:root {
  --bg: #09111b;
  --bg-accent: #10243a;
  --panel: rgba(7, 17, 27, 0.88);
  --panel-strong: rgba(12, 28, 42, 0.96);
  --text: #e9f6ef;
  --muted: #97b9a9;
  --line: rgba(125, 229, 182, 0.2);
  --signal: #7de5b6;
  --signal-strong: #c6ff65;
  --glow: rgba(125, 229, 182, 0.22);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius: 22px;
  --content-width: min(1120px, calc(100vw - 2rem));
  --font-ui: "Space Mono", "IBM Plex Mono", "JetBrains Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top, rgba(198, 255, 101, 0.08), transparent 28%),
    linear-gradient(180deg, #0c1825 0%, #09111b 55%, #05090f 100%);
  color: var(--text);
  font-family: var(--font-ui);
  line-height: 1.7;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(
    rgba(255, 255, 255, 0.03) 1px,
    transparent 1px
  );
  background-size: 100% 28px;
  opacity: 0.18;
}

a {
  color: inherit;
}

.site-shell {
  width: var(--content-width);
  margin: 0 auto;
  padding: 1rem 0 3rem;
}

.site-main {
  display: grid;
  gap: 1.5rem;
}

.panel {
  position: relative;
  overflow: hidden;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(16, 36, 58, 0.92), var(--panel));
  box-shadow: var(--shadow);
}

.panel::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.03);
  pointer-events: none;
}

.site-header {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  align-items: center;
  gap: 1.2rem 2rem;
  margin-bottom: 1.5rem;
  overflow: visible;
}

.nav-cluster,
.site-nav,
.language-switcher {
  display: flex;
  align-items: center;
}

.nav-cluster {
  justify-content: flex-end;
  justify-self: end;
  flex-wrap: wrap;
  gap: 0.9rem 1rem;
  min-width: 0;
}

.site-nav {
  min-width: 0;
}

.language-switcher {
  min-width: 11rem;
}

.language-menu {
  position: relative;
  width: 11rem;
  min-width: 11rem;
  z-index: 20;
}

.language-menu[open] .language-trigger {
  color: var(--text);
  border-color: var(--signal);
  background: rgba(125, 229, 182, 0.18);
  box-shadow: 0 14px 34px rgba(2, 12, 21, 0.26);
}

.language-menu[open] .language-trigger__chevron {
  transform: rotate(180deg);
}

.language-menu summary {
  list-style: none;
}

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

.language-trigger,
.language-option {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 2.85rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid rgba(125, 229, 182, 0.14);
  border-radius: 999px;
  color: #accbbb;
  text-decoration: none;
  background: linear-gradient(
    180deg,
    rgba(125, 229, 182, 0.09),
    rgba(125, 229, 182, 0.04)
  );
  cursor: pointer;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition:
    color 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

.language-trigger:hover,
.language-trigger:focus-visible,
.language-option:hover,
.language-option:focus-visible,
.language-option.is-active {
  color: var(--text);
  border-color: var(--signal);
  background: linear-gradient(
    180deg,
    rgba(125, 229, 182, 0.18),
    rgba(125, 229, 182, 0.08)
  );
  box-shadow: 0 10px 28px rgba(2, 12, 21, 0.24);
  transform: translateY(-1px);
}

.language-trigger__flag,
.language-option__flag {
  margin-right: 0.55rem;
  font-size: 1rem;
  line-height: 1;
}

.language-trigger__text,
.language-option__label {
  flex: 1;
  text-align: left;
}

.language-trigger__text {
  color: var(--text);
}

.language-trigger__chevron,
.language-option__code {
  color: #a7d7be;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: transform 180ms ease;
}

.language-option__code {
  margin-left: 0.8rem;
}

.language-list {
  position: absolute;
  top: calc(100% + 0.45rem);
  right: 0;
  z-index: 10;
  display: grid;
  gap: 0.4rem;
  margin: 0;
  min-width: 100%;
  max-height: 0;
  padding: 0;
  list-style: none;
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: 1rem;
  background: linear-gradient(
    180deg,
    rgba(9, 23, 37, 0.98),
    rgba(6, 18, 31, 0.98)
  );
  box-shadow: 0 18px 50px rgba(1, 8, 16, 0.42);
  backdrop-filter: blur(16px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-0.35rem);
  transition:
    max-height 180ms ease,
    padding 180ms ease,
    border-color 180ms ease,
    opacity 180ms ease,
    visibility 180ms ease,
    transform 180ms ease;
}

.language-menu[open] .language-list {
  max-height: 16rem;
  padding: 0.45rem;
  border-color: rgba(125, 229, 182, 0.18);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.language-list li {
  width: 100%;
}

.brand {
  display: inline-flex;
  gap: 0;
  align-items: center;
  text-decoration: none;
  font-weight: 700;
  font-size: clamp(2.2rem, 4.4vw, 3rem);
  line-height: 0.9;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.brand-prompt {
  color: #8fdcff;
  text-shadow: 0 0 18px rgba(143, 220, 255, 0.35);
}

.brand-name {
  color: var(--text);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a,
.button-link,
.text-link {
  transition:
    color 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0 1rem;
  border: 1px solid rgba(125, 229, 182, 0.1);
  border-radius: 999px;
  text-decoration: none;
  color: #accbbb;
  background: rgba(125, 229, 182, 0.05);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-list a:hover,
.nav-list a:focus-visible,
.button-link:hover,
.button-link:focus-visible,
.text-link:hover,
.text-link:focus-visible {
  color: var(--text);
  border-color: var(--signal);
  background: rgba(125, 229, 182, 0.12);
  box-shadow: 0 10px 28px rgba(2, 12, 21, 0.22);
  transform: translateY(-1px);
}

.nav-list a.is-active,
.nav-list a[aria-current="page"] {
  color: var(--bg);
  border-color: transparent;
  background: linear-gradient(135deg, var(--signal-strong), var(--signal));
  box-shadow: 0 16px 28px rgba(2, 12, 21, 0.26);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 1.5rem;
}

.hero-copy,
.intro-panel,
.article-shell,
.entry-card,
.page-header {
  backdrop-filter: blur(18px);
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--signal);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.12;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.8rem);
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.5rem);
}

h3 {
  font-size: 1.35rem;
}

p {
  margin: 0;
}

.lede {
  max-width: 44rem;
  margin-top: 1rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions,
.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
}

.hero-actions {
  margin-top: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0 1.1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(125, 229, 182, 0.08);
  color: var(--text);
  text-decoration: none;
}

.button-link-secondary {
  background: transparent;
  color: var(--muted);
}

.text-link {
  color: var(--signal-strong);
  text-decoration: none;
}

.entry-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.topic-browser,
.topic-empty-state {
  display: grid;
  gap: 1rem;
}

.topic-browser {
  margin-bottom: 1.5rem;
}

.topic-browser__header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  flex-wrap: wrap;
}

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

.topic-filter-state span {
  color: var(--signal-strong);
}

.topic-filter-bar,
.entry-card__topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.entry-card__topics {
  list-style: none;
  padding: 0;
  margin: 0;
}

.topic-filter-chip,
.topic-chip {
  display: inline-flex;
  align-items: center;
  min-height: 2.35rem;
  padding: 0 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--signal);
  text-decoration: none;
  background: rgba(125, 229, 182, 0.08);
  transition:
    color 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.topic-filter-chip:hover,
.topic-filter-chip:focus-visible,
.topic-chip:hover,
.topic-chip:focus-visible {
  color: var(--text);
  border-color: var(--signal);
  background: rgba(125, 229, 182, 0.16);
  transform: translateY(-1px);
}

.topic-filter-chip.is-active {
  color: var(--bg);
  border-color: transparent;
  background: linear-gradient(135deg, var(--signal-strong), var(--signal));
  box-shadow: 0 16px 28px rgba(2, 12, 21, 0.24);
}

.entry-card,
.intro-panel,
.article-shell {
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.entry-card p:not(.eyebrow) {
  color: var(--muted);
}

.entry-card__topics {
  margin-top: 0.2rem;
}

.prose-flow {
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.prose-flow p,
.prose-flow li {
  max-width: 68ch;
}

.prose-flow img {
  display: block;
  max-width: 100%;
  height: auto;
}

.prose-flow pre,
.prose-flow .highlight {
  max-width: 100%;
  overflow-x: auto;
}

.prose-flow :not(pre) > code {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.prose-flow h2,
.prose-flow h3 {
  margin-top: 0.5rem;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.tag-row li {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--signal);
  background: rgba(125, 229, 182, 0.08);
}

.site-footer {
  margin-top: 1.5rem;
  padding: 0 0.25rem;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 860px) {
  .hero-grid,
  .entry-grid {
    grid-template-columns: 1fr;
  }

  .site-header {
    grid-template-columns: 1fr;
  }

  .section-heading,
  .nav-cluster {
    align-items: start;
    flex-direction: column;
  }

  .nav-cluster {
    justify-self: stretch;
    width: 100%;
  }

  .site-nav,
  .language-switcher {
    width: 100%;
  }

  .nav-list {
    justify-content: flex-start;
  }

  .site-shell {
    padding-top: 0.75rem;
  }

  .panel {
    padding: 1.2rem;
  }

  .language-menu,
  .language-list {
    width: 100%;
  }

  .language-list {
    position: static;
  }

  .language-menu[open] .language-list {
    margin-top: 0.45rem;
  }
}

@media (max-width: 540px) {
  :root {
    --content-width: min(1120px, calc(100vw - 1rem));
  }

  h1 {
    font-size: 2.2rem;
  }

  .nav-list {
    width: 100%;
  }

  .nav-cluster {
    gap: 0.75rem;
  }

  .nav-list li,
  .nav-list a,
  .button-link,
  .language-list li,
  .language-trigger,
  .language-option {
    width: 100%;
  }
}