:root {
  --color-primary: #007aff;
  --color-secondary: #5856d6;
  --color-accent: #ff2d55;
  --color-success: #34c759;
  --color-error: #ff3b30;
  --color-warning: #ff9500;
  --color-text-dark: #1d1d1f;
  --color-text-light: #86868b;
  --color-border: #d2d2d7;
  --color-bg-light: #f5f5f7;
  --color-bg-white: #ffffff;
  --color-bg-dark: #1d1d1f;
  --color-overlay: rgba(0, 0, 0, 0.8);
  --color-gloss: rgba(255, 255, 255, 0.12);
  --color-neutral-100: #f5f5f7;
  --color-neutral-200: #e8e8ed;
  --color-neutral-300: #d2d2d7;
  --color-neutral-700: #6e6e73;
  --color-neutral-800: #424245;
  --color-neutral-900: #1d1d1f;
  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', 'Helvetica Neue', sans-serif;
  --font-size-xs: clamp(0.75rem, 2vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 2.5vw, 1rem);
  --font-size-base: clamp(1rem, 3vw, 1.0625rem);
  --font-size-lg: clamp(1.125rem, 3.5vw, 1.25rem);
  --font-size-xl: clamp(1.5rem, 5vw, 1.75rem);
  --font-size-2xl: clamp(2rem, 6vw, 2.5rem);
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.1;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --logo-w: 160px;
  --logo-h: 44px;
  --header-h: 64px;
  --header-h-mobile: 56px;
  --container-w: 1280px;
  --container-padding: clamp(1.5rem, 5vw, 3rem);
  --z-base: 1;
  --z-nav: 1000;
  --z-modal: 1100;
  --z-tooltip: 1200;
  --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 12px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
  --shadow-gloss: 0 8px 32px rgba(255, 255, 255, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-menu: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 18px;
  --border-radius-xl: 24px;
}

/* Header */
.dr-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: var(--header-h);
  background-color: var(--color-bg-white);
  border-bottom: 1px solid var(--color-neutral-200);
  box-shadow: var(--shadow-sm);
}

.dr-header-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.dr-header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.dr-header-logo {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  width: var(--logo-w);
  height: var(--logo-h);
  font-family: var(--font-family);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-neutral-900);
  text-decoration: none;
}

.dr-header-logo-text-accent {
  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-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-800);
  text-decoration: none;
  position: relative;
  padding-block: 0.25rem;
  transition: color var(--transition-fast);
}

.dr-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 999px;
  transition: width var(--transition-fast);
}

.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: none;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--color-neutral-200);
  background: var(--color-bg-white);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.dr-burger-box {
  width: 18px;
  height: 14px;
  position: relative;
}

.dr-burger-line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-neutral-900);
  transition: transform var(--transition-menu), opacity var(--transition-menu), top var(--transition-menu), bottom var(--transition-menu);
}

.dr-burger-line:nth-child(1) {
  top: 0;
}

.dr-burger-line:nth-child(2) {
  top: 6px;
}

.dr-burger-line:nth-child(3) {
  bottom: 0;
}

.dr-header.dr-open .dr-burger-line:nth-child(1) {
  top: 6px;
  transform: rotate(45deg);
}

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

.dr-header.dr-open .dr-burger-line:nth-child(3) {
  bottom: 6px;
  transform: rotate(-45deg);
}

.dr-burger:hover,
.dr-burger:focus-visible {
  outline: none;
  background-color: var(--color-neutral-100);
  border-color: var(--color-neutral-300);
  box-shadow: var(--shadow-sm);
}

/* Mobile menu */
.dr-mobile-menu {
  display: none;
  position: fixed;
  inset: var(--header-h-mobile) 0 0 0;
  background: var(--color-bg-white);
  z-index: calc(var(--z-nav) - 1);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

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

.dr-mobile-menu-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: var(--space-lg) var(--container-padding) var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

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

.dr-mobile-nav-link {
  font-family: var(--font-family);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-900);
  text-decoration: none;
  padding-block: 0.25rem;
}

.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-100);
  border-top: 1px solid var(--color-neutral-800);
  padding: var(--space-3xl) 0 var(--space-xl);
  font-family: var(--font-family);
}

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

.dr-footer-top {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1.4fr) minmax(0, 1.4fr) minmax(0, 1.8fr);
  gap: var(--space-2xl);
  align-items: flex-start;
  margin-bottom: var(--space-2xl);
}

.dr-footer-brand {
  max-width: 320px;
}

.dr-footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: var(--space-sm);
  text-decoration: none;
}

.dr-footer-logo-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  color: var(--color-bg-white);
}

.dr-footer-tagline {
  margin: 0;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-light);
}

.dr-footer-heading {
  margin: 0 0 var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-neutral-300);
}

.dr-footer-nav-list,
.dr-footer-legal-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.dr-footer-nav-link,
.dr-footer-legal-link {
  font-size: var(--font-size-sm);
  color: var(--color-neutral-100);
  text-decoration: none;
  opacity: 0.9;
  transition: color var(--transition-fast), opacity var(--transition-fast), transform var(--transition-fast);
}

.dr-footer-nav-link:hover,
.dr-footer-nav-link:focus-visible,
.dr-footer-legal-link:hover,
.dr-footer-legal-link:focus-visible {
  color: var(--color-primary);
  opacity: 1;
}

.dr-footer-contact-block {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: var(--font-size-sm);
}

.dr-footer-contact-item {
  margin: 0;
  color: var(--color-neutral-100);
}

.dr-footer-contact-label {
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-300);
  margin-right: 0.25rem;
}

.dr-footer-contact-link {
  color: inherit;
  text-decoration: none;
}

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

.dr-footer-bottom {
  border-top: 1px solid var(--color-neutral-800);
  padding-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.dr-footer-disclaimer {
  margin: 0 0 var(--space-xs);
  font-size: var(--font-size-xs);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-light);
}

.dr-footer-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.dr-footer-meta {
  margin: 0;
  font-size: var(--font-size-xs);
  color: var(--color-neutral-300);
}

/* Responsive layout */
@media (max-width: 767px) {
  .dr-header {
    height: var(--header-h-mobile);
  }

  .dr-header-inner {
    padding-inline: var(--space-md);
  }

  .dr-nav {
    display: none;
  }

  .dr-burger {
    display: flex;
  }

  .dr-mobile-menu {
    inset: var(--header-h-mobile) 0 0 0;
  }

  .dr-footer {
    padding-top: var(--space-2xl);
  }

  .dr-footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .dr-footer-inner {
    padding-inline: var(--space-md);
  }
}

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

  .dr-burger {
    display: none;
  }

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

@media (min-width: 1024px) {
  .dr-footer-top {
    gap: var(--space-3xl);
  }
}