/* MAT Masterclass - site layer on the MAT+ design kit (kit.css). Shared chrome copied from MAT Universe
   (universe.marcalbrechttrading.com) so the two sites read as one universe; the masterclass parts follow. */
:root {
  --brand: #7c7cf7; --brand-hi: #a5b4fc; --brand-rgb: 124, 124, 247; --brand-2-rgb: 139, 92, 246;
  --steel: #c9ced5;
  --g-tools: #818cf8; --g-learn: #f5b34a; --g-research: #22d3ee; --g-infra: #94a3b8; --g-core: #e8ecf8;
  --rule: rgba(148, 172, 216, 0.14);
}
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body.k-body { min-height: 100vh; overflow-x: hidden; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 200; padding: 10px 14px; background: var(--k-card); border-radius: 10px; }
.skip:focus { left: 12px; }
img { max-width: 100%; height: auto; }

/* nav */
.k-brand .mark { width: 30px; height: 31px; flex: none; }
.k-brand .wm { display: flex; flex-direction: column; line-height: 1.05; }
.k-brand .wm small { font: 700 9.5px/1.2 var(--k-mono); letter-spacing: .2em; color: var(--brand-hi); text-transform: uppercase; }
.nav-auth { display: inline-flex; align-items: center; gap: 8px; }
.nav-auth .who { font: 600 12px/1.2 var(--k-mono); color: var(--k-text-2); white-space: nowrap; }
.menu-btn { display: none; }
@media (max-width: 1060px) {
  .k-nav .k-container { gap: 10px; }
  .k-nav-links { display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; gap: 2px; padding: 10px 16px 16px; background: rgba(3,7,17,.97); border-bottom: 1px solid var(--rule); }
  .k-nav-links.open { display: flex; }
  .k-nav-links a { height: 44px; font-size: 15px; }
  .menu-btn { display: inline-flex; margin-left: auto; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: 12px; border: 1px solid var(--rule); background: transparent; color: var(--k-text); cursor: pointer; }
  .nav-auth { margin-left: 0; }
}
@media (max-width: 480px) { .k-brand .wm span { font-size: 15px; } .nav-auth .who { display: none; } .k-nav-cta { padding: 0 14px; } }

/* hero */
.u-hero { position: relative; overflow: hidden; padding: 96px 0 40px; background:
  radial-gradient(70% 55% at 50% -5%, rgba(var(--brand-rgb), .16), transparent 62%),
  radial-gradient(40% 35% at 88% 12%, rgba(34, 211, 238, .07), transparent 60%),
  radial-gradient(45% 40% at 10% 30%, rgba(245, 179, 74, .05), transparent 60%), var(--k-bg); }
.u-hero .k-h1 { max-width: 15ch; }
.u-hero .k-lede { max-width: 700px; }
.u-hero > .k-container { position: relative; z-index: 2; text-align: center; }
@media (max-width: 640px) { .u-hero { padding: 56px 0 28px; } }
.page-hero { position: relative; padding: 72px 0 36px; background: radial-gradient(60% 60% at 50% 0%, rgba(var(--brand-rgb), .12), transparent 65%), var(--k-bg); border-bottom: 1px solid var(--k-border); }
.page-hero .k-h1 { margin-left: 0; text-align: left; max-width: 20ch; font-size: clamp(34px, 5vw, 58px); }
.page-hero .k-lede { margin-left: 0; }
@media (max-width: 640px) { .page-hero { padding: 44px 0 24px; } }

/* live ribbon: real numbers or nothing */
.ribbon { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 1px; margin: 44px auto 0; max-width: 980px; border: 1px solid var(--rule); border-radius: 18px; overflow: hidden; background: var(--rule); text-align: left; }
.ribbon > div { background: rgba(7, 11, 23, .92); padding: 16px 18px; }
.ribbon .v { display: block; font: 800 26px/1.1 var(--k-mono); color: var(--k-text); letter-spacing: -.02em; }
.ribbon .l { display: block; margin-top: 6px; color: var(--k-text-2); font-size: 12.5px; line-height: 1.4; }
.ribbon .src { display: block; overflow-wrap: anywhere; margin-top: 4px; font: 500 10.5px/1.3 var(--k-mono); color: var(--k-muted); }
[data-live][hidden], [hidden] { display: none !important; }

/* FIG. labels */
.fig { display: flex; align-items: baseline; gap: 12px; margin: 0 0 14px; font: 700 11px/1.4 var(--k-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--k-muted); }
.fig b { color: var(--brand-hi); font-weight: 800; }
.fig::after { content: ""; flex: 1; height: 1px; background: var(--rule); transform: translateY(-3px); }

/* FIG. 1 the universe map */
.map-wrap { display: grid; gap: 28px; align-items: center; }
@media (min-width: 980px) { .map-wrap { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); } }
.map { position: relative; width: 100%; max-width: 640px; margin: 0 auto; aspect-ratio: 1 / 1; }
.map svg { display: block; width: 100%; height: 100%; overflow: visible; }
.map .orbit { fill: none; stroke: rgba(148, 172, 216, .16); stroke-width: 1.2; }
.map .orbit.outer { stroke-dasharray: 2 7; }
.map .spoke { stroke: rgba(var(--brand-rgb), .28); stroke-width: 1.2; }
.map .link { stroke: rgba(148, 172, 216, .14); stroke-width: 1; stroke-dasharray: 3 5; }
.map .node { cursor: pointer; outline: none; }
.map .node circle.dot { stroke-width: 2.5; transition: fill-opacity .3s; fill-opacity: .2; }
.map .node circle.halo { fill: none; stroke-width: 1; opacity: 0; transition: opacity .3s; }
.map .node text { font: 600 25px var(--k-font); fill: #b6c3da; letter-spacing: -.01em; transition: fill .2s; }
.map .node text.code { font: 800 19px var(--k-mono); fill: #fff; letter-spacing: .04em; }
.map .node text.sub { font: 500 14px var(--k-mono); fill: var(--k-muted); letter-spacing: .06em; text-transform: uppercase; }
.map .node:hover text, .map .node:focus-visible text, .map .node.on text { fill: var(--k-text); }
.map .node:hover circle.dot, .map .node:focus-visible circle.dot, .map .node.on circle.dot { fill-opacity: .5; }
.map .node circle.dot { filter: drop-shadow(0 0 10px currentColor); }
.map .node.on circle.halo, .map .node:focus-visible circle.halo { opacity: .9; }
.map .core circle.dot { fill: #0c1424; fill-opacity: 1; stroke: rgba(var(--brand-rgb), .55); }
.map .core.on circle.dot { fill-opacity: 1; }
.map .pulse { transform-origin: center; transform-box: fill-box; animation: pulse 3.2s var(--k-ease) infinite; }
@keyframes pulse { 0% { opacity: .7; transform: scale(1); } 100% { opacity: 0; transform: scale(1.9); } }
@media (prefers-reduced-motion: reduce) { .map .pulse { animation: none; opacity: 0; } }
.map-legend { display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: center; margin-top: 10px; font: 600 11.5px/1.4 var(--k-mono); color: var(--k-text-2); }
.map-legend i { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 7px; vertical-align: 0; }
.panel { background: linear-gradient(180deg, rgba(var(--brand-rgb), .07), var(--k-card) 55%); border: 1px solid rgba(var(--brand-rgb), .22); border-radius: 20px; padding: 26px; box-shadow: var(--k-shadow-card); min-height: 330px; }
.panel .grp { font: 700 11px/1.4 var(--k-mono); letter-spacing: .14em; text-transform: uppercase; }
.panel h3 { margin: 10px 0 0; font: 800 28px/1.15 var(--k-font); letter-spacing: -.03em; }
.panel p { color: var(--k-text-2); margin: 12px 0 0; font-size: 15.5px; }
.panel .access { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--rule); font-size: 14px; color: var(--k-text); }
.panel .access b { display: block; font: 700 10.5px/1.4 var(--k-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--k-muted); margin-bottom: 4px; }
.panel .k-btn { margin-top: 20px; }

/* the path: Free -> KXTL -> MAT+ -> add-ons */
.path { position: relative; display: grid; gap: 14px; counter-reset: st; }
@media (min-width: 900px) { .path { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; } }
.station { position: relative; padding: 24px 22px 22px; background: var(--k-card); border: 1px solid var(--k-border); border-radius: 18px; }
@media (min-width: 900px) {
  .station { border-radius: 0; border-right-width: 0; }
  .station:first-child { border-radius: 18px 0 0 18px; }
  .station:last-child { border-radius: 0 18px 18px 0; border-right-width: 1px; }
}
.station.hi { background: linear-gradient(180deg, rgba(var(--brand-rgb), .12), var(--k-card) 70%); border-color: rgba(var(--brand-rgb), .35); }
@media (min-width: 900px) { .station.hi { border-right-width: 1px; } .station.hi + .station { border-left-width: 0; } }
.station .n { font: 800 11px/1 var(--k-mono); letter-spacing: .14em; color: var(--k-muted); }
.station h3 { margin: 10px 0 2px; font: 800 20px/1.2 var(--k-font); letter-spacing: -.02em; }
.station .price { font: 700 15px/1.3 var(--k-mono); color: var(--brand-hi); }
.station ul { margin: 14px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.station li { position: relative; padding-left: 20px; color: var(--k-text-2); font-size: 14px; line-height: 1.5; }
.station li::before { content: ""; position: absolute; left: 2px; top: .62em; width: 8px; height: 8px; border-radius: 50%; border: 2px solid var(--k-green); }
.station .more { display: inline-block; margin-top: 16px; font-weight: 600; font-size: 14px; }

/* bundle (paid EAs with MAT+ + KXTL): value panel + one card per paid EA, prices read live */
.bundle { --gold-rgb: 245, 179, 74; position: relative; display: grid; gap: 26px; padding: 24px; border-radius: 24px; border: 1px solid rgba(var(--gold-rgb), .26); overflow: hidden;
  background: radial-gradient(70% 90% at 100% 0%, rgba(var(--gold-rgb), .10), transparent 60%), radial-gradient(60% 70% at 0% 100%, rgba(var(--brand-rgb), .10), transparent 60%), var(--k-card); box-shadow: var(--k-shadow-card); }
.bundle::before { content: ""; position: absolute; inset: 0 0 auto; height: 1px; background: linear-gradient(90deg, transparent, rgba(var(--gold-rgb), .7), transparent); }
@media (min-width: 900px) { .bundle { grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); gap: 36px; padding: 40px; align-items: start; } }
.bundle .k-h2-sub { margin-left: 0; }
.bundle .k-actions { margin-top: 26px; }
.value { margin-top: 24px; padding: 20px; border-radius: 18px; background: linear-gradient(180deg, rgba(3, 7, 17, .55), rgba(3, 7, 17, .25)); border: 1px solid rgba(var(--gold-rgb), .18); }
.value-row, .value-save { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 14px; }
.value-l { font: 700 11px/1.5 var(--k-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--k-muted); }
.value-total { font: 800 20px/1.2 var(--k-mono); font-variant-numeric: tabular-nums; color: var(--k-text-2); }
.strike, .ec-was s { position: relative; text-decoration: none; }
.strike::after, .ec-was s::after { content: ""; position: absolute; left: -3%; right: -3%; top: 52%; height: 2px; border-radius: 2px; background: rgba(239, 68, 68, .8); transform-origin: left; }
.value-rent { margin: 6px 0 0; font: 600 13px/1.5 var(--k-mono); color: var(--k-text-2); }
.value-save { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--rule); }
.save-big { display: inline-block; text-align: right; font: 800 clamp(38px, 5.2vw, 58px)/1.02 var(--k-mono); letter-spacing: -.04em; font-variant-numeric: tabular-nums; white-space: nowrap;
  background: linear-gradient(135deg, #fff3d6 0%, #ffd98a 40%, #f5b34a 100%); -webkit-background-clip: text; background-clip: text; color: transparent; filter: drop-shadow(0 6px 24px rgba(var(--gold-rgb), .25)); }
.meter { position: relative; height: 8px; margin-top: 16px; border-radius: 999px; background: rgba(148, 172, 216, .1); overflow: hidden; }
.meter i { position: absolute; inset: 0 auto 0 0; width: var(--p, 0%); border-radius: inherit; background: linear-gradient(90deg, #10b981, #6ee7b7 60%, #ffd98a); box-shadow: 0 0 16px rgba(16, 185, 129, .45); }
.value-pct { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin-top: 12px; color: var(--k-text-2); font-size: 13.5px; }
.save { display: inline-flex; padding: 5px 12px; border-radius: 999px; background: rgba(16, 185, 129, .12); border: 1px solid rgba(16, 185, 129, .38); color: #6ee7b7; font: 800 13px/1.3 var(--k-mono); }
.value .k-note { margin: 12px 0 0; }

.bundle-cards { container-type: inline-size; min-width: 0; }
.ea-cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.ea-card { position: relative; display: grid; grid-template-columns: 64px minmax(0, 1fr); grid-template-areas: "img body" "price price" "foot foot"; gap: 14px 16px; align-items: center;
  padding: 18px; border-radius: 18px; background: linear-gradient(180deg, rgba(22, 32, 64, .55), rgba(12, 20, 36, .9)); border: 1px solid var(--k-border-2); isolation: isolate;
  transform: perspective(900px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)); transition: transform .35s var(--k-ease), border-color .3s var(--k-ease), box-shadow .3s var(--k-ease); }
@container (min-width: 520px) {
  .ea-card { grid-template-columns: 64px minmax(0, 1fr) auto; grid-template-areas: "img body price" "foot foot foot"; }
  .ec-price { flex-direction: column; align-items: flex-end; text-align: right; }
}
.ec-glow { position: absolute; inset: 0; z-index: -1; border-radius: inherit; opacity: 0; transition: opacity .3s var(--k-ease); pointer-events: none;
  background: radial-gradient(260px circle at var(--mx, 50%) var(--my, 0%), rgba(var(--gold-rgb), .16), transparent 65%); }
.ec-img { grid-area: img; width: 64px; height: 64px; border-radius: 14px; object-fit: cover; background: #111c34; box-shadow: 0 0 0 1px rgba(255, 255, 255, .06), 0 8px 22px rgba(0, 0, 0, .35); }
.ec-body { grid-area: body; min-width: 0; }
.ec-name { margin: 0; font: 800 18px/1.2 var(--k-font); letter-spacing: -.02em; }
.ec-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; margin-top: 6px; font: 500 12px/1.4 var(--k-mono); color: var(--k-muted); }
.chip { display: inline-flex; padding: 2px 8px; border-radius: 6px; background: rgba(var(--brand-rgb), .14); border: 1px solid rgba(var(--brand-rgb), .3); color: var(--brand-hi); font: 800 10.5px/1.5 var(--k-mono); letter-spacing: .08em; }
.ec-price { grid-area: price; display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 10px; }
.ec-l { font: 700 10px/1.4 var(--k-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--k-muted); }
.ec-was { font: 800 22px/1.15 var(--k-mono); font-variant-numeric: tabular-nums; color: var(--k-text); letter-spacing: -.02em; }
.ec-rent { font: 600 12.5px/1.4 var(--k-mono); color: var(--k-text-2); }
.ec-foot { grid-area: foot; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 12px; padding-top: 12px; border-top: 1px solid var(--k-border-2); }
.ec-inc { display: inline-flex; align-items: center; gap: 7px; font: 700 11px/1.3 var(--k-mono); letter-spacing: .08em; text-transform: uppercase; color: #6ee7b7; }
.ec-inc::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #10b981; box-shadow: 0 0 0 3px rgba(16, 185, 129, .18), 0 0 12px rgba(16, 185, 129, .6); }
.ec-link { display: inline-flex; align-items: center; min-height: 44px; font-weight: 600; font-size: 14px; }
.ec-more { margin-top: 14px; }
@media (hover: hover) and (pointer: fine) {
  .ea-card:hover { border-color: rgba(var(--gold-rgb), .38); box-shadow: 0 18px 44px rgba(0, 0, 0, .35), 0 0 0 1px rgba(var(--gold-rgb), .12); transform: perspective(900px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)) translateY(-3px); }
  .ea-card:hover .ec-glow { opacity: 1; }
}
/* reveal: only once app.js has taken over the block and motion is allowed */
.bundle.anim .ea-card:not(.in) { opacity: 0; transform: translateY(16px); }
.bundle.anim .ea-card.in { transition: opacity .6s var(--k-ease) calc(var(--i, 0) * 110ms), transform .6s var(--k-ease) calc(var(--i, 0) * 110ms), border-color .3s var(--k-ease), box-shadow .3s var(--k-ease); }
.bundle.anim .meter i { width: 0; transition: width 1.4s var(--k-ease) .2s; }
.bundle.anim.in .meter i { width: var(--p, 0%); }
.bundle.anim .strike::after, .bundle.anim .ec-was s::after { transform: scaleX(0); transition: transform .7s var(--k-ease) .6s; }
.bundle.anim.in .strike::after, .bundle.anim .ea-card.in .ec-was s::after { transform: scaleX(1); }
@media (prefers-reduced-motion: reduce) {
  .ea-card, .ec-glow, .meter i, .strike::after, .ec-was s::after { transition: none !important; }
  .ea-card, .ea-card:hover { transform: none !important; }
}

details.more-list summary { cursor: pointer; font-weight: 600; color: var(--brand-hi); margin-top: 10px; list-style: none; }
details.more-list summary::-webkit-details-marker { display: none; }
details.more-list summary::after { content: " +"; }
details.more-list[open] summary::after { content: " -"; }

/* EA library cards (bespoke: listing image + spec line) */
.eas { display: grid; gap: 14px; }
@media (min-width: 760px) { .eas { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1140px) { .eas { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.ea { display: flex; flex-direction: column; gap: 12px; padding: 20px; background: var(--k-card); border: 1px solid var(--k-border); border-radius: 18px; }
.ea.target { border-color: rgba(245, 179, 74, .55); box-shadow: 0 0 0 3px rgba(245, 179, 74, .12); }
.ea .top { display: flex; gap: 14px; align-items: center; }
.ea .top img { width: 64px; height: 64px; border-radius: 14px; flex: none; }
.ea h3 { margin: 0; font: 800 18px/1.2 var(--k-font); letter-spacing: -.02em; }
.ea .spec { margin-top: 4px; font: 600 11.5px/1.4 var(--k-mono); color: var(--k-muted); letter-spacing: .04em; }
.ea p { margin: 0; color: var(--k-text-2); font-size: 14.5px; line-height: 1.55; flex: 1; }
.ea .acts { display: flex; flex-wrap: wrap; gap: 8px; }
.tagline { display: inline-flex; align-items: center; gap: 6px; font: 700 10.5px/1 var(--k-mono); letter-spacing: .1em; text-transform: uppercase; padding: 6px 10px; border-radius: 999px; }
.tagline.free { color: #6ee7b7; background: rgba(16, 185, 129, .1); border: 1px solid rgba(16, 185, 129, .3); }
.tagline.paid { color: #ffd98a; background: rgba(245, 179, 74, .1); border: 1px solid rgba(245, 179, 74, .32); }

/* ranking table (Algo Hub) */
.rank { width: 100%; border-collapse: collapse; font-size: 14px; }
.rank th { text-align: left; font: 700 10.5px/1.4 var(--k-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--k-muted); padding: 10px 12px; border-bottom: 1px solid var(--rule); }
.rank td { padding: 14px 12px; border-bottom: 1px solid var(--k-border); vertical-align: middle; }
.rank td.num, .rank th.num { text-align: right; font-family: var(--k-mono); font-variant-numeric: tabular-nums; }
.rank .pos { font: 800 13px var(--k-mono); color: var(--k-muted); width: 36px; }
.rank .nm { font-weight: 700; }
.rank .ins { display: block; font: 500 11px/1.4 var(--k-mono); color: var(--k-muted); margin-top: 2px; }
.up { color: #34d399; } .dn { color: #f87171; }
.table-scroll { overflow-x: auto; border: 1px solid var(--k-border); border-radius: 16px; background: var(--k-card); }
@media (max-width: 700px) {
  .rank thead { display: none; }
  .rank, .rank tbody, .rank tr, .rank td { display: block; width: 100%; }
  .rank tr { padding: 12px 14px; border-bottom: 1px solid var(--rule); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px 10px; }
  .rank td { padding: 0; border: 0; text-align: left !important; }
  .rank td.pos { display: none; }
  .rank td.nmcell { grid-column: 1 / -1; }
  .rank td[data-l]::before { content: attr(data-l); display: block; font: 700 9.5px/1.4 var(--k-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--k-muted); }
}

/* desks list (research + infrastructure) */
.desks { display: grid; border-top: 1px solid var(--rule); }
.desk { display: grid; gap: 6px 24px; padding: 22px 0; border-bottom: 1px solid var(--rule); color: inherit !important; }
@media (min-width: 860px) { .desk { grid-template-columns: 220px minmax(0, 1fr) 190px; align-items: baseline; } }
.desk .dn { font: 800 19px/1.25 var(--k-font); letter-spacing: -.02em; color: var(--k-text); }
.desk .dn small { display: block; margin-top: 4px; font: 700 10.5px/1.3 var(--k-mono); letter-spacing: .14em; text-transform: uppercase; }
.desk .dd { color: var(--k-text-2); font-size: 15px; }
.desk .dp { font: 600 13px/1.4 var(--k-mono); color: var(--k-text); }
.desk .dp span { display: block; color: var(--brand-hi); margin-top: 4px; }
@media (hover: hover) { a.desk:hover .dn { color: var(--brand-hi); } }

/* community */
.chan { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 16px; align-items: center; padding: 16px 18px; border-radius: 14px; background: var(--k-card); border: 1px solid var(--k-border); color: inherit !important; }
.chan .t { font-weight: 700; }
.chan .d { grid-column: 1; color: var(--k-text-2); font-size: 13.5px; }
.chan .c { grid-row: 1 / span 2; grid-column: 2; font: 700 12px/1.4 var(--k-mono); color: var(--k-text-2); text-align: right; }
.online { display: inline-flex; align-items: center; gap: 8px; font: 600 13px var(--k-mono); color: var(--k-text-2); }
.online i { width: 8px; height: 8px; border-radius: 50%; background: var(--k-green); box-shadow: 0 0 0 4px rgba(16, 185, 129, .15); }

/* prose (FAQ, legal, how-it-works) */
.prose { max-width: 760px; }
.prose h1 { font: 900 clamp(32px, 4.5vw, 48px)/1.1 var(--k-font); letter-spacing: -.04em; margin: 0 0 18px; }
.prose h2 { font: 800 22px/1.3 var(--k-font); letter-spacing: -.02em; margin: 40px 0 10px; }
.prose h3 { font: 700 17px/1.35 var(--k-font); margin: 26px 0 8px; }
.prose p, .prose li { color: var(--k-text-2); font-size: 15.5px; line-height: 1.7; }
.prose strong, .prose b { color: var(--k-text); }
.prose ul, .prose ol { padding-left: 22px; }
.prose a { text-decoration: underline; text-decoration-color: rgba(var(--brand-rgb), .4); text-underline-offset: 3px; }
.prose table { width: 100%; border-collapse: collapse; font-size: 14px; display: block; overflow-x: auto; }
.prose td, .prose th { border: 1px solid var(--rule); padding: 8px 10px; text-align: left; vertical-align: top; }
.legal-meta { font: 600 12px/1.6 var(--k-mono); color: var(--k-muted); border-left: 2px solid rgba(var(--brand-rgb), .5); padding: 6px 0 6px 12px; margin-bottom: 20px; }
.faq details { border-bottom: 1px solid var(--rule); padding: 4px 0; }
.faq summary { cursor: pointer; list-style: none; display: flex; gap: 14px; align-items: baseline; padding: 16px 0; font: 700 17px/1.4 var(--k-font); color: var(--k-text); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .q { font: 800 12px var(--k-mono); color: var(--k-muted); flex: none; }
.faq details p { margin: 0 0 18px 34px; color: var(--k-text-2); }
@media (max-width: 640px) { .faq details p { margin-left: 0; } }

/* steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; counter-reset: s; }
@media (min-width: 900px) { .steps.four { grid-template-columns: repeat(4, minmax(0, 1fr)); } .steps.three { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.steps li { counter-increment: s; padding: 22px; background: var(--k-card); border: 1px solid var(--k-border); border-radius: 16px; }
.steps li::before { content: "0" counter(s); display: block; font: 800 12px var(--k-mono); color: var(--brand-hi); letter-spacing: .1em; margin-bottom: 10px; }
.steps h3 { margin: 0 0 6px; font: 700 16.5px/1.3 var(--k-font); }
.steps p { margin: 0; color: var(--k-text-2); font-size: 14.5px; }
.code { display: inline-block; max-width: 100%; overflow-wrap: anywhere; padding: 2px 8px; border-radius: 6px; background: rgba(var(--brand-rgb), .12); border: 1px solid rgba(var(--brand-rgb), .25); font: 600 13px/1.6 var(--k-mono); color: var(--k-text); }

/* compare table (plans) */
.compare { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.compare th, .compare td { padding: 13px 12px; border-bottom: 1px solid var(--k-border); text-align: center; }
.compare th:first-child, .compare td:first-child { text-align: left; color: var(--k-text-2); }
.compare thead th { font: 700 11px/1.4 var(--k-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--k-text); vertical-align: bottom; }
.compare .y { color: var(--k-green); font-weight: 800; }
.compare .n { color: var(--k-muted); }
.compare .hi { background: rgba(var(--brand-rgb), .07); }

/* KXTL code chip */
.kxtl { display: inline-flex; align-items: center; gap: 10px; padding: 6px 6px 6px 14px; border-radius: 999px; border: 1px dashed rgba(245, 179, 74, .55); font: 800 15px var(--k-mono); letter-spacing: .12em; color: #ffd98a; }
.kxtl button { min-height: 34px; padding: 0 12px; border-radius: 999px; border: 0; background: rgba(245, 179, 74, .16); color: #ffe3a3; font: 700 12px var(--k-font); cursor: pointer; }

/* from-mql5 welcome */
.welcome { display: grid; gap: 24px; align-items: center; }
@media (min-width: 900px) { .welcome { grid-template-columns: 180px minmax(0, 1fr); } }
.welcome .big { width: 180px; height: 180px; border-radius: 34px; box-shadow: 0 30px 80px -30px rgba(var(--brand-rgb), .6); }
@media (max-width: 899px) { .welcome .big { width: 112px; height: 112px; border-radius: 24px; } }

/* two-col split used on several pages */
.split { display: grid; gap: 28px; }
@media (min-width: 900px) { .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: start; } }
.callout { padding: 22px; border-radius: 16px; border: 1px solid var(--rule); background: rgba(12, 20, 36, .6); }
.callout h3 { margin: 0 0 8px; }
.callout p { margin: 0; color: var(--k-text-2); font-size: 14.5px; }
.risk { color: var(--k-muted); font-size: 12.5px; line-height: 1.65; }
.cta-band { text-align: center; padding: 80px 0; background: radial-gradient(60% 80% at 50% 100%, rgba(var(--brand-rgb), .16), transparent 70%); border-top: 1px solid var(--k-border); }
.cta-band .k-h2 { max-width: 18ch; margin: 0 auto; }
.k-foot-grid { display: grid; gap: 28px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (min-width: 900px) { .k-foot-grid { grid-template-columns: 1.4fr repeat(4, minmax(0, 1fr)); } }
.sso-note { margin-top: 10px; font-size: 13px; color: var(--k-text-2); }
.sso-error { margin: 0; padding: 12px 16px; background: rgba(239, 68, 68, .1); border-bottom: 1px solid rgba(239, 68, 68, .35); color: #fecaca; font-size: 14px; text-align: center; }
.map .node text.core-t { font: 800 22px var(--k-font); fill: #fff; }
.lg-core { background: #e8ecf8; } .lg-tools { background: #818cf8; } .lg-learn { background: #f5b34a; } .lg-research { background: #22d3ee; } .lg-infra { background: #94a3b8; }
.foot-p { margin: 14px 0 0; max-width: 34ch; }
.foot-risk { max-width: 760px; }
.k-actions.left { justify-content: flex-start; }
.k-actions.mid { align-items: center; }
.mt8 { margin-top: 8px; } .mt18 { margin-top: 18px; } .center { text-align: center; }
.panel .grp { color: #e8ecf8; }

@media (max-width: 560px) { .nav-auth .k-nav-cta { display: none; } .k-brand .wm span { font-size: 14.5px; white-space: nowrap; } }
#universe { padding-top: 40px; }
.k-foot-list li { overflow-wrap: anywhere; min-width: 0; } .k-foot-grid > div { min-width: 0; }
.bundle [data-live="bundle-eq"] { margin-top: 18px; }
.rank td.old { color: #f5b34a; }

/* Convexa, live (the hub's own numbers) */
.cx { position: relative; margin: 8px 0 26px; padding: 22px; border-radius: 22px; border: 1px solid rgba(34, 211, 238, .22); overflow: hidden;
  background: radial-gradient(60% 80% at 100% 0%, rgba(34, 211, 238, .08), transparent 60%), var(--k-card); box-shadow: var(--k-shadow-card); }
@media (min-width: 900px) { .cx { padding: 32px; } }
.cx-top { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 10px 20px; }
.cx-tag { font: 700 11px/1.4 var(--k-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--k-cyan); }
.cx-title { margin: 8px 0 0; font: 800 clamp(22px, 2.6vw, 30px)/1.15 var(--k-font); letter-spacing: -.03em; }
.cx-scan { display: inline-flex; align-items: center; gap: 8px; font: 600 12px/1.3 var(--k-mono); color: var(--k-text-2); }
.cx-scan i { width: 8px; height: 8px; border-radius: 50%; background: #10b981; box-shadow: 0 0 0 3px rgba(16, 185, 129, .18); }
.cx-grid { display: grid; gap: 14px; margin-top: 20px; }
@media (min-width: 900px) { .cx-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.cx-col { min-width: 0; padding: 18px; border-radius: 16px; background: rgba(3, 7, 17, .45); border: 1px solid var(--k-border-2); }
.cx-h { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.cx-k { font: 800 18px/1.2 var(--k-font); letter-spacing: -.02em; }
.cx-h a { font-weight: 600; font-size: 14px; min-height: 44px; display: inline-flex; align-items: center; }
.cx-what { margin: 2px 0 0; color: var(--k-text-2); font-size: 14px; }
.cx-live { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--rule); }
.cx-big { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 6px; font-size: 13px; color: var(--k-text-2); }
.cx-big b { font: 800 22px/1.1 var(--k-mono); color: var(--k-text); font-variant-numeric: tabular-nums; }
.cx-big b.up, .cx-coin .up { color: #34d399; } .cx-big b.dn2, .cx-coin .dn2 { color: #f87171; }
.cx-big span + b { margin-left: 8px; }
.cx-bar { display: flex; height: 8px; margin-top: 10px; border-radius: 999px; overflow: hidden; background: rgba(148, 172, 216, .1); }
.cx-bar i { display: block; min-width: 0; }
.cx-bar .s-U { background: #10b981; } .cx-bar .s-u { background: rgba(16, 185, 129, .5); } .cx-bar .s-n { background: rgba(148, 172, 216, .25); }
.cx-bar .s-d { background: rgba(239, 68, 68, .5); } .cx-bar .s-D { background: #ef4444; }
.cx-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.cx-chip { padding: 3px 8px; border-radius: 6px; font: 700 11px/1.4 var(--k-mono); color: #a5f3fc; background: rgba(34, 211, 238, .1); border: 1px solid rgba(34, 211, 238, .3); }
.cx-coins { display: grid; gap: 4px; }
.cx-coin { display: grid; grid-template-columns: 56px minmax(0, 1fr) auto; gap: 8px; font: 600 13px/1.6 var(--k-mono); font-variant-numeric: tabular-nums; }
.cx-coin .p { color: var(--k-text-2); text-align: right; } .cx-coin .c { text-align: right; min-width: 64px; }
.cx-src { margin: 10px 0 0; font-size: 12.5px; line-height: 1.5; color: var(--k-muted); }
.cx-feat { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 6px; }
.cx-feat li { position: relative; padding-left: 16px; color: var(--k-text-2); font-size: 13.5px; line-height: 1.45; }
.cx-feat li::before { content: ""; position: absolute; left: 1px; top: .55em; width: 6px; height: 6px; border-radius: 50%; background: var(--k-cyan); }
.cx-foot { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px; margin-top: 20px; }
.cx-plan { font: 700 14px/1.5 var(--k-mono); color: var(--k-text); }
.cx .k-note { margin: 12px 0 0; }

/* =====================================================================================
   MAT Masterclass layer. Idea: the course shelf (12 modules as 12 volumes, spine height =
   words) on the MAT+ night; gold = the learning signal (the learn orbit colour of MAT Universe).
   Source: site/masterclass.css, appended to public/site.css by site/build.mjs.
   ===================================================================================== */
:root { --gold: #f5b34a; --gold-hi: #ffd98a; --gold-rgb: 245, 179, 74; --ok: #34d399; --bad: #f87171; --warn: #fbbf24; }
.mc-hero { position: relative; overflow: hidden; padding: 88px 0 40px; background:
  radial-gradient(70% 55% at 50% -5%, rgba(var(--gold-rgb), .13), transparent 62%),
  radial-gradient(40% 35% at 88% 12%, rgba(var(--brand-rgb), .12), transparent 60%), var(--k-bg); }
.mc-hero > .k-container { position: relative; z-index: 2; }
.mc-hero .k-h1 { margin-left: 0; max-width: 17ch; text-align: left; }
.mc-hero .k-lede { margin-left: 0; text-align: left; }
.mc-hero .k-actions { justify-content: flex-start; }
@media (max-width: 640px) { .mc-hero { padding: 48px 0 28px; } }
.k-hl-gold { background: linear-gradient(135deg, #ffe3a3 0%, #f5b34a 55%, #22d3ee 120%); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* FIG. 1 the shelf */
.shelf { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 6px; align-items: end; height: 260px; margin-top: 36px; padding: 0 4px; border-bottom: 3px solid rgba(var(--gold-rgb), .35); }
.vol { position: relative; display: flex; flex-direction: column; justify-content: space-between; min-width: 0; height: var(--h, 70%); padding: 10px 4px 8px; border-radius: 6px 6px 2px 2px; color: #fff !important; text-decoration: none;
  background: linear-gradient(90deg, rgba(255,255,255,.10), rgba(255,255,255,0) 30%, rgba(0,0,0,.25)), var(--c, #3b3f8f); box-shadow: inset 0 0 0 1px rgba(255,255,255,.08), 0 10px 24px -12px rgba(0,0,0,.8); transition: transform .3s var(--k-ease); }
.vol .vn { font: 800 12px/1 var(--k-mono); letter-spacing: .06em; opacity: .9; text-align: center; }
.vol .vt { writing-mode: vertical-rl; transform: rotate(180deg); font: 700 12.5px/1.1 var(--k-font); letter-spacing: .01em; margin: 8px auto; max-height: 70%; overflow: hidden; }
.vol .vw { font: 600 9.5px/1.2 var(--k-mono); text-align: center; opacity: .8; }
.vol .free { position: absolute; top: -22px; left: 50%; transform: translateX(-50%); font: 800 9.5px/1 var(--k-mono); letter-spacing: .1em; color: #0b1020; background: var(--gold); padding: 4px 6px; border-radius: 5px; white-space: nowrap; }
.vol.done::after { content: ""; position: absolute; left: 6px; right: 6px; bottom: 4px; height: 3px; border-radius: 2px; background: var(--ok); }
@media (hover: hover) { .vol:hover { transform: translateY(-8px); } }
@media (max-width: 640px) { .shelf { height: 200px; gap: 3px; } .vol .vt { font-size: 10px; } .vol .vw { display: none; } .vol .vn { font-size: 10px; } }
.mc-hero .fig { margin-top: 52px; }
.fig b { white-space: nowrap; }
.shelf-cap { margin-top: 10px; font: 600 11.5px/1.5 var(--k-mono); color: var(--k-muted); }

/* stat ribbon (true numbers only) */
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1px; margin-top: 34px; border: 1px solid var(--rule); border-radius: 16px; overflow: hidden; background: var(--rule); }
.facts > div { background: rgba(7, 11, 23, .92); padding: 14px 16px; }
.facts .v { display: block; font: 800 24px/1.1 var(--k-mono); letter-spacing: -.02em; color: var(--k-text); font-variant-numeric: tabular-nums; }
.facts .l { display: block; margin-top: 6px; color: var(--k-text-2); font-size: 12.5px; line-height: 1.4; }

/* value pillars */
.pillars { display: grid; gap: 14px; }
@media (min-width: 760px) { .pillars { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1140px) { .pillars { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.pillar { padding: 22px; border-radius: 18px; background: var(--k-card); border: 1px solid var(--k-border-2); min-width: 0; }
.pillar h3 { margin: 10px 0 6px; font: 800 18px/1.3 var(--k-font); letter-spacing: -.02em; }
.pillar p { margin: 0; color: var(--k-text-2); font-size: 14.5px; }
.pillar .measure { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--rule); font: 600 12px/1.5 var(--k-mono); color: var(--gold-hi); }
.pillar .measure b { color: var(--k-muted); font-weight: 700; letter-spacing: .1em; text-transform: uppercase; font-size: 10.5px; display: block; }
.pillar a.more { display: inline-block; margin-top: 12px; font-weight: 700; font-size: 14px; }

/* course list */
.modules { display: grid; gap: 14px; }
.module { border: 1px solid var(--k-border-2); border-radius: 18px; background: var(--k-card); overflow: hidden; }
.module > summary { list-style: none; cursor: pointer; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 4px 16px; align-items: center; padding: 18px 20px; }
.module > summary::-webkit-details-marker { display: none; }
.module .mn { font: 800 13px/1 var(--k-mono); color: var(--gold); width: 36px; }
.module .mt { font: 800 18px/1.3 var(--k-font); letter-spacing: -.02em; }
.module .ms { grid-column: 2; color: var(--k-text-2); font-size: 14px; }
.module .mp { grid-row: 1 / span 2; grid-column: 3; font: 700 12px var(--k-mono); color: var(--k-muted); text-align: right; }
.lessons { list-style: none; margin: 0; padding: 0 12px 12px; display: grid; gap: 6px; }
.lrow { display: grid; grid-template-columns: 26px minmax(0, 1fr) auto; gap: 2px 12px; align-items: center; padding: 12px; border-radius: 12px; color: inherit !important; background: rgba(255,255,255,.015); border: 1px solid transparent; }
.lrow:hover { border-color: var(--k-border-3); }
.lrow .st { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--k-border-3); }
.lrow.done .st { background: var(--ok); border-color: var(--ok); box-shadow: inset 0 0 0 3px var(--k-card); }
.lrow .lt { font-weight: 650; font-size: 15px; min-width: 0; }
.lrow .lm { grid-column: 2; font: 500 11.5px/1.4 var(--k-mono); color: var(--k-muted); }
.lrow .tag { grid-row: 1 / span 2; grid-column: 3; }
@media (max-width: 480px) { .lrow { grid-template-columns: 22px minmax(0, 1fr); } .lrow .tag { grid-row: auto; grid-column: 2; justify-self: start; } }
.vtag { display: inline-flex; align-items: center; padding: 4px 8px; border-radius: 999px; font: 800 10px/1.2 var(--k-mono); letter-spacing: .08em; text-transform: uppercase; white-space: nowrap; border: 1px solid; }
.vtag.proven { color: #6ee7b7; border-color: rgba(16,185,129,.4); background: rgba(16,185,129,.08); }
.vtag.neutral { color: var(--k-text-2); border-color: var(--k-border-3); }
.vtag.notsup { color: #fca5a5; border-color: rgba(239,68,68,.4); background: rgba(239,68,68,.06); }
.vtag.rewrite { color: #fcd34d; border-color: rgba(245,158,11,.4); background: rgba(245,158,11,.06); }
.vtag.lock { color: var(--gold-hi); border-color: rgba(var(--gold-rgb), .4); }

/* path stages */
.stages { display: grid; gap: 14px; counter-reset: st; }
.stage { position: relative; padding: 22px 22px 20px 64px; border-radius: 18px; background: var(--k-card); border: 1px solid var(--k-border-2); min-width: 0; }
.stage::before { counter-increment: st; content: counter(st); position: absolute; left: 20px; top: 20px; width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; font: 800 13px var(--k-mono); color: #0b1020; background: var(--gold); }
.stage.passed::before { content: "\2713"; background: var(--ok); }
.stage h3 { margin: 0; font: 800 19px/1.3 var(--k-font); letter-spacing: -.02em; }
.stage .sk { margin: 6px 0 0; color: var(--k-text-2); font-size: 14.5px; }
.stage .gate { margin-top: 12px; padding: 12px 14px; border-radius: 12px; background: rgba(var(--gold-rgb), .06); border: 1px dashed rgba(var(--gold-rgb), .35); font-size: 13.5px; color: var(--k-text); }
.stage .gate b { display: block; font: 800 10.5px/1.4 var(--k-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--gold-hi); margin-bottom: 4px; }
.stage .ls { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.stage .ls a { font: 600 12px/1 var(--k-mono); padding: 7px 9px; border-radius: 8px; border: 1px solid var(--k-border-3); color: var(--k-text-2) !important; }
.stage .ls a.done { border-color: rgba(16,185,129,.5); color: #6ee7b7 !important; }
.gate-state { margin-top: 10px; font: 600 12px/1.5 var(--k-mono); color: var(--k-muted); }
@media (max-width: 480px) { .stage { padding: 62px 18px 18px; } .stage::before { top: 18px; left: 18px; } }

/* lesson page */
.lesson-top { padding: 40px 0 8px; }
.crumb { font: 600 12px/1.5 var(--k-mono); color: var(--k-muted); }
.crumb a { color: var(--k-text-2) !important; }
.lesson-title { margin: 12px 0 0; font: 900 clamp(30px, 4.4vw, 48px)/1.08 var(--k-font); letter-spacing: -.04em; max-width: 24ch; }
.lesson-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 14px; font: 600 12.5px/1.5 var(--k-mono); color: var(--k-text-2); align-items: center; }
.lesson-grid { display: grid; gap: 28px; padding: 18px 0 64px; }
.lesson-grid > * { min-width: 0; }
.lesson-content > * { max-width: 100%; }
/* pages whose main block is filled from the API keep the space it will take (no layout shift) */
.fill { min-height: 100vh; }
[data-path-summary] { min-height: 3.4em; }
@media (min-width: 1100px) { .lesson-grid { grid-template-columns: minmax(0, 1fr) 300px; } .rail { align-self: start; } }
.lesson-content { min-width: 0; max-width: 780px; font-size: 16.5px; line-height: 1.75; color: #d6deea; }
.lesson-content > h1:first-child { display: none; }
.lesson-content h2 { margin: 44px 0 12px; font: 800 25px/1.25 var(--k-font); letter-spacing: -.025em; color: var(--k-text); scroll-margin-top: 80px; }
.lesson-content h3 { margin: 28px 0 8px; font: 750 19px/1.35 var(--k-font); color: var(--k-text); }
.lesson-content p, .lesson-content li { overflow-wrap: anywhere; }
.lesson-content strong { color: var(--k-text); }
.lesson-content a { color: var(--gold-hi) !important; text-decoration: underline; text-underline-offset: 3px; }
.lesson-content blockquote { margin: 18px 0; padding: 12px 16px; border-left: 3px solid var(--gold); background: rgba(var(--gold-rgb), .05); border-radius: 0 12px 12px 0; color: var(--k-text); }
.lesson-content hr { border: 0; height: 1px; background: var(--rule); margin: 32px 0; }
.lesson-content table { width: 100%; border-collapse: collapse; font-size: 14px; }
.lesson-content > table { display: block; overflow-x: auto; }
.lesson-content th, .lesson-content td { border: 1px solid var(--rule); padding: 8px 10px; text-align: left; vertical-align: top; }
.lesson-content pre { max-width: 100%; overflow-x: auto; }
.lesson-content img, .lesson-content svg { max-width: 100%; }
.lesson-content .table-container, .lesson-content .vc-ascii-chart { max-width: 100%; overflow-x: auto; }
.rail .box { padding: 18px; border-radius: 16px; background: var(--k-card); border: 1px solid var(--k-border-2); margin-bottom: 14px; }
.rail .box h3 { margin: 0 0 8px; font: 800 11px/1.4 var(--k-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--k-muted); }
.rail .box p { margin: 0; font-size: 14px; color: var(--k-text-2); }
.rail .box .k-btn { width: 100%; margin-top: 12px; }
.toc { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; max-height: 40vh; overflow: auto; }
.toc a { display: block; font-size: 13px; color: var(--k-text-2) !important; padding: 4px 0; }
.lock-panel { margin: 30px 0; padding: 28px; border-radius: 20px; border: 1px solid rgba(var(--gold-rgb), .35); background: radial-gradient(80% 90% at 100% 0%, rgba(var(--gold-rgb), .1), transparent 60%), var(--k-card); }
.lock-panel h2 { margin: 0 0 8px; font: 800 24px/1.25 var(--k-font); }
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 40px; }
.lesson-nav .k-btn { white-space: normal; text-align: left; max-width: 100%; min-height: 48px; height: auto; padding: 12px 18px; line-height: 1.3; }
.done-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 36px; padding: 18px; border-radius: 16px; background: var(--k-card); border: 1px solid var(--k-border-2); }
.done-bar .msg { flex: 1 1 220px; font-size: 14px; color: var(--k-text-2); }
.evidence { margin: 0 0 22px; padding: 16px 18px; border-radius: 14px; border: 1px solid rgba(239,68,68,.35); background: rgba(239,68,68,.05); font-size: 14.5px; color: var(--k-text); max-width: 780px; }
.evidence.ok { border-color: rgba(16,185,129,.35); background: rgba(16,185,129,.05); }
.evidence.neutral { border-color: var(--k-border-3); background: rgba(255,255,255,.02); }
.evidence b.h { display: block; font: 800 10.5px/1.4 var(--k-mono); letter-spacing: .12em; text-transform: uppercase; margin-bottom: 6px; color: var(--k-muted); }

/* cards and tiles (dashboard, journal) */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.tile { padding: 16px; border-radius: 16px; background: var(--k-card); border: 1px solid var(--k-border-2); min-width: 0; }
.tile .v { display: block; font: 800 24px/1.1 var(--k-mono); font-variant-numeric: tabular-nums; color: var(--k-text); overflow-wrap: anywhere; }
.tile .l { display: block; margin-top: 6px; font-size: 12.5px; color: var(--k-text-2); line-height: 1.4; }
.tile .s { display: block; margin-top: 4px; font: 500 10.5px/1.3 var(--k-mono); color: var(--k-muted); }
.tile.good .v { color: #6ee7b7; } .tile.bad .v { color: #fca5a5; }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.list li { padding: 14px 16px; border-radius: 14px; background: var(--k-card); border: 1px solid var(--k-border-2); font-size: 14.5px; min-width: 0; }
.list li b { color: var(--k-text); }
.list li .why { display: block; margin-top: 4px; color: var(--k-text-2); font-size: 13.5px; }
.list li a.go { display: inline-block; margin-top: 8px; font-weight: 700; font-size: 13.5px; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.data-table th { text-align: left; font: 700 10.5px/1.4 var(--k-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--k-muted); padding: 8px 10px; border-bottom: 1px solid var(--rule); white-space: nowrap; }
.data-table td { padding: 10px; border-bottom: 1px solid var(--k-border); font-variant-numeric: tabular-nums; }
.data-table td.num, .data-table th.num { text-align: right; font-family: var(--k-mono); }
.scroll-x { overflow-x: auto; max-width: 100%; }
.empty { padding: 22px; border-radius: 16px; border: 1px dashed var(--k-border-3); color: var(--k-text-2); font-size: 14.5px; }
.note-src { font: 500 11px/1.5 var(--k-mono); color: var(--k-muted); margin-top: 10px; overflow-wrap: anywhere; }
.two { display: grid; gap: 22px; }
@media (min-width: 960px) { .two { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
.sec-h { margin: 0 0 14px; font: 800 22px/1.25 var(--k-font); letter-spacing: -.02em; }
.pad { padding: 44px 0; }

/* practice: replay + drills */
.replay { padding: 20px; border-radius: 20px; background: var(--k-card); border: 1px solid var(--k-border-2); min-width: 0; }
.replay .q { font: 700 17px/1.4 var(--k-font); margin: 10px 0 0; }
.replay .ctx { margin-top: 6px; font: 600 12px/1.5 var(--k-mono); color: var(--k-text-2); }
.chartbox { position: relative; width: 100%; aspect-ratio: 16 / 8; margin-top: 14px; border-radius: 12px; background: #0a1122; border: 1px solid var(--k-border-2); overflow: hidden; }
.chartbox svg { display: block; width: 100%; height: 100%; }
.choices { display: grid; gap: 8px; margin-top: 14px; }
@media (min-width: 640px) { .choices { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.choice { min-height: 48px; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--k-border-3); background: rgba(255,255,255,.02); color: var(--k-text); font: 600 14.5px/1.35 var(--k-font); text-align: left; cursor: pointer; }
.choice:hover { border-color: rgba(var(--gold-rgb), .5); }
.choice.right { border-color: rgba(16,185,129,.7); background: rgba(16,185,129,.08); }
.choice.wrong { border-color: rgba(239,68,68,.6); background: rgba(239,68,68,.06); }
.feedback { margin-top: 14px; padding: 14px 16px; border-radius: 12px; background: rgba(var(--brand-rgb), .08); border: 1px solid rgba(var(--brand-rgb), .25); font-size: 14.5px; }
.card-drill { padding: 24px; border-radius: 20px; background: var(--k-card); border: 1px solid var(--k-border-2); min-height: 200px; }
.card-drill .cat { font: 700 11px/1.4 var(--k-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--k-muted); }
.card-drill .term { margin-top: 8px; font: 800 24px/1.2 var(--k-font); letter-spacing: -.02em; }
.card-drill .def { margin-top: 12px; color: var(--k-text-2); font-size: 15.5px; }
.grade { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

/* forms */
.form-grid { display: grid; gap: 14px; }
@media (min-width: 640px) { .form-grid.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.form-group { display: grid; gap: 6px; min-width: 0; }
.form-group.full { grid-column: 1 / -1; }
.form-label { font: 700 12px/1.3 var(--k-mono); letter-spacing: .06em; color: var(--k-text-2); }
.form-input, .form-select { width: 100%; min-height: 46px; padding: 10px 12px; border-radius: 12px; border: 1px solid var(--k-border-3); background: #0a1122; color: var(--k-text); font: 500 16px/1.4 var(--k-font); box-sizing: border-box; }
.form-input:focus, .form-select:focus { outline: 2px solid rgba(var(--gold-rgb), .5); outline-offset: 1px; }
.form-hint { font-size: 12.5px; color: var(--k-muted); }
.form-msg { min-height: 20px; font-size: 14px; margin: 10px 0 0; }
.form-msg.err { color: #fca5a5; } .form-msg.ok { color: #6ee7b7; }
.auth-card { max-width: 520px; margin: 0 auto; padding: 28px; border-radius: 22px; background: var(--k-card); border: 1px solid var(--k-border-2); box-shadow: var(--k-shadow-card); }
.auth-card h2 { margin: 0; font: 800 22px/1.3 var(--k-font); }
.auth-card p { color: var(--k-text-2); font-size: 14.5px; }
.or { display: flex; align-items: center; gap: 12px; margin: 22px 0; font: 700 11px var(--k-mono); color: var(--k-muted); letter-spacing: .12em; text-transform: uppercase; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--rule); }
.btn-block { width: 100%; }

/* case studies */
.cases { display: grid; gap: 16px; }
@media (min-width: 1000px) { .cases { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.case { padding: 20px; border-radius: 18px; background: var(--k-card); border: 1px solid var(--k-border-2); min-width: 0; }
.case .when { font: 700 11px/1.4 var(--k-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--k-muted); }
.case h3 { margin: 6px 0 4px; font: 800 19px/1.3 var(--k-font); letter-spacing: -.02em; }
.case .nums { display: flex; flex-wrap: wrap; gap: 6px 14px; font: 600 12.5px/1.5 var(--k-mono); color: var(--k-text-2); }
.case .rx { margin-top: 12px; }
.case .plan { margin-top: 12px; padding: 12px 14px; border-radius: 12px; border-left: 3px solid var(--gold); background: rgba(var(--gold-rgb), .05); font-size: 14px; color: var(--k-text); }
.case .plan b { display: block; font: 800 10.5px/1.4 var(--k-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--gold-hi); margin-bottom: 4px; }

/* calculators and glossary */
.calc-wrap { padding: 20px 0 64px; }
.calc-wrap h1 { font: 900 clamp(28px, 4vw, 44px)/1.1 var(--k-font); letter-spacing: -.04em; }
.chip-link { display: inline-flex; align-items: center; gap: 6px; padding: 8px 12px; border-radius: 999px; border: 1px solid var(--k-border-3); font: 600 12.5px var(--k-mono); color: var(--k-text-2) !important; }
.gloss { display: grid; gap: 10px; }
@media (min-width: 900px) { .gloss { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.gloss div { padding: 14px 16px; border-radius: 14px; background: var(--k-card); border: 1px solid var(--k-border-2); min-width: 0; }
.gloss dt { font-weight: 800; text-transform: capitalize; }
.gloss dd { margin: 4px 0 0; color: var(--k-text-2); font-size: 14.5px; }
.search { max-width: 420px; margin: 18px 0 22px; }
.grid-links { display: grid; gap: 12px; }
@media (min-width: 760px) { .grid-links { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1140px) { .grid-links { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.glink { display: block; padding: 18px; border-radius: 16px; background: var(--k-card); border: 1px solid var(--k-border-2); color: inherit !important; min-width: 0; }
.glink b { display: block; font: 800 16.5px/1.35 var(--k-font); color: var(--k-text); }
.glink span { display: block; margin-top: 6px; font-size: 14px; color: var(--k-text-2); }
.glink small { display: block; margin-top: 8px; font: 600 11px var(--k-mono); color: var(--k-muted); }
@media (hover: hover) { .glink:hover { border-color: rgba(var(--gold-rgb), .45); } }