/* Shared public shell. Loaded last; legacy page CSS continues to own layout and diagrams. */
:root {
  color-scheme: dark;
  --bg: #0a1220; --page-bg: #0a1220; --page-glow: #0a1220;
  --panel: #111e30; --panel2: #17283e; --panel-strong: #111e30; --panel-muted: #17283e;
  --surface: #111e30; --surface-strong: #111e30; --surface-muted: #17283e; --soft: #0d1828;
  --text: #e8eef7; --muted: #b0c0d4;
  --line: #344961; --border: #344961; --line-strong: #6d87a6;
  --brand: #91bdff; --accent: #91bdff; --accent-strong: #bad5ff; --accent-soft: #17283e;
  --cyan: #91bdff; --amber: #edca83; --shadow: none;
  --ohmic-width: 1100px; --ohmic-radius: 12px;
}
html { scroll-padding-top: 16px; }
body[data-ohmic-page] { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 "Segoe UI", system-ui, sans-serif; }
body[data-ohmic-page] a { color: var(--accent); }
body[data-ohmic-page] a:hover { color: var(--accent-strong); }
body[data-ohmic-page] :focus-visible { outline: 3px solid #edca83; outline-offset: 4px; }
body[data-ohmic-page] h1 { font-size: clamp(1.875rem, 3vw, 2.25rem); line-height: 1.2; letter-spacing: -.025em; text-transform: none; margin: 0 0 16px; color: var(--text); }
body[data-ohmic-page] h2 { font-size: 1.375rem; line-height: 1.35; letter-spacing: -.015em; color: var(--text); }
body[data-ohmic-page] h3 { line-height: 1.4; color: var(--text); }
body[data-ohmic-page] .lead { font-size: 1.0625rem; line-height: 1.7; color: var(--muted); max-width: 72ch; }
body[data-ohmic-page] > .wrap, body[data-ohmic-page] > main { width: min(var(--ohmic-width), calc(100% - 40px)); max-width: var(--ohmic-width); padding: 32px 0 56px; margin: 0 auto; }
body[data-ohmic-page] > .wrap > main { padding: 0; }
body[data-ohmic-page="article"] > main { max-width: 820px; }
body[data-ohmic-page] .hero { padding: 24px; }
body[data-ohmic-page="account"] .hero { padding: 0 0 28px; }
body[data-ohmic-page] .hero h1, body[data-ohmic-page] .hero .lead { text-align: left; margin-left: 0; }
body[data-ohmic-page] .badge-row, body[data-ohmic-page] .action-row { justify-content: flex-start; }
body[data-ohmic-page] :is(.card,.panel,.goal-card,.path-card,.spec-card,.note-card,.teaching-card,.chooser-card,.library-card) { background: var(--surface); color: var(--text); border-color: var(--line); border-radius: var(--ohmic-radius); box-shadow: none; backdrop-filter: none; }
body[data-ohmic-page] :is(.hero-card,.next-card) { background: var(--surface); color: var(--text); border-color: var(--line); border-radius: var(--ohmic-radius); }
body[data-ohmic-page] :is(.sheet,.warning,.tile,.speaker-card,.speaker-table,.speaker-provenance,.speaker-image-placeholder,.tree-grid section,.band-card,.ladder,.fork,.band-chip,.takeaways article,.branch,.build-strip,.card-grid) { background: var(--surface); color: var(--text); border-color: var(--line); }
/* Inner reference cards have independent legacy surfaces, not just an outer panel. */
body[data-ohmic-page="article"] :is(.grid section,.fork-grid section,.steps div,.question) { background: var(--surface); color: var(--text); border-color: var(--line); min-width: 0; }
body[data-ohmic-page="article"] [data-ohmic-surface] { background: var(--surface) !important; color: var(--text); }
body[data-ohmic-page="article"] [data-ohmic-surface] :is(h2,h3,p,small,li) { color: var(--text) !important; }
/* Legacy editorial text panels and labels that hard-code the light palette. */
body[data-ohmic-page="article"] .specs-grid > div { background: var(--surface) !important; color: var(--text); }
body[data-ohmic-page="article"] p.formula[style*="background: #eee"] { background: var(--panel2) !important; }
body[data-ohmic-page="article"] .timeline h4 { color: var(--text) !important; }
body[data-ohmic-page="article"] main > p[style*="color: #666"] { color: var(--muted) !important; }
/* Pre-existing layout/readability defects; keep editorial sources independent. */
body[data-ohmic-page="article"] .speaker-grid > * { min-width: 0; }
body[data-ohmic-page="article"] .speaker-grid a { overflow-wrap: anywhere; }
body[data-ohmic-page="article"] .formula-block[style*="background: #eee"] { background: var(--panel2) !important; }
/* Preserve the crossover lane's meaningful pastel colors with dark labels. */
body[data-ohmic-page="article"] .lane div, body[data-ohmic-page="article"] .lane small { color: #17283e; }
body[data-ohmic-page] :is(.card,.panel,.goal-card,.path-card) p { color: var(--muted); opacity: 1; }
body[data-ohmic-page] :is(.badge,.pill,.eyebrow,.chip) { color: var(--muted); background: var(--soft); border-color: var(--line); letter-spacing: .04em; }
body[data-ohmic-page] :is(.btn,.action,button,.toplinks a) { min-height: 44px; padding: 10px 16px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--panel2); color: var(--text); box-shadow: none; font-size: .9375rem; font-weight: 600; letter-spacing: 0; text-transform: none; }
body[data-ohmic-page] :is(.btn.primary,button:not([hidden])) { background: #275b9b !important; color: #fff; }
body[data-ohmic-page] :is(button,.btn):disabled { opacity: .6; cursor: not-allowed; }
body[data-ohmic-page] [hidden] { display: none !important; }
body[data-ohmic-page] :is(input,select,textarea) { background: var(--soft); color: var(--text); border: 1px solid var(--line-strong); border-radius: 8px; min-height: 44px; font: inherit; }
body[data-ohmic-page] small { color: var(--muted); opacity: 1; }
body[data-ohmic-page] :is(.notice,.warning-box,.summary-box,.pro-tip,.tech-spec-box,.formula,.formula-block,.math-block,code) { background: var(--panel2); color: var(--text); border-color: var(--line-strong); }
body[data-ohmic-page] :is(th,td,figure,main > section,hr) { border-color: var(--line); }
body[data-ohmic-page] tbody tr:nth-child(even) { background: var(--panel2); }
body[data-ohmic-page] nav.breadcrumbs { background: var(--soft); border-color: var(--line); }
/* Diagram artwork retains its original canvas and semantic colors. */
body[data-ohmic-page] .diagram-container { color: #1a2028; }
.ohmic-header { padding: 0; margin: 0; background: #0d1828; border-bottom: 1px solid var(--line); backdrop-filter: none; }
.ohmic-header-inner { max-width: var(--ohmic-width); margin: auto; padding: 16px 0; display: flex; align-items: center; gap: 24px; justify-content: space-between; width: calc(100% - 40px); }
.ohmic-header .ohmic-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-size: 18px; font-weight: 700; letter-spacing: -.02em; white-space: nowrap; text-decoration: none; }
.ohmic-brand img { display: block; width: 42px; height: 42px; object-fit: contain; }
.ohmic-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; }
.ohmic-header .ohmic-nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 10px; color: var(--muted); font-size: 14px; font-weight: 600; letter-spacing: 0; border-radius: 8px; text-decoration: none; }
.ohmic-header .ohmic-nav a:hover, .ohmic-header .ohmic-nav a[aria-current] { background: var(--panel2); color: var(--text); }
.ohmic-header .ohmic-nav a[aria-current] { box-shadow: inset 0 -2px var(--accent); }
.ohmic-header .ohmic-nav .ohmic-account { border: 1px solid var(--line-strong); color: var(--text); margin-left: 6px; }
.ohmic-account { flex-wrap: wrap; gap: 0 6px; max-width: 180px; }
.ohmic-account .account-rail-title { font-size: 11px; text-transform: none; letter-spacing: 0; }
.ohmic-account .account-rail-sub { display: none; }
.ohmic-skip { position: absolute; left: 20px; top: -100px; z-index: 100; background: var(--panel2); padding: 12px 20px; }
.ohmic-skip:focus { top: 12px; }
.ohmic-shortcuts { width: min(var(--ohmic-width), calc(100% - 40px)); margin: 16px auto 0; }
.ohmic-shortcuts .tool-nav { display: flex; flex-wrap: wrap; gap: 8px; }
@media (max-width: 900px) { .ohmic-header-inner { flex-direction: column; align-items: flex-start; gap: 10px; } }
@media (max-width: 600px) {
  .ohmic-header-inner, body[data-ohmic-page] > .wrap, body[data-ohmic-page] > main { width: calc(100% - 32px); }
  body[data-ohmic-page] > main, body[data-ohmic-page] > .wrap { padding-top: 24px; }
  body[data-ohmic-page] .hero { padding: 18px; }
  .ohmic-nav { gap: 2px; } .ohmic-header .ohmic-nav a { padding: 8px; }
  .ohmic-header .ohmic-nav .ohmic-account { margin-left: 0; }
  body[data-ohmic-page] .path-grid { grid-template-columns: 1fr; }
  body[data-ohmic-page="article"] .specs-grid { grid-template-columns: 1fr !important; }
  body[data-ohmic-page="article"] .lane { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }