/* ============================================
   casad.io — Site Stylesheet
   ============================================ */

/* --- Custom Properties --- */
:root {
  --color-bg: #121210;
  --color-bg-alt: #1a1a17;
  --color-bg-card: #1e1e1b;
  --color-text: #c8c4b8;
  --color-text-muted: #8a867a;
  --color-text-bright: #e8e4d8;
  --color-accent: #a69070;
  --color-accent-dim: #7a6a52;
  --color-rule: #2a2a25;
  --color-rule-light: #333330;

  --font-display: 'Cormorant Garamond', 'Georgia', serif;
  --font-body: 'Source Serif 4', 'Georgia', serif;
  --font-nav: 'Alegreya Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max-width-text: 38rem;
  --max-width-page: 52rem;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
}

/* --- Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.72;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Typography --- */

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--color-text-bright);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

h1 {
  font-size: 2.6rem;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 1.7rem;
  margin-bottom: var(--spacing-sm);
}

h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

p {
  margin-bottom: 1.4rem;
}

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

a:hover {
  color: var(--color-text-bright);
}

blockquote {
  border-left: 2px solid var(--color-accent-dim);
  padding-left: var(--spacing-sm);
  margin: var(--spacing-md) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

/* --- Layout --- */

.site-container {
  max-width: var(--max-width-page);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.text-column {
  max-width: var(--max-width-text);
}

/* --- Site Header --- */

.site-header {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-rule);
}

.site-header-inner {
  max-width: var(--max-width-page);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.site-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--color-text-bright);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-title a {
  color: inherit;
}

.site-title a:hover {
  color: var(--color-accent);
}

/* --- Navigation --- */

.site-nav {
  font-family: var(--font-nav);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-nav a {
  color: var(--color-text-muted);
  margin-left: var(--spacing-md);
  transition: color 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text-bright);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
}

/* --- Landing Page --- */

.landing-hero {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-bottom: 1px solid var(--color-rule);
}

.landing-hero h1 {
  font-size: 3.2rem;
  letter-spacing: 0.02em;
  margin-bottom: var(--spacing-xs);
}

.landing-hero .subtitle {
  font-family: var(--font-nav);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

.landing-description {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-rule);
}

.landing-description p {
  font-size: 1.05rem;
  max-width: var(--max-width-text);
}

/* --- Chapter Index --- */

.chapter-index {
  padding: var(--spacing-lg) 0;
}

.chapter-index h2 {
  font-size: 1.1rem;
  font-family: var(--font-nav);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  font-weight: 400;
}

.chapter-list {
  list-style: none;
}

.chapter-list li {
  border-bottom: 1px solid var(--color-rule);
}

.chapter-list li:first-child {
  border-top: 1px solid var(--color-rule);
}

.chapter-list a {
  display: flex;
  align-items: baseline;
  padding: 1rem 0;
  transition: background-color 0.15s ease;
  gap: 1.2rem;
}

.chapter-list a:hover {
  color: var(--color-text-bright);
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent-dim);
  min-width: 2rem;
  flex-shrink: 0;
}

.chapter-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--color-text);
  flex-grow: 1;
}

.chapter-list a:hover .chapter-title {
  color: var(--color-text-bright);
}

.chapter-field {
  font-family: var(--font-nav);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

/* --- Chapter Page --- */

.chapter-header {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-bottom: 1px solid var(--color-rule);
}

.chapter-header .chapter-label {
  font-family: var(--font-nav);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.chapter-header h1 {
  font-size: 2.4rem;
  margin-bottom: var(--spacing-xs);
}

.chapter-header .chapter-field-label {
  font-family: var(--font-nav);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-dim);
}

.chapter-body {
  padding: var(--spacing-lg) 0;
  max-width: var(--max-width-text);
}

.chapter-body p {
  text-indent: 1.5rem;
  margin-bottom: 1.2rem;
}

.chapter-body p:first-child {
  text-indent: 0;
}

.chapter-body .placeholder {
  color: var(--color-text-muted);
  font-style: italic;
  text-indent: 0;
  padding: var(--spacing-md) 0;
}

/* Chapter navigation */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-md) 0 var(--spacing-lg);
  border-top: 1px solid var(--color-rule);
  font-family: var(--font-nav);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.chapter-nav a {
  color: var(--color-text-muted);
}

.chapter-nav a:hover {
  color: var(--color-text-bright);
}

.chapter-nav .prev::before {
  content: '\2190\00a0';
}

.chapter-nav .next::after {
  content: '\00a0\2192';
}

/* --- Full Text Page --- */

.full-text-header {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-bottom: 1px solid var(--color-rule);
}

.full-text-body {
  padding: var(--spacing-lg) 0;
  max-width: var(--max-width-text);
}

.full-text-body h2 {
  font-size: 1.5rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-rule);
}

.full-text-body h2:first-child {
  margin-top: 0;
  border-top: none;
  padding-top: 0;
}

.full-text-body p {
  text-indent: 1.5rem;
  margin-bottom: 1.2rem;
}

/* --- About Page --- */

.about-header {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-bottom: 1px solid var(--color-rule);
}

.about-body {
  padding: var(--spacing-lg) 0;
  max-width: var(--max-width-text);
}

.about-body p {
  margin-bottom: 1.4rem;
}

/* --- Second Book Placeholder --- */

.placeholder-page {
  padding: var(--spacing-xl) 0;
}

.placeholder-page h1 {
  margin-bottom: var(--spacing-md);
}

.placeholder-page p {
  max-width: var(--max-width-text);
  color: var(--color-text-muted);
}

/* --- Site Footer --- */

.site-footer {
  padding: var(--spacing-md) 0;
  border-top: 1px solid var(--color-rule);
  margin-top: var(--spacing-lg);
}

.site-footer-inner {
  max-width: var(--max-width-page);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  font-family: var(--font-nav);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

/* --- Responsive --- */

@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  .site-header-inner {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    display: none;
    width: 100%;
    padding-top: var(--spacing-sm);
  }

  .site-nav.open {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .site-nav a {
    margin-left: 0;
    padding: 0.4rem 0;
  }

  .landing-hero h1 {
    font-size: 2.2rem;
  }

  h1 {
    font-size: 2rem;
  }

  .chapter-list a {
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .chapter-field {
    width: 100%;
    order: 3;
  }

  .site-container {
    padding: 0 var(--spacing-sm);
  }

  .site-header-inner {
    padding: 0 var(--spacing-sm);
  }

  .site-footer-inner {
    padding: 0 var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .landing-hero {
    padding: var(--spacing-lg) 0 var(--spacing-md);
  }

  .chapter-header {
    padding: var(--spacing-lg) 0 var(--spacing-md);
  }
}

/* --- Utility --- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}