:root {
  --bg: #0f1419;
  --bg-elevated: #1a222c;
  --text: #e8eef4;
  --muted: #9aabbc;
  --accent: #3d9cf0;
  --accent-dim: #2a6fa8;
  --border: #2a3542;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, #1c3a55 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #243049 0%, transparent 50%),
    var(--bg);
  line-height: 1.5;
}

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

.site-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.brand {
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-header nav a { color: var(--muted); }
.site-header nav a:hover { color: var(--text); }

.site-main {
  width: min(720px, 100%);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.site-footer {
  width: min(720px, 100%);
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.lede { color: var(--muted); margin: 0 0 1.5rem; font-size: 1.05rem; }

.tool-list {
  display: grid;
  gap: 1rem;
}

.tool-link {
  display: block;
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg-elevated) 85%, transparent);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.tool-link:hover {
  border-color: var(--accent-dim);
  text-decoration: none;
  transform: translateY(-1px);
}

.tool-link h2 { margin: 0 0 0.35rem; font-size: 1.2rem; }
.tool-link p { margin: 0; color: var(--muted); }

.ip-primary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin: 1rem 0;
}

.ip-primary code,
.ip-card code {
  font-family: var(--mono);
  font-size: 1.25rem;
  word-break: break-all;
}

.ip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 2rem 0 1rem;
}

.ip-card {
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
}

.ip-card h2 {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
}

.btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 6px;
  padding: 0.4rem 0.85rem;
  cursor: pointer;
  font: inherit;
}

.btn:hover { border-color: var(--accent); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #061018;
  font-weight: 600;
}

.muted { color: var(--muted); }
.note { color: var(--muted); font-size: 0.95rem; margin-top: 1.5rem; }

.dns-form {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.dns-form label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.dns-form input,
.dns-form select {
  font: inherit;
  padding: 0.65rem 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
}

.dns-results {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  padding: 0.5rem 0.75rem 1rem;
}

.dns-results table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.dns-results th,
.dns-results td {
  text-align: left;
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.dns-results code {
  font-family: var(--mono);
  font-size: 0.88rem;
  word-break: break-all;
}

@media (max-width: 560px) {
  .site-header { align-items: flex-start; }
}