/* Hub — Zed-like wireframe / monospace / disappearing UI */

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
  font-feature-settings: "liga" 1, "calt" 1;
}

a {
  color: inherit;
}

a:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

/* —— Top bar —— */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem clamp(1.25rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom: var(--border-w) solid var(--line);
}

.logo {
  justify-self: start;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.logo:hover {
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  font-size: 0.8rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

.nav a:hover {
  color: var(--ink);
}

.topbar__cta {
  justify-self: end;
  font-size: 0.8rem;
  color: var(--muted);
  text-decoration: none;
}

.topbar__cta:hover {
  color: var(--accent);
}

/* —— Hero —— */
.hero {
  display: grid;
  gap: 2.5rem;
  padding: clamp(3rem, 8vh, 5rem) clamp(1.25rem, 4vw, 2.5rem) 0;
  max-width: 1080px;
  margin: 0 auto;
  min-height: calc(100vh - 3.5rem);
  align-content: start;
}

@media (min-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
    gap: 3rem;
  }
}

.hero__copy {
  max-width: 28rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  color: var(--faint);
  letter-spacing: 0.04em;
}

.brand {
  margin: 0 0 0.85rem;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.lede {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 36ch;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.btn {
  appearance: none;
  border-radius: 0;
  padding: 0.55rem 0.95rem;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  border: var(--border-w) solid var(--line-strong);
  background: transparent;
  color: var(--ink);
}

.btn--primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

.btn--primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
}

.btn--ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* Wireframe sketch panel */
.hero__stage {
  min-width: 0;
}

.wire {
  border: var(--border-w) solid var(--line-strong);
  background: var(--surface);
}

.wire__bar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0.75rem;
  border-bottom: var(--border-w) solid var(--line);
  font-size: 0.72rem;
  color: var(--faint);
}

.wire__meta {
  color: var(--muted);
}

.wire__body {
  margin: 0;
  padding: 1rem 0.9rem 1.15rem;
  font-size: clamp(0.68rem, 1.4vw, 0.78rem);
  line-height: 1.45;
  color: var(--muted);
  overflow: auto;
  white-space: pre;
}

/* —— Sections —— */
.section {
  padding: 4rem clamp(1.25rem, 4vw, 2.5rem) 0;
  max-width: 860px;
  margin: 0 auto;
}

.section__fig {
  margin: 0 0 0.85rem;
  font-size: 0.72rem;
  color: var(--faint);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
}

.section h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.section__sub {
  margin: 0.4rem 0 1.5rem;
  color: var(--muted);
  font-size: 0.88rem;
  max-width: 44ch;
}

.book-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-w) solid var(--line);
}

.book-list li {
  border-bottom: var(--border-w) solid var(--line);
}

.book-row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 0.1rem;
  text-decoration: none;
  color: inherit;
}

.book-row:hover .book-row__code,
.book-row:hover strong {
  color: var(--accent);
}

.book-row__code {
  font-size: 0.78rem;
  color: var(--faint);
  padding-top: 0.1rem;
}

.book-row__main {
  display: grid;
  gap: 0.2rem;
}

.book-row__main strong {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
}

.book-row__main span {
  color: var(--muted);
  font-size: 0.85rem;
}

.book-row__meta {
  font-size: 0.72rem;
  color: var(--faint);
  white-space: nowrap;
  padding-top: 0.15rem;
}

.tips-panel {
  border: var(--border-w) solid var(--line-strong);
  background: var(--surface);
  padding: 1rem 1.1rem;
  display: grid;
  gap: 0.7rem;
}

.tips-panel p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.tips-panel kbd {
  display: inline-block;
  padding: 0.05rem 0.35rem;
  border: var(--border-w) solid var(--line-strong);
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 0.82em;
}

.footer {
  margin-top: 4.5rem;
  padding: 1.75rem clamp(1.25rem, 4vw, 2.5rem) 2.5rem;
  border-top: var(--border-w) solid var(--line);
  max-width: 860px;
  margin-inline: auto;
  color: var(--faint);
  font-size: 0.8rem;
}

.footer code {
  color: var(--muted);
  border: var(--border-w) solid var(--line);
  padding: 0.05em 0.3em;
  background: var(--surface);
}

.footer__tiny {
  margin-top: 0.35rem;
  font-size: 0.72rem;
}

@media (max-width: 760px) {
  .topbar {
    grid-template-columns: 1fr auto;
  }

  .nav {
    display: none;
  }

  .book-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}