:root {
  --bg: #09110d;
  --bg-soft: #0f1813;
  --panel: rgba(11, 22, 17, 0.9);
  --line: rgba(126, 217, 145, 0.24);
  --text: #d6e8d9;
  --muted: #8fa898;
  --accent: #8ee887;
  --accent-strong: #c3ff9d;
  --warning: #ffcc7a;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  --font: "IBM Plex Mono", "Fira Code", "JetBrains Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top, rgba(99, 193, 111, 0.12), transparent 28%),
    linear-gradient(180deg, #07100c 0%, #08120e 100%);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
}

a {
  color: inherit;
}

.shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.brand {
  color: var(--accent-strong);
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-sub {
  margin: 8px 0 0;
  color: var(--muted);
  max-width: 64ch;
}

.topbar-actions,
.lang-toggle {
  display: flex;
  align-items: center;
}

.lang-toggle {
  border: 1px solid var(--line);
  background: rgba(10, 21, 15, 0.95);
  color: var(--accent-strong);
  font: inherit;
  padding: 10px 14px;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
}

.sidebar,
.content,
.single-column {
  display: grid;
  gap: 24px;
}

.single-column {
  max-width: 920px;
}

.panel {
  position: relative;
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(195, 255, 157, 0.05);
  pointer-events: none;
}

.panel-title,
.prompt,
.article-date,
.article-meta {
  color: var(--muted);
}

.panel-title,
.prompt {
  margin: 0 0 16px;
  font-size: 0.95rem;
}

.hero h1,
.article-page h1 {
  margin: 0 0 16px;
  color: var(--accent-strong);
  line-height: 1.25;
}

.article-page h2 {
  margin-top: 28px;
  color: var(--warning);
  font-size: 1.05rem;
}

.nav-list,
.meta-list,
.plain-list,
.article-list,
.note-list {
  display: grid;
  gap: 12px;
}

.nav-list a,
.text-link {
  color: var(--accent);
  text-decoration: none;
}

.nav-list a:hover,
.text-link:hover,
.article-card:hover {
  text-decoration: underline;
}

.meta-list,
.plain-list {
  margin: 0;
  padding-left: 18px;
}

.hero-actions,
.filter-row,
.footer-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.button,
.filter-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  padding: 10px 14px;
  color: var(--accent-strong);
  text-decoration: none;
  background: rgba(16, 30, 22, 0.92);
  font: inherit;
  cursor: pointer;
}

.button-secondary {
  color: var(--text);
}

.filter-button.is-active {
  border-color: rgba(195, 255, 157, 0.5);
  color: var(--accent-strong);
}

.grid-two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.tag-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  border: 1px solid var(--line);
  padding: 6px 10px;
  color: var(--accent);
}

.article-card,
.note-card {
  display: grid;
  gap: 8px;
  border: 1px solid var(--line);
  padding: 16px;
  text-decoration: none;
  background: rgba(12, 23, 18, 0.82);
}

.nested-panel {
  margin-top: 28px;
  background: rgba(10, 20, 15, 0.72);
  box-shadow: none;
}

.compact-list .article-card {
  padding: 12px 14px;
}

.article-card strong {
  color: var(--text);
  font-size: 1.03rem;
}

.note-card p,
.article-page p,
.hero p {
  margin: 0;
}

.lang {
  display: none;
}

html[data-lang="en"] .lang-en,
html[data-lang="ru"] .lang-ru {
  display: inline;
}

html[data-lang="en"] .lang-en.block,
html[data-lang="ru"] .lang-ru.block {
  display: block;
}

.note-card.is-hidden {
  display: none;
}

@media (max-width: 900px) {
  .layout,
  .grid-two {
    grid-template-columns: 1fr;
  }

  .shell {
    padding: 16px;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }
}