/* HASHJOIN — hashjoin.com
   Shares its palette and IBM Plex type with mogilevskiy.dev (the principal's site),
   but drops the photo masthead and serif display face for a plainer, engineering look. */

:root {
  --bg: #121417;
  --bg-raised: #1a1d22;
  --bg-sunk: #0d0f11;
  --line: #2a2f37;
  --line-strong: #3a414c;
  --text: #ebe6dc;
  --text-dim: #a7a196;
  --text-faint: #7b766d;
  --amber: #e9a640;
  --amber-soft: rgba(233, 166, 64, 0.12);
  --sky: #8fa6bf;
  --sky-soft: rgba(143, 166, 191, 0.12);
  --sage: #9db58a;
  --sage-soft: rgba(157, 181, 138, 0.12);

  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --radius: 10px;
  --maxw: 1120px;
  --gutter: 16px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.65;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--amber); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
::selection { background: var(--amber); color: #121417; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; z-index: 10; background: var(--amber); color: #121417; padding: 8px 12px; border-radius: 6px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

/* ---------- Top bar ---------- */
.topbar { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.nav {
  max-width: var(--maxw); margin: 0 auto; padding: 12px var(--gutter);
  display: flex; align-items: center; justify-content: space-between; gap: 12px 20px; flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand .mark { width: 26px; height: 26px; color: var(--text); flex: none; }
.brand span { font-family: var(--font-mono); font-weight: 700; font-size: 17px; letter-spacing: 0.04em; }
.brand b { color: var(--amber); font-weight: 700; }
.nav ul { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.nav a:not(.brand):not(.btn) { display: block; color: var(--text-dim); font-size: 14.5px; padding: 8px 12px; border-radius: 6px; }
.nav a:not(.brand):not(.btn):hover { color: var(--text); background: rgba(255,255,255,0.06); text-decoration: none; }
.nav a[aria-current="page"]:not(.btn) { color: var(--text); box-shadow: inset 0 -2px 0 var(--amber); border-radius: 0; }
.nav li:last-child { margin-left: 8px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--amber); color: #15120c; font-weight: 600; font-size: 15px;
  padding: 11px 18px; border-radius: 8px; border: 0; cursor: pointer; font-family: inherit; min-height: 44px;
}
.btn:hover { text-decoration: none; filter: brightness(1.07); }
.btn.sm { font-size: 14px; padding: 8px 14px; min-height: 40px; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line-strong); }
.btn.ghost:hover { border-color: var(--amber); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 22px 0 0; }

/* ---------- Hero ---------- */
.hero {
  background-color: var(--bg);
  background-image:
    linear-gradient(180deg, transparent 60%, var(--bg) 100%),
    linear-gradient(rgba(235,230,220,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(235,230,220,0.045) 1px, transparent 1px);
  background-size: auto, 44px 44px, 44px 44px;
  border-bottom: 1px solid var(--line);
}
.hero-in { max-width: var(--maxw); margin: 0 auto; padding: 56px var(--gutter) 44px; }
.hero.tall .hero-in { padding: 88px var(--gutter) 72px; }
.eyebrow {
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--sage); margin: 0 0 14px;
}
.hero h1 {
  font-weight: 600; font-size: clamp(30px, 4.4vw, 50px); line-height: 1.1; letter-spacing: -0.015em;
  margin: 0; max-width: 24ch;
}
.hero.tall h1 { font-size: clamp(34px, 5.4vw, 62px); max-width: 20ch; }
.hero h1 em { font-style: normal; color: var(--amber); }
.hero .sub { font-size: clamp(17px, 1.9vw, 20px); color: var(--text-dim); max-width: 60ch; margin: 18px 0 0; line-height: 1.55; }

/* ---------- Main ---------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 36px var(--gutter) 72px; }
main h2 { font-weight: 600; font-size: clamp(23px, 2.8vw, 30px); line-height: 1.2; letter-spacing: -0.01em; margin: 64px 0 14px; }
main > h2:first-child { margin-top: 12px; }
main > .kicker:first-child { margin-top: 16px; }
main h3 { font-size: 18px; font-weight: 600; margin: 28px 0 8px; line-height: 1.35; }
main p { margin: 0 0 16px; max-width: 72ch; }
.kicker { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-faint); margin: 64px 0 -4px; }
.kicker + h2 { margin-top: 8px; }
.lede { font-size: 19px; line-height: 1.6; max-width: 64ch; }
.muted { color: var(--text-dim); }
.small { font-size: 14px; }
main ul.clean { padding-left: 20px; margin: 0 0 16px; max-width: 72ch; }
main ul.clean li { margin-bottom: 6px; }
code, .mono { font-family: var(--font-mono); font-size: 0.88em; }
:not(pre) > code { background: var(--bg-sunk); border: 1px solid var(--line); padding: 1px 6px; border-radius: 5px; }
.status {
  display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: var(--sage);
  background: var(--sage-soft); padding: 3px 10px; border-radius: 99px;
}
.status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--sage); }

/* ---------- Thesis ---------- */
.thesis { border: 1px solid var(--line); background: var(--bg-raised); padding: 22px 24px; border-radius: var(--radius); margin: 24px 0 28px; }
.thesis p { margin: 0; font-size: 19px; line-height: 1.5; max-width: none; }
.thesis p + p { margin-top: 10px; font-size: 15.5px; color: var(--text-dim); }
.thesis strong { color: var(--amber); font-weight: 600; }

/* ---------- Problems ---------- */
.problems { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 20px 0; }
.problem { border-top: 2px solid var(--line-strong); padding-top: 14px; }
.problem h3 { margin: 0 0 6px; font-size: 16.5px; }
.problem p { color: var(--text-dim); font-size: 15px; margin: 0; }

/* ---------- Offers ---------- */
.offers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 20px 0; }
.offer {
  display: flex; flex-direction: column; border: 1px solid var(--line); background: var(--bg-raised);
  border-radius: 12px; padding: 22px; color: var(--text); transition: border-color .15s ease, transform .15s ease;
}
a.offer:hover { border-color: var(--amber); text-decoration: none; transform: translateY(-2px); }
.offer .tag { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; align-self: flex-start; padding: 2px 8px; border-radius: 4px; margin-bottom: 12px; }
.offer.core { border-color: var(--line-strong); }
.offer .tag.core { color: var(--amber); background: var(--amber-soft); }
.offer .tag.db { color: var(--sky); background: var(--sky-soft); }
.offer .tag.start { color: var(--sage); background: var(--sage-soft); }
.offer h3 { margin: 0 0 8px; font-size: 19px; }
.offer p { color: var(--text-dim); font-size: 15px; margin: 0 0 14px; }
.offer .terms { font-family: var(--font-mono); font-size: 12.5px; color: var(--text-faint); margin-top: auto; padding-top: 12px; border-top: 1px solid var(--line); }
.offer .more { font-size: 14.5px; color: var(--amber); margin-top: 10px; }

/* ---------- Stats / proof ---------- */
.stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 24px 0 8px;
}
.stat { background: var(--bg-raised); padding: 18px 18px 16px; }
.stat .n { font-family: var(--font-mono); font-weight: 600; font-size: 26px; line-height: 1.15; color: var(--amber); }
.stat .l { font-size: 13.5px; color: var(--text-dim); margin-top: 6px; line-height: 1.45; }
.stats-note { font-size: 13px; color: var(--text-faint); margin: 0 0 8px; }

/* ---------- Principal block ---------- */
.principal {
  display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 24px; align-items: center;
  border: 1px solid var(--line); background: var(--bg-raised); border-radius: 14px; padding: 22px; margin: 20px 0;
}
.principal img { width: 160px; height: 160px; object-fit: cover; object-position: center 30%; border-radius: 10px; border: 1px solid var(--line-strong); }
.principal h3 { margin: 0 0 2px; font-size: 21px; }
.principal .role { color: var(--sage); font-size: 14.5px; margin: 0 0 10px; font-weight: 500; }
.principal p { color: var(--text-dim); font-size: 15.5px; margin: 0 0 12px; }

/* ---------- Split columns ---------- */
.split { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 20px 0 24px; }
.split.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.split .col { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 8px; background: var(--bg-raised); }
.split .col h3 { margin: 0 0 4px; font-size: 16.5px; }
.split .col .tag { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; display: inline-block; margin-bottom: 10px; padding: 2px 8px; border-radius: 4px; }
.split .col.ai .tag { color: var(--sky); background: var(--sky-soft); }
.split .col.det .tag { color: var(--amber); background: var(--amber-soft); }
.split .col.human .tag { color: var(--sage); background: var(--sage-soft); }
.split ul { padding-left: 18px; margin: 8px 0 12px; font-size: 14.5px; color: var(--text-dim); }
.split li { margin-bottom: 5px; }
.split p { font-size: 14.5px; color: var(--text-dim); }

/* ---------- Pipeline ---------- */
.pipeline { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); margin: 24px 0 10px; }
.stage { position: relative; padding: 14px; border: 1px solid var(--line); background: var(--bg-raised); margin-right: 18px; border-radius: var(--radius); font-size: 13.5px; line-height: 1.45; }
.stage:last-child { margin-right: 0; }
.stage:not(:last-child)::after {
  content: ""; position: absolute; right: -15px; top: 50%; width: 12px; height: 12px;
  border-top: 2px solid var(--text-faint); border-right: 2px solid var(--text-faint); transform: translateY(-50%) rotate(45deg);
}
.stage .who { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 6px; display: block; }
.stage strong { display: block; font-size: 14.5px; margin-bottom: 4px; }
.stage .d { color: var(--text-dim); }
.stage.human { border-top: 3px solid var(--sage); } .stage.human .who { color: var(--sage); }
.stage.ai { border-top: 3px solid var(--sky); } .stage.ai .who { color: var(--sky); }
.stage.det { border-top: 3px solid var(--amber); } .stage.det .who { color: var(--amber); }

/* ---------- Steps (numbered phases) ---------- */
.steps { list-style: none; padding: 0; margin: 20px 0 24px; counter-reset: step; display: grid; gap: 12px; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 14px; border: 1px solid var(--line); background: var(--bg-raised); border-radius: var(--radius); padding: 16px 18px; }
.steps li::before { content: counter(step, decimal-leading-zero); font-family: var(--font-mono); font-weight: 600; color: var(--amber); font-size: 18px; line-height: 1.4; }
.steps h3 { margin: 0 0 4px; font-size: 16.5px; }
.steps p { margin: 0; color: var(--text-dim); font-size: 15px; }
.steps .when { font-family: var(--font-mono); font-size: 12px; color: var(--text-faint); margin-left: 8px; font-weight: 400; }

/* ---------- Cards (work) ---------- */
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 20px 0; }
.card { border: 1px solid var(--line); background: var(--bg-raised); border-radius: 12px; padding: 22px; }
.card .k { font-family: var(--font-mono); font-size: 12px; color: var(--sage); letter-spacing: 0.06em; }
.card h3 { margin: 6px 0 8px; font-size: 19px; }
.card p { color: var(--text-dim); font-size: 15px; margin: 0 0 12px; }
.card .result { font-family: var(--font-mono); font-size: 13px; color: var(--amber); margin: 0 0 12px; }
.card.wide { grid-column: 1 / -1; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin: 16px 0 24px; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 560px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--text-dim); font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.06em; background: var(--bg-raised); }
tr:last-child td { border-bottom: 0; }
td:first-child { color: var(--text); font-weight: 500; }
td { color: var(--text-dim); }
td.us { color: var(--text); }

/* ---------- FAQ ---------- */
.faq { margin: 16px 0 24px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 14px 0; }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--font-mono); color: var(--amber); }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { color: var(--text-dim); margin: 10px 0 0; }

/* ---------- CTA band ---------- */
.cta {
  margin: 64px 0 0; border: 1px solid var(--line-strong); border-radius: 14px; padding: 28px;
  background:
    linear-gradient(rgba(235,230,220,0.04) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(90deg, rgba(235,230,220,0.04) 1px, transparent 1px) 0 0 / 44px 44px,
    var(--bg-raised);
}
.cta h2 { margin: 0 0 8px; }
.cta p { color: var(--text-dim); margin: 0; }

/* ---------- Contact form ---------- */
.form { display: grid; gap: 16px; margin: 20px 0; max-width: 640px; }
.form label { display: grid; gap: 6px; font-size: 14px; color: var(--text-dim); }
.form input, .form textarea, .form select {
  font: inherit; color: var(--text); background: var(--bg-sunk); border: 1px solid var(--line-strong);
  border-radius: 8px; padding: 11px 12px; width: 100%; min-height: 44px;
}
.form textarea { min-height: 160px; resize: vertical; }
.form input:focus, .form textarea:focus, .form select:focus { outline: 2px solid var(--amber); outline-offset: 1px; border-color: transparent; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.hidden { position: absolute; left: -9999px; }

/* ---------- Footer ---------- */
footer.site { border-top: 1px solid var(--line); background: var(--bg-sunk); }
.foot-in { max-width: var(--maxw); margin: 0 auto; padding: 36px var(--gutter) 20px; display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px 32px; }
.foot-brand p { color: var(--text-dim); font-size: 14px; margin: 10px 0 0; }
.foot-links { list-style: none; margin: 0; padding: 0; font-size: 14px; }
.foot-links li { padding: 4px 0; }
.foot-links a { color: var(--text-dim); }
.foot-links a:hover { color: var(--text); }
.foot-principal { grid-column: 1 / -1; font-size: 14px; color: var(--text-dim); margin: 8px 0 0; padding-top: 16px; border-top: 1px solid var(--line); }
.foot-base { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter) 32px; font-size: 13px; color: var(--text-faint); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.foot-base a { color: var(--text-faint); }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .pipeline { grid-template-columns: 1fr; }
  .stage { margin: 0 0 18px; }
  .stage:not(:last-child)::after { right: auto; left: 50%; top: auto; bottom: -15px; transform: translateX(-50%) rotate(135deg); }
  .offers, .problems, .split { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .lede { font-size: 17.5px; }
  .cards, .split.two, .form .row { grid-template-columns: 1fr; }
  .card.wide { grid-column: auto; }
  .principal { grid-template-columns: 1fr; }
  .principal img { width: 112px; height: 112px; }
  .foot-in { grid-template-columns: 1fr 1fr; }
  .foot-brand { grid-column: 1 / -1; }
  .hero-in { padding: 40px var(--gutter) 32px; }
  .hero.tall .hero-in { padding: 56px var(--gutter) 44px; }
  .nav { gap: 8px; }
  .nav a:not(.brand):not(.btn) { padding: 8px 9px; font-size: 14px; }
  .nav li:last-child { margin-left: 4px; }
}
@media (max-width: 420px) {
  .stats { grid-template-columns: 1fr; }
  .brand span { font-size: 15px; }
}