/* Finance Illustrated — the Aha Lab and the shared tool primitives (.w-*).
   The Lab is the one featured block on a lesson: a warm "margin" panel between two rules, with a red label.
   Everything inside is interface: Inter, tabular numbers, hairlines, no shadows, no coloured boxes.
   Widget files (/assets/widgets/<name>.css) may only use these tokens and classes prefixed with the widget name.
   Numbers never overflow: every readout is a size container and its value shrinks with the box (cqi). */

.aha { position: relative; margin: var(--s7) calc(50% - 50vw); padding: var(--s6) var(--gutter) var(--s7); background: var(--margin); border-top: var(--rule-strong); border-bottom: var(--rule); }
.aha-inner { max-width: var(--wide); margin-inline: auto; }
.aha-head { max-width: var(--measure); }
.aha-badge { display: inline-flex; align-items: center; gap: var(--s2); margin: 0 0 var(--s3); padding: 5px 10px 5px 8px; background: var(--brand); color: var(--on-ink); font: 700 var(--fs-eyebrow)/1.2 var(--font-ui); letter-spacing: var(--track-eyebrow); text-transform: uppercase; }
.aha-bulb { width: 16px; height: 16px; flex: none; background: currentColor; -webkit-mask: url("/assets/icons/bulb.svg") center/contain no-repeat; mask: url("/assets/icons/bulb.svg") center/contain no-repeat; }
.aha-title { font: 600 var(--fs-h2)/1.2 var(--font-head); letter-spacing: var(--track-head); margin: 0 0 var(--s3); color: var(--ink); }
.aha-task { font: 400 var(--fs-body)/1.55 var(--font-text); color: var(--ink); margin: 0 0 var(--s5); }
.aha-stage { position: relative; container-type: inline-size; background: var(--paper); border: var(--rule); padding: clamp(var(--s4), 3vw, var(--s6)); min-height: 120px; font: 400 var(--fs-ui)/var(--lh-ui) var(--font-ui); font-feature-settings: "cv05" 1; }
.aha-fallback { color: var(--ink-2); font-size: var(--fs-ui); }

/* The reveal. Locked until the widget calls api.reveal(); readers can still skip ahead. */
.aha-reveal { margin-top: var(--s5); max-width: var(--measure); }
.aha-moment { position: relative; margin: 0 0 var(--s3); font: 600 var(--fs-lead)/1.45 var(--font-head); color: var(--ink); }
.aha-moment strong { font-weight: 700; }
.aha-moment .mark, .aha-moment strong { background: linear-gradient(transparent 62%, var(--brand-wash) 62%); padding: 0 2px; }
.aha-explain { margin: 0; color: var(--ink-2); font-size: var(--fs-body); line-height: 1.55; }
.aha-result { margin: 0 0 var(--s3); font: 700 var(--fs-body)/1.5 var(--font-text); color: var(--ink); }
.aha-locked-note { display: none; }
.js .aha-reveal[data-state="locked"] > *:not(.aha-locked-note) { display: none; }
.js .aha-reveal[data-state="locked"] .aha-locked-note { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s3); margin: 0; color: var(--ink-2); font: 400 var(--fs-small)/1.4 var(--font-ui); }
.aha-skip { appearance: none; border: 0; background: none; padding: 10px 0; min-height: var(--tap); color: var(--ink); font: 700 var(--fs-small)/1.2 var(--font-ui); text-decoration: underline; text-decoration-color: var(--brand); text-decoration-thickness: 1.5px; text-underline-offset: 4px; cursor: pointer; }
.aha-reveal[data-state="open"] { animation: aha-pop .4s var(--ease) both; }
@keyframes aha-pop { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.aha-foot { margin: var(--s4) 0 0; color: var(--ink-3); font: 400 var(--fs-small)/1.5 var(--font-ui); }
.aha.was-collected .aha-badge::after { content: "Tried before"; margin-left: 4px; padding-left: 8px; border-left: 1px solid currentColor; }

/* Inside a tool every text is interface text */
.aha-stage p { font-size: inherit; line-height: inherit; margin: 0; }
.aha-stage .w-note { margin: var(--s3) 0 0; }
/* .w-stack spacing must beat the reset above, or paragraphs in a stack touch their neighbours */
.aha-stage .w-stack > * + * { margin-top: var(--s4); }
.w-seg-item input { pointer-events: none; }

/* ---------- shared primitives (.w-*) ---------- */
/* Visually hidden, still read aloud. Full width of its box and 1px tall (not 1px wide), so the sentence wraps
   normally instead of spilling sideways out of a 1px box. */
.w-sr { position: absolute; left: 0; right: 0; height: 1px; margin: 0; padding: 0; border: 0; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: normal; overflow-wrap: anywhere; pointer-events: none; }
.w-row { display: flex; flex-wrap: wrap; gap: var(--s4); align-items: flex-end; }
.w-grid { display: grid; gap: var(--s4); grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr)); }
.w-stack > * + * { margin-top: var(--s4); }
.w-label { display: block; font: 700 var(--fs-small)/1.3 var(--font-ui); color: var(--ink); }
.w-note { margin: var(--s3) 0 0; color: var(--ink-2); font: 400 var(--fs-small)/1.5 var(--font-ui); }
.w-field { display: grid; gap: var(--s2); justify-items: start; }
.w-num { font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Slider: black track, red thumb (the thing you move is the one red thing) */
.w-slider { display: grid; gap: var(--s1); align-content: end; min-width: min(100%, 15rem); flex: 1; }   /* end: side-by-side sliders keep their tracks level when one label wraps */
.w-slider-top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: var(--s1) var(--s3); }
.w-slider-top .w-label { flex: 1 1 8rem; }
.w-slider-value { font: 700 var(--fs-ui-lg)/1.25 var(--font-ui); font-variant-numeric: tabular-nums; color: var(--ink); text-align: right; overflow-wrap: anywhere; }
.w-slider-ends { display: flex; justify-content: space-between; color: var(--ink-3); font-size: var(--fs-small); }
.w-range { --fill: 50%; -webkit-appearance: none; appearance: none; width: 100%; height: var(--tap); background: transparent; margin: 0; cursor: pointer; }
.w-range::-webkit-slider-runnable-track { height: 4px; background: linear-gradient(to right, var(--ink) var(--fill), var(--line) var(--fill)); }
.w-range::-moz-range-track { height: 4px; background: var(--line); }
.w-range::-moz-range-progress { height: 4px; background: var(--ink); }
.w-range::-webkit-slider-thumb { -webkit-appearance: none; width: 24px; height: 24px; margin-top: -10px; border-radius: 50%; background: var(--brand); border: 2px solid var(--paper); outline: 1px solid var(--brand); }
.w-range::-moz-range-thumb { width: 20px; height: 20px; border-radius: 50%; background: var(--brand); border: 2px solid var(--paper); outline: 1px solid var(--brand); }
.w-range:focus-visible { outline: none; }
.w-range:focus-visible::-webkit-slider-thumb { box-shadow: var(--focus); }
.w-range:focus-visible::-moz-range-thumb { box-shadow: var(--focus); }

/* Buttons: square, ink. Red is kept for the page's main call to action, not for tools. */
.w-btn { appearance: none; display: inline-flex; align-items: center; justify-content: center; gap: var(--s2); min-height: var(--tap); padding: 10px 18px; border-radius: var(--r-sm); border: 1px solid var(--ink); background: var(--paper); color: var(--ink); font: 700 var(--fs-ui)/1.2 var(--font-ui); cursor: pointer; transition: background var(--dur); text-align: center; }
.w-btn:hover { background: var(--mist); }
.w-btn:active { transform: translateY(1px); }
.w-btn:focus-visible { outline: none; box-shadow: var(--focus); }
.w-btn[disabled] { opacity: .45; cursor: not-allowed; }
.w-btn--primary { background: var(--ink); color: var(--on-ink); }
.w-btn--primary:hover { background: var(--ink-2); }
.w-btn--up { border-color: var(--up); background: var(--up); color: var(--on-ink); }
.w-btn--up:hover { opacity: .9; }
.w-btn--down { border-color: var(--down); background: var(--down); color: var(--on-ink); }
.w-btn--down:hover { opacity: .9; }
.w-btn--ghost { border-color: var(--line-strong); }
.w-btn--small { min-height: var(--tap); padding: 6px 12px; font-size: var(--fs-small); }

/* Segmented control: a ruled row, the chosen option in ink */
.w-seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--ink); border-radius: var(--r-sm); background: var(--paper); max-width: 100%; }
.w-seg-item { position: relative; flex: 1 1 auto; }
.w-seg-item + .w-seg-item { border-left: 1px solid var(--ink); }
.w-seg-item input { position: absolute; opacity: 0; inset: 0; margin: 0; }
.w-seg-item label { display: flex; align-items: center; justify-content: center; min-height: var(--tap); padding: 8px 14px; font: 700 var(--fs-small)/1.2 var(--font-ui); color: var(--ink); cursor: pointer; text-align: center; }
.w-seg-item input:checked + label { background: var(--ink); color: var(--on-ink); }
.w-seg-item input:focus-visible + label { box-shadow: var(--focus); }

/* Readouts: a label over a number, under a hairline. No fills: the number's colour and sign carry the meaning.
   Each readout is a size container, so the number shrinks with its column instead of spilling out. */
.w-readout { container-type: inline-size; display: grid; align-content: start; gap: 2px; min-width: 0; padding: var(--s2) 0 0; border-top: var(--rule-strong); }
.w-readout-label { font: 700 var(--fs-small)/1.3 var(--font-ui); color: var(--ink-2); }
.w-readout-value { font: 700 var(--fs-num-fit)/1.15 var(--font-ui); font-variant-numeric: tabular-nums; letter-spacing: -0.01em; color: var(--ink); overflow-wrap: anywhere; }
.w-readout-note { font-size: var(--fs-small); color: var(--ink-3); }
.w-readout[data-tone="up"] .w-readout-value { color: var(--up); }
.w-readout[data-tone="down"] .w-readout-value { color: var(--down); }
.w-readout[data-tone="down"] { border-top-color: var(--down); }
.w-readout[data-tone="up"] { border-top-color: var(--up); }
.w-readout[data-tone="aha"] { border-top-color: var(--brand); } .w-readout[data-tone="aha"] .w-readout-value { color: var(--brand-ink); }

/* Cards you can pick, sort or swipe */
.w-card { position: relative; display: grid; gap: var(--s2); min-width: 0; padding: var(--s4); border: var(--rule); border-radius: var(--r-md); background: var(--paper); text-align: left; font: 400 var(--fs-ui)/1.45 var(--font-ui); color: var(--ink); overflow-wrap: anywhere; }
button.w-card { cursor: pointer; width: 100%; }
button.w-card:hover { border-color: var(--ink); }
.w-card:focus-visible { outline: none; box-shadow: var(--focus); }
.w-card[aria-pressed="true"], .w-card.is-selected { border-color: var(--ink); outline: 1px solid var(--ink); }
.w-card.is-right { border-color: var(--up); outline: 1px solid var(--up); background: var(--up-wash); }
.w-card.is-wrong { border-color: var(--down); outline: 1px solid var(--down); background: var(--down-wash); }
.w-card-title { font-weight: 700; }

/* Chips (draggable or tappable tokens) */
.w-chip { appearance: none; display: inline-flex; align-items: center; gap: 6px; min-height: var(--tap); padding: 8px 14px; border-radius: var(--r-pill); border: 1px solid var(--ink); background: var(--paper); color: var(--ink); font: 700 var(--fs-small)/1.2 var(--font-ui); cursor: grab; touch-action: none; user-select: none; max-width: 100%; overflow-wrap: anywhere; }
.w-chip.is-selected { background: var(--ink); color: var(--on-ink); }
.w-chip:focus-visible { outline: none; box-shadow: var(--focus); }
.w-bin { min-height: 120px; min-width: 0; padding: var(--s3); border: 1px dashed var(--line-strong); background: var(--canvas); display: flex; flex-wrap: wrap; align-content: flex-start; gap: var(--s2); }
.w-bin.is-target { border-style: solid; border-color: var(--ink); background: var(--margin); }

/* Charts */
.w-chart { display: block; width: 100%; height: auto; aspect-ratio: var(--chart-ratio, 16 / 7); overflow: visible; }
.w-line { stroke: var(--ink); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; fill: none; }
.w-line--up { stroke: var(--up); } .w-line--down { stroke: var(--down); } .w-line--muted { stroke: var(--line-strong); stroke-width: 1.5; }
.w-hline { stroke: var(--line-strong); stroke-width: 1; stroke-dasharray: 3 4; }
.w-hline--up { stroke: var(--up); stroke-dasharray: none; stroke-width: 1.5; } .w-hline--down { stroke: var(--down); stroke-dasharray: none; stroke-width: 1.5; }
.w-axis-label { font: 700 var(--fs-chart) var(--font-ui); fill: var(--ink-2); font-variant-numeric: tabular-nums; }
.w-area-up { fill: var(--up-wash); } .w-area-down { fill: var(--down-wash); }
.w-dot { fill: var(--ink); } .w-dot--aha { fill: var(--brand); stroke: var(--paper); stroke-width: 2; }

/* Tones for inline text */
.w-up { color: var(--up); font-weight: 700; } .w-down { color: var(--down); font-weight: 700; }
.w-tag { display: inline-flex; align-items: center; min-height: 26px; padding: 2px 8px; border-radius: var(--r-pill); border: var(--rule); background: var(--paper); font: 700 var(--fs-small)/1.2 var(--font-ui); color: var(--ink-2); }
.w-tag--up { border-color: var(--up); color: var(--up); } .w-tag--down { border-color: var(--down); color: var(--down); }

/* Meter bars: thin, square, ink */
.w-meter { height: 8px; background: var(--mist-2); overflow: hidden; }
.w-meter > span { display: block; height: 100%; width: var(--v, 0%); background: var(--ink); transition: width .35s var(--ease); }
.w-meter[data-tone="down"] > span { background: var(--down); } .w-meter[data-tone="up"] > span { background: var(--up); } .w-meter[data-tone="aha"] > span { background: var(--brand); }

@media (prefers-reduced-motion: reduce) {
  .aha-reveal[data-state="open"] { animation: none; }
  .w-meter > span, .w-btn { transition: none; }
}
@media (max-width: 40rem) {
  .aha { padding-block: var(--s5) var(--s6); }
  .aha-stage { padding: var(--s4) var(--s3); }
}