:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #707088;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --warning: #ffaa00;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --edit-ring: #ffaa00;
  --edit-glow: rgba(255, 170, 0, 0.45);
  --radius-md: 12px;
  --radius-sm: 8px;
}

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

html, body {
  width: 600px;
  height: 600px;
  overflow: hidden;
  background: #000;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
}

#app { width: 100%; height: 100%; position: relative; }

.screen {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  flex-direction: column;
}
.screen.hidden { display: none; }

.focusable {
  transition: border-color 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
  border: 2px solid transparent;
  cursor: pointer;
  outline: none;
}
.focusable:focus {
  border-color: var(--focus-ring);
  box-shadow: 0 0 20px var(--focus-glow);
}
.hidden { display: none !important; }

.header {
  background: var(--bg-primary);
  padding: 12px 20px 10px;
  border-bottom: 1px solid var(--bg-tertiary);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.header h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.4px;
}
.header-mode {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 600;
}
.header-mode.editing {
  color: var(--warning);
}

.content {
  flex: 1;
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow: hidden;
}

.input-row {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 10px 18px;
  min-height: 76px;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto 1fr;
  column-gap: 16px;
  row-gap: 2px;
  align-items: center;
}
.input-row.editing {
  border-color: var(--edit-ring);
  box-shadow: 0 0 24px var(--edit-glow);
  background: var(--bg-tertiary);
}
.row-label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
  grid-column: 1;
  grid-row: 1;
}
.row-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  grid-column: 2;
  grid-row: 1 / span 2;
  text-align: right;
  line-height: 1.05;
}
.input-row.editing .row-value {
  color: var(--warning);
  text-shadow: 0 0 14px rgba(255, 170, 0, 0.5);
}
.row-hint {
  font-size: 11px;
  color: var(--text-muted);
  grid-column: 1;
  grid-row: 2;
  letter-spacing: 0.2px;
}
.input-row.editing .row-hint {
  color: var(--warning);
  font-weight: 600;
}

.result-panel {
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  border-radius: var(--radius-md);
  padding: 14px 18px;
  border: 1px solid rgba(0, 212, 255, 0.22);
  text-align: center;
}
.result-label {
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 700;
  margin-bottom: 4px;
}
.result-main {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 22px rgba(0, 212, 255, 0.45);
  letter-spacing: -0.5px;
  margin-bottom: 8px;
  line-height: 1;
}
.result-secondary {
  display: flex;
  justify-content: space-around;
  gap: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 8px;
}
.result-cell {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.result-cell-label {
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 600;
}
.result-cell-value {
  font-size: 15px;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.btn {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 14px;
  min-height: 50px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  font-family: inherit;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.btn:focus {
  background: var(--bg-tertiary);
}