/* ==========================================================================
   Portfolio — "Swiss Index"
   Light by default; dark follows the system setting or the theme toggle.
   Contrast ratios for every text/background pair were computed against WCAG 2.x.
   ========================================================================== */

/* ---------- Tokens ---------- */

:root {
  color-scheme: light;

  --bg: #FAFAF9;
  --surface: #FFFFFF;
  --surface-2: #F1F3F6;
  --text: #0B1220;
  --logo: #0A2747;
  --muted: #4B5565;
  --hairline: #DDE1E7;
  --border-strong: #7A8496;
  --primary: #1D4ED8;
  --primary-hover: #1E40AF;
  --on-primary: #FFFFFF;
  --accent: #1E3A8A;
  --tint: #DBEAFE;
  --tint-rule: rgba(30, 58, 138, 0.35);
  --focus: #1D4ED8;
  --success: #157A3A;
  --error: #B91C1C;

  --font-display: "Inter Tight", "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 6rem;

  --radius: 4px;
  --header-h: 4rem;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;

    --bg: #0B1220;
    --surface: #111A2C;
    --surface-2: #18233A;
    --text: #E8ECF3;
    --logo: #E8ECF3;
    --muted: #A3ADBF;
    --hairline: #26324A;
    --border-strong: #6B778C;
    --primary: #8AB4FF;
    --primary-hover: #B3CDFF;
    --on-primary: #0B1220;
    --accent: #C7D7FE;
    --tint: #1E2A4A;
    --tint-rule: rgba(199, 215, 254, 0.35);
    --focus: #8AB4FF;
    --success: #4ADE80;
    --error: #F87171;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0B1220;
  --surface: #111A2C;
  --surface-2: #18233A;
  --text: #E8ECF3;
  --logo: #E8ECF3;
  --muted: #A3ADBF;
  --hairline: #26324A;
  --border-strong: #6B778C;
  --primary: #8AB4FF;
  --primary-hover: #B3CDFF;
  --on-primary: #0B1220;
  --accent: #C7D7FE;
  --tint: #1E2A4A;
  --tint-rule: rgba(199, 215, 254, 0.35);
  --focus: #8AB4FF;
  --success: #4ADE80;
  --error: #F87171;
}

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

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

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
p,
ul,
ol,
dl,
dd,
figure {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--primary);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
  transition: color 0.15s ease-out;
}

a:hover {
  color: var(--primary-hover);
  text-decoration-thickness: 2px;
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

::selection {
  background: var(--tint);
  color: var(--text);
}

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

main:focus {
  outline: none;
}

.nowrap {
  white-space: nowrap;
}

.sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.icon {
  flex: none;
  width: 1.25em;
  height: 1.25em;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-sm {
  width: 1em;
  height: 1em;
}

symbol .fill {
  fill: currentColor;
  stroke: none;
}

.container {
  width: min(100% - 2rem, 72rem);
  margin-inline: auto;
}

@media (min-width: 40em) {
  .container {
    width: min(100% - 3rem, 72rem);
  }
}

.skip-link {
  position: absolute;
  top: -5rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 0.75rem;
  color: var(--on-primary);
}

/* ---------- Type helpers ---------- */

.eyebrow,
.cell-label,
.index-head,
.hero-facts dt,
.par dt {
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.display {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 1.5rem + 6vw, 5.5rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.section-title {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 1.2rem + 1.6vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.section-num {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.block-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-3);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.6rem 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease-out, border-color 0.15s ease-out, color 0.15s ease-out;
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: var(--on-primary);
}

.btn-secondary {
  border-color: var(--border-strong);
  color: var(--text);
}

.btn-secondary:hover {
  background: var(--surface-2);
  color: var(--text);
}

.btn[aria-disabled="true"] {
  opacity: 0.65;
  cursor: progress;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--hairline);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 var(--space-3);
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  margin-right: auto;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand:hover {
  color: var(--primary);
}

.brand {
  gap: 0.625rem;
}

.brand-mark {
  flex: none;
  width: 2.25rem;
  height: 2.25rem;
  color: var(--logo);
  transition: color 0.15s ease-out;
}

.brand:hover .brand-mark {
  color: var(--primary);
}

.brand-long {
  display: none;
}

@media (min-width: 64em) {
  .brand-long {
    display: inline;
  }

  .brand-short {
    display: none;
  }
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding-inline: 0.75rem;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
}

.brand,
.btn,
.skip-link {
  text-decoration: none;
}

.nav-list a:hover {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.4em;
}

.nav-list a[aria-current="true"] {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--primary);
  text-underline-offset: 0.4em;
}

.nav-num {
  color: var(--muted);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.15s ease-out;
}

.icon-button:hover {
  background: var(--surface-2);
}

.theme-toggle,
.menu-toggle {
  display: none;
}

.js .theme-toggle {
  display: inline-grid;
}

.theme-toggle[aria-pressed="true"] {
  background: var(--tint);
}

.theme-toggle[aria-pressed="true"] .icon {
  fill: currentColor;
}

.menu-toggle .icon-close,
.menu-toggle[aria-expanded="true"] .icon-open {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

@media (max-width: 39.99em) {
  .header-inner {
    column-gap: var(--space-2);
  }

  .js .header-inner {
    position: relative;
    flex-wrap: nowrap;
  }

  .js .menu-toggle {
    display: inline-grid;
  }

  .js .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: -1rem;
    right: -1rem;
    padding: var(--space-2) 1rem var(--space-3);
    background: var(--bg);
    border-bottom: 1px solid var(--hairline);
  }

  .js .site-header[data-menu="open"] .site-nav {
    display: block;
  }

  .js .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .js .nav-list a {
    width: 100%;
    min-height: 3rem;
    padding-inline: 0;
    font-size: 1.0625rem;
    border-bottom: 1px solid var(--hairline);
  }
}

@media (max-height: 30em) {
  .site-header {
    position: static;
  }

  html {
    scroll-padding-top: 1rem;
  }
}

/* ---------- Sections ---------- */

.section {
  padding-block: var(--space-7);
}

section[id] {
  scroll-margin-top: -3rem;
}

.section-alt {
  background: var(--surface-2);
}

.section-head {
  margin-bottom: var(--space-5);
}

.section-intro {
  max-width: 62ch;
  margin-top: var(--space-2);
  color: var(--muted);
}

@media (min-width: 64em) {
  .section {
    padding-block: var(--space-8);
  }
}

/* ---------- Hero ---------- */

.hero {
  padding-block: var(--space-5) var(--space-6);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: center;
}

.hero-copy {
  display: grid;
  gap: var(--space-4);
  justify-items: start;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-4);
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  font-size: 0.9375rem;
  font-weight: 500;
}

.hero-lede {
  max-width: 46ch;
  font-size: clamp(1.1875rem, 1rem + 0.8vw, 1.5rem);
  line-height: 1.4;
}

.hero-facts {
  display: grid;
  width: 100%;
  max-width: 40rem;
  border-top: 1px solid var(--hairline);
}

.hero-facts > div {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: var(--space-3);
  padding-block: 0.75rem;
  border-bottom: 1px solid var(--hairline);
}

.hero-facts dt {
  padding-top: 0.2em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-portrait {
  width: 100%;
  max-width: 18rem;
}

.hero-portrait img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 50% 30%;
  border: 1px solid var(--hairline);
}

@media (min-width: 40em) {
  .hero-portrait {
    max-width: 22rem;
  }
}

@media (min-width: 64em) and (max-height: 820px) {
  .display {
    font-size: clamp(2.75rem, 1.5rem + 4.5vw, 4.5rem);
  }
}

@media (min-width: 64em) {
  .hero {
    padding-block: var(--space-6) var(--space-6);
  }

  .hero-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--space-4);
  }

  .hero-copy {
    grid-column: 1 / span 8;
  }

  .hero-portrait {
    grid-column: 9 / span 4;
    max-width: none;
  }
}

/* ---------- Metrics ledger ---------- */

.ledger {
  background: var(--tint);
  border-block: 1px solid var(--tint-rule);
}

.ledger-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.ledger-list li {
  padding: var(--space-4) var(--space-3) var(--space-4) 0;
}

.ledger-list li:nth-child(even) {
  padding-left: var(--space-3);
  border-left: 1px solid var(--tint-rule);
}

.ledger-list li:nth-child(n + 3) {
  border-top: 1px solid var(--tint-rule);
}

.ledger-value {
  display: block;
  color: var(--accent);
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 1.2rem + 3vw, 3.25rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.ledger-label {
  display: block;
  max-width: 22ch;
  margin-top: var(--space-2);
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.4;
}

@media (min-width: 40em) {
  .ledger-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .ledger-list li {
    padding: var(--space-5) var(--space-4) var(--space-5) 0;
  }

  .ledger-list li:nth-child(n) {
    border-top: 0;
  }

  .ledger-list li + li {
    padding-left: var(--space-4);
    border-left: 1px solid var(--tint-rule);
  }
}

/* ---------- Work: project index ---------- */

.index-head {
  display: none;
}

.project-index {
  border-top: 2px solid var(--text);
}

.project {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: var(--space-3) var(--space-3);
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--hairline);
}

.project-num {
  grid-column: 1;
  grid-row: 1;
  padding-top: 0.35rem;
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.project-main,
.project-result,
.project-meta {
  grid-column: 2;
  min-width: 0;
}

.project-main {
  display: grid;
  gap: var(--space-2);
  justify-items: start;
}

.project-title {
  font-family: var(--font-display);
  font-size: clamp(1.375rem, 1.1rem + 0.9vw, 1.75rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.project-kind {
  display: block;
  margin-top: 0.15em;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0;
}

.project-context {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.4;
}

.project-summary {
  max-width: 60ch;
}

.project-role {
  max-width: 60ch;
  color: var(--muted);
  font-size: 0.9375rem;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius);
  background: var(--tint);
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.5;
}

.project-result {
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.result-value {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
  font-variant-numeric: tabular-nums;
}

.result-note {
  display: block;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.4;
}

.project-meta {
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.chips li {
  padding: 0.15rem 0.55rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--surface-2);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.section-alt .chips li {
  background: var(--surface);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-4);
}

.project-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 2.75rem;
  font-size: 0.9375rem;
  font-weight: 500;
}

.project-details {
  width: 100%;
  margin-top: var(--space-1);
}

.project-details summary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  color: var(--primary);
  font-size: 0.9375rem;
  font-weight: 600;
  list-style: none;
  cursor: pointer;
}

.project-details summary::-webkit-details-marker {
  display: none;
}

.project-details summary:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.icon-toggle {
  width: 1rem;
  height: 1rem;
}

.project-details[open] .toggle-v {
  display: none;
}

.diagram-figure {
  margin-top: var(--space-3);
}

.diagram {
  display: block;
  width: 100%;
  max-width: 24rem;
  height: auto;
  overflow: visible;
}

.diagram-figure figcaption {
  margin-top: var(--space-1);
  color: var(--muted);
  font-size: 0.8125rem;
}

.dg-box {
  fill: var(--surface);
  stroke: var(--border-strong);
  stroke-width: 1.25;
}

.dg-mine {
  stroke: var(--primary);
  stroke-width: 2.25;
}

.dg-line {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.25;
}

.dg-head {
  fill: var(--muted);
}

.dg-text {
  fill: var(--text);
  font-family: var(--font-body);
  font-size: 11.5px;
  font-weight: 500;
}

.dg-text-sm {
  font-size: 10.5px;
}

.dg-sub {
  fill: var(--muted);
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 400;
}

.par > div {
  display: grid;
  gap: 0.25rem var(--space-3);
  padding-block: 0.75rem;
  border-top: 1px solid var(--hairline);
}

.par dd {
  max-width: 62ch;
}

.cell-label {
  display: block;
}

@media (min-width: 64em) {
  .index-head,
  .project {
    display: grid;
    grid-template-columns: 3.5rem minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1.1fr);
    column-gap: var(--space-4);
  }

  .index-head {
    padding-bottom: 0.75rem;
  }

  .project {
    align-items: start;
  }

  .project-main,
  .project-result,
  .project-meta {
    grid-column: auto;
  }

  .project-num {
    grid-row: auto;
    padding-top: 0.5rem;
  }

  .project-result .cell-label,
  .project-meta .cell-label {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .project-result,
  .project-meta {
    padding-top: 0.4rem;
  }

  .project-links {
    flex-direction: column;
  }

}

/* ---------- Work: also built ---------- */

.also {
  margin-top: var(--space-7);
}

.also-list {
  border-top: 1px solid var(--hairline);
}

.also-item {
  display: grid;
  gap: 0.25rem var(--space-4);
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--hairline);
}

.also-title {
  font-weight: 600;
}

.also-tag {
  display: block;
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 400;
}

.also-desc {
  max-width: 62ch;
  color: var(--muted);
  font-size: 0.9375rem;
}

@media (min-width: 64em) {
  .also-item {
    grid-template-columns: 3.5rem minmax(0, 1.6fr) minmax(0, 2.1fr);
  }

  .also-title {
    grid-column: 2;
  }

  .also-desc {
    grid-column: 3;
  }
}

/* ---------- Experience ---------- */

.roles {
  border-top: 2px solid var(--text);
}

.role {
  display: grid;
  gap: var(--space-2) var(--space-5);
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--hairline);
}

.role-dates {
  color: var(--muted);
  font-size: 0.9375rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.role-title {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.role-org,
.role-name {
  display: block;
}

.role-name {
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0;
}

.role-meta {
  margin-top: var(--space-1);
  color: var(--muted);
  font-size: 0.9375rem;
}

.role-points {
  display: grid;
  gap: 0.5rem;
  max-width: 64ch;
  margin-top: var(--space-3);
  padding-left: 1.25rem;
  list-style: disc;
}

.role-points li::marker {
  color: var(--muted);
}

.role-body .chips {
  margin-top: var(--space-3);
}

@media (min-width: 40em) {
  .role {
    grid-template-columns: 11rem minmax(0, 1fr);
  }

  .role-dates {
    padding-top: 0.3rem;
  }
}

/* ---------- About ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.about-grid .section-head {
  margin-bottom: 0;
}

.about-text {
  display: grid;
  gap: var(--space-3);
  max-width: 62ch;
}

.skills > div {
  display: grid;
  gap: 0.25rem var(--space-3);
  padding-block: 0.75rem;
  border-top: 1px solid var(--hairline);
}

.skills dt {
  font-weight: 600;
}

.plain-list > li {
  padding-block: 0.75rem;
  border-top: 1px solid var(--hairline);
}

.item-title {
  font-weight: 600;
}

.item-meta {
  color: var(--muted);
  font-size: 0.9375rem;
}

@media (min-width: 40em) {
  .skills > div {
    grid-template-columns: 9rem minmax(0, 1fr);
  }
}

@media (min-width: 64em) {
  .about-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: var(--space-4);
    row-gap: var(--space-6);
  }

  .about-grid .section-head {
    grid-column: 1;
    grid-row: 1 / span 3;
  }

  .about-text,
  .about-skills {
    grid-column: 2 / span 2;
  }

  .about-edu {
    grid-column: 2;
  }

  .about-certs {
    grid-column: 3;
  }
}

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.contact-intro {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.contact-lede {
  max-width: 40ch;
  font-size: 1.1875rem;
  line-height: 1.45;
}

.contact-links a,
.contact-static {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 2.75rem;
  font-weight: 500;
  overflow-wrap: anywhere;
}

.contact-links a {
  color: var(--text);
  text-decoration-color: var(--border-strong);
}

.contact-links a:hover {
  color: var(--primary);
  text-decoration-color: currentColor;
}

.contact-form {
  display: none;
  padding: var(--space-5) var(--space-4);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--surface);
}

.js-ready .contact-form {
  display: block;
}

.form-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
}

.form-note {
  margin-top: var(--space-1);
  color: var(--muted);
  font-size: 0.9375rem;
}

.contact-form .form-note {
  margin-bottom: var(--space-4);
}

.field {
  display: grid;
  gap: 0.375rem;
  margin-bottom: var(--space-4);
}

.field label {
  font-size: 0.9375rem;
  font-weight: 600;
}

.field input,
.field textarea {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg);
  line-height: 1.4;
  transition: border-color 0.15s ease-out;
}

.field textarea {
  min-height: 9rem;
  resize: vertical;
}

.field [aria-invalid="true"] {
  border-color: var(--error);
  box-shadow: inset 0 0 0 1px var(--error);
}

.field-error,
.form-status,
.form-alert {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.45;
}

.field-error,
.form-alert {
  color: var(--error);
}

.form-status {
  color: var(--success);
}

.field-error:empty {
  display: none;
}

.form-feedback p:not(:empty) {
  margin-top: var(--space-3);
}

.form-alert a {
  color: inherit;
}

.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

@media (min-width: 40em) {
  .contact-form {
    padding: var(--space-6) var(--space-5);
  }
}

@media (min-width: 64em) {
  .contact-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--space-4);
  }

  .contact-intro {
    grid-column: 1 / span 5;
  }

  .contact-form {
    grid-column: 7 / span 6;
  }
}

/* ---------- 404 ---------- */

.not-found {
  display: grid;
  gap: var(--space-4);
  justify-items: start;
  padding-block: var(--space-8);
}

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

.site-footer {
  border-top: 1px solid var(--hairline);
  font-size: 0.9375rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-block: var(--space-4);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-4);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 2.75rem;
}

/* ---------- Motion (only when the visitor has not asked for less) ---------- */

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }

  .hero-copy {
    animation: rise 0.35s var(--ease) both;
  }

  @keyframes rise {
    from {
      opacity: 0;
      transform: translateY(12px);
    }

    to {
      opacity: 1;
      transform: none;
    }
  }
}

/* ---------- Forced colors / high contrast ---------- */

@media (forced-colors: active) {
  .btn,
  .icon-button,
  .badge,
  .chips li {
    border: 1px solid ButtonText;
  }

  .btn-primary,
  .skip-link {
    border-color: ButtonText;
  }

  .theme-toggle[aria-pressed="true"] {
    border-width: 3px;
  }

  .ledger {
    border-block: 1px solid CanvasText;
  }

  .ledger-list li:nth-child(even),
  .ledger-list li + li {
    border-left-color: CanvasText;
  }

  .ledger-list li:nth-child(n + 3) {
    border-top-color: CanvasText;
  }

  .contact-form,
  .field input,
  .field textarea,
  .hero-portrait img {
    border-color: CanvasText;
  }

  .dg-box {
    fill: Canvas;
    stroke: CanvasText;
  }

  .dg-mine {
    stroke-width: 3;
  }

  .dg-line {
    stroke: CanvasText;
  }

  .dg-head,
  .dg-text,
  .dg-sub {
    fill: CanvasText;
  }

  :focus-visible {
    outline-color: Highlight;
  }
}

/* ---------- Print ---------- */

@media print {
  :root:root:root {
    color-scheme: light;
    --bg: #fff;
    --surface: #fff;
    --surface-2: #fff;
    --text: #000;
    --muted: #333;
    --hairline: #bbb;
    --border-strong: #666;
    --primary: #0b2a9c;
    --accent: #000;
    --tint: #fff;
    --tint-rule: #bbb;
  }

  body {
    font-size: 10.5pt;
  }

  .site-header,
  .skip-link,
  .hero-actions,
  .hero-links,
  .contact-form,
  .footer-links,
  .icon-toggle,
  .project-details summary {
    display: none !important;
  }

  .hero-copy {
    animation: none;
  }

  .section,
  .hero {
    padding-block: 1.5rem;
  }

  .hero-portrait {
    max-width: 35mm;
  }

  .role,
  .par > div,
  .also-item {
    break-inside: avoid;
  }

  h2,
  h3 {
    break-after: avoid;
  }

  .diagram-figure {
    display: none;
  }

  .ledger-list li,
  .role,
  .project {
    padding-block: 0.5rem;
  }

  .ledger-value {
    font-size: 1.75rem;
  }

  .par > div {
    padding-block: 0.2rem;
    border-top: 0;
  }

  .project,
  .project-main,
  .project-meta,
  .role-points {
    gap: 0.35rem;
  }

  .project-details {
    margin-top: 0;
  }

  a,
  .project-links a,
  .contact-links a,
  .contact-static,
  .hero-links a {
    min-height: 0;
  }

  .also-item {
    padding-block: 0.4rem;
  }

  .section-head {
    margin-bottom: 0.75rem;
  }

  .also {
    margin-top: 1.25rem;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    word-break: break-all;
  }
}