/* ============================================================
   nelson.love — datasheet theme
   Fraunces (serif display) + IBM Plex Mono (labels/data)
   Warm paper · vermilion accent · near-black ink.
   All site styling lives in this file.
   ============================================================ */

/* ---- Tokens ------------------------------------------------ */
:root {
  --paper: #f7f4ec;
  --paper-sunk: #efe9da;
  --paper-panel: #faf8f2;
  --ink: #1c1813;
  --ink-2: #5d5347;
  --ink-3: #8b8173;
  --vermilion: #e0542b;
  --vermilion-deep: #b53e1a;
  --hairline: #ddd5c4;
  --hairline-strong: #c7bda8;

  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --wrap: 66rem;
  --wrap-narrow: 44rem;
  --pad: clamp(1.25rem, 5vw, 3rem);

  --rule: 1px solid var(--hairline);
  --rule-strong: 1px solid var(--hairline-strong);

  /* dot-grid (dotted-Moleskine) — warm ink at low alpha */
  --dot: rgba(28, 24, 19, 0.09);
  --dot-gap: 1.55rem;

  --step-eyebrow: 0.72rem;
  --tracking-label: 0.14em;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-weight: 400;
  font-size: clamp(1.02rem, 0.97rem + 0.3vw, 1.15rem);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* faint dot grid: a dotted-Moleskine sheet, kept subtle */
  background-image: radial-gradient(var(--dot) 1px, transparent 1.4px);
  background-size: var(--dot-gap) var(--dot-gap);
  background-position: 0 0;
  background-attachment: fixed;
}

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

a {
  color: inherit;
}

::selection {
  background: var(--vermilion);
  color: var(--paper);
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.wrap--narrow {
  max-width: var(--wrap-narrow);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  z-index: 100;
}
.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

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

/* ---- Shared atoms ----------------------------------------- */
.eyebrow {
  font-family: var(--mono);
  font-size: var(--step-eyebrow);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 1.4rem;
  height: 0;
  border-top: 2px solid var(--vermilion);
  vertical-align: middle;
  margin-right: 0.7rem;
  transform: translateY(-0.12em);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.28rem 0.6rem;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  color: var(--ink-2);
  background: var(--paper-panel);
  white-space: nowrap;
  line-height: 1;
}
.chip--status {
  border-color: var(--vermilion);
  color: var(--vermilion-deep);
  background: color-mix(in srgb, var(--vermilion) 8%, var(--paper-panel));
}
.chip__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--vermilion);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--vermilion) 22%, transparent);
}
.chip--badge {
  border-color: var(--hairline-strong);
  color: var(--ink-2);
}
.chip--draft {
  border-style: dashed;
  border-color: var(--ink-3);
  color: var(--ink-2);
  background: var(--paper-sunk);
}

.taglist {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
}
.tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  background: var(--paper-sunk);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  padding: 0.18rem 0.5rem;
  line-height: 1.3;
}

/* ---- Header ----------------------------------------------- */
.site-header {
  border-bottom: var(--rule-strong);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(120%) blur(6px);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 0.85rem;
  flex-wrap: wrap;
}
.masthead {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.15;
}
.masthead__name {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.masthead__desig {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 0.15rem;
}
.site-nav {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.site-nav__link {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-2);
  padding: 0.4rem 0.7rem;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.site-nav__link:hover {
  color: var(--ink);
  border-color: var(--hairline-strong);
}
.site-nav__link.is-active {
  color: var(--vermilion-deep);
  border-color: var(--vermilion);
}

/* ---- Hero ------------------------------------------------- */
.hero {
  padding-block: clamp(3rem, 8vw, 6rem) clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: var(--rule);
}
.hero__eyebrow {
  margin-bottom: 1.6rem;
}
.hero__headline {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.6rem, 1.6rem + 5vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 18ch;
}
.hero__headline em {
  font-style: italic;
  font-weight: 500;
  color: var(--vermilion);
}
.hero__lede {
  font-size: clamp(1.12rem, 1rem + 0.6vw, 1.4rem);
  line-height: 1.5;
  color: var(--ink);
  max-width: 46ch;
  margin: 1.8rem 0 0;
}
.hero__lede strong {
  font-weight: 600;
}
.hero__status {
  margin-top: 2rem;
}

/* ---- Sections --------------------------------------------- */
.section {
  padding-block: clamp(2.75rem, 6vw, 4.5rem);
  border-bottom: var(--rule);
}
.section--lead {
  padding-block: clamp(3rem, 7vw, 5rem) clamp(1.5rem, 3vw, 2.5rem);
  border-bottom: none;
}
.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.5rem;
  margin-bottom: 2.25rem;
  border-bottom: var(--rule-strong);
}
.section__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.1rem);
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0;
}
.section__count {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
  white-space: nowrap;
}
.section__count--link {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.section__count--link:hover {
  color: var(--vermilion-deep);
  border-color: var(--vermilion);
}

.page-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.2rem, 1.6rem + 3vw, 3.6rem);
  letter-spacing: -0.02em;
  line-height: 1.04;
  margin: 1rem 0 0;
}
.page-lead {
  font-size: clamp(1.05rem, 1rem + 0.4vw, 1.25rem);
  color: var(--ink-2);
  max-width: 52ch;
  margin: 1.1rem 0 0;
}

/* ---- Work / entry list ------------------------------------ */
.entry-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.entry {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: clamp(1rem, 3vw, 2.25rem);
  padding-block: 2rem;
  border-top: var(--rule);
}
.entry:first-child {
  border-top: none;
  padding-top: 0;
}
.entry__index {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--vermilion);
  padding-top: 0.35rem;
  letter-spacing: 0.02em;
}
.entry__heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.entry__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.3rem, 1.1rem + 0.9vw, 1.75rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0;
}
.entry__title a {
  text-decoration: none;
  background-image: linear-gradient(var(--vermilion), var(--vermilion));
  background-size: 0% 2px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size 0.25s ease, color 0.2s ease;
  padding-bottom: 2px;
}
.entry__title a:hover {
  color: var(--vermilion-deep);
  background-size: 100% 2px;
}
.entry__org {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  margin: 0.55rem 0 0;
}
.entry .taglist {
  margin-top: 0.85rem;
}
.entry__summary {
  margin: 0.9rem 0 0;
  color: var(--ink);
  max-width: 60ch;
}

/* ---- Writing / post list ---------------------------------- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.post-row {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: clamp(1rem, 3vw, 2.25rem);
  padding-block: 1.6rem;
  border-top: var(--rule);
}
.post-row:first-child {
  border-top: none;
  padding-top: 0;
}
.post-row__date {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 0.3rem;
}
.post-row__heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.7rem;
}
.post-row__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.18rem, 1.05rem + 0.6vw, 1.5rem);
  line-height: 1.2;
  margin: 0;
}
.post-row__title a {
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
  padding-bottom: 1px;
}
.post-row__title a:hover {
  color: var(--vermilion-deep);
  border-color: var(--vermilion);
}
.post-row__summary {
  margin: 0.5rem 0 0;
  color: var(--ink-2);
  max-width: 58ch;
}

/* ---- Projects list ---------------------------------------- */
.proj-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.proj {
  padding-block: 1.5rem;
  border-top: var(--rule);
}
.proj:first-child {
  border-top: none;
  padding-top: 0;
}
.proj__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.proj__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.15rem, 1.05rem + 0.5vw, 1.4rem);
  line-height: 1.2;
  margin: 0;
}
.proj__title a {
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
  padding-bottom: 1px;
}
.proj__title a:hover {
  color: var(--vermilion-deep);
  border-color: var(--vermilion);
}
.proj__year {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}
.proj .taglist {
  margin-top: 0.7rem;
}
.proj__summary {
  margin: 0.7rem 0 0;
  color: var(--ink-2);
  max-width: 64ch;
}
.proj__repo {
  margin: 0.6rem 0 0;
}
.proj__repo a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.proj__repo a:hover {
  color: var(--vermilion-deep);
  border-color: var(--vermilion);
}

/* repo link on a project detail page */
.doc__repo {
  margin: 1.2rem 0 0;
}
.doc__repo a {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 2px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.doc__repo a:hover {
  color: var(--vermilion-deep);
  border-color: var(--vermilion);
}

/* ---- Profile + spec rail (signature) ---------------------- */
.section--profile {
  border-bottom: none;
}
.profile-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 3.5rem);
}
.profile-grid__prose .section__title {
  margin-top: 0.4rem;
}
.profile__para {
  margin: 1.1rem 0 0;
  max-width: 62ch;
}
.profile__para em {
  font-style: italic;
}

.spec-rail {
  border: var(--rule-strong);
  background: var(--paper-panel);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 1px 0 var(--hairline);
}
.spec-rail__caption {
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0;
  padding: 0.7rem 1rem;
  background: var(--paper-sunk);
  border-bottom: var(--rule-strong);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.spec-rail__caption::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  background: var(--vermilion);
  display: inline-block;
}
.spec-rail__list {
  margin: 0;
  padding: 0;
}
.spec-rail__row {
  display: grid;
  grid-template-columns: minmax(5.5rem, 8rem) 1fr;
  gap: 0.5rem 1rem;
  padding: 0.7rem 1rem;
  border-top: 1px dotted var(--hairline-strong);
  align-items: baseline;
}
.spec-rail__row:first-child {
  border-top: none;
}
.spec-rail__label {
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.spec-rail__value {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--ink);
}

/* ---- Document (detail) pages ------------------------------ */
.doc {
  padding-block: clamp(2.5rem, 6vw, 4rem) clamp(3rem, 8vw, 5rem);
}
.doc__back {
  margin-bottom: 2.25rem;
}
.doc__back a {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-2);
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 2px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.doc__back a:hover {
  color: var(--vermilion-deep);
  border-color: var(--vermilion);
}
.doc__eyebrow {
  margin-bottom: 1rem;
}
.doc__titlewrap {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.9rem;
}
.doc__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2rem, 1.5rem + 2.5vw, 3.1rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 22ch;
}
.doc__head .taglist {
  margin-top: 1.4rem;
  padding-bottom: 1.6rem;
  border-bottom: var(--rule-strong);
}
.doc__body {
  margin-top: 2rem;
}

/* ---- Prose ------------------------------------------------ */
.prose {
  max-width: 40rem;
}
.prose > * + * {
  margin-top: 1.15rem;
}
.prose p {
  margin: 0;
}
.prose em {
  font-style: italic;
}
.prose strong {
  font-weight: 600;
}
.prose h2,
.prose h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.2;
  margin-top: 2.2rem;
}
.prose ul,
.prose ol {
  margin: 1.15rem 0 0;
  padding-left: 1.3rem;
}
.prose li {
  margin-top: 0.5rem;
}
.prose li::marker {
  color: var(--vermilion);
}
.prose a {
  color: var(--vermilion-deep);
  text-underline-offset: 3px;
}
.prose blockquote {
  margin: 1.5rem 0 0;
  padding: 0.9rem 1.1rem;
  border-left: 3px solid var(--vermilion);
  background: var(--paper-sunk);
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--ink-2);
}
.prose blockquote p {
  margin: 0;
}
.prose code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--paper-sunk);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

/* ---- Footer ----------------------------------------------- */
.site-footer {
  border-top: var(--rule-strong);
  background: var(--paper-panel);
  padding-block: clamp(2.5rem, 5vw, 3.5rem);
}
.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}
.footer-rail {
  margin: 0;
  display: grid;
  gap: 0;
  max-width: 34rem;
}
.footer-rail__row {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 1rem;
  padding: 0.6rem 0;
  border-top: 1px dotted var(--hairline-strong);
  align-items: baseline;
}
.footer-rail__row:first-child {
  border-top: none;
}
.footer-rail dt {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.footer-rail dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink);
}
.footer-rail a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-strong);
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-rail a:hover {
  color: var(--vermilion-deep);
  border-color: var(--vermilion);
}
.site-footer__meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  padding-top: 1.25rem;
  border-top: var(--rule);
}

/* ---- Responsive ------------------------------------------- */
@media (min-width: 56rem) {
  .profile-grid {
    grid-template-columns: 1fr 22rem;
    align-items: start;
  }
  .profile-grid__rail {
    position: sticky;
    top: 5.5rem;
  }
}

@media (max-width: 34rem) {
  .entry {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
  .entry__index {
    padding-top: 0;
    font-size: 0.9rem;
  }
  .post-row {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
  .post-row__date {
    padding-top: 0;
  }
}

/* ---- Motion ----------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}