:root {
  --bg: #0B0E14;
  --panel: #12161F;
  --line: #232838;
  --amber: #FFB000;
  --red: #D84040;
  --teal: #4FD1C5;
  --text: #E8E6DF;
  --muted: #7C8394;

  --font-mono: 'IBM Plex Mono', "DejaVu Sans Mono", Monaco, monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-lg: 1.125rem;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #F5F3EC;
    --panel: #FFFFFF;
    --line: #E1DDD0;
    --amber: #B4600A;
    --red: #740A03;
    --teal: #008080;
    --text: #1C1E24;
    --muted: #6B6E78;
  }
}

* {
  box-sizing: border-box;
}

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }

body {
  margin: 0;
  color: var(--text);

  background-color: var(--bg);
  font-family: 'IBM Plex Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

a {
  color: inherit;
}

samp {
  font-family: var(--font-mono);
  display: inline;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem clamp(0.5rem, 3vw, 1.5rem);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg), transparent 10%);
  position: sticky;
  top: 0;
}

header .brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  font-weight: normal;
  font-family: var(--font-mono);
  margin: 0;
}
header .brand .prompt {
  color: var(--amber);
}
header nav.links {
    display: flex;
    align-items: center;
    gap: 1.6rem;
    font-size: var(--text-sm);
}
header nav.links a {
  text-decoration: none;
  color: var(--muted);
}

main {
  max-width: 1024px;
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 3.5rem) clamp(0.5rem, 3vw, 1.5rem) 2rem;
}

h2 {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0 0 1rem;
  color: var(--text);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: clamp(0.5rem, 3vw, 2rem);
  margin-bottom: 1.5rem;
}

.kv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.1rem 1.5rem;
}
.kv-grid + .kv-grid {
  margin-top: 1.1rem;
}
.kv-grid .kv dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06rem;
  margin-bottom: 0.25rem;
}
.kv-grid .kv dd {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.flag {
  max-height: 22px;
}

.isp-logo {
  max-height: 22px;
}

.header-list {
  display: flex;
  flex-direction: column;
  margin-top: 1rem;
}

.header-list .header-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1rem;
  padding: 0.6rem 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  border-top: 1px solid var(--line);
}
.header-list .key {
  color: var(--teal);
}

.header-list  .value {
  color: var(--muted);
  font-size: var(--text-sm);
  word-break: break-all;
}

.ip-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.4rem 0;
}

.ip-row .ip-label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.ip-row .ip-value {
  font-family: var(--font-mono);
  font-size: clamp(0.8rem, 3vw, 2.1rem);
  font-weight: 500;
  color: var(--teal);
  word-break: break-all;
}

#dual-stack.warning {
  border-color: var(--amber);
}
#dual-stack.warning p {
  color: var(--amber);
}

p.error, samp.error {
  color: var(--red);
}

#route-split {
  border-top: 1px solid var(--amber);
}
#route-split p {
  font-size: var(--text-sm);
}

.icon-with-value {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.icon-with-value .icon {
  height: 1.1rem;
  width: 1.1rem;
}

@media (max-width: 520px) {
  .header-list .header-row {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .ip-row {
    display: block;
  }
}

footer {
  text-align: center;
  padding: 1.5rem 1.5rem 2rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

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