:root {
  --color-bg-primary: #050605;
  --color-bg-secondary: #101211;
  --color-bg-elevated: #191b19;
  --color-bg-warm: #171512;
  --color-text-primary: #f1eee6;
  --color-text-secondary: #c7c0b4;
  --color-text-muted: #918a7e;
  --color-accent-blue: #5e9bbd;
  --color-accent-blue-soft: #8bb8cf;
  --color-accent-gold: #c49a55;
  --color-accent-gold-soft: #b7864a;
  --color-accent-copper: #a86f3c;
  --color-warm-structural: var(--color-accent-copper);
  --color-warm-editorial: var(--color-accent-gold-soft);
  --color-warm-primary: var(--color-accent-gold);
  --rgb-warm-structural: 168 111 60;
  --rgb-warm-editorial: 183 134 74;
  --rgb-warm-primary: 196 154 85;
  --rgb-warm-primary-bright: 221 189 123;
  --rgb-warm-primary-deep: 149 105 42;
  --color-header-separator: rgb(var(--rgb-warm-structural) / 0.44);
  --color-header-separator-strong: rgb(var(--rgb-warm-structural) / 0.58);
  --color-border: rgba(241, 238, 230, 0.14);
  --color-border-strong: rgba(241, 238, 230, 0.3);
  --color-focus: #f0c46d;
  --color-success: #8db58a;
  --color-error: #d98d8d;

  --font-display: Georgia, "Times New Roman", serif;
  --font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-md: 1.125rem;
  --text-lg: 1.375rem;
  --text-xl: 1.75rem;
  --text-section-title: 1.95rem;
  --text-book-title: 2.15rem;
  --text-hero-title: 2.55rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  --width-text-narrow: 34rem;
  --width-text: 44rem;
  --width-content: 76rem;
  --width-wide: 90rem;
  --container-gutter: 1.5rem;

  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;

  --border-subtle: 1px solid var(--color-border);
  --shadow-soft: 0 1rem 3rem rgba(0, 0, 0, 0.28);
  --glow-blue: 0 0 2.5rem rgba(94, 155, 189, 0.2);
  --glow-gold: 0 0 2rem rgb(var(--rgb-warm-primary) / 0.16);

  --duration-fast: 160ms;
  --duration-medium: 320ms;
  --ease-standard: cubic-bezier(0.2, 0.7, 0.2, 1);

  --header-height: 4.75rem;
  --anchor-offset: calc(var(--header-height) + var(--space-5));
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: var(--anchor-offset);
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body.is-menu-open {
  overflow: hidden;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-warm-primary);
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

::selection {
  background: rgb(var(--rgb-warm-primary) / 0.35);
  color: var(--color-text-primary);
}

h1,
h2,
h3,
p {
  margin-block-start: 0;
}

h1,
h2,
h3 {
  color: var(--color-text-primary);
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.05;
}

h1 {
  font-size: var(--text-hero-title);
}

h2 {
  font-size: var(--text-section-title);
}

h3 {
  font-size: var(--text-xl);
}

p {
  margin-block-end: var(--space-4);
}

ul,
ol {
  margin-block: 0;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-3);
  inset-inline-start: var(--space-3);
  z-index: 100;
  transform: translateY(-150%);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-text-primary);
  color: var(--color-bg-primary);
  padding: var(--space-3) var(--space-4);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(100% - (var(--container-gutter) * 2), var(--width-content));
  margin-inline: auto;
}

.container--wide {
  width: min(100% - (var(--container-gutter) * 2), var(--width-wide));
}

.container--text {
  width: min(100% - (var(--container-gutter) * 2), var(--width-text));
}

.container--narrow {
  width: min(100% - (var(--container-gutter) * 2), var(--width-text-narrow));
}

.section {
  position: relative;
  isolation: isolate;
  padding-block: clamp(4rem, 10vw, 8rem);
  scroll-margin-top: var(--anchor-offset);
}

.section--charcoal {
  background:
    radial-gradient(circle at 15% 20%, rgb(var(--rgb-warm-editorial) / 0.08), transparent 34rem),
    var(--color-bg-secondary);
}

.prose {
  max-width: var(--width-text);
  color: var(--color-text-secondary);
}

.prose p:last-child {
  margin-block-end: 0;
}

.form-field__label {
  display: block;
  margin-block-end: var(--space-2);
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  font-weight: 700;
}

.form-field__control {
  width: 100%;
  min-height: 3.25rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: rgba(5, 6, 5, 0.7);
  color: var(--color-text-primary);
  padding: 0.85rem 1rem;
}

.form-field__control:focus {
  border-color: var(--color-warm-primary);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

@media (min-width: 48rem) {
  :root {
    --container-gutter: 2rem;
    --text-section-title: 2.35rem;
    --text-book-title: 2.75rem;
    --text-hero-title: 3.55rem;
  }
}

@media (min-width: 64rem) {
  :root {
    --container-gutter: 3rem;
  }
}

@media (min-width: 80rem) {
  :root {
    --container-gutter: 4rem;
    --text-section-title: 2.65rem;
    --text-book-title: 3.2rem;
    --text-hero-title: 4.35rem;
  }
}