:root {
  --color-primary: #2C5F7C;
  --color-secondary: #4A90A4;
  --color-accent: #88C9D4;
  --color-bg-light: #FAFBFC;
  --color-bg-dark: #1A1F2E;
  --color-text-primary: #1A1F2E;
  --color-text-light: #5A6B7D;
  --color-border: #E1E4E8;
  --color-success: #2ECC71;
  --color-error: #E74C3C;
  --color-warning: #F39C12;
  --color-white: #FFFFFF;
  --color-neutral-50: #F8F9FA;
  --color-neutral-100: #E9ECEF;
  --color-neutral-200: #DEE2E6;
  --color-neutral-800: #2D3748;
  --color-neutral-900: #1A202C;
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'SF Pro Display', Roboto, Helvetica, Arial, sans-serif;
  --font-secondary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'SF Pro Display', Roboto, Helvetica, Arial, sans-serif;
  --fs-xs: clamp(0.75rem, 1vw, 0.875rem);
  --fs-sm: clamp(0.875rem, 1.2vw, 1rem);
  --fs-base: clamp(1rem, 1.5vw, 1.125rem);
  --fs-lg: clamp(1.125rem, 2vw, 1.375rem);
  --fs-xl: clamp(1.375rem, 2.5vw, 1.75rem);
  --fs-2xl: clamp(1.75rem, 3.5vw, 2.25rem);
  --fs-3xl: clamp(2.25rem, 5vw, 3.5rem);
  --fw-normal: 400;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 5rem;
  --space-5xl: 6rem;
  --logo-w: 160px;
  --logo-h: 44px;
  --header-h: 72px;
  --container-w: 1280px;
  --container-p: 1.5rem;
  --bp-sm: 640px;
  --bp-md: 768px;
  --bp-lg: 1024px;
  --bp-xl: 1280px;
  --bp-2xl: 1536px;
  --z-nav: 1000;
  --z-modal: 1001;
  --z-dropdown: 1002;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slower: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-full: 9999px;
  --nav-h: 72px;
}

/* Header */
.dr-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.dr-header-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--container-p);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-primary);
}

.dr-header-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.dr-header-logo-text {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

/* Desktop nav */
.dr-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.dr-nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.dr-nav-link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-base);
}

.dr-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.1rem;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.dr-nav-link:hover,
.dr-nav-link:focus-visible {
  color: var(--color-primary);
}

.dr-nav-link:hover::after,
.dr-nav-link:focus-visible::after {
  width: 100%;
}

/* Burger */
.dr-burger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.dr-burger-line {
  width: 22px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 999px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.dr-header.dr-open .dr-burger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.dr-header.dr-open .dr-burger-line:nth-child(2) {
  opacity: 0;
}

.dr-header.dr-open .dr-burger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu - required behavior */
.dr-mobile-menu {
  display: none;
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.dr-header.dr-open + .dr-mobile-menu {
  display: block;
}

.dr-mobile-menu-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: var(--space-md) var(--container-p) var(--space-lg);
  font-family: var(--font-primary);
}

.dr-mobile-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.dr-mobile-nav-link {
  display: block;
  padding: var(--space-sm) 0;
  font-size: var(--fs-base);
  color: var(--color-text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}

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

.dr-mobile-nav-link:hover,
.dr-mobile-nav-link:focus-visible {
  color: var(--color-primary);
}

/* Footer */
.dr-footer {
  background-color: var(--color-bg-dark);
  color: var(--color-neutral-50);
  font-family: var(--font-primary);
  padding: var(--space-3xl) var(--container-p) var(--space-xl);
}

.dr-footer-inner {
  max-width: var(--container-w);
  margin: 0 auto;
}

.dr-footer-top {
  display: grid;
  gap: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: var(--space-2xl);
}

.dr-footer-brand-block {
  max-width: 360px;
}

.dr-footer-logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  margin-bottom: var(--space-sm);
}

.dr-footer-logo-text {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-white);
}

.dr-footer-description {
  margin: 0;
  margin-top: var(--space-sm);
  font-size: var(--fs-sm);
  color: var(--color-neutral-100);
}

.dr-footer-columns {
  display: grid;
  gap: var(--space-xl);
}

.dr-footer-heading {
  margin: 0 0 var(--space-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-neutral-100);
}

.dr-footer-nav-list,
.dr-footer-legal-list,
.dr-footer-contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.dr-footer-nav-item,
.dr-footer-legal-item,
.dr-footer-contact-item {
  margin-bottom: var(--space-sm);
}

.dr-footer-link {
  font-size: var(--fs-sm);
  color: var(--color-neutral-50);
  text-decoration: none;
  transition: color var(--transition-base);
}

.dr-footer-link:hover,
.dr-footer-link:focus-visible {
  color: var(--color-accent);
}

.dr-footer-contact-label {
  display: block;
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-neutral-100);
  margin-bottom: var(--space-xs);
}

.dr-footer-contact-text {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--color-neutral-50);
}

.dr-footer-bottom {
  padding-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.dr-footer-disclaimer {
  margin: 0;
  font-size: var(--fs-xs);
  color: var(--color-neutral-100);
  line-height: 1.5;
}

.dr-footer-meta {
  margin: 0;
  font-size: var(--fs-xs);
  color: var(--color-neutral-100);
}

/* Responsive rules */
@media (max-width: 767px) {
  .dr-nav {
    display: none;
  }

  .dr-burger {
    display: inline-flex;
  }

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

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

@media (min-width: 768px) {
  .dr-nav {
    display: flex;
  }

  .dr-burger {
    display: none;
  }

  .dr-mobile-menu {
    display: none !important;
  }

  .dr-footer-top {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 2fr);
    align-items: flex-start;
  }

  .dr-footer-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .dr-footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}