/* ─────────────────────────────────────────────────────────────
   ejin biju · portfolio
   brutalist spec-sheet · cloud-infrastructure substrate
   ─────────────────────────────────────────────────────────── */

:root {
  --ink-0:   oklch(14% 0.005 75);
  --ink-1:   oklch(18% 0.006 75);
  --ink-2:   oklch(24% 0.008 75);
  --ink-3:   oklch(38% 0.010 75);
  --ink-4:   oklch(62% 0.012 75);
  --ink-5:   oklch(88% 0.010 75);
  --ink-6:   oklch(96% 0.005 75);

  --amber:   oklch(78% 0.165 75);
  --amber-d: oklch(64% 0.155 70);
  --lime:    oklch(82% 0.140 130);

  --rule:    1px solid var(--ink-2);
  --rule-strong: 1px solid var(--ink-3);

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --t-mega: clamp(2.5rem, 6vw, 5rem);
  --t-h1:   clamp(1.5rem, 2.4vw, 2rem);
  --t-h2:   1.0625rem;
  --t-body: 0.9375rem;
  --t-meta: 0.75rem;

  --pad-x:  clamp(1.25rem, 4vw, 3rem);
  --pad-y:  clamp(3rem, 6vw, 5.5rem);

  --max:    1240px;

  --ease:   cubic-bezier(0.22, 1, 0.36, 1); /* ease-out-quart */
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--ink-0);
  color: var(--ink-5);
  font-family: var(--sans);
  font-size: var(--t-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  /* very faint hairline grid hint at the page edge for substrate feel */
  background-image:
    linear-gradient(to right, var(--ink-1) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ink-1) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: 0 64px;
}

::selection { background: var(--amber); color: var(--ink-0); }

a {
  color: var(--ink-6);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-3);
  padding-bottom: 1px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}
a:hover, a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}
a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

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

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 100;
  background: var(--amber);
  color: var(--ink-0);
  font-family: var(--mono);
  font-size: var(--t-meta);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.5rem 0.875rem;
  border: 0;
  transition: top 200ms var(--ease);
}
.skip-link:focus {
  top: 0.5rem;
}

:target {
  scroll-margin-top: 4.5rem;
}

.mono, .meta, .kicker, .block__index, .project__id,
.status__label, .badge, .tag, .certs th, .certs td.mono,
.spec dt, .kv span:first-child {
  font-family: var(--mono);
  font-feature-settings: "ss01", "cv11";
}

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

/* ── status bar ─────────────────────────────────────────────── */
.statusbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--ink-0);
  border-bottom: var(--rule);
  backdrop-filter: none;
}
.statusbar__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.5rem var(--pad-x);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.25rem;
  align-items: center;
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.status {
  display: inline-flex; align-items: center; gap: 0.5rem;
  color: var(--ink-5);
}
.status__dot {
  width: 8px; height: 8px;
  background: var(--lime);
  box-shadow: 0 0 6px oklch(82% 0.140 130 / 0.6);
}
.status--live .status__label { color: var(--lime); }
.meta--push { margin-left: auto; }

@media (max-width: 720px) {
  .meta--hide-sm { display: none; }
}

/* ── hero ───────────────────────────────────────────────────── */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--pad-y) var(--pad-x) clamp(2rem, 4vw, 3rem);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
@media (min-width: 880px) {
  .hero__grid {
    grid-template-columns: 96px 1fr 280px;
    gap: 3rem;
  }
}
.hero__index {
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--ink-3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  writing-mode: horizontal-tb;
}
@media (min-width: 880px) {
  .hero__index {
    border-right: var(--rule);
    padding-right: 1.25rem;
    height: 100%;
  }
}
.kicker {
  font-family: var(--mono);
  font-size: var(--t-meta);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin: 0 0 1.75rem;
}
.display {
  font-size: var(--t-mega);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.02;
  color: var(--ink-6);
  margin: 0 0 1.5rem;
}
.display__sub {
  display: inline-block;
  color: var(--ink-4);
  font-weight: 400;
  letter-spacing: -0.015em;
  margin-top: 0.4em;
  font-size: 0.62em;
  line-height: 1.15;
}
.lede {
  max-width: 58ch;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink-5);
  margin: 0 0 2rem;
}
.hero__chips {
  list-style: none;
  padding: 0.6rem 0; margin: 0;
  display: flex; flex-wrap: wrap;
  gap: 0.25rem 0;
  border-top: var(--rule);
  border-bottom: var(--rule);
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.hero__chips li {
  padding: 0 1rem 0 0;
  margin-right: 1rem;
  position: relative;
}
.hero__chips li::after {
  content: "";
  position: absolute;
  right: 0; top: 50%;
  transform: translateY(-50%);
  width: 1px; height: 0.9em;
  background: var(--ink-2);
}
.hero__chips li:last-child::after { display: none; }
.hero__chips li:last-child { margin-right: 0; padding-right: 0; }

.hero__spec {
  border: var(--rule);
  background: var(--ink-1);
  padding: 1rem 1.25rem;
  align-self: start;
}
.spec {
  margin: 0; padding: 0;
  display: grid;
  gap: 0.4rem;
}
.spec__row {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  font-size: var(--t-meta);
  align-items: baseline;
}
.spec__row dt {
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.spec__row dd {
  margin: 0;
  color: var(--ink-5);
  font-family: var(--sans);
  font-size: 0.875rem;
}
.dot {
  display: inline-block;
  width: 7px; height: 7px;
  margin-right: 0.4rem;
  vertical-align: 1px;
}
.dot--amber { background: var(--amber); box-shadow: 0 0 6px oklch(78% 0.165 75 / 0.5); }

/* ── section rule ───────────────────────────────────────────── */
.rule {
  max-width: var(--max);
  margin: 0 auto;
  border: 0;
  border-top: var(--rule);
  padding: 0 var(--pad-x);
}

/* ── block (generic section) ────────────────────────────────── */
.block {
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--pad-y) var(--pad-x);
}
.block__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  margin: 0 0 2.5rem;
  align-items: baseline;
}
@media (min-width: 880px) {
  .block__head {
    grid-template-columns: 96px 1fr;
    gap: 3rem;
  }
}
.block__index {
  font-size: var(--t-meta);
  color: var(--amber);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.block__title {
  font-size: var(--t-h1);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink-6);
  margin: 0;
  line-height: 1.1;
}
.block__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 880px) {
  .block__body {
    grid-template-columns: 96px 1fr 280px;
    gap: 3rem;
  }
  .block__body::before { content: ""; }
}
.block__body--full {
  display: block;
}
@media (min-width: 880px) {
  .block__body--full {
    display: grid;
    grid-template-columns: 96px 1fr;
    gap: 3rem;
  }
  .block__body--full::before { content: ""; }
}

/* ── about ──────────────────────────────────────────────────── */
.prose p {
  max-width: 62ch;
  margin: 0 0 1.1rem;
  color: var(--ink-5);
}
.prose p:last-child { margin-bottom: 0; }
.prose__aside {
  border: var(--rule);
  background: var(--ink-1);
  padding: 1rem 1.25rem;
  align-self: start;
}
.prose__aside .meta {
  display: block;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--t-meta);
  margin: 0 0 0.75rem;
}
.kv {
  list-style: none;
  padding: 0; margin: 0;
  display: grid; gap: 0.4rem;
}
.kv li {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  font-size: var(--t-meta);
  align-items: baseline;
}
.kv li span:first-child {
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.kv li span:last-child {
  color: var(--ink-5);
  font-family: var(--sans);
  font-size: 0.875rem;
}

/* ── skills table ───────────────────────────────────────────── */
.stack {
  width: 100%;
  border-collapse: collapse;
  border-top: var(--rule-strong);
}
.stack tr {
  border-bottom: var(--rule);
}
.stack th, .stack td {
  text-align: left;
  vertical-align: top;
  padding: 1rem 0;
}
.stack th {
  width: 14rem;
  font-family: var(--mono);
  font-size: var(--t-meta);
  font-weight: 400;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-right: 1.5rem;
}
.stack td {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
@media (max-width: 720px) {
  .stack th, .stack td { display: block; width: auto; padding: 0.5rem 0; }
  .stack th { padding-top: 1rem; }
  .stack td { display: flex; flex-wrap: wrap; gap: 0.5rem; padding-bottom: 1rem; }
}
.tag {
  display: inline-block;
  border: var(--rule);
  padding: 0.3rem 0.6rem;
  font-size: var(--t-meta);
  color: var(--ink-5);
  text-transform: none;
  letter-spacing: 0.04em;
  font-family: var(--sans);
}
.tag--amber {
  border-color: var(--amber);
  color: var(--amber);
}

/* ── projects ───────────────────────────────────────────────── */
.projects {
  list-style: none;
  padding: 0; margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 720px) {
  .projects {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  .project--lg { grid-column: span 2; }
}
.project {
  border: var(--rule);
  padding: 1.5rem;
  background: var(--ink-1);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color 220ms var(--ease), background 220ms var(--ease);
}
.project:hover {
  border-color: var(--ink-3);
  background: oklch(20% 0.007 75);
}
.project--planned {
  background: transparent;
  border-style: dashed;
  border-color: var(--ink-2);
}
.project--planned:hover {
  background: transparent;
  border-color: var(--ink-3);
}
.project__head {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  flex-wrap: wrap;
}
.project__id {
  font-size: var(--t-meta);
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.project__name {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink-6);
  margin: 0;
}
.project--lg .project__name {
  font-size: 1.625rem;
}
.project__status {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  border: 1px solid var(--ink-3);
  padding: 0.2rem 0.5rem;
}
.project__status--live {
  color: var(--lime);
  border-color: var(--lime);
}
.project__pitch {
  margin: 0;
  color: var(--ink-5);
  max-width: 56ch;
}
.project--lg .project__pitch {
  font-size: 1rem;
  max-width: 64ch;
}
.project__stack {
  list-style: none;
  padding: 0.75rem 0 0; margin: 0;
  display: flex; flex-wrap: wrap;
  gap: 0.25rem 0;
  border-top: var(--rule);
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.project__stack li {
  padding-right: 0.75rem;
  margin-right: 0.75rem;
  position: relative;
}
.project__stack li::after {
  content: "";
  position: absolute;
  right: 0; top: 50%;
  transform: translateY(-50%);
  width: 1px; height: 0.9em;
  background: var(--ink-2);
}
.project__stack li:last-child::after { display: none; }
.project__stack li:last-child { margin-right: 0; padding-right: 0; }
.project__link {
  margin: 0;
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: 0.04em;
}
.muted { color: var(--ink-3); }

/* ── certs table ────────────────────────────────────────────── */
.certs {
  width: 100%;
  border-collapse: collapse;
  border-top: var(--rule-strong);
  border-bottom: var(--rule-strong);
  font-size: 0.9375rem;
}
.certs thead th {
  font-family: var(--mono);
  font-size: var(--t-meta);
  font-weight: 400;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-align: left;
  padding: 0.75rem 1rem 0.75rem 0;
  border-bottom: var(--rule);
}
.certs tbody tr {
  border-bottom: var(--rule);
}
.certs tbody tr:last-child {
  border-bottom: 0;
}
.certs td {
  padding: 0.85rem 1rem 0.85rem 0;
  vertical-align: middle;
  color: var(--ink-5);
}
.certs td.mono {
  color: var(--amber);
  font-size: var(--t-meta);
  letter-spacing: 0.06em;
}
.certs__row--wip td { color: var(--ink-6); }
.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  border: 1px solid var(--ink-3);
  padding: 0.2rem 0.5rem;
}
.badge--amber {
  color: var(--amber);
  border-color: var(--amber);
}
@media (max-width: 720px) {
  .certs thead { display: none; }
  .certs, .certs tbody, .certs tr, .certs td { display: block; width: 100%; }
  .certs tr {
    padding: 0.75rem 0;
  }
  .certs td { padding: 0.15rem 0; }
  .certs td.mono { font-size: 0.875rem; }
}

/* ── contact ────────────────────────────────────────────────── */
.contact__body {
  display: grid;
  gap: 1.5rem;
}
.contact__lede {
  max-width: 50ch;
  font-size: 1.0625rem;
  margin: 0;
  color: var(--ink-5);
}
.contact__list {
  list-style: none;
  padding: 0; margin: 0;
  display: grid;
  gap: 0;
  border-top: var(--rule-strong);
}
.contact__list li {
  display: grid;
  grid-template-columns: 7rem 1fr;
  padding: 0.85rem 0;
  border-bottom: var(--rule);
  font-size: 1rem;
  align-items: baseline;
}
.contact__label {
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── footer ─────────────────────────────────────────────────── */
.foot {
  border-top: var(--rule);
  margin-top: 2rem;
}
.foot__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1rem var(--pad-x);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── reveal on load ─────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(8px);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}