:root {
  --bg: #0b0f19; --card: #161b28; --border: #2a3142;
  --txt: #e2e8f0; --muted: #8494b0; --accent: #6366f1;
  --accent-glow: rgba(99,102,241,0.35); --success: #10b981;
  --r: 16px; --r-sm: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
body {
  background: var(--bg); color: var(--txt); display: flex; justify-content: center;
  min-height: 100vh; padding: 1.5rem; opacity: 0; transition: opacity 0.4s ease;
}
.app { width: 100%; max-width: 400px; display: flex; flex-direction: column; gap: 1.25rem; }
.header { text-align: center; margin-bottom: 0.25rem; }
.header h1 { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; }
.header p { color: var(--muted); font-size: 0.85rem; margin-top: 0.2rem; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r);
  padding: 1.25rem; display: flex; flex-direction: column; gap: 1.1rem;
  box-shadow: 0 12px 32px rgba(0,0,0,0.4);
}
.input-row label { display: block; font-size: 0.75rem; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.4rem; }
.currency-wrap { position: relative; }
.currency-wrap .sym { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 1.1rem; pointer-events: none; }
input[type="number"] {
  width: 100%; padding: 13px 14px 13px 32px; background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--r-sm); color: var(--txt); font-size: 1.15rem; font-weight: 500;
  transition: border-color 0.2s, box-shadow 0.2s; appearance: textfield;
}
input[type="number"]::-webkit-inner-spin-button, input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"]:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.pill-row { display: flex; gap: 8px; margin-bottom: 6px; flex-wrap: wrap; }
.pill-row button {
  flex: 1; min-width: 48px; padding: 10px 4px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; color: var(--muted); font-size: 0.85rem; font-weight: 600; cursor: pointer;
  transition: all 0.2s; touch-action: manipulation;
}
.pill-row button:hover { border-color: var(--muted); color: var(--txt); }
.pill-row button.active { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 4px 12px var(--accent-glow); }
input[type="range"] { width: 100%; height: 6px; -webkit-appearance: none; background: var(--border); border-radius: 4px; outline: none; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; background: var(--accent); border-radius: 50%; cursor: pointer; box-shadow: 0 2px 8px var(--accent-glow); }
.results-panel {
  background: linear-gradient(135deg, #1e2638, #161b28); border: 1px solid var(--border);
  border-radius: var(--r-sm); padding: 1rem 1.25rem; display: flex; flex-direction: column; gap: 10px; margin-top: 0.5rem;
}
.res-row { display: flex; justify-content: space-between; align-items: baseline; }
.res-row span:first-child { font-size: 0.9rem; color: var(--muted); }
.res-row span:last-child { font-size: 1.25rem; font-weight: 700; color: var(--txt); transition: transform 0.15s; }
.res-row.highlight span:last-child { font-size: 1.75rem; color: var(--success); }
.pop { animation: pop 0.2s ease; }
@keyframes pop { 0% { transform: scale(1); } 50% { transform: scale(1.06); } 100% { transform: scale(1); } }
.overlay {
  position: fixed; inset: 0; background: rgba(10,12,20,0.92); display: flex; align-items: center;
  justify-content: center; z-index: 1000; opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.overlay.visible { opacity: 1; pointer-events: auto; }
.overlay-content {
  background: var(--card); padding: 1rem 2rem; border-radius: var(--r-sm); border: 1px solid var(--border);
  box-shadow: 0 12px 40px rgba(0,0,0,0.5); animation: pulse 2.5s infinite;
}
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.03); } }
.paused * { animation-play-state: paused !important; }
@media (max-width: 380px) {
  .pill-row { gap: 6px; }
  .pill-row button { font-size: 0.8rem; padding: 8px 2px; }
  .app { padding-bottom: 2rem; }
}