*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0d1117;
  --bg-card:   #161b22;
  --bg-input:  #0d1117;
  --border:    #30363d;
  --text:      #c9d1d9;
  --text-dim:  #8b949e;
  --heading:   #f0f6fc;
  --accent:    #2f81f7;
  --accent2:   #3fb950;
  --warn:      #d29922;
  --danger:    #f85149;
  --mono:      'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --sans:      -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --radius:    8px;
}

body { background: var(--bg); color: var(--text); font-family: var(--sans); font-size: 15px; line-height: 1.6; }

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

/* ── NAV ── */
nav {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex; align-items: center; gap: 32px;
  height: 56px; position: sticky; top: 0; z-index: 100;
}
.nav-brand { font-weight: 700; font-size: 17px; color: var(--heading); letter-spacing: -0.3px; }
.nav-brand span { color: var(--accent); }
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  color: var(--text-dim); padding: 6px 12px; border-radius: 6px;
  font-size: 14px; transition: background .15s, color .15s;
}
.nav-links a:hover, .nav-links a.active { background: #21262d; color: var(--heading); text-decoration: none; }

/* ── LAYOUT ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.page { padding: 40px 0 80px; }

/* ── HERO ── */
.hero { padding: 60px 0 40px; }
.hero h1 { font-size: 36px; font-weight: 700; color: var(--heading); line-height: 1.2; margin-bottom: 14px; }
.hero h1 span { color: var(--accent); }
.hero p { color: var(--text-dim); max-width: 560px; font-size: 16px; }

/* ── TOOL GRID ── */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; margin-top: 40px; }
.tool-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; transition: border-color .2s;
}
.tool-card:hover { border-color: var(--accent); }
.tool-card.soon { opacity: .55; pointer-events: none; }
.tool-card .badge {
  display: inline-block; font-size: 11px; font-weight: 600; padding: 2px 8px;
  border-radius: 20px; margin-bottom: 12px; text-transform: uppercase; letter-spacing: .5px;
}
.badge.live  { background: #1b4332; color: var(--accent2); }
.badge.soon  { background: #2d2a1a; color: var(--warn); }
.tool-card h3 { font-size: 16px; color: var(--heading); margin-bottom: 6px; }
.tool-card p  { font-size: 13px; color: var(--text-dim); }
.tool-card a.card-link { display: block; margin-top: 14px; font-size: 13px; font-weight: 600; color: var(--accent); }

/* ── TOOL PAGE ── */
.tool-header { margin-bottom: 32px; }
.tool-header h1 { font-size: 28px; color: var(--heading); margin-bottom: 8px; }
.tool-header p  { color: var(--text-dim); max-width: 640px; }

/* ── CARD ── */
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; }
.card h2 { font-size: 15px; font-weight: 600; color: var(--heading); margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }

/* ── FORM ── */
label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; font-weight: 500; }
input[type=text], input[type=number], select {
  background: var(--bg-input); border: 1px solid var(--border); color: var(--text);
  border-radius: 6px; padding: 8px 12px; font-size: 14px; font-family: var(--mono);
  width: 100%; outline: none; transition: border-color .15s;
}
input:focus, select:focus { border-color: var(--accent); }
input::placeholder { color: var(--text-dim); opacity: .5; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px; border-radius: 6px; font-size: 14px; font-weight: 600;
  cursor: pointer; border: none; transition: background .15s, opacity .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #388bfd; }
.btn-secondary { background: #21262d; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: #2d333b; }
.btn-danger  { background: transparent; color: var(--danger); border: 1px solid var(--danger); padding: 4px 10px; font-size: 12px; }
.btn-danger:hover { background: #3d1a1a; }
.btn-add { background: #1b4332; color: var(--accent2); border: 1px solid #2ea04333; font-size: 13px; padding: 6px 14px; }
.btn-add:hover { background: #1f5038; }
.btn-row { display: flex; gap: 10px; margin-top: 16px; align-items: center; }

/* ── RESULTS TABLE ── */
.result-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { background: #161b22; color: var(--text-dim); font-weight: 600; text-align: left; padding: 10px 12px; border-bottom: 2px solid var(--border); white-space: nowrap; font-size: 12px; text-transform: uppercase; letter-spacing: .4px; }
td { padding: 10px 12px; border-bottom: 1px solid var(--border); font-family: var(--mono); font-size: 13px; white-space: nowrap; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #21262d44; }
td.name-col { font-family: var(--sans); font-weight: 500; color: var(--heading); }
td.prefix-col { color: var(--accent); font-weight: 700; }
td.hosts-col { color: var(--accent2); }

/* ── ADDRESS BAR ── */
.addr-bar-wrap { margin-top: 8px; }
.addr-bar { display: flex; height: 28px; border-radius: 6px; overflow: hidden; border: 1px solid var(--border); }
.addr-seg { display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 600; overflow: hidden; white-space: nowrap; transition: opacity .2s; cursor: default; }
.addr-seg:hover { opacity: .8; }
.addr-waste { background: #21262d; color: var(--text-dim); font-size: 11px; }
.addr-legend { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-dim); }
.legend-dot { width: 12px; height: 12px; border-radius: 3px; flex-shrink: 0; }

/* ── DETAIL GRID ── */
.detail-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.detail-item label { font-size: 11px; text-transform: uppercase; letter-spacing: .5px; margin-bottom: 4px; }
.detail-item .val { font-family: var(--mono); font-size: 15px; color: var(--heading); }

/* ── ALERTS ── */
.alert { padding: 12px 16px; border-radius: 6px; font-size: 13px; margin-bottom: 16px; }
.alert-err  { background: #3d1a1a; border: 1px solid var(--danger); color: var(--danger); }
.alert-ok   { background: #1b4332; border: 1px solid #2ea043; color: var(--accent2); }

/* ── SUBNET INPUT TABLE ── */
.subnet-inputs { width: 100%; border-collapse: collapse; margin-bottom: 12px; }
.subnet-inputs th { font-size: 12px; text-transform: uppercase; letter-spacing: .4px; color: var(--text-dim); padding: 6px 8px; text-align: left; border-bottom: 1px solid var(--border); }
.subnet-inputs td { padding: 5px 4px; vertical-align: middle; }
.subnet-inputs input { padding: 7px 10px; }
.subnet-inputs .col-name { width: 40%; }
.subnet-inputs .col-hosts { width: 35%; }
.subnet-inputs .col-act { width: 80px; text-align: center; }

/* ── SEO CONTENT ── */
.seo-section { margin-top: 48px; }
.seo-section h2 { font-size: 20px; color: var(--heading); margin-bottom: 12px; }
.seo-section h3 { font-size: 16px; color: var(--heading); margin: 20px 0 8px; }
.seo-section p  { color: var(--text-dim); margin-bottom: 12px; font-size: 14px; line-height: 1.7; }
.seo-section code { background: #21262d; color: var(--accent); padding: 2px 6px; border-radius: 4px; font-family: var(--mono); font-size: 13px; }

/* ── FOOTER ── */
footer { border-top: 1px solid var(--border); padding: 24px; text-align: center; color: var(--text-dim); font-size: 13px; }
footer a { color: var(--text-dim); }

/* ── UTIL ── */
.hidden { display: none !important; }
.mono { font-family: var(--mono); }
.text-dim { color: var(--text-dim); }
.mt-4 { margin-top: 16px; }
.stats-row { display: flex; gap: 24px; flex-wrap: wrap; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.stat { display: flex; flex-direction: column; }
.stat .s-val { font-family: var(--mono); font-size: 18px; color: var(--heading); font-weight: 700; }
.stat .s-lbl { font-size: 11px; text-transform: uppercase; letter-spacing: .5px; color: var(--text-dim); }

@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
  nav { gap: 16px; }
  .nav-links { display: none; }
}