:root {
  --color-concrete: #E5E5E3;
  --color-steel: #F7F7F7;
  --color-carbon: #1A1A1A;
  --color-oxide: #C65A2E;
  --color-blueprint: #3B5C8A;
  --color-olive: #6A7466;
  --color-warning: #F2C94C;
  --font-primary: 'IBM Plex Sans', sans-serif;
  --font-secondary: 'Space Mono', monospace;
  --font-accent: 'Playfair Display', serif;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 4rem;
  --radius-none: 0;
  --transition-mechanical: 0.4s linear;
  --transition-snap: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sharp: 0 2px 4px rgba(26, 26, 26, 0.1);
  --shadow-soft: 0 4px 12px rgba(26, 26, 26, 0.15);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-steel);
  color: var(--color-carbon);
  line-height: 1.6;
  overflow-x: hidden;
  width: 100%;
  max-width: 100%;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-mechanical);
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xxl) 0;
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.header-wrapper {
  background-color: var(--color-carbon);
  color: var(--color-steel);
  padding: var(--space-md) 0;
  position: relative;
  width: 100%;
  z-index: 100;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  width: 100%;
  box-sizing: border-box;
}

.brand-text {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-steel);
  word-break: keep-all;
  overflow-wrap: normal;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  padding: var(--space-sm) 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-oxide);
  transition: width var(--transition-mechanical);
}

.nav-link:hover::after {
  width: 100%;
}

.burger-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-steel);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-sm);
  margin-left: auto;
  position: relative;
  z-index: 101;
}

.main-content {
  min-height: calc(100vh - 200px);
}

.hero-section {
  background-color: var(--color-carbon);
  color: var(--color-steel);
  padding: var(--space-xxl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(26, 26, 26, 0.7);
  z-index: 1;
}

.hero-section .container {
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 300;
  max-width: 800px;
  margin: 0 auto;
  opacity: 0.9;
}

.banner-image {
  width: 100%;
  height: auto;
  object-fit: cover;
  margin: var(--space-lg) 0;
}

.content-section {
  padding: var(--space-xxl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-xl);
  color: var(--color-carbon);
  position: relative;
  padding-bottom: var(--space-md);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--color-oxide);
}

.card {
  background-color: var(--color-steel);
  border: 2px solid var(--color-concrete);
  padding: var(--space-lg);
  transition: transform var(--transition-snap), box-shadow var(--transition-snap);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
  border-color: var(--color-oxide);
}

.card-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  margin-bottom: var(--space-md);
  border: 1px solid var(--color-concrete);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  color: var(--color-carbon);
}

.card-text {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-carbon);
  opacity: 0.8;
  margin-bottom: var(--space-md);
}

.price-tag {
  font-family: var(--font-secondary);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-oxide);
  margin-top: var(--space-md);
}

.btn {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  background-color: var(--color-carbon);
  color: var(--color-steel);
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  border: 2px solid var(--color-carbon);
  cursor: pointer;
  transition: all var(--transition-mechanical);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background-color: var(--color-oxide);
  transition: left var(--transition-mechanical);
  z-index: -1;
}

.btn:hover {
  color: var(--color-steel);
  border-color: var(--color-oxide);
}

.btn:hover::before {
  left: 0;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-carbon);
  border-color: var(--color-carbon);
}

.btn-secondary:hover {
  background-color: var(--color-carbon);
  color: var(--color-steel);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  color: var(--color-carbon);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-md);
  border: 2px solid var(--color-concrete);
  background-color: var(--color-steel);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: border-color var(--transition-mechanical);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-oxide);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.checkbox-input {
  margin-top: 4px;
  flex-shrink: 0;
}

.checkbox-label {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-carbon);
}

.error-message {
  color: var(--color-oxide);
  font-size: 0.875rem;
  margin-top: var(--space-xs);
  display: none;
}

.error-message.show {
  display: block;
}

.footer-wrapper {
  background-color: var(--color-carbon);
  color: var(--color-steel);
  padding: var(--space-xl) 0 var(--space-md);
  margin-top: var(--space-xxl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.footer-menu {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  list-style: none;
  margin-bottom: var(--space-lg);
  justify-content: center;
}

.footer-link {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-steel);
  opacity: 0.8;
  transition: opacity var(--transition-mechanical);
}

.footer-link:hover {
  opacity: 1;
  color: var(--color-oxide);
}

.footer-copyright {
  text-align: center;
  font-size: 0.8125rem;
  opacity: 0.6;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(247, 247, 247, 0.1);
}

.map-container {
  width: 100%;
  height: 400px;
  margin: var(--space-lg) 0;
  border: 2px solid var(--color-concrete);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.contact-info {
  margin: var(--space-lg) 0;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  font-size: 1rem;
}

.contact-item small {
  display: block;
  font-size: 0.8125rem;
  opacity: 0.7;
  margin-top: var(--space-xs);
  font-style: italic;
}

.contact-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.technical-diagram {
  background-color: var(--color-steel);
  border: 2px solid var(--color-concrete);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.blueprint-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-family: var(--font-secondary);
}

.blueprint-table th,
.blueprint-table td {
  padding: var(--space-md);
  border: 1px solid var(--color-concrete);
  text-align: left;
}

.blueprint-table th {
  background-color: var(--color-carbon);
  color: var(--color-steel);
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

.blueprint-table tr:hover {
  background-color: var(--color-concrete);
}

.measurement-line {
  position: relative;
  padding: var(--space-md);
  border-left: 3px solid var(--color-blueprint);
  background-color: var(--color-steel);
  margin: var(--space-md) 0;
  font-family: var(--font-secondary);
  font-size: 0.9375rem;
}

.full-width-image {
  width: 100%;
  height: auto;
  object-fit: cover;
  margin: var(--space-lg) 0;
  border: 2px solid var(--color-concrete);
}

.image-caption {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-carbon);
  opacity: 0.7;
  margin-top: var(--space-sm);
  font-style: italic;
}

.privacy-popup {
  position: fixed;
  bottom: var(--space-md);
  right: var(--space-md);
  background-color: var(--color-carbon);
  color: var(--color-steel);
  padding: var(--space-lg);
  max-width: 400px;
  border: 2px solid var(--color-oxide);
  z-index: 1000;
  display: none;
}

.privacy-popup.show {
  display: block;
}

.privacy-popup-content {
  margin-bottom: var(--space-md);
}

.privacy-popup-title {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}

.privacy-popup-text {
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.privacy-popup-buttons {
  display: flex;
  gap: var(--space-md);
}

.btn-accept {
  background-color: var(--color-oxide);
  color: var(--color-steel);
  border-color: var(--color-oxide);
}

.btn-accept:hover::before {
  background-color: var(--color-steel);
}

.btn-accept:hover {
  color: var(--color-carbon);
}

.page-title {
  text-align: center;
  padding: var(--space-xl) 0;
  background-color: var(--color-carbon);
  color: var(--color-steel);
  margin-bottom: var(--space-xxl);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
}

.page-title::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(26, 26, 26, 0.7);
  z-index: 1;
}

.page-title .container {
  position: relative;
  z-index: 2;
}

.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.content-block {
  margin-bottom: var(--space-xl);
}

.content-block h2 {
  color: var(--color-oxide);
  margin-bottom: var(--space-md);
}

.content-block p {
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.content-block ul,
.content-block ol {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.content-block li {
  margin-bottom: var(--space-sm);
  line-height: 1.8;
}

.thank-you-message {
  text-align: center;
  padding: var(--space-xxl) 0;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.thank-you-title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--space-lg);
  color: var(--color-oxide);
}

.thank-you-text {
  font-size: clamp(1rem, 2vw, 1.25rem);
  max-width: 600px;
  margin-bottom: var(--space-xl);
}

.error-page {
  text-align: center;
  padding: var(--space-xxl) 0;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.error-code {
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 700;
  color: var(--color-oxide);
  margin-bottom: var(--space-md);
}

.error-message-page {
  font-size: clamp(1.25rem, 3vw, 2rem);
  margin-bottom: var(--space-lg);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin: var(--space-xl) 0;
}

.stress-test-container {
  position: relative;
  padding: var(--space-xl);
  background-color: var(--color-steel);
  border: 2px solid var(--color-concrete);
  margin: var(--space-lg) 0;
}

.stress-indicator {
  width: 100%;
  height: 4px;
  background-color: var(--color-concrete);
  margin-bottom: var(--space-md);
  position: relative;
  overflow: hidden;
}

.stress-bar {
  height: 100%;
  background-color: var(--color-oxide);
  width: 0;
  transition: width var(--transition-mechanical);
}

@media (max-width: 1023px) {
  .header-wrapper {
    padding: var(--space-sm) 0;
  }

  .header-container {
    padding: 0 var(--space-sm);
  }

  .burger-toggle {
    display: block;
    margin-left: auto;
    flex-shrink: 0;
    min-width: 44px;
    min-height: 44px;
    padding: var(--space-xs);
    position: relative;
    z-index: 101;
    transition: opacity var(--transition-mechanical), visibility var(--transition-mechanical);
  }

  .burger-toggle i {
    transition: transform var(--transition-mechanical);
  }

  .burger-toggle.active i.fa-bars::before {
    content: "\f00d";
  }


  .brand-text {
    font-size: clamp(0.875rem, 4vw, 1.25rem);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: calc(100% - 50px);
    word-break: keep-all;
    overflow-wrap: normal;
  }

  .header-container {
    flex-wrap: wrap;
  }

  body.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
  }

  .header-container nav {
    width: 100%;
    order: 3;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.4s ease, padding 0.4s ease;
    padding: 0;
    position: relative;
    display: block;
  }

  .header-container nav.active {
    max-height: 500px;
    opacity: 1;
    padding: var(--space-md) 0;
  }

  .nav-menu {
    position: relative;
    width: 100%;
    background-color: var(--color-carbon);
    flex-direction: column;
    padding: var(--space-lg) var(--space-md);
    gap: 0;
    align-items: center;
    justify-content: center;
    display: flex;
    margin: 0;
    border-top: 1px solid rgba(247, 247, 247, 0.1);
  }



  .nav-link {
    width: 100%;
    max-width: 400px;
    padding: var(--space-md) var(--space-lg);
    text-align: center;
    border-bottom: 1px solid rgba(247, 247, 247, 0.1);
    transition: background-color var(--transition-mechanical), color var(--transition-mechanical), transform var(--transition-mechanical);
    display: block;
    font-size: 0.9375rem;
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  .nav-link:hover {
    background-color: rgba(247, 247, 247, 0.05);
    color: var(--color-oxide);
    transform: translateX(4px);
  }

  .nav-link::after {
    display: none;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .footer-menu {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }

  .privacy-popup {
    max-width: calc(100% - var(--space-lg));
    right: var(--space-md);
    left: var(--space-md);
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .hero-section {
    padding: var(--space-xl) 0;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .header-wrapper {
    padding: var(--space-xs) 0;
  }

  .header-container {
    padding: 0 var(--space-xs);
    min-width: 0;
  }

  .brand-text {
    font-size: 0.75rem;
    max-width: calc(100% - 50px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    word-break: keep-all;
    overflow-wrap: normal;
  }

  .burger-toggle {
    font-size: 1.25rem;
    min-width: 40px;
    min-height: 40px;
    padding: var(--space-xs);
  }


  .container {
    padding: 0 var(--space-sm);
  }

  .section {
    padding: var(--space-lg) 0;
  }

  .card {
    padding: var(--space-md);
  }

  .btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.8125rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}