:root {
  --color-primary: #2C5282;
  --color-primary-hover: #1A365D;
  --color-accent: #D69E2E;
  --color-accent-hover: #B7791F;
  --color-neutral-50: #FAFAFA;
  --color-neutral-100: #F7FAFC;
  --color-neutral-200: #EDF2F7;
  --color-neutral-300: #E2E8F0;
  --color-neutral-400: #CBD5E0;
  --color-neutral-500: #A0AEC0;
  --color-neutral-600: #718096;
  --color-neutral-700: #4A5568;
  --color-neutral-800: #2D3748;
  --color-neutral-900: #1A202C;
  --color-success: #38A169;
  --color-error: #E53E3E;
  --color-warning: #DD6B20;
  --color-text: #1A202C;
  --color-text-light: #4A5568;
  --color-text-muted: #718096;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7FAFC;
  --color-bg-light: #EDF2F7;
  --font-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 16px;
  --font-size-sm: clamp(0.875rem, 1.5vw, 0.9375rem);
  --font-size-md: clamp(1rem, 2vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 2.5vw, 1.375rem);
  --font-size-xl: clamp(1.5rem, 3.5vw, 2rem);
  --font-size-2xl: clamp(2rem, 5vw, 3rem);
  --font-size-3xl: clamp(2.5rem, 6vw, 4rem);
  --line-height-tight: 1.25;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.75;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --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: 6rem;
  --header-h: 80px;
  --container-max-w: 1280px;
  --container-pad-x: var(--space-lg);
  --z-nav: 1000;
  --z-modal: 2000;
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 350ms;
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --border-radius-sm: 6px;
  --border-radius-md: 10px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  --transition-base: all var(--duration-base) var(--ease-in-out);
}

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

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

.dr-header-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  text-decoration: none;
}

.dr-header-logo-text {
  color: var(--color-primary);
}

.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-family: var(--font-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-xs) 0;
  position: relative;
  transition: var(--transition-base);
}

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

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

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

/* Burger */
.dr-burger {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--color-neutral-300);
  background-color: var(--color-bg);
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-base);
}

.dr-burger-box {
  width: 20px;
  height: 16px;
  position: relative;
}

.dr-burger-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 999px;
  transition: var(--transition-base);
}

.dr-burger-line:nth-child(1) { top: 0; }
.dr-burger-line:nth-child(2) { top: 7px; }
.dr-burger-line:nth-child(3) { top: 14px; }

.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);
}

.dr-burger:hover,
.dr-burger:focus-visible {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

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

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

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

.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-family: var(--font-base);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-neutral-200);
}

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

/* Footer */
.dr-footer {
  background-color: var(--color-neutral-900);
  color: var(--color-neutral-100);
  padding: var(--space-3xl) var(--container-pad-x) var(--space-xl);
}

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

.dr-footer-top {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.dr-footer-brand-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.dr-footer-logo-text {
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
}

.dr-footer-disclaimer {
  font-size: var(--font-size-sm);
  color: var(--color-neutral-400);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

.dr-footer-heading {
  font-family: var(--font-heading);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--space-md);
}

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

.dr-footer-link {
  font-size: var(--font-size-sm);
  color: var(--color-neutral-300);
  text-decoration: none;
  transition: var(--transition-base);
}

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

.dr-footer-contact-item {
  font-size: var(--font-size-sm);
  color: var(--color-neutral-300);
}

.dr-footer-contact-label {
  font-weight: var(--font-weight-semibold);
  color: var(--color-neutral-100);
}

.dr-footer-bottom {
  border-top: 1px solid var(--color-neutral-800);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}

.dr-footer-meta {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-neutral-500);
}

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

  .dr-burger {
    display: flex;
  }

  .dr-footer {
    padding: var(--space-2xl) var(--container-pad-x) var(--space-lg);
  }

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

  .dr-footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

  .dr-burger {
    display: none;
  }

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