/* Touch controls — the on-screen rig built by src/input/touch.js.

   Three numbers come in from JS as custom properties on .touch and drive every
   moving part: --s (steering, -1..1), --gas and --brake (0..1). Nothing else is
   animated from script, so the whole overlay stays on the compositor and a
   frame costs at most three property writes.

   Sizes are in rem so the 44 px minimum touch target survives a user's larger
   default font, and clamped against vmin so a small phone in landscape does not
   end up with a wheel taller than the screen. */

.touch {
  position: absolute;
  inset: 0;
  pointer-events: none;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  font-family: var(--ui-font);

  --s: 0;
  --gas: 0;
  --brake: 0;

  --lock: 78deg;                                  /* fallback; touch.js sets this from settings.wheelLock */
  --wheel: clamp(8rem, 27vmin, 13rem);
  --travel: clamp(3rem, 10vw, 5rem);
  --pad: clamp(4.4rem, 15vmin, 6.6rem);
  --btn: clamp(2.75rem, 8vmin, 3.9rem);
  --edge: calc(0.6rem + var(--gap) * 0.4);

  --face: rgba(14, 17, 22, 0.52);
  --face-lit: rgba(28, 33, 41, 0.72);
}

.touch.is-hidden { display: none; }

/* Strip the UA button styling. :where() keeps this at zero specificity and it
   deliberately does not touch border, background or colour: an element reset
   that outranks the class styling below is how buttons end up as bare text. */
.touch :where(button) {
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
  padding: 0;
  font: inherit;
  touch-action: none;
  pointer-events: auto;
  cursor: default;
  outline: none;
}

/* Anything a thumb has to hit clears 44 px in both directions. */
.touch__btn,
.touch__hand,
.touch__pad,
.touch__chip {
  min-inline-size: 2.75rem;
  min-block-size: 2.75rem;
  display: grid;
  place-items: center;
  text-align: center;
  border-radius: var(--round);
  border: 1px solid var(--panel-edge);
  /* Deliberately a flat translucent fill and not backdrop-filter: blurring the
     backdrop means reading back the live 3D canvas underneath every control,
     every frame, which is a straight tax on the frame budget the game needs. */
  background: var(--face);
  color: var(--ink-dim);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  font-weight: 700;
  line-height: 1.1;
  transition: transform 0.08s ease, background-color 0.08s ease, color 0.08s ease, border-color 0.08s ease;
}

.touch__btn.is-on,
.touch__hand.is-on,
.touch__chip.is-on {
  transform: scale(0.94);
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

/* ---- steering ----------------------------------------------------------- */

.touch__steer {
  position: absolute;
  left: calc(var(--safe-l) + var(--edge));
  bottom: calc(var(--safe-b) + var(--edge));
  inline-size: clamp(10rem, 34vw, 17rem);
  block-size: clamp(8.5rem, 30vh, 13.5rem);
  display: grid;
  place-items: center;
  pointer-events: auto;
  touch-action: none;
}

/* In tilt mode the sensor owns steering, so the zone must not swallow a thumb
   that is only reaching for a chip. touch.js refuses steer grabs in tilt mode
   too — a stuck steering input is not something to leave to a stylesheet. */
.touch[data-layout="tilt"] .touch__steer { pointer-events: none; }
.touch[data-layout="tilt"] .touch__chip { pointer-events: auto; }

.touch__wheel,
.touch__slider,
.touch__cal { display: none; }

.touch[data-layout="wheel"] .touch__wheel { display: block; }
.touch[data-layout="slider"] .touch__slider,
.touch[data-layout="tilt"] .touch__slider { display: block; }
.touch[data-layout="tilt"] .touch__cal { display: flex; }

/* A refused or missing sensor drops tilt back to the slider — and takes the
   calibration block, and with it the line explaining what just happened, off
   screen. touch.js flags .has-note whenever there is something to say, so the
   message survives the layout switch that caused it. The chips are tilt-only
   and stay hidden: there is nothing to centre or invert on a slider. */
.touch.has-note .touch__cal { display: flex; }
.touch.has-note:not([data-layout="tilt"]) .touch__chip { display: none; }

/* --- the wheel --- */

.touch__wheel {
  position: relative;
  inline-size: var(--wheel);
  block-size: var(--wheel);
  transform: rotate(calc(var(--s) * var(--lock)));
  will-change: transform;
}

.touch__rim {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 0.62rem solid var(--face-lit);
  box-shadow:
    inset 0 0 0 1px var(--panel-edge),
    0 0 0 1px var(--panel-edge),
    0 0.4rem 1.4rem rgba(0, 0, 0, 0.35);
}

/* Three spokes, the classic open-bottom road wheel: two at the quarters and
   one straight down, so the rim's rotation is readable at a glance. */
.touch__spoke {
  position: absolute;
  left: 50%;
  top: 50%;
  inline-size: calc(var(--wheel) * 0.40);
  block-size: 0.42rem;
  border-radius: 0.21rem;
  background: var(--face-lit);
  box-shadow: inset 0 0 0 1px var(--panel-edge);
  transform-origin: 0 50%;
}
.touch__spoke--l { transform: translate(0, -50%) rotate(180deg); }
.touch__spoke--r { transform: translate(0, -50%) rotate(0deg); }
.touch__spoke--d { transform: translate(0, -50%) rotate(90deg); }

.touch__hub {
  position: absolute;
  left: 50%;
  top: 50%;
  inline-size: calc(var(--wheel) * 0.26);
  block-size: calc(var(--wheel) * 0.26);
  margin: calc(var(--wheel) * -0.13) 0 0 calc(var(--wheel) * -0.13);
  border-radius: 50%;
  background: var(--face-lit);
  box-shadow: inset 0 0 0 1px var(--panel-edge);
}

/* Twelve o'clock marker: the only thing that tells you how much lock you have. */
.touch__mark {
  position: absolute;
  left: 50%;
  top: 0.28rem;
  inline-size: 0.34rem;
  block-size: 0.9rem;
  margin-left: -0.17rem;
  border-radius: 0.17rem;
  background: var(--accent);
  opacity: 0.85;
}

.touch__steer.is-on .touch__rim {
  border-color: rgba(255, 176, 32, 0.30);
  box-shadow:
    inset 0 0 0 1px rgba(255, 176, 32, 0.45),
    0 0 0 1px rgba(255, 176, 32, 0.35),
    0 0.4rem 1.6rem rgba(0, 0, 0, 0.4);
}

/* --- the slider, which doubles as the tilt read-out --- */

.touch__slider {
  position: relative;
  inline-size: calc(var(--travel) * 2 + 3.4rem);
  block-size: 3.4rem;
}

.touch__track {
  position: absolute;
  inset: 50% 0 auto 0;
  block-size: 0.5rem;
  margin-block-start: -0.25rem;
  border-radius: 0.25rem;
  background: var(--face);
  box-shadow: inset 0 0 0 1px var(--panel-edge);
}

.touch__notch {
  position: absolute;
  left: 50%;
  top: 50%;
  inline-size: 0.14rem;
  block-size: 1.3rem;
  margin: -0.65rem 0 0 -0.07rem;
  border-radius: 0.07rem;
  background: var(--ink-faint);
}

.touch__knob {
  position: absolute;
  left: 50%;
  top: 50%;
  inline-size: 3.1rem;
  block-size: 3.1rem;
  border-radius: 50%;
  background: var(--face-lit);
  box-shadow:
    inset 0 0 0 1px var(--panel-edge),
    0 0.3rem 1rem rgba(0, 0, 0, 0.35);
  transform: translate(-50%, -50%) translateX(calc(var(--s) * var(--travel)));
  will-change: transform;
}
.touch__knob::after {
  content: "";
  position: absolute;
  inset: 0.9rem;
  border-radius: 50%;
  background: var(--accent);
  opacity: calc(0.25 + 0.75 * max(var(--s), calc(-1 * var(--s))));
}

.touch__steer.is-on .touch__knob { box-shadow: inset 0 0 0 1px var(--accent), 0 0.3rem 1rem rgba(0, 0, 0, 0.4); }

/* --- tilt calibration --- */

.touch__cal {
  position: absolute;
  inset-block-end: 0;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: center;
  inline-size: 100%;
}

.touch__chip {
  padding: 0 0.8rem;
  font-size: 0.68rem;
}

.touch__note {
  flex: 1 0 100%;
  margin: 0;
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-align: center;
  color: var(--ink-faint);
  min-block-size: 1.1em;
}

/* ---- pedals ------------------------------------------------------------- */

.touch__pads {
  position: absolute;
  right: calc(var(--safe-r) + var(--edge));
  bottom: calc(var(--safe-b) + var(--edge));
  display: flex;
  align-items: flex-end;
  gap: 0.55rem;
}

.touch__pad {
  position: relative;
  inline-size: var(--pad);
  block-size: calc(var(--pad) * 1.16);
  overflow: hidden;
  font-size: 0.74rem;
}

/* The fill is how much pedal you actually have on. Sliding a thumb down the
   pad eases off (see featherAt in touch.js), and without a visible level that
   gesture would just feel like the throttle randomly losing interest. */
.touch__pad::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  block-size: calc(var(--fill, 0) * 100%);
  background: var(--tint);
  opacity: 0.9;
}
.touch__pad span { position: relative; }

.touch__pad--gas   { --fill: var(--gas);   --tint: var(--good); }
.touch__pad--brake { --fill: var(--brake); --tint: var(--bad); }

.touch__pad.is-on {
  transform: scale(0.97);
  border-color: rgba(255, 255, 255, 0.24);
  color: var(--ink);
}

.touch__hand {
  inline-size: calc(var(--pad) * 0.82);
  block-size: calc(var(--pad) * 0.82);
  font-size: 0.64rem;
}

/* ---- camera, horn, look ------------------------------------------------- */

.touch__aux {
  position: absolute;
  right: calc(var(--safe-r) + var(--edge));
  bottom: calc(var(--safe-b) + var(--edge) + var(--pad) * 1.16 + 0.55rem);
  display: flex;
  gap: 0.5rem;
}

.touch__btn {
  inline-size: var(--btn);
  block-size: var(--btn);
  font-size: 0.64rem;
}

/* ---- shape for small and portrait screens ------------------------------- */

/* Portrait puts the road up top and the controls in the bottom third, so the
   rig can afford to be bigger and sit further from the home indicator.

   400-odd px of width will not take a wheel, three aux keys, a handbrake and
   two pedals in one row — measured at 390 px, the aux keys and the handbrake
   both landed on top of the steer zone. They fold into a 2x2 block above the
   pedals instead, which keeps the wheel full size and every target clear of
   it. The handbrake fills the block's fourth cell: .touch__pads is its
   containing block, and both are anchored to the same right edge, so aligning
   it to the pedals' top-right corner drops it exactly into the gap. */
@media (orientation: portrait) {
  .touch {
    --wheel: clamp(7.5rem, 34vw, 11rem);
    --pad: clamp(4.2rem, 20vw, 6rem);
  }
  .touch__steer {
    block-size: clamp(8rem, 22vh, 12rem);
    inline-size: clamp(9rem, 44vw, 14rem);
  }
  .touch__aux {
    display: grid;
    grid-template-columns: repeat(2, var(--btn));
    gap: 0.5rem;
  }
  .touch__hand {
    position: absolute;
    right: 0;
    bottom: calc(100% + 0.55rem);
    inline-size: var(--btn);
    block-size: var(--btn);
    font-size: 0.56rem;
  }
}

/* Landscape on a small phone: every rem counts, and the wheel is the first
   thing that has to give. */
@media (orientation: landscape) and (max-height: 26rem) {
  .touch {
    --wheel: clamp(6.5rem, 34vh, 9rem);
    --pad: clamp(3.6rem, 19vh, 5rem);
    --btn: 2.75rem;
    --edge: 0.5rem;
  }
  .touch__steer {
    inline-size: clamp(8rem, 28vw, 12rem);
    block-size: clamp(7rem, 44vh, 10rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .touch__btn, .touch__hand, .touch__pad, .touch__chip { transition: none; }
}