/* ============================================================
   f/11 — design system
   A case study in building a photo-heavy Eleventy site with crustyimg.

   The idea in one line: the chrome stays near-monochrome and the
   photographs supply all the color. The single accent is a darkroom
   safelight amber, and it lives — almost exclusively — in the slash.
   If you're reading this file to understand the design, that restraint
   IS the design. Keep it that way.
   ============================================================ */

:root {
  color-scheme: dark;

  /* — Surfaces · warm near-black, barely-there lifts — */
  --bg:        #0e0f11;   /* the room */
  --bg-raised: #151719;   /* panels, code, the pipeline card */
  --bg-sunk:   #090a0b;   /* letterbox behind full-bleed covers */

  /* — Ink · warm off-white, never pure #fff — */
  --fg:        #e9e6df;
  --fg-muted:  #9b988f;   /* deks, captions, metadata */
  --fg-faint:  #61605a;   /* stripped fields, the least-important */

  /* — Accent · safelight amber. Aim for once per view. — */
  --accent:     #e7a54b;
  --accent-dim: #b98436;
  --accent-ink: #120c04;  /* ink on an amber fill */

  /* — Structure · hairlines, not boxes — */
  --rule:      color-mix(in oklab, var(--fg) 13%, transparent);
  --rule-soft: color-mix(in oklab, var(--fg) 6%,  transparent);

  /* — Measure & rhythm — */
  --measure: 65ch;
  --gutter:  clamp(1.1rem, 4vw, 2.75rem);
  --step:    clamp(1.4rem, 3vw, 2.2rem);

  /* — Type · tokenized. Drop real faces in later; the fallbacks hold. — */
  --serif: "Newsreader", "Iowan Old Style", Charter, Georgia, serif;
  --mono:  "Berkeley Mono", ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;

  --fs-micro:   0.75rem;
  --fs-meta:    0.8125rem;
  --fs-body:    1.0625rem;
  --fs-lead:    1.2rem;
  --fs-h2:      1.55rem;
  --fs-h1:      clamp(2rem, 5vw, 3.1rem);
  --fs-display: clamp(2.6rem, 8.5vw, 5.5rem);
}

/* ---- reset-ish -------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--serif);
  font-size: var(--fs-body);
  line-height: 1.65;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { line-height: 1.15; font-weight: 500; letter-spacing: -0.012em; }
h1 { font-size: var(--fs-h1); margin: 0 0 0.4em; }
h2 { font-size: var(--fs-h2); margin: 2em 0 0.6em; }
p  { margin: 0 0 1em; }
a  { color: inherit; text-decoration-color: var(--accent-dim); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); text-decoration-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 1px; }
hr { border: 0; border-top: 1px solid var(--rule); margin: var(--step) 0; }

/* ---- shared utilities ------------------------------------------ */
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.wrap { width: 100%; max-width: var(--measure); margin-inline: auto; padding-inline: var(--gutter); }
.eyebrow {
  font-family: var(--mono);
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  margin: 0 0 0.9em;
}
.lead { font-size: var(--fs-lead); color: var(--fg-muted); line-height: 1.5; }

/* ---- the wordmark · f/11, slash in safelight amber ------------- */
.wordmark {
  font-family: var(--mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-decoration: none;
}
.wordmark .slash { color: var(--accent); padding-inline: 0.01em; }
.wordmark:hover { color: var(--fg); }
.wordmark--hero { font-size: var(--fs-display); }

/* ---- site header · sticky, hairline base ----------------------- */
.site-head {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem var(--gutter);
  background: color-mix(in oklab, var(--bg) 86%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-head .wordmark { font-size: 1.15rem; }
.site-nav { display: flex; gap: clamp(0.8rem, 2.5vw, 1.6rem); font-size: var(--fs-meta); }
.site-nav a { color: var(--fg-muted); text-decoration: none; }
.site-nav a:hover { color: var(--fg); }
.site-nav a[aria-current="page"] { color: var(--accent); }

/* ---- site footer ----------------------------------------------- */
.site-foot {
  margin-top: calc(var(--step) * 2.5);
  padding: var(--step) var(--gutter);
  border-top: 1px solid var(--rule);
  color: var(--fg-muted);
  font-size: var(--fs-meta);
}
.site-foot p { margin: 0 0 0.4em; }

/* ============================================================
   LANDING · the front door that says "case study", not "blog"
   ============================================================ */
.hero { padding: clamp(3rem, 12vh, 7rem) var(--gutter) var(--step); max-width: 60rem; margin-inline: auto; }
.hero__thesis { font-size: var(--fs-lead); color: var(--fg); max-width: 42ch; margin-block: 1.2em; }
.hero__thesis b { color: var(--accent); font-weight: 500; }

/* the headline benchmark numbers, pulled from the live build */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 1px;
  background: var(--rule);
  border-block: 1px solid var(--rule);
  margin-top: var(--step);
}
.stat { background: var(--bg); padding: 1.1rem 1.2rem; }
.stat__num { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 1.7rem; color: var(--fg); }
.stat__num em { color: var(--accent); font-style: normal; }
.stat__label { font-family: var(--mono); font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: 0.1em; color: var(--fg-muted); margin-top: 0.35rem; }

/* ============================================================
   GUIDE HOME · a numbered spine you can read in order.
   (Numbering earns its place: the build really is a sequence.)
   ============================================================ */
.spine { list-style: none; margin: 0; padding: 0; }
.chapter {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: clamp(0.9rem, 3vw, 1.8rem);
  padding-block: 1.15rem;
  border-top: 1px solid var(--rule);
  text-decoration: none;
}
.spine > li:last-child .chapter { border-bottom: 1px solid var(--rule); }
.chapter__num { font-family: var(--mono); font-size: var(--fs-meta); color: var(--accent-dim); }
.chapter__title { font-size: 1.2rem; margin: 0 0 0.2em; }
.chapter__dek { color: var(--fg-muted); font-size: var(--fs-meta); margin: 0; }
.chapter__status { font-family: var(--mono); font-size: var(--fs-micro); color: var(--fg-faint); text-transform: uppercase; letter-spacing: 0.1em; white-space: nowrap; }
.chapter:hover .chapter__title { color: var(--accent); }

.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: var(--step); }
.tag { font-family: var(--mono); font-size: var(--fs-micro); color: var(--fg-muted); border: 1px solid var(--rule); padding: 0.25rem 0.6rem; text-decoration: none; }
.tag:hover { color: var(--accent); border-color: var(--accent-dim); }

/* ============================================================
   ARTICLE · a single measure, but with apparatus
   ============================================================ */
.article { padding-block: var(--step); }
.article__head { margin-bottom: var(--step); }
.byline { color: var(--fg-muted); font-size: var(--fs-meta); }
.article :is(p, ul, ol) { max-width: var(--measure); }
.article figure { margin: var(--step) 0; }
.article figcaption { font-family: var(--mono); font-size: var(--fs-micro); color: var(--fg-muted); margin-top: 0.5rem; }

/* code + config, kept quiet */
pre { background: var(--bg-raised); border-left: 2px solid var(--accent-dim); padding: 1rem 1.2rem; overflow-x: auto; font-size: var(--fs-meta); line-height: 1.55; margin: var(--step) 0; }
code { font-family: var(--mono); font-size: 0.92em; }
:not(pre) > code { background: var(--bg-raised); padding: 0.1em 0.35em; border-radius: 2px; }

/* the RESULT block · the measurable outcome, as evidence */
.result { font-family: var(--mono); background: var(--bg-raised); border: 1px solid var(--rule); padding: 1.1rem 1.2rem; margin: var(--step) 0; }
.result__label { font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: 0.12em; color: var(--fg-muted); margin: 0 0 0.7rem; }
.result__row { display: grid; grid-template-columns: 5.5rem 1fr auto; gap: 0.8rem; align-items: center; font-size: var(--fs-meta); margin-bottom: 0.4rem; }
.result__row span:first-child { color: var(--fg-muted); }
.bar { height: 0.5rem; background: var(--rule); overflow: hidden; }
.bar__fill { height: 100%; background: var(--accent-dim); }
.bar__fill--after { background: var(--accent); }
.result__num { font-variant-numeric: tabular-nums; }

.chapter-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: calc(var(--step) * 1.5); padding-top: var(--step); border-top: 1px solid var(--rule); font-size: var(--fs-meta); color: var(--fg-muted); }
.chapter-nav a { text-decoration: none; }

/* ============================================================
   ESSAY · the exhibit. Bleed grid: contained prose interleaved
   with images that break out to the full viewport.
   ============================================================ */
.essay {
  display: grid;
  grid-template-columns:
    [full-start] minmax(var(--gutter), 1fr)
    [content-start] min(var(--measure), 100% - var(--gutter) * 2) [content-end]
    minmax(var(--gutter), 1fr) [full-end];
  row-gap: var(--step);
  padding-bottom: var(--step);
}
.essay > * { grid-column: content; }
.essay > .bleed { grid-column: full; }
.essay > .bleed img { width: 100%; }
.essay figcaption { font-family: var(--mono); font-size: var(--fs-micro); color: var(--fg-muted); margin-top: 0.5rem; }
.essay > .bleed figcaption { padding-inline: var(--gutter); }

/* full-bleed cover with overlaid title */
.cover { grid-column: full; position: relative; background: var(--bg-sunk); margin-bottom: var(--step); }
.cover img { width: 100%; max-height: 84vh; object-fit: cover; }
.cover__title { position: absolute; inset-inline: 0; bottom: 0; padding: clamp(1.5rem, 6vw, 4rem) var(--gutter); background: linear-gradient(to top, rgba(9,10,11,0.82), transparent); }
.cover__title h1 { font-size: var(--fs-display); max-width: 20ch; margin: 0; }

/* dominant-color placeholder · the loading state, and proof of
   the concept: the placeholder is a swatch pulled from the photo */
.frame { aspect-ratio: var(--ar, 3 / 2); background: var(--lqip, var(--bg-raised)); }

/* ============================================================
   PIPELINE CARD · an honest receipt. Kept fields plain; stripped
   fields struck through, NAMES ONLY — never the values we removed.
   ============================================================ */
.pipeline { font-family: var(--mono); font-size: var(--fs-meta); background: var(--bg-raised); border: 1px solid var(--rule); padding: 1.2rem 1.4rem; margin-top: var(--step); }
.pipeline__eyebrow { font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: 0.12em; color: var(--fg-muted); margin: 0 0 0.9rem; }
.pipeline__rows { margin: 0; }
.pipeline__row { display: flex; justify-content: space-between; gap: 1.2rem; padding-block: 0.4rem; border-bottom: 1px solid var(--rule-soft); }
.pipeline__key { color: var(--fg-muted); margin: 0; }
.pipeline__val { margin: 0; font-variant-numeric: tabular-nums; color: var(--fg); }
.pipeline__row--stripped { color: var(--fg-faint); }
.pipeline__row--stripped .pipeline__key { text-decoration: line-through; }
.pipeline__row--stripped .pipeline__val { color: var(--fg-faint); }
.pipeline__saved { margin: 1rem 0 0; font-size: 1.1rem; color: var(--fg); }
.pipeline__saved b { color: var(--accent); font-weight: 500; }
.pipeline__saved small { display: block; color: var(--fg-muted); font-size: var(--fs-micro); margin-top: 0.2rem; }

/* ============================================================
   BENCHMARK DASHBOARD · promoted from footer to first-class page
   ============================================================ */
.benchmark { padding-block: var(--step); }
.receipt { border: 1px solid var(--rule); background: var(--bg-raised); padding: 1.4rem 1.5rem; margin-bottom: var(--step); }
.receipt__line { font-size: var(--fs-lead); margin: 0 0 0.5rem; }
.receipt__line b { font-family: var(--mono); color: var(--accent); }
.receipt__meta { font-family: var(--mono); font-size: var(--fs-micro); color: var(--fg-muted); margin: 0; }

.matrix { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: var(--fs-meta); }
.matrix caption { text-align: left; font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: 0.12em; color: var(--fg-muted); margin-bottom: 0.6rem; }
.matrix th, .matrix td { text-align: left; padding: 0.55rem 0.8rem 0.55rem 0; border-bottom: 1px solid var(--rule); }
.matrix thead th { color: var(--fg-muted); font-weight: 400; }
.matrix .yes { color: var(--accent); }
.matrix .no  { color: var(--fg-faint); }
.matrix a { color: var(--fg-muted); }

/* ============================================================
   MOTION · progressive-enhancement page transitions, off if unwanted
   ============================================================ */
@view-transition { navigation: auto; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}

/* ---- small screens --------------------------------------------- */
@media (max-width: 40rem) {
  .site-head { flex-wrap: wrap; }
  .chapter { grid-template-columns: auto 1fr; }
  .chapter__status { grid-column: 2; }
  .result__row { grid-template-columns: 4.5rem 1fr auto; }
}