:root {
  --color-bg: #f8f8fa;
  --color-surface: #ffffff;
  --color-primary: #e30613;
  --color-dark: #1c1c1e;
  --color-muted: #6c7080;
  --color-border: #e3e5ec;
  --radius-lg: 32px;
  --radius-md: 20px;
  --radius-sm: 12px;
  --shadow-soft: 0 20px 50px rgba(0, 0, 0, 0.08);
  --container-width: 1200px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--color-dark);
  background: var(--color-bg);
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--color-primary);
}

img {
  max-width: 100%;
  display: block;
  border-radius: var(--radius-md);
}

.page {
  min-height: 100vh;
  padding-top: 84px;
}

section {
  padding: 64px 20px;
}

.section {
  max-width: var(--container-width);
  margin: 0 auto;
}

.section__heading {
  margin-bottom: 32px;
}

.section__heading h2 {
  margin: 8px 0 12px;
  font-size: 1.8rem;
}

.section__heading p {
  margin: 4px 0;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--color-primary);
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(227, 229, 236, 0.8);
  z-index: 1000;
}

.header__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.header__logo {
  font-weight: 700;
  color: var(--color-primary);
}

.header__nav {
  display: none;
  align-items: center;
  gap: 16px;
}

.header__nav a {
  font-weight: 500;
  font-size: 0.95rem;
}

.header__contacts {
  margin-left: auto;
  display: none;
  flex-direction: column;
  font-size: 0.9rem;
}

.header__burger {
  margin-left: auto;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
}

.header__burger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-dark);
  margin: 0 auto;
}

.header__nav--open {
  position: absolute;
  top: 70px;
  left: 0;
  right: 0;
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  padding: 16px;
  border-bottom: 1px solid var(--color-border);
}

.btn {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 14px 24px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 25px rgba(227, 6, 19, 0.3);
}

.btn--secondary {
  background: rgba(227, 6, 19, 0.08);
  color: var(--color-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 32px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(227, 6, 19, 0.15), transparent 60%), linear-gradient(135deg, #ffffff 0%, #f3f3f7 100%);
  z-index: 0;
}

.hero__content,
.hero__form {
  position: relative;
  z-index: 1;
}

.hero__content h1 {
  font-size: 2rem;
  margin: 12px 0;
}

.hero__lead {
  color: var(--color-muted);
}

.hero__benefits {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.hero__benefits li {
  display: flex;
  gap: 12px;
  align-items: center;
}

.hero__visual {
  margin-top: 24px;
}

.hero__visual img {
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 0 auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.icon-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(227, 6, 19, 0.08);
  display: grid;
  place-items: center;
}

.icon-circle svg {
  width: 18px;
  height: 18px;
  stroke: var(--color-primary);
  fill: none;
  stroke-width: 2;
}

.form {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
  gap: 6px;
}

.form input,
.form select,
.calculator__form input,
.calculator__form select {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 1rem;
}

.form input:focus,
.calculator__form input:focus,
.calculator__form select:focus {
  outline: 2px solid rgba(227, 6, 19, 0.3);
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
}

.checkbox input {
  width: 18px;
  height: 18px;
}

.calculator__form {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.calculator__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.calculator__options {
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.calculator__summary {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: #fff7f8;
  border-radius: var(--radius-md);
  padding: 16px;
}

.calculator__cta {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.calculator__price {
  font-size: 2rem;
  font-weight: 700;
  margin: 8px 0;
}

.cards {
  display: grid;
  gap: 16px;
}

.cards--grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.cards--compact {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

.card h3 {
  margin-top: 0;
}

.about__grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about__logos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 12px;
}

.about__logos span {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
  font-weight: 600;
}

.lighting__note {
  margin-top: 24px;
  background: var(--color-surface);
  padding: 24px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.silent__grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.icon-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.icon-list__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: rgba(227, 6, 19, 0.12);
  color: var(--color-primary);
  font-weight: 700;
  margin-right: 12px;
}

.dealers__grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.dealers__info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dealers__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  box-shadow: var(--shadow-soft);
}

.gallery__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.gallery__filter {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 8px 16px;
  background: transparent;
  cursor: pointer;
}

.gallery__filter.is-active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.slider {
  position: relative;
  overflow: hidden;
}

.slider__track {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding-bottom: 8px;
}

.slider__track::-webkit-scrollbar {
  display: none;
}

.slide {
  min-width: 100%;
  scroll-snap-align: start;
}

.slide img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.slide.is-hidden {
  display: none;
}

.slide__content {
  margin-top: 12px;
}

.slider__control {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
}

.slider__control[data-prev] {
  left: 8px;
}

.slider__control[data-next] {
  right: 8px;
}

.review {
  background: var(--color-surface);
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.review__tag {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(227, 6, 19, 0.08);
  font-size: 0.85rem;
}

.review--chat {
  padding: 0;
  background: transparent;
  box-shadow: none;
}

.review__media {
  margin-bottom: 12px;
}

.review__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.review__chat {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chat {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  max-width: 90%;
}

.chat--client {
  background: #fff;
  align-self: flex-start;
  box-shadow: var(--shadow-soft);
}

.chat--manager {
  background: var(--color-primary);
  color: #fff;
  align-self: flex-end;
}

.process__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.process__steps li {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-soft);
}

.process__steps span {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(227, 6, 19, 0.12);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 8px;
}

.accordion__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  margin-bottom: 12px;
}

.accordion__trigger {
  width: 100%;
  padding: 16px;
  background: transparent;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
}

.accordion__content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  font-size: 0.95rem;
  color: var(--color-muted);
  padding: 0 16px;
}

.accordion__item.is-open .accordion__content {
  padding-top: 8px;
  padding-bottom: 16px;
}

.accordion__icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  position: relative;
}

.accordion__icon::before,
.accordion__icon::after {
  content: '';
  position: absolute;
  background: var(--color-dark);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.accordion__icon::before {
  width: 10px;
  height: 2px;
}

.accordion__icon::after {
  width: 2px;
  height: 10px;
}

.accordion__item.is-open .accordion__icon::after {
  opacity: 0;
}

.contacts__grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contacts__list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contacts__map iframe {
  width: 100%;
  height: 260px;
  border: none;
  border-radius: var(--radius-md);
}

.map__note {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer {
  background: #0f0f10;
  color: #fff;
  padding: 32px 20px;
}

.footer__grid {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer__nav,
.footer__contacts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.mobile-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.1);
}

.mobile-cta .btn {
  flex: 1;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.is-open {
  display: flex;
}

.modal__content {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 32px;
  min-width: 280px;
  position: relative;
}

.modal__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: transparent;
  cursor: pointer;
}

input.error,
select.error {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(227, 6, 19, 0.15);
}

.error-text {
  font-size: 0.8rem;
  color: var(--color-primary);
}

.section--hidden {
  opacity: 0;
  transform: translateY(40px);
}

.section--visible {
  opacity: 1;
  transform: translateY(0);
  transition: all 0.8s ease;
}

@media (min-width: 768px) {
  .page {
    padding-top: 96px;
  }

  .header__nav {
    display: flex;
  }

  .header__contacts {
    display: flex;
    align-items: flex-end;
  }

  .header__burger {
    display: none;
  }

  .hero {
    flex-direction: row;
    align-items: stretch;
  }

  .hero__content,
  .hero__form {
    flex: 1;
  }

  .hero__form {
    max-width: 360px;
  }

  .calculator__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .calculator__summary {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .about__grid {
    flex-direction: row;
  }

  .silent__grid {
    flex-direction: row;
    align-items: center;
  }

  .silent__media,
  .silent__content {
    flex: 1;
  }

  .dealers__grid {
    flex-direction: row;
  }

  .dealers__grid > * {
    flex: 1;
  }

  .process__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .contacts__grid {
    flex-direction: row;
  }

  .contacts__grid > * {
    flex: 1;
  }

  .slide {
    min-width: 50%;
  }

  .mobile-cta {
    display: none;
  }
}

@media (min-width: 1024px) {
  .hero__content h1 {
    font-size: 2.8rem;
  }

  .calculator__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .process__steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .slide {
    min-width: 33.33%;
  }
}