:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #eef1f8;
  --text: #16203a;
  --muted: #5b6477;
  --border: #d9deea;
  --primary: #1d4ed8;
  --primary-hover: #1e40af;
  --primary-text: #ffffff;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --ok: #15803d;
  --ok-bg: #dcfce7;
  --perm: #1d4ed8;
  --perm-bg: #dbeafe;
  --temp: #b45309;
  --temp-bg: #fef3c7;
  --err: #b91c1c;
  --err-bg: #fee2e2;
  --info: #0e7490;
  --info-bg: #cffafe;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(22, 32, 58, 0.06), 0 6px 20px rgba(22, 32, 58, 0.06);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1522;
    --surface: #171f31;
    --surface-2: #1f2940;
    --text: #e6eaf3;
    --muted: #9aa5bd;
    --border: #2b3650;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-text: #0b1220;
    --accent: #a78bfa;
    --accent-hover: #c4b5fd;
    --ok: #4ade80;
    --ok-bg: #14321f;
    --perm: #93c5fd;
    --perm-bg: #1e2f52;
    --temp: #fbbf24;
    --temp-bg: #3a2c0c;
    --err: #f87171;
    --err-bg: #3f1818;
    --info: #67e8f9;
    --info-bg: #0f2f38;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--surface-2);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.mono {
  font-family: var(--mono);
  font-size: 0.9em;
  word-break: break-all;
}

.muted {
  color: var(--muted);
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--primary);
  color: var(--primary-text);
  padding: 8px 12px;
  border-radius: 6px;
  z-index: 10;
}

.skip:focus {
  left: 8px;
}

/* Header & footer */
.site-header,
.site-footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.brand strong {
  color: var(--primary);
}

.logo {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.lang-switch {
  display: flex;
  gap: 4px;
}

.lang-switch a {
  text-decoration: none;
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.9rem;
}

.lang-switch a:hover {
  background: var(--surface-2);
}

.lang-switch a.active {
  background: var(--surface-2);
  color: var(--text);
  font-weight: 600;
}

.site-footer {
  margin-top: 56px;
  padding-top: 24px;
  padding-bottom: 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
}

.footer-nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Layout */
main {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 16px;
}

main.narrow {
  max-width: 760px;
}

.hero {
  text-align: center;
  padding: 28px 0 20px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1.15;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 720px;
  margin: 0 auto;
}

/* Tool */
.tool {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 8px 20px 20px;
}

.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  margin: 0 -20px 20px;
  padding: 0 12px;
}

.tabs [role="tab"] {
  background: none;
  border: 0;
  border-bottom: 3px solid transparent;
  padding: 12px 14px;
  font: inherit;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  margin-bottom: -1px;
}

.tabs [role="tab"][aria-selected="true"] {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tabs [role="tab"]:focus-visible,
.btn:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--primary) 45%, transparent);
  outline-offset: 2px;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

.input-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.input-row input {
  flex: 1 1 280px;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 11px 13px;
  min-height: 46px;
}

textarea {
  font-family: var(--mono);
  font-size: 0.92rem;
  resize: vertical;
  line-height: 1.5;
}

.hint {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 8px 0 0;
  min-height: 1em;
}

.btn {
  font: inherit;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 11px 18px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--surface-2);
}

.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-text);
}

.btn.primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn.accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn.accent:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn[disabled] {
  opacity: 0.6;
  cursor: progress;
}

.actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 12px;
}

.progress {
  color: var(--muted);
  font-size: 0.92rem;
}

/* Results */
.result {
  margin-top: 20px;
}

.result:empty {
  display: none;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: var(--surface);
}

.card-title {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.error-msg {
  color: var(--err);
  background: var(--err-bg);
  border-radius: 8px;
  padding: 10px 14px;
  margin: 0;
}

.badge {
  display: inline-block;
  min-width: 3.1em;
  text-align: center;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 2px 8px;
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface-2);
  line-height: 1.5;
  vertical-align: middle;
}

.badge.sm {
  font-size: 0.75rem;
  min-width: 2.6em;
  padding: 1px 6px;
}

.badge.s-2xx {
  color: var(--ok);
  background: var(--ok-bg);
}

.badge.s-perm {
  color: var(--perm);
  background: var(--perm-bg);
}

.badge.s-temp {
  color: var(--temp);
  background: var(--temp-bg);
}

.badge.s-err {
  color: var(--err);
  background: var(--err-bg);
}

.chain {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.hop {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}

.hop:last-child {
  border-bottom: 0;
}

.hop-n {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.hop-line {
  display: flex;
  gap: 10px;
  align-items: baseline;
  flex-wrap: wrap;
}

.hop-url {
  font-family: var(--mono);
  font-size: 0.9rem;
  word-break: break-all;
  flex: 1 1 200px;
}

.hop-time {
  color: var(--muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

.hop-name {
  color: var(--muted);
  font-size: 0.85rem;
}

.hop-arrow {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 4px;
  word-break: break-all;
}

.hop-arrow em {
  color: var(--err);
  font-style: normal;
  font-weight: 600;
}

.hop-error {
  color: var(--err);
  font-weight: 600;
  font-size: 0.9rem;
}

.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 0 0 16px;
  padding: 14px;
  background: var(--surface-2);
  border-radius: 8px;
}

.summary div {
  min-width: 0;
}

.summary dt {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.summary dd {
  margin: 2px 0 0;
  font-weight: 600;
}

.summary dd.mono {
  font-weight: 500;
}

.ok {
  color: var(--ok);
  font-weight: 600;
  margin: 0;
}

.warnings {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.warn {
  border-left: 4px solid var(--temp);
  background: var(--temp-bg);
  border-radius: 6px;
  padding: 10px 14px;
}

.warn p {
  margin: 4px 0 0;
  font-size: 0.95rem;
}

.warn-error {
  border-left-color: var(--err);
  background: var(--err-bg);
}

.warn-info {
  border-left-color: var(--info);
  background: var(--info-bg);
}

/* Bulk table */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

table.results {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 860px;
}

table.results th,
table.results td {
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

table.results th {
  background: var(--surface-2);
  font-weight: 600;
  white-space: nowrap;
  position: sticky;
  top: 0;
}

table.results tbody tr.row {
  cursor: pointer;
}

table.results tbody tr.row:hover {
  background: var(--surface-2);
}

table.results tr.has-error td:first-child {
  box-shadow: inset 3px 0 0 var(--err);
}

table.results tr.has-warning td:first-child {
  box-shadow: inset 3px 0 0 var(--temp);
}

table.results td.url-cell {
  max-width: 320px;
  word-break: break-all;
}

table.results tr.detail td {
  background: var(--bg);
  padding: 14px 18px;
}

.arr {
  color: var(--muted);
  margin: 0 3px;
}

.tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 1px 8px;
  margin: 1px 2px 1px 0;
  background: var(--temp-bg);
  color: var(--temp);
}

.tag-error {
  background: var(--err-bg);
  color: var(--err);
}

.tag-info {
  background: var(--info-bg);
  color: var(--info);
}

.tag-ok {
  background: var(--ok-bg);
  color: var(--ok);
}

/* Pre-order */
.preorder {
  max-width: 800px;
  margin: 28px auto 0;
}

.preorder-inner {
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 12%, var(--surface)), var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: var(--radius);
  padding: 22px 24px;
}

.preorder h2 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.preorder p {
  margin: 0 0 14px;
}

.preorder-panel {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.preorder-panel h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
}

.note {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 10px 0 0;
}

.msg {
  margin: 10px 0 0;
  font-weight: 600;
}

.msg.ok {
  color: var(--ok);
}

.msg.err {
  color: var(--err);
}

.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Text content: a centred reading column, same centre line as the tool above */
.content {
  max-width: 800px;
  margin: 48px auto 0;
}

.text-section {
  margin-bottom: 36px;
}

.content h2 {
  font-size: 1.5rem;
  line-height: 1.3;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.content h3 {
  font-size: 1.1rem;
  margin: 18px 0 6px;
}

.content ul,
.content ol {
  padding-left: 1.3em;
}

.content li {
  margin-bottom: 6px;
}

.codes {
  margin: 0 0 16px;
  display: grid;
  gap: 12px;
}

.codes dt {
  font-weight: 600;
  display: flex;
  gap: 8px;
  align-items: center;
}

.codes dd {
  margin: 4px 0 0;
  color: var(--muted);
}

.faq-item {
  border-top: 1px solid var(--border);
  padding-top: 8px;
}

.faq-item h3 {
  margin-top: 10px;
}

.faq-item p {
  margin-top: 0;
}

.legal h1 {
  margin-bottom: 4px;
}

.legal h2 {
  font-size: 1.2rem;
  margin-top: 28px;
}

@media (max-width: 600px) {
  .tool {
    padding: 4px 14px 16px;
  }

  .tabs {
    margin: 0 -14px 16px;
    padding: 0 6px;
  }

  .tabs [role="tab"] {
    padding: 12px 10px;
    font-size: 0.95rem;
  }

  .input-row .btn {
    width: 100%;
  }

  .summary {
    grid-template-columns: 1fr;
  }

  .site-header,
  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}