:root {
  --bg: #0b0f14; --panel: #121821; --panel2: #0e141c; --border: #1f2937;
  --text: #e5eef5; --muted: #8b98a8; --accent: #3ddc84; --accent2: #4fb0ff;
  --warn: #ffb454; --bad: #ff6b6b; --code-bg: #060a0e;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.55; min-height: 100vh;
}
.mono, code, pre, .out { font-family: "SFMono-Regular", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace; }

.wrap { max-width: 900px; margin: 0 auto; padding: 0 18px 80px; }

/* Header */
header.site { text-align: center; padding: 40px 0 10px; }
.brand { font-size: 30px; font-weight: 800; letter-spacing: -.5px; }
.brand .prompt { color: var(--accent); }
.brand .cursor { color: var(--accent); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.tagline { color: var(--muted); margin: 8px 0 0; font-size: 16px; }
.lede { color: var(--muted); max-width: 640px; margin: 10px auto 0; font-size: 14px; }

/* Tool nav */
.toolnav { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin: 22px 0 8px; }
.toolnav a { text-decoration: none; color: var(--text); background: var(--panel); border: 1px solid var(--border);
  padding: 8px 14px; border-radius: 8px; font-size: 13px; display: inline-flex; align-items: center; gap: 7px; }
.toolnav a:hover { border-color: var(--accent); color: var(--accent); }
.toolnav a.active { background: linear-gradient(135deg, var(--accent), #2fbf6f); color: #04120a; border-color: transparent; font-weight: 600; }
.toolnav .ico { font-size: 15px; }

/* Tool cards */
.tool { background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 24px; margin: 22px 0; scroll-margin-top: 20px; }
.tool.tool-tab { display: none; }
.tool.tool-tab.active { display: block; }
.tool h2 { margin: 0 0 4px; font-size: 20px; display: flex; align-items: center; gap: 10px; }
.tool h2 .ico { font-size: 22px; }
.tool .desc { color: var(--muted); font-size: 14px; margin: 0 0 18px; }

/* Forms */
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; }
.row.one { grid-template-columns: 1fr; }
.row.three { grid-template-columns: 1fr 1fr 1fr; }
@media (max-width: 620px) { .row, .row.three { grid-template-columns: 1fr; } }
label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
input[type=text], input[type=number], select, textarea {
  background: var(--panel2); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 10px 12px; font-size: 14px; width: 100%; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { resize: vertical; min-height: 60px; }

.checks { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 4px 0; }
.checks label { flex-direction: row; align-items: center; gap: 8px; color: var(--text); font-size: 14px; cursor: pointer; }
.checks input { width: auto; }

.btn { background: linear-gradient(135deg, var(--accent), #2fbf6f); color: #04120a; border: none;
  padding: 11px 22px; border-radius: 9px; font-size: 15px; font-weight: 700; cursor: pointer; margin-top: 14px; }
.btn:hover { filter: brightness(1.08); } .btn:active { transform: translateY(1px); }
.btn.sec { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* Output */
.out { background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; margin-top: 16px; font-size: 13px; white-space: pre-wrap; word-break: break-word;
  color: #cfe8d8; position: relative; min-height: 20px; }
.out:empty { display: none; }
.copy-btn { position: absolute; top: 8px; right: 8px; background: var(--panel); border: 1px solid var(--border);
  color: var(--muted); font-size: 12px; padding: 4px 10px; border-radius: 6px; cursor: pointer; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }

/* Result grid (subnet) */
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; font-size: 14px; }
.kv .k { color: var(--muted); } .kv .v { color: var(--text); }
.err { color: var(--bad); font-size: 13px; margin-top: 8px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 10px; }
.note { background: var(--panel2); border-left: 3px solid var(--accent); padding: 10px 14px; border-radius: 6px;
  font-size: 13px; color: var(--muted); margin-top: 14px; }
.note code { color: var(--accent); }

.rule-list { margin: 10px 0; }
.rule-item { display: flex; gap: 8px; align-items: flex-end; margin-bottom: 8px; flex-wrap: wrap; }
.rule-item .rm { background: transparent; border: 1px solid var(--border); color: var(--bad); border-radius: 6px; cursor: pointer; padding: 8px 10px; }

.ad-slot { min-height: 90px; display: flex; align-items: center; justify-content: center; color: #3a4a5a;
  border: 1px dashed var(--border); border-radius: 12px; margin: 20px 0; font-size: 13px; }

footer.site { text-align: center; color: var(--muted); font-size: 13px; margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--border); }
footer.site a { color: var(--muted); }
h1,h2,h3 { line-height: 1.25; }
a { color: var(--accent2); }