:root {
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
    "Segoe UI Symbol";
  --font-secondary: "Georgia", serif;

  --color-background-light: #f8f9fa;
  --color-surface-light: #ffffff;
  --color-border-light: #dee2e6;
  --color-text-primary-light: #212529;
  --color-text-secondary-light: #495057;
  --color-text-muted-light: #6c757d;
  --color-accent-light: #007bff;
  --color-accent-hover-light: #0056b3;
  --color-accent-secondary-light: #e7f1ff;
  --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.05);

  --color-background-dark: #121212;
  --color-surface-dark: #1e1e1e;
  --color-border-dark: #333333;
  --color-text-primary-dark: #e0e0e0;
  --color-text-secondary-dark: #b0b0b0;
  --color-text-muted-dark: #888888;
  --color-accent-dark: #4dabf7;
  --color-accent-hover-dark: #228be6;
  --color-accent-secondary-dark: #1c2b3a;
  --shadow-dark: 0 4px 8px rgba(0, 0, 0, 0.2);

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2.5rem;
  --spacing-xxl: 4rem;

  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;

  --transition-speed: 0.3s;
}

[data-theme="light"] {
  --color-background: var(--color-background-light);
  --color-surface: var(--color-surface-light);
  --color-border: var(--color-border-light);
  --color-text-primary: var(--color-text-primary-light);
  --color-text-secondary: var(--color-text-secondary-light);
  --color-text-muted: var(--color-text-muted-light);
  --color-accent: var(--color-accent-light);
  --color-accent-hover: var(--color-accent-hover-light);
  --color-accent-secondary: var(--color-accent-secondary-light);
  --shadow-main: var(--shadow-light);
}

[data-theme="dark"] {
  --color-background: var(--color-background-dark);
  --color-surface: var(--color-surface-dark);
  --color-border: var(--color-border-dark);
  --color-text-primary: var(--color-text-primary-dark);
  --color-text-secondary: var(--color-text-secondary-dark);
  --color-text-muted: var(--color-text-muted-dark);
  --color-accent: var(--color-accent-dark);
  --color-accent-hover: var(--color-accent-hover-dark);
  --color-accent-secondary: var(--color-accent-secondary-dark);
  --shadow-main: var(--shadow-dark);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-background);
  color: var(--color-text-primary);
  line-height: 1.6;
  transition: background-color var(--transition-speed) ease,
    color var(--transition-speed) ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-text-primary);
  line-height: 1.2;
  font-weight: 600;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
}
h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
}
h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}
h4 {
  font-size: 1.125rem;
}
h5 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-speed) ease;
}

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

ul,
ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.button {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border-radius: var(--border-radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  text-decoration: none;
}

.button-primary {
  background-color: var(--color-accent);
  color: var(--color-surface);
  border-color: var(--color-accent);
}

.button-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-surface);
  transform: translateY(-2px);
  text-decoration: none;
}

.button-accent {
  background-color: var(--color-accent);
  color: var(--color-surface);
  border-color: var(--color-accent);
}

.button-accent:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-2px);
  text-decoration: none;
}

.button-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
}

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

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

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

.section-subtitle {
  font-size: 1.125rem;
  max-width: 700px;
  margin: 0 auto;
  color: var(--color-text-muted);
}

.animated {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animated.visible {
  opacity: 1;
  transform: translateY(0);
}

.main-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: color-mix(
    in srgb,
    var(--color-background) 80%,
    transparent
  );
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  transition: background-color var(--transition-speed) ease;
}

.main-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-primary);
}

.logo-link:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.logo-icon {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--spacing-xs) 0;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-speed) ease;
}

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

.nav-link:hover {
  color: var(--color-text-primary);
  text-decoration: none;
}

.hero-section {
  text-align: center;
  padding: 6rem 0;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-title {
  margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
  font-size: 1.25rem;
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
  color: var(--color-text-secondary);
}

.product-description-section {
  background-color: var(--color-surface);
}

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

.feature-card {
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: transform var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-main);
}

.feature-icon {
  display: inline-flex;
  padding: var(--spacing-md);
  background-color: var(--color-accent-secondary);
  border-radius: 50%;
  margin-bottom: var(--spacing-lg);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  color: var(--color-accent);
}

.feature-title {
  margin-bottom: var(--spacing-sm);
}

.benefits-section {
  background-color: var(--color-background);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.benefit-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  background-color: var(--color-surface);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
}

.benefit-icon-wrapper {
  flex-shrink: 0;
}

.benefit-icon-wrapper svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.benefit-title {
  margin-bottom: var(--spacing-xs);
  font-size: 1.1rem;
}

.how-to-pay-taxes-section {
  background-color: var(--color-surface);
}

.steps-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.steps-container::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background-color: var(--color-border);
}

.step-item {
  position: relative;
  display: flex;
  gap: var(--spacing-lg);
  padding-left: 60px;
  margin-bottom: var(--spacing-xl);
}

.step-number {
  position: absolute;
  left: 0;
  top: 0;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  border: 3px solid var(--color-background);
}

.step-title {
  margin-bottom: var(--spacing-sm);
}

.tariffs-comparison-section {
  background-color: var(--color-background);
}

.comparison-table-wrapper {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-main);
}

.comparison-table th,
.comparison-table td {
  padding: var(--spacing-lg);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  background-color: var(--color-accent-secondary);
  color: var(--color-text-primary);
  font-size: 1rem;
  font-weight: 600;
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.comparison-table tbody tr:nth-child(even) {
  background-color: var(--color-background);
}

.comparison-table .feature-cell {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
}

.comparison-table .feature-cell svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

.learning-materials-section {
  background-color: var(--color-surface);
}

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

.material-card {
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.material-icon svg {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  margin-bottom: var(--spacing-lg);
}

.material-title {
  margin-bottom: var(--spacing-sm);
}

.mission-vision-section {
  background-color: var(--color-accent-secondary);
}

.mission-vision-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xxl);
  max-width: 1000px;
  margin: 0 auto;
}

.mission-title,
.vision-title {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.mission-title::after,
.vision-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 50px;
  height: 3px;
  background-color: var(--color-accent);
}

.team-section {
  background-color: var(--color-background);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-xl);
}

.team-member-card {
  text-align: center;
}

.team-member-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto var(--spacing-md);
  border-radius: 50%;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.team-member-icon svg {
  width: 48px;
  height: 48px;
  color: var(--color-text-secondary);
}

.team-member-name {
  margin-bottom: var(--spacing-xs);
}

.team-member-role {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.testimonials-section {
  background-color: var(--color-surface);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.testimonial-card {
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.testimonial-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--color-accent-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.testimonial-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.testimonial-author-name {
  margin: 0;
  font-weight: 600;
}

.testimonial-author-role {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.testimonial-quote p {
  font-family: var(--font-secondary);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin: 0;
}

.cta-section {
  background-color: var(--color-accent);
  color: var(--color-surface);
  text-align: center;
}

.cta-section .cta-title {
  color: var(--color-surface);
}

.cta-section .cta-text {
  color: var(--color-surface);
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-xl);
}

.cta-section .button-accent {
  background-color: var(--color-surface);
  color: var(--color-accent);
  border-color: var(--color-surface);
}

.cta-section .button-accent:hover {
  background-color: var(--color-background);
  color: var(--color-text-primary);
  border-color: var(--color-background);
}

.main-footer {
  background-color: var(--color-surface);
  padding-top: var(--spacing-xxl);
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

.footer-heading {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

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

.footer-list a {
  color: var(--color-text-secondary);
}

.footer-list a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.footer-text {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

#cookie-notice-container {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 2000;
}

.cookie-notice {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  transform: translateY(100%);
  transition: transform 0.5s ease-in-out;
}

.cookie-notice.visible {
  transform: translateY(0);
}

.cookie-notice-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.cookie-notice-text a {
  text-decoration: underline;
}

.cookie-accept-button {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9rem;
  white-space: nowrap;
}

@media (max-width: 768px) {
  .main-navigation {
    position: relative;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    flex-direction: column;
    gap: 0;
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed) ease,
      transform var(--transition-speed) ease,
      visibility var(--transition-speed) ease;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
  }

  .nav-menu.is-active {
    opacity: 1;
    visibility: visible;
    transform: translateY(10px);
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: var(--spacing-sm);
  }

  .nav-actions {
    display: none;
  }

  .nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    z-index: 1001;
  }

  .nav-toggle .icon-menu,
  .nav-toggle .icon-close {
    width: 24px;
    height: 24px;
    color: var(--color-text-primary);
  }

  .nav-toggle .icon-close {
    display: none;
  }

  .nav-toggle.is-active .icon-menu {
    display: none;
  }

  .nav-toggle.is-active .icon-close {
    display: block;
  }

  .steps-container::before {
    left: 20px;
  }

  .step-item {
    padding-left: 60px;
  }

  .mission-vision-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .comparison-table th,
  .comparison-table td {
    padding: var(--spacing-md);
  }

  .comparison-table {
    display: block;
  }

  .comparison-table thead {
    display: none;
  }

  .comparison-table tbody,
  .comparison-table tr,
  .comparison-table td {
    display: block;
    width: 100%;
  }

  .comparison-table tr {
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    overflow: hidden;
  }

  .comparison-table td {
    border: none;
    border-bottom: 1px solid var(--color-border);
    text-align: right;
    position: relative;
    padding-left: 50%;
  }

  .comparison-table td::before {
    content: attr(data-label);
    position: absolute;
    left: var(--spacing-md);
    width: calc(50% - var(--spacing-xl));
    text-align: left;
    font-weight: bold;
    color: var(--color-text-primary);
  }

  .comparison-table td:last-child {
    border-bottom: none;
  }

  .footer-grid {
    text-align: center;
  }
}