/* ─────────────────────────────────────────────────────────────
   bachhost.com — Kaden Bach
   Direction: engineering datasheet. Cool paper ground, monospace
   as the display face, one signal blue. Every dev portfolio is a
   dark terminal; this one reads like published documentation.
   ───────────────────────────────────────────────────────────── */

:root {
  --paper:   #e9ebec;
  --card:    #f6f7f7;
  --ink:     #0f1417;
  --ink-2:   #56626a;
  --rule:    #c6cdd1;
  --rule-2:  #dde1e3;
  --signal:  #1b3ac7;
  --live:    #0c7a55;

  --mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono",
          "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;

  --gut: 2rem;
  --maxw: 62rem;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.62;
  /* faint drafting grid — structure, not decoration */
  background-image:
    linear-gradient(to right, rgba(15,20,23,.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15,20,23,.035) 1px, transparent 1px);
  background-size: 28px 28px;
}

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

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: .6rem 1rem; font-family: var(--mono); z-index: 50;
}
.skip:focus { left: 0; }

a { color: var(--signal); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }

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

code {
  font-family: var(--mono);
  font-size: .92em;
  background: rgba(27,58,199,.07);
  padding: .05em .3em;
}

/* ── shell ──────────────────────────────────────────────── */

.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

@media (min-width: 900px) {
  .shell {
    max-width: 76rem;
    display: grid;
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 3.5rem;
    padding: 0 2.5rem;
  }
}

/* ── left rail ──────────────────────────────────────────── */

.rail {
  padding: 1.5rem 0 0;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 1.5rem;
}

.rail-mark {
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: .16em;
  font-size: .82rem;
  color: var(--ink);
  border: 1.5px solid var(--ink);
  display: inline-block;
  padding: .2rem .45rem;
  margin-bottom: 1rem;
}

.rail-nav ol {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .35rem 1.1rem;
}

.rail-nav a {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
}
.rail-nav a:hover { color: var(--ink); }
.rail-nav a.is-current { color: var(--signal); }

.rail-nav .k {
  font-size: .68rem;
  color: var(--paper);
  background: var(--ink-2);
  padding: .05rem .3rem;
}
.rail-nav a:hover .k { background: var(--ink); }
.rail-nav a.is-current .k { background: var(--signal); }

.rail-hint { display: none; }

@media (min-width: 900px) {
  .rail {
    position: sticky;
    top: 0;
    align-self: start;
    height: 100vh;
    padding: 3.5rem 0 2rem;
    border-bottom: 0;
    border-right: 1px solid var(--rule);
    margin-bottom: 0;
  }
  .rail-nav ol { flex-direction: column; gap: .55rem; }
  .rail-hint {
    display: block;
    font-family: var(--mono);
    font-size: .68rem;
    color: var(--ink-2);
    letter-spacing: .04em;
    margin: 2rem 0 0;
  }
  .rail-hint kbd {
    font-family: var(--mono);
    border: 1px solid var(--rule);
    background: var(--card);
    padding: 0 .25rem;
  }
}

/* ── hero ───────────────────────────────────────────────── */

.hero { padding: 1rem 0 3.5rem; }

@media (min-width: 900px) {
  .hero { padding: 6rem 0 5rem; }
}

.eyebrow {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 1.25rem;
}

.hero h1 {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 8vw, 4.6rem);
  line-height: 1;
  letter-spacing: -.045em;
  margin: 0 0 1.5rem;
}

.lede {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  line-height: 1.55;
  max-width: 34em;
  margin: 0 0 2rem;
  color: var(--ink);
}

.hero-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin: 0;
  padding: 0;
}

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: .8rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  border: 1.5px solid var(--ink);
  padding: .55rem 1.1rem;
  background: transparent;
  transition: background .15s ease, color .15s ease;
}
.btn:hover { background: var(--ink); color: var(--paper); }

.btn-primary {
  background: var(--signal);
  border-color: var(--signal);
  color: #fff;
}
.btn-primary:hover { background: var(--ink); border-color: var(--ink); color: #fff; }

/* ── sections ───────────────────────────────────────────── */

.section {
  padding: 3rem 0;
  border-top: 1px solid var(--rule);
}
.section-last { padding-bottom: 2rem; }

.section-head { margin-bottom: 2rem; }

.section h2 {
  font-family: var(--mono);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 .6rem;
}

.section-note {
  margin: 0;
  max-width: 40em;
  color: var(--ink-2);
  font-size: .96rem;
}

.fine {
  font-family: var(--mono);
  font-size: .74rem;
  line-height: 1.7;
  color: var(--ink-2);
  max-width: 44em;
  margin: 1.75rem 0 0;
  padding-left: .9rem;
  border-left: 2px solid var(--rule);
}

/* ── stats ──────────────────────────────────────────────── */

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin: 0 0 1.5rem;
}

@media (min-width: 640px) {
  .stats { grid-template-columns: repeat(4, 1fr); }
}

.stat {
  background: var(--card);
  padding: .9rem 1rem;
}
.stat dt {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.stat dd {
  font-family: var(--mono);
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -.03em;
  margin: .1rem 0 0;
}

/* ── the plates (signature element) ─────────────────────── */

.plates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  grid-template-columns: 1fr;
}

@media (min-width: 560px) { .plates { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .plates { grid-template-columns: repeat(4, 1fr); } }

.plate {
  background: var(--card);
  padding: 1.1rem 1.1rem 1.25rem;
  position: relative;
}

.plate-cp {
  background: #eef1fb;
  box-shadow: inset 3px 0 0 var(--signal);
}
@media (min-width: 560px) { .plate-cp { grid-column: span 2; } }

.plate h3 {
  font-family: var(--mono);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: -.01em;
  margin: .55rem 0 .35rem;
}

.plate-meta {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--ink-2);
  margin: 0 0 .55rem;
}

.plate-role {
  font-size: .86rem;
  line-height: 1.45;
  margin: 0;
  color: var(--ink);
}

.dot {
  display: block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--rule);
}

.is-lit .dot {
  background: var(--live);
  box-shadow: 0 0 0 3px rgba(12,122,85,.16);
}

.plate .dot { transition: background .4s ease, box-shadow .4s ease; }

/* ── entries (work / education) ─────────────────────────── */

.entry {
  display: grid;
  grid-template-columns: 1fr;
  gap: .35rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--rule-2);
}
.entry:first-of-type { border-top: 0; padding-top: 0; }

@media (min-width: 760px) {
  .entry { grid-template-columns: 12rem minmax(0, 1fr); gap: 2rem; }
}

.entry-when {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding-top: .25rem;
}

.entry-body h3 {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -.02em;
  margin: 0 0 .2rem;
}

.entry-org {
  font-size: .92rem;
  color: var(--ink-2);
  margin: 0 0 .75rem;
}

.entry-body ul {
  margin: 0;
  padding-left: 1.1rem;
}
.entry-body li { margin-bottom: .35rem; }

/* ── project cards ──────────────────────────────────────── */

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

@media (min-width: 800px) { .cards { grid-template-columns: repeat(2, 1fr); } }

.card {
  background: var(--card);
  padding: 1.4rem 1.4rem 1.5rem;
}

.card header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: .7rem;
}

.card h3 {
  font-family: var(--mono);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -.02em;
  margin: 0;
}

.card p { margin: 0 0 .8rem; font-size: .93rem; }

.card-detail {
  border-left: 2px solid var(--signal);
  padding-left: .85rem;
  color: var(--ink-2);
  font-size: .89rem;
}

.card-tech {
  font-family: var(--mono);
  font-size: .71rem;
  letter-spacing: .05em;
  color: var(--ink-2);
  margin: 1rem 0 0;
}

.tag {
  font-family: var(--mono);
  font-size: .63rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-2);
  border: 1px solid var(--rule);
  padding: .12rem .4rem;
  white-space: nowrap;
  flex: none;
}

.tag-live {
  color: var(--live);
  border-color: rgba(12,122,85,.4);
  background: rgba(12,122,85,.06);
}

/* ── stack ──────────────────────────────────────────────── */

.stack-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 700px) { .stack-grid { grid-template-columns: repeat(3, 1fr); gap: 2.5rem; } }

.stack-col h3 {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-2);
  border-bottom: 1px solid var(--rule);
  padding-bottom: .5rem;
  margin: 0 0 .8rem;
}

.stack-col ul { list-style: none; margin: 0; padding: 0; }

.stack-col li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--mono);
  font-size: .84rem;
  padding: .38rem 0;
  border-bottom: 1px dotted var(--rule);
}

.lvl {
  flex: none;
  width: 44px;
  height: 6px;
  background: var(--rule-2);
  position: relative;
}
.lvl::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--signal);
}
.lvl-2::after { width: 50%; }
.lvl-3::after { width: 75%; }
.lvl-4::after { width: 100%; }

/* ── contact + footer ───────────────────────────────────── */

.contact-line { max-width: 38em; margin: 0 0 1.5rem; }

.contact-list { list-style: none; margin: 0; padding: 0; }

.contact-list li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: .5rem 0;
  border-bottom: 1px solid var(--rule-2);
  font-family: var(--mono);
  font-size: .88rem;
}

.contact-list .label {
  flex: none;
  width: 6rem;
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.linklike {
  font: inherit;
  color: var(--signal);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: .18em;
}

.foot {
  border-top: 1px solid var(--rule);
  padding: 2rem 0 3.5rem;
  font-family: var(--mono);
  font-size: .74rem;
  line-height: 1.75;
  color: var(--ink-2);
  max-width: 46em;
}
.foot p { margin: 0 0 .6rem; }
.foot-meta { color: var(--ink-2); opacity: .8; }

/* ── motion ─────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}

@media print {
  body { background: #fff; }
  .rail, .hero-links, .rail-hint { display: none; }
  .shell { display: block; max-width: none; }
  .card, .plate, .stat { background: #fff; }
}