.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar {
  position: relative;
  top: auto;
  min-height: 64px;
  height: auto;
  gap: 24px;
  padding-block: 10px;
}

.brand-lockup,
.topbar-actions,
.primary-nav {
  display: flex;
  align-items: center;
}

.brand-lockup {
  min-width: 0;
}

.brand-signal {
  margin-left: 10px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.stackhal-site .brand-mark {
  width: 34px;
  height: 34px;
  border: 1px solid rgba(115, 183, 255, .45);
  border-radius: 8px;
  background: #10243d;
  box-shadow: none;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  letter-spacing: -.04em;
}

.brand-name-short {
  display: none;
}

.brand-credit {
  cursor: default;
}

.topbar-actions {
  gap: 14px;
  margin-left: auto;
}

.primary-nav {
  gap: 18px;
}

.primary-nav a,
.tool-menu a,
.tool-menu summary,
.language-switch,
.ecosystem-link {
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.primary-nav a:hover,
.tool-menu a:hover,
.ecosystem-link:hover {
  color: var(--orange);
}

.tool-menu {
  position: relative;
}

.tool-menu summary,
.language-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(17, 29, 47, .72);
  cursor: pointer;
}

.ecosystem-link {
  padding-left: 14px;
  border-left: 1px solid var(--line);
  color: var(--muted);
}

.tool-menu summary {
  gap: 8px;
  padding: 0 13px;
  list-style: none;
}

.tool-menu summary::-webkit-details-marker {
  display: none;
}

.tool-menu summary::after {
  content: "↓";
  color: var(--muted);
  font-size: 10px;
}

.tool-menu[open] summary {
  border-color: var(--orange);
  color: var(--orange);
}

.tool-menu[open] summary::after {
  content: "↑";
}

.tool-menu-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  display: grid;
  width: min(310px, calc(100vw - 32px));
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(13, 24, 40, .98);
  box-shadow: 0 22px 60px rgba(0, 5, 15, .42);
}

.tool-menu-panel a {
  padding: 12px 13px;
  border-radius: 8px;
}

.tool-menu-panel a:hover {
  background: rgba(90, 169, 255, .1);
  text-decoration: none;
}

.language-switch {
  min-width: 38px;
  padding: 0 10px;
  font-size: 11px;
}

.tool-context-bar {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 40px;
  padding: 8px max(24px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(101, 137, 180, .2);
  background: rgba(9, 19, 33, .94);
  color: var(--muted);
  font-size: 11px;
}

.tool-context-bar a {
  color: var(--muted);
  font-weight: 800;
  text-decoration: none;
}

.tool-context-bar a:hover {
  color: var(--orange);
}

.tool-context-bar strong {
  min-width: 0;
  overflow: hidden;
  color: var(--ink);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toolbox-hero {
  padding-top: 56px;
}

.toolbox-hero > .eyebrow {
  margin-bottom: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  letter-spacing: .08em;
}

.stackhal-site .toolbox-hero > h1 {
  max-width: 940px;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(40px, 5vw, 64px);
  font-weight: 760;
  line-height: 1.02;
  letter-spacing: -.045em;
}

.stackhal-site .toolbox-hero > .lede {
  max-width: 720px;
  margin: 22px 0 0;
  font-size: 18px;
}

.toolbox-status {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.toolbox-status li {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(13, 24, 40, .52);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 10px;
  text-transform: uppercase;
}

.tool-catalog {
  display: grid;
  gap: 44px;
  margin-top: 38px;
}

.tool-category-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 15px;
}

.tool-category-header h2 {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.tool-category-header::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.tool-card {
  display: grid;
  grid-template-columns: 1fr auto;
  min-height: 218px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--orange);
}

.tool-card-primary {
  background: var(--ink);
  color: white;
}

.tool-card-market {
  background: #f1e8cf;
}

.tool-card-wide {
  grid-column: 1 / -1;
  min-height: 220px;
}

.tool-number {
  color: var(--orange);
  font-size: 12px;
  font-weight: 900;
}

.tool-card h3 {
  grid-column: 1 / -1;
  margin: 28px 0 8px;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 24px;
  line-height: 1.12;
  letter-spacing: -.025em;
}

.tool-card p {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.tool-card-primary p {
  color: #c9c4b9;
}

.tool-card strong {
  grid-column: 1 / -1;
  align-self: end;
  color: var(--orange);
  font-size: 13px;
}

.toolbox-principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 72px;
}

.toolbox-principles > div {
  padding-top: 18px;
  border-top: 2px solid var(--ink);
}

.toolbox-principles b {
  color: var(--orange);
  font-size: 11px;
}

.toolbox-principles h2 {
  font-size: 18px;
}

.toolbox-principles p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

@media (max-width: 900px) {
  .primary-nav {
    display: none;
  }

  .topbar {
    padding-inline: 18px;
  }

  .brand-credit {
    display: none;
  }

  .brand-signal,
  .ecosystem-link {
    display: none;
  }

  .tool-context-bar {
    padding-inline: 18px;
  }
}

@media (max-width: 650px) {
  .topbar {
    gap: 10px;
  }

  .brand {
    gap: 7px;
  }

  .brand-name-full {
    display: none;
  }

  .brand-name-short {
    display: inline;
  }

  .topbar-actions {
    gap: 7px;
  }

  .tool-menu summary,
  .language-switch {
    min-height: 42px;
  }

  .tool-menu-panel {
    position: fixed;
    top: 68px;
    right: 12px;
  }

  .toolbox-hero {
    padding-top: 40px;
  }

  .stackhal-site .toolbox-hero > h1 {
    font-size: 40px;
  }

  .tool-grid,
  .toolbox-principles {
    grid-template-columns: 1fr;
  }

  .tool-card,
  .tool-card-wide {
    grid-column: auto;
    min-height: 200px;
  }
}