:root {
  --bg: #f7f8f9;
  --rail: #eef1f3;
  --surface: #ffffff;
  --line: #cbd2d8;
  --text: #171b1f;
  --muted: #5f6b75;
  --accent: #006f94;
  --accent-contrast: #ffffff;
  --green: #18794e;
  --orange: #925f00;
  --danger: #b42335;
  --notes: #3f4952;
  color-scheme: light;
  color: var(--text);
  background: var(--bg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0f12;
    --rail: #101419;
    --surface: #151a20;
    --line: #2a3139;
    --text: #e8edf2;
    --muted: #8f9aa6;
    --accent: #78c7ed;
    --accent-contrast: #071014;
    --green: #74c991;
    --orange: #e6b566;
    --danger: #ef7b85;
    --notes: #c9d1d9;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--bg); }
body { margin: 0; min-height: 100vh; background: var(--bg); }
a { color: var(--accent); text-underline-offset: .2em; }
button, input { font: inherit; }
code { overflow-wrap: anywhere; font-family: inherit; }

.app-shell {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  min-height: 100vh;
}

.site-rail {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 2rem 1.5rem;
  border-right: 1px solid var(--line);
  background: var(--rail);
}

.brand {
  color: var(--text);
  font-size: .95rem;
  font-weight: 700;
  text-decoration: none;
}
.brand span { color: var(--accent); }

.site-rail nav {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  margin-top: 3rem;
}
.site-rail nav a,
.rail-footer button {
  border: 0;
  padding: .5rem 0;
  background: none;
  color: var(--muted);
  font: inherit;
  font-size: .875rem;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}
.site-rail nav a:hover,
.rail-footer button:hover { color: var(--text); }
.site-rail nav a[aria-current="page"] { color: var(--accent); }
.rail-nav-group,
.rail-subnav { display: grid; }
.rail-subnav {
  margin-left: .15rem;
  padding-left: .8rem;
  border-left: 1px solid var(--line);
}
.site-rail nav .rail-subnav a { padding: .35rem 0; font-size: .75rem; }
.rail-footer { display: grid; gap: .15rem; margin: auto 0 0; }
.rail-footer form { margin: 0; }

main {
  width: min(100%, 66rem);
  margin: 0 auto;
  padding: 4.5rem clamp(2rem, 6vw, 5rem) 6rem;
}

.hero {
  padding: 0 0 3.5rem;
  border-bottom: 1px solid var(--line);
}
.hero h1,
.page-heading h1,
.login-panel h1 {
  margin: .65rem 0 1rem;
  font-size: clamp(2.25rem, 6vw, 4.75rem);
  line-height: 1;
  letter-spacing: -.07em;
}
.hero > p:last-child,
.page-heading > p:last-child {
  max-width: 46rem;
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
}
.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.catalog-section,
.channel-section { margin-top: 3.5rem; }
.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--line);
}
.section-heading h2 { margin: .35rem 0 0; font-size: 1.35rem; }
.catalog-list,
.release-list { display: grid; }
.catalog-item {
  display: grid;
  grid-template-columns: 3.25rem minmax(12rem, 1fr) minmax(15rem, 1.2fr) auto;
  gap: 1.25rem;
  align-items: center;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}
.catalog-copy h3 { margin: .3rem 0 0; font-size: 1.1rem; }
.product-icon,
.app-icon {
  width: 3.25rem;
  height: 3.25rem;
  border: 1px solid var(--line);
  border-radius: .3rem;
  background: var(--surface);
}
.product-icon { display: grid; place-items: center; color: var(--accent); font-weight: 700; }
.app-icon { object-fit: cover; }
.app-icon-large { width: 4.5rem; height: 4.5rem; flex: 0 0 auto; }
.channel-summary { display: grid; gap: .55rem; }
.channel-summary > div {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: .25rem .75rem;
  align-items: baseline;
}
.channel-summary small { grid-column: 2; color: var(--muted); font-size: .75rem; }
.channel {
  width: fit-content;
  color: var(--muted);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.channel-stable { color: var(--green); }
.channel-beta { color: var(--orange); }
.row-action { white-space: nowrap; font-size: .82rem; }
.muted { color: var(--muted); }

.empty-state {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.empty-state h3 { margin: 0 0 .5rem; color: var(--text); font-size: 1rem; }
.empty-state p { margin: 0; line-height: 1.6; }
.empty-state.compact { padding: 1.25rem 0; }
.catalog-footer {
  display: flex;
  gap: .6rem;
  margin-top: 4.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: .55rem .8rem;
  border: 1px solid var(--accent);
  border-radius: .15rem;
  background: var(--accent);
  color: var(--accent-contrast);
  font: inherit;
  font-size: .82rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.button:disabled { opacity: .4; cursor: not-allowed; }
.button-secondary { border-color: var(--line); background: transparent; color: var(--text); }
.button-danger { border-color: var(--danger); background: transparent; color: var(--danger); }
.button:focus-visible,
a:focus-visible,
input:focus-visible,
button:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; }

.page-heading { padding-bottom: 2rem; border-bottom: 1px solid var(--line); }
.page-heading h1 { font-size: clamp(2rem, 5vw, 4rem); }
.back-link { display: inline-block; margin-bottom: 2.5rem; color: var(--muted); font-size: .82rem; text-decoration: none; }
.app-identity { display: flex; align-items: center; gap: 1.25rem; }
.app-identity h1 { margin-bottom: .55rem; }
.manager-toolbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 2.5rem 0;
  padding: .8rem 0;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.manager-toolbar[hidden] { display: none; }
.select-release input { width: 1rem; height: 1rem; accent-color: var(--accent); }
.release-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: start;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--line);
}
.release-title { display: flex; align-items: baseline; flex-wrap: wrap; gap: .65rem; }
.release-title h3 { margin: 0; font-size: 1.15rem; }
.release-title h3 small { color: var(--muted); font-size: .75em; font-weight: 400; }
.current-badge { color: var(--green); font-size: .68rem; font-weight: 700; text-transform: uppercase; }
.release-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0;
  color: var(--muted);
}
.release-meta div { min-width: 0; }
.release-meta dt { margin-bottom: .3rem; font-size: .65rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.release-meta dd { margin: 0; overflow-wrap: anywhere; font-size: .78rem; }
.relative-time { color: var(--muted); white-space: nowrap; }
.release-notes { max-width: 48rem; color: var(--notes); font-size: .9rem; line-height: 1.65; }
.release-notes > :first-child { margin-top: 0; }
.release-notes > :last-child { margin-bottom: 0; }
.pagination { display: flex; align-items: center; justify-content: center; gap: 1rem; margin-top: 2rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.login-page { display: grid; min-height: 100vh; place-items: center; }
.login-shell { width: min(100%, 42rem); padding: 2rem; }
.login-panel { padding-top: 1.25rem; border-top: 1px solid var(--line); }
.login-panel h1 { font-size: clamp(2.25rem, 8vw, 4.75rem); }
.login-panel form { display: grid; gap: .75rem; margin-top: 2rem; }
.login-panel label { font-size: .78rem; font-weight: 700; text-transform: uppercase; }
.login-panel input {
  width: 100%;
  padding: .8rem;
  border: 1px solid var(--line);
  border-radius: .15rem;
  background: var(--surface);
  color: var(--text);
}
.login-panel .button { width: fit-content; margin-top: .25rem; }
.agent-discovery {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.6;
}
.agent-discovery h2 { margin: 0 0 1rem; color: var(--text); font-size: 1rem; }
.agent-discovery p { margin: .6rem 0; }
.agent-discovery pre {
  margin: .75rem 0;
  padding: .75rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
}

@media (max-width: 860px) {
  .app-shell { display: block; }
  .site-rail {
    z-index: 5;
    flex-direction: row;
    align-items: center;
    gap: 1.5rem;
    width: 100%;
    height: auto;
    padding: 1rem 1.25rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .site-rail nav { flex: 1; flex-direction: row; align-items: baseline; gap: 1rem; margin: 0; }
  .rail-nav-group,
  .rail-subnav { display: flex; align-items: baseline; gap: 1rem; }
  .rail-subnav { margin: 0; padding: 0; border: 0; }
  .rail-footer { margin: 0; }
  main { padding: 3rem 1.5rem 5rem; }
  .catalog-item { grid-template-columns: 3.25rem minmax(0, 1fr) auto; }
  .catalog-item .channel-summary { grid-column: 2 / -1; }
  .release-meta { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 580px) {
  .site-rail { align-items: flex-start; flex-wrap: wrap; gap: .6rem 1rem; }
  .site-rail nav { order: 3; flex: 1 0 100%; overflow-x: auto; }
  .site-rail nav a { white-space: nowrap; }
  .rail-footer { margin-left: auto; }
  main { padding: 2.25rem 1rem 4rem; }
  .hero { padding-bottom: 2.5rem; }
  .hero h1 { font-size: 2.4rem; }
  .catalog-section, .channel-section { margin-top: 2.75rem; }
  .catalog-item { grid-template-columns: 2.75rem minmax(0, 1fr); gap: 1rem; }
  .product-icon, .app-icon { width: 2.75rem; height: 2.75rem; }
  .catalog-item .channel-summary { grid-column: 1 / -1; }
  .catalog-item .row-action { grid-column: 2; }
  .section-heading { align-items: start; }
  .manager-toolbar { position: static; align-items: stretch; flex-direction: column; }
  .release-row { grid-template-columns: auto minmax(0, 1fr); }
  .release-row > .button { grid-column: 2; width: fit-content; }
  .release-meta { grid-template-columns: 1fr; gap: .75rem; }
  .app-identity { align-items: flex-start; }
  .app-icon-large { width: 3.5rem; height: 3.5rem; }
}