/* spcoon.com — shared styles
   Type: Newsreader (reading) + IBM Plex Mono (labels, facts, metadata)
   One accent: the sky blue carried over from the current site. */

/* Self-hosted fonts (SIL Open Font License; see assets/fonts) */
@font-face { font-family: "Newsreader"; font-style: normal; font-weight: 200 800; font-display: swap;
  src: url("fonts/newsreader-latin-opsz-normal.woff2") format("woff2-variations"), url("fonts/newsreader-latin-opsz-normal.woff2") format("woff2"); unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD; }
@font-face { font-family: "Newsreader"; font-style: italic; font-weight: 200 800; font-display: swap;
  src: url("fonts/newsreader-latin-opsz-italic.woff2") format("woff2-variations"), url("fonts/newsreader-latin-opsz-italic.woff2") format("woff2"); unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD; }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2"); unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD; }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap;
  src: url("fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2"); unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD; }

:root {
  --paper: #ffffff;
  --paper-2: #f3f5f7;
  --ink: #15181c;
  --ink-2: #474d56;
  --ink-3: #6f7681;
  --rule: #dde1e6;
  /* 6. Sky blue. --sky for large type (3.5:1 on white), --accent for links and small text (4.7:1). */
  --sky: #2b8fd6;
  --accent: #1a78bd;
  --accent-wash: #e3f1fb;
  --note: #b0462c;
  --note-wash: #f7e6df;

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;

  --measure: 46rem;
  --wide: 62rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #121417;
    --paper-2: #1e2125;
    --ink: #e9e6df;
    --ink-2: #b9b5ad;
    --ink-3: #8a877f;
    --rule: #34373c;
    --sky: #6cbcf2;
    --accent: #7cc3f4;
    --accent-wash: #1c2a3a;
    --note: #ec8d72;
    --note-wash: #34221c;
  }
}
:root[data-theme="dark"] {
  --paper: #121417; --paper-2: #1e2125; --ink: #e9e6df; --ink-2: #b9b5ad; --ink-3: #8a877f;
  --rule: #34373c; --sky: #6cbcf2; --accent: #7cc3f4; --accent-wash: #1c2a3a; --note: #ec8d72; --note-wash: #34221c;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(1.0625rem, 0.98rem + 0.35vw, 1.1875rem);
  line-height: 1.6;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
::selection { background: var(--accent-wash); }

.skip { position: absolute; left: -999px; }
.skip:focus { left: var(--gutter); top: 0.5rem; background: var(--ink); color: var(--paper); padding: 0.4rem 0.7rem; z-index: 10; }

/* ---------- Site header ---------- */
.site-head {
  max-width: var(--wide); margin: 0 auto; padding: 1.4rem var(--gutter);
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap;
  font-family: var(--mono); font-size: 0.8125rem; letter-spacing: 0.02em;
}
.site-head a { color: var(--ink); text-decoration: none; }
.site-head .name { font-weight: 500; }
.site-head nav { display: flex; gap: 1.4rem; }
.site-head nav a { color: var(--ink-2); }
.site-head nav a:hover, .site-head nav a[aria-current] { color: var(--ink); box-shadow: inset 0 -1px 0 currentColor; }

/* ---------- Case study header ---------- */
.cs-head { max-width: var(--wide); margin: 0 auto; padding: clamp(2.5rem, 8vw, 5.5rem) var(--gutter) 2rem; }
.eyebrow {
  font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 1.2rem;
}
.eyebrow span + span::before { content: "/"; margin: 0 0.6em; color: var(--rule); }
.cs-head h1 {
  font-size: clamp(2.1rem, 1.3rem + 3.4vw, 3.7rem);
  line-height: 1.04; letter-spacing: -0.02em; font-weight: 500;
  margin: 0 0 1.4rem;
}
.cs-head h1 em { font-style: normal; color: inherit; }
.dek { font-size: clamp(1.15rem, 1rem + 0.6vw, 1.4rem); line-height: 1.45; color: var(--ink-2); margin: 0; }

/* ---------- Fact strip ---------- */
.facts {
  max-width: var(--wide); margin: 2.5rem auto 0; padding: 0 var(--gutter);
}
.facts dl {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(10.5rem, 1fr));
  margin: 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule);
}
.facts div { padding: 0.9rem 1rem 1rem 0; }
.facts div + div { padding-left: 1rem; border-left: 1px solid var(--rule); }
@media (max-width: 40rem) {
  .facts div + div { border-left: 0; padding-left: 0; }
  .facts div { border-bottom: 1px solid var(--rule); }
  .facts div:last-child { border-bottom: 0; }
}
.facts dt { font-family: var(--mono); font-size: 0.6875rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 0.25rem; }
.facts dd { margin: 0; font-size: 0.9375rem; line-height: 1.4; }

/* ---------- Results ---------- */
.results { max-width: var(--wide); margin: 0 auto; padding: 3rem var(--gutter) 0; }
.results ol {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: 2rem 2.5rem;
}
.results .num {
  display: block; font-size: clamp(2.8rem, 2rem + 3vw, 4.2rem); line-height: 1; letter-spacing: -0.03em;
  font-weight: 400; font-variant-numeric: lining-nums tabular-nums; color: var(--sky);
}
.results .what { display: block; margin-top: 0.5rem; font-size: 1rem; line-height: 1.4; color: var(--ink-2); }
.results .source {
  margin: 1.6rem 0 0; font-family: var(--mono); font-size: 0.75rem; line-height: 1.55; color: var(--ink-3);
}

/* ---------- Figures ---------- */
figure { margin: 0; }
.fig-wide { max-width: var(--wide); margin: 3.5rem auto; padding: 0 var(--gutter); }
.fig-body { margin: 2.25rem 0; }
figure img { width: 100%; border: 1px solid var(--rule); background: var(--paper-2); }
figcaption {
  margin-top: 0.6rem; font-family: var(--mono); font-size: 0.75rem; line-height: 1.5; color: var(--ink-3);
  display: flex; gap: 0.75rem;
}
figcaption b { color: var(--ink-2); font-weight: 500; white-space: nowrap; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 40rem) { .pair { grid-template-columns: 1fr; } }

/* ---------- Body ---------- */
.cs-body { max-width: var(--measure); margin: 0 auto; padding: 0 var(--gutter); }
.cs-body section { margin-top: 4.5rem; }
.cs-body h2 {
  font-family: var(--mono); font-size: 0.75rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 1.25rem; padding-top: 0.9rem; border-top: 1px solid var(--rule);
}
.cs-body h3 {
  font-size: clamp(1.35rem, 1.15rem + 0.8vw, 1.7rem); line-height: 1.2; letter-spacing: -0.01em; font-weight: 500;
  margin: 2.75rem 0 0.9rem;
}
.cs-body h2 + h3 { margin-top: 0.4rem; }
.cs-body h3 .step { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); margin-right: 0.6rem; letter-spacing: 0; vertical-align: 0.25em; }
.cs-body p { margin: 0 0 1.1rem; }
.cs-body ul, .cs-body ol { padding-left: 1.2rem; margin: 0 0 1.2rem; }
.cs-body li { margin-bottom: 0.35rem; }
.cs-body li::marker { color: var(--ink-3); }
.lede { font-size: 1.15em; line-height: 1.5; }

.lessons { list-style: none; padding: 0 !important; counter-reset: l; }
.lessons li { counter-increment: l; position: relative; padding-left: 2.2rem; margin-bottom: 1.4rem; }
.lessons li::before {
  content: counter(l, decimal-leading-zero); position: absolute; left: 0; top: 0.2rem;
  font-family: var(--mono); font-size: 0.75rem; color: var(--accent);
}
.lessons strong { display: block; font-weight: 500; }

blockquote { margin: 1.5rem 0; padding-left: 1.1rem; border-left: 2px solid var(--accent); color: var(--ink-2); }

/* ---------- Sign-off + pager ---------- */
.signoff { margin-top: 4.5rem; padding: 1.5rem 0; border-top: 1px solid var(--ink); font-size: 1.05rem; }
.pager {
  max-width: var(--wide); margin: 3rem auto 0; padding: 1.5rem var(--gutter);
  display: flex; justify-content: space-between; gap: 1rem; font-family: var(--mono); font-size: 0.8125rem;
  border-top: 1px solid var(--rule);
}
.pager a { color: var(--ink); text-decoration: none; }
.pager a:hover { color: var(--accent); }
.pager small { display: block; color: var(--ink-3); font-size: 0.6875rem; letter-spacing: 0.1em; text-transform: uppercase; }
.pager .next { text-align: right; }

.site-foot {
  max-width: var(--wide); margin: 0 auto; padding: 2.5rem var(--gutter) 3rem;
  font-family: var(--mono); font-size: 0.75rem; color: var(--ink-3); display: flex; gap: 1.25rem; flex-wrap: wrap;
}
.site-foot a { color: var(--ink-2); }

/* ---------- Draft notes (remove before launch) ---------- */
.note {
  font-family: var(--mono); font-size: 0.75rem; line-height: 1.5; color: var(--note);
  background: var(--note-wash); padding: 0.55rem 0.75rem; margin: 0.5rem 0 1.2rem; border-left: 2px solid var(--note);
}
.note::before { content: "DRAFT NOTE — "; font-weight: 500; }
mark.tbd { background: var(--note-wash); color: var(--note); font-family: var(--mono); font-size: 0.85em; padding: 0 0.25em; }
html.hide-notes .note { display: none; }
html.hide-notes mark.tbd { background: none; color: inherit; font-family: inherit; font-size: inherit; padding: 0; }
.notes-toggle {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 5;
  font-family: var(--mono); font-size: 0.75rem; padding: 0.5rem 0.8rem; cursor: pointer;
  background: var(--ink); color: var(--paper); border: 0; border-radius: 2px;
}

/* ---------- Load-in ---------- */
@media (prefers-reduced-motion: no-preference) {
  .cs-head > *, .facts, .results { animation: rise 0.7s cubic-bezier(.2,.7,.2,1) both; }
  .cs-head > :nth-child(2) { animation-delay: 0.06s; }
  .cs-head > :nth-child(3) { animation-delay: 0.12s; }
  .facts { animation-delay: 0.2s; }
  .results { animation-delay: 0.28s; }
  @keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
}

/* ---------- Blue sky / green field ----------
   The page opens under a faint sky and closes over a faint field.
   Both are washed out and masked to white so they read as atmosphere, not imagery. */
body { position: relative; overflow-x: hidden; }
.sky, .field {
  position: absolute; left: 0; right: 0; z-index: -1; pointer-events: none;
  background-repeat: no-repeat; background-size: cover;
}
.sky {
  top: 0; height: clamp(16rem, 34vw, 26rem);
  background-image: url("../images/sky-band.jpg"); background-position: center 30%;
  opacity: 0.32;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,.55) 45%, transparent 100%);
          mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,.55) 45%, transparent 100%);
}
.field {
  bottom: 0; height: clamp(12rem, 26vw, 20rem);
  background-image: url("../images/field-band.jpg"); background-position: center 40%;
  opacity: 0.26;
  -webkit-mask-image: linear-gradient(to top, #000 0%, rgba(0,0,0,.5) 50%, transparent 100%);
          mask-image: linear-gradient(to top, #000 0%, rgba(0,0,0,.5) 50%, transparent 100%);
}
.site-foot { position: relative; padding-bottom: clamp(5rem, 12vw, 8rem); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .sky { opacity: 0.18; }
  :root:not([data-theme="light"]) .field { opacity: 0.14; }
}
:root[data-theme="dark"] .sky { opacity: 0.18; }
:root[data-theme="dark"] .field { opacity: 0.14; }
@media print { .sky, .field { display: none; } }

/* ---------- Responsive refinements ---------- */
/* Fact strip: five across on desktop, two across on tablet, one on small phones */
@media (max-width: 62rem) {
  .facts dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .facts div, .facts div + div { border-left: 0; padding: 0.85rem 1rem 0.95rem 0; border-bottom: 1px solid var(--rule); }
  .facts div:last-child { border-bottom: 0; }
  .facts div:nth-last-child(2):nth-child(odd) { border-bottom: 1px solid var(--rule); }
}
@media (max-width: 30rem) { .facts dl { grid-template-columns: 1fr; } }

/* Tap targets: at least 24px tall, 44px on touch screens */
.site-head nav a, .site-head .name, .site-foot a, .pager a, .eyebrow a { display: inline-block; padding-block: 0.35rem; }
@media (pointer: coarse) {
  .site-head nav a, .site-head .name, .site-foot a { padding-block: 0.7rem; }
  .pager a { padding-block: 0.6rem; }
}
.site-head { padding-block: 0.8rem; }

/* Visible keyboard focus everywhere */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }