/* Base CSS variables derived from the Ritual of Communion design system */

:root {
  /* Identity fonts */
  --font-display: "EB Garamond", Georgia, "Times New Roman", serif;
  --font-body: "Lato", "Helvetica Neue", Arial, sans-serif;

  /* Color tokens from print design adapted for web accessibility */
  --color-paper: #ffffff;
  --color-ink: #38343a;
  --color-heading: #493f4b;
  --color-plum: #765f72;
  --color-muted: #68646a;
  --color-sage-strong: #546b57;
  --color-clay-strong: #8a5549;
  --color-sage-soft: #778779;
  --color-clay-soft: #ab776c;
  --color-rule: #ddd8d5;
  --color-pale-number: #ede6e3;

  /* Spacing scale based on 4px */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;

  /* Layout */
  --content-width: 68ch;
  --site-padding: clamp(20px, 5vw, 56px);
  --nav-width: clamp(240px, 25vw, 360px);
  --rule-width: 1px;
  --focus: #493f4b;

  /* Motion */
  --motion-standard: 0.2s ease;
}

/* Reset and base styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--color-paper);
  color: var(--color-ink);
  font: 400 18px/1.62 var(--font-body);
  margin: 0;
  padding: 0;
}

/* Ensure main element has no default margins */
main {
  margin: 0;
  padding: 0;
}

/* Reading column */
.reading-column {
  width: min(var(--content-width), 100%);
  margin-inline: auto;
  margin-block: 0;
  padding-left: var(--site-padding);
  padding-right: var(--site-padding);
}

/* Typography */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--color-heading);
}

h1 {
  font-size: clamp(3rem, 6vw, 5.25rem);
  line-height: 1.02;
}

h2 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.08;
}

h3 {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  line-height: 1.12;
}

/* Component styles from design system */
Eyebrow {
  font: 600 0.75rem/1.4 var(--font-body);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-plum);
}

.exercise-prompt {
  margin-block: var(--space-8);
  padding-left: var(--space-6);
  border-left: 2px solid var(--color-clay-strong);
  font: italic 1.5rem/1.4 var(--font-display);
  color: var(--color-plum);
}

.editorial-rule {
  border: 0;
  border-top: 1px solid var(--color-rule);
}

.stage-number {
  color: var(--color-pale-number);
  font: 400 clamp(5rem, 14vw, 9rem)/1 var(--font-display);
  user-select: none;
}

/* Focus styles */
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

/* Navigation layout */
.site-nav {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--nav-width);
  height: 100vh;
  background: var(--color-paper);
  border-right: var(--rule-width) solid var(--color-rule);
  overflow-y: auto;
  padding: var(--space-8) var(--space-4);
  box-sizing: border-box;
}

.site-nav.nav-content {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.site-nav.nav-header {
  padding-bottom: var(--space-8);
  border-bottom: var(--rule-width) solid var(--color-rule);
}

.brand-title {
  font-size: clamp(1.375rem, 2.5vw, 1.625rem);
  margin: 0;
}

.site-nav.nav-menu {
  flex: 1;
  overflow-y: auto;
  padding-top: var(--space-8);
}

.menu-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu-list > li {
  margin-bottom: var(--space-2);
}

.menu-list a {
  display: block;
  text-decoration: none;
  color: var(--color-ink);
  padding: var(--space-2) var(--space-4);
  border-radius: 4px;
  transition: background-color var(--motion-standard), color var(--motion-standard);
}

.menu-list a:hover {
  background-color: var(--color-pale-number);
}

.menu-list a.active {
  background-color: var(--color-plum);
  color: white;
}

.menu-group {
  margin-top: var(--space-12);
}

.group-title {
  display: block;
  font: 600 0.75rem/1.4 var(--font-body);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-plum);
  margin-bottom: var(--space-4);
}

.sub-menu {
  list-style: none;
  margin: 0;
  padding-left: var(--space-4);
}

.sub-menu li {
  margin-bottom: var(--space-2);
}

.sub-menu a {
  font-size: 0.9375rem;
  padding: var(--space-2) var(--space-4);
}

.sub-menu a:hover {
  background-color: var(--color-pale-number);
}

.sub-menu a.active {
  background-color: var(--color-plum);
  color: white;
}

.exercises-submenu {
  padding-left: var(--space-6);
}

/* Layout with navigation */
.layout-with-nav {
  min-height: 100vh;
}

.layout-with-nav > main {
  margin-left: var(--nav-width);
  width: calc(100% - var(--nav-width));
  margin-top: 0;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: var(--space-4);
  background: var(--color-plum);
  color: white;
  padding: var(--space-4) var(--space-8);
  text-decoration: none;
  border-radius: 4px;
}

.skip-link:focus {
  top: var(--space-4);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .site-nav {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: var(--rule-width) solid var(--color-rule);
  }
  
  .nav-content {
    height: auto;
  }
  
  .layout-with-nav > main {
    margin-left: 0;
    width: 100%;
  }
  
  body.layout-with-nav {
    margin: 0;
  }
}

@media (max-width: 599px) {
  body {
    font-size: 17px;
    line-height: 1.62;
  }

  .exercise-prompt {
    font-size: 1.375rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}