/* ============================================================
   TIP CALCULATOR — Meta Display HUD
   600 × 600, D-pad driven. Pure-black bg = transparent on lens.
   ▲▼ bill · ◀▶ tip % · Enter cycles party size.
   ============================================================ */

:root {
  --bg:        #000000;
  --text:      #f4f7ff;
  --text-2:    #aeb7d6;
  --text-3:    #5e688c;

  --green:     #5cf28a;
  --green-glow:rgba(92, 242, 138, 0.45);
  --amber:     #ffb84d;
  --amber-glow:rgba(255, 184, 77, 0.5);

  --line:      #232a44;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 600px;
  height: 600px;
  background: var(--bg);
  color: var(--text);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  overflow: hidden;
}

.mono { font-family: 'JetBrains Mono', monospace; }

#app {
  width: 600px;
  height: 600px;
  display: flex;
  flex-direction: column;
  padding: 24px 36px 20px;
}

/* ---- top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 2px;
}
.brand-mark {
  font-size: 26px;
  color: var(--green);
  text-shadow: 0 0 12px var(--green-glow);
}
.brand-text { font-size: 22px; color: var(--text-2); }
.people {
  margin-left: auto;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-3);
  letter-spacing: 1px;
}
.people.active { color: var(--amber); text-shadow: 0 0 12px var(--amber-glow); }

/* ---- bill / tip rows ---- */
.row {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 20px;
  border-bottom: 2px solid var(--line);
}
.row-label {
  width: 86px;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--text-3);
}
.row-value {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.cur { font-size: 40px; font-weight: 700; color: var(--text-2); }
.big {
  font-size: 96px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -2px;
}
.tip-amt {
  margin-left: 16px;
  align-self: center;
  font-size: 30px;
  font-weight: 600;
  color: var(--green);
  text-shadow: 0 0 10px var(--green-glow);
}
.row-hint {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.key {
  display: inline-block;
  min-width: 30px;
  padding: 4px 8px;
  text-align: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-2);
  border: 2px solid var(--line);
  border-radius: 8px;
}

/* ---- total ---- */
#total {
  display: flex;
  align-items: baseline;
  justify-content: flex-end;
  gap: 14px;
  padding: 18px 0 10px;
}
.total-label {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--text-3);
  margin-right: auto;
}
.total-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--green);
  text-shadow: 0 0 18px var(--green-glow);
}
.total-value .cur { font-size: 44px; color: var(--green); }
.total-value .mono {
  font-size: 104px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -2px;
}

/* ---- foot bar ---- */
.footbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-3);
  letter-spacing: 0.5px;
}
.footbar .key { padding: 2px 8px; margin-right: 6px; }
#per-person { color: var(--amber); text-shadow: 0 0 10px var(--amber-glow); }
.hidden { visibility: hidden; }

/* brief flash when a value changes via D-pad */
@keyframes bump { 0% { transform: scale(1.08); } 100% { transform: scale(1); } }
.bump { animation: bump 0.12s ease-out; }