:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: #6b6b6b;
  --faint: #9a9a9a;
  --line: #e4e4e4;
  --line-strong: #cfcfcf;
  --panel: #fafafa;
  --accent: #0a0a0a;
  --ok: #1a7f37;
  --warn: #8a6d00;
  --err: #b3261e;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0b;
    --fg: #f3f3f3;
    --muted: #a0a0a0;
    --faint: #707070;
    --line: #232323;
    --line-strong: #353535;
    --panel: #121212;
    --accent: #f3f3f3;
    --ok: #4ac26b;
    --warn: #d9b400;
    --err: #ff6b61;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; cursor: pointer; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-mark { font-size: 18px; }
.brand-name { font-weight: 700; letter-spacing: -0.02em; font-size: 18px; }
.brand-tag { color: var(--muted); font-size: 12px; letter-spacing: 0.02em; }

.layout { max-width: 1180px; margin: 0 auto; padding: 32px 24px 64px; }

.composer { margin-bottom: 28px; }
.headline { font-size: 28px; font-weight: 700; letter-spacing: -0.03em; margin: 0 0 8px; }
.subhead { color: var(--muted); margin: 0 0 20px; max-width: 720px; }

textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--bg);
  color: var(--fg);
  padding: 14px 16px;
  font-size: 16px;
  font-family: inherit;
  resize: vertical;
}
textarea:focus { outline: none; border-color: var(--accent); }

.composer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.composer-options { display: flex; gap: 18px; flex-wrap: wrap; }
.composer-actions { display: flex; gap: 10px; }

label.inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}
label.inline select {
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: var(--bg);
  color: var(--fg);
  padding: 5px 8px;
  font-family: inherit;
}

.primary-btn {
  background: var(--accent);
  color: var(--bg);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 9px 18px;
  font-weight: 600;
  font-size: 14px;
}
.primary-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.ghost-btn {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 9px 14px;
  font-size: 14px;
}
.ghost-btn:hover { border-color: var(--accent); }
.ghost-btn.danger { color: var(--err); border-color: var(--line-strong); }

.linklike {
  background: none;
  border: none;
  color: var(--fg);
  text-decoration: underline;
  padding: 0;
  font-size: inherit;
}

.key-warning {
  margin-top: 14px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--panel);
  color: var(--muted);
  font-size: 13px;
}

.results-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 24px;
  align-items: start;
}
@media (max-width: 900px) {
  .results-grid { grid-template-columns: 1fr; }
}

.trace-panel, .report-panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  overflow: hidden;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.panel-head h2 { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.elapsed { font-family: var(--mono); font-size: 12px; color: var(--faint); }

.trace { list-style: none; margin: 0; padding: 10px; max-height: 70vh; overflow-y: auto; }
.trace-item {
  padding: 9px 10px;
  border-radius: 8px;
  margin-bottom: 4px;
  display: flex;
  gap: 9px;
  align-items: flex-start;
  font-size: 13.5px;
}
.trace-item .tdot {
  flex: 0 0 auto;
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 2px solid var(--line-strong);
  margin-top: 2px;
  position: relative;
}
.trace-item.running .tdot { border-color: var(--accent); animation: pulse 1s ease-in-out infinite; }
.trace-item.done .tdot { border-color: var(--ok); background: var(--ok); }
.trace-item.error .tdot { border-color: var(--err); background: var(--err); }
.trace-item.info .tdot { border-color: var(--faint); }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.trace-item .tbody { flex: 1; min-width: 0; }
.trace-item .ttitle { font-weight: 600; }
.trace-item .tagent {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.trace-item .tdetail { color: var(--muted); font-size: 12.5px; word-break: break-word; }
.trace-item .tdetail a { color: var(--muted); }

.report { padding: 22px 26px; min-height: 200px; max-height: 78vh; overflow-y: auto; }
.empty-state { color: var(--faint); font-size: 14px; padding: 40px 0; text-align: center; }

.report h1 { font-size: 24px; letter-spacing: -0.02em; margin: 0 0 14px; }
.report h2 { font-size: 19px; margin: 26px 0 10px; }
.report h3 { font-size: 16px; margin: 20px 0 8px; }
.report p { margin: 0 0 12px; }
.report ul, .report ol { margin: 0 0 12px; padding-left: 22px; }
.report li { margin-bottom: 5px; }
.report code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--line);
  padding: 1px 5px;
  border-radius: 4px;
}
.report pre {
  background: var(--line);
  padding: 12px 14px;
  border-radius: 8px;
  overflow-x: auto;
}
.report pre code { background: none; padding: 0; }
.report a { color: var(--fg); text-decoration: underline; text-underline-offset: 2px; }
.report blockquote {
  border-left: 3px solid var(--line-strong);
  margin: 0 0 12px;
  padding-left: 14px;
  color: var(--muted);
}
.cite {
  font-family: var(--mono);
  font-size: 0.78em;
  vertical-align: super;
  text-decoration: none;
  color: var(--fg);
  border-bottom: 1px dotted var(--line-strong);
}

.sources { border-top: 1px solid var(--line); padding: 18px 26px 24px; }
.sources h3 { margin: 0 0 10px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.sources ol { margin: 0; padding-left: 22px; }
.sources li { margin-bottom: 8px; font-size: 13.5px; }
.sources a { color: var(--fg); }
.sources .src-domain { color: var(--faint); font-family: var(--mono); font-size: 11px; }

/* modal */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.45);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
  padding: 20px;
}
.modal-card {
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  width: 100%; max-width: 520px;
  max-height: 90vh; overflow-y: auto;
  padding: 22px 24px;
}
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.modal-head h2 { margin: 0; font-size: 18px; }
.modal-note { color: var(--muted); font-size: 13px; margin: 0 0 18px; }

fieldset { border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin: 0 0 16px; }
legend { padding: 0 6px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.seg { display: flex; gap: 18px; margin-bottom: 12px; }
.seg label { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }

.field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 12px; }
.field:last-child { margin-bottom: 0; }
.field span { font-size: 13px; color: var(--muted); }
.field input {
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
  padding: 9px 11px;
  font-family: var(--mono);
  font-size: 13px;
}
.field input:focus { outline: none; border-color: var(--accent); }
.hint { color: var(--faint); font-size: 12px; }

.modal-actions { display: flex; justify-content: space-between; gap: 10px; margin-top: 6px; }

.footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px 36px;
  display: flex; justify-content: space-between; gap: 16px;
  color: var(--faint);
  font-size: 12px;
  flex-wrap: wrap;
}
.footer a { color: var(--faint); }