/* ============================================================
   Aitonet G.K. — NW Tools
   white-base / #727d88 monotone / near-future console
   fully self-contained: no external fonts or assets
   ============================================================ */

:root {
    --ink: #4a545e;            /* strong text */
    --body: #727d88;           /* base text */
    --sub: #98a1ab;            /* secondary */
    --line: rgba(114, 125, 136, 0.28);
    --line-soft: rgba(114, 125, 136, 0.14);
    --accent: #727d88;
    --accent-dim: rgba(114, 125, 136, 0.35);
    --magenta: #e6007e;        /* rare accent */
    --bg: #ffffff;
    --panel-bg: rgba(114, 125, 136, 0.035);
    --hi: rgba(114, 125, 136, 0.07);
    --mono: ui-monospace, "SFMono-Regular", "Consolas", "Menlo", "DejaVu Sans Mono", monospace;
    --sans: "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Meiryo", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--body);
    font-family: var(--sans);
    font-weight: 400;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* faint hex-dot texture in the background */
body {
    background-image:
        radial-gradient(var(--line-soft) 1px, transparent 1px);
    background-size: 26px 26px;
    background-position: 0 0;
    min-height: 100dvh;
}

.page {
    position: relative;
    z-index: 1;
    max-width: 1080px;
    margin: 0 auto;
    padding: 30px 32px 40px;
}

/* ---- header ---- */
header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 14px; }
.logo { filter: drop-shadow(0 0 5px rgba(114, 125, 136, 0.25)); display: block; }

.home-link {
    display: inline-flex;
    line-height: 0;
    transition: transform 0.15s, filter 0.15s;
}
.home-link:hover { transform: translateX(-2px); }
.home-link:hover .logo { filter: drop-shadow(0 0 7px var(--accent)); }
.home-link:focus-visible { outline: 1px solid var(--accent); outline-offset: 3px; }

.back-link {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}
.back-link:hover,
.back-link:focus-visible {
    color: var(--ink);
    border-bottom-color: var(--accent);
    outline: none;
}

h1 {
    margin: 0;
    font-size: 26px;
    font-weight: 300;
    letter-spacing: 0.22em;
    color: var(--ink);
}

.sub {
    margin: 4px 0 0;
    font-size: 10px;
    letter-spacing: 0.28em;
    color: var(--sub);
}

.privacy {
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--body);
}
.lock { color: var(--accent); margin-right: 4px; }

.mono { font-family: var(--mono); }

/* ---- tabs ---- */
.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 20px 0 22px;
}

.tab {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--body);
    background: transparent;
    border: 1px solid var(--line);
    padding: 8px 13px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.tab:hover { background: var(--hi); }
.tab.active {
    color: #fff;
    background: var(--accent);
    border-color: var(--accent);
}

/* ---- panels ---- */
.panel { display: none; animation: fade 0.25s ease; }
.panel.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

h2 {
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.18em;
    color: var(--sub);
    margin: 0 0 16px;
    text-transform: uppercase;
}
.mk { color: var(--accent); margin-right: 6px; }

/* ---- controls ---- */
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 20px;
    margin-bottom: 12px;
}

label {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    color: var(--sub);
    flex: 1 1 200px;
    min-width: 160px;
}

input, select {
    font-family: var(--mono);
    font-size: 14px;
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--line);
    padding: 9px 11px;
    outline: none;
    width: 100%;
    transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(114, 125, 136, 0.14);
}

.err {
    min-height: 1em;
    margin: 4px 0 8px;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--magenta);
    letter-spacing: 0.04em;
}

/* ---- result ---- */
.result { margin-top: 8px; }

.rgrid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1px;
    background: var(--line-soft);
    border: 1px solid var(--line-soft);
}
.cell {
    background: var(--bg);
    padding: 11px 14px;
    display: flex;
    flex-direction: column;
    gap: 3px;
}
.cell.span { grid-column: 1 / -1; }
.k {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--sub);
    text-transform: uppercase;
}
.val {
    font-family: var(--mono);
    font-size: 15px;
    color: var(--ink);
    word-break: break-all;
    line-height: 1.4;
}
.val.big { font-size: 17px; letter-spacing: 0.02em; }
.val .bin { color: var(--body); font-size: 12px; }
.val .hl { color: var(--accent); }
.badge {
    display: inline-block;
    font-family: var(--mono);
    font-size: 11px;
    padding: 2px 8px;
    border: 1px solid var(--accent-dim);
    color: var(--accent);
    margin: 2px 4px 2px 0;
}
.badge.warn { color: var(--magenta); border-color: var(--magenta); }

/* ---- table ---- */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line-soft); }
table { border-collapse: collapse; width: 100%; font-family: var(--mono); font-size: 12.5px; }
th, td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid var(--line-soft);
    white-space: nowrap;
    color: var(--ink);
}
th {
    position: sticky;
    top: 0;
    background: var(--panel-bg);
    color: var(--sub);
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 10px;
}
tbody tr:hover { background: var(--hi); }
td.dim { color: var(--sub); }

.note {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--sub);
    margin-top: 10px;
    letter-spacing: 0.04em;
}

/* ---- subnet / wildcard visualization ---- */
.viz-h {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--sub);
    text-transform: uppercase;
    margin: 18px 0 8px;
}
.bits { display: flex; flex-wrap: wrap; gap: 10px; margin: 4px 0 6px; }
.octet { display: flex; gap: 2px; }
.bit {
    width: 22px; height: 26px;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--mono); font-size: 12px;
    border: 1px solid var(--line-soft);
    color: var(--body); background: #fff;
}
.bit.net  { background: var(--accent); color: #fff; border-color: var(--accent); }
.bit.host { background: var(--hi); }
.bit.care { background: var(--accent); color: #fff; border-color: var(--accent); }
.bit.dc   { background: repeating-linear-gradient(45deg, #fff, #fff 3px, var(--line-soft) 3px, var(--line-soft) 4px); }
.bit-legend { font-family: var(--mono); font-size: 11px; color: var(--sub); margin: 2px 0 4px; }
.bit-legend .sw { display: inline-block; width: 11px; height: 11px; vertical-align: -1px; margin: 0 3px 0 10px; border: 1px solid var(--line-soft); }
.bit-legend .sw.net { background: var(--accent); border-color: var(--accent); }
.bit-legend .sw.host { background: var(--hi); }

.blocks { display: flex; flex-wrap: wrap; gap: 4px; margin: 4px 0; }
.block {
    flex: 1 1 62px; min-width: 56px; text-align: center;
    padding: 8px 4px; border: 1px solid var(--line);
    font-family: var(--mono); font-size: 11px; color: var(--body);
    background: #fff;
}
.block.cur { background: var(--accent); color: #fff; border-color: var(--accent); }
.block small { display: block; font-size: 9px; color: inherit; opacity: 0.75; }

.rangebar {
    display: flex; height: 40px; margin: 6px 0 2px;
    border: 1px solid var(--line);
    font-family: var(--mono); font-size: 11px; overflow: hidden;
}
.rangebar .seg { display: flex; align-items: center; justify-content: center; white-space: nowrap; padding: 0 6px; overflow: hidden; }
.rangebar .s-net { background: var(--accent); color: #fff; flex: 0 0 auto; }
.rangebar .s-use { background: var(--hi); flex: 1 1 auto; color: var(--ink); }
.rangebar .s-bc  { background: var(--accent-dim); color: var(--ink); flex: 0 0 auto; }
.range-ends { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; color: var(--sub); }

/* ---- footer ---- */
footer {
    margin-top: 40px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
}
footer p { font-size: 11px; color: var(--sub); margin: 2px 0; letter-spacing: 0.04em; }
.tright { text-align: right; }

/* ---- HUD corners ---- */
.hud-corner {
    position: fixed;
    width: 20px; height: 20px;
    z-index: 3;
    pointer-events: none;
    border: 0 solid var(--accent-dim);
}
.hud-corner.tl { top: 12px; left: 12px; border-top-width: 1px; border-left-width: 1px; }
.hud-corner.tr { top: 12px; right: 12px; border-top-width: 1px; border-right-width: 1px; }
.hud-corner.bl { bottom: 12px; left: 12px; border-bottom-width: 1px; border-left-width: 1px; }
.hud-corner.br { bottom: 12px; right: 12px; border-bottom-width: 1px; border-right-width: 1px; }

/* ---- responsive ---- */
@media (max-width: 620px) {
    .page { padding: 22px 16px 30px; }
    header { flex-direction: column; align-items: flex-start; }
    h1 { font-size: 22px; }
    .privacy { font-size: 10px; }
    .tab { font-size: 11px; padding: 7px 10px; }
}