/* ═══════════════════════════════════════════
   Background — subtle grid + PCB / neuron motif
   ═══════════════════════════════════════════ */
:root {
  --bg-base: #f4f6fb;
  --bg-grid: rgba(99, 102, 241, 0.07);
  --bg-accent: rgba(99, 102, 241, 0.05);
  --bg-node: rgba(79, 70, 229, 0.18);
  --bg-line: rgba(79, 70, 229, 0.09);
}

[data-md-color-scheme="slate"] {
  --bg-base: #12141a;
  --bg-grid: rgba(129, 140, 248, 0.06);
  --bg-accent: rgba(129, 140, 248, 0.04);
  --bg-node: rgba(165, 180, 252, 0.14);
  --bg-line: rgba(165, 180, 252, 0.07);
}

html {
  background-color: var(--bg-base);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-color: var(--bg-base);
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px),
    radial-gradient(circle at 15% 20%, var(--bg-accent) 0%, transparent 42%),
    radial-gradient(circle at 85% 75%, var(--bg-accent) 0%, transparent 38%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='480' height='480' viewBox='0 0 480 480'%3E%3Cg fill='none' stroke='%234f46e5' stroke-opacity='0.11' stroke-width='1'%3E%3Cpath d='M40 120h80l40-40 60 60 80-80 120 120'/%3E%3Cpath d='M60 320h100l30 30 70-70 90 90 70-50'/%3E%3Cpath d='M200 40v60l50 50V200'/%3E%3Cpath d='M360 260v80l-60 40'/%3E%3C/g%3E%3Cg fill='%234f46e5' fill-opacity='0.13'%3E%3Ccircle cx='120' cy='120' r='4'/%3E%3Ccircle cx='240' cy='80' r='3'/%3E%3Ccircle cx='380' cy='200' r='4'/%3E%3Ccircle cx='160' cy='350' r='3'/%3E%3Ccircle cx='320' cy='380' r='4'/%3E%3Ccircle cx='420' cy='120' r='3'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 32px 32px, 32px 32px, 100% 100%, 100% 100%, 480px 480px;
  background-position: 0 0, 0 0, 0 0, 0 0, center;
  opacity: 0.85;
}

body::after {
  content: "";
  position: fixed;
  inset: -20%;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(ellipse at 30% 40%, rgba(99, 102, 241, 0.06), transparent 55%),
              radial-gradient(ellipse at 70% 60%, rgba(139, 92, 246, 0.05), transparent 50%);
  animation: bg-drift 90s ease-in-out infinite alternate;
}

@media (prefers-reduced-motion: reduce) {
  body::after {
    animation: none;
  }
}

@keyframes bg-drift {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(2%, -1.5%) scale(1.03); }
}

/* Content panels — readable over background */
.md-main__inner {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(6px);
  border-radius: 0.5rem;
  margin: 0.5rem;
  padding-bottom: 1rem;
}

[data-md-color-scheme="slate"] .md-main__inner {
  background: rgba(22, 25, 32, 0.78);
}

.md-header {
  background: rgba(255, 255, 255, 0.88) !important;
  backdrop-filter: blur(8px);
}

[data-md-color-scheme="slate"] .md-header {
  background: rgba(18, 20, 26, 0.9) !important;
}

.md-sidebar__inner {
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(4px);
}

[data-md-color-scheme="slate"] .md-sidebar__inner {
  background: rgba(18, 20, 26, 0.72);
}

/* ═══════════════════════════════════════════
   RTL / LTR — strict separation
   ═══════════════════════════════════════════ */
.md-typeset .arithmatex,
.md-typeset mjx-container,
.md-typeset mjx-container * {
  direction: ltr;
  unicode-bidi: isolate;
}

.md-typeset .he-only,
.md-typeset .formula-caption,
.md-typeset .study-step,
.md-typeset .md-typeset__table {
  direction: rtl;
  unicode-bidi: isolate;
}

/* Math blocks — LTR only, never Hebrew inside */
.md-typeset .formula-block {
  direction: ltr;
  unicode-bidi: isolate;
  display: block;
  margin: 0.5em 0;
  padding: 0.65em 0.85em;
  text-align: center;
  background: rgba(99, 102, 241, 0.06);
  border: 1px solid rgba(99, 102, 241, 0.12);
  border-radius: 0.4rem;
  overflow-x: auto;
}

[data-md-color-scheme="slate"] .md-typeset .formula-block {
  background: rgba(129, 140, 248, 0.08);
  border-color: rgba(129, 140, 248, 0.15);
}

.md-typeset .formula-caption {
  text-align: center;
  font-size: 0.92em;
  color: var(--md-default-fg-color--light);
  margin: 0.15em 0 0.65em;
}

.md-typeset .formula-row {
  margin: 0.75em 0 1em;
}

.md-typeset div.arithmatex {
  display: block;
  margin: 0.4em 0;
  text-align: center;
}

/* Tables */
.md-typeset table {
  width: 100%;
  table-layout: fixed;
  background: rgba(255, 255, 255, 0.55);
}

[data-md-color-scheme="slate"] .md-typeset table {
  background: rgba(30, 33, 42, 0.55);
}

.md-typeset table th,
.md-typeset table td {
  vertical-align: top;
  padding: 0.65em 0.75em;
}

.md-typeset table th:first-child,
.md-typeset table td:first-child {
  direction: rtl;
  text-align: right;
  width: 28%;
}

.md-typeset table th:nth-child(2),
.md-typeset table td:nth-child(2) {
  direction: ltr;
  text-align: center;
  width: 44%;
}

.md-typeset table th:nth-child(3),
.md-typeset table td:nth-child(3) {
  direction: rtl;
  text-align: right;
  width: 28%;
}

/* Sign / wide tables (investigation) */
.md-typeset table.sign-table th:first-child,
.md-typeset table.sign-table td:first-child {
  direction: rtl;
  text-align: right;
  width: 16%;
}

.md-typeset table.sign-table th:not(:first-child),
.md-typeset table.sign-table td:not(:first-child) {
  direction: ltr;
  text-align: center;
  width: auto;
}

/* 2-column domain tables */
.md-typeset table th:first-child:nth-last-child(2),
.md-typeset table td:first-child:nth-last-child(2) {
  width: 30%;
}

.md-typeset table th:last-child:nth-first-child(2),
.md-typeset table td:last-child:nth-first-child(2) {
  width: 70%;
  direction: ltr;
  text-align: center;
}

/* Study steps */
.md-typeset .study-step {
  border-right: 4px solid var(--md-primary-fg-color);
  padding: 0.35em 1em 0.35em 0;
  margin: 1em 0;
  background: rgba(99, 102, 241, 0.04);
  border-radius: 0 0.35rem 0.35rem 0;
}

.md-typeset .study-step h3 {
  margin-top: 0;
}

/* Admonitions — math in separate block inside */
.md-typeset .admonition .formula-block {
  margin-top: 0.5em;
}

/* Avoid inline math in Hebrew paragraphs when possible */
.md-typeset p .arithmatex {
  display: inline-block;
  vertical-align: middle;
  margin: 0 0.12em;
  direction: ltr;
  unicode-bidi: isolate;
}

/* Nav table on index — both columns RTL */
.md-typeset .nav-table th,
.md-typeset .nav-table td {
  direction: rtl;
  text-align: right;
  width: 50%;
}

.md-typeset .nav-table th:nth-child(2),
.md-typeset .nav-table td:nth-child(2) {
  text-align: left;
  direction: rtl;
}