@font-face {
  font-family: "IBM Plex Sans";
  src: url("assets/Fonts/IBMPlexSans-VariableFont_wdth,wght.ttf") format("truetype");
  font-weight: 100 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("assets/Fonts/IBMPlexMono-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("assets/Fonts/IBMPlexMono-Medium.ttf") format("truetype");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #ffffff;
  --ink: #000000;
  --muted: #595959;
  --quiet: #8a8a8a;
  --line: #eeeeee;
  --line-inverse: #2b2b2b;
  --motion-fast: 160ms;
  --motion-medium: 220ms;
  --theme-duration: 1s;
  --motion-ease: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  --page-bg: var(--bg);
  --page-ink: var(--ink);
  --page-muted: var(--muted);
  --page-quiet: var(--quiet);
  --page-line: var(--line);
  margin: 0;
  min-width: 320px;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--page-ink);
  background-color: var(--page-bg);
  transition:
    color var(--theme-duration) var(--motion-ease),
    background-color var(--theme-duration) var(--motion-ease);
}

body[data-theme="dark"] {
  --page-bg: var(--ink);
  --page-ink: var(--bg);
  --page-muted: #c7c7c7;
  --page-quiet: #9a9a9a;
  --page-line: var(--line-inverse);
}

body[data-theme="light"] {
  --page-bg: var(--bg);
  --page-ink: var(--ink);
  --page-muted: var(--muted);
  --page-quiet: var(--quiet);
  --page-line: var(--line);
}

a {
  color: inherit;
}

.page-shell {
  width: min(100% - 2rem, 1280px);
  margin: 0 auto;
  padding: 1rem 0 4rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--page-ink);
  background: var(--page-bg);
  transition:
    border-color var(--theme-duration) var(--motion-ease),
    background-color var(--theme-duration) var(--motion-ease);
}

.brand-mark,
.nav-links,
.eyebrow,
.note-label,
.section-kicker,
.row-number,
.row-action,
.row-links,
.date,
.chip-list {
  font-family: "IBM Plex Mono", monospace;
}

.brand-mark {
  font-size: 0.86rem;
  font-weight: 500;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: clamp(0.7rem, 2vw, 1.4rem);
  color: var(--page-muted);
  font-size: 0.78rem;
}

.text-link {
  width: fit-content;
  text-decoration-line: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.28em;
  transition:
    color var(--motion-fast) var(--motion-ease),
    text-decoration-color var(--motion-medium) var(--motion-ease);
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--page-ink);
  text-decoration-color: currentColor;
}

.hero {
  min-height: min(78vh, 760px);
  display: grid;
  align-items: end;
  padding: clamp(4rem, 10vw, 7rem) 0 clamp(2rem, 5vw, 4rem);
}

.hero-copy {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
}

.eyebrow {
  margin: 0;
  color: var(--page-muted);
  font-size: 0.78rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 9ch;
  font-size: clamp(4rem, 9vw, 8.75rem);
  font-weight: 500;
  line-height: 0.88;
  letter-spacing: 0;
}

.lead {
  margin: 0;
  max-width: 50ch;
  font-size: clamp(1.2rem, 2vw, 1.8rem);
  line-height: 1.22;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  align-items: center;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.86rem;
}

.primary-link {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--page-ink);
  padding: 0 1rem;
  color: var(--page-bg);
  background: var(--page-ink);
  text-decoration: none;
  transition:
    color var(--motion-fast) var(--motion-ease),
    background var(--motion-fast) var(--motion-ease);
}

.primary-link:hover,
.primary-link:focus-visible {
  color: var(--page-ink);
  background: var(--page-bg);
}

.note-label {
  color: var(--page-quiet);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.index-section,
.split-section,
.contact-section {
  position: relative;
  display: grid;
  grid-template-columns: minmax(8rem, 0.25fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}

.section-kicker {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  color: var(--page-quiet);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.section-kicker h2 {
  margin: 0;
  color: inherit;
  font-size: 0.88rem;
  font-weight: 500;
}

.index-list {
  display: grid;
}

.index-row {
  min-height: 7rem;
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem 0;
  border-bottom: 1px solid var(--page-line);
  color: inherit;
  text-decoration: none;
}

.index-row-link {
  transition:
    border-color var(--motion-fast) var(--motion-ease),
    padding-left var(--motion-medium) var(--motion-ease);
}

.index-row-link:hover,
.index-row-link:focus-visible {
  padding-left: 0.6rem;
  border-color: var(--page-ink);
}

.row-number,
.row-action {
  color: var(--page-quiet);
  font-size: 0.78rem;
}

.row-main {
  display: grid;
  gap: 0.35rem;
}

.row-main strong {
  font-size: clamp(1.4rem, 3vw, 2.8rem);
  font-weight: 500;
  line-height: 1;
}

.row-main span {
  max-width: 58ch;
  color: var(--page-muted);
  line-height: 1.5;
}

.row-action {
  opacity: 0;
  transform: translateX(-0.35rem);
  transition:
    opacity var(--motion-fast) var(--motion-ease),
    transform var(--motion-fast) var(--motion-ease),
    color var(--motion-fast) var(--motion-ease);
}

.index-row-link:hover .row-action,
.index-row-link:focus-visible .row-action {
  color: var(--page-ink);
  opacity: 1;
  transform: translateX(0);
}

.row-links {
  display: flex;
  gap: 0.85rem;
  color: inherit;
  font-size: 0.82rem;
}

.tool-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.tool-group {
  min-height: 13rem;
  padding: 0;
  counter-reset: tool-counter;
}

.tool-group + .tool-group {
  padding-left: 0;
}

.tool-group h3 {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 500;
  text-transform: uppercase;
  color: inherit;
}

.chip-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
  color: var(--page-muted);
  font-size: 0.76rem;
}

.chip-list li {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0.6rem;
}

.chip-list li::before {
  content: counter(tool-counter, decimal-leading-zero);
  counter-increment: tool-counter;
  color: var(--page-quiet);
}

.timeline {
  display: grid;
}

.timeline article {
  display: grid;
  grid-template-columns: minmax(8rem, 0.28fr) minmax(0, 1fr);
  gap: 1rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--page-line);
}

.date {
  margin: 0;
  color: var(--page-quiet);
  font-size: 0.76rem;
}

.timeline h3 {
  margin: 0;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 500;
}

.timeline p:not(.date) {
  margin: 0.45rem 0 0;
  max-width: 64ch;
  color: var(--page-muted);
  line-height: 1.5;
}

.contact-section {
  padding-bottom: clamp(1rem, 3vw, 2rem);
}

.contact-section h2 {
  margin: 0.45rem 0 0;
  max-width: 12ch;
  font-size: clamp(2.4rem, 7vw, 6rem);
  font-weight: 500;
  line-height: 0.92;
  color: inherit;
}

.contact-section ul {
  align-self: end;
  justify-self: end;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9rem;
}

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

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

  *,
  *::before,
  *::after {
    transition-duration: 1ms !important;
  }
}

@media (max-width: 900px) {
  .page-shell {
    width: min(100% - 1.25rem, 1280px);
  }

  .topbar,
  .hero,
  .index-section,
  .split-section,
  .contact-section,
  .timeline article {
    grid-template-columns: 1fr;
  }

  .topbar {
    display: grid;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    min-height: auto;
    padding-top: 4rem;
  }

  h1 {
    max-width: 9ch;
  }

  .index-row {
    grid-template-columns: 3.2rem minmax(0, 1fr);
  }

  .row-action {
    display: none;
  }

  .row-links {
    grid-column: 2;
    justify-content: flex-start;
  }

  .tool-groups {
    grid-template-columns: 1fr;
  }

  .tool-group,
  .tool-group + .tool-group {
    min-height: 0;
  }

  .contact-section h2 {
    line-height: 0.95;
    font-variation-settings: "wdth" 98;
  }

  .contact-section ul {
    justify-self: start;
  }
}