:root {
  --bg: #0f1020;
  --panel: #1a1c2c;
  --panel-2: #262b44;
  --frame: #333c57;
  --ink: #f4f4f4;
  --muted: #94b0c2;
  --dim: #566c86;
  --green: #38b764;
  --lime: #a7f070;
  --teal: #257179;
  --yellow: #ffcd75;
  --orange: #ef7d57;
  --red: #b13e53;
  --red-ink: #ff5d6c;
  --blue: #41a6f6;
  --cyan: #73eff7;
  --purple: #5d275d;
  --op-plus: var(--lime);
  --op-minus: var(--blue);
  --op-times: var(--orange);
  --op-div: var(--cyan);
  --p: 4px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}

body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 16px;
  font-family: 'Press Start 2P', ui-monospace, 'Courier New', monospace;
  font-size: 12px;
  line-height: 1.6;
  -webkit-font-smoothing: none;
  background-image: radial-gradient(#1a1c2c 1px, transparent 1px);
  background-size: 8px 8px;
}

.app {
  width: min(100%, 460px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.screen { display: flex; flex-direction: column; gap: 12px; }

.px {
  background: var(--panel);
  margin: var(--p);
  box-shadow:
    0 calc(var(--p) * -1) 0 0 var(--frame),
    0 var(--p) 0 0 var(--frame),
    calc(var(--p) * -1) 0 0 0 var(--frame),
    var(--p) 0 0 0 var(--frame);
}

.pxnum {
  --px: 2px;
  display: inline-block;
  line-height: 0;
  vertical-align: -0.15em;
}
.pxnum svg { display: block; fill: currentColor; overflow: visible; }
.px-text .pxnum { margin: 0 0.1em; }

.logo {
  margin: 4px 0 0;
  text-align: center;
  font-size: clamp(22px, 7vw, 34px);
  font-weight: normal;
  letter-spacing: 2px;
}
.logo-a { color: var(--yellow); text-shadow: 4px 4px 0 var(--orange); }
.logo-b { color: var(--cyan); text-shadow: 4px 4px 0 var(--teal); margin-left: 0.4em; }

.intro {
  margin: var(--p);
  padding: 12px;
  font-size: 10px;
  line-height: 2;
  color: var(--muted);
  text-align: center;
}
.intro .pxnum { color: var(--ink); }

.levels { display: grid; gap: 8px; }
.level {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas: "name best" "desc desc";
  gap: 8px 12px;
  align-items: center;
  text-align: left;
  padding: 14px 16px;
}
.lv-name { grid-area: name; font-size: 16px; color: var(--yellow); }
.lv-desc { grid-area: desc; font-size: 10px; color: var(--muted); }
.lv-desc .pxnum { color: var(--ink); }
.lv-best { grid-area: best; font-size: 8px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.lv-best b { color: var(--lime); font-weight: normal; }
.lv-best .pxnum { --px: 2px; }

.rules {
  list-style: none;
  margin: var(--p);
  padding: 12px;
  display: grid;
  gap: 10px;
  font-size: 9px;
  line-height: 1.9;
}
.rules li { display: flex; align-items: center; gap: 10px; }
.icon {
  flex: none;
  width: 48px;
  height: 30px;
  display: grid;
  place-items: center;
  color: var(--panel);
}
.icon .pxnum { --px: 2px; margin: 0; }
.icon.t { background: var(--yellow); }
.icon.o { background: var(--orange); }
.icon.n { background: var(--ink); }
.icon.p { background: var(--cyan); }
.icon.h { background: var(--lime); font-size: 12px; }

.menu-bottom { display: flex; justify-content: center; }

.hud { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 8px 4px;
  min-width: 0;
}
.label { font-size: 8px; color: var(--muted); }
.value { color: var(--yellow); min-height: 21px; display: flex; align-items: center; }
.value .pxnum { --px: 3px; }

.task {
  padding: 12px 14px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.task > .label { align-self: flex-start; }
.target { color: var(--yellow); min-height: 70px; display: grid; place-items: center; }
.target .pxnum { --px: 10px; filter: drop-shadow(5px 5px 0 var(--orange)); }
.task-foot {
  align-self: stretch;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
}
.task-part { display: flex; flex-direction: column; gap: 6px; }
.task-part:last-child { align-items: flex-end; }
.task-ops { display: flex; gap: 6px; }
.op-badge {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  color: var(--panel);
  background: var(--c);
  box-shadow: inset -3px -3px 0 rgba(0, 0, 0, 0.3);
}
.op-badge .pxnum { --px: 4px; }
.task-count {
  height: 36px;
  min-width: 36px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--panel);
  box-shadow: inset -3px -3px 0 rgba(0, 0, 0, 0.3);
}
.task-count .pxnum { --px: 4px; }

[data-op="+"] { --c: var(--op-plus); }
[data-op="-"] { --c: var(--op-minus); }
[data-op="*"] { --c: var(--op-times); }
[data-op="/"] { --c: var(--op-div); }

.lcd {
  position: relative;
  background: #0b0c18;
  padding: 14px 10px 10px;
}
.lcd::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(0, 0, 0, 0.18) 0 2px, transparent 2px 4px);
}

.slots {
  --sz: 6px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  min-height: calc(var(--sz) * 7 + 20px);
}
.slots[data-count="4"] { --sz: 5px; }
.slots[data-count="5"] { --sz: 4px; }

.slot {
  display: grid;
  place-items: center;
  height: calc(var(--sz) * 7 + 16px);
  background: var(--panel-2);
  color: var(--panel);
}
.slot .pxnum { --px: var(--sz); }
.slot.num {
  width: calc(var(--sz) * 5 + 16px);
  border-bottom: var(--p) solid var(--dim);
}
.slot.op {
  width: calc(var(--sz) * 5 + 8px);
  height: calc(var(--sz) * 5 + 8px);
  background: transparent;
  box-shadow: inset 0 0 0 2px var(--panel-2);
}
.slot.cursor { animation: cursor 1s steps(1) infinite; }
.slot.num.filled { background: var(--yellow); border-bottom-color: var(--orange); }
.slot.op.filled { background: var(--c); box-shadow: inset -3px -3px 0 rgba(0, 0, 0, 0.3); }
.slot.new { animation: pop 0.2s steps(2); }
.slots.win .slot.num.filled { background: var(--lime); border-bottom-color: var(--green); }
.slots.win .slot { animation: hop 0.5s steps(2) calc(var(--i) * 50ms) both; }
.slots.wrong .slot.num.filled { background: var(--red-ink); border-bottom-color: var(--red); }
.slots.wrong { animation: shake 0.3s steps(3); }
.slots.reveal .slot.num.filled { background: var(--muted); border-bottom-color: var(--dim); }

.lcd-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
  min-height: 28px;
}
.result { color: var(--ink); flex: none; }
.result .pxnum { --px: 4px; }
.result.good { color: var(--lime); }
.result.bad { color: var(--red-ink); }
.message {
  margin: 0;
  font-size: 9px;
  line-height: 1.8;
  text-align: right;
  color: var(--muted);
}
.message.good { color: var(--lime); }
.message.bad { color: var(--red-ink); }
.message.shake { animation: shake 0.3s steps(3); }
.hint {
  margin: 10px 0 0;
  padding-top: 8px;
  border-top: 2px dashed var(--panel-2);
  font-size: 9px;
  color: var(--yellow);
}
.hint .pxnum { --px: 3px; }

@keyframes pop { 0% { transform: scale(1.2); } }
@keyframes hop { 50% { transform: translateY(-6px); } }
@keyframes shake {
  33% { transform: translateX(-4px); }
  66% { transform: translateX(4px); }
}
@keyframes cursor { 50% { box-shadow: inset 0 0 0 2px var(--yellow); } }

.btn {
  font: inherit;
  font-size: 10px;
  color: var(--ink);
  background: var(--panel-2);
  border: 0;
  padding: 10px 12px;
  margin: var(--p);
  cursor: pointer;
  box-shadow:
    0 calc(var(--p) * -1) 0 0 var(--frame),
    0 var(--p) 0 0 var(--frame),
    calc(var(--p) * -1) 0 0 0 var(--frame),
    var(--p) 0 0 0 var(--frame),
    inset -3px -3px 0 0 rgba(0, 0, 0, 0.35),
    inset 3px 3px 0 0 rgba(255, 255, 255, 0.12);
  user-select: none;
}
.btn:hover { background: var(--frame); }
.btn:active, .btn.down { transform: translate(2px, 2px); }
.btn:focus-visible { outline: 3px solid var(--blue); outline-offset: 6px; }
.btn:disabled { cursor: default; transform: none; }
.btn[aria-pressed="false"] { color: var(--dim); }
.btn-go { background: var(--green); color: var(--panel); }
.btn-go:hover { background: var(--lime); }

.keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}
.key {
  height: 56px;
  padding: 0;
  display: grid;
  place-items: center;
  font-size: 10px;
}
.key .pxnum { --px: 4px; }
.key.op { background: var(--c); color: var(--panel); }
.key.op:hover { filter: brightness(1.12); }
.key.fn { color: var(--muted); }
.key.go { background: var(--green); color: var(--panel); }
.key.go:hover { background: var(--lime); }
.key:disabled { background: var(--panel); color: var(--frame); filter: none; }
.key.op:disabled { background: var(--panel); color: var(--dim); }
.key.op.off { position: relative; }
.key.op.off::after {
  content: '';
  position: absolute;
  left: 22%;
  right: 22%;
  top: calc(50% - 2px);
  height: 4px;
  background: var(--red);
  transform: rotate(-35deg);
}

.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px; }

.help {
  margin: 0;
  text-align: center;
  font-size: 8px;
  color: var(--dim);
  line-height: 2;
}

.sum {
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}
.big { margin: 0; font-size: clamp(16px, 5vw, 22px); color: var(--yellow); text-shadow: 3px 3px 0 var(--orange); }
.sum-score { color: var(--ink); }
.sum-score .pxnum { --px: 7px; filter: drop-shadow(4px 4px 0 var(--frame)); }
.sum-line { margin: 0; font-size: 10px; color: var(--muted); }
.sum-line .pxnum { color: var(--ink); --px: 2px; }
.sum-line.good { color: var(--lime); }

.sum-list {
  list-style: none;
  margin: 4px 0;
  padding: 0;
  width: 100%;
  display: grid;
  gap: 6px;
}
.sum-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  background: var(--panel-2);
  text-align: left;
}
.sum-target { color: var(--yellow); min-width: 52px; }
.sum-target .pxnum { --px: 3px; }
.sum-expr { color: var(--ink); min-width: 0; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.sum-expr .pxnum { --px: 3px; }
.sum-expr small { font-size: 7px; color: var(--muted); }
.sum-item.skipped .sum-expr { color: var(--muted); }
.sum-pts { color: var(--lime); }
.sum-pts .pxnum { --px: 3px; }
.sum-item.skipped .sum-pts { color: var(--dim); }
.sum-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px; }

.noscript { text-align: center; padding: 40px 16px; }

@media (max-height: 860px) {
  body { padding: 8px 16px; }
  .app, .screen { gap: 8px; }
  .logo { font-size: 24px; margin: 0; }
  .target { min-height: 56px; }
  .target .pxnum { --px: 8px; }
  .lcd { padding: 10px 10px 8px; }
  .lcd-foot { margin-top: 8px; }
  .hint { margin-top: 6px; padding-top: 6px; }
  .stat { padding: 6px 4px; }
  .task { padding: 8px 14px 10px; }
  .key { height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; }
}