:root {
  --bg: #f4f4f4;
  --surface: #ffffff;
  --ink: #161616;
  --muted: #525252;
  --line: #dcdcdc;
  --line-strong: #c6c6c6;
  --accent: #0f62fe;
  --accent-soft: #edf4ff;
  --max: 1220px;
}

:root[data-theme="dark"] {
  --bg: #161616;
  --surface: #262626;
  --ink: #f4f4f4;
  --muted: #c6c6c6;
  --line: #393939;
  --line-strong: #525252;
  --accent: #78a9ff;
  --accent-soft: #1f2b46;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "IBM Plex Sans", "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: #000;
  color: #fff;
  padding: 0.5rem 0.75rem;
  z-index: 999;
}

.skip-link:focus {
  top: 0;
}

.site-header,
.site-footer,
.hero-inner,
.flow-layout {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  padding-top: 0.8rem;
}

.header-inner {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 0.8rem;
}

.brand {
  color: inherit;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
}

.brand-text {
  font-weight: 600;
}

.site-nav {
  display: flex;
  gap: 0.4rem;
}

.nav-link {
  text-decoration: none;
  color: inherit;
  padding: 0.45rem 0.6rem;
  border-radius: 4px;
  border: 1px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  border-color: var(--line);
}

.site-main {
  padding: 1rem 0 2rem;
}

.hero {
  margin-bottom: 1rem;
}

.hero-inner {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.2rem;
  display: grid;
  grid-template-columns: 1fr minmax(260px, 330px);
  gap: 1rem;
  align-items: start;
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-weight: 600;
  font-size: 0.75rem;
}

.hero h1 {
  margin: 0.45rem 0 0;
  line-height: 1.1;
  font-weight: 500;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.hero-copy {
  margin: 0.7rem 0 0;
  color: var(--muted);
}

.hero-controls {
  display: grid;
  gap: 0.5rem;
}

.search-label {
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.post-search {
  width: 100%;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: inherit;
  border-radius: 4px;
  padding: 0.6rem 0.65rem;
  font: inherit;
}

.theme-toggle {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: inherit;
  border-radius: 4px;
  padding: 0.55rem 0.65rem;
  font: inherit;
  cursor: pointer;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: var(--accent);
}

.flow-layout {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 1rem;
}

.filter-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.9rem;
  position: sticky;
  top: 0.8rem;
  align-self: start;
}

.panel-block + .panel-block {
  margin-top: 1rem;
}

.panel-title {
  margin: 0 0 0.55rem;
  font-size: 0.86rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.filter-chip {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: inherit;
  border-radius: 999px;
  padding: 0.3rem 0.65rem;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}

.filter-chip:hover,
.filter-chip:focus-visible {
  border-color: var(--accent);
}

.filter-chip.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.flow-wrap {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.75rem 1rem 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.section-head h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.results-count {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.post-feed {
  display: flex;
  flex-direction: column;
}

.post-card {
  padding: 1rem 0 1.2rem;
  border-top: 1px solid var(--line);
}

.post-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
}

.post-category {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  border-radius: 999px;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.22rem 0.58rem;
}

.post-card-title {
  margin: 0.55rem 0 0;
  line-height: 1.2;
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  font-weight: 500;
}

.post-card-date {
  margin: 0;
  font-size: 0.84rem;
  color: var(--muted);
  white-space: nowrap;
}

.post-card-content {
  margin-top: 0.78rem;
}

.post-card-content h1,
.post-card-content h2,
.post-card-content h3 {
  line-height: 1.2;
}

.post-card-content a {
  color: var(--accent);
}

.post-card-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

.feed-sentinel {
  min-height: 36px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.4rem 0 0.9rem;
}

.feed-sentinel.done {
  color: var(--muted);
}

.placeholder,
.error {
  color: var(--muted);
}

.error {
  color: #da1e28;
}

.site-footer {
  padding: 1rem 0 2rem;
}

.footer-inner {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding-top: 0.9rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.9rem;
}

.footer-copy,
.footer-note {
  margin: 0;
}

@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .flow-layout {
    grid-template-columns: 1fr;
  }

  .filter-panel {
    position: static;
  }
}

@media (max-width: 700px) {
  .site-header,
  .site-footer,
  .hero-inner,
  .flow-layout,
  .footer-inner {
    width: min(var(--max), calc(100% - 1rem));
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .site-nav {
    width: 100%;
  }

  .nav-link {
    flex: 1;
    text-align: center;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .post-topline {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
  }

  .footer-inner {
    flex-direction: column;
  }
}