:root {
  color-scheme: light;
  --jump-offset: 28px;
  --jump-nav-gap: 18px;
  --bg: #eef3f9;
  --bg-accent: radial-gradient(circle at top left, rgba(52, 114, 226, 0.10), transparent 34%), linear-gradient(180deg, #f5f8fc 0%, #eaf0f8 100%);
  --panel: rgba(255, 255, 255, 0.94);
  --panel-2: #f7f9fd;
  --text: #1b2a41;
  --muted: #60728d;
  --border: #d8e1ee;
  --border-strong: #c7d4e6;
  --link: #225ca8;
  --input-bg: #ffffff;
  --table-head: #f3f6fb;
  --chip-bg: #edf3fb;
  --chip-text: #3c6ba9;
  --button-bg: #225ca8;
  --button-bg-hover: #1a4d8f;
  --pass-bg: #e8f7ee;
  --pass-text: #17633a;
  --warn-bg: #fff4d8;
  --warn-text: #8b6200;
  --fail-bg: #fdeaea;
  --fail-text: #a61f1f;
  --info-bg: #eaf2fd;
  --info-text: #31588d;
  --shadow: 0 14px 36px rgba(25, 45, 78, 0.08);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1220;
  --bg-accent: radial-gradient(circle at top left, rgba(79, 140, 255, 0.18), transparent 32%), linear-gradient(180deg, #0b1220 0%, #0d1526 100%);
  --panel: rgba(16, 24, 40, 0.94);
  --panel-2: #141d30;
  --text: #e8eef9;
  --muted: #9dafc9;
  --border: #22304a;
  --border-strong: #31415f;
  --link: #95bbff;
  --input-bg: #111a2b;
  --table-head: #101827;
  --chip-bg: #13203a;
  --chip-text: #9ec4ff;
  --button-bg: #2d68c4;
  --button-bg-hover: #3c78d6;
  --pass-bg: rgba(24, 111, 61, 0.26);
  --pass-text: #9fe5bd;
  --warn-bg: rgba(140, 92, 0, 0.25);
  --warn-text: #f7d27b;
  --fail-bg: rgba(147, 33, 33, 0.24);
  --fail-text: #ffb2b2;
  --info-bg: rgba(40, 87, 153, 0.26);
  --info-text: #b1d2ff;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.34);
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--jump-offset);
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif;
  color: var(--text);
  background: var(--bg-accent);
}

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

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 24px 56px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
  backdrop-filter: blur(10px);
}

.form-panel, .summary-panel { padding: 18px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.form-grid {
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr) auto auto;
  align-items: end;
}
.grid-optional { margin-top: 12px; }
label span,
.field-label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}
.theme-toggle-field,
.checkbox-field {
  display: flex;
  flex-direction: column;
  align-self: stretch;
  min-width: 140px;
}
.field-help {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}
input {
  width: 100%;
  padding: 11px 12px;
  border-radius: 11px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
input::placeholder { color: var(--muted); }
input:focus {
  border-color: var(--link);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--link) 20%, transparent);
}
.actions {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.advanced-options {
  margin-top: 14px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel-2);
}
.advanced-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}
.advanced-head h3 {
  margin: 0 0 4px;
  font-size: 16px;
}
.advanced-head p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}
button {
  border: 0;
  border-radius: 11px;
  background: var(--button-bg);
  color: #fff;
  padding: 11px 16px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s ease, transform .05s ease;
}
button:hover { background: var(--button-bg-hover); }
button:active { transform: translateY(1px); }
button:disabled { opacity: 0.65; cursor: default; }
.secondary-btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}
.secondary-btn:hover {
  background: var(--panel);
  border-color: var(--link);
  color: var(--link);
}
.hint { color: var(--muted); font-size: 14px; }
.error {
  margin-top: 12px;
  color: var(--fail-text);
  background: var(--fail-bg);
  border: 1px solid color-mix(in srgb, var(--fail-text) 26%, transparent);
  padding: 10px 12px;
  border-radius: 10px;
}
.hidden { display: none; }

.summary-top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}
.summary-top h2 {
  margin: 0 0 4px;
  font-size: 26px;
}
.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.pill {
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 800;
  border: 1px solid color-mix(in srgb, var(--border-strong) 60%, transparent);
  user-select: none;
  -webkit-user-select: none;
}
.pill strong { margin-left: 6px; }
.filter-pill {
  appearance: none;
  -webkit-appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  box-shadow: none;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}
.filter-pill:hover {
  transform: none;
  border-color: var(--link);
  background: var(--panel-2);
}
.filter-pill strong {
  pointer-events: none;
}
.filter-pill.all {
  background: var(--panel-2);
  color: var(--text);
}
.filter-pill.is-active {
  border-color: var(--link);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--link) 22%, transparent);
}
.filter-pill,
.filter-pill * {
  cursor: pointer;
}
.pass { background: var(--pass-bg); color: var(--pass-text); }
.warn { background: var(--warn-bg); color: var(--warn-text); }
.fail { background: var(--fail-bg); color: var(--fail-text); }
.info { background: var(--info-bg); color: var(--info-text); }

.summary-status {
  margin-top: 14px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: stretch;
}
.phase-banner {
  margin-top: 0;
  flex: 1 1 340px;
  border-radius: 11px;
  padding: 12px 14px;
  font-weight: 700;
  border: 1px solid transparent;
  display: flex;
  align-items: center;
}
.phase-queued, .phase-phase1 {
  background: var(--info-bg);
  color: var(--info-text);
  border-color: color-mix(in srgb, var(--info-text) 20%, transparent);
}
.phase-phase2 {
  background: color-mix(in srgb, var(--info-bg) 80%, var(--panel));
  color: var(--info-text);
  border-color: color-mix(in srgb, var(--info-text) 22%, transparent);
}
.phase-done {
  background: var(--pass-bg);
  color: var(--pass-text);
  border-color: color-mix(in srgb, var(--pass-text) 20%, transparent);
}
.phase-error {
  background: var(--fail-bg);
  color: var(--fail-text);
  border-color: color-mix(in srgb, var(--fail-text) 22%, transparent);
}

.metrics {
  display: flex;
  gap: 10px;
  margin-top: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: stretch;
}
.metrics div {
  min-width: 118px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px 9px;
}
.metrics span {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.metrics strong {
  display: block;
  margin-top: 4px;
  font-size: 17px;
  color: var(--text);
}
.request-note {
  margin-top: 14px;
  border-radius: 11px;
  padding: 11px 13px;
  background: var(--info-bg);
  color: var(--info-text);
  border: 1px solid color-mix(in srgb, var(--info-text) 18%, transparent);
  font-size: 14px;
  line-height: 1.45;
}
.report-guidance {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.guidance-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.guidance-head strong {
  font-size: 15px;
}
.guidance-head span {
  color: var(--muted);
  font-size: 13px;
}
.guidance-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}
.guidance-card {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel-2);
}
.guidance-card h3 {
  margin: 0 0 6px;
  font-size: 15px;
}
.guidance-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}
.guidance-btn {
  margin-top: 12px;
}

.jump-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.jump-nav-shell {
  position: sticky;
  top: 0;
  z-index: 30;
  margin-bottom: var(--jump-nav-gap);
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}
.jump-nav a {
  text-decoration: none;
  color: var(--chip-text);
  background: var(--chip-bg);
  border: 1px solid var(--border);
  padding: 8px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
}
.jump-nav a:hover {
  border-color: var(--link);
  color: var(--link);
}
.jump-nav a:first-child {
  font-weight: 700;
}

.report-section {
  overflow: hidden;
  scroll-margin-top: var(--jump-offset);
}
.report-section h3 {
  margin: 0;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 22px;
}
.empty-copy {
  padding: 18px 16px 20px;
  color: var(--muted);
  font-size: 15px;
}
.results-table {
  width: 100%;
  border-collapse: collapse;
}
.results-table th,
.results-table td {
  text-align: left;
  vertical-align: top;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.results-table th {
  background: var(--table-head);
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.results-table tbody tr:hover {
  background: color-mix(in srgb, var(--panel-2) 75%, transparent);
}
.status-cell { width: 110px; }
.test-cell { width: 260px; font-weight: 700; }
.badge {
  display: inline-block;
  padding: 6px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  border: 1px solid color-mix(in srgb, var(--border-strong) 60%, transparent);
}
.summary { margin-bottom: 4px; }
.info-cell ul { margin: 6px 0 0 18px; padding: 0; }
.info-cell li { margin: 4px 0; }

.theme-toggle {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 14px;
  min-height: 45px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}
.theme-toggle:hover { border-color: var(--link); color: var(--link); }

.checkbox-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 45px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.checkbox-toggle:hover {
  border-color: var(--link);
}
.checkbox-toggle span {
  display: inline;
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.checkbox-toggle input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--button-bg);
  cursor: pointer;
}

@media (max-width: 860px) {
  .page { padding: 18px 14px 40px; }
  .grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .theme-toggle-field,
  .checkbox-field { min-width: 0; }
  .theme-toggle { width: 100%; }
  .summary-top { flex-direction: column; }
  .summary-status { flex-direction: column; }
  .metrics { justify-content: flex-start; }
  .advanced-head { flex-direction: column; }
  :root { --jump-offset: 24px; }
  .jump-nav-shell {
    top: 8px;
    padding: 10px 12px;
  }
  .results-table,
  .results-table thead,
  .results-table tbody,
  .results-table tr,
  .results-table th,
  .results-table td { display: block; width: 100%; }
  .results-table thead { display: none; }
  .results-table td { border-bottom: 0; padding-top: 8px; padding-bottom: 8px; }
  .results-table tr { border-bottom: 1px solid var(--border); padding: 8px 0; }
}

.info-cell .summary { margin-bottom: 8px; }
.detail-lines {
  margin: 8px 0 0;
  padding: 10px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  font: 13px/1.55 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
}
.smtp-detail-list {
  margin-top: 8px;
  display: grid;
  gap: 12px;
}
.smtp-host-block {
  padding: 11px 13px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  font: 13px/1.55 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  color: var(--text);
}
.smtp-host-title {
  margin-bottom: 7px;
  font-weight: 700;
  color: var(--text);
}
.smtp-host-line + .smtp-host-line {
  margin-top: 2px;
}