:root {
  color-scheme: light dark;
  --page-bg: var(--uc-page-bg, #10131a);
  --page-bg-accent: var(--uc-page-bg-accent, #131927);
  --panel: var(--uc-panel, #181d27);
  --panel-2: var(--uc-panel-2, #1e2531);
  --text: var(--uc-text, #eef2ff);
  --muted: var(--uc-muted, #aeb8cd);
  --border: var(--uc-border, #2d3748);
  --primary: var(--uc-primary, #7aa2ff);
  --insert: var(--uc-insert, #f59e0b);
  --danger: var(--uc-danger, #ff8a8a);
  --shadow: var(--uc-shadow, 0 16px 40px rgba(0, 0, 0, 0.28));
  --control-bg: var(--uc-control-bg, rgba(255, 255, 255, 0.03));
  --control-bg-strong: var(--uc-control-bg-strong, #202735);
  --control-bg-weak: var(--uc-control-bg-weak, #1b2230);
  --control-bg-elevated: var(--uc-control-bg-elevated, rgba(24, 29, 39, 0.98));
  --control-bg-soft: var(--uc-control-bg-soft, rgba(255, 255, 255, 0.02));
  --history-bg: var(--uc-history-bg, #181d27);
  --history-bg-2: var(--uc-history-bg-2, #1b2130);
  --chip-none-bg: var(--uc-chip-none-bg, rgba(174, 184, 205, 0.12));
  --chip-none-text: var(--uc-chip-none-text, #dbe4f3);
  --chip-none-border: var(--uc-chip-none-border, rgba(174, 184, 205, 0.55));
  --primary-ring: color-mix(in srgb, var(--primary) 14%, transparent);
  --primary-ring-strong: color-mix(in srgb, var(--primary) 18%, transparent);
  --primary-fill: color-mix(in srgb, var(--primary) 14%, transparent);
  --primary-fill-soft: color-mix(in srgb, var(--primary) 8%, transparent);
  --primary-border: color-mix(in srgb, var(--primary) 55%, transparent);
  --primary-chip: color-mix(in srgb, var(--primary) 80%, white 20%);
  --insert-ring: color-mix(in srgb, var(--insert) 18%, transparent);
  --danger-soft: color-mix(in srgb, var(--danger) 12%, transparent);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, var(--page-bg) 0%, var(--page-bg-accent) 100%);
  color: var(--text);
}

button {
  font: inherit;
}

[hidden] {
  display: none !important;
}

.app-shell {
  width: min(920px, 100%);
  margin: 0 auto;
  padding: 16px 16px 40px;
}

.app-header h1 {
  margin: 0 0 6px;
  font-size: clamp(2rem, 5vw, 2.6rem);
}

.app-header p {
  margin: 0 0 18px;
  color: var(--muted);
}

.compact-panel {
  padding: 14px;
  border-radius: 20px;
}

.panel {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.expression-panel {
  position: relative;
  min-height: 116px;
}

.panel + .panel,
.panel + .controls-grid,
.controls-grid + .panel,
.panel + .history-block {
  margin-top: 16px;
}

.panel-label, .history-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 10px;
  user-select: none;
  -webkit-user-select: none;
}

.keypad-subtitle {
  margin-top: 14px;
}

.result-text {
  font-size: clamp(1.7rem, 6vw, 2.6rem);
  font-weight: 800;
  line-height: 1.1;
  min-height: 2.75em;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding-inline: 8px;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.result-text .unit-tag {
  display: inline-block;
  margin-inline: 0.12em;
  padding: 0.08em 0.42em;
  border-radius: 999px;
  background: var(--unit-color, var(--primary));
  color: white;
  vertical-align: baseline;
}

.result-panel {
  overflow: hidden;
}

.assign-help {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  user-select: none;
  -webkit-user-select: none;
}

.result-controls {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 14px;
}

.result-action-button {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  min-height: 28px;
  padding: 0 8px;
  border: 1px solid var(--uc-field-border, var(--border));
  border-radius: 999px;
  background: color-mix(in srgb, var(--control-bg-elevated) 88%, var(--primary) 12%);
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 800;
  line-height: 1;
  box-shadow: 0 6px 14px rgba(31, 50, 92, 0.12);
}

.result-action-button:disabled {
  opacity: 0.5;
  cursor: default;
}

.output-button {
  position: relative;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--control-bg-strong);
  color: var(--text);
  min-height: 40px;
  padding: 0 2rem 0 12px;
  font-weight: 700;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.output-button::after {
  content: "▾";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-52%);
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1;
  pointer-events: none;
}

.output-menu {
  display: grid;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--control-bg);
}

.output-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.output-column {
  display: grid;
  gap: 8px;
}

.output-label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.token-wrap,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.clipboard-proxy {
  position: fixed;
  left: -10000px;
  top: -10000px;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: 0;
  opacity: 0.01;
  font-size: 1px;
  line-height: 1px;
  letter-spacing: 0;
  text-shadow: none;
  color: transparent;
  background: transparent;
  caret-color: transparent;
  border: 0;
  outline: none;
  resize: none;
  z-index: 2;
  pointer-events: none;
  overflow: hidden;
}

.clipboard-touch-menu {
  position: fixed;
  z-index: 50;
  display: grid;
  gap: 8px;
  padding: 10px;
  min-width: 140px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--control-bg-elevated);
  box-shadow: var(--shadow);
}

.clipboard-touch-menu[hidden] {
  display: none !important;
}

.clipboard-touch-menu .chip {
  width: 100%;
  justify-content: flex-start;
}

.clipboard-paste-prompt {
  display: grid;
  gap: 10px;
}

.clipboard-paste-input {
  width: 100%;
  min-height: 92px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--control-bg);
  color: var(--text);
  padding: 10px 12px;
  resize: vertical;
}

.clipboard-paste-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.clipboard-copy-prompt {
  display: grid;
  gap: 10px;
}

.clipboard-copy-preview {
  width: 100%;
  min-height: 92px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--control-bg);
  color: var(--text);
  padding: 10px 12px;
  resize: vertical;
}

.clipboard-copy-options {
  display: grid;
  gap: 8px;
}

.clipboard-option {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 0.95rem;
}

.clipboard-option input {
  width: 18px;
  height: 18px;
}

.clipboard-copy-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.clipboard-proxy::selection {
  background: transparent;
  color: transparent;
}

.clipboard-proxy::-moz-selection {
  background: transparent;
  color: transparent;
}

.token,
.chip,
.key,
.action-key,
.history-card,
.history-delete,
.output-button {
  user-select: none;
  -webkit-user-select: none;
}

.token-wrap {
  flex-wrap: nowrap;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 2px;
  min-height: 56px;
  align-items: center;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  position: relative;
  z-index: 1;
}

.token-wrap > * {
  flex: 0 0 auto;
}

.operator-chip-row {
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 2px;
}

.operator-chip-row .chip {
  min-width: 52px;
  padding: 8px 10px;
  white-space: nowrap;
}

.token {
  border: 2px solid var(--border);
  border-radius: 18px;
  padding: 8px 10px;
  cursor: pointer;
  background: var(--control-bg-soft);
  min-width: 72px;
  flex: 0 0 auto;
}

.token.selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-ring);
}

.token.selected--mid {
  border-color: var(--insert);
  background: color-mix(in srgb, var(--insert) 14%, var(--control-bg-soft));
  box-shadow: 0 0 0 3px var(--insert-ring), inset 0 0 0 1px color-mix(in srgb, var(--insert) 22%, transparent);
}

.token.ft-in-composite {
  border-color: var(--primary-border);
  background: var(--primary-fill-soft);
  min-width: 0;
  width: fit-content;
  padding: 6px 8px;
  display: inline-grid;
  gap: 4px;
}

.ft-in-composite__value {
  font-size: 0.86rem;
  line-height: 1.1;
  white-space: nowrap;
}

.ft-in-composite__badge {
  background: var(--primary-chip) !important;
  margin-top: 0;
  padding: 3px 7px;
}

.token.operator,
.token.paren {
  min-width: 34px;
  min-height: 34px;
  text-align: center;
  display: grid;
  place-items: center;
  font-weight: 800;
}

.token.operator {
  padding: 4px 8px;
  border-radius: 12px;
}

.token.paren {
  padding: 4px 8px;
  border-radius: 12px;
}

.token.operator.selected,
.token.paren.selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-ring);
}

.token.operator.selected--mid,
.token.paren.selected--mid {
  border-color: var(--insert);
  background: color-mix(in srgb, var(--insert) 16%, var(--control-bg-soft));
  box-shadow: 0 0 0 3px var(--insert-ring), inset 0 0 0 1px color-mix(in srgb, var(--insert) 24%, transparent);
}

.action-key.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-ring);
}

.token-value {
  font-size: 0.98rem;
  font-weight: 700;
}

.unit-badge {
  display: inline-block;
  margin-top: 7px;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 0.78rem;
  color: white;
}

.controls-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr 1fr;
}

.chip {
  border: 1px solid var(--border);
  background: var(--control-bg);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 12px;
  min-width: 58px;
  cursor: pointer;
}

.chip.active {
  border-color: var(--primary);
  background: var(--primary-fill);
}

.chip--unit {
  border-color: color-mix(in srgb, var(--unit-color, var(--primary)) 70%, transparent);
  background: var(--unit-color, var(--primary));
  color: white;
}

.chip--unit.active {
  border-color: color-mix(in srgb, var(--unit-color, var(--primary)) 82%, black 18%);
  background: color-mix(in srgb, var(--unit-color, var(--primary)) 90%, black 10%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--unit-color, var(--primary)) 22%, transparent);
}

.keypad-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.key,
.action-key {
  border: 1px solid var(--border);
  background: var(--control-bg-strong);
  color: var(--text);
  border-radius: 18px;
  min-height: 50px;
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: 700;
}

.key--operator {
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 25%, transparent) 0%, var(--primary-fill) 100%);
  border-color: color-mix(in srgb, var(--primary) 55%, transparent);
}

.key--utility {
  background: var(--control-bg-weak);
}

.key--digit {
  background: var(--control-bg-strong);
}

.key--span-2 {
  grid-column: span 2;
}

.key:hover,
.chip:hover,
.token:hover,
.action-key:hover {
  filter: brightness(1.08);
}

.action-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 8px;
}

.quick-unit-row {
  margin-top: 8px;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 2px;
}

.quick-unit-row .chip {
  min-width: 52px;
  padding: 8px 10px;
}

.quick-unit-row .chip.active {
  box-shadow: 0 0 0 3px var(--primary-ring);
}

.quick-unit-row .chip--none {
  border-color: var(--chip-none-border);
  background: var(--chip-none-bg);
  color: var(--chip-none-text);
}

.quick-unit-row .chip--none.active {
  border-color: var(--primary);
  background: var(--primary-fill);
}

.assign-panel .chip-row {
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 2px;
}

.assign-panel .chip-row .chip {
  min-width: 52px;
  padding: 8px 10px;
  white-space: nowrap;
}

.assign-helper-row {
  margin-top: 10px;
}

.assign-helper-row .chip {
  min-width: 92px;
}

.assign-panel .chip-row .chip--none {
  border-color: var(--chip-none-border);
  background: var(--chip-none-bg);
  color: var(--chip-none-text);
}

.assign-panel .chip-row .chip--none.active {
  border-color: var(--primary);
  background: var(--primary-fill);
}

.action-key:nth-child(1),
.action-key:nth-child(2) {
  grid-column: span 1;
}

.history-list {
  display: grid;
  gap: 12px;
}

.app-footer {
  display: grid;
  gap: 12px;
  margin-top: 20px;
  border-top: 1px solid color-mix(in srgb, var(--border) 42%, transparent);
}

.app-footer-copy {
  color: var(--muted);
  line-height: 1.6;
  max-width: 70ch;
}

.app-footer-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  line-height: 1.6;
  display: grid;
  gap: 0.45rem;
  max-width: 72ch;
}

.app-footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.app-footer-note {
  color: var(--muted);
  font-size: 0.92rem;
}

.app-footer-note:hover,
.app-footer-note:focus-visible {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

.app-footer-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.history-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: stretch;
}

.history-controls {
  display: grid;
  grid-template-rows: repeat(3, auto);
  gap: 0;
}

.history-handle {
  align-self: stretch;
  min-width: 40px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--control-bg);
  color: var(--muted);
  cursor: grab;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.history-move {
  display: none;
  box-sizing: border-box;
  width: 100%;
  border: 1px solid var(--border);
  background: var(--control-bg);
  color: var(--muted);
  font-weight: 700;
}

.history-move-icon {
  display: inline-block;
  font-size: 0.92em;
  line-height: 1;
}

.history-move-icon--down {
  transform: rotate(180deg);
}

.history-move:disabled {
  opacity: 0.35;
  cursor: default;
}

.history-row--drop-target .history-card {
  border-color: var(--primary-chip);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--primary) 16%, transparent);
}

.history-row--drag-source {
  opacity: 0.72;
}

.history-card {
  display: grid;
  gap: 6px;
  text-align: left;
  background: linear-gradient(180deg, var(--history-bg) 0%, var(--history-bg-2) 100%);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 14px 16px;
  cursor: pointer;
}

.history-expression {
  font-weight: 700;
  color: var(--text);
}

.history-result {
  color: var(--muted);
  font-size: 0.92rem;
}

.history-delete {
  align-self: stretch;
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
  border-radius: 14px;
  background: var(--danger-soft);
  color: #fecaca;
  min-width: 74px;
  padding: 0 12px;
  font-weight: 700;
}

@media (max-width: 700px) {
  .compact-panel {
    padding: 10px;
    border-radius: 16px;
  }

  .panel {
    padding: 12px;
    border-radius: 16px;
  }

  .panel-label,
  .history-title {
    font-size: 0.8rem;
    margin-bottom: 6px;
  }

  .assign-help {
    font-size: 0.78rem;
    margin-top: 4px;
  }

  .assign-helper-row {
    margin-top: 8px;
  }

  .result-controls {
    gap: 4px;
    margin-top: 6px;
  }

  .result-action-button {
    top: 10px;
    right: 10px;
    min-width: 24px;
    min-height: 24px;
    padding: 0 6px;
    font-size: 0.75rem;
  }

  .output-button {
    min-height: 32px;
    border-radius: 10px;
    padding: 0 10px;
    font-size: 0.8rem;
  }

  .output-menu {
    gap: 8px;
    padding: 8px;
    border-radius: 12px;
  }

  .output-grid {
    gap: 8px;
  }

  .output-column {
    gap: 5px;
  }

  .token-wrap,
  .chip-row {
    gap: 6px;
  }

  .result-text {
    min-height: 2.1em;
    font-size: clamp(1.1rem, 4.8vw, 1.55rem);
  }

  .key,
  .action-key {
    min-height: 42px;
    border-radius: 14px;
  }

  .token {
    min-width: 60px;
    padding: 6px 8px;
  }

  .token-value {
    font-size: 0.86rem;
  }

  .history-card {
    padding: 10px 12px;
    border-radius: 14px;
  }

  .history-controls {
    gap: 4px;
    min-width: 58px;
  }

  .history-handle {
    display: none;
  }

  .history-move {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 58px;
    min-width: 58px;
    height: 28px;
    min-height: 28px;
    padding: 0;
    border-radius: 12px;
    font-size: 0.82rem;
    line-height: 1;
  }

  .history-move--up {
    border-radius: 12px 12px 6px 6px;
  }

  .history-move--down {
    border-radius: 6px 6px 12px 12px;
  }

  .history-delete {
    min-width: 64px;
    padding: 0 10px;
  }
}

.history-expression {
  font-weight: 600;
}

.history-result {
  color: var(--primary);
  margin-top: 4px;
}

.error {
  color: var(--danger);
}

.empty {
  color: var(--muted);
  min-height: 56px;
  display: flex;
  align-items: center;
}

@media (max-width: 700px) {
  .controls-grid {
    grid-template-columns: 1fr;
  }

  .app-shell {
    padding-left: 12px;
    padding-right: 12px;
  }
}

@media (max-width: 480px) {
  .app-shell {
    padding-left: 10px;
    padding-right: 10px;
    padding-top: 10px;
    padding-bottom: 28px;
  }

  .panel {
    padding: 10px;
    border-radius: 14px;
  }

  .compact-panel {
    padding: 6px;
  }

  .panel + .panel,
  .panel + .controls-grid,
  .controls-grid + .panel,
  .panel + .history-block {
    margin-top: 12px;
  }

  .expression-panel {
    min-height: 96px;
  }

  .token-wrap,
  .empty {
    min-height: 44px;
  }

  .key,
  .action-key {
    min-height: 38px;
    border-radius: 12px;
  }

  .token {
    min-width: 52px;
    padding: 5px 6px;
  }

  .token-value {
    font-size: 0.8rem;
  }

  .result-text {
    min-height: 1.9em;
    font-size: clamp(1rem, 4.4vw, 1.35rem);
  }

  .history-card {
    padding: 9px 10px;
    border-radius: 12px;
  }

  .history-result {
    font-size: 0.8rem;
  }

  .history-delete {
    min-width: 58px;
    padding: 0 8px;
    border-radius: 12px;
  }

  .history-controls {
    min-width: 54px;
  }

  .history-move {
    width: 54px;
    min-width: 54px;
    height: 28px;
    min-height: 28px;
    padding: 0;
  }
}