*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink);
  background: var(--paper);
  display: flex;
  flex-direction: column;
}

.top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  background: var(--paper-dark);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.top h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--rust);
}

.top .spacer {
  flex: 1;
}

.top a {
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 0.85rem;
}

.top a:hover {
  color: var(--rust);
}

.btn {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-bg);
  color: var(--ink);
  cursor: pointer;
}

.btn:hover {
  border-color: var(--rust);
  background: var(--rust-bg);
}

.btn.primary {
  background: var(--rust);
  border-color: var(--rust);
  color: #fff;
}

.btn.primary:hover {
  background: var(--rust-light);
  border-color: var(--rust-light);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: minmax(200px, 1.1fr) minmax(160px, 0.9fr);
  gap: 0.75rem;
  padding: 0.75rem;
  flex: 1;
  min-height: 0;
}

.panel {
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  min-height: 0;
  overflow: hidden;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  background: var(--paper-dark);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-body {
  flex: 1;
  min-height: 0;
  overflow: auto;
}

.editor-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.editor-toolbar {
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem 0.65rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.editor-area {
  position: relative;
  flex: 1;
  min-height: 0;
}

.editor-highlight,
#source {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0.75rem;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.5;
  border: none;
  white-space: pre;
  overflow: auto;
  tab-size: 2;
}

.editor-highlight {
  pointer-events: none;
  color: transparent;
  background: transparent;
  z-index: 1;
}

.editor-highlight .err-line {
  background: var(--error-bg);
  display: inline;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.editor-highlight .err-squiggle {
  border-bottom: 2px wavy var(--error);
}

#source {
  z-index: 2;
  resize: none;
  background: transparent;
  color: var(--ink);
  outline: none;
  caret-color: var(--rust);
}

#source.has-error {
  outline: 1px solid var(--error);
  outline-offset: -1px;
}

.error-bar {
  padding: 0.4rem 0.65rem;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--error);
  background: var(--error-bg);
  border-top: 1px solid rgba(185, 28, 28, 0.25);
  min-height: 1.6rem;
  flex-shrink: 0;
}

.error-bar:empty {
  display: none;
}

.json-out,
#output {
  margin: 0;
  padding: 0.65rem 0.75rem;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}

#output {
  color: var(--ink);
}

.bytecode-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 12px;
}

.bytecode-table th,
.bytecode-table td {
  padding: 0.25rem 0.5rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.bytecode-table th {
  position: sticky;
  top: 0;
  background: var(--paper-dark);
  font-weight: 600;
  color: var(--ink-muted);
  font-size: 11px;
}

.bytecode-table tr.current {
  background: var(--rust-bg);
  outline: 1px solid var(--rust);
}

.bytecode-table tr.current td:first-child {
  color: var(--rust);
  font-weight: 600;
}

.token-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.token-list li {
  font-family: var(--mono);
  font-size: 11px;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  background: var(--paper);
  border: 1px solid var(--border);
}

.token-list .kw {
  color: var(--rust);
  border-color: var(--rust);
  background: var(--rust-bg);
}

.token-list .num {
  color: #1d4ed8;
}

.token-list .op {
  color: var(--ink-muted);
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }
}