:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
  --blue: #58a6ff;
  --mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

header {
  padding: 1.5rem 1rem 0.5rem;
  text-align: center;
}
header h1 {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}
header h1::before { content: '⌨️ '; }
header p {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem;
}

/* Input bar */
.input-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.input-bar.hidden { display: none; }
.input-bar input {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.95rem;
  padding: 0.6rem 0.75rem;
  outline: none;
}
.input-bar input:focus {
  border-color: var(--blue);
  animation: cursor-blink 1.1s step-end infinite;
}
@keyframes cursor-blink {
  0%, 100% { box-shadow: 0 0 0 1px var(--blue); }
  50% { box-shadow: 0 0 0 1px transparent; }
}
.input-bar button {
  background: var(--blue);
  border: none;
  border-radius: 6px;
  color: #0d1117;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0 1.25rem;
  cursor: pointer;
}
.input-bar button:hover { filter: brightness(1.1); }

.input-error {
  color: var(--red);
  font-size: 0.85rem;
  margin: -0.4rem 0 0.6rem;
  padding: 0 0.25rem;
}

/* Tabs */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}
.tabs.primary {
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.75rem;
}
.tabs.secondary {
  margin-bottom: 0.75rem;
  gap: 0.4rem;
}
.tab, .subtab {
  background: transparent;
  border: none;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.5rem 0.85rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  position: relative;
}
.tab:hover, .subtab:hover { color: var(--text); }
.tab.active {
  color: var(--text);
  border-bottom-color: var(--blue);
  font-weight: 500;
}
.subtab {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.7rem;
}
.subtab.active {
  color: var(--text);
  border-color: var(--blue);
  background: rgba(88, 166, 255, 0.08);
}
/* tooltip */
.subtab[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  left: 0;
  top: 110%;
  z-index: 10;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.72rem;
  font-weight: 400;
  padding: 0.4rem 0.6rem;
  white-space: normal;
  width: max-content;
  max-width: 240px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

/* Panels */
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.subpanel { display: none; }
.subpanel.active { display: block; }

/* Record type pills */
.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 0.75rem;
}
.pill {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.25rem 0.7rem;
  cursor: pointer;
}
.pill.active {
  color: var(--text);
  border-color: var(--green);
  background: rgba(63, 185, 80, 0.1);
}

/* Result blocks */
.result { margin-top: 0.5rem; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin-bottom: 0.75rem;
  position: relative;
}
.card h3 {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
th, td {
  text-align: left;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  word-break: break-word;
}
th {
  color: var(--muted);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.03em;
}
tr:last-child td { border-bottom: none; }

pre.raw {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
  overflow-x: auto;
  font-size: 0.8rem;
  margin: 0.4rem 0;
  white-space: pre-wrap;
  word-break: break-all;
}

.badge {
  display: inline-block;
  border-radius: 999px;
  padding: 0.15rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.badge.green { background: rgba(63,185,80,0.15); color: var(--green); border: 1px solid var(--green); }
.badge.yellow { background: rgba(210,153,34,0.15); color: var(--yellow); border: 1px solid var(--yellow); }
.badge.red { background: rgba(248,81,73,0.15); color: var(--red); border: 1px solid var(--red); }
.badge.grey { background: rgba(139,148,158,0.15); color: var(--muted); border: 1px solid var(--muted); }
.badge.blue { background: rgba(88,166,255,0.15); color: var(--blue); border: 1px solid var(--blue); }

.ok { color: var(--green); }
.warn { color: var(--yellow); }
.err { color: var(--red); }
.muted { color: var(--muted); }

/* Grade badge, big */
.grade {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 8px;
  font-size: 1.8rem;
  font-weight: 700;
}
.grade.A { background: rgba(63,185,80,0.15); color: var(--green); border: 2px solid var(--green); }
.grade.B { background: rgba(63,185,80,0.12); color: var(--green); border: 2px solid var(--green); }
.grade.C { background: rgba(210,153,34,0.15); color: var(--yellow); border: 2px solid var(--yellow); }
.grade.F { background: rgba(248,81,73,0.15); color: var(--red); border: 2px solid var(--red); }

/* Copy button */
.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
}
.copy-btn:hover { color: var(--text); border-color: var(--blue); }

/* Spinner */
.spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 0.5rem;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading { color: var(--muted); padding: 0.5rem 0; }

/* Util tool layout */
.util-io {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}
.util-io textarea, textarea.mono {
  width: 100%;
  min-height: 8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 0.6rem 0.75rem;
  resize: vertical;
  outline: none;
}
.util-io textarea:focus, textarea.mono:focus { border-color: var(--blue); }
.btn-row { display: flex; gap: 0.5rem; margin: 0.5rem 0; flex-wrap: wrap; align-items: center; }
.btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 0.4rem 0.85rem;
}
.btn:hover { border-color: var(--blue); }
.btn.primary { background: var(--blue); color: #0d1117; border-color: var(--blue); font-weight: 700; }

.field-label { color: var(--muted); font-size: 0.78rem; margin-bottom: 0.25rem; display: block; }
input.text-input, select.text-input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.5rem 0.7rem;
  outline: none;
}
input.text-input:focus { border-color: var(--blue); }

.note {
  color: var(--muted);
  font-size: 0.78rem;
  border-left: 2px solid var(--blue);
  padding-left: 0.6rem;
  margin: 0.5rem 0;
}
.privacy-note {
  color: var(--green);
  font-size: 0.78rem;
  border-left: 2px solid var(--green);
  padding-left: 0.6rem;
  margin: 0.5rem 0;
}

.summary {
  font-size: 0.9rem;
  padding: 0.6rem 0.85rem;
  border-radius: 6px;
  margin-bottom: 0.6rem;
}
.summary.green { background: rgba(63,185,80,0.1); border: 1px solid var(--green); }
.summary.yellow { background: rgba(210,153,34,0.1); border: 1px solid var(--yellow); }
.summary.red { background: rgba(248,81,73,0.1); border: 1px solid var(--red); }
.summary.grey { background: var(--surface); border: 1px solid var(--border); }

/* Redirect / routing chain */
.chain { list-style: none; padding: 0; margin: 0.4rem 0; }
.chain li {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 0.4rem;
  background: var(--bg);
  position: relative;
}
.chain li::after {
  content: '↓';
  position: absolute;
  left: 50%;
  bottom: -1.05rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.chain li:last-child::after { content: ''; }

details { margin-top: 0.5rem; }
details summary { cursor: pointer; color: var(--blue); font-size: 0.85rem; }

footer {
  max-width: 960px;
  margin: 2rem auto 1rem;
  padding: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
  line-height: 1.7;
}

@media (min-width: 640px) {
  .util-io.two-col { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  header h1 { font-size: 1.3rem; }
  main { padding: 0.75rem; }
  .tab, .subtab { padding: 0.4rem 0.6rem; font-size: 0.8rem; }
}