/* ==========================================================================
   brettsmith.nz — shared stylesheet
   Editorial / Swiss aesthetic: Archivo display + IBM Plex Mono motif,
   deep-green accent, paper-warm background, light & dark themes.
   ========================================================================== */

/* --- Design tokens ------------------------------------------------------- */
:root {
  color-scheme: light;
  --bg: #F6F6F2;
  --warm: #F1EDE2;
  --ink: #131312;
  --body: #4B4B45;
  --mut: #6E6E66;
  --soft: #A9A99E;
  --rule: #131312;
  --rule2: #D8D8CF;
  --acc: #2F5D4E;
  --acc-hover: #24493D;
  --on-acc: #F6F6F2;
  --row-hover: #EFEFE8;
  --hero: clamp(52px, 10.5vw, 126px);

  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Archivo', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

/* Explicit dark selection */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #151513;
  --warm: #1B1A15;
  --ink: #ECEBE4;
  --body: #B9B7AC;
  --mut: #9A998F;
  --soft: #63625A;
  --rule: #4E4E46;
  --rule2: #32322C;
  --acc: #7FB89D;
  --acc-hover: #9BCBB2;
  --on-acc: #131312;
  --row-hover: #1C1C19;
}

/* Auto (system) dark — unless the user explicitly chose light */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #151513;
    --warm: #1B1A15;
    --ink: #ECEBE4;
    --body: #B9B7AC;
    --mut: #9A998F;
    --soft: #63625A;
    --rule: #4E4E46;
    --rule2: #32322C;
    --acc: #7FB89D;
    --acc-hover: #9BCBB2;
    --on-acc: #131312;
    --row-hover: #1C1C19;
  }
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; }

::selection { background: var(--acc); color: var(--on-acc); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* Shared, keyboard-only focus ring */
:where(a, button):focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 3px;
}

/* --- Skip link ----------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  z-index: 10;
  background: var(--acc);
  color: var(--on-acc);
  padding: 10px 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-decoration: none;
}
.skip-link:focus { left: 12px; }

/* --- Page frame ---------------------------------------------------------- */
.page {
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
}

/* --- Header -------------------------------------------------------------- */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 32px;
  padding: 20px clamp(20px, 4vw, 48px);
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}
.brand {
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
}
.header-right {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 28px;
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
}
.site-nav a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.12s ease;
}
.site-nav a:hover { color: var(--acc); }

/* --- Theme toggle -------------------------------------------------------- */
.theme-toggle {
  display: flex;
  border: 1px solid var(--ink);
}
.theme-btn {
  padding: 7px 14px;
  font: 500 10.5px var(--mono);
  letter-spacing: 0.08em;
  border: none;
  cursor: pointer;
  background: transparent;
  color: var(--mut);
}
.theme-btn.is-active {
  background: var(--ink);
  color: var(--bg);
}
.theme-btn:focus-visible { outline-offset: 2px; }

/* --- Hero ---------------------------------------------------------------- */
.hero {
  padding: clamp(44px, 6vw, 64px) clamp(20px, 4vw, 48px) clamp(44px, 6vw, 60px);
}
.hero h1 {
  margin: 0;
  font-size: var(--hero);
  font-weight: 800;
  line-height: 0.94;
  letter-spacing: -0.035em;
  text-transform: uppercase;
}
.hero-row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px 48px;
  align-items: flex-end;
  margin-top: clamp(24px, 4vw, 44px);
}
.hero-lead {
  flex: 1 1 460px;
  min-width: 0;
  max-width: 680px;
}
.hero-role {
  margin: 0;
  font-size: clamp(22px, 2.5vw, 29px);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.hero-desc {
  margin: 14px 0 0;
  font-size: clamp(16.5px, 1.6vw, 19px);
  line-height: 1.55;
  color: var(--body);
  max-width: 52ch;
}
.hero-loc {
  flex: 0 1 auto;
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--mut);
  letter-spacing: 0.04em;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4.5vw, 48px);
}

/* --- Buttons ------------------------------------------------------------- */
.btn,
.btn-primary {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.12s ease, color 0.12s ease;
}
.btn-primary {
  background: var(--acc);
  color: var(--on-acc);
  padding: 16px 28px;
}
.btn-primary:hover { background: var(--acc-hover); }
.btn {
  border: 1px solid var(--ink);
  color: var(--ink);
  padding: 15px 27px;
}
.btn:hover { background: var(--row-hover); }
.btn--wrap { overflow-wrap: anywhere; }

/* --- Generic content section --------------------------------------------- */
.section {
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 24px 48px;
  padding: clamp(32px, 4.5vw, 44px) clamp(20px, 4vw, 48px) clamp(40px, 5vw, 56px);
}
.section--work {
  padding-bottom: clamp(36px, 4.5vw, 48px);
}
.section--warm { background: var(--warm); }

.section-label {
  flex: 0 0 200px;
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--acc);
}
.section-prose {
  flex: 1 1 520px;
  min-width: 0;
  margin: 0;
  font-size: clamp(17px, 1.7vw, 19.5px);
  line-height: 1.6;
  max-width: 64ch;
}
.section-prose strong { font-weight: 600; }

.section-body {
  flex: 1 1 520px;
  min-width: 0;
}

/* --- Selected work list -------------------------------------------------- */
.work-item {
  display: grid;
  grid-template-columns: clamp(34px, 4vw, 56px) 1fr 28px;
  gap: clamp(12px, 2vw, 20px);
  padding: 28px 0;
  border-bottom: 1px solid var(--rule2);
  color: inherit;
  text-decoration: none;
  transition: background-color 0.12s ease;
}
.work-item:first-child { padding-top: 4px; }
.work-item:last-child {
  padding-bottom: 8px;
  border-bottom: none;
}
.work-item:hover { background: var(--row-hover); }
.work-num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--acc);
  padding-top: 8px;
}
.work-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 8px;
}
.work-title {
  margin: 0;
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.work-facet {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mut);
}
.work-desc {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.6;
  color: var(--body);
  max-width: 66ch;
}
.work-arrow {
  font-size: 22px;
  padding-top: 4px;
}

/* --- After hours cards --------------------------------------------------- */
.card-grid {
  flex: 1 1 520px;
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  align-items: start;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 1px solid var(--rule2);
  background: var(--bg);
  padding: 24px 26px 28px;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.12s ease;
}
.card:hover { border-color: var(--ink); }
.card-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.card-title {
  margin: 0;
  flex: 1;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.015em;
}
.card-facet {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mut);
}
.card-arrow {
  font-size: 17px;
  color: var(--soft);
}
.card-desc {
  margin: 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--body);
}
.card-origin {
  margin: 0;
  font-size: 15.5px;
  font-style: italic;
  line-height: 1.6;
  color: var(--mut);
}

/* --- Footer -------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: clamp(32px, 4.5vw, 44px) clamp(20px, 4vw, 48px) 40px;
}
.contact-email {
  font-size: clamp(24px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--acc);
  text-decoration-thickness: 3px;
  text-underline-offset: 7px;
  overflow-wrap: anywhere;
  transition: color 0.12s ease;
}
.contact-email:hover { color: var(--acc); }
.contact-email:focus-visible { outline-offset: 4px; }
.footer-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin-top: clamp(28px, 4vw, 40px);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mut);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
}
.footer-meta a {
  color: var(--mut);
  text-decoration: none;
  transition: color 0.12s ease;
}
.footer-meta a:hover { color: var(--acc); }

/* ==========================================================================
   Essay / work-detail page (Loom)
   ========================================================================== */
.essay {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(44px, 6vw, 72px) clamp(20px, 4vw, 48px) clamp(56px, 7vw, 88px);
}
.essay-eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--acc);
}
.essay-title {
  margin: 18px 0 0;
  font-size: clamp(44px, 8vw, 80px);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}
.essay-lead {
  margin: 20px 0 0;
  font-size: clamp(20px, 2.3vw, 25px);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.35;
  max-width: 26ch;
  text-wrap: pretty;
}
.essay-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 22px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mut);
}
.essay-meta a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--acc);
  text-underline-offset: 4px;
  transition: color 0.12s ease;
}
.essay-meta a:hover { color: var(--acc); }
.essay-rule {
  border: none;
  border-top: 1px solid var(--rule);
  margin: clamp(32px, 5vw, 48px) 0;
}
.essay-body {
  font-size: clamp(17px, 1.7vw, 18.5px);
  line-height: 1.75;
  max-width: 66ch;
}
.essay-body > p { margin: 0; text-wrap: pretty; }
.essay-body > p + p { margin-top: 1.4em; }
.essay-body h2 {
  margin: 52px 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--acc);
}
.essay-body pre {
  margin: 28px 0;
  padding: 22px 24px;
  background: var(--row-hover);
  border: 1px solid var(--rule2);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
}
.essay-body pre code {
  font: inherit;
  color: inherit;
}
.essay-body blockquote {
  margin: 40px 0;
  padding: 24px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-size: clamp(21px, 2.8vw, 26px);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.4;
  text-wrap: pretty;
}
.essay-figure {
  margin: 36px 0 0;
}
.essay-figure .frame {
  height: clamp(220px, 38vw, 340px);
  border: 1px solid var(--rule2);
  overflow: hidden;
}
.essay-figure figcaption {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mut);
}

/* Adapter-boundary diagram (inline SVG inherits theme via currentColor/vars) */
.diagram { width: 100%; height: 100%; display: block; }
.diagram .d-core { fill: var(--acc); }
.diagram .d-core-label { fill: var(--on-acc); }
.diagram .d-chip {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.25;
}
.diagram .d-chip-label { fill: var(--ink); }
.diagram .d-provider-label { fill: var(--mut); }
.diagram .d-wire { stroke: var(--soft); stroke-width: 1.25; }
.diagram .d-boundary {
  stroke: var(--acc);
  stroke-width: 1.25;
  stroke-dasharray: 5 5;
  fill: none;
}
.diagram .d-boundary-label { fill: var(--acc); }
.diagram text {
  font-family: var(--mono);
  letter-spacing: 0.06em;
}

/* --- Essay body: links, lists, stub notes -------------------------------- */
.essay-body a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--acc);
  text-underline-offset: 3px;
  transition: color 0.12s ease;
}
.essay-body a:hover { color: var(--acc); }
.essay-body ul,
.essay-body ol {
  margin: 1.2em 0;
  padding-left: 1.3em;
}
.essay-body li { margin: 0.4em 0; }
.essay-body li::marker { color: var(--acc); }

.essay-origin-note {
  margin: 1.4em 0 0;
  font-style: italic;
  color: var(--mut);
}
.essay-note {
  margin: 2.4em 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mut);
}

/* Blog-post prose headings read as headings, not mono labels. */
.prose h2 {
  font-family: var(--sans);
  font-size: clamp(20px, 2.2vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-transform: none;
  margin: 44px 0 14px;
}

/* --- Writing index ------------------------------------------------------- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.post-item { border-bottom: 1px solid var(--rule2); }
.post-item:last-child { border-bottom: none; }
.post-item > a {
  display: block;
  padding: 26px 0;
  color: inherit;
  text-decoration: none;
}
.post-date {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mut);
}
.post-title {
  margin: 8px 0 0;
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: color 0.12s ease;
}
.post-item > a:hover .post-title { color: var(--acc); }
.post-excerpt {
  margin: 8px 0 0;
  font-size: 16.5px;
  line-height: 1.6;
  color: var(--body);
  max-width: 66ch;
}
.post-item--empty { color: var(--mut); }
.post-item--empty p { margin: 0; padding: 26px 0; }

/* --- Essay footer -------------------------------------------------------- */
.essay-footer {
  border-top: 1px solid var(--rule);
}
.essay-footer-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px clamp(20px, 4vw, 48px) 36px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.essay-footer-nav {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 26px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.essay-footer-nav a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.12s ease;
}
.essay-footer-nav a:hover { color: var(--acc); }
.essay-footer-copy {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mut);
}