/* Frameshift — Keyboard playground */
.kbp { position: relative; overflow: clip; isolation: isolate; }
.kbp__bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; background: var(--c-bg); }
.kbp__photo { filter: blur(22px) saturate(1.25) brightness(0.5); transform: scale(1.12); }
.kbp__shade { position: absolute; inset: 0; background: radial-gradient(ellipse at 50% 45%, transparent 10%, rgb(var(--c-bg-rgb) / 0.55) 70%), linear-gradient(180deg, rgb(var(--c-bg-rgb) / 0.85), transparent 22%, transparent 78%, rgb(var(--c-bg-rgb) / 0.9)); }
html[data-fx='full'][data-parallax] .kbp__photo { animation: kbp-drift 26s ease-in-out infinite alternate; }
@keyframes kbp-drift { to { transform: scale(1.2) translate3d(-1.5%, 1%, 0); } }

.kbp__app { display: block; }
.kbp__stage {
  position: relative;
  container-type: inline-size;
  padding: clamp(0.9rem, 2.4vw, 2rem);
  background: linear-gradient(160deg, rgb(255 255 255 / 0.06), rgb(255 255 255 / 0.015));
  border: 1px solid rgb(255 255 255 / 0.12);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  box-shadow: 0 30px 80px -30px rgb(0 0 0 / 0.8), inset 0 1px 0 rgb(255 255 255 / 0.1);
  overflow-x: auto;
  scrollbar-width: thin;
  outline-offset: 4px;
}
[data-corners='chamfer'] .kbp__stage { clip-path: polygon(var(--chamfer) 0, 100% 0, 100% calc(100% - var(--chamfer)), calc(100% - var(--chamfer)) 100%, 0 100%, 0 var(--chamfer)); }
.kbp__stage:focus-visible { outline: 2px solid var(--kc, var(--c-accent)); }
.kbp__stage:focus-within { border-color: rgb(var(--c-accent-rgb) / 0.55); }

/* ---------- Board ---------- */
.kbp__board {
  /* Board = key columns + the case padding on both sides; sized to the stage so keys never poke out of the case.
     A key is never smaller than 24 CSS px (WCAG 2.2 target size); on narrow phones the whole case pans sideways inside its stage. */
  --u: max(calc((100cqw - 2px) / (var(--cols, 18.5) + 0.56)), 24px);
  position: relative;
  box-sizing: border-box;
  inline-size: calc((var(--cols, 18.5) + 0.56) * var(--u));
  padding: calc(var(--u) * 0.28);
  margin-inline: auto;
  background: linear-gradient(180deg, #1a1d25, #0d0f14);
  border-radius: calc(var(--u) * 0.28);
  box-shadow: 0 calc(var(--u) * 0.5) calc(var(--u) * 1.2) -10px rgb(0 0 0 / 0.9), inset 0 1px 0 rgb(255 255 255 / 0.12), 0 0 0 1px #000;
  direction: ltr;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  --travel: calc(var(--u) * 0.075);
  --press-t: 70ms linear;
}
.kbp__board::after { /* underglow */
  content: '';
  position: absolute;
  inset: calc(var(--u) * 0.1);
  z-index: -1;
  border-radius: inherit;
  box-shadow: 0 0 calc(var(--u) * 2.4) calc(var(--u) * 0.2) color-mix(in srgb, var(--kc) 55%, transparent);
  opacity: calc(0.25 + var(--glow, 0.4) * 0.7);
  transition: box-shadow var(--dur-3);
}
.kbp__board[data-effect='wave']::after, .kbp__board[data-effect='breathing']::after { opacity: 0.55; }
.kbp__noscript { color: var(--c-muted); padding: 1rem; }
.kb-row { display: flex; block-size: var(--u); }
.kb-gap { flex: none; inline-size: calc(var(--w) * var(--u)); }
.kb-key { position: relative; flex: none; inline-size: calc(var(--w) * var(--u)); block-size: var(--u); padding: calc(var(--u) * 0.045); cursor: pointer; }
.kb-key__cap {
  position: absolute;
  inset: calc(var(--u) * 0.045);
  display: grid;
  place-items: center;
  border-radius: calc(var(--u) * 0.14);
  background: linear-gradient(180deg, #2b303b 0%, #1d2129 100%);
  box-shadow: 0 calc(var(--u) * 0.075) 0 #07080b, 0 calc(var(--u) * 0.1) calc(var(--u) * 0.08) rgb(0 0 0 / 0.55), inset 0 1px 0 rgb(255 255 255 / 0.14), inset 0 -2px 0 rgb(0 0 0 / 0.35);
  color: #9aa3b5;
  font-family: var(--font-mono);
  font-size: clamp(8px, calc(var(--u) * 0.3), 15px);
  font-weight: 600;
  line-height: 1;
  transform: translateY(0);
  transition: transform var(--press-t), box-shadow var(--press-t), filter 160ms;
  overflow: hidden;
}
.kb-key__cap::after { /* lighting layer */
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(ellipse at 50% 120%, var(--kc) 0%, transparent 70%);
  opacity: 0;
  pointer-events: none;
  mix-blend-mode: screen;
}
.kb-key__leg { position: relative; z-index: 1; pointer-events: none; }
.kb-key:hover .kb-key__cap { filter: brightness(1.18); }
.kb-key.is-down .kb-key__cap {
  transform: translateY(var(--travel));
  box-shadow: 0 calc(var(--u) * 0.02) 0 #07080b, 0 0 calc(var(--u) * 0.1) rgb(0 0 0 / 0.5), inset 0 1px 0 rgb(255 255 255 / 0.08), inset 0 -1px 0 rgb(0 0 0 / 0.3);
  filter: brightness(1.35);
  color: var(--kc);
}
.kb-key.is-down .kb-key__cap::after { opacity: 0.55; }

/* Lighting modes */
.kbp__board[data-effect='static'] .kb-key__cap { color: color-mix(in srgb, var(--kc) 82%, #fff 0%); box-shadow: 0 calc(var(--u) * 0.075) 0 #07080b, 0 calc(var(--u) * 0.1) calc(var(--u) * 0.08) rgb(0 0 0 / 0.55), inset 0 1px 0 rgb(255 255 255 / 0.14), inset 0 -2px 0 color-mix(in srgb, var(--kc) 55%, transparent); }
.kbp__board[data-effect='static'] .kb-key__cap::after { opacity: 0.22; }
.kbp__board[data-effect='reactive'] .kb-key__cap { color: #8f98aa; }
.kbp__board[data-effect='wave'] .kb-key__cap::after { opacity: 0.45; }
.kbp__board[data-effect='breathing'] .kb-key__cap { color: var(--kc); }
.kbp__board[data-effect='breathing'] .kb-key__cap::after { opacity: 0.3; }
html[data-fx='full'] .kbp__board[data-effect='wave'] .kb-key__cap { animation: kb-wave-txt 4.8s linear infinite; animation-delay: calc(var(--kx) * -4.8s); }
html[data-fx='full'] .kbp__board[data-effect='wave'] .kb-key__cap::after { animation: kb-wave 4.8s linear infinite; animation-delay: calc(var(--kx) * -4.8s); background: radial-gradient(ellipse at 50% 120%, currentColor 0%, transparent 72%); }
html[data-fx='full'] .kbp__board[data-effect='breathing'] .kb-key__cap::after { animation: kb-breathe 3.6s ease-in-out infinite; }
html[data-fx='full'] .kbp__board[data-effect='breathing']::after { animation: kb-breathe-glow 3.6s ease-in-out infinite; }
@keyframes kb-wave-txt { 0%, 100% { color: hsl(0 95% 62%); } 17% { color: hsl(55 95% 58%); } 33% { color: hsl(120 85% 55%); } 50% { color: hsl(185 95% 58%); } 67% { color: hsl(245 95% 70%); } 83% { color: hsl(310 90% 62%); } }
@keyframes kb-wave { 0%, 100% { opacity: 0.5; } 50% { opacity: 0.32; } }
@keyframes kb-breathe { 0%, 100% { opacity: 0.08; } 50% { opacity: 0.55; } }
@keyframes kb-breathe-glow { 0%, 100% { opacity: 0.18; } 50% { opacity: 0.75; } }
.kbp__board[data-effect='wave'] .kb-key.is-down .kb-key__cap { color: #fff; }

/* Switch feel */
.kbp__board[data-switch='linear'] { --travel: calc(var(--u) * 0.085); --press-t: 85ms linear; }
.kbp__board[data-switch='tactile'] { --travel: calc(var(--u) * 0.07); --press-t: 55ms cubic-bezier(0.3, 1.5, 0.5, 1); }
.kbp__board[data-switch='clicky'] { --travel: calc(var(--u) * 0.055); --press-t: 35ms steps(2, jump-end); }
html[data-fx='full'] .kbp__board[data-switch='tactile'] .kb-key.is-down .kb-key__cap { animation: kb-bump 130ms ease-out; }
html[data-fx='full'] .kbp__board[data-switch='clicky'] .kb-key.is-down .kb-key__cap { animation: kb-snap 110ms ease-out; }
@keyframes kb-bump { 0% { transform: translateY(0); } 45% { transform: translateY(calc(var(--travel) * 0.55)); } 62% { transform: translateY(calc(var(--travel) * 0.4)); } 100% { transform: translateY(var(--travel)); } }
@keyframes kb-snap { 0% { transform: translateY(0) scale(1); } 40% { transform: translateY(var(--travel)) scale(0.985); } 100% { transform: translateY(var(--travel)) scale(1); } }

.kbp__hint { display: flex; align-items: center; gap: 0.6rem; margin: clamp(0.9rem, 2vw, 1.4rem) 0 0; color: var(--c-muted); justify-content: center; text-align: center; }
.kbp__hint-dot { inline-size: 7px; block-size: 7px; border-radius: 50%; background: var(--c-accent); box-shadow: 0 0 10px var(--c-accent); flex: none; }
html[data-fx='full'] .kbp__hint-dot { animation: pulse 1.6s infinite; }
.kbp__stage:focus-within .kbp__hint-dot { background: var(--c-success); box-shadow: 0 0 10px var(--c-success); }

/* ---------- Panel ---------- */
.kbp__panel { display: grid; gap: clamp(1.25rem, 3vw, 2rem); margin-block-start: clamp(1.5rem, 3vw, 2.5rem); grid-template-columns: minmax(0, 1fr); align-items: start; }
@media (min-width: 990px) { .kbp__panel { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); } .kbp__product { grid-column: 2; grid-row: 1 / span 2; } }
@media (min-width: 990px) { .kbp__panel:not(:has(.kbp__product)) { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); } .kbp__panel:not(:has(.kbp__product)) .kbp__readout { grid-column: 2; grid-row: 1; } }
.kbp__controls { display: grid; gap: 1.4rem 2rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); padding: clamp(1.1rem, 2.4vw, 1.6rem); background: rgb(var(--c-bg-rgb) / 0.72); border: 1px solid var(--c-border); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.kbp__group { border: 0; padding: 0; margin: 0; min-inline-size: 0; display: grid; gap: 0.7rem; align-content: start; }
.kbp__group--wide { grid-column: 1 / -1; }
.kbp__group legend, .kbp__group > .label { padding: 0; color: var(--c-muted); }
.kbp__seg { display: flex; flex-wrap: wrap; border: 1px solid var(--c-border); background: var(--c-surface); padding: 3px; gap: 3px; inline-size: fit-content; max-inline-size: 100%; }
.kbp__seg-btn { min-block-size: 40px; padding: 0 1rem; font-family: var(--font-mono); font-size: var(--tiny); font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--c-muted); transition: color var(--dur-1), background var(--dur-1); }
.kbp__seg-btn:hover { color: var(--c-text); }
.kbp__seg-btn[aria-checked='true'] { background: var(--c-accent); color: var(--c-on-accent); }
.kbp__swatches { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.kbp__swatch { position: relative; inline-size: 40px; block-size: 40px; background: var(--sw); border-radius: 50%; box-shadow: 0 0 0 1px rgb(255 255 255 / 0.2); transition: transform var(--dur-2) var(--ease-snap), box-shadow var(--dur-2); }
.kbp__swatch:hover { transform: scale(1.1); }
.kbp__swatch[aria-checked='true'] { box-shadow: 0 0 0 3px var(--c-bg), 0 0 0 5px var(--sw), 0 0 22px var(--sw); }
.kbp__switch-note { margin: 0; font-size: var(--small); max-inline-size: 60ch; min-block-size: 3em; }
.kbp__sound .icon { display: none; }
.kbp__sound[aria-pressed='false'] .kbp__sound-off, .kbp__sound[aria-pressed='true'] .kbp__sound-on { display: block; }

.kbp__readout { display: grid; gap: 1.1rem; padding: clamp(1.1rem, 2.4vw, 1.6rem); background: rgb(var(--c-bg-rgb) / 0.72); border: 1px solid var(--c-border); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); align-content: start; }
.kbp__stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 0; }
.kbp__stats dd { margin: 0; font-family: var(--font-heading); font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1; color: var(--c-accent); font-variant-numeric: tabular-nums; }
.kbp__typed { display: grid; gap: 0.4rem; }
.kbp__out { display: block; min-block-size: 3.2em; padding: 0.75rem 0.9rem; background: var(--c-surface); border: 1px solid var(--c-border); font-family: var(--font-mono); font-size: var(--small); color: var(--c-text); overflow-wrap: anywhere; white-space: pre-wrap; }
.kbp__out:empty::before { content: attr(data-empty); color: var(--c-muted); }
.kbp__out:not(:empty)::after { content: ''; display: inline-block; inline-size: 0.5ch; block-size: 1.1em; margin-inline-start: 1px; vertical-align: text-bottom; background: var(--c-accent); }
html[data-fx='full'] .kbp__out:not(:empty)::after { animation: blink 1s steps(2) infinite; }
.kbp__clear { justify-self: start; }
.kbp__product { display: grid; gap: 0.8rem; max-inline-size: 360px; }