:root {
  color-scheme: dark;
  --bg: #000;
  --text: #f2f2f2;
  --muted: #8d8d8d;
  --line: #222;
  --line-strong: #3a3a3a;
  --focus: #fff;
  font-family:
    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background: var(--bg);
}

body,
button,
input {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--text);
  background: var(--bg);
  color: var(--text);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.app-shell {
  width: min(960px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0 4rem;
}

.topbar,
.section-heading,
.article-meta,
.source-toggle {
  display: flex;
  align-items: center;
}

.topbar {
  justify-content: space-between;
  gap: 1rem;
  min-height: 3rem;
  border-bottom: 1px solid var(--line);
}

h1,
h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1.2;
}

h2,
#article-count,
#feed-status {
  color: var(--muted);
}

main {
  display: grid;
  gap: 2rem;
  padding-top: 1rem;
}

.section-heading {
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
  min-height: 2rem;
  font-size: 0.85rem;
}

.source-panel {
  padding: 0.75rem;
  border: 1px solid var(--line);
}

.source-panel summary.section-heading {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
}

.source-panel summary {
  cursor: pointer;
}

.source-panel summary::before {
  content: "-";
  color: var(--muted);
}

.source-panel:not([open]) summary::before {
  content: "+";
}

.source-panel summary::-webkit-details-marker {
  display: none;
}

.source-panel:not([open]) .section-heading {
  margin-bottom: 0;
}

.source-panel:not([open]) > .source-list {
  display: none;
}

.source-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.source-toggle {
  gap: 0.35rem;
  min-height: 2rem;
  padding: 0.25rem 0.45rem;
  border: 1px solid var(--line);
  color: var(--muted);
  cursor: pointer;
}

.source-toggle:has(input:checked) {
  border-color: var(--line-strong);
  color: var(--text);
}

.source-toggle input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
}

.source-toggle svg,
.icon-button svg {
  width: 1rem;
  height: 1rem;
}

.article-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.article-row,
.empty-state {
  display: grid;
  gap: 0.45rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.article-row > a {
  line-height: 1.35;
}

.article-meta {
  flex-wrap: wrap;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

.icon-button:disabled {
  color: var(--muted);
  cursor: wait;
}

.empty-state {
  color: var(--muted);
}

button:focus-visible,
a:focus-visible,
.source-panel summary:focus-visible,
.source-toggle:focus-within {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 1rem, 960px);
  }

  .source-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}