/* Reset / normalize */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background: #fff;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, p { margin: 0 0 1rem; }
h1:last-child, h2:last-child, h3:last-child, p:last-child { margin-bottom: 0; }

/* Blur mask for contacts, names, photos */
.blur-mask {
  filter: blur(4px);
  user-select: none;
  pointer-events: none;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-title {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  margin-bottom: 1rem;
}
.section-title strong { font-weight: 700; color: #1a1a1a; }
.section-intro { margin-bottom: 2rem; color: #555; }

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  border-bottom: 1px solid #eee;
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
}
.logo {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  color: #1a1a1a;
}
.nav { display: flex; gap: 24px; }
.nav__link {
  font-size: 0.95rem;
  color: #444;
  transition: color 0.2s;
}
.nav__link:hover { color: #c41e3a; }
.header__contacts {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.9rem;
  color: #555;
}
.header__contacts a { margin: 0; }
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
}
.burger span {
  display: block;
  height: 2px;
  background: #333;
  border-radius: 1px;
}

/* Hero */
.hero {
  padding: 80px 0 100px;
  background: linear-gradient(180deg, #f8f9fa 0%, #fff 100%);
}
.hero__inner { text-align: center; }
.hero__title {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: #1a1a1a;
}
.hero__subtitle {
  max-width: 640px;
  margin: 0 auto 2rem;
  font-size: 1.1rem;
  color: #555;
}
.hero__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.btn_primary {
  background: #c41e3a;
  color: #fff;
}
.btn_primary:hover { background: #a01830; }
.btn_secondary {
  background: transparent;
  color: #c41e3a;
  border: 2px solid #c41e3a;
}
.btn_secondary:hover { background: #c41e3a; color: #fff; }

/* About */
.about { padding: 60px 0; }
.about__text { max-width: 720px; }
.about__text p { margin-bottom: 1rem; }
.about__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 24px 48px;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}
.about__stats li { font-size: 1rem; color: #555; }

/* Certificates */
.certificates { padding: 60px 0; background: #f0f1f3; }
.certificates__intro { margin-bottom: 1.5rem; color: #555; max-width: 560px; }
.certificates__list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.certificates__item {
  padding: 16px 24px;
  background: #fff;
  border-radius: 8px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  color: #1a1a1a;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

/* Services */
.services { padding: 60px 0; background: #f8f9fa; }
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}
.service-card {
  background: #fff;
  padding: 32px;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.service-card__title {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: #1a1a1a;
}
.service-card__lead { color: #555; margin-bottom: 1rem; font-size: 0.95rem; }
.service-card__list {
  margin: 1rem 0;
  padding-left: 1.25rem;
  list-style: disc;
}
.service-card__list li { margin-bottom: 0.5rem; }
.service-card__price {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid #eee;
  font-size: 0.95rem;
}
.service-card__note { margin-top: 0.5rem; font-size: 0.875rem; color: #666; }

/* Contract cost block */
.contract-cost { padding: 48px 0; }
.contract-cost__box {
  background: linear-gradient(135deg, #c41e3a 0%, #8b1528 100%);
  color: #fff;
  padding: 40px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 8px 24px rgba(196, 30, 58, 0.25);
}
.contract-cost__link {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: opacity 0.2s, box-shadow 0.2s;
}
.contract-cost__link:hover {
  opacity: 0.95;
  box-shadow: 0 10px 28px rgba(196, 30, 58, 0.35);
}
.contract-cost__text {
  font-family: 'Montserrat', sans-serif;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 600;
  margin: 0;
}

/* Clients */
.clients { padding: 60px 0; background: #f8f9fa; }
.clients__intro { max-width: 720px; margin-bottom: 2rem; color: #555; }
.clients__list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.clients__list li {
  padding: 12px 16px;
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
  font-size: 0.95rem;
}

/* Why us */
.why { padding: 60px 0; }
.why__list { max-width: 720px; }
.why__item {
  display: flex;
  gap: 16px;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid #eee;
}
.why__item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.why__num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #c41e3a;
  color: #fff;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 50%;
}

/* Stages */
.stages { padding: 60px 0; background: #f8f9fa; }
.stages__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  counter-reset: stage;
}
.stages__item {
  position: relative;
  padding: 20px;
  padding-left: 52px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  counter-increment: stage;
}
.stages__item::before {
  content: counter(stage, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  color: #c41e3a;
}

/* Form */
.form-section { padding: 60px 0; }
.form-section__intro { margin-bottom: 1.5rem; color: #555; }
.form {
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.form__label { display: block; }
.form__radio-group { display: flex; gap: 16px; margin-top: 0.5rem; }
.form__input, .form__textarea {
  width: 100%;
  padding: 12px 16px;
  font: inherit;
  font-size: 1rem;
  border: 1px solid #ddd;
  border-radius: 6px;
  margin-top: 0.25rem;
}
.form__textarea { resize: vertical; min-height: 100px; }
.form__input:focus, .form__textarea:focus {
  outline: none;
  border-color: #c41e3a;
  box-shadow: 0 0 0 2px rgba(196, 30, 58, 0.15);
}
.form__privacy { font-size: 0.8rem; color: #666; margin: 0.5rem 0 0; }

/* Footer */
.footer {
  padding: 48px 0 24px;
  background: #1a1a1a;
  color: #bbb;
  font-size: 0.9rem;
}
.footer__inner { text-align: center; }
.footer__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-bottom: 1.5rem;
}
.footer .logo { color: #fff; }
.footer__contacts {
  display: flex;
  align-items: center;
  gap: 8px 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer__contacts a { margin: 0; }
.footer__nav {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 1rem;
}
.footer__nav a { color: #bbb; }
.footer__nav a:hover { color: #fff; }
.footer__copy { margin: 0; color: #888; }
.footer__privacy { display: inline-block; margin-top: 0.5rem; color: #888; }
.footer__privacy:hover { color: #bbb; }

/* Responsive */
@media (max-width: 1024px) {
  .header__contacts { display: none; }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: #fff;
    flex-direction: column;
    padding: 80px 24px 24px;
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    transform: translateX(100%);
    transition: transform 0.3s;
    z-index: 99;
  }
  .nav.is-open { transform: translateX(0); }
  .burger { display: flex; }
  .hero { padding: 60px 0 80px; }
  .hero__actions { flex-direction: column; }
  .about__stats { flex-direction: column; gap: 12px; }
  .services__grid { grid-template-columns: 1fr; }
  .contract-cost__box { padding: 28px 20px; }
  .stages__list { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .header__inner { min-height: 56px; padding: 0 16px; }
  .container { padding: 0 16px; }
}