padding: 8px 16px; border-radius: 4px; font-weight: 700;
  z-index: 9999; text-decoration: none;
}
.skip-link:focus { top: 16px; }

/* Honeypot anti-spam field */
.hp-field { position: absolute; left: -9999px; opacity: 0; pointer-events: none; }

/* === NAVBAR === */
nav {
  position: fixed; top: 0; width: 100%; z-index: 1000;
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(201,168,76,0.2);
  padding: 0 40px;
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
  transition: background var(--transition);
}
nav.scrolled { background: rgba(10,10,10,0.98); }

.logo {
  font-size: 22px; font-weight: 800; color: var(--white);
  letter-spacing: 1px; text-decoration: none;
}
.logo span { color: var(--gold); }

.nav-links { display: flex; gap: 30px; list-style: none; }
.nav-links a {
  color: rgba(255,255,255,0.8); text-decoration: none;
  font-size: 13px; font-weight: 500; letter-spacing: 0.5px;
  transition: color var(--transition); position: relative; padding-bottom: 4px;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 0; height: 2px; background: var(--gold);
  transition: width var(--transition);
}
.nav-links a:hover { color: var(--gold); }
.nav-links a:hover::after { width: 100%; }

.nav-phone {
  color: var(--gold); font-weight: 700; font-size: 15px;
  text-decoration: none; transition: opacity var(--transition);
}
.nav-phone:hover { opacity: 0.8; }
.nav-phone i { margin-right: 6px; }

/* Burger */
.burger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.burger span {
  display: block; width: 24px; height: 2px;
  background: var(--white); border-radius: 2px;
  transition: all var(--transition);
}
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Menu */
.mobile-menu {
  position: fixed; top: 70px; left: 0; right: 0; z-index: 999;
  background: rgba(10,10,10,0.97); backdrop-filter: blur(12px);
  padding: 24px 40px; border-bottom: 1px solid rgba(201,168,76,0.2);
  transform: translateY(-10px); opacity: 0;
  transition: all var(--transition); pointer-events: none;
}
.mobile-menu:not([hidden]) { transform: translateY(0); opacity: 1; pointer-events: all; }
.mobile-menu ul { list-style: none; display: flex; flex-direction: column; gap: 16px; }
.mobile-menu a { color: rgba(255,255,255,0.85); text-decoration: none; font-size: 16px; font-weight: 500; }
.mobile-menu a.gold { color: var(--gold); font-weight: 700; }

/* === BUTTONS === */
.btn-primary {
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--dark); font-weight: 700; font-size: 14px;
  padding: 16px 36px; border: none; border-radius: 4px;
  cursor: pointer; text-transform: uppercase; letter-spacing: 1px;
  transition: all var(--transition); text-decoration: none;
  display: inline-block; font-family: 'Montserrat', sans-serif;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(201,168,76,0.4);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent; color: var(--white); font-weight: 600;
  font-size: 14px; padding: 16px 36px;
  border: 2px solid rgba(255,255,255,0.4); border-radius: 4px;
  cursor: pointer; text-transform: uppercase; letter-spacing: 1px;
  transition: all var(--transition); text-decoration: none;
  display: inline-block; font-family: 'Montserrat', sans-serif;
}
.btn-outline:hover { border-color: var(--gold); color: var(--gold); }

/* === SECTIONS === */
section { padding: 100px 60px; }

.section-label {
  font-size: 11px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--gold); margin-bottom: 12px; display: block;
}
.section-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 3.5vw, 46px);
  line-height: 1.2; margin-bottom: 16px;
}
.section-sub {
  color: var(--gray); font-size: 15px; line-height: 1.7; max-width: 560px;
}
.section-header { margin-bottom: 60px; }
.section-header.center { text-align: center; }
.section-header.center .section-sub { margin: 0 auto; }

.divider {
  width: 60px; height: 3px;
  background: linear-gradient(to right, var(--gold), var(--gold-light));
  margin: 20px 0; border-radius: 2px;
}
.divider.center { margin: 20px auto; }

/* === HERO === */
#hero {
  height: 100vh; position: relative;
  display: flex; align-items: center;
  background: url('https://images.unsplash.com/photo-1600607687939-ce8a6c25118c?w=1600&q=80') center/cover no-repeat;
  padding-top: 70px; /* offset for fixed navbar */
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.4) 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 700px; padding: 0 60px; }
.hero-badge {
  display: inline-block; background: var(--gold); color: var(--dark);
  font-size: 11px; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; padding: 6px 16px; border-radius: 20px; margin-bottom: 24px;
}
.hero-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(36px, 5vw, 64px); line-height: 1.15; margin-bottom: 20px;
}
.hero-title span { color: var(--gold); }
.hero-sub {
  font-size: 16px; color: rgba(255,255,255,0.75);
  line-height: 1.7; margin-bottom: 36px; max-width: 500px;
}
.hero-usp { display: flex; gap: 30px; margin-bottom: 40px; flex-wrap: wrap; }
.usp-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: rgba(255,255,255,0.85); }
.usp-item i { color: var(--gold); font-size: 14px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-scroll { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); z-index: 2; text-align: center; }
.hero-scroll span { display: block; font-size: 11px; letter-spacing: 2px; color: rgba(255,255,255,0.5); margin-bottom: 8px; }
.scroll-line {
  width: 1px; height: 50px;
  background: linear-gradient(to bottom, var(--gold), transparent);
  margin: 0 auto; animation: scrollAnim 2s infinite;
}
@keyframes scrollAnim {
  0%,100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.5); }
}

/* === CALCULATOR === */
#calculator { background: var(--dark2); }
.calc-wrapper {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: start; max-width: 1100px; margin: 0 auto;
}
.calc-form {
  background: var(--dark3); border: 1px solid rgba(201,168,76,0.15);
  border-radius: var(--radius); padding: 40px;
}
.form-group { margin-bottom: 24px; }
.form-group label {
  display: block; font-size: 12px; font-weight: 600;
  letter-spacing: 1px; text-transform: uppercase; color: var(--gray); margin-bottom: 10px;
}
.form-group label span { color: var(--gold); }
.form-group select {
  width: 100%; background: var(--dark2); border: 1px solid rgba(255,255,255,0.1);
  color: var(--white); padding: 12px 16px; border-radius: 6px;
  font-size: 14px; font-family: 'Montserrat', sans-serif;
  appearance: none; cursor: pointer; transition: border-color var(--transition);
}
.form-group select:focus { outline: none; border-color: var(--gold); }

input[type=range] {
  width: 100%; -webkit-appearance: none; height: 4px;
  background: rgba(255,255,255,0.1); border-radius: 2px; outline: none; cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%;
  background: var(--gold); cursor: pointer; box-shadow: 0 0 10px rgba(201,168,76,0.5);
}
input[type=range]::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--gold); cursor: pointer; border: none;
}

.calc-result {
  background: linear-gradient(135deg, var(--dark3), rgba(201,168,76,0.05));
  border: 1px solid rgba(201,168,76,0.3); border-radius: var(--radius);
  padding: 40px; text-align: center; margin-top: 24px;
}
.result-price { font-size: 56px; font-weight: 800; color: var(--gold); line-height: 1; margin: 20px 0 8px; }
.result-price span { font-size: 24px; }
.result-note { font-size: 12px; color: var(--gray); margin-bottom: 30px; }
.result-features { text-align: left; margin-bottom: 30px; list-style: none; }
.result-features li {
  display: flex; align-items: center; gap: 10px; font-size: 13px;
  padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,0.05);
}
.result-features li i { color: var(--gold); width: 16px; }

/* === CATALOG === */
#catalog { background: var(--dark); }
.catalog-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px; max-width: 1200px; margin: 0 auto;
}
.catalog-card {
  border-radius: var(--radius); overflow: hidden; position: relative;
  cursor: pointer; transition: transform 0.4s;
  border: 1px solid rgba(255,255,255,0.05);
}
.catalog-card:hover { transform: translateY(-8px); }
.catalog-card img {
  width: 100%; height: 260px; object-fit: cover;
  display: block; transition: transform 0.5s;
}
.catalog-card:hover img { transform: scale(1.05); }
.card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, transparent 60%);
}
.card-content { position: absolute; bottom: 0; left: 0; right: 0; padding: 24px; }
.card-tag { font-size: 10px; letter-spacing: 2px; text-transform: uppercase; color: var(--gold); margin-bottom: 6px; }
.card-title { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.card-price { font-size: 14px; color: rgba(255,255,255,0.7); }
.card-price strong { color: var(--gold); font-size: 18px; }

/* === ADVANTAGES === */
#advantages { background: var(--dark2); }
.adv-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px; max-width: 1200px; margin: 0 auto;
}
.adv-card {
  background: var(--dark3); border: 1px solid rgba(201,168,76,0.1);
  border-radius: var(--radius); padding: 36px 30px;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.adv-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(to right, var(--gold), var(--gold-light));
  transform: scaleX(0); transition: transform var(--transition);
}
.adv-card:hover::before { transform: scaleX(1); }
.adv-card:hover { transform: translateY(-4px); border-color: rgba(201,168,76,0.3); }
.adv-icon {
  width: 56px; height: 56px; background: rgba(201,168,76,0.1);
  border-radius: var(--radius); display: flex; align-items: center;
  justify-content: center; margin-bottom: 20px;
}
.adv-icon i { font-size: 22px; color: var(--gold); }
.adv-title { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.adv-text { font-size: 13px; color: var(--gray); line-height: 1.7; }

/* === PORTFOLIO === */
#portfolio { background: var(--dark); }
.portfolio-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 16px; max-width: 1200px; margin: 0 auto 40px;
}
.portfolio-item { border-radius: 10px; overflow: hidden; position: relative; cursor: pointer; }
.portfolio-item:first-child { grid-column: span 2; }
.portfolio-item img {
  width: 100%; height: 300px; object-fit: cover;
  display: block; transition: transform 0.5s;
}
.portfolio-item:first-child img { height: 400px; }
.portfolio-item:hover img { transform: scale(1.05); }
.portfolio-overlay {
  position: absolute; inset: 0; background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity var(--transition);
}
.portfolio-item:hover .portfolio-overlay,
.portfolio-item:focus .portfolio-overlay { opacity: 1; }
.portfolio-info { text-align: center; }
.portfolio-info i { font-size: 28px; color: var(--gold); }
.portfolio-info p { font-size: 13px; color: rgba(255,255,255,0.8); margin-top: 6px; }

/* === REVIEWS === */
#reviews { background: var(--dark2); }
.reviews-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px; max-width: 1200px; margin: 0 auto;
}
.review-card {
  background: var(--dark3); border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius); padding: 32px;
  transition: all var(--transition);
}
.review-card:hover { border-color: rgba(201,168,76,0.2); transform: translateY(-4px); }
.review-quote { font-size: 48px; color: var(--gold); opacity: 0.3; line-height: 1; margin-bottom: 16px; font-family: Georgia, serif; }
.review-text { font-size: 14px; color: rgba(255,255,255,0.8); line-height: 1.8; margin-bottom: 24px; }
.review-author { display: flex; align-items: center; gap: 14px; }
.review-avatar { width: 48px; height: 48px; border-radius: 50%; object-fit: cover; border: 2px solid var(--gold); }
.review-name { font-weight: 700; font-size: 14px; }
.review-loc { font-size: 12px; color: var(--gray); margin-top: 2px; }
.review-loc i { color: var(--gold); margin-right: 4px; }
.stars { color: var(--gold); font-size: 14px; margin-bottom: 16px; letter-spacing: 2px; }

/* === PROMO === */
#promo {
  background: url('https://images.unsplash.com/photo-1618221195710-dd6b41faaea6?w=1600&q=80') center/cover no-repeat;
  position: relative; padding: 100px 60px;
}
#promo::before { content: ''; position: absolute; inset: 0; background: rgba(0,0,0,0.82); }
.promo-inner {
  position: relative; z-index: 2; max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 30px;
}
.promo-card {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(201,168,76,0.25);
  border-radius: var(--radius); padding: 36px; text-align: center; transition: all var(--transition);
}
.promo-card:hover { background: rgba(201,168,76,0.08); transform: translateY(-4px); }
.promo-badge {
  display: inline-block; background: var(--gold); color: var(--dark);
  font-size: 28px; font-weight: 800; padding: 10px 20px;
  border-radius: 8px; margin-bottom: 16px;
}
.promo-title { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.promo-text { font-size: 13px; color: var(--gray); line-height: 1.6; margin-bottom: 20px; }
.timer { display: flex; justify-content: center; gap: 12px; margin-top: 16px; }
.timer-block { text-align: center; }
.timer-num { font-size: 28px; font-weight: 800; color: var(--gold); display: block; }
.timer-label { font-size: 10px; color: var(--gray); letter-spacing: 1px; }

/* === PROCESS === */
#process { background: var(--dark); }
.process-steps {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 0; max-width: 1100px; margin: 0 auto; position: relative;
}
.process-steps::before {
  content: ''; position: absolute; top: 36px; left: 10%; right: 10%; height: 1px;
  background: linear-gradient(to right, transparent, var(--gold), transparent);
}
.step { text-align: center; padding: 0 20px; }
.step-num {
  width: 72px; height: 72px; border-radius: 50%; background: var(--dark3);
  border: 2px solid var(--gold); display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 800; color: var(--gold);
  margin: 0 auto 24px; position: relative; z-index: 2;
}
.step-title { font-size: 15px; font-weight: 700; margin-bottom: 10px; }
.step-text { font-size: 13px; color: var(--gray); line-height: 1.6; }

/* === CERTS === */
#certs { background: var(--dark2); }
.certs-inner {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: center; max-width: 1100px; margin: 0 auto;
}
.cert-list { list-style: none; }
.cert-list li {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 20px 0; border-bottom: 1px solid rgba(255,255,255,0.06);
}
.cert-list li:last-child { border-bottom: none; }
.cert-icon {
  width: 44px; height: 44px; background: rgba(201,168,76,0.1);
  border-radius: 8px; display: flex; align-items: center;
  justify-content: center; flex-shrink: 0;
}
.cert-icon i { color: var(--gold); font-size: 18px; }
.cert-title { font-weight: 700; font-size: 14px; margin-bottom: 4px; }
.cert-desc { font-size: 13px; color: var(--gray); line-height: 1.5; }
.cert-img-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.cert-img-grid img { width: 100%; border-radius: 10px; border: 1px solid rgba(201,168,76,0.2); object-fit: cover; height: 180px; }

/* === CONTACT === */
#contact {
  background: url('https://images.unsplash.com/photo-1600566753086-00f18fb6b3ea?w=1600&q=80') center/cover no-repeat;
  position: relative;
}
#contact::before { content: ''; position: absolute; inset: 0; background: rgba(0,0,0,0.88); }
.contact-inner {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 80px; max-width: 1100px; margin: 0 auto; align-items: center;
}
.contact-form {
  background: rgba(255,255,255,0.03); border: 1px solid rgba(201,168,76,0.2);
  border-radius: 16px; padding: 48px;
}
.contact-form h3 { font-family: 'Playfair Display', serif; font-size: 28px; margin-bottom: 8px; }
.contact-form > p { color: var(--gray); font-size: 14px; margin-bottom: 32px; }
.input-group { margin-bottom: 20px; }
.input-group input,
.input-group select {
  width: 100%; background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1); color: var(--white);
  padding: 14px 18px; border-radius: 8px; font-size: 14px;
  font-family: 'Montserrat', sans-serif; transition: border-color var(--transition); outline: none;
}
.input-group input::placeholder { color: rgba(255,255,255,0.3); }
.input-group input:focus,
.input-group select:focus { border-color: var(--gold); }
.input-group input.error { border-color: #e74c3c; }

.contact-info h3 { font-family: 'Playfair Display', serif; font-size: 32px; margin-bottom: 16px; }
.contact-info > p { color: var(--gray); font-size: 15px; line-height: 1.7; margin-bottom: 40px; }
.contact-details { list-style: none; }
.contact-details li {
  display: flex; align-items: center; gap: 16px;
  padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,0.06);
}
.contact-details li:last-child { border-bottom: none; }
.contact-details i { color: var(--gold); font-size: 18px; width: 20px; }
.contact-details a { color: var(--white); text-decoration: none; font-size: 15px; transition: color var(--transition); }
.contact-details a:hover { color: var(--gold); }
.contact-details span { font-size: 15px; }

/* === SUCCESS MESSAGE === */
.success-msg { display: none; text-align: center; padding: 20px 0; }
.success-msg i { font-size: 48px; color: var(--gold); margin-bottom: 16px; display: block; }
.success-msg h4 { font-size: 20px; margin-bottom: 8px; }
.success-msg p { color: var(--gray); }

/* === FOOTER === */
footer {
  background: #080808; border-top: 1px solid rgba(201,168,76,0.15);
  padding: 40px 60px; display: flex; align-items: center;
  justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.footer-logo { font-size: 20px; font-weight: 800; }
.footer-logo span { color: var(--gold); }
.footer-copy { font-size: 12px; color: var(--gray); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 12px; color: var(--gray); text-decoration: none; transition: color var(--transition); }
.footer-links a:hover { color: var(--gold); }

/* === MODAL === */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.85); z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity var(--transition);
}
.modal-overlay:not([aria-hidden="true"]) { opacity: 1; pointer-events: all; }
.modal {
  background: var(--dark3); border: 1px solid rgba(201,168,76,0.3);
  border-radius: 16px; padding: 48px; max-width: 480px; width: 90%;
  position: relative; transform: translateY(20px); transition: transform var(--transition);
}
.modal-overlay:not([aria-hidden="true"]) .modal { transform: translateY(0); }
.modal-close {
  position: absolute; top: 16px; right: 20px;
  background: none; border: none; color: var(--gray);
  font-size: 22px; cursor: pointer; transition: color var(--transition);
}
.modal-close:hover { color: var(--white); }
.modal h3 { font-family: 'Playfair Display', serif; font-size: 26px; margin-bottom: 8px; }
.modal > p { color: var(--gray); font-size: 14px; margin-bottom: 28px; }

/* === FLOATING BUTTON === */
.float-btn {
  position: fixed; bottom: 30px; right: 30px; z-index: 999;
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--dark); width: 60px; height: 60px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; box-shadow: 0 8px 30px rgba(201,168,76,0.5);
  cursor: pointer; text-decoration: none; animation: pulse 2s infinite;
}
@keyframes pulse {
  0%,100% { box-shadow: 0 8px 30px rgba(201,168,76,0.5); }
  50% { box-shadow: 0 8px 50px rgba(201,168,76,0.8); }
}

/* === SCROLL ANIMATIONS === */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  section { padding: 80px 40px; }
  nav { padding: 0 24px; }
}

@media (max-width: 900px) {
  section { padding: 70px 24px; }
  nav { padding: 0 20px; }
  .nav-links { display: none; }
  .burger { display: flex; }
  #hero { padding-top: 70px; align-items: flex-end; padding-bottom: 80px; }
  .hero-content { padding: 0 24px; }
  .calc-wrapper,
  .certs-inner,
  .contact-inner,
  .promo-inner { grid-template-columns: 1fr; }
  .portfolio-grid { grid-template-columns: 1fr 1fr; }
  .portfolio-item:first-child { grid-column: span 2; }
  .process-steps { grid-template-columns: 1fr 1fr; gap: 40px; }
  .process-steps::before { display: none; }
  footer { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
}

@media (max-width: 600px) {
  #hero { padding-top: 70px; align-items: flex-end; padding-bottom: 60px; }
  .hero-title { font-size: clamp(28px, 8vw, 40px); }
  .portfolio-grid { grid-template-columns: 1fr; }
  .portfolio-item:first-child { grid-column: span 1; }
  .portfolio-item:first-child img { height: 260px; }
  .process-steps { grid-template-columns: 1fr; }
  .cert-img-grid { grid-template-columns: 1fr; }
  .hero-usp { flex-direction: column; gap: 12px; }
  .hero-btns { flex-direction: column; }
  .promo-inner { grid-template-columns: 1fr; }
  .contact-form { padding: 28px 20px; }
  footer { padding: 30px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}