/* ==========================================================================
   Dr Richard Grainger — personal site
   Direction: "Lab Notebook" — cool neutrals, monospace metadata, RG stamp,
   clean paper (no texture). Journal-style figure treatment for images.
   Fonts: IBM Plex Sans (text) + IBM Plex Mono (metadata, code).
   ========================================================================== */

@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;1,400&family=IBM+Plex+Mono:wght@400;500&display=swap");

:root {
  --paper: #f7f8f8;
  --ink: #1a1e22;
  --ink-soft: #33383d;
  --ink-muted: #5d646b;
  --ink-faint: #7a828a;
  --rule: #dde1e4;
  --panel: #eef1f3;
  --chip: #e8ecef;
  --accent: #1f5f9e;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

/* --- Base ----------------------------------------------------------- */

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  padding: 0 24px;
  max-width: 760px;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

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

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* --- Header ----------------------------------------------------------
   Layout: [RG stamp + name .......... nav]
           [// subtitle                   ]
           ================================  (2px ink rule)            */

.site-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  padding: 44px 0 0;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 26px;
}

.site-name {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.site-name:hover { text-decoration: none; }

/* The RG maker's stamp */
.site-name::before {
  content: "RG";
  flex: none;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--ink);
  font: 500 15px var(--mono);
  color: var(--ink);
}

.site-subtitle {
  grid-row: 2;
  margin: 6px 0 0;
  font: 400 14px var(--mono);
  color: var(--accent);
}
.site-subtitle::before { content: "// "; }

.site-nav {
  grid-column: 2;
  grid-row: 1;
  display: flex;
  gap: 22px;
  font: 500 13.5px var(--mono);
}
.site-nav a { color: var(--ink); }
.site-nav a:hover {
  text-decoration: none;
  box-shadow: inset 0 -2px 0 var(--accent);
}

/* --- Homepage ---------------------------------------------------------.intro { max-width: 540px; } */

.intro p {
  margin: 36px 0 0;
  font-size: 16px;
  color: var(--ink-muted);
}

.article-list { margin-top: 8px; }
.article-list ul { list-style: none; margin: 0; padding: 0; }

.article-list li {
  display: grid;
  grid-template-columns: 120px 1fr;
  column-gap: 20px;
  padding: 24px 0;
}
.article-list li + li { border-top: 1px solid var(--rule); }

.article-list-meta {
  grid-column: 1;
  grid-row: 1;
  padding-top: 4px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.article-list-date {
  font: 400 13px/1.5 var(--mono);
  color: var(--ink-faint);
}

.article-list-category {
  border: 1px solid #b8bfc5;
  padding: 2px 7px;
  font: 500 10.5px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.article-list-title {
  grid-column: 2;
  grid-row: 1;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}
.article-list-title:hover { color: var(--accent); text-decoration: none; }

.article-list-summary {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 15px;
  color: var(--ink-muted);
}

/* --- Article pages ---------------------------------------------------- */

.article-header { margin: 44px 0 0; }

.article-header h1 {
  margin: 10px 0 0;
  font-size: 30px;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.article-meta {
  margin: 0;
  font: 400 13px var(--mono);
  color: var(--accent);
  order: -1; /* header is not flex; kept for clarity — meta sits above h1 in layout below */
}

/* Put the date line above the title, readout-style */
.article-header { display: flex; flex-direction: column; }
.article-header h1 { order: 2; }
.article-meta { order: 1; }

.article > p:first-of-type { margin-top: 28px; }

/* Section headings — mono "§" index lines */
.article h2 {
  margin: 34px 0 0;
  font: 500 13px var(--mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}
.article h2::before { content: "§ "; }

.article h3 {
  margin: 26px 0 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.article p { margin: 12px 0 0; }
.article p + p { margin-top: 14px; }

.article ul, .article ol { margin: 14px 0 0; padding-left: 26px; }
.article li { margin-top: 6px; }
.article li::marker { color: var(--accent); font-family: var(--mono); font-size: 14px; }

.article blockquote {
  margin: 24px 0 0;
  padding: 14px 20px;
  background: var(--panel);
  border-left: 3px solid var(--accent);
  color: var(--ink-muted);
  font-size: 15.5px;
}
.article blockquote p { margin: 0; }
.article blockquote p + p { margin-top: 10px; }

.article code {
  font: 400 0.85em var(--mono);
  background: var(--chip);
  color: var(--ink);
  padding: 1px 5px;
  border-radius: 3px;
}

.article pre {
  margin: 24px 0 0;
  padding: 16px 20px;
  background: var(--ink);
  color: #e8ecef;
  font: 400 14px/1.6 var(--mono);
  overflow-x: auto;
}
.article pre code { background: none; color: inherit; padding: 0; }

.article hr {
  margin: 32px 0;
  border: none;
  border-top: 1px solid var(--rule);
}

.article table {
  margin: 24px 0 0;
  border-collapse: collapse;
  width: 100%;
  font-size: 15px;
}
.article th {
  font: 500 12.5px var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: left;
  color: var(--ink-faint);
  border-bottom: 2px solid var(--ink);
  padding: 8px 12px 8px 0;
}
.article td {
  border-bottom: 1px solid var(--rule);
  padding: 8px 12px 8px 0;
}

/* --- Figures: journal-style treatment for images ----------------------
   In Markdown:  ![Fracture surface, 2000×](/img/fig1.jpg)
   Or richer:    <figure><img …><figcaption>Fig. 1 — …</figcaption></figure> */

.article img {
  display: block;
  max-width: 100%;
  margin: 28px 0 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  padding: 16px 0;
}
.credit {
  display: block;
  text-align: right;
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: var(--color-muted);
}

.article figure { margin: 28px 0 0; }
.article figure img { margin: 0; }
.article figcaption {
  margin-top: 8px;
  font: 400 12.5px/1.6 var(--mono);
  color: var(--ink-faint);
}

/* Specimen-record portrait (About page):
   <img class="portrait" src="…" alt="Dr Richard Grainger">              */
.article img.portrait,
img.portrait {
  width: 200px;
  height: 250px;
  object-fit: cover;
  object-position: 50% 20%;
  border: 1px solid var(--ink);
  padding: 0;
  float: left;
  margin: 28px 32px 12px 0;
}

/* --- Footer ------------------------------------------------------------ */

.site-footer {
  margin-top: 64px;
  border-top: 1px solid var(--rule);
  padding: 20px 0 44px;
}
.site-footer p {
  margin: 0;
  font: 400 12.5px var(--mono);
  color: var(--ink-faint);
}
.site-footer a { color: var(--ink-faint); text-decoration: underline; text-underline-offset: 3px; }
.site-footer a:hover { color: var(--accent); }

/* --- Small screens ------------------------------------------------------ */

@media (max-width: 620px) {
  body { font-size: 16px; padding: 0 18px; }

  .site-header { grid-template-columns: 1fr; padding-top: 32px; }
  .site-nav { grid-column: 1; grid-row: 3; margin-top: 18px; }

  .article-list li { grid-template-columns: 1fr; row-gap: 4px; }
  .article-list-meta { grid-row: auto; padding-top: 0; flex-direction: row; align-items: baseline; gap: 12px; }
  .article-list-title { grid-column: 1; }
  .article-list-summary { grid-column: 1; }

  .article-header h1 { font-size: 25px; }

  img.portrait { float: none; margin-right: 0; }
}