/* ============================================================
   BXF Blog — sdílený stylesheet pro /blog/ a /en/blog/
   Design tokeny a chrome zrcadlí index.html (single source: homepage).
   ============================================================ */

/* Fonty — self-hosted, shodné s homepage */
@font-face { font-family: 'Inter Tight'; font-style: normal; font-weight: 400; font-display: swap; src: url('/fonts/inter-tight-v9-latin_latin-ext-regular.woff2') format('woff2'); }
@font-face { font-family: 'Inter Tight'; font-style: normal; font-weight: 500; font-display: swap; src: url('/fonts/inter-tight-v9-latin_latin-ext-500.woff2') format('woff2'); }
@font-face { font-family: 'Inter Tight'; font-style: normal; font-weight: 600; font-display: swap; src: url('/fonts/inter-tight-v9-latin_latin-ext-600.woff2') format('woff2'); }
@font-face { font-family: 'Inter Tight'; font-style: normal; font-weight: 700; font-display: swap; src: url('/fonts/inter-tight-v9-latin_latin-ext-700.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url('/fonts/jetbrains-mono-v24-latin_latin-ext-regular.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url('/fonts/jetbrains-mono-v24-latin_latin-ext-500.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 600; font-display: swap; src: url('/fonts/jetbrains-mono-v24-latin_latin-ext-600.woff2') format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 700; font-display: swap; src: url('/fonts/jetbrains-mono-v24-latin_latin-ext-700.woff2') format('woff2'); }
@font-face { font-family: 'Archivo Black'; font-style: normal; font-weight: 400; font-display: swap; src: url('/fonts/archivo-black-v23-latin_latin-ext-regular.woff2') format('woff2'); }

:root {
  --color-brand-bg:        #0b0d11;
  --color-brand-bg-2:      #0f1218;
  --color-brand-bg-3:      #161a22;
  --color-brand-line:      #1f242e;
  --color-brand-line-2:    #2a2f3a;
  --color-brand-line-3:    #3a4150;
  --color-brand-fg:        #f6f4f0;
  --color-brand-muted:     #9aa0ab;
  --color-brand-muted-2:   #6a707b;
  --color-brand-muted-3:   #4a505a;
  --color-brand-amber:     #f5a623;
  --color-brand-amber-hover: #ffba3d;
  --color-brand-amber-soft:  #e07a1f;
  --color-brand-amber-bright:#ffcc70;
  --color-brand-positive:  #4ade80;
  --color-brand-negative:  #f87171;
  --color-brand-info:      #67e8f9;
  --color-brand-wf:        #c084fc;

  --font-brand:   'Inter Tight', ui-sans-serif, system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-display: 'Archivo Black', 'Inter Tight', ui-sans-serif, sans-serif;

  --section-padding: clamp(4.5rem, 9vw, 8rem);
  --content-max: 1200px;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  background: var(--color-brand-bg);
  color: var(--color-brand-fg);
  font-family: var(--font-brand);
  font-size: 16px;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; height: auto; }
ul, ol { list-style: none; }
::selection { background: var(--color-brand-amber); color: #0b0d11; }

.container { max-width: var(--content-max); margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 2.5rem); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@keyframes meta-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.55); }
  70%  { box-shadow: 0 0 0 8px rgba(74, 222, 128, 0); }
  100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0); }
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.45; transform: scale(0.8); }
}

/* Reveal */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-d1 { transition-delay: 0.08s; }
.reveal-d2 { transition-delay: 0.16s; }

/* ============================================================
   Telemetry bar
   ============================================================ */
.telemetry-bar {
  position: relative;
  background: var(--color-brand-bg-2);
  border-bottom: 1px solid var(--color-brand-line);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-brand-muted-2);
}
.telemetry-inner {
  display: flex; align-items: center; flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.4rem 1rem;
  padding: 0.55rem 1.5rem;
  max-width: var(--content-max);
  margin: 0 auto;
  line-height: 1;
}
.telemetry-bar .item { display: inline-flex; align-items: center; gap: 0.55rem; }
.telemetry-bar .sep { color: var(--color-brand-line-3); }
.telemetry-bar .v { color: var(--color-brand-fg); }
.telemetry-bar .positive { color: var(--color-brand-positive); }
.telemetry-bar .pulse {
  display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-brand-positive);
  box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.55);
  animation: meta-pulse 1.8s ease-out infinite;
}
#liveClock { font-variant-numeric: tabular-nums; color: var(--color-brand-fg); letter-spacing: 0.12em; }
.telemetry-bar .tz { color: var(--color-brand-muted-2); }
@media (max-width: 640px) {
  .telemetry-bar { font-size: 0.58rem; letter-spacing: 0.16em; }
  .telemetry-inner { padding: 0.5rem 1rem; gap: 0.4rem 0.85rem; }
}

/* ============================================================
   Top nav
   ============================================================ */
.page-header { display: contents; }
.topnav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--color-brand-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-brand-line);
}
.topnav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px; gap: 1.5rem;
}
.topnav-brand {
  display: inline-flex; align-items: center; gap: 0.55rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
.topnav-brand .mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px;
  background: var(--color-brand-amber);
  color: #ffffff;
  font-family: var(--font-display);
  font-size: 0.56rem;
  letter-spacing: 0.01em;
}
.topnav-brand .accent { color: var(--color-brand-amber); }
.topnav-links {
  display: flex; align-items: center; gap: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-brand-muted);
}
.topnav-links a { transition: color 160ms; color: var(--color-brand-muted); }
.topnav-links a:hover { color: var(--color-brand-amber); }
.topnav-links a.active { color: var(--color-brand-amber); }
.topnav-cta {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--color-brand-line-2);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-brand-fg);
  border-radius: 4px;
  transition: all 160ms;
}
.topnav-cta:hover {
  border-color: var(--color-brand-amber);
  color: var(--color-brand-amber);
  background: color-mix(in oklab, var(--color-brand-amber) 8%, transparent);
}
.topnav-cta .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-brand-positive); box-shadow: 0 0 6px var(--color-brand-positive); animation: pulse-dot 2.4s ease-in-out infinite; }
.topnav-actions { display: flex; align-items: center; gap: 1.1rem; }
.lang-switch {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.12em;
}
.lang-switch a { padding: 0.1rem 0.15rem; color: var(--color-brand-muted-2); transition: color 160ms; }
.lang-switch a:hover { color: var(--color-brand-fg); }
.lang-switch a.active { color: var(--color-brand-amber); }
.lang-switch .sep { color: var(--color-brand-line-3); }
@media (max-width: 760px) { .topnav-links { display: none; } }
@media (max-width: 460px) { .topnav-cta { display: none; } }

/* ============================================================
   Section scaffolding (shodné s homepage)
   ============================================================ */
.section { padding: var(--section-padding) 0; position: relative; }
.section-divider {
  display: flex; align-items: center; gap: 1.1rem;
  margin: 0 0 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-brand-muted-3);
}
.section-divider .label { display: inline-flex; align-items: center; gap: 0.45rem; }
.section-divider .label .num { color: var(--color-brand-amber); font-weight: 700; letter-spacing: 0.04em; }
.section-divider .label .text { color: var(--color-brand-muted-2); }
.section-divider hr { flex: 1; border: none; border-top: 1px solid var(--color-brand-line); margin: 0; }
.section-divider .tail { color: var(--color-brand-muted-3); font-size: 0.55rem; letter-spacing: 0.22em; }
.section-head { margin: 0 auto 3rem; max-width: 860px; }
.section-head .micro {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-brand-amber);
  margin-bottom: 0.85rem;
  display: inline-flex; align-items: center; gap: 0.6rem;
}
.section-head .micro::before { content: ''; width: 22px; height: 1px; background: var(--color-brand-amber); }
.section-head h1, .section-head h2 {
  font-family: var(--font-brand);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--color-brand-fg);
  margin-bottom: 0.85rem;
}
.section-head h1 em, .section-head h2 em { font-style: italic; font-weight: 500; color: var(--color-brand-amber); }
.section-head p { font-size: 1rem; color: var(--color-brand-muted); line-height: 1.65; max-width: 600px; }

/* ============================================================
   Blog — výpis článků
   ============================================================ */
.post-list {
  display: grid;
  gap: 1px;
  background: var(--color-brand-line);
  border: 1px solid var(--color-brand-line);
  border-radius: 7px;
  overflow: hidden;
  max-width: 860px;
  margin-inline: auto;
}
.post-card {
  position: relative;
  display: block;
  background: var(--color-brand-bg-2);
  padding: 1.5rem 1.6rem 1.6rem;
  transition: background 280ms var(--ease-out-expo);
}
.post-card::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--color-brand-amber);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 420ms var(--ease-out-expo);
}
.post-card:hover { background: var(--color-brand-bg-3); }
.post-card:hover::before { transform: scaleY(1); transform-origin: top; }
.post-card .meta {
  display: flex; align-items: baseline; gap: 0.9rem; flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-bottom: 0.7rem;
}
.post-card .meta .tag { color: var(--color-brand-amber); font-weight: 600; }
.post-card .meta .date { color: var(--color-brand-muted-2); }
.post-card h2 {
  font-family: var(--font-brand);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--color-brand-fg);
  margin-bottom: 0.55rem;
  transition: color 280ms var(--ease-out-expo);
}
.post-card:hover h2 { color: var(--color-brand-amber); }
.post-card p { font-size: 0.9rem; color: var(--color-brand-muted); line-height: 1.65; max-width: 640px; }
.post-card .more {
  display: inline-block;
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-brand-amber);
  font-weight: 600;
}

/* ============================================================
   Blog — stránka článku
   ============================================================ */
.post { max-width: 760px; margin-inline: auto; }
.post-back {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-brand-muted-2);
  margin-bottom: 2.25rem;
  transition: color 160ms;
}
.post-back:hover { color: var(--color-brand-amber); }
.post-kicker {
  display: flex; align-items: baseline; gap: 0.9rem; flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.post-kicker .tag { color: var(--color-brand-amber); font-weight: 600; display: inline-flex; align-items: center; gap: 0.6rem; }
.post-kicker .tag::before { content: ''; width: 22px; height: 1px; background: var(--color-brand-amber); }
.post-kicker .date { color: var(--color-brand-muted-2); }
.post h1 {
  font-family: var(--font-brand);
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.12;
  color: var(--color-brand-fg);
  margin-bottom: 1rem;
}
.post h1 em { font-style: italic; font-weight: 500; color: var(--color-brand-amber); }
.post-byline {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--color-brand-muted-2);
  margin-bottom: 2.25rem;
}
.post-byline .author { color: var(--color-brand-muted); font-weight: 600; }
.post-tldr {
  border: 1px solid var(--color-brand-line-2);
  border-left: 2px solid var(--color-brand-amber);
  border-radius: 6px;
  background: var(--color-brand-bg-2);
  padding: 1.15rem 1.35rem 1.25rem;
  margin-bottom: 2.75rem;
}
.post-tldr .label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-brand-amber);
  display: block;
  margin-bottom: 0.7rem;
}
.post-tldr ul { display: flex; flex-direction: column; gap: 0.55rem; }
.post-tldr li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-brand-muted);
}
.post-tldr li::before { content: '·'; position: absolute; left: 0.15rem; color: var(--color-brand-amber); font-weight: 700; }
.post-tldr li strong { color: var(--color-brand-fg); font-weight: 600; }

.post-body { font-size: 1.02rem; line-height: 1.8; color: var(--color-brand-muted); }
.post-body > * + * { margin-top: 1.15rem; }
.post-body h2 {
  font-family: var(--font-brand);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--color-brand-fg);
  margin-top: 2.75rem;
  display: flex; align-items: baseline; gap: 0.7rem;
}
.post-body h2::before {
  content: '';
  flex: none;
  width: 16px; height: 2px;
  background: var(--color-brand-amber);
  transform: translateY(-0.35rem);
}
.post-body h3 {
  font-family: var(--font-brand);
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--color-brand-fg);
  margin-top: 2rem;
}
.post-body strong { color: var(--color-brand-fg); font-weight: 600; }
.post-body a { color: var(--color-brand-amber); transition: color 160ms; }
.post-body a:hover { color: var(--color-brand-amber-hover); text-decoration: underline; }
.post-body ul, .post-body ol { display: flex; flex-direction: column; gap: 0.5rem; padding-left: 0.2rem; }
.post-body ul li { position: relative; padding-left: 1.15rem; }
.post-body ul li::before { content: '·'; position: absolute; left: 0.2rem; color: var(--color-brand-amber); font-weight: 700; }
.post-body ol { counter-reset: li; }
.post-body ol li { position: relative; padding-left: 1.7rem; counter-increment: li; }
.post-body ol li::before {
  content: counter(li, decimal-leading-zero);
  position: absolute; left: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-brand-amber);
  top: 0.25rem;
}
.post-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-brand-bg-3);
  border: 1px solid var(--color-brand-line);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  color: var(--color-brand-amber-bright);
}
.post-fig {
  margin-top: 2rem;
  border: 1px solid var(--color-brand-line);
  border-radius: 7px;
  background: var(--color-brand-bg-2);
  padding: 1.5rem 1.5rem 1.1rem;
}
.post-fig svg { display: block; width: 100%; height: auto; }
.post-fig figcaption {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-brand-muted-2);
}
.post-note {
  border: 1px solid var(--color-brand-line-2);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  font-size: 0.92rem;
  display: flex; gap: 0.85rem; align-items: baseline;
}
.post-note .mark {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-brand-info);
}
.post-cta {
  margin-top: 3rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-brand-line);
  font-size: 0.95rem;
  color: var(--color-brand-muted);
}
.post-cta a { color: var(--color-brand-amber); font-weight: 600; }
.post-cta a:hover { text-decoration: underline; }

/* ============================================================
   Footer (shodné s homepage vč. sloupce Blog)
   ============================================================ */
.footer { border-top: 1px solid var(--color-brand-line); padding: 2.5rem 0 3rem; background: var(--color-brand-bg); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem 1.5rem; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-col h3 {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-brand-muted-2);
  margin-bottom: 0.85rem;
}
.footer-col ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-col ul li a { font-family: var(--font-mono); font-size: 0.78rem; color: var(--color-brand-muted); transition: color 160ms; }
.footer-col ul li a:hover { color: var(--color-brand-amber); }
.footer-brand { display: flex; flex-direction: column; gap: 0.85rem; max-width: 300px; }
.footer-brand .wordmark { font-family: var(--font-display); font-size: 1.1rem; display: inline-flex; align-items: center; gap: 0.5rem; }
.footer-brand .wordmark .accent { color: var(--color-brand-amber); }
.footer-brand p { font-size: 0.82rem; color: var(--color-brand-muted-2); line-height: 1.6; }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-brand-line);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-brand-muted-3);
  flex-wrap: wrap; gap: 0.85rem;
}
.footer-bottom .ico { color: var(--color-brand-muted-2); }
.footer-bottom .meta { display: flex; gap: 1.5rem; flex-wrap: wrap; }