/* drewk.net — Safari, Chrome, Firefox */

:root {
  color-scheme: light dark;
  --bg: #f4f1ea;
  --bg-elevated: #faf8f4;
  --fg: #1c1b19;
  --muted: #5e5a52;
  --border: #d4cfc3;
  --link: #1a4d6e;
  --accent: #8b4513;
  --max: 42rem;
  --space: 1.25rem;
  --radius: 0.35rem;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua",
    Georgia, serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121110;
    --bg-elevated: #1a1917;
    --fg: #f0ede6;
    --muted: #a9a49a;
    --border: #3a3732;
    --link: #8ec0e8;
    --accent: #d4a574;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 112.5%;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-serif);
  display: flex;
  flex-direction: column;
}

a {
  color: var(--link);
  text-decoration-thickness: 0.06em;
  text-underline-offset: 0.14em;
}

a:hover {
  text-decoration-thickness: 0.1em;
}

a:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 3px;
}

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--bg-elevated);
  color: var(--fg);
  padding: 0.5rem 0.75rem;
  z-index: 10;
  border: 1px solid var(--border);
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.wrap {
  width: min(100% - 2 * var(--space), var(--max));
  margin-inline: auto;
}

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

/* Header */

.site-header {
  border-bottom: 1px solid var(--border);
  padding: var(--space) 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

.site-mark {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.site-mark a {
  color: inherit;
  text-decoration: none;
}

.site-header nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--fg);
}

.site-header nav a[aria-current="page"] {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.28em;
}

/* Main */

.site-main {
  flex: 1;
  padding: calc(var(--space) * 2.25) 0 calc(var(--space) * 3);
}

.page-header,
.hero {
  margin-bottom: calc(var(--space) * 2);
}

.eyebrow {
  margin: 0 0 0.4rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1,
.page-header h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.85rem, 4.5vw, 2.45rem);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 38rem;
}

.section {
  margin-top: calc(var(--space) * 1.85);
}

.section h2 {
  margin: 0 0 0.65rem;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section p {
  margin: 0 0 0.85rem;
}

.section p:last-child {
  margin-bottom: 0;
}

.muted {
  color: var(--muted);
}

/* Focus list */

.focus-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.focus-list li {
  padding: 0.95rem 1.05rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.focus-list strong {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
  color: var(--fg);
}

/* Cards */

.card-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 36rem) {
  .card-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  display: block;
  height: 100%;
  padding: 0.95rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  border-color: color-mix(in srgb, var(--link) 45%, var(--border));
  box-shadow: 0 1px 0 color-mix(in srgb, var(--fg) 6%, transparent);
}

.card-title {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--link);
}

.card-text {
  display: block;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.4;
}

/* Timeline */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--border);
}

.timeline-item {
  position: relative;
  padding: 0 0 1.75rem 1.35rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -0.42rem;
  top: 0.45rem;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.timeline-item h2 {
  margin: 0 0 0.2rem;
  font-size: 1.2rem;
}

.meta {
  margin: 0 0 0.65rem;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  color: var(--muted);
}

.timeline-item p {
  margin: 0 0 0.65rem;
}

.timeline-item ul {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
}

.timeline-item li {
  margin-bottom: 0.45rem;
}

.timeline-item li:last-child {
  margin-bottom: 0;
}

.footnote {
  margin-top: calc(var(--space) * 2);
  padding-top: var(--space);
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
  color: var(--muted);
}

/* Lists & tags */

.plain-list {
  margin: 0;
  padding-left: 1.2rem;
}

.plain-list li {
  margin-bottom: 0.75rem;
}

.plain-list li:last-child {
  margin-bottom: 0;
}

.pubs .meta {
  display: block;
  margin: 0.2rem 0 0;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.75rem 0 0;
}

.tags span {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  padding: 0.28rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--muted);
}

/* Contact */

.contact-block {
  padding: 1.4rem 1.35rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  max-width: 28rem;
}

.contact-label {
  margin: 0 0 0.35rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.contact-primary {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  word-break: break-word;
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--link) 35%, transparent);
}

.contact-primary:hover {
  border-bottom-color: var(--link);
}

.contact-block p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Contact page — National Brand computation notebook texture
   Green 4×4 quad paper, brown cover framing (inspired by model 43648)
   -------------------------------------------------------------------------- */

body.theme-notebook {
  /* Force a paper-like page even when OS is dark mode */
  /* Brown: midway between original dark and lighter wash */
  --nb-paper: #c5d6b0;
  --nb-paper-deep: #b7c9a0;
  /* Grid / thin line contrast ~50% lower than prior notebook pass */
  --nb-grid: rgba(62, 88, 52, 0.14);
  --nb-grid-major: rgba(48, 72, 40, 0.19);
  --nb-ink: #1a2214;
  --nb-ink-soft: #3d4a32;
  --nb-brown: #624834;
  --nb-brown-mid: #826348;
  --nb-brown-edge: #4c392b;
  --nb-brown-wash: #755945;
  --nb-label: #6e6558;
  --nb-mast: #7a7268;
  --nb-line: color-mix(in srgb, var(--nb-ink) 17%, transparent);
  --nb-line-soft: color-mix(in srgb, var(--nb-mast) 11%, transparent);
  --link: #1f4d2e;
  --fg: var(--nb-ink);
  --muted: var(--nb-ink-soft);
  --border: color-mix(in srgb, var(--nb-brown) 22%, transparent);
  --bg: var(--nb-brown-wash);
  --bg-elevated: var(--nb-paper);
  --accent: var(--nb-brown-mid);

  background:
    radial-gradient(ellipse 120% 80% at 50% 0%, #82644e 0%, transparent 55%),
    linear-gradient(165deg, #6b533f 0%, #5a4533 45%, #4c392b 100%);
  color: var(--nb-ink);
}

/* Soften chrome so the sheet is the focus */
body.theme-notebook .site-header {
  background: color-mix(in srgb, var(--nb-brown-edge) 70%, transparent);
  border-bottom-color: color-mix(in srgb, var(--nb-brown-mid) 22%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

body.theme-notebook .site-header nav a {
  color: color-mix(in srgb, #f5ebe0 70%, transparent);
}

body.theme-notebook .site-header nav a:hover,
body.theme-notebook .site-header nav a[aria-current="page"],
body.theme-notebook .site-mark a {
  color: #fff8f0;
}

body.theme-notebook .site-footer {
  border-top-color: color-mix(in srgb, var(--nb-brown-mid) 22%, transparent);
  color: color-mix(in srgb, #f0e4d4 72%, transparent);
}

body.theme-notebook .footer-links a {
  color: color-mix(in srgb, #f0e4d4 78%, transparent);
}

body.theme-notebook .footer-links a:hover {
  color: #fff8f0;
}

body.theme-notebook .site-main {
  padding-top: calc(var(--space) * 1.5);
  padding-bottom: calc(var(--space) * 2.5);
}

body.theme-notebook .site-main > .wrap {
  width: min(100% - 2 * var(--space), 46rem);
}

/* Open notebook: brown “cover” frame + green quad sheet */
.notebook-page {
  margin: 0;
}

.notebook-sheet {
  /* ~4 squares per inch → 0.25in; use 1.5rem as a friendly CSS analog */
  --quad: 1.5rem;
  position: relative;
  padding: calc(var(--quad) * 1.25) calc(var(--quad) * 1.5) calc(var(--quad) * 1.5);
  color: var(--nb-ink);
  background-color: var(--nb-paper);
  /* Fine green quad (4×4 feel) + slightly stronger major every 4 cells */
  background-image:
    linear-gradient(to right, var(--nb-grid-major) 1px, transparent 1px),
    linear-gradient(to bottom, var(--nb-grid-major) 1px, transparent 1px),
    linear-gradient(to right, var(--nb-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--nb-grid) 1px, transparent 1px),
    linear-gradient(180deg, var(--nb-paper) 0%, var(--nb-paper-deep) 100%);
  background-size:
    calc(var(--quad) * 4) calc(var(--quad) * 4),
    calc(var(--quad) * 4) calc(var(--quad) * 4),
    var(--quad) var(--quad),
    var(--quad) var(--quad),
    100% 100%;
  background-position: -1px -1px, -1px -1px, -1px -1px, -1px -1px, 0 0;
  border: 1px solid color-mix(in srgb, var(--nb-brown) 28%, #c4a882);
  border-radius: 2px 6px 6px 2px;
  box-shadow:
    0 0 0 3px color-mix(in srgb, var(--nb-brown-mid) 75%, #a8886c),
    0 0 0 5px color-mix(in srgb, var(--nb-brown) 80%, #6b5340),
    0 16px 36px rgba(40, 28, 18, 0.36),
    inset 0 0 60px rgba(70, 90, 50, 0.08);
  /* Left binding margin (red margin line on engineering pads) */
  background-clip: padding-box;
}

.notebook-sheet::before {
  content: "";
  position: absolute;
  left: calc(var(--quad) * 1.15);
  top: 0;
  bottom: 0;
  width: 1.5px;
  background: color-mix(in srgb, #8b3a3a 28%, transparent);
  pointer-events: none;
  opacity: 0.28;
}

.notebook-sheet::after {
  /* Paper fiber / slight noise via layered dots (no image asset) */
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.07;
  background-image: radial-gradient(circle at 20% 30%, #2a3a1a 0.6px, transparent 0.7px),
    radial-gradient(circle at 70% 60%, #2a3a1a 0.5px, transparent 0.65px),
    radial-gradient(circle at 40% 80%, #2a3a1a 0.55px, transparent 0.7px);
  background-size: 12px 14px, 18px 16px, 15px 19px;
  mix-blend-mode: multiply;
}

.notebook-mast {
  position: relative;
  z-index: 1;
  margin: 0 0 calc(var(--quad) * 0.75);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--nb-line-soft);
  font-family: var(--font-sans);
}

.notebook-brand {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--nb-mast);
  opacity: 0.72;
}

.notebook-spec {
  margin: 0.2rem 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--nb-mast);
  opacity: 0.58;
}

.notebook-field-row {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: var(--quad);
  margin-bottom: calc(var(--quad) * 1.1);
  font-family: var(--font-sans);
}

.notebook-field {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.15rem;
  border-bottom: 1px solid var(--nb-line);
  min-height: 2.1rem;
  padding-bottom: 0.2rem;
}

.notebook-field-label {
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nb-label);
}

.notebook-field-value {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-style: italic;
  font-weight: 500;
  color: var(--nb-ink);
  line-height: 1.2;
  letter-spacing: 0.01em;
}

/* A/B comparison hints (local / staging only) */
.ab-hint {
  margin: 0.85rem 0 0;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--muted);
}

.ab-hint a {
  font-weight: 600;
}

body.theme-notebook .ab-hint-on-paper {
  color: var(--nb-ink-soft);
}

body.theme-notebook .ab-hint-on-paper a {
  color: var(--link);
}

.notebook-header {
  position: relative;
  z-index: 1;
  margin-bottom: calc(var(--quad) * 1.25);
}

.notebook-header h1 {
  color: var(--nb-ink);
  font-weight: 600;
}

.notebook-header .lede {
  color: var(--nb-ink-soft);
  max-width: 34rem;
}

/* Ink block sits on the grid, slightly lifted like a label card */
body.theme-notebook .contact-block.notebook-ink {
  position: relative;
  z-index: 1;
  max-width: 32rem;
  background: color-mix(in srgb, var(--nb-paper) 88%, #fff 12%);
  border: 1px solid color-mix(in srgb, var(--nb-brown) 15%, transparent);
  border-radius: 1px;
  box-shadow: 0 1px 0 color-mix(in srgb, var(--nb-brown) 6%, transparent);
  padding: calc(var(--quad) * 0.85) var(--quad);
}

body.theme-notebook .contact-label {
  color: var(--nb-brown);
}

body.theme-notebook .contact-primary {
  color: var(--link);
  border-bottom-color: color-mix(in srgb, var(--link) 20%, transparent);
  font-family: var(--font-serif);
  font-weight: 600;
}

body.theme-notebook .contact-primary:hover {
  border-bottom-color: var(--link);
}

.notebook-footnote {
  position: relative;
  z-index: 1;
  margin: calc(var(--quad) * 1.5) 0 0;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--nb-label);
  text-align: right;
}

@media (max-width: 36rem) {
  .notebook-sheet {
    --quad: 1.2rem;
    padding: calc(var(--quad) * 1.1);
  }

  .notebook-field-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .notebook-sheet::before {
    left: calc(var(--quad) * 0.85);
  }
}

@media (prefers-reduced-motion: reduce) {
  body.theme-notebook .notebook-sheet {
    box-shadow:
      0 0 0 3px var(--nb-brown),
      0 0 0 5px var(--nb-brown-edge),
      0 4px 12px rgba(0, 0, 0, 0.35);
  }
}

/* Selection */

::selection {
  background: color-mix(in srgb, var(--accent) 28%, transparent);
  color: var(--fg);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space) 0;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
}

.site-footer p {
  margin: 0;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--link);
  text-decoration: underline;
}

/* Reduced motion */

@media (prefers-reduced-motion: reduce) {
  .card {
    transition: none;
  }
}