:root {
  --font-primary: "system-ui", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;

  --color-light-bg: #f8f9fa;
  --color-light-bg-secondary: #ffffff;
  --color-light-text-primary: #212529;
  --color-light-text-secondary: #5a6169;
  --color-light-border: #dee2e6;
  --color-light-accent-primary: #0052cc;
  --color-light-accent-primary-hover: #0041a3;
  --color-light-accent-secondary: #e6f0ff;
  --color-light-shadow: rgba(0, 0, 0, 0.05);

  --color-dark-bg: #121212;
  --color-dark-bg-secondary: #1e1e1e;
  --color-dark-text-primary: #e8e6e3;
  --color-dark-text-secondary: #a8a29a;
  --color-dark-border: #333333;
  --color-dark-accent-primary: #4d94ff;
  --color-dark-accent-primary-hover: #75adff;
  --color-dark-accent-secondary: #2a2a2a;
  --color-dark-shadow: rgba(0, 0, 0, 0.2);

  --transition-fast: 0.2s ease-in-out;
  --transition-medium: 0.4s ease-in-out;

  --spacing-xs: 0.25rem;
  --spacing-s: 0.5rem;
  --spacing-m: 1rem;
  --spacing-l: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 4rem;

  --border-radius-s: 4px;
  --border-radius-m: 8px;
  --border-radius-l: 16px;

  --font-size-xs: clamp(0.75rem, 0.5vw + 0.6rem, 0.875rem);
  --font-size-s: clamp(0.875rem, 0.5vw + 0.7rem, 1rem);
  --font-size-m: clamp(1rem, 1vw + 0.75rem, 1.125rem);
  --font-size-l: clamp(1.25rem, 1.5vw + 0.8rem, 1.75rem);
  --font-size-xl: clamp(1.8rem, 4vw + 1rem, 3.5rem);
  --font-size-xxl: clamp(2.5rem, 6vw + 1.2rem, 4.5rem);
}

@media (prefers-color-scheme: light) {
  body {
    --color-bg: var(--color-light-bg);
    --color-bg-secondary: var(--color-light-bg-secondary);
    --color-text-primary: var(--color-light-text-primary);
    --color-text-secondary: var(--color-light-text-secondary);
    --color-border: var(--color-light-border);
    --color-accent-primary: var(--color-light-accent-primary);
    --color-accent-primary-hover: var(--color-light-accent-primary-hover);
    --color-accent-secondary: var(--color-light-accent-secondary);
    --color-shadow-main: var(--color-light-shadow);
  }
}

@media (prefers-color-scheme: dark) {
  body {
    --color-bg: var(--color-dark-bg);
    --color-bg-secondary: var(--color-dark-bg-secondary);
    --color-text-primary: var(--color-dark-text-primary);
    --color-text-secondary: var(--color-dark-text-secondary);
    --color-border: var(--color-dark-border);
    --color-accent-primary: var(--color-dark-accent-primary);
    --color-accent-primary-hover: var(--color-dark-accent-primary-hover);
    --color-accent-secondary: var(--color-dark-accent-secondary);
    --color-shadow-main: var(--color-dark-shadow);
  }
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
}

.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-l);
  padding-right: var(--spacing-l);
}

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

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

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

ul {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-xxl);
}
h2 {
  font-size: var(--font-size-xl);
}
h3 {
  font-size: var(--font-size-l);
}
h4 {
  font-size: var(--font-size-m);
}
h5 {
  font-size: var(--font-size-s);
}
p {
  font-size: var(--font-size-m);
  color: var(--color-text-secondary);
}

.button {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  font-size: var(--font-size-s);
  font-weight: 600;
  text-align: center;
  border-radius: var(--border-radius-m);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.button--primary:hover {
  background-color: var(--color-accent-primary-hover);
  border-color: var(--color-accent-primary-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 82, 204, 0.2);
}

.button--large {
  padding: 1rem 2rem;
  font-size: var(--font-size-m);
}

.button--white {
  background-color: #fff;
  color: var(--color-light-accent-primary);
  border-color: #fff;
}

.button--white:hover {
  background-color: #f0f0f0;
  border-color: #f0f0f0;
  color: var(--color-light-accent-primary-hover);
}

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

.section-header__subtitle {
  display: block;
  font-size: var(--font-size-s);
  font-weight: 600;
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-s);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.section-header__title {
  margin-bottom: var(--spacing-m);
}

.section-header__description {
  max-width: 650px;
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  background-color: transparent;
  padding: var(--spacing-m) 0;
  transition: background-color var(--transition-fast),
    box-shadow var(--transition-fast), padding var(--transition-fast);
}

.header.scrolled {
  background-color: var(--color-bg-secondary);
  box-shadow: 0 2px 10px var(--color-shadow-main);
  padding: var(--spacing-s) 0;
}

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

.header__logo-text {
  font-size: var(--font-size-l);
  font-weight: 800;
  color: var(--color-text-primary);
}

.header__logo-link {
  text-decoration: none;
}

.header__nav-list {
  display: flex;
  gap: var(--spacing-l);
}

.header__nav-link {
  font-size: var(--font-size-s);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  position: relative;
  padding: var(--spacing-xs) 0;
}

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

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

.header__nav-link:hover {
  color: var(--color-text-primary);
}

.header__mobile-menu-toggle {
  display: none;
}

.header__mobile-icon {
  width: 2rem;
  height: 2rem;
  color: var(--color-text-primary);
  cursor: pointer;
}

.hero-section {
  padding-top: 6rem;
  padding-bottom: 6rem;
  text-align: center;
}

.hero-section__content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-section__title {
  margin-bottom: var(--spacing-l);
}

.hero-section__subtitle {
  font-size: var(--font-size-m);
  margin-bottom: var(--spacing-xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

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

.feature-card {
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-l);
  border: 1px solid var(--color-border);
  text-align: left;
  height: 100%;
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px var(--color-shadow-main);
}

.feature-card__icon-wrapper {
  margin-bottom: var(--spacing-m);
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-secondary);
  border-radius: var(--border-radius-m);
}

.feature-card__icon {
  width: 1.75rem;
  height: 1.75rem;
  color: var(--color-accent-primary);
}

.feature-card__title {
  margin-bottom: var(--spacing-s);
}

.case-studies-section {
  background-color: var(--color-bg-secondary);
}

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

.case-study-card {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-m);
  padding: var(--spacing-l);
  background: var(--color-bg);
}

.case-study-card__quote {
  font-style: italic;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-m);
}

.case-study-card__author-info {
  display: flex;
  align-items: center;
}

.case-study-card__author-name {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0;
}

.case-study-card__author-goal {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

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

.mission-vision-card {
  padding: var(--spacing-xl);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-l);
  height: 100%;
}

.mission-vision-card__title {
  margin-bottom: var(--spacing-m);
  color: var(--color-accent-primary);
}

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

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

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

.team-member-card__icon-wrapper {
  width: 100px;
  height: 100px;
  margin: 0 auto var(--spacing-m);
  border-radius: 50%;
  background-color: var(--color-accent-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-accent-primary);
}

.team-member-card__icon {
  width: 3rem;
  height: 3rem;
  color: var(--color-accent-primary);
}

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

.team-member-card__role {
  font-size: var(--font-size-s);
}

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

.testimonial-card {
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-l);
  border-radius: var(--border-radius-m);
  border-left: 4px solid var(--color-accent-primary);
}

.testimonial-card__rating {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-m);
  color: #ffc107;
}

.testimonial-card__star-icon {
  width: 1.25rem;
  height: 1.25rem;
}

.testimonial-card__text {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-m);
}

.testimonial-card__author-name {
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
}

.faq-section {
  background-color: var(--color-bg-secondary);
}

.faq-section__accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-m);
}

.faq-section__accordion-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-m);
  overflow: hidden;
}

.faq-section__accordion-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-l);
  cursor: pointer;
  list-style: none;
}

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

.faq-section__accordion-title {
  margin: 0;
}

.faq-section__accordion-icon-wrapper {
  transition: transform var(--transition-fast);
}

.faq-section__accordion-icon {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-accent-primary);
}

.faq-section__accordion-item[open] .faq-section__accordion-icon-wrapper {
  transform: rotate(45deg);
}

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

.faq-section__accordion-content p {
  margin: 0;
  max-width: 95%;
}

.faq-section__accordion-content a {
  font-weight: 600;
}

.faq-section__more-questions {
  text-align: center;
  margin-top: var(--spacing-xl);
}

.cta-section {
  background-color: var(--color-accent-primary);
  text-align: center;
  color: #fff;
  padding: var(--spacing-xxl) 0;
}

.cta-section__title,
.cta-section__description {
  color: #fff;
}

.cta-section__title {
  margin-bottom: var(--spacing-m);
}

.cta-section__description {
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  opacity: 0.9;
}

.footer {
  background-color: var(--color-bg-secondary);
  padding-top: var(--spacing-xxl);
  font-size: var(--font-size-s);
}

.footer__main-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

.footer__about-section {
  flex-basis: 100%;
  max-width: 300px;
}

.footer__logo {
  font-size: var(--font-size-l);
  margin-bottom: var(--spacing-m);
}

.footer__links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  flex-grow: 1;
  justify-content: flex-end;
}

.footer__links-column {
  min-width: 150px;
}

.footer__links-title {
  font-size: var(--font-size-s);
  font-weight: 600;
  margin-bottom: var(--spacing-m);
  color: var(--color-text-primary);
}

.footer__link-item {
  margin-bottom: var(--spacing-s);
}

.footer__link {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer__link:hover {
  color: var(--color-accent-primary);
  text-decoration: underline;
}

.footer__bottom-bar {
  padding: var(--spacing-l) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.cookie-notice {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-dark-bg);
  color: var(--color-dark-text-primary);
  z-index: 2000;
  padding: var(--spacing-m);
  transform: translateY(100%);
  transition: transform var(--transition-medium);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
}

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

.cookie-notice__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-m);
  max-width: 1280px;
  margin: 0 auto;
}

.cookie-notice__text {
  color: var(--color-dark-text-primary);
  margin: 0;
  flex-grow: 1;
}

.cookie-notice__link {
  color: var(--color-dark-accent-primary);
  font-weight: 600;
}

.cookie-notice__button {
  padding: var(--spacing-s) var(--spacing-l);
  background-color: var(--color-dark-accent-primary);
  color: #fff;
  border: none;
  border-radius: var(--border-radius-m);
  cursor: pointer;
  flex-shrink: 0;
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

@media (max-width: 768px) {
  .header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-bg-secondary);
    box-shadow: 0 4px 10px var(--color-shadow-main);
  }

  .header__nav.active {
    display: block;
  }

  .header__nav-list {
    flex-direction: column;
    padding: var(--spacing-l);
    gap: 0;
  }

  .header__nav-item {
    width: 100%;
  }

  .header__nav-link {
    display: block;
    padding: var(--spacing-m) 0;
    border-bottom: 1px solid var(--color-border);
  }

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

  .header__actions {
    display: none;
  }

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

  .mission-vision-section__grid {
    grid-template-columns: 1fr;
  }

  .footer__main-content,
  .footer__links-grid {
    flex-direction: column;
    text-align: center;
  }

  .footer__links-grid {
    align-items: center;
  }

  .footer__about-section {
    max-width: 100%;
  }
}