/* ================================================================
   Formula Ink — Ghost theme for blog.formulacommons.com
   Tokens mirror formula-site/style.css (Commons is canonical)
   ================================================================ */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
::selection { background: rgba(108,255,177,.28); }
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }

:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --cardb: #e3e7ec;
  --tx: #3a4250;
  --mut: #5f6773;
  --faint: #9aa3b2;
  --hd: #11141c;
  --ac: #0e9e63;
  --mint: #6cffb1;
  --tint: #eef7f1;
  --header-bg: rgba(246,248,251,.85);
  --shadow: 0 8px 30px rgba(0,0,0,.12);
  --dot-color: rgba(40,70,130,.12);
}

[data-theme="dark"] {
  --bg: #11141c;
  --card: #181c26;
  --cardb: #2b313d;
  --tx: #c4ccd8;
  --mut: #8a93a3;
  --faint: #5b6473;
  --hd: #f1f4f8;
  --ac: #6cffb1;
  --tint: #1a1f2a;
  --header-bg: rgba(17,20,28,.55);
  --shadow: 0 8px 30px rgba(0,0,0,.4);
  --dot-color: rgba(150,165,195,.12);
}

body {
  font-family: 'Archivo', sans-serif;
  color: var(--tx);
  line-height: 1.5;
  letter-spacing: .02em;
  background: var(--bg);
  background-image:
    linear-gradient(to bottom, transparent 0px, transparent 110px, var(--bg) 200px),
    radial-gradient(var(--dot-color) 1.1px, transparent 1.3px);
  background-size: 100% 100%, 12px 12px;
  background-repeat: no-repeat, repeat;
}

.mono, .fc-eyebrow, .fc-crumb, .fc-section-label { font-family: 'Spline Sans Mono', monospace; }

/* --- Header --- */
.fc-header {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px;
  border-bottom: 1px solid var(--cardb);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.fc-header-brand { display: flex; align-items: center; gap: 12px; }
.fc-logo { display: flex; align-items: center; gap: 9px; }
.fc-logo-mark { font: 700 13px/1 'Spline Sans Mono', monospace; color: var(--ac); }
.fc-logo-text { font: 600 13px/1 'Spline Sans Mono', monospace; color: var(--hd); }
.fc-tagline {
  font: 400 11px/1 'Spline Sans Mono', monospace; letter-spacing: .02em;
  color: var(--faint); border-left: 1px solid var(--cardb); padding-left: 12px;
}
.fc-nav { display: flex; gap: 24px; align-items: center; }
.fc-nav a {
  font: 500 12px/1 'Spline Sans Mono', monospace; letter-spacing: .02em;
  color: var(--mut); transition: color .15s ease;
  position: relative;
}
.fc-nav a:hover { color: var(--hd); }
.fc-nav a.is-active { font-weight: 600; color: var(--hd); }
/* underline as an absolute element so it never shifts the text baseline */
.fc-nav a.is-active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -7px;
  height: 2px; background: var(--ac);
}
.fc-header-actions { display: flex; align-items: center; gap: 14px; }

/* --- Search (opens Ghost's built-in Sodo search) --- */
.fc-search {
  display: flex; align-items: center; gap: 8px;
  font: 500 12px/1 'Spline Sans Mono', monospace; letter-spacing: .02em;
  color: var(--faint);
  border: 1px solid var(--cardb); border-radius: 6px;
  background: var(--card); padding: 7px 10px;
  transition: color .15s ease, border-color .15s ease;
}
.fc-search:hover { color: var(--mut); border-color: var(--faint); }
.fc-search-icon { font-size: 13px; }
.fc-search-kbd {
  font-size: 10px; border: 1px solid var(--cardb); border-radius: 4px;
  padding: 2px 5px; color: var(--faint);
}
@media (max-width: 640px) {
  .fc-search-label, .fc-search-kbd { display: none; }
}

/* --- Buttons --- */
.fc-btn {
  font: 600 12px/1 'Spline Sans Mono', monospace; letter-spacing: .02em;
  background: var(--hd); color: var(--bg);
  padding: 12px 20px; border-radius: 6px;
  transition: opacity .15s ease;
}
.fc-btn:hover { opacity: .85; }
[data-theme="dark"] .fc-btn { background: var(--mint); color: #11141c; }
.fc-btn-sm { padding: 8px 14px; }
.fc-btn-full { width: 100%; }

/* --- Theme toggle --- */
.fc-theme-toggle {
  width: 30px; height: 16px; border-radius: 8px;
  background: #dfe3e9; position: relative; padding: 0;
}
[data-theme="dark"] .fc-theme-toggle { background: #222734; }
.fc-toggle-knob {
  position: absolute; top: 2px; left: 2px; width: 12px; height: 12px;
  border-radius: 50%; background: #fff; box-shadow: 0 1px 2px rgba(0,0,0,.2);
  transition: left .15s ease;
}
[data-theme="dark"] .fc-toggle-knob { left: 16px; background: var(--ac); box-shadow: 0 0 6px var(--ac); }

/* --- Crumb --- */
.fc-crumb {
  max-width: 1120px; margin: 0 auto; padding: 26px 28px;
  display: flex; align-items: center;
  font: 500 11px/1 'Spline Sans Mono', monospace; letter-spacing: .04em;
  color: var(--faint);
}
.fc-crumb a { color: inherit; transition: color .15s ease; }
.fc-crumb a:hover { color: var(--ac); }

/* --- Layout --- */
.fc-main { max-width: 1120px; margin: 0 auto; padding: 0 28px; }
.fc-hero { padding: 20px 0 10px; }
.fc-eyebrow {
  font: 600 11px/1 'Spline Sans Mono', monospace; letter-spacing: .08em;
  color: var(--ac); margin: 0 0 14px;
}
.fc-hero-title {
  font: 800 36px/1.1 'Archivo', sans-serif; color: var(--hd);
  margin: 0 0 14px; max-width: 680px; letter-spacing: .01em;
}
.fc-hero-sub {
  font: 400 17px/1.6 'Archivo', sans-serif; letter-spacing: .02em;
  color: var(--tx); margin: 0; max-width: 560px;
}
.fc-columns {
  display: grid; grid-template-columns: 1fr 300px; gap: 28px;
  align-items: start; padding: 34px 0 8px;
}
.fc-section-label {
  font: 600 10px/1 'Spline Sans Mono', monospace; letter-spacing: .1em;
  color: var(--faint); margin: 0 0 6px;
}

/* --- Ledger rows --- */
.fc-row {
  display: grid; grid-template-columns: 100px 1fr; gap: 18px;
  border-top: 1px solid var(--cardb); padding: 17px 2px;
  transition: border-color .2s ease;
}
.fc-row:hover { border-top-color: var(--ac); }
.fc-ledger > .fc-row:last-of-type { border-bottom: 1px solid var(--cardb); }
.fc-row-date {
  font: 500 11px/1.6 'Spline Sans Mono', monospace; letter-spacing: .04em;
  color: var(--faint); text-transform: uppercase;
}
.fc-row-kicker {
  display: block;
  font: 600 10px/1 'Spline Sans Mono', monospace; letter-spacing: .06em;
  color: var(--ac); margin: 0 0 9px; text-transform: uppercase;
}
.fc-row-title { display: block; color: var(--hd); }
.fc-row-title-daily { font: 600 17px/1.25 'Archivo', sans-serif; letter-spacing: .015em; }
.fc-row-title-weekly { font: 700 22px/1.2 'Archivo', sans-serif; letter-spacing: .01em; margin: 0 0 7px; }
.fc-row-excerpt {
  display: block;
  font: 400 13px/1.5 'Archivo', sans-serif; letter-spacing: .02em;
  color: var(--mut); margin: 6px 0 0;
}
.fc-row-excerpt-weekly { font-size: 13px; max-width: 440px; margin: 0; }
.fc-row-feature { grid-template-columns: 100px 1fr 150px; padding: 20px 2px; }
.fc-row-thumb img {
  width: 150px; height: 94px; object-fit: cover; border-radius: 4px;
}
.fc-older {
  display: block; text-align: center;
  font: 500 11px/1 'Spline Sans Mono', monospace; letter-spacing: .04em;
  color: var(--faint); margin: 20px 0 0; transition: color .15s ease;
}
.fc-older:hover { color: var(--ac); }

/* --- Rail --- */
/* padding-top matches the LATEST label block (10px line + 6px margin) so the
   rail's first border sits level with the ledger's first row border */
.fc-rail { padding-top: 16px; }
.fc-rail-block { border-top: 1px solid var(--cardb); padding: 16px 2px 22px; }
.fc-rail-eyebrow {
  font: 500 11px/1 'Spline Sans Mono', monospace; letter-spacing: .04em;
  color: var(--ac); margin: 0 0 12px;
}
.fc-rail-label {
  font: 600 10px/1 'Spline Sans Mono', monospace; letter-spacing: .1em;
  color: var(--faint); margin: 0 0 14px;
}
.fc-rail-text {
  font: 400 13px/1.55 'Archivo', sans-serif; letter-spacing: .02em;
  color: var(--mut); margin: 0 0 14px;
}
.fc-rail-subscribe { display: flex; flex-direction: column; gap: 10px; }
.fc-rail-fine {
  font: 400 11px/1.5 'Archivo', sans-serif; letter-spacing: .02em;
  color: var(--faint); margin: 0;
}
.fc-rail-tags { display: flex; flex-direction: column; gap: 11px; }
.fc-rail-tag {
  font: 500 12px/1 'Spline Sans Mono', monospace; letter-spacing: .02em;
  color: var(--tx); display: flex; justify-content: space-between;
  transition: color .15s ease;
}
.fc-rail-tag:hover { color: var(--ac); }
.fc-rail-count { color: var(--faint); }
.fc-textlink {
  font: 500 12px/1 'Spline Sans Mono', monospace; letter-spacing: .02em;
  color: var(--ac); transition: opacity .15s ease;
}
.fc-textlink:hover { opacity: .8; }

/* --- Post page --- */
.fc-post-banner { padding: 0; }
.fc-post-banner img { width: 100%; border-radius: 4px; }
.fc-rubric-strip {
  max-width: 680px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: baseline;
  border-top: 1px solid var(--cardb); border-bottom: 1px solid var(--cardb);
  padding: 20px 2px;
}
.fc-rubric-kicker {
  font: 600 14px/1 'Spline Sans Mono', monospace; letter-spacing: .08em;
  color: var(--ac);
}
.fc-rubric-sub {
  font: 500 12px/1 'Spline Sans Mono', monospace; letter-spacing: .04em;
  color: var(--faint);
}
.fc-article { max-width: 680px; margin: 0 auto; padding: 38px 0 0; }
.fc-post-meta { display: flex; gap: 16px; align-items: baseline; margin: 0 0 16px; flex-wrap: wrap; }
.fc-post-rubric {
  font: 600 11px/1 'Spline Sans Mono', monospace; letter-spacing: .06em;
  color: var(--ac); text-transform: uppercase;
}
.fc-post-date, .fc-post-read {
  font: 500 11px/1 'Spline Sans Mono', monospace; letter-spacing: .04em;
  color: var(--faint); text-transform: uppercase;
}
.fc-post-title {
  font: 800 34px/1.1 'Archivo', sans-serif; color: var(--hd);
  margin: 0 0 14px; letter-spacing: .01em;
}
.fc-post-byline {
  font: 500 11px/1 'Spline Sans Mono', monospace; letter-spacing: .04em;
  color: var(--faint); margin: 0 0 30px; text-transform: lowercase;
}
.fc-post-nav {
  border-top: 1px solid var(--cardb); border-bottom: 1px solid var(--cardb);
  padding: 18px 2px; display: flex; justify-content: space-between;
  align-items: center; gap: 16px; margin-top: 26px;
}

/* --- Post content (Koenig) --- */
.fc-content { font: 400 16px/1.65 'Archivo', sans-serif; letter-spacing: .02em; color: var(--tx); }
.fc-content > * + * { margin-top: 1.2em; }
.fc-content h2 { font: 700 24px/1.25 'Archivo', sans-serif; color: var(--hd); letter-spacing: .01em; margin-top: 1.6em; }
.fc-content h3 { font: 600 18px/1.3 'Archivo', sans-serif; color: var(--hd); letter-spacing: .015em; margin-top: 1.5em; }
.fc-content h3 a, .fc-content a { color: var(--ac); }
.fc-content a:hover { opacity: .8; }
.fc-content h3 + p { margin-top: .5em; }
.fc-content blockquote {
  margin: 1.2em 0; padding: 4px 0 4px 20px;
  border-left: 2px solid var(--ac); color: var(--mut); font-style: italic;
}
.fc-content code {
  font-family: 'Spline Sans Mono', monospace; font-size: .88em;
  background: var(--tint); color: var(--ac);
  padding: 2px 6px; border-radius: 4px;
}
.fc-content pre {
  background: #0b1a3d; color: #9fe9c4; border-radius: 6px;
  padding: 18px 20px; overflow-x: auto;
}
[data-theme="dark"] .fc-content pre { background: #020a1f; }
.fc-content pre code { background: none; color: inherit; padding: 0; }
.fc-content hr { border: none; border-top: 1px solid var(--cardb); margin: 2em 0; }
.fc-content ul, .fc-content ol { padding-left: 1.3em; }
.fc-content li + li { margin-top: .4em; }
.fc-content img { border-radius: 4px; }
.fc-content figcaption {
  font: 400 12px/1.5 'Archivo', sans-serif; color: var(--faint);
  text-align: center; margin-top: 8px;
}
.kg-card { margin: 1.4em 0; }
.kg-width-wide { margin-left: -100px; margin-right: -100px; }
.kg-width-full {
  position: relative; width: 100vw;
  left: 50%; transform: translateX(-50%);
}

/* --- Subscribe band --- */
.fc-band {
  background: var(--card); border: 1px solid var(--cardb); border-radius: 8px;
  box-shadow: var(--shadow);
  text-align: center; padding: 44px 28px; margin: 44px 0 40px;
}
.fc-band-title { font: 800 28px/1.15 'Archivo', sans-serif; color: var(--hd); margin: 0 0 10px; }
.fc-band-desc {
  font: 400 15px/1.6 'Archivo', sans-serif; letter-spacing: .02em;
  color: var(--mut); margin: 0 0 22px;
}

/* --- Subscribe modal (custom, replaces Portal signup) --- */
.fc-modal-overlay[hidden] { display: none; }
.fc-modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,.55);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.fc-modal {
  position: relative;
  width: 100%; max-width: 440px;
  background: var(--card); border: 1px solid var(--cardb);
  border-radius: 8px; box-shadow: var(--shadow);
  padding: 36px 32px 28px;
}
.fc-modal-close {
  position: absolute; top: 14px; right: 18px;
  font: 400 22px/1 'Archivo', sans-serif; color: var(--faint);
  padding: 4px;
}
.fc-modal-close:hover { color: var(--hd); }
.fc-modal-title {
  font: 800 26px/1.15 'Archivo', sans-serif; color: var(--hd);
  margin: 0 0 8px; letter-spacing: .01em;
}
.fc-modal-desc {
  font: 400 14px/1.55 'Archivo', sans-serif; letter-spacing: .02em;
  color: var(--mut); margin: 0 0 22px;
}
.fc-modal-form { display: flex; flex-direction: column; gap: 14px; }
.fc-field { display: flex; flex-direction: column; gap: 7px; }
.fc-field-label {
  font: 600 10px/1 'Spline Sans Mono', monospace; letter-spacing: .1em;
  color: var(--faint);
}
.fc-field input {
  font: 400 14px/1.4 'Archivo', sans-serif; letter-spacing: .02em;
  color: var(--hd); background: var(--bg);
  border: 1px solid var(--cardb); border-radius: 6px;
  padding: 11px 13px; outline: none;
  transition: border-color .15s ease;
}
.fc-field input:focus { border-color: var(--ac); }
.fc-field input::placeholder { color: var(--faint); }
.fc-modal-success {
  font: 500 14px/1.55 'Archivo', sans-serif; letter-spacing: .02em;
  color: var(--ac); margin: 8px 0 0;
}
.fc-modal-fine {
  font: 500 11px/1 'Spline Sans Mono', monospace; letter-spacing: .02em;
  color: var(--faint); margin: 18px 0 0; text-align: center;
}
.fc-modal-fine a { color: var(--ac); font-weight: 600; }

/* --- Footer --- */
.fc-footer { max-width: 1120px; margin: 0 auto; padding: 0 28px 28px; }
.fc-footer-inner {
  border-top: 1px solid var(--cardb); padding: 24px 2px 0;
  display: flex; justify-content: space-between; align-items: center;
}
.fc-footer-nav { display: flex; gap: 24px; }
.fc-footer-nav a {
  font: 500 12px/1 'Spline Sans Mono', monospace; letter-spacing: .02em;
  color: var(--mut); transition: color .15s ease;
}
.fc-footer-nav a:hover { color: var(--hd); }

/* --- Responsive --- */
@media (max-width: 900px) {
  .fc-columns { grid-template-columns: 1fr; }
  .fc-rail { order: 2; }
  .fc-tagline { display: none; }
  .kg-width-wide { margin-left: 0; margin-right: 0; }
}
@media (max-width: 640px) {
  .fc-header { padding: 12px 16px; flex-wrap: wrap; gap: 10px; }
  .fc-nav { gap: 14px; }
  .fc-main, .fc-crumb, .fc-footer { padding-left: 16px; padding-right: 16px; }
  .fc-row, .fc-row-feature { grid-template-columns: 1fr; gap: 6px; }
  .fc-row-thumb img { width: 100%; height: auto; }
  .fc-hero-title { font-size: 30px; }
  .fc-post-title { font-size: 28px; }
}