:root {
  --color-bg-primary: #0E1016;
  --color-bg-secondary: #1A2030;
  --color-bg-tertiary: #252E42;
  --color-text-primary: #F5F4F2;
  --color-text-secondary: #C1CAD8;
  --color-accent-primary: #4AA3FF;
  --color-accent-danger: #E14B5A;
  --color-accent-magic: #8B5CF6;
  --color-accent-gold: #F3A63C;
  --color-border-subtle: #39465A;

  --font-heading: "UnifrakturCook", "EB Garamond", Georgia, serif;
  --font-body: Inter, "Segoe UI", Arial, sans-serif;

  --fs-xxl: clamp(2.2rem, 4vw, 3.5rem);
  --fs-xl: clamp(1.8rem, 3vw, 2.5rem);
  --fs-lg: clamp(1.6rem, 2.4vw, 2rem);
  --fs-md: 1.5rem;
  --fs-sm: 1.25rem;
  --fs-base: 1rem;
  --fs-xs: 0.875rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 7rem;

  --container-max: 1200px;
  --container-pad: clamp(1rem, 4vw, 3rem);

  --radius-sm: 0.5rem;
  --radius-lg: 1.5rem;

  --border-subtle: 1px solid var(--color-border-subtle);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  min-width: 0;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

a:hover,
a:focus-visible {
  color: var(--color-accent-primary);
  text-shadow: 0 0 6px rgba(74,163,255,0.4);
}

ul {
  list-style: none !important;
  padding: 0;
  margin: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin: 0 0 var(--space-3);
}

h1 { font-size: var(--fs-xxl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); }
h5 { font-size: var(--fs-sm); }
h6 { font-size: var(--fs-base); }

p {
  margin: 0 0 var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--fs-base);
}

blockquote {
  margin: 0 0 var(--space-4);
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-accent-magic);
  color: var(--color-text-secondary);
}

ol {
  margin: 0 0 var(--space-3);
  padding-left: var(--space-4);
}

section {
  padding: var(--space-5) var(--container-pad);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.surface {
  background: var(--color-bg-secondary);
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
}

.surface-elevated {
  background: var(--color-bg-tertiary);
  border: var(--border-subtle);
  border-radius: var(--radius-lg);
}

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

.accent {
  color: var(--color-accent-primary);
}

.flex {
  display: flex;
  gap: var(--space-3);
}

.flex-row {
  flex-direction: row;
  align-items: center;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-between {
  justify-content: space-between;
}

.flex-center {
  justify-content: center;
  align-items: center;
}

.stack > * + * {
  margin-top: var(--space-3);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6em 1.2em;
  border: 1px solid var(--color-accent-primary);
  color: var(--color-text-primary);
  background: transparent;
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover,
.button:focus-visible {
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 10px rgba(74,163,255,0.35);
}

.input {
  width: 100%;
  padding: 0.6em 0.75em;
  background: var(--color-bg-secondary);
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 8px rgba(74,163,255,0.35);
}

.nav-toggle {
  display: flex;
  flex-direction: row;
  gap: 4px;
}

@media (max-width: 768px) {
  .nav-toggle {
    flex-direction: column;
  }
}

.progress-indicator {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--color-accent-primary);
  width: 0%;
  z-index: 999;
}

.bookmark {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-4);
  background: var(--color-bg-secondary);
  border: var(--border-subtle);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
}

:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}

::selection {
  background: var(--color-accent-magic);
  color: #fff;
}

.surface > *:last-child,
.surface-elevated > *:last-child,
.container > *:last-child {
  margin-bottom: 0;
}