:root {
  --bg: #0b0d12;
  --bg-elev: #12151c;
  --bg-elev-2: #181c26;
  --border: #262b38;
  --text: #e7e9ee;
  --text-dim: #9099ab;
  --text-faint: #626a7d;
  --accent: #5b9dff;
  --accent-dim: #2a4d8a;
  --good: #3ecf8e;
  --good-bg: rgba(62, 207, 142, 0.12);
  --warn: #f5a623;
  --warn-bg: rgba(245, 166, 35, 0.12);
  --bad: #ff5d6c;
  --bad-bg: rgba(255, 93, 108, 0.12);
  --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.35);
}

:root[data-theme="light"] {
  --bg: #f5f6f8;
  --bg-elev: #ffffff;
  --bg-elev-2: #eef0f4;
  --border: #dde1e8;
  --text: #1a1d24;
  --text-dim: #565f70;
  --text-faint: #8993a6;
  --accent: #2563eb;
  --accent-dim: #dbe6ff;
  --good: #16a366;
  --good-bg: rgba(22, 163, 102, 0.1);
  --warn: #b3720a;
  --warn-bg: rgba(179, 114, 10, 0.12);
  --bad: #d92d3e;
  --bad-bg: rgba(217, 45, 62, 0.1);
  --shadow: 0 4px 24px rgba(20,20,30,0.08);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f5f6f8;
    --bg-elev: #ffffff;
    --bg-elev-2: #eef0f4;
    --border: #dde1e8;
    --text: #1a1d24;
    --text-dim: #565f70;
    --text-faint: #8993a6;
    --accent: #2563eb;
    --accent-dim: #dbe6ff;
    --good: #16a366;
    --good-bg: rgba(22, 163, 102, 0.1);
    --warn: #b3720a;
    --warn-bg: rgba(179, 114, 10, 0.12);
    --bad: #d92d3e;
    --bad-bg: rgba(217, 45, 62, 0.1);
    --shadow: 0 4px 24px rgba(20,20,30,0.08);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
}

a { color: var(--accent); }

.hidden { display: none !important; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-mark { font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.brand-mark .accent { color: var(--accent); }
.brand-sub { color: var(--text-faint); font-size: 12px; display: none; }
@media (min-width: 640px) { .brand-sub { display: inline; } }

.topbar-actions { display: flex; gap: 8px; }
.icon-btn {
  display: flex; align-items: center; justify-content: center;
  width: 34px; height: 34px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  cursor: pointer;
  transition: background .15s, color .15s;
}
.icon-btn:hover { background: var(--bg-elev-2); color: var(--text); }

.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  max-width: 1200px;
  margin: 0 auto;
}
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .history-panel { display: none; }
  .history-panel.open { display: block; }
}

.history-panel {
  border-right: 1px solid var(--border);
  padding: 16px;
  min-height: calc(100vh - 60px);
}
.panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.panel-head h3 { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-faint); }
.history-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.history-list .empty { color: var(--text-faint); font-size: 13px; padding: 8px 0; }
.history-item {
  display: block; width: 100%; text-align: left;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--text);
  cursor: pointer;
  font-size: 12.5px;
}
.history-item:hover { border-color: var(--accent); }
.history-item .h-targets { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.history-item .h-meta { color: var(--text-faint); font-size: 11px; margin-top: 2px; }

.main { padding: 20px; display: flex; flex-direction: column; gap: 18px; min-width: 0; }

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.card-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.card-head h2 { margin: 0; font-size: 15px; }

.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.field > label { display: block; font-weight: 600; font-size: 12.5px; margin-bottom: 8px; }
.hint { font-weight: 400; color: var(--text-faint); font-size: 11.5px; margin-left: 6px; }

textarea, input[type="text"] {
  width: 100%;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 13px;
  resize: vertical;
}
textarea:focus, input[type="text"]:focus { outline: none; border-color: var(--accent); }

.pill-row { display: flex; flex-wrap: wrap; gap: 6px; }
.pill {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev-2);
  color: var(--text-dim);
  font-size: 12.5px;
  cursor: pointer;
  user-select: none;
  transition: all .12s;
}
.pill:hover { border-color: var(--accent); color: var(--text); }
.pill.active { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); font-weight: 600; }
.pill.ns-pill.active { color: var(--good); border-color: var(--good); background: var(--good-bg); }
.pill .pill-remove { margin-left: 6px; opacity: .6; }

.pill-row-actions { display: flex; gap: 12px; margin-top: 8px; }

.ns-add { display: flex; gap: 8px; margin-top: 8px; }
.ns-add input { flex: 1; }

.options-row { display: flex; flex-wrap: wrap; gap: 14px 20px; }
.checkbox { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-dim); cursor: pointer; }
.checkbox input { accent-color: var(--accent); width: 15px; height: 15px; }

.actions-row { display: flex; align-items: center; gap: 12px; margin-top: 18px; flex-wrap: wrap; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 20px;
  font-weight: 600;
  font-size: 13.5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; }

.btn-secondary {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 13.5px;
  cursor: pointer;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--text); }
.btn-secondary { display: inline-flex; align-items: center; gap: 8px; }
.btn-secondary:disabled { opacity: .6; cursor: not-allowed; }

.spinner-dark { border-color: rgba(120,130,150,.35); border-top-color: var(--text-dim); }

.text-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 12.5px;
  cursor: pointer;
  padding: 2px 4px;
}
.text-btn:hover { text-decoration: underline; }

.error-msg { color: var(--bad); font-size: 12.5px; }

.spinner {
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.results-section { display: flex; flex-direction: column; gap: 18px; }

.matrix-wrap { overflow-x: auto; }
table.matrix { border-collapse: collapse; width: 100%; font-size: 12.5px; }
table.matrix th, table.matrix td {
  border: 1px solid var(--border);
  padding: 7px 10px;
  text-align: left;
  white-space: nowrap;
}
table.matrix th { background: var(--bg-elev-2); font-weight: 600; position: sticky; top: 0; }
table.matrix td.ns-col { font-weight: 600; background: var(--bg-elev-2); position: sticky; left: 0; }
table.matrix td.cell-ok { background: var(--good-bg); color: var(--good); }
table.matrix td.cell-mismatch { background: var(--warn-bg); color: var(--warn); }
table.matrix td.cell-err { background: var(--bad-bg); color: var(--bad); }
table.matrix td.cell-empty { color: var(--text-faint); }
table.matrix .cell-value { max-width: 260px; overflow: hidden; text-overflow: ellipsis; display: inline-block; vertical-align: bottom; }

.export-btns { display: flex; gap: 14px; }

.results-list { display: flex; flex-direction: column; gap: 8px; }
.result-item { border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.result-head {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg-elev-2);
  border: none;
  color: var(--text);
  cursor: pointer;
  font-size: 12.5px;
  text-align: left;
}
.result-head .chev { margin-left: auto; color: var(--text-faint); transition: transform .15s; flex-shrink: 0; }
.result-head.open .chev { transform: rotate(180deg); }
.result-badge {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 5px;
  background: var(--accent-dim);
  color: var(--accent);
  flex-shrink: 0;
}
.result-target { font-family: var(--mono); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.result-ns { color: var(--text-faint); font-family: var(--mono); flex-shrink: 0; }
.result-dnssec {
  flex-shrink: 0;
  font-weight: 700;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 5px;
  cursor: help;
}
.result-dnssec.dnssec-ok { background: var(--good-bg); color: var(--good); }
.result-dnssec.dnssec-bad { background: var(--bad-bg); color: var(--bad); }
.result-status { flex-shrink: 0; font-weight: 600; }
.result-status.ok { color: var(--good); }
.result-status.err { color: var(--bad); }
.result-time { color: var(--text-faint); flex-shrink: 0; font-family: var(--mono); font-size: 11px; }

.result-body { padding: 12px; border-top: 1px solid var(--border); }
table.answer-table { border-collapse: collapse; width: 100%; font-family: var(--mono); font-size: 12px; margin-bottom: 10px; }
table.answer-table td { padding: 4px 8px; border-bottom: 1px solid var(--border); color: var(--text-dim); }
table.answer-table td.data-col { color: var(--text); word-break: break-all; }

.raw-details summary { cursor: pointer; color: var(--text-faint); font-size: 12px; margin-bottom: 6px; }
pre.raw-output {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  overflow-x: auto;
  color: var(--text-dim);
  white-space: pre-wrap;
  word-break: break-all;
}

.footnote { color: var(--text-faint); font-size: 11.5px; text-align: center; margin: 10px 0 20px; }
.footnote a { color: var(--text-faint); text-decoration: underline; }
.footnote a:hover { color: var(--accent); }

/* DNSSEC detail card (shown on "Check DNSSEC" click) */
.dnssec-list { display: flex; flex-direction: column; gap: 10px; }
.dnssec-item { border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; }
.dnssec-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.dnssec-domain { font-family: var(--mono); font-weight: 600; font-size: 13.5px; }
.dnssec-chip {
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.dnssec-chip.chip-good { background: var(--good-bg); color: var(--good); }
.dnssec-chip.chip-warn { background: var(--warn-bg); color: var(--warn); }
.dnssec-chip.chip-bad { background: var(--bad-bg); color: var(--bad); }
.dnssec-detail { color: var(--text-dim); font-size: 12.5px; margin: 8px 0; }
.dnssec-facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 6px 16px; margin: 0; font-size: 12px; }
.dnssec-facts div { display: flex; justify-content: space-between; gap: 8px; border-top: 1px solid var(--border); padding-top: 4px; }
.dnssec-facts dt { color: var(--text-faint); font-weight: 400; }
.dnssec-facts dd { margin: 0; font-family: var(--mono); text-align: right; word-break: break-word; }
.dnssec-facts .f-algos-row, .dnssec-facts .f-dstags-row { grid-column: 1 / -1; }
.dnssec-facts .f-algos-row:has(dd:empty), .dnssec-facts .f-dstags-row:has(dd:empty) { display: none; }