/* DevHub: warm ink ground, editorial serif thesis, copper signal.
   Shape rule: pill buttons, 12px panels, nothing else rounded. */

:root {
  --solder: #191512;
  --relay: #241F1A;
  --bone: #EFE7D8;
  --dim: #A79E8C;
  --copper: #C87F3B;
  --iron: #3A332B;
  --serif: "Newsreader", Georgia, serif;
  --sans: "Instrument Sans", "Helvetica Neue", sans-serif;
  --mono: "JetBrains Mono", "Cascadia Mono", monospace;
}

* { box-sizing: border-box; margin: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--solder);
  color: var(--bone);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--copper);
  color: var(--solder);
  padding: 0.6rem 1rem;
  font-weight: 600;
}
.skip:focus { left: 0; z-index: 100; }

a { color: inherit; }

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

/* Top bar */

.top {
  display: flex;
  align-items: center;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
}

.wordmark {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 1.6rem;
  margin-left: 1rem;
}
.nav a {
  text-decoration: none;
  color: var(--dim);
  font-size: 0.95rem;
}
.nav a:hover { color: var(--bone); }

.top-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.signin {
  color: var(--dim);
  text-decoration: none;
  font-size: 0.95rem;
}
.signin:hover { color: var(--bone); }

/* Buttons: pill, one line */

.cta {
  display: inline-block;
  border-radius: 999px;
  padding: 0.62rem 1.3rem;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}
.cta:active { transform: translateY(1px); }

.cta-solid {
  background: var(--copper);
  color: var(--solder);
}
.cta-solid:hover { background: #D8914E; }

.cta-ghost {
  border: 1px solid var(--iron);
  color: var(--bone);
}
.cta-ghost:hover { border-color: var(--copper); }

.cta-quiet {
  color: var(--copper);
  padding-left: 0.4rem;
  padding-right: 0.4rem;
}
.cta-quiet:hover { text-decoration: underline; text-underline-offset: 4px; }

/* Hero */

.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4.5rem 1.5rem 5.5rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 4rem;
  align-items: center;
}

.hero-copy {
  min-width: 0;
}

.hero-copy h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.5rem, 4.4vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  max-width: 20ch;
  text-wrap: balance;
  padding-left: 1.1rem;
  border-left: 3px solid var(--copper);
}

.hero-copy p {
  margin-top: 1.4rem;
  max-width: 34ch;
  color: var(--dim);
  font-size: 1.08rem;
}

.hero-actions {
  margin-top: 2.1rem;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  flex-wrap: wrap;
}

/* Review artifact: typographic content, no window chrome */

.thread {
  min-width: 0;
  background: var(--relay);
  border: 1px solid var(--iron);
  border-radius: 12px;
  padding: 1.4rem 1.5rem 1.5rem;
}

.thread figcaption {
  font-size: 0.8rem;
  color: var(--dim);
  margin-bottom: 0.9rem;
}

.diff {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
}

.diff .hunk { color: var(--dim); }
.diff .ctx { color: var(--dim); }
.diff .del { color: var(--dim); opacity: 0.55; }
.diff .add {
  color: var(--bone);
  border-left: 2px solid var(--copper);
  padding-left: 0.55rem;
  margin-left: -0.57rem;
}

.thread .note {
  margin-top: 1.1rem;
  padding: 0.9rem 0 0 1.1rem;
  border-left: 3px solid var(--copper);
}
.thread .note p {
  color: var(--bone);
  font-size: 0.95rem;
}
.thread .note cite {
  display: block;
  margin-top: 0.4rem;
  font-style: normal;
  font-size: 0.8rem;
  color: var(--dim);
}

/* Ledger */

.ledger {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 5.5rem;
}

.ledger h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  line-height: 1.15;
  max-width: 22ch;
  margin-bottom: 2.6rem;
}

.ledger-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  border-top: 1px solid var(--iron);
}

.pillar {
  padding: 1.8rem 2rem 0.5rem 0;
}
.pillar + .pillar {
  border-left: 1px solid var(--iron);
  padding-left: 2rem;
}

.pillar h3 {
  font-size: 1.02rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.pillar p {
  color: var(--dim);
  font-size: 0.97rem;
  max-width: 34ch;
}

/* Proof */

.proof {
  border-top: 1px solid var(--iron);
}

.proof blockquote {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4.5rem 1.5rem;
}

.proof p {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  line-height: 1.3;
  max-width: 30ch;
}

.proof cite {
  display: block;
  margin-top: 1.2rem;
  font-style: normal;
  font-size: 0.9rem;
  color: var(--dim);
}

/* Footer */

.foot {
  border-top: 1px solid var(--iron);
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.2rem 1.5rem 3rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
}

.foot nav {
  display: flex;
  gap: 1.6rem;
  flex-wrap: wrap;
}
.foot nav a {
  color: var(--dim);
  text-decoration: none;
  font-size: 0.92rem;
}
.foot nav a:hover { color: var(--bone); }

.fine {
  grid-column: 1 / -1;
  color: var(--dim);
  font-size: 0.82rem;
}

/* Motion: one load-in, transform and opacity only */

@media (prefers-reduced-motion: no-preference) {
  .hero-copy, .thread {
    animation: rise 640ms cubic-bezier(0.16, 1, 0.3, 1) both;
  }
  .thread { animation-delay: 120ms; }
  @keyframes rise {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: none; }
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cta { transition: none; }
}

/* Mobile */

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 2.6rem;
    padding-top: 3rem;
  }
  .ledger-grid { grid-template-columns: 1fr; }
  .pillar { padding: 1.5rem 0 1.2rem; }
  .pillar + .pillar {
    border-left: 0;
    border-top: 1px solid var(--iron);
    padding-left: 0;
  }
  .foot {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
}

@media (max-width: 700px) {
  .top { flex-wrap: wrap; row-gap: 0.7rem; }
  .nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    gap: 1.1rem;
  }
  .hero-copy h1 { font-size: clamp(2.2rem, 8vw, 2.7rem); }
}