:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --bg-elevated: #252535;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --warn: #ffaa00;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.45);
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
}

* { 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;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

button {
  background: transparent;
  border: 2px solid transparent;
  color: inherit;
  font-family: inherit;
  cursor: pointer;
  outline: none;
}

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

.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, transform 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);
  transform: scale(1.01);
}

.hidden { display: none !important; }

/* Topbar */
.topbar {
  padding: 14px 24px 12px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--bg-tertiary);
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.2px;
}

.subtitle {
  font-size: 11px;
  color: var(--text-secondary);
  letter-spacing: 0.6px;
  text-transform: uppercase;
}

/* Content */
.content {
  flex: 1;
  padding: 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

.label {
  font-size: 10px;
  color: var(--text-secondary);
  letter-spacing: 1.6px;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* Home — amount card */
.amount-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.amount-value {
  font-size: 38px;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

/* Home — currency row */
.currency-row {
  display: flex;
  gap: 12px;
}

.currency-card {
  flex: 1;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-height: 92px;
  justify-content: center;
}

.currency-code {
  font-size: 30px;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 1.5px;
  line-height: 1.05;
}

.currency-name {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Home — result */
.result-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  border: 2px solid var(--accent);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.result-value {
  font-size: 42px;
  font-weight: 800;
  color: var(--accent-secondary);
  font-variant-numeric: tabular-nums;
  line-height: 1.05;
}

.result-rate {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
  font-variant-numeric: tabular-nums;
}

/* Home — action row */
.action-row {
  display: flex;
  gap: 12px;
  margin-top: 4px;
}

.action-btn {
  flex: 1;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  min-height: 56px;
}

/* Amount editor */
.editor-content {
  gap: 14px;
  padding: 20px 24px;
}

.amount-display-big {
  font-size: 58px;
  font-weight: 800;
  text-align: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 18px;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  letter-spacing: 1px;
}

.amount-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.amt-btn {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 12px;
  font-size: 18px;
  font-weight: 700;
  min-height: 56px;
  font-variant-numeric: tabular-nums;
}

.amt-btn.amt-down { color: var(--danger); }
.amt-btn.amt-up { color: var(--accent-secondary); }

.preset-row {
  display: flex;
  gap: 8px;
}

.preset-btn {
  flex: 1;
  background: var(--bg-secondary);
  color: var(--accent);
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 15px;
  font-weight: 700;
  min-height: 44px;
  font-variant-numeric: tabular-nums;
}

.done-btn {
  background: var(--accent);
  color: #000;
  border-radius: var(--radius-md);
  padding: 14px;
  font-size: 18px;
  font-weight: 800;
  min-height: 56px;
  letter-spacing: 0.5px;
}

.done-btn:focus {
  background: var(--accent-secondary);
}

/* Picker list */
.picker-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scroll-behavior: smooth;
}

.picker-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  text-align: left;
  width: 100%;
  flex-shrink: 0;
}

.picker-item[data-selected="true"] {
  background: var(--bg-tertiary);
}

.picker-item[data-selected="true"] .picker-code {
  color: var(--accent-secondary);
}

.picker-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.picker-symbol {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  min-width: 44px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.picker-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
}

.picker-code {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.8px;
}

.picker-name {
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 280px;
}

.picker-rate {
  font-size: 13px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.picker-item[data-selected="true"] .picker-rate {
  color: var(--text-primary);
}

/* Rates list */
.rates-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  scroll-behavior: smooth;
}

.rate-row {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  flex-shrink: 0;
  width: 100%;
  text-align: left;
}

.rate-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.rate-symbol {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  min-width: 44px;
  text-align: center;
}

.rate-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
}

.rate-code {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.rate-name {
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 260px;
}

.rate-value {
  font-size: 17px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent-secondary);
  flex-shrink: 0;
}

/* Scrollbar */
.picker-list::-webkit-scrollbar,
.rates-list::-webkit-scrollbar {
  width: 4px;
}

.picker-list::-webkit-scrollbar-track,
.rates-list::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

.picker-list::-webkit-scrollbar-thumb,
.rates-list::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 2px;
}