:root {
  --bg-primary-light: #ffffff;
  --bg-secondary-light: #f4f7fa;
  --bg-tertiary-light: #e9eef2;
  --text-primary-light: #121826;
  --text-secondary-light: #4a5568;
  --text-tertiary-light: #718096;
  --accent-primary-light: #2c67f2;
  --accent-secondary-light: #0045cb;
  --border-color-light: #d8e0e8;
  --shadow-color-light: rgba(44, 103, 242, 0.1);
  --success-light: #28a745;
  --card-bg-light: #ffffff;

  --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-secondary: "Lora", serif;
  --base-font-size: 16px;
  --line-height-base: 1.65;
  --line-height-heading: 1.25;

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

  --transition-fast: 0.2s ease-in-out;
  --transition-medium: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);

  --max-width-small: 800px;
  --max-width-large: 1240px;

  --spacing-xs: 4px;
  --spacing-s: 8px;
  --spacing-m: 16px;
  --spacing-l: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  --spacing-xxxl: 64px;
  --section-padding: 96px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary-light: #0d1117;
    --bg-secondary-light: #161b22;
    --bg-tertiary-light: #21262d;
    --text-primary-light: #e6edf3;
    --text-secondary-light: #a0aec0;
    --text-tertiary-light: #7d8590;
    --accent-primary-light: #4c82ff;
    --accent-secondary-light: #709dff;
    --border-color-light: #30363d;
    --shadow-color-light: rgba(76, 130, 255, 0.1);
    --success-light: #3fb95a;
    --card-bg-light: #161b22;
  }
}

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

html {
  font-size: var(--base-font-size);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary-light);
  color: var(--text-primary-light);
  font-family: var(--font-primary);
  line-height: var(--line-height-base);
}

.container {
  width: 100%;
  max-width: var(--max-width-large);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-xl);
  padding-right: var(--spacing-xl);
}

section {
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
  position: relative;
  overflow: hidden;
}

section:nth-of-type(even) {
  background-color: var(--bg-secondary-light);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: var(--line-height-heading);
  color: var(--text-primary-light);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-l);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 1.8rem);
  margin-bottom: var(--spacing-m);
}

h4 {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  margin-bottom: var(--spacing-s);
}

p {
  margin-bottom: var(--spacing-m);
  color: var(--text-secondary-light);
  max-width: 72ch;
}

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

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

ul,
ol {
  padding-left: var(--spacing-l);
  margin-bottom: var(--spacing-m);
}

li {
  margin-bottom: var(--spacing-s);
  color: var(--text-secondary-light);
}

ul li::marker {
  color: var(--accent-primary-light);
}

.section-header {
  text-align: center;
  max-width: var(--max-width-small);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-xxxl);
}

.section-header p {
  font-size: 1.125rem;
  margin-left: auto;
  margin-right: auto;
}

.cta-button {
  display: inline-block;
  background-color: var(--accent-primary-light);
  color: #ffffff;
  padding: 14px 28px;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition-fast),
    transform var(--transition-fast);
}

.cta-button:hover {
  background-color: var(--accent-secondary-light);
  color: #ffffff;
  text-decoration: none;
  transform: translateY(-2px);
}

.main-header {
  padding: var(--spacing-m) 0;
  position: sticky;
  top: 0;
  background-color: color-mix(
    in srgb,
    var(--bg-primary-light) 85%,
    transparent
  );
  backdrop-filter: blur(10px);
  z-index: 999;
  border-bottom: 1px solid var(--border-color-light);
}

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

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary-light);
  text-decoration: none;
}

.logo:hover {
  color: var(--text-primary-light);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--spacing-xl);
}

.nav-menu a {
  color: var(--text-secondary-light);
  font-weight: 500;
  padding: var(--spacing-s) 0;
  position: relative;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-primary-light);
  transition: width var(--transition-medium);
}

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

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-s);
}

.mobile-menu-toggle svg {
  width: 28px;
  height: 28px;
  color: var(--text-primary-light);
}

.hero {
  padding-top: var(--spacing-xxxl);
  padding-bottom: calc(var(--section-padding) * 1.5);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--spacing-xxxl);
}

.hero-content .subtitle {
  font-size: 1.25rem;
  line-height: 1.6;
  margin: var(--spacing-xl) 0;
  color: var(--text-secondary-light);
}

.hero-cta {
  display: inline-block;
  background-color: var(--accent-primary-light);
  color: #ffffff;
  padding: 18px 36px;
  border-radius: var(--border-radius-md);
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 15px var(--shadow-color-light);
  transition: all var(--transition-fast);
}

.hero-cta:hover {
  background-color: var(--accent-secondary-light);
  color: #ffffff;
  text-decoration: none;
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px var(--shadow-color-light);
}

.hero-image-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-container img {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius-lg);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
  100% {
    transform: translateY(0px);
  }
}

.themes {
  background-color: var(--bg-secondary-light);
}

.tabs-container {
  max-width: var(--max-width-large);
  margin: auto;
}

.tab-buttons {
  display: flex;
  justify-content: center;
  border-bottom: 2px solid var(--border-color-light);
  margin-bottom: var(--spacing-xxl);
  flex-wrap: wrap;
  gap: var(--spacing-m);
}

.tab-button {
  padding: var(--spacing-m) var(--spacing-xl);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  background-color: transparent;
  border: none;
  color: var(--text-tertiary-light);
  border-bottom: 4px solid transparent;
  transform: translateY(2px);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-s);
}

.tab-button svg {
  width: 20px;
  height: 20px;
  transition: color var(--transition-fast);
}

.tab-button:hover {
  color: var(--text-primary-light);
}

.tab-button.active {
  color: var(--accent-primary-light);
  border-color: var(--accent-primary-light);
}

.tab-button.active svg {
  color: var(--accent-primary-light);
}

.tab-content {
  display: none;
  animation: fadeIn 0.5s ease-in-out;
}

.tab-content.active {
  display: block;
}

.tab-content h3 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.tab-content h4 {
  margin-top: var(--spacing-xl);
}

.tab-content ul {
  list-style-type: "✓";
  padding-left: var(--spacing-m);
}

.tab-content ul li {
  padding-left: var(--spacing-s);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.case-studies-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xxxl);
}

.case-study {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-xxl);
  align-items: center;
  background-color: var(--card-bg-light);
  border: 1px solid var(--border-color-light);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: transform var(--transition-medium),
    box-shadow var(--transition-medium);
}

.case-study:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 30px var(--shadow-color-light);
}

.case-study:nth-child(even) {
  grid-template-columns: 1.5fr 1fr;
}

.case-study:nth-child(even) .case-study-image {
  order: 2;
}

.case-study:nth-child(even) .case-study-content {
  order: 1;
}

.case-study-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-study-content {
  padding: var(--spacing-xxl);
}

.case-study-content p {
  font-size: 0.95rem;
}

.case-study-tag {
  display: inline-block;
  background-color: var(--bg-tertiary-light);
  color: var(--text-secondary-light);
  padding: var(--spacing-xs) var(--spacing-m);
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  margin-right: var(--spacing-s);
  margin-top: var(--spacing-m);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-xxxl);
}

.resource-list {
  background-color: var(--card-bg-light);
  padding: var(--spacing-xxl);
  border: 1px solid var(--border-color-light);
  border-radius: var(--border-radius-lg);
}

.resource-list h3 {
  border-bottom: 2px solid var(--accent-primary-light);
  padding-bottom: var(--spacing-m);
  display: inline-block;
}

.resource-list ul {
  list-style: none;
  padding: 0;
}

.resource-list li {
  padding: var(--spacing-l) 0;
  border-bottom: 1px solid var(--border-color-light);
}

.resource-list li:last-child {
  border-bottom: none;
}

.resource-list li strong {
  display: block;
  color: var(--text-primary-light);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-s);
}

.resource-list li p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.faq-accordion {
  max-width: var(--max-width-small);
  margin: 0 auto;
}

.faq-accordion details {
  background-color: var(--card-bg-light);
  border: 1px solid var(--border-color-light);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-m);
  transition: background-color var(--transition-fast);
}

.faq-accordion details[open] {
  background-color: var(--bg-secondary-light);
}

.faq-accordion summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-l);
  cursor: pointer;
  font-size: 1.125rem;
  font-weight: 600;
  list-style: none;
}

.faq-accordion summary::-webkit-details-marker {
  display: none;
}

.faq-accordion summary .icon-plus {
  transition: transform var(--transition-medium);
  color: var(--accent-primary-light);
  flex-shrink: 0;
}

.faq-accordion details[open] summary .icon-plus {
  transform: rotate(45deg);
}

.faq-content {
  padding: 0 var(--spacing-l) var(--spacing-l);
  overflow: hidden;
}

.faq-content p {
  margin: 0;
}

.faq-link-container {
  text-align: center;
  margin-top: var(--spacing-xxl);
}

.faq-link-container p {
  font-size: 1.1rem;
}

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

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

.testimonial-card p {
  font-family: var(--font-secondary);
  font-size: 1.1rem;
  line-height: 1.7;
  flex-grow: 1;
  margin: 0;
  color: var(--text-primary-light);
}

.testimonial-card footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-l);
  border-top: 1px solid var(--border-color-light);
}

.testimonial-card cite {
  font-style: normal;
  font-weight: 600;
  display: block;
  color: var(--text-primary-light);
}

.testimonial-card span {
  font-size: 0.9rem;
  color: var(--text-tertiary-light);
}

.newsletter-signup {
  background-color: var(--accent-primary-light);
  color: #ffffff;
}

.newsletter-signup .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-xxxl);
}

.newsletter-signup h2,
.newsletter-signup p {
  color: #ffffff;
}

.newsletter-signup h2 {
  margin-bottom: var(--spacing-m);
}

.newsletter-signup p {
  max-width: 60ch;
  opacity: 0.9;
}

.newsletter-form-container {
  flex-shrink: 0;
  width: 100%;
  max-width: 500px;
}

#newsletter-form {
  display: flex;
  gap: var(--spacing-m);
}

#newsletter-form input {
  width: 100%;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--border-radius-md);
  background-color: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  font-size: 1rem;
}

#newsletter-form input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

#newsletter-form input:focus {
  outline: none;
  border-color: #ffffff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

#newsletter-form button {
  padding: 16px 24px;
  border: none;
  border-radius: var(--border-radius-md);
  background-color: #ffffff;
  color: var(--accent-primary-light);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

#newsletter-form button:hover {
  background-color: var(--bg-tertiary-light);
}

#form-thank-you p {
  color: var(--success-light);
  background-color: color-mix(in srgb, var(--success-light) 15%, transparent);
  padding: var(--spacing-m);
  border-radius: var(--border-radius-md);
}

@media (prefers-color-scheme: light) {
  #form-thank-you p {
    background-color: #e9f7ec;
  }
}

.main-footer-bottom {
  background-color: var(--bg-secondary-light);
  padding-top: var(--section-padding);
  padding-bottom: var(--spacing-xxl);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--spacing-xxxl);
  margin-bottom: var(--spacing-xxxl);
}

.footer-column h4 {
  color: var(--text-primary-light);
  margin-bottom: var(--spacing-l);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-column.about p {
  font-size: 0.9rem;
  margin-bottom: var(--spacing-m);
}

.footer-link {
  font-weight: 500;
}

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-column li {
  margin-bottom: var(--spacing-m);
}

.footer-column li a {
  color: var(--text-secondary-light);
}

.footer-column li a:hover {
  color: var(--accent-primary-light);
  text-decoration: none;
}

.footer-column.contact address {
  font-style: normal;
  line-height: 1.8;
  color: var(--text-secondary-light);
}

.footer-column.contact address a {
  color: var(--text-secondary-light);
}

.footer-bottom-bar {
  border-top: 1px solid var(--border-color-light);
  padding-top: var(--spacing-xl);
  text-align: center;
  color: var(--text-tertiary-light);
}

#cookie-banner a {
  color: var(--accent-primary-light) !important;
}

#accept-cookies {
  background-color: var(--accent-primary-light) !important;
}

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

.fade-in-element.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1024px) {
  h1 {
    font-size: clamp(2rem, 6vw, 3rem);
  }
  h2 {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
  }

  :root {
    --section-padding: 80px;
  }

  .nav-menu {
    gap: var(--spacing-l);
  }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    order: 2;
  }
  .hero-image-container {
    order: 1;
    margin-bottom: var(--spacing-xl);
  }
  .hero-content .subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .case-study,
  .case-study:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .case-study:nth-child(even) .case-study-image {
    order: 1;
  }
  .case-study-image {
    max-height: 300px;
  }

  .newsletter-signup .container {
    flex-direction: column;
    text-align: center;
  }

  .newsletter-content {
    margin-bottom: var(--spacing-xl);
  }

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

@media (max-width: 768px) {
  :root {
    --section-padding: 60px;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--bg-primary-light);
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--border-color-light);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
    text-align: center;
  }

  .nav-menu a {
    padding: var(--spacing-m) 0;
    display: block;
    width: 100%;
  }

  .navigation .cta-button {
    display: none;
  }

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

  .tab-buttons {
    flex-direction: column;
    border-bottom: none;
    align-items: stretch;
  }

  .tab-button {
    border-bottom: 2px solid var(--border-color-light);
    justify-content: center;
    border-radius: var(--border-radius-sm);
  }

  .tab-button.active {
    background-color: var(--bg-tertiary-light);
  }

  #newsletter-form {
    flex-direction: column;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-column.about p {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (min-width: 1600px) {
  :root {
    --base-font-size: 18px;
    --max-width-large: 1400px;
  }
}

@media (min-width: 2000px) {
  :root {
    --base-font-size: 20px;
    --max-width-large: 1600px;
  }
}