/* ============================================
   Lantern & Bone — Design System
   A candlelit Victorian library, in CSS.
   ============================================ */

/* ─── CSS Custom Properties (Tokens) ─── */
:root {
  /* Palette */
  --color-bg: #1a1612;
  --color-bg-noise: #1c1814;
  --color-surface: #2a241e;
  --color-surface-raised: #352d26;
  --color-text-primary: #e8dfd1;
  --color-text-secondary: #a89c89;
  --color-text-muted: #7a6f5f;
  --color-accent: #b8995a;
  --color-accent-dim: #8a7344;
  --color-border: #3a3128;
  --color-border-subtle: #2a241e;

  /* Typography */
  --font-display: 'Cormorant Garamond', 'EB Garamond', 'Georgia', serif;
  --font-body: 'Source Serif 4', 'Newsreader', 'Georgia', serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Type Scale */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1.125rem;   /* 18px */
  --text-lg: 1.25rem;      /* 20px */
  --text-xl: 1.5rem;       /* 24px */
  --text-2xl: 2rem;        /* 32px */
  --text-3xl: 2.5rem;      /* 40px */
  --text-4xl: 3.5rem;      /* 56px */
  --text-5xl: 5rem;        /* 80px */
  --text-6xl: 6rem;        /* 96px */

  /* Line Height */
  --leading-tight: 1.2;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Motion */
  --transition-fast: 200ms ease;
  --transition-base: 400ms ease;
  --transition-slow: 800ms ease;
  --transition-image: 1200ms ease;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 720px;
  --max-width-wide: 1400px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── Grain Overlay ─── */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* ─── Typography ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
  margin-bottom: var(--space-6);
  max-width: 70ch;
}

p:last-child {
  margin-bottom: 0;
}

/* Small caps */
.small-caps {
  font-variant: small-caps;
  letter-spacing: 0.08em;
  text-transform: lowercase;
}

/* Italic emphasis */
em, i {
  font-style: italic;
}

/* Monospace for metadata */
.mono {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

/* ─── Links ─── */
a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Hairline underline on hover for text links */
a.underlined {
  position: relative;
}

a.underlined::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

a.underlined:hover::after {
  width: 100%;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-variant: small-caps;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--color-text-primary);
  background-color: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-dim);
  border-color: var(--color-accent-dim);
  color: var(--color-bg);
}

/* ─── Form Elements ─── */
input, textarea {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  width: 100%;
  transition: border-color var(--transition-fast);
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

input::placeholder, textarea::placeholder {
  color: var(--color-text-muted);
}

/* ─── Layout Utilities ─── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-wide {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-24) 0;
}

.section-sm {
  padding: var(--space-16) 0;
}

/* ─── Image Treatment ─── */
.image-archive {
  position: relative;
  overflow: hidden;
}

.image-archive img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: sepia(15%) saturate(85%) contrast(105%);
  transition: filter var(--transition-image), transform var(--transition-image);
}

.image-archive::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    rgba(26, 22, 18, 0) 0%,
    rgba(26, 22, 18, 0.3) 100%
  );
  pointer-events: none;
}

.image-archive:hover img {
  filter: sepia(5%) saturate(95%) contrast(110%);
  transform: scale(1.02);
}

/* ─── Cards ─── */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-8);
  transition: border-color var(--transition-fast);
}

.card:hover {
  border-color: var(--color-border);
}

/* ─── Horizontal Rule ─── */
hr {
  border: none;
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-16) 0;
}

/* ─── Pull Quote ─── */
.pull-quote {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-style: italic;
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
  border-left: 1px solid var(--color-accent);
  padding-left: var(--space-6);
  margin: var(--space-12) 0;
}

.pull-quote cite {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-style: normal;
  font-variant: small-caps;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--color-text-muted);
  margin-top: var(--space-4);
}

/* ─── Skip Link ─── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 10000;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-accent);
  color: var(--color-bg);
  font-variant: small-caps;
  letter-spacing: 0.08em;
}

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

/* ─── Focus States ─── */
:focus-visible {
  outline: 1px solid var(--color-accent);
  outline-offset: 2px;
}

/* ─── Reduced Motion ─── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ─── Print Styles ─── */
@media print {
  body {
    background: white;
    color: black;
  }

  body::before {
    display: none;
  }
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  :root {
    --text-base: 1.0625rem;  /* 17px */
    --text-5xl: 3rem;        /* 48px */
    --text-3xl: 1.75rem;     /* 28px */
  }

  .section {
    padding: var(--space-16) 0;
  }

  .container, .container-narrow, .container-wide {
    padding: 0 var(--space-4);
  }
}