@font-face { font-family: "Atkinson Hyperlegible"; src: url("fonts/AtkinsonHyperlegible-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Atkinson Hyperlegible"; src: url("fonts/AtkinsonHyperlegible-Bold.ttf") format("truetype"); font-weight: 700; font-display: swap; }

:root {
  --bg: #0e1016; --card: #161a23; --card2: #1c212c; --line: #2a3140;
  --text: #e8ecf3; --dim: #9aa4b5; --a: #ff7a6b; --b: #3fd6a0; --warn: #ff4d5e;
  --r: 14px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.5 "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif; }
.wrap { max-width: 720px; margin: 0 auto; padding: 24px 16px 40px; }
h1 { font-size: 1.7rem; line-height: 1.2; margin: 0 0 12px; letter-spacing: -0.01em; }
h2 { font-size: 1.25rem; margin: 0; line-height: 1.2; }
p { margin: 0 0 10px; }
a { color: #8cc2ff; }
code { font: 0.86em ui-monospace, SFMono-Regular, Menlo, monospace; background: #232937; padding: 1px 5px; border-radius: 4px; }
.ca { color: var(--a); } .cb { color: var(--b); }
.page-head p { color: #c9d0dc; }
.note { font-size: 0.9rem; color: var(--dim) !important; }
.toc { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 14px 0 0; }
.toc a { display: block; padding: 4px 10px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); color: var(--text); text-decoration: none; font-size: 0.88rem; }
.toc a:hover { border-color: #4a5468; }
.page-foot { margin-top: 28px; font-size: 0.85rem; color: var(--dim); }
.page-foot p { color: var(--dim); }

/* ---- card ---- */
.trick { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 16px; margin: 22px 0; scroll-margin-top: 12px; }
.trick.target { border-color: #4f6fa8; }
.trick-head { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 12px; }
.trick-num { flex: none; width: 30px; height: 30px; border-radius: 50%; background: #262d3b; display: grid; place-items: center; font-weight: 700; font-size: 0.95rem; }
.lede { margin: 4px 0 0; color: #c3cad6; font-size: 0.97rem; }

/* ---- transport ---- */
.bar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
.btn { font: inherit; font-size: 0.92rem; color: var(--text); background: var(--card2); border: 1px solid var(--line); border-radius: 9px; padding: 7px 12px; cursor: pointer; line-height: 1.2; touch-action: manipulation; -webkit-user-select: none; user-select: none; }
.btn:hover { border-color: #4a5468; }
.btn:active, .btn.down { transform: translateY(1px); background: #262d3b; }
.btn:focus-visible, .seg button:focus-visible, .start-overlay:focus-visible { outline: 2px solid #8cc2ff; outline-offset: 2px; }
.btn.primary { background: #e8ecf3; color: #10131a; border-color: #e8ecf3; font-weight: 700; min-width: 84px; }
.btn.primary:hover { background: #fff; }
.seg { display: inline-flex; align-items: center; margin-left: auto; background: var(--card2); border: 1px solid var(--line); border-radius: 9px; padding: 2px; }
.seg-label { font-size: 0.78rem; color: var(--dim); padding: 0 6px 0 8px; }
.seg button { font: inherit; font-size: 0.84rem; color: var(--dim); background: none; border: 0; border-radius: 7px; padding: 5px 9px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: #2d3546; color: var(--text); }
.seg button[data-l="0"][aria-pressed="true"] { color: var(--a); }
.seg button[data-l="1"][aria-pressed="true"] { color: var(--b); }

/* ---- sides ---- */
.sides { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.side { min-width: 0; background: #11141b; border: 1.5px solid var(--line); border-radius: 11px; padding: 10px; transition: border-color 0.2s, box-shadow 0.2s; }
.side-a { --acc: var(--a); } .side-b { --acc: var(--b); }
.side.is-hearing { border-color: var(--acc); box-shadow: 0 0 0 3px color-mix(in srgb, var(--acc) 18%, transparent); }
.side-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; min-height: 22px; }
.side-name { font-weight: 700; color: var(--acc); text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.82rem; }
.hearing { display: inline-flex; align-items: center; gap: 4px; font-size: 0.74rem; color: var(--acc); opacity: 0; transition: opacity 0.2s; text-transform: uppercase; letter-spacing: 0.05em; }
.hearing svg { width: 15px; height: 15px; }
.is-hearing .hearing { opacity: 1; }
canvas { display: block; width: 100%; }
.chart { height: 118px; cursor: pointer; }
.spec { height: 50px; margin-top: 6px; }
.meter { height: 22px; margin-top: 8px; }
.readout { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; font-size: 0.8rem; color: var(--dim); margin-top: 4px; font-variant-numeric: tabular-nums; min-height: 1.3em; }
.readout b { color: var(--text); }
.clip { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em; padding: 0 5px; border-radius: 4px; border: 1px solid #3a2a30; color: #6b4a52; }
.clip.on { background: var(--warn); border-color: var(--warn); color: #fff; }
.cap { margin: 8px 0 0; font-size: 0.92rem; line-height: 1.4; min-height: 4.2em; color: var(--text); }
.cap.flash { animation: flash 0.6s ease-out; }
@keyframes flash { from { color: var(--acc); } to { color: var(--text); } }
.measured { margin: 6px 0 0; font-size: 0.76rem; color: var(--dim); border-top: 1px dashed var(--line); padding-top: 6px; }

.start-overlay { position: absolute; inset: 0; display: flex; flex-direction: column; gap: 6px; align-items: center; justify-content: center; font: inherit; color: var(--text); background: rgba(14,16,22,0.55); border: 0; border-radius: 11px; cursor: pointer; font-size: 0.95rem; }
.start-overlay .big { width: 58px; height: 58px; border-radius: 50%; background: #e8ecf3; color: #10131a; display: grid; place-items: center; font-size: 1.5rem; padding-left: 4px; box-shadow: 0 6px 24px rgba(0,0,0,0.5); transition: transform 0.15s; }
.start-overlay .pill { background: #0e1016; border: 1px solid var(--line); padding: 4px 12px; border-radius: 999px; }
.start-overlay:hover .big { transform: scale(1.06); }
.running .start-overlay, .trying .start-overlay { display: none; }

/* ---- try it ---- */
.try { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 12px; }
.try-title { font-size: 0.85rem; color: var(--dim); }
.sliders { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; width: 100%; font-size: 0.85rem; color: var(--dim); }
.sliders label { display: inline-flex; align-items: center; gap: 6px; color: var(--text); }
.sliders input { width: 110px; accent-color: var(--b); }
.sliders output { width: 3.2em; color: var(--dim); font-variant-numeric: tabular-nums; }
.how { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 8px; font-size: 0.9rem; color: #c3cad6; }
.how summary { cursor: pointer; color: var(--dim); font-size: 0.88rem; }
.how p, .how ul { margin: 8px 0 0; }
.how ul { padding-left: 20px; }

/* ---- solo (?trick=id&solo): just the card, edge to edge, for iframes ---- */
.solo body { background: var(--card); }
.solo .page-head, .solo .page-foot { display: none; }
.solo .wrap { padding: 0; max-width: none; }
.solo .trick { margin: 0; border: 0; border-radius: 0; }

/* ---- narrow screens ---- */
@media (max-width: 560px) {
  .wrap { padding: 16px 10px 32px; }
  h1 { font-size: 1.4rem; }
  .trick { padding: 12px 10px; }
  .sides { gap: 6px; }
  .side { padding: 7px; }
  .seg { margin-left: 0; }
  .chart { height: 100px; }
  .cap { font-size: 0.84rem; min-height: 6em; }
  .readout { font-size: 0.72rem; }
  .side-name { font-size: 0.74rem; }
  .hearing span { display: none; }
}
@media (max-width: 380px) {
  .seg-label { display: none; }
  .btn { padding: 7px 10px; }
}