:root {
  --bg: #f5f7fb;
  --ink: #172033;
  --muted: #667085;
  --line: #d8deea;
  --panel: #ffffff;
  --accent: #0f766e;
  --accent-2: #2563eb;
  --warn: #b45309;
  --fail: #b91c1c;
  --ok: #15803d;
  --code: #101827;
  --code-ink: #d7e2f3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}

button,
textarea,
input {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 310px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 24px 20px;
  background: #101827;
  color: #edf3ff;
  border-right: 1px solid #0b1220;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid #2e3b56;
  background: #162238;
  color: #8be4d3;
  font-weight: 800;
  border-radius: 8px;
}

.brand h1 {
  margin: 0;
  font-size: 18px;
  line-height: 1.2;
}

.brand p {
  margin: 4px 0 0;
  color: #9aa8c2;
  font-size: 12px;
}

.steps {
  display: grid;
  gap: 10px;
}

.step {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  min-height: 54px;
  padding: 10px;
  border: 1px solid #24314a;
  background: #121e33;
  border-radius: 8px;
}

.step-dot {
  width: 12px;
  height: 12px;
  margin-top: 4px;
  border-radius: 50%;
  border: 2px solid #64748b;
  background: transparent;
}

.step-copy {
  min-width: 0;
}

.step strong {
  display: block;
  font-size: 13px;
  line-height: 1.25;
}

.step span {
  display: block;
  margin-top: 4px;
  color: #9aa8c2;
  font-size: 12px;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.step.running {
  border-color: #48c6b5;
  background: #122d3a;
}

.step.running .step-dot {
  border-color: #5eead4;
  box-shadow: 0 0 0 5px rgba(94, 234, 212, 0.12);
}

.step.done .step-dot {
  background: var(--ok);
  border-color: var(--ok);
}

.step.failed {
  border-color: #e16a6a;
}

.step.failed .step-dot {
  background: var(--fail);
  border-color: var(--fail);
}

.toolbox {
  display: grid;
  gap: 10px;
  margin-top: auto;
}

button {
  min-height: 40px;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
}

button:disabled {
  opacity: 0.55;
  cursor: wait;
}

.primary {
  background: var(--accent);
  color: white;
}

.secondary {
  background: #1c2940;
  color: #edf3ff;
  border-color: #34425e;
}

.status-line {
  min-height: 36px;
  padding: 9px 10px;
  border: 1px solid #263752;
  background: #0d1525;
  color: #c8d5eb;
  border-radius: 8px;
  font-size: 12px;
}

.workspace {
  display: grid;
  grid-template-rows: minmax(260px, 36vh) minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  min-width: 0;
}

.input-band,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.input-band {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
}

.section-head,
.panel header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.section-head h2,
.panel h3 {
  margin: 0;
  font-size: 15px;
}

.section-head p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.file-control {
  position: relative;
  flex: 0 0 auto;
  min-width: 140px;
}

.file-control input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.file-control span {
  display: block;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #f8fafc;
  font-weight: 700;
  text-align: center;
  font-size: 13px;
}

textarea {
  width: 100%;
  height: 100%;
  min-height: 160px;
  resize: none;
  border: 0;
  outline: 0;
  padding: 14px;
  color: var(--ink);
  background: #ffffff;
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-rows: minmax(280px, 1fr);
  gap: 14px;
  min-height: 0;
}

.panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
  overflow: hidden;
}

.panel header span,
.tabs .tab {
  border: 1px solid var(--line);
  background: #f8fafc;
  color: var(--muted);
  padding: 5px 8px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
}

.tabs {
  display: flex;
  gap: 6px;
}

.tabs .tab {
  min-height: 28px;
}

.tabs .tab.active {
  background: #e7f7f3;
  color: var(--accent);
  border-color: #a7ded3;
}

pre {
  margin: 0;
  padding: 12px 14px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 12px;
  line-height: 1.45;
}

.code-view,
#checkerLog,
#simulationLog,
#intentView {
  background: var(--code);
  color: var(--code-ink);
}

.hidden {
  display: none;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-bottom: 1px solid var(--line);
}

.metric-row div {
  padding: 10px 14px;
  border-right: 1px solid var(--line);
}

.metric-row div:last-child {
  border-right: 0;
}

.metric-row span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.metric-row strong {
  display: block;
  margin-top: 2px;
  font-size: 16px;
}

.pass {
  color: var(--ok);
}

.fail {
  color: var(--fail);
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    min-height: auto;
  }

  .workspace {
    grid-template-rows: minmax(300px, 44vh) auto;
  }

  .result-grid {
    grid-template-columns: 1fr;
  }
}