/* ============================================================
   ertval.github.io — design tokens + scoped styles
   built in OKLCH, light + dark, mobile-first
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Brand surface — kelp-tinted near-neutral */
  --paper:        oklch(97.2% 0.006 145);   /* #F4F5F1 */
  --paper-2:      oklch(94.8% 0.008 145);   /* card /table tint  */
  --ink:          oklch(18.4% 0.012 145);   /* #0F1411 */
  --ink-2:        oklch(38.0% 0.014 145);   /* secondary text   */
  --ink-3:        oklch(52.0% 0.014 145);   /* tertiary         */
  --rule:         oklch(18.4% 0.012 145 / 0.12);
  --rule-strong:  oklch(18.4% 0.012 145 / 0.22);

  /* Accent — maritime brass-green */
  --accent:       oklch(46.5% 0.090 150);   /* #3D6B4A */
  --accent-ink:   oklch(98.0% 0.006 145);
  --accent-tint:  oklch(46.5% 0.090 150 / 0.08);

  /* Typography */
  --serif: "Fraunces", ui-serif, Georgia, "Times New Roman", serif;
  --sans:  "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* Hierarchy */
  --t-display: clamp(2.2rem, 3.4vw + 1rem, 4.0rem);     /* hero name       */
  --t-h1:      clamp(1.6rem, 1.8vw + 0.8rem, 2.2rem);     /* section hook    */
  --t-h2:      clamp(1.1rem, 0.4vw + 0.9rem, 1.3rem);     /* card /note hook */
  --t-body:    1rem;                                     /* base text       */
  --t-small:   0.85rem;

  /* Spacing — 4 / 16 / 36 rhythm */
  --s-1:  4px;
  --s-2:  16px;
  --s-3:  36px;
  --s-4:  72px;
  --s-5:  128px;

  /* Measure */
  --measure: 68ch;

  /* Radii — minimal */
  --r-1: 2px;
  --r-2: 4px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:       oklch(14.2% 0.008 145);
    --paper-2:     oklch(17.0% 0.010 145);
    --ink:         oklch(92.0% 0.008 145);   /* #E8EDE9 */
    --ink-2:       oklch(74.0% 0.010 145);
    --ink-3:       oklch(58.0% 0.010 145);
    --rule:        oklch(92.0% 0.008 145 / 0.10);
    --rule-strong: oklch(92.0% 0.008 145 / 0.20);
    --accent:      oklch(72.0% 0.110 150);   /* #7FB089 */
    --accent-ink:  oklch(14.2% 0.008 145);
    --accent-tint: oklch(72.0% 0.110 150 / 0.10);

    color-scheme: dark;
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { margin: 0; }
h1, h2, h3, h4, p, ul, ol, dl, dd, dt, blockquote, figure, table { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }

/* ---------- Base ---------- */
html {
  font-family: var(--sans);
  font-size: 16px;
  background: var(--paper);
  color: var(--ink);
}

body {
  font-size: var(--t-body);
  line-height: 1.55;
  font-feature-settings: "ss01", "cv11";
  background: var(--paper);
  color: var(--ink);
  min-height: 100dvh;
  /* subtle paper texture via stacked tints */
  background-image:
    radial-gradient(ellipse 80% 60% at 10% 0%, var(--paper-2) 0%, transparent 60%);
}

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

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

/* Skip link */
.skip {
  position: absolute;
  left: var(--s-2); top: -100px;
  z-index: 1000;
  padding: 10px 14px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: var(--r-2);
  text-decoration: none;
  font-family: var(--mono);
  font-size: var(--t-small);
  transition: top 160ms ease;
}
.skip:focus-visible { top: var(--s-2); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-1);
}

/* Selection */
::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

/* Reduced motion — page is near-static by default */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-block: clamp(56px, 9vh, 96px) clamp(80px, 14vh, 128px);
  padding-inline: clamp(20px, 5vw, 56px);
  max-width: 1280px;
  margin-inline: auto;
}

/* The status rail — signature element */
.rail {
  position: absolute;
  inset: clamp(56px, 9vh, 96px) 0 0 0;
  max-width: 1280px;
  margin-inline: auto;
  pointer-events: none;
  inset-inline-start: clamp(20px, 5vw, 56px);
  inset-inline-end: clamp(20px, 5vw, 56px);
}

.rail__nodes {
  position: sticky;
  top: 24px;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 32px;
  height: 60vh;
}

.rail__node {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--ink);
  opacity: 0.20;
  transition: opacity 220ms ease, background 220ms ease;
  --label: "";
}

.rail__node::after {
  content: var(--label);
  position: absolute;
  transform: translate(calc(-100% - 10px), -2px);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  opacity: 0;
  transition: opacity 220ms ease;
}

.rail__node--solid {
  background: var(--accent);
  opacity: 1;
  position: relative;
  --label: "now";
}

.rail__node--solid::after { opacity: 0.9; }

.hero__inner {
  position: relative;
  max-width: 60ch;
}

.hero__eyebrow {
  font-family: var(--mono);
  font-size: var(--t-small);
  letter-spacing: 0.04em;
  color: var(--ink-3);
  margin-bottom: var(--s-3);
}

.hero__name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: var(--t-display);
  line-height: 0.95;
  letter-spacing: -0.025em;
  font-variation-settings: "opsz" 144;
  color: var(--ink);
  margin-bottom: var(--s-3);
}

.hero__title {
  font-family: var(--sans);
  font-size: clamp(1.125rem, 0.3vw + 1rem, 1.25rem);
  color: var(--ink-2);
  margin-bottom: var(--s-3);
  max-width: 52ch;
}

.hero__tag {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14;
  font-size: clamp(1.15rem, 0.6vw + 1rem, 1.4rem);
  line-height: 1.35;
  color: var(--ink);
  border-inline-start: 2px solid var(--accent);
  padding-inline-start: 18px;
  padding-block: 4px 6px;
  margin: 0 0 var(--s-3);
  max-width: 56ch;
}

.hero__tag p + p { margin-top: 0.4em; }
.hero__tag b { font-weight: 600; font-style: italic; }

/* ---------- Status rows ---------- */
.status {
  margin-block: var(--s-3);
  border-top: 1px solid var(--rule);
  padding-block-start: var(--s-2);
  display: grid;
  gap: var(--s-1);
  max-width: 64ch;
}

.status__row {
  display: grid;
  grid-template-columns: 64px 1fr;
  align-items: baseline;
  gap: var(--s-2);
  padding-block: 8px;
  border-bottom: 1px solid var(--rule);
}

.status__row dt { margin: 0; }
.status__row dd { margin: 0; color: var(--ink-2); font-size: 1.05rem; }
.status__row dd b { color: var(--ink); font-weight: 600; }

/* ---------- Tags ---------- */
.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 7px 3px 6px;
  border-radius: var(--r-1);
  border: 1px solid var(--rule-strong);
  color: var(--ink-2);
  background: transparent;
  vertical-align: middle;
  white-space: nowrap;
}

.tag--accent {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-tint);
}

.tag--ghost { color: var(--ink-3); }

.tag--sm {
  font-size: 0.7rem;
  padding: 2px 6px;
}

/* ---------- Contact ---------- */
.contact {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin-top: var(--s-3);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--r-2);
  text-decoration: none;
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease, color 160ms ease;
  will-change: transform;
}

.btn--accent {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.btn--accent:hover { transform: translateY(-1px); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-strong);
}
.btn--ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
  transform: translateY(-1px);
}

.link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  transition: border-color 160ms ease, color 160ms ease;
}
.link:hover { border-bottom-color: var(--accent); color: var(--accent); }

code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: transparent;
  padding: 0;
  color: var(--ink);
}

/* ---------- Section scaffolding ---------- */
.section-h {
  font-family: var(--serif);
  font-weight: 600;
  font-size: var(--t-h1);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: var(--s-3);
  font-variation-settings: "opsz" 72;
}

.section-sub {
  color: var(--ink-3);
  font-size: var(--t-small);
  letter-spacing: 0.04em;
  margin-bottom: var(--s-3);
  text-transform: uppercase;
}

.section-head {
  margin-bottom: var(--s-3);
}

.stack,
.narrative,
.projects,
.xp,
.meta {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 56px);
}

/* Macro-breaths between sections */
.stack                  { padding-block: clamp(48px, 8vh, 96px);  }
.narrative              { padding-block: clamp(80px, 14vh, 160px); }
.projects               { padding-block: clamp(80px, 14vh, 160px); }
.xp                     { padding-block: clamp(64px, 10vh, 120px); }
.meta                   { padding-block: clamp(64px, 10vh, 120px); }

/* ---------- Stack ---------- */
.stack {
  display: flex;
  flex-direction: column;
}

.stack__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-size: 1.1rem;
  color: var(--ink);
  margin-bottom: var(--s-2);
  align-items: center;
}
.stack__list span[aria-hidden] { color: var(--ink-3); }

.stack__exploring {
  color: var(--ink-2);
  font-size: 0.95rem;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.stack__wields {
  color: var(--ink-3);
  font-size: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- Narrative ---------- */
.narrative {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

.narrative__body {
  color: var(--ink-2);
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 64ch;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

.narrative__body p {
  margin: 0;
}

.note {
  display: grid;
  gap: var(--s-2);
}

.note__head {
  display: flex;
  align-items: baseline;
  gap: var(--s-2);
  border-top: 1px solid var(--rule);
  padding-block-start: var(--s-2);
}

.note__num {
  font-size: var(--t-small);
  color: var(--ink-3);
  letter-spacing: 0.06em;
}

.note__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: var(--t-h2);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--ink);
  font-variation-settings: "opsz" 36;
}

.note__body {
  color: var(--ink-2);
  font-size: 1.05rem;
  max-width: 56ch;
}

.note__repos {
  display: inline-block;
  margin-top: 6px;
  color: var(--ink-3);
  font-size: 0.95rem;
}
.note__repos code { color: var(--ink-2); }

.note__signal {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  color: var(--ink);
  font-size: 1.15rem;
  font-variation-settings: "opsz" 14;
  max-width: 54ch;
}

/* ---------- Projects ---------- */
.projects {
  border-top: 1px solid var(--rule);
  padding-top: var(--s-4);
}

.proj-list {
  display: grid;
  gap: 0;
}

.proj {
  padding-block: var(--s-3);
  border-bottom: 1px solid var(--rule);
  display: grid;
  gap: var(--s-2);
  max-width: 78ch;
}

.proj__head {
  display: flex;
  align-items: baseline;
  gap: var(--s-2);
  flex-wrap: wrap;
}

.proj__title {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(1.15rem, 0.6vw + 1rem, 1.35rem);
  color: var(--ink);
  letter-spacing: -0.01em;
}

.proj__desc {
  color: var(--ink-2);
  font-size: 1.1rem;
  max-width: 72ch;
}

.proj__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  color: var(--ink-3);
  font-size: 0.92rem;
  align-items: center;
}

.proj__links {
  display: flex;
  gap: var(--s-2);
  flex-wrap: wrap;
  font-size: 0.95rem;
  margin-top: 2px;
}

/* ---------- Timeline ---------- */
.xp {
  border-top: 1px solid var(--rule);
  padding-top: var(--s-4);
}

.xp__table {
  font-size: 1.025rem;
  border-top: 1px solid var(--rule);
}

.xp__table th,
.xp__table td {
  text-align: start;
  padding: 14px 16px 14px 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

.xp__table th {
  font-family: var(--mono);
  font-weight: 500;
  font-size: var(--t-small);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-block: 8px 12px;
  border-bottom: 1px solid var(--rule-strong);
}

.xp__table td { color: var(--ink-2); }
.xp__table td:first-child { color: var(--ink); font-weight: 500; }

.xp__sub {
  display: block;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 0.82rem;
  color: var(--ink-3);
  letter-spacing: 0.01em;
  margin-top: 3px;
  line-height: 1.4;
  max-width: 56ch;
}

/* ---------- Meta grid ---------- */
.meta {
  border-top: 1px solid var(--rule);
  padding-top: var(--s-4);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-3);
}

.meta__col {
  min-width: 0;
}

.meta__list {
  display: grid;
  gap: var(--s-1);
  font-size: 1.025rem;
  color: var(--ink-2);
}

.meta__list li {
  padding-block: 4px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
}
.meta__list li:last-child { border-bottom: 0; }

.meta__where {
  font-family: var(--mono);
  font-size: var(--t-small);
  color: var(--ink-3);
  letter-spacing: 0.04em;
  margin-top: 2px;
}

.meta__sub {
  display: block;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--ink-3);
  letter-spacing: 0.01em;
  line-height: 1.4;
  margin-top: 2px;
}

.meta__line {
  font-size: 1.025rem;
  color: var(--ink-2);
  line-height: 1.5;
  margin-bottom: var(--s-2);
}
.meta__line:last-child { margin-bottom: 0; }

/* ---------- Foot ---------- */
.foot {
  border-top: 1px solid var(--rule-strong);
  margin-top: var(--s-5);
  padding-block: var(--s-3);
  padding-inline: clamp(20px, 5vw, 56px);
  background: var(--paper-2);
}

.foot__inner {
  max-width: 1280px;
  margin-inline: auto;
  display: grid;
  gap: var(--s-2);
}

.foot__line {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink-2);
  font-size: 1rem;
}

.contact--foot { margin-top: 0; }

.foot__colophon {
  font-size: 0.82rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--s-1);
}

.foot__interp {
  font-size: 0.92rem;
  color: var(--ink-2);
  letter-spacing: 0.01em;
  display: inline-flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: var(--s-1);
}

/* ---------- Responsive ---------- */

@media (min-width: 720px) {
  .meta { grid-template-columns: 1fr 1fr; }
  .xp__table { font-size: 0.95rem; }
}

@media (min-width: 1024px) {
  .meta { grid-template-columns: repeat(3, 1fr); }
  .hero__inner { max-width: 62ch; }
}

@media (max-width: 720px) {
  .status__row { grid-template-columns: 56px 1fr; }
  .rail { display: none; } /* signature element gracefully degrades */
  .hero__name { font-size: clamp(2.4rem, 9vw, 3.4rem); }
  .hero__tag { font-size: 1.1rem; }
  .xp__table th:nth-child(4),
  .xp__table td:nth-child(4) { display: none; } /* drop location on mobile */
  .xp__table { font-size: 0.95rem; }
}

/* First-paint entrance — quiet fade, not cascade */
@media (prefers-reduced-motion: no-preference) {
  .hero { animation: fade 520ms ease both; }
}

@keyframes fade {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}