/* CHERNIAK STUDIO — מרכז הידע · עיצוב משותף */
:root {
  --bg: #060A15; --panel: #101830; --panel-2: #0B1226;
  --line: rgba(150,175,255,0.1); --line-strong: rgba(150,175,255,0.19);
  --accent: #4E7FFF; --accent-2: #7C90FF; --cyan: #59C8F5;
  --accent-soft: rgba(78,127,255,0.16); --accent-glow: rgba(78,127,255,0.55);
  --live: #3DD68C; --text: #F4F6FE; --muted: #9FA8C6; --faint: #78819E;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}
* { box-sizing: border-box; }
html { direction: rtl; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: 'Rubik', system-ui, sans-serif; font-size: 17px; line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  animation: kbFade 0.35s ease;
}
@keyframes kbFade { from { opacity: 0; } }
a { color: #A9BAFF; }
.kb-wrap { max-width: 1080px; margin: 0 auto; padding: 0 22px; }
::selection { background: var(--accent); color: #FFF; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* progress */
.kb-progress { position: fixed; top: 0; right: 0; left: 0; height: 3px; z-index: 90; pointer-events: none; }
.kb-progress i { display: block; height: 100%; width: 0; background: linear-gradient(270deg, var(--accent), var(--cyan)); }

/* nav */
.kb-nav { position: sticky; top: 0; z-index: 80; background: rgba(6,10,21,0.85); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.kb-nav-in { display: flex; align-items: center; gap: 22px; height: 62px; }
.brand { display: inline-flex; align-items: center; gap: 10px; direction: ltr; text-decoration: none; }
.brand .mark { width: 24px; height: 24px; }
.brand .bname { font-weight: 600; font-size: 13px; letter-spacing: 0.24em; color: var(--text); }
.brand .bsub { font-family: var(--mono); font-size: 7.5px; letter-spacing: 0.4em; color: var(--cyan); border: 1px solid rgba(89,200,245,0.32); border-radius: 4px; padding: 2.5px 3px 2.5px 7px; }
.kb-links { margin-inline-start: auto; display: flex; align-items: center; gap: 20px; }
.kb-links a { font-size: 13.5px; color: var(--muted); text-decoration: none; }
.kb-links a:hover { color: var(--text); }
.kb-links .kb-cta {
  color: #FFF; font-weight: 500; padding: 9px 18px; border-radius: 9px;
  background: linear-gradient(120deg, #6E92FF, #4E7FFF 55%, #45A8F2);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.3), 0 6px 18px -6px var(--accent-glow);
}
/* כפתור חזרה לאתר — בסגנון כפתורי המסגרת של האתר הראשי */
.kb-links .kb-back {
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--text); font-weight: 500;
  padding: 8px 16px; border-radius: 9px;
  border: 1px solid var(--line-strong); background: rgba(170,190,255,0.05);
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}
.kb-links .kb-back:hover {
  border-color: rgba(140,165,255,0.55); background: rgba(120,150,255,0.1);
  box-shadow: 0 6px 18px -8px var(--accent-glow);
}
.kb-links .kb-back svg { flex: none; transition: transform 0.25s ease; }
.kb-links .kb-back:hover svg { transform: translateX(3px); }
@media (max-width: 640px) {
  .kb-nav-in { gap: 12px; }
  .kb-links { gap: 12px; }
  .kb-links a:not(.kb-back):not(.kb-cta) { display: none; }
  .brand .bsub { display: none; }
  .kb-links .kb-back, .kb-links .kb-cta { padding: 8px 13px; font-size: 13px; }
}

/* hub */
.kb-hero { padding: 54px 0 40px; }
/* כפתור חזרה בולט בראש מרכז הידע — זכוכית עם נשימת אור וחץ חי */
.kb-hero-back {
  display: inline-flex; align-items: center; gap: 9px;
  margin-bottom: 30px; padding: 11px 22px; border-radius: 100px;
  font-size: 14px; font-weight: 500; color: var(--text); text-decoration: none;
  border: 1px solid rgba(140,165,255,0.38);
  background: linear-gradient(120deg, rgba(78,127,255,0.15), rgba(89,200,245,0.07));
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.09), 0 10px 26px -14px var(--accent-glow);
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}
.kb-hero-back:hover {
  transform: translateY(-2px);
  border-color: rgba(150,175,255,0.7);
  background: linear-gradient(120deg, rgba(78,127,255,0.24), rgba(89,200,245,0.12));
}
.kb-hero-back svg { flex: none; }
@media (prefers-reduced-motion: no-preference) {
  .kb-hero-back { animation: kbBackBreath 4.2s ease-in-out infinite; }
  @keyframes kbBackBreath {
    0%, 100% { box-shadow: inset 0 1px 0 rgba(255,255,255,0.09), 0 10px 26px -14px rgba(78,127,255,0.35); }
    50%      { box-shadow: inset 0 1px 0 rgba(255,255,255,0.09), 0 12px 34px -12px rgba(78,127,255,0.65); }
  }
  .kb-hero-back svg { animation: kbArrowNudge 2.4s ease-in-out infinite; }
  @keyframes kbArrowNudge {
    0%, 100% { transform: translateX(0); }
    50%      { transform: translateX(3.5px); }
  }
}
.kb-kicker { display: block; font-size: 12.5px; font-weight: 500; letter-spacing: 0.14em; color: var(--accent-2); }
.kb-hero h1 { margin: 10px 0 12px; font-size: clamp(34px, 6vw, 52px); font-weight: 600; line-height: 1.15;
  background: linear-gradient(180deg, #FBFCFF 25%, #BCC7EC); -webkit-background-clip: text; background-clip: text; color: transparent; }
.kb-hero p { margin: 0; max-width: 56ch; color: var(--muted); font-size: 17px; }
.kb-cats { display: flex; flex-wrap: wrap; gap: 9px; padding: 26px 0 8px; }
.kb-cat-btn {
  font-size: 13px; color: var(--muted); background: rgba(170,190,255,0.04);
  border: 1px solid var(--line-strong); border-radius: 100px; padding: 7px 15px; cursor: pointer;
  font-family: inherit; transition: all 0.2s ease;
}
.kb-cat-btn:hover { color: var(--text); border-color: rgba(140,165,255,0.5); }
.kb-cat-btn.on { background: var(--accent-soft); color: #C6CFFF; border-color: rgba(120,150,255,0.55); }
.kb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; padding: 26px 0 90px; }
.kb-card {
  display: flex; flex-direction: column; gap: 10px; padding: 24px 22px; text-decoration: none;
  border: 1px solid transparent; border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0) 26%) padding-box,
    linear-gradient(rgba(14,21,40,0.85), rgba(14,21,40,0.85)) padding-box,
    linear-gradient(150deg, rgba(120,150,255,0.4), rgba(120,150,255,0.08) 40%, rgba(89,200,245,0.3)) border-box;
  box-shadow: 0 18px 40px -18px rgba(2,5,16,0.7);
  transition: transform 0.3s cubic-bezier(0.22,1,0.36,1), box-shadow 0.3s ease;
}
.kb-card:hover { transform: translateY(-4px); box-shadow: 0 26px 54px -18px rgba(2,5,16,0.85), 0 0 40px rgba(78,127,255,0.12); }
.kb-card .cat { font-size: 11.5px; font-weight: 500; letter-spacing: 0.08em; color: var(--accent-2); }
.kb-card h3 { margin: 0; font-size: 18.5px; font-weight: 600; color: var(--text); line-height: 1.45; }
.kb-card p { margin: 0; font-size: 14px; color: var(--muted); line-height: 1.7; }
.kb-card .meta { margin-top: auto; padding-top: 10px; font-size: 12.5px; color: var(--faint); display: flex; gap: 14px; }
.kb-card[hidden] { display: none; }

/* article */
.kb-layout { display: grid; grid-template-columns: 1fr 230px; gap: 48px; padding: 54px 0 30px; align-items: start; }
.kb-crumbs { grid-column: 1 / -1; font-size: 13px; color: var(--faint); margin-bottom: -18px; }
.kb-crumbs a { color: var(--faint); text-decoration: none; }
.kb-crumbs a:hover { color: var(--muted); }
article .kb-cat-tag { font-size: 12.5px; font-weight: 500; letter-spacing: 0.1em; color: var(--accent-2); }
article h1 { margin: 10px 0 14px; font-size: clamp(30px, 5vw, 44px); font-weight: 600; line-height: 1.22;
  background: linear-gradient(180deg, #FBFCFF 25%, #C4CDEE); -webkit-background-clip: text; background-clip: text; color: transparent; }
.kb-intro { font-size: 18.5px; color: #C8CFE8; line-height: 1.8; margin: 0 0 18px; }
.kb-meta { display: flex; flex-wrap: wrap; gap: 18px; font-size: 13px; color: var(--faint); border-block: 1px solid var(--line); padding: 12px 2px; margin-bottom: 30px; }
article h2 { font-size: 24px; font-weight: 600; margin: 42px 0 12px; scroll-margin-top: 90px; }
article h3 { font-size: 18px; font-weight: 600; margin: 26px 0 8px; }
article p, article li { color: #B9C1DB; }
article ul, article ol { padding-inline-start: 22px; }
article li { margin-bottom: 6px; }
article strong { color: var(--text); font-weight: 600; }
.kb-fig { margin: 28px 0; border: 1px solid var(--line-strong); border-radius: 14px; overflow: hidden; background: var(--panel-2); }
.kb-fig svg, .kb-fig img, .kb-fig iframe { display: block; width: 100%; height: auto; }
.kb-fig iframe { aspect-ratio: 16 / 9; border: 0; }
.kb-fig figcaption { font-size: 12.5px; color: var(--faint); padding: 10px 16px; border-top: 1px solid var(--line); }
.table-scroll { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line-strong); border-radius: 12px; }
article table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 480px; }
article th { text-align: right; font-weight: 600; color: var(--text); background: rgba(120,150,255,0.07); padding: 11px 14px; }
article td { padding: 11px 14px; border-top: 1px solid var(--line); color: #B9C1DB; }
article td b { color: var(--text); }
.kb-note { border-inline-start: 3px solid var(--accent); background: rgba(78,127,255,0.06); border-radius: 8px; padding: 14px 18px; margin: 22px 0; font-size: 15px; color: #C8CFE8; }
.kb-faq details { border: 1px solid var(--line-strong); border-radius: 11px; margin-bottom: 10px; background: rgba(14,21,40,0.7); }
.kb-faq summary { cursor: pointer; padding: 14px 18px; font-weight: 600; color: var(--text); font-size: 15.5px; list-style: none; position: relative; }
.kb-faq summary::after { content: "+"; position: absolute; inset-inline-end: 16px; color: var(--accent-2); font-size: 18px; }
.kb-faq details[open] summary::after { content: "–"; }
.kb-faq details p { margin: 0; padding: 0 18px 16px; font-size: 14.5px; }

/* toc */
.kb-toc { position: sticky; top: 84px; border-inline-start: 1px solid var(--line); padding-inline-start: 20px; font-size: 13.5px; }
.kb-toc b { display: block; font-size: 12px; letter-spacing: 0.1em; color: var(--faint); margin-bottom: 10px; font-weight: 500; }
.kb-toc ol { list-style: none; margin: 0; padding: 0; }
.kb-toc a { display: block; padding: 5px 0; color: var(--muted); text-decoration: none; transition: color 0.2s; }
.kb-toc a:hover { color: var(--text); }
.kb-toc a.on { color: #A9BAFF; }

/* end CTA */
.kb-cta-end {
  margin: 50px 0; padding: 40px 34px; text-align: center; border-radius: 18px; border: 1px solid transparent;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0) 30%) padding-box,
    linear-gradient(rgba(14,21,40,0.9), rgba(14,21,40,0.9)) padding-box,
    linear-gradient(150deg, rgba(120,150,255,0.45), rgba(120,150,255,0.1) 40%, rgba(89,200,245,0.35)) border-box;
}
.kb-cta-end h2 { margin: 0 0 10px; font-size: 26px; }
.kb-cta-end p { margin: 0 auto 22px; max-width: 50ch; color: var(--muted); }
.kb-cta-end .row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.kb-btn {
  display: inline-block; text-decoration: none; font-weight: 500; font-size: 15px; border-radius: 10px; padding: 13px 28px;
  background: linear-gradient(120deg, #6E92FF, #4E7FFF 55%, #45A8F2); color: #FFF;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.32), 0 8px 24px -8px var(--accent-glow);
}
.kb-btn.ghost { background: rgba(255,255,255,0.03); color: var(--text); border: 1px solid var(--line-strong); box-shadow: none; }

/* related + prev/next */
.kb-related h2 { font-size: 20px; margin: 0 0 16px; }
.kb-related .kb-grid { padding: 0 0 10px; }
.kb-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 30px 0 70px; }
.kb-pn a { border: 1px solid var(--line-strong); border-radius: 12px; padding: 16px 18px; text-decoration: none; background: rgba(14,21,40,0.7); transition: border-color 0.2s; }
.kb-pn a:hover { border-color: rgba(140,165,255,0.5); }
.kb-pn small { display: block; font-size: 11.5px; color: var(--faint); margin-bottom: 4px; }
.kb-pn b { color: var(--text); font-size: 14.5px; font-weight: 600; }
.kb-pn .next { text-align: left; }
.kb-pn a:empty { visibility: hidden; }

.kb-footer { border-top: 1px solid var(--line); padding: 26px 0 34px; font-size: 12.5px; color: var(--faint); }
.kb-footer .kb-wrap { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; }

@media (max-width: 900px) {
  .kb-layout { grid-template-columns: 1fr; gap: 26px; }
  .kb-toc { position: static; border: 1px solid var(--line-strong); border-radius: 12px; padding: 14px 18px; }
  .kb-pn { grid-template-columns: 1fr; }
}