/* =========================================================================
   Nick Karnik — design tokens & base styles
   Letterpress for the internet
   ========================================================================= */

:root {
  /* ENGINEERING MODE — dark, mono-first, terminal-grade (default) */
  --paper:    oklch(0.16 0.008 250);
  --paper-2:  oklch(0.205 0.010 250);
  --paper-3:  oklch(0.245 0.012 250);
  --ink:      oklch(0.965 0.008 250);
  --ink-2:    oklch(0.78 0.012 250);
  --ink-3:    oklch(0.55 0.014 250);
  --rule:     oklch(0.28 0.012 250);
  --rule-2:   oklch(0.22 0.010 250);

  /* accent — terminal green */
  --accent:    oklch(0.82 0.18 145);
  --accent-2:  oklch(0.72 0.18 145);
  --accent-pale: oklch(0.28 0.08 145);

  /* secondary accents (for tokens / syntax-colored ui) */
  --tok-key:   oklch(0.78 0.15 200);   /* cyan */
  --tok-str:   oklch(0.80 0.14 60);    /* amber */
  --tok-num:   oklch(0.78 0.16 320);   /* magenta */

  /* type */
  --serif:  "Newsreader", "Source Serif 4", Georgia, serif;
  --mono:   "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --ui:     "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --sans:   "JetBrains Mono", ui-monospace, monospace;

  /* spacing scale (airy default) */
  --gap-1: 0.5rem;
  --gap-2: 1rem;
  --gap-3: 1.5rem;
  --gap-4: 2.5rem;
  --gap-5: 4rem;
  --gap-6: 6rem;
  --gap-7: 9rem;

  /* widths */
  --col-prose: 36rem;
  --col-wide: 64rem;
  --col-page: 78rem;

  /* type scale */
  --display: 5.5rem;
  --h1: 3.25rem;
  --h2: 2.25rem;
  --h3: 1.5rem;
  --h4: 1.125rem;
  --body: 1.0625rem;
  --small: 0.875rem;
  --mono-sm: 0.75rem;
}

/* density: compact override */
[data-density="compact"] {
  --gap-4: 1.75rem;
  --gap-5: 2.75rem;
  --gap-6: 4rem;
  --gap-7: 6rem;
  --display: 4.25rem;
  --h1: 2.5rem;
  --h2: 1.875rem;
  --body: 1rem;
}

/* EDITORIAL MODE — warm cream paper, oxblood accent */
[data-aesthetic="editorial"] {
  --paper:    oklch(0.965 0.012 80);
  --paper-2:  oklch(0.945 0.014 78);
  --paper-3:  oklch(0.915 0.016 75);
  --ink:      oklch(0.22 0.018 60);
  --ink-2:    oklch(0.42 0.015 60);
  --ink-3:    oklch(0.58 0.012 65);
  --rule:     oklch(0.86 0.012 70);
  --rule-2:   oklch(0.92 0.010 70);
  --accent:    oklch(0.48 0.13 28);
  --accent-pale: oklch(0.92 0.04 28);
  --serif:  "Newsreader", "Source Serif 4", Georgia, serif;
  --ui:     "Newsreader", Georgia, serif;
}

/* Engineering mode + light theme — paper bg, ink fg, mono-first */
[data-aesthetic="engineering"][data-theme="light"] {
  --paper:    oklch(0.985 0.003 250);
  --paper-2:  oklch(0.96 0.004 250);
  --paper-3:  oklch(0.93 0.005 250);
  --ink:      oklch(0.18 0.012 250);
  --ink-2:    oklch(0.38 0.012 250);
  --ink-3:    oklch(0.58 0.012 250);
  --rule:     oklch(0.88 0.005 250);
  --rule-2:   oklch(0.94 0.004 250);
  --accent:   oklch(0.55 0.16 145);
  --accent-pale: oklch(0.93 0.05 145);
}

/* Editorial + dark theme */
[data-aesthetic="editorial"][data-theme="dark"] {
  --paper:    oklch(0.165 0.012 60);
  --paper-2:  oklch(0.205 0.014 60);
  --paper-3:  oklch(0.245 0.014 60);
  --ink:      oklch(0.95 0.008 85);
  --ink-2:    oklch(0.78 0.010 80);
  --ink-3:    oklch(0.58 0.012 65);
  --rule:     oklch(0.30 0.014 65);
  --accent-pale: oklch(0.30 0.06 28);
}

/* type pairing variants */
[data-typeface="editorial"] {
  --serif: "Newsreader", Georgia, serif;
  --mono:  "JetBrains Mono", ui-monospace, monospace;
}
[data-typeface="classical"] {
  --serif: "EB Garamond", "Source Serif 4", Georgia, serif;
  --mono:  "IBM Plex Mono", ui-monospace, monospace;
}
[data-typeface="modernist"] {
  --serif: "Instrument Serif", "Source Serif 4", Georgia, serif;
  --mono:  "JetBrains Mono", ui-monospace, monospace;
}
[data-typeface="scholarly"] {
  --serif: "Source Serif 4", "Newsreader", Georgia, serif;
  --mono:  "IBM Plex Mono", ui-monospace, monospace;
}

/* base */
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ui);
  font-size: var(--body);
  line-height: 1.6;
  font-feature-settings: "kern", "calt";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[data-aesthetic="editorial"] body { font-family: var(--serif); font-feature-settings: "ss01","onum","kern"; }

::selection { background: var(--accent); color: var(--paper); }

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: border-color 140ms ease, color 140ms ease;
}
a:hover { border-bottom-color: var(--accent); color: var(--accent); }

a.plain, a.nav-link { border-bottom: none; }

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

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: var(--gap-4) 0;
}

/* =========================================================================
   typography classes
   ========================================================================= */

.display {
  font-family: var(--ui);
  font-size: var(--display);
  line-height: 0.95;
  letter-spacing: -0.035em;
  font-weight: 500;
}
[data-aesthetic="editorial"] .display { font-family: var(--serif); font-weight: 400; letter-spacing: -0.025em; }

.h1 {
  font-family: var(--ui);
  font-size: var(--h1);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 500;
}
[data-aesthetic="editorial"] .h1 { font-family: var(--serif); font-weight: 400; letter-spacing: -0.02em; }

.h2 {
  font-family: var(--ui);
  font-size: var(--h2);
  line-height: 1.1;
  letter-spacing: -0.025em;
  font-weight: 500;
}
[data-aesthetic="editorial"] .h2 { font-family: var(--serif); }

.h3 {
  font-family: var(--ui);
  font-size: var(--h3);
  line-height: 1.25;
  letter-spacing: -0.015em;
  font-weight: 500;
}
[data-aesthetic="editorial"] .h3 { font-family: var(--serif); letter-spacing: 0; }

.eyebrow {
  font-family: var(--mono);
  font-size: var(--mono-sm);
  letter-spacing: 0.04em;
  color: var(--ink-3);
  font-weight: 500;
}
[data-aesthetic="editorial"] .eyebrow { text-transform: uppercase; letter-spacing: 0.18em; }
.eyebrow .num {
  color: var(--accent);
  margin-right: 0.6em;
}
.eyebrow::before {
  content: "// ";
  color: var(--ink-3);
  opacity: 0.6;
}
[data-aesthetic="editorial"] .eyebrow::before { content: none; }

.dateline {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  text-transform: uppercase;
}

.mono {
  font-family: var(--mono);
  font-size: var(--mono-sm);
  letter-spacing: 0.04em;
}

.small-caps {
  font-variant-caps: all-small-caps;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.lede {
  font-family: var(--ui);
  font-size: 1.125rem;
  line-height: 1.55;
  color: var(--ink-2);
  letter-spacing: -0.005em;
}
[data-aesthetic="editorial"] .lede { font-family: var(--serif); font-size: 1.375rem; font-style: italic; line-height: 1.45; }

.italic { font-style: italic; }

.prose {
  max-width: var(--col-prose);
  font-size: 1.125rem;
  line-height: 1.65;
}
.prose p { margin: 0 0 1.25em; }
.prose p:first-of-type::first-letter {
  font-size: 3.5em;
  float: left;
  line-height: 0.85;
  padding: 0.05em 0.08em 0 0;
  color: var(--accent);
  font-style: italic;
}
[data-aesthetic="engineering"] .prose p:first-of-type::first-letter { all: unset; }
[data-aesthetic="engineering"] .prose { font-family: "Source Serif 4", "Newsreader", Georgia, serif; }
.prose h2 {
  font-size: 1.625rem;
  margin: 2.25em 0 0.5em;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.prose h3 {
  font-size: 1.125rem;
  margin: 1.75em 0 0.25em;
  font-weight: 600;
}
.prose blockquote {
  border-left: 2px solid var(--accent);
  padding: 0.25em 0 0.25em 1.5em;
  margin: 1.75em 0;
  font-style: italic;
  color: var(--ink-2);
}
.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--paper-2);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

/* =========================================================================
   layout
   ========================================================================= */

.page {
  max-width: var(--col-page);
  margin: 0 auto;
  padding: 0 var(--gap-4);
}

.rule { border-top: 1px solid var(--rule); }
.rule-thick { border-top: 2px solid var(--ink); }
.rule-accent { border-top: 1px solid var(--accent); }

.section-tag {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: var(--gap-3);
  padding-top: 0.75rem;
  border-top: 1px solid var(--ink);
}
.section-tag .num {
  font-family: var(--mono);
  font-size: var(--mono-sm);
  letter-spacing: 0.04em;
  color: var(--accent);
}
.section-tag .num::before {
  content: "~/";
  color: var(--ink-3);
  opacity: 0.5;
  margin-right: 0.15em;
}
[data-aesthetic="editorial"] .section-tag .num::before { content: "\00a7\00a0"; opacity: 1; color: var(--accent); }
.section-tag .label {
  font-family: var(--mono);
  font-size: var(--mono-sm);
  letter-spacing: 0.04em;
  color: var(--ink-2);
}
[data-aesthetic="editorial"] .section-tag .label { text-transform: uppercase; letter-spacing: 0.18em; }
.section-tag .right {
  margin-left: auto;
  font-family: var(--mono);
  font-size: var(--mono-sm);
  color: var(--ink-3);
}

/* marginalia — annotations in the margin */
.with-margin {
  display: grid;
  grid-template-columns: 1fr 12rem;
  gap: var(--gap-4);
  align-items: start;
}
.with-margin .margin-note {
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  padding-top: 0.5rem;
  border-top: 1px solid var(--rule);
}
@media (max-width: 880px) {
  .with-margin { grid-template-columns: 1fr; }
  .with-margin .margin-note { padding-top: 0.25rem; }
}

/* placeholder image — subtle stripes */
.img-slot {
  position: relative;
  background:
    repeating-linear-gradient(
      135deg,
      var(--paper-2) 0 8px,
      var(--paper-3) 8px 16px
    );
  border: 1px solid var(--rule);
  color: var(--ink-3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  overflow: hidden;
}
[data-aesthetic="editorial"] .img-slot { text-transform: uppercase; letter-spacing: 0.12em; }
.img-slot::after {
  content: attr(data-label);
  background: var(--paper);
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--rule);
}
.img-slot::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, transparent calc(100% - 1px), color-mix(in oklch, var(--accent) 25%, transparent) 100%) 0 0/24px 100%,
    linear-gradient(to bottom, transparent calc(100% - 1px), color-mix(in oklch, var(--accent) 25%, transparent) 100%) 0 0/100% 24px;
  opacity: 0.4;
  pointer-events: none;
}
[data-aesthetic="editorial"] .img-slot::before { display: none; }

/* tags / chips */
.tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  padding: 0.3em 0.6em;
  border: 1px solid var(--rule);
  border-radius: 1px;
  display: inline-block;
}
[data-aesthetic="editorial"] .tag { text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.7rem; }
.tag.accent { color: var(--accent); border-color: var(--accent); }

/* buttons */
.btn {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  padding: 0.7em 1.1em;
  background: var(--ink);
  color: var(--paper);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  transition: background 140ms ease, color 140ms ease;
}
[data-aesthetic="editorial"] .btn { text-transform: uppercase; letter-spacing: 0.16em; font-size: 0.78rem; padding: 0.85em 1.4em; }
.btn:hover { background: var(--accent); color: var(--paper); border-bottom: none; }
[data-aesthetic="engineering"][data-theme="light"] .btn:hover { color: var(--ink); }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule);
}
.btn.ghost:hover { background: var(--paper-2); border-color: var(--accent); color: var(--accent); }
.btn::before { content: "$ "; color: currentColor; opacity: 0.6; }
[data-aesthetic="editorial"] .btn::before { content: none; }
.btn.ghost::before { content: "→ "; }

/* sup / footnote */
sup.fn {
  font-family: var(--mono);
  font-size: 0.6em;
  color: var(--accent);
  vertical-align: super;
  padding: 0 0.1em;
}

/* index list (blog/recipes) */
.index-row {
  display: grid;
  grid-template-columns: 6rem 1fr 14rem 6rem;
  gap: var(--gap-3);
  padding: var(--gap-3) 0;
  border-top: 1px solid var(--rule);
  align-items: baseline;
  transition: background 160ms ease;
}
.index-row:hover { background: var(--paper-2); }
.index-row .num {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-3);
  letter-spacing: 0.05em;
}
.index-row .title {
  font-size: 1.5rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.index-row .meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
@media (max-width: 880px) {
  .index-row { grid-template-columns: 4rem 1fr; }
  .index-row .meta, .index-row .read-time { display: none; }
}

/* nav */
.site-nav {
  display: flex;
  align-items: center;
  padding: var(--gap-3) var(--gap-4);
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  background: color-mix(in oklch, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  z-index: 50;
}
.site-nav .brand-link {
  border-bottom: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.site-nav .links {
  margin-left: auto;
  display: flex;
  gap: var(--gap-3);
  align-items: baseline;
}
.site-nav .links a {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  border-bottom: none;
  color: var(--ink-2);
  position: relative;
  padding-bottom: 0.2em;
}
[data-aesthetic="editorial"] .site-nav .links a { text-transform: uppercase; letter-spacing: 0.16em; font-size: 0.78rem; }
.site-nav .links a:hover { color: var(--ink); }
.site-nav .links a.active { color: var(--ink); }
.site-nav .links a.active::after {
  content: "";
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
}

/* footer */
.site-footer {
  margin-top: var(--gap-7);
  border-top: 2px solid var(--ink);
  padding: var(--gap-4) var(--gap-4) var(--gap-3);
}
.site-footer .row {
  max-width: var(--col-page);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--gap-4);
}
.site-footer h4 {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.01em;
  color: var(--ink-3);
  margin: 0 0 1rem;
  font-weight: 500;
}
.site-footer h4::before { content: "# "; color: var(--accent); opacity: 0.7; }
[data-aesthetic="editorial"] .site-footer h4 { text-transform: uppercase; letter-spacing: 0.18em; font-size: 0.72rem; }
[data-aesthetic="editorial"] .site-footer h4::before { content: none; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.4rem; font-size: 0.95rem; }
.site-footer .colophon {
  max-width: var(--col-page);
  margin: var(--gap-4) auto 0;
  border-top: 1px solid var(--rule);
  padding-top: var(--gap-2);
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}
@media (max-width: 720px) {
  .site-footer .row { grid-template-columns: 1fr; }
}

/* status bar (engineering mode) */
.status-bar {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  padding: 0.4rem var(--gap-4);
  border-bottom: 1px solid var(--rule);
  display: flex;
  gap: 1.5rem;
  letter-spacing: 0.01em;
  background: var(--paper-2);
}
.status-bar .dot {
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--accent);
  margin-right: 0.5em;
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
[data-aesthetic="editorial"] .status-bar { display: none; }

/* terminal-style code block */
.term {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 1rem 1.1rem;
  color: var(--ink-2);
  line-height: 1.7;
  letter-spacing: 0;
}
.term .prompt { color: var(--accent); user-select: none; }
.term .comment { color: var(--ink-3); }
.term .key { color: var(--tok-key); }
.term .str { color: var(--tok-str); }
.term .num-tok { color: var(--tok-num); }
.term .cursor {
  display: inline-block;
  width: 0.5em; height: 1em;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 1s steps(1) infinite;
  margin-left: 0.1em;
}
@keyframes blink { 50% { opacity: 0; } }

/* page transitions */
.page-fade {
  animation: fade-in 320ms ease both;
}
@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: none; }
}