/* Оформление сайта документации flang.
   Шрифты системные намеренно: сайт обязан собираться и открываться без сети. */

:root {
  --ground:    #F5F6F9;
  --surface:   #FFFFFF;
  --sidebar:   #F0F2F6;
  --ink:       #14181F;
  --muted:     #5B6373;
  --faint:     #858D9C;
  --rule:      #DCE0E8;
  --rule-soft: #E9ECF1;
  --accent:    #2B4C8C;
  --accent-bg: #E8EDF7;
  --code-bg:   #EFF1F5;
  --quote-bar: #C3CBDA;

  --serif: ui-serif, Georgia, "Noto Serif", "Liberation Serif", "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "DejaVu Sans", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", "DejaVu Sans Mono", Consolas, monospace;

  --side-w: 264px;
  --toc-w: 220px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:    #11141B;
    --surface:   #171B23;
    --sidebar:   #141821;
    --ink:       #E3E7EE;
    --muted:     #98A1B2;
    --faint:     #757E90;
    --rule:      #262C38;
    --rule-soft: #1E232D;
    --accent:    #8FADE9;
    --accent-bg: #1B2231;
    --code-bg:   #1C212B;
    --quote-bar: #303849;
  }
}

:root[data-theme="dark"] {
  --ground:    #11141B;
  --surface:   #171B23;
  --sidebar:   #141821;
  --ink:       #E3E7EE;
  --muted:     #98A1B2;
  --faint:     #757E90;
  --rule:      #262C38;
  --rule-soft: #1E232D;
  --accent:    #8FADE9;
  --accent-bg: #1B2231;
  --code-bg:   #1C212B;
  --quote-bar: #303849;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: absolute; left: -9999px;
  background: var(--accent); color: #fff; padding: .6rem 1rem; z-index: 10;
}
.skip:focus { left: 1rem; top: .6rem; }

/* ── Шапка ─────────────────────────────────────────────────────────── */

.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: baseline; gap: 1rem;
  padding: .85rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
}

.brand {
  font-family: var(--mono);
  font-size: 1.05rem; font-weight: 700;
  color: var(--ink); text-decoration: none;
  letter-spacing: -.01em;
}

.tagline { color: var(--faint); font-size: .85rem; flex: 1; }

.theme {
  background: none; border: 1px solid var(--rule); color: var(--muted);
  border-radius: 3px; cursor: pointer; padding: .15rem .5rem; font-size: .9rem;
  align-self: center;
}
.theme:hover { background: var(--accent-bg); color: var(--accent); }

/* ── Каркас ────────────────────────────────────────────────────────── */

.shell {
  display: grid;
  grid-template-columns: var(--side-w) minmax(0, 1fr) var(--toc-w);
  gap: 0;
  max-width: 1400px;
  margin: 0 auto;
  align-items: start;
}

.side {
  position: sticky; top: 53px;
  max-height: calc(100vh - 53px);
  overflow-y: auto;
  padding: 1.6rem 1.2rem 3rem;
  background: var(--sidebar);
  border-right: 1px solid var(--rule);
  font-size: .89rem;
}

.nav-group { margin-bottom: 1.4rem; }
.nav-title {
  font-size: .68rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--faint); font-weight: 700; margin-bottom: .45rem;
}
.side ul { list-style: none; margin: 0; padding: 0; }
.side li { margin: 0; }
.side a {
  display: block; padding: .26rem .5rem; margin-left: -.5rem;
  color: var(--muted); text-decoration: none; border-radius: 3px;
  line-height: 1.4;
}
.side a:hover { background: var(--accent-bg); color: var(--accent); }
.side a.here { background: var(--accent-bg); color: var(--accent); font-weight: 600; }
.nav-count { color: var(--faint); font-size: .8rem; padding: .26rem 0; font-style: italic; }

/* ── Содержание ────────────────────────────────────────────────────── */

.content {
  padding: 2.5rem 3rem 6rem;
  min-width: 0;
  max-width: 78ch;
}

.content h1 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  line-height: 1.15; font-weight: 600; letter-spacing: -.015em;
  text-wrap: balance;
  margin: 0 0 1.4rem;
}

.content h2 {
  font-family: var(--serif);
  font-size: 1.5rem; line-height: 1.25; font-weight: 600;
  text-wrap: balance;
  margin: 2.8rem 0 .8rem;
  padding-top: .6rem;
  border-top: 1px solid var(--rule-soft);
}

.content h3 {
  font-size: 1.05rem; font-weight: 700; margin: 1.9rem 0 .5rem;
}

.content h4, .content h5, .content h6 {
  font-size: .95rem; font-weight: 700; color: var(--muted);
  margin: 1.4rem 0 .4rem;
}

.content p { margin: 0 0 1rem; }
.content strong { font-weight: 650; }

.content a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
.content a.zettel { font-family: var(--mono); font-size: .88em; }

.content ul, .content ol { margin: 0 0 1rem; padding-left: 1.4rem; }
.content li { margin-bottom: .4rem; }
.content li > ul, .content li > ol { margin-top: .4rem; }

.content code {
  font-family: var(--mono); font-size: .87em;
  background: var(--code-bg); padding: .1em .35em; border-radius: 2px;
}

.content pre {
  background: var(--code-bg);
  border-left: 2px solid var(--rule);
  padding: 1rem 1.1rem;
  margin: 0 0 1.3rem;
  overflow-x: auto;
}
.content pre code {
  background: none; padding: 0;
  font-size: .82rem; line-height: 1.6; white-space: pre;
}

.content blockquote {
  margin: 0 0 1.3rem;
  padding: .2rem 0 .2rem 1.1rem;
  border-left: 3px solid var(--quote-bar);
  color: var(--muted);
}
.content blockquote p:last-child { margin-bottom: 0; }

.content hr { border: none; border-top: 1px solid var(--rule); margin: 2.2rem 0; }

.tw { overflow-x: auto; margin: 0 0 1.3rem; }
.content table {
  border-collapse: collapse; width: 100%;
  font-size: .9rem; background: var(--surface);
}
.content th, .content td {
  text-align: left; padding: .55rem .8rem;
  border-bottom: 1px solid var(--rule-soft); vertical-align: top;
}
.content th {
  font-size: .68rem; letter-spacing: .09em; text-transform: uppercase;
  color: var(--faint); font-weight: 700;
  border-bottom: 1px solid var(--rule); white-space: nowrap;
}
.content tbody tr:last-child td { border-bottom: none; }
.content .ta-right { text-align: right; font-variant-numeric: tabular-nums; }
.content .ta-center { text-align: center; }

/* ── Оглавление справа ─────────────────────────────────────────────── */

.toc {
  position: sticky; top: 53px;
  max-height: calc(100vh - 53px); overflow-y: auto;
  padding: 2.6rem 1.2rem 3rem 0;
  font-size: .82rem;
}
.toc-title {
  font-size: .66rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--faint); font-weight: 700; margin-bottom: .5rem;
}
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule); }
.toc li { margin: 0; }
.toc a {
  display: block; padding: .2rem .7rem; color: var(--muted);
  text-decoration: none; line-height: 1.35;
}
.toc a:hover { color: var(--accent); }
.toc .lvl3 a { padding-left: 1.4rem; font-size: .95em; }

/* ── Подвал ────────────────────────────────────────────────────────── */

.bottom {
  border-top: 1px solid var(--rule);
  padding: 1.6rem 1.5rem 3rem;
  color: var(--faint); font-size: .84rem;
  max-width: 1400px; margin: 0 auto;
}
.bottom code { font-family: var(--mono); font-size: .92em; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

@media (max-width: 1100px) {
  .shell { grid-template-columns: var(--side-w) minmax(0, 1fr); }
  .toc { display: none; }
  .content { padding: 2.2rem 2rem 5rem; }
}

@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; }
  .side {
    position: static; max-height: none; border-right: none;
    border-bottom: 1px solid var(--rule); padding: 1rem 1.2rem;
  }
  .content { padding: 1.8rem 1.2rem 4rem; }
  .tagline { display: none; }
}