:root {
  --qt-bg: #0d1219;
  --qt-panel: #141c26;
  --qt-panel-soft: #1a2431;
  --qt-border: rgba(255, 255, 255, 0.14);
  --qt-text: #eff3f8;
  --qt-muted: #b9c5d6;
  --qt-accent: #5ad2ff;
  --qt-good: #8de3a1;
  --qt-bad: #ff8f8f;
}

[data-theme="light"] {
  --qt-bg: #f4f7fb;
  --qt-panel: #ffffff;
  --qt-panel-soft: #f0f4fa;
  --qt-border: rgba(12, 20, 34, 0.12);
  --qt-text: #121a26;
  --qt-muted: #4d5f78;
  --qt-accent: #0d72ff;
  --qt-good: #147a3f;
  --qt-bad: #a41f2d;
}

body.qt-shell {
  background: radial-gradient(1200px 700px at 8% -12%, rgba(90, 210, 255, 0.2), transparent 60%), var(--qt-bg);
  color: var(--qt-text);
}

#qt-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--qt-bg) 86%, transparent);
  border-bottom: 1px solid var(--qt-border);
}

.qt-topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
}

.qt-topbar-title {
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.qt-main {
  padding: 28px 0 46px;
}

.qt-intro {
  margin: 0;
  color: var(--qt-muted);
}

.qt-grid {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.qt-card {
  border: 1px solid var(--qt-border);
  border-radius: 14px;
  background: var(--qt-panel);
  padding: 18px;
}

.qt-card--soft {
  background: var(--qt-panel-soft);
}

.qt-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.qt-row-between {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.qt-field {
  display: grid;
  gap: 8px;
}

.qt-field label {
  font-size: 0.9rem;
  color: var(--qt-muted);
}

.qt-textarea,
.qt-input,
.qt-select {
  width: 100%;
  border: 1px solid var(--qt-border);
  border-radius: 10px;
  background: var(--qt-panel-soft);
  color: var(--qt-text);
  padding: 10px 12px;
  box-sizing: border-box;
}

.qt-textarea {
  min-height: 170px;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  line-height: 1.4;
}

.qt-output {
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
  border: 1px solid var(--qt-border);
  border-radius: 10px;
  padding: 12px;
  background: var(--qt-panel-soft);
  min-height: 48px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.qt-status {
  margin: 0;
  font-size: 0.92rem;
  color: var(--qt-muted);
}

.qt-status[data-state="good"] {
  color: var(--qt-good);
}

.qt-status[data-state="bad"] {
  color: var(--qt-bad);
}

.qt-sample {
  border: 1px solid var(--qt-border);
  border-radius: 10px;
  padding: 14px;
}

.qt-match-list {
  margin: 0;
  padding-left: 18px;
}

.qt-match-list li {
  margin-bottom: 6px;
}

.qt-meta {
  color: var(--qt-muted);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  .qt-topbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}