:root {
  --primary: #1F3A5F;
  --secondary-light: #F2F4F7;
  --secondary-slate: #6B7C93;
  --accent: #E58A3A;
  --white: #FFFFFF;
  --text-dark: #1F3A5F;
  --text-light: #6B7C93;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  --max-width: 1200px;
  --border-radius: 4px;
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
  font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: var(--spacing-sm);
}

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

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

header {
  background-color: var(--white);
  border-bottom: 1px solid var(--secondary-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-sm);
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary);
}

.logo:hover {
  color: var(--primary);
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

nav a {
  color: var(--text-dark);
  font-weight: 500;
}

nav a:hover {
  color: var(--accent);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary);
  padding: var(--spacing-xs);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--white);
  border-bottom: 1px solid var(--secondary-light);
  padding: var(--spacing-sm);
}

.mobile-menu.active {
  display: block;
}

.mobile-menu ul {
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: flex-start;
}

.hero {
  background-color: var(--secondary-light);
  padding: var(--spacing-xl) var(--spacing-sm);
  text-align: left;
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  max-width: 800px;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 600px;
  margin-bottom: var(--spacing-md);
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition);
  text-align: center;
}

.btn:hover {
  background-color: var(--accent);
  color: var(--white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  background-color: var(--primary);
  color: var(--white);
}

.section {
  padding: var(--spacing-xl) var(--spacing-sm);
}

.section-title {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

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

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

.card {
  background-color: var(--white);
  border: 1px solid var(--secondary-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  transition: box-shadow var(--transition);
}

.card:hover {
  box-shadow: 0 4px 12px rgba(31, 58, 95, 0.1);
}

.card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
}

.process-step {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  align-items: flex-start;
}

.process-number {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  background-color: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.25rem;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.portfolio-item {
  background-color: var(--secondary-light);
  border-radius: var(--border-radius);
  overflow: hidden;
  aspect-ratio: 16/9;
}

.portfolio-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

form label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--text-dark);
}

form input[type="text"],
form input[type="email"],
form textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--secondary-slate);
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: inherit;
}

form input[type="text"]:focus,
form input[type="email"]:focus,
form textarea:focus {
  outline: none;
  border-color: var(--primary);
}

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

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.checkbox-group input[type="checkbox"] {
  margin-top: 0.25rem;
  flex-shrink: 0;
}

.checkbox-group label {
  margin-bottom: 0;
  font-weight: normal;
}

footer {
  background-color: var(--primary);
  color: var(--white);
  padding: var(--spacing-lg) var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.footer-section h3 {
  color: var(--white);
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--secondary-light);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.footer-section a:hover {
  color: var(--white);
}

.footer-bottom {
  text-align: center;
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--secondary-light);
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  background-color: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: background-color var(--transition);
  z-index: 50;
}

.back-to-top.visible {
  display: flex;
}

.back-to-top:hover {
  background-color: var(--accent);
}

.content-block {
  margin-bottom: var(--spacing-lg);
}

.content-block h2 {
  margin-bottom: var(--spacing-sm);
}

.content-block p {
  color: var(--text-light);
}

.feature-section {
  display: grid;
  gap: var(--spacing-lg);
  align-items: center;
}

.feature-left {
  grid-template-columns: 1fr 1fr;
}

.feature-right {
  grid-template-columns: 1fr 1fr;
}

.feature-image img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(31, 58, 95, 0.1);
}

.feature-content h2 {
  margin-bottom: var(--spacing-md);
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.icon-card {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--white);
  border-radius: var(--border-radius);
  transition: transform var(--transition), box-shadow var(--transition);
}

.icon-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(31, 58, 95, 0.15);
}

.icon-wrapper {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.icon-card h3 {
  margin-bottom: var(--spacing-xs);
  color: var(--primary);
}

.icon-card p {
  color: var(--text-light);
  font-size: 0.9375rem;
}

.stats-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
  text-align: center;
}

.stat-item {
  padding: var(--spacing-md);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  color: var(--text-light);
  font-size: 1rem;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .mobile-menu-toggle {
    display: block;
  }

  nav {
    display: none;
  }

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

  .process-step {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .process-number {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1rem;
  }

  .hero {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .section-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
  }

  .card {
    padding: var(--spacing-sm);
  }

  .btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
  }

  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .footer-section {
    margin-bottom: var(--spacing-sm);
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.25rem;
  }

  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  form {
    max-width: 100%;
  }

  .content-block {
    margin-bottom: var(--spacing-md);
  }

  .feature-section {
    grid-template-columns: 1fr !important;
    gap: var(--spacing-md);
  }

  .feature-image {
    order: -1;
  }

  .icon-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .stats-section {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .stat-number {
    font-size: 2rem;
  }
}

@media (max-width: 320px) {
  h1 {
    font-size: 1.5rem;
    line-height: 1.3;
  }

  h2 {
    font-size: 1.375rem;
    line-height: 1.3;
  }

  h3 {
    font-size: 1.125rem;
    line-height: 1.3;
  }

  body {
    font-size: 14px;
    line-height: 1.5;
  }

  .container {
    padding: 0 var(--spacing-xs);
    max-width: 100%;
  }

  .header-content {
    padding: var(--spacing-xs);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
  }

  .logo {
    font-size: 0.9375rem;
    word-break: break-word;
  }

  .mobile-menu-toggle {
    font-size: 1.25rem;
    padding: 0.25rem;
    min-width: 2rem;
  }

  .mobile-menu {
    padding: var(--spacing-xs);
  }

  .mobile-menu ul {
    gap: var(--spacing-xs);
  }

  .mobile-menu a {
    font-size: 0.875rem;
    padding: var(--spacing-xs) 0;
  }

  .hero {
    padding: var(--spacing-md) var(--spacing-xs);
  }

  .hero-content {
    max-width: 100%;
  }

  .hero h1 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
  }

  .hero p {
    font-size: 0.9375rem;
    line-height: 1.5;
  }

  .section {
    padding: var(--spacing-md) var(--spacing-xs);
  }

  .section-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
  }

  .card {
    padding: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
  }

  .card h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
  }

  .card p {
    font-size: 0.875rem;
    line-height: 1.5;
  }

  .btn {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    width: 100%;
    display: block;
    text-align: center;
    margin-top: var(--spacing-sm);
  }

  .btn-secondary {
    width: 100%;
  }

  .grid {
    gap: var(--spacing-sm);
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .footer-section {
    margin-bottom: var(--spacing-md);
  }

  .footer-section h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
  }

  .footer-section p,
  .footer-section a {
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-xs);
  }

  .footer-bottom {
    padding-top: var(--spacing-sm);
    margin-top: var(--spacing-sm);
  }

  .footer-bottom p {
    font-size: 0.8125rem;
  }

  .back-to-top {
    bottom: 0.75rem;
    right: 0.75rem;
    width: 2rem;
    height: 2rem;
    font-size: 1rem;
  }

  .process-step {
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
  }

  .process-number {
    width: 2rem;
    height: 2rem;
    font-size: 0.875rem;
  }

  .process-step h2 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
  }

  .process-step p {
    font-size: 0.875rem;
    line-height: 1.5;
  }

  .portfolio-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .portfolio-item {
    aspect-ratio: 16/9;
  }

  form {
    max-width: 100%;
    padding: 0;
  }

  .form-group {
    margin-bottom: var(--spacing-sm);
  }

  form input[type="text"],
  form input[type="email"],
  form textarea {
    font-size: 0.875rem;
    padding: 0.625rem;
    width: 100%;
    box-sizing: border-box;
  }

  form label {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
  }

  form textarea {
    min-height: 120px;
  }

  .checkbox-group {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
  }

  .checkbox-group label {
    font-size: 0.875rem;
  }

  .content-block {
    margin-bottom: var(--spacing-md);
  }

  .content-block h2 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
  }

  .content-block p {
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-xs);
  }

  .content-block ul {
    margin-left: var(--spacing-sm);
    padding-left: var(--spacing-sm);
  }

  .content-block li {
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-xs);
  }

  .feature-section {
    grid-template-columns: 1fr !important;
    gap: var(--spacing-sm);
  }

  .feature-left .feature-image,
  .feature-right .feature-image {
    order: -1;
  }

  .feature-image {
    width: 100%;
    margin-bottom: var(--spacing-sm);
  }

  .feature-image img {
    width: 100%;
    height: auto;
    max-width: 100%;
  }

  .feature-content h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
  }

  .feature-content p {
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-xs);
  }

  .icon-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .icon-card {
    padding: var(--spacing-sm);
  }

  .icon-wrapper {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
  }

  .icon-card h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
  }

  .icon-card p {
    font-size: 0.8125rem;
    line-height: 1.5;
  }

  .stats-section {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .stat-item {
    padding: var(--spacing-sm);
  }

  .stat-number {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
  }

  .stat-label {
    font-size: 0.875rem;
    line-height: 1.4;
  }
}