@font-face { font-family: "Inter"; font-weight: 400 700; font-display: swap;
  src: url("fonts/Inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD; }
@font-face { font-family: "Inter"; font-weight: 400 700; font-display: swap;
  src: url("fonts/Inter-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF; }
@font-face { font-family: "Space Grotesk"; font-weight: 400 700; font-display: swap;
  src: url("fonts/SpaceGrotesk-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD; }
@font-face { font-family: "Space Grotesk"; font-weight: 400 700; font-display: swap;
  src: url("fonts/SpaceGrotesk-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF; }

:root {
  --void: #07040D; --deep: #0D0718; --raise: #150D26; --raise-2: #1C1233;
  --edge: #271741; --edge-soft: #1E1235; --edge-hot: #7C4DFF;
  --neon: #A97BFF; --cyan: #4FE9E0;
  --text: #F2ECFF; --dim: #ADA0D4; --faint: #7E729F;
  --danger: #FF7A8A; --danger-bg: rgba(255,122,138,.12);
  --ok: #4FE9E0;
  --net-bit: rgba(169,123,255,.20); --net-bit-edge: rgba(169,123,255,.55);
  --host-bit: rgba(79,233,224,.10); --host-bit-edge: rgba(79,233,224,.35);
  --ease: cubic-bezier(.16,1,.3,1);
  --fast: .15s var(--ease); --med: .2s var(--ease);
  --radius: 12px;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Menlo", "Consolas", monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0; min-height: 100dvh;
  background: var(--void); color: var(--text);
  font: 400 15px/1.55 "Inter", ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  caret-color: var(--neon);
}
::selection { background: rgba(124,77,255,.55); color: #fff; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--neon); outline-offset: 3px; border-radius: 8px; }
h1, h2, h3 { font-family: "Space Grotesk", sans-serif; margin: 0; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
button { font: inherit; color: inherit; }

/* scrollbars follow the palette instead of the browser default */
.table-wrap, .vlsm-table-wrap, .bitgrid-scroll {
  scrollbar-width: thin; scrollbar-color: var(--edge) transparent;
}
.table-wrap::-webkit-scrollbar, .vlsm-table-wrap::-webkit-scrollbar, .bitgrid-scroll::-webkit-scrollbar { height: 8px; width: 8px; }
.table-wrap::-webkit-scrollbar-track, .vlsm-table-wrap::-webkit-scrollbar-track, .bitgrid-scroll::-webkit-scrollbar-track { background: transparent; }
.table-wrap::-webkit-scrollbar-thumb, .vlsm-table-wrap::-webkit-scrollbar-thumb, .bitgrid-scroll::-webkit-scrollbar-thumb { background: var(--edge); border-radius: 8px; }
.table-wrap::-webkit-scrollbar-thumb:hover, .vlsm-table-wrap::-webkit-scrollbar-thumb:hover, .bitgrid-scroll::-webkit-scrollbar-thumb:hover { background: var(--edge-hot); }

@keyframes settle {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--raise-2); color: var(--text); padding: 10px 16px; border-radius: 0 0 10px 0;
}
.skip:focus { left: 0; }

/* aurora, same light source as the rest of the domain */
body::before {
  content: ""; position: fixed; inset: -30vh -20vw auto -20vw; height: 70vh;
  background:
    radial-gradient(50% 60% at 20% 0%, rgba(109,40,217,.24), transparent 70%),
    radial-gradient(40% 50% at 80% 4%, rgba(79,233,224,.06), transparent 70%);
  pointer-events: none; z-index: 0;
}

/* ---------- header ---------- */
.top {
  position: relative; z-index: 1;
  max-width: 1120px; margin: 0 auto; padding: 22px 20px 0;
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 20px;
}
.back {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 13px; color: var(--faint); text-decoration: none;
  padding: 6px 4px; border-radius: 8px; transition: color var(--fast);
}
.back:hover, .back:focus-visible { color: var(--dim); }
.top-title { flex: 1 1 260px; }
.marca {
  font-family: "Space Grotesk", sans-serif; font-weight: 600; font-size: 21px; letter-spacing: -.01em;
  display: inline-flex; align-items: center; gap: 9px;
}
.marca .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--neon); box-shadow: 0 1px 10px 1px rgba(124,77,255,.75);
}
.sub { margin: 4px 0 0; color: var(--faint); font-size: 13px; max-width: 60ch; }

/* ---------- tabs ---------- */
.tabs {
  position: relative; z-index: 1;
  max-width: 1120px; margin: 18px auto 0; padding: 0 20px;
  display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none;
  border-bottom: 1px solid var(--edge-soft);
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  display: inline-flex; align-items: center; gap: 8px; white-space: nowrap;
  background: transparent; border: none; cursor: pointer;
  padding: 11px 14px 13px; margin-bottom: -1px;
  color: var(--faint); font-size: 14px; font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: color var(--fast), border-color var(--fast);
  min-height: 44px;
}
.tab svg { flex: none; opacity: .85; transition: color var(--fast), opacity var(--fast); }
.tab:hover { color: var(--dim); }
.tab:hover svg { opacity: 1; }
.tab[aria-selected="true"] { color: var(--text); border-bottom-color: var(--edge-hot); }
.tab[aria-selected="true"] svg { color: var(--neon); opacity: 1; }

/* ---------- layout ---------- */
main { position: relative; z-index: 1; max-width: 1120px; margin: 0 auto; padding: 28px 20px 60px; }
.layout { display: grid; grid-template-columns: minmax(280px, 340px) 1fr; gap: 22px; align-items: start; }
@media (max-width: 860px) { .layout { grid-template-columns: 1fr; } }

.form-card {
  background: var(--deep); border: 1px solid var(--edge-soft); border-radius: var(--radius);
  padding: 20px; display: grid; gap: 18px; position: sticky; top: 16px;
}
@media (max-width: 860px) { .form-card { position: static; } }
.form-card h2 { font-size: 15px; font-weight: 600; display: flex; align-items: center; gap: 9px; }
.form-card h2::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%; flex: none;
  background: var(--neon); box-shadow: 0 1px 8px 0 rgba(124,77,255,.7);
}

.field { display: grid; gap: 7px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field-narrow { max-width: 110px; }
.field-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.field-alt { display: grid; gap: 7px; margin-top: 2px; }

label { font-size: 12.5px; color: var(--dim); letter-spacing: .01em; }
.field-value { font-family: var(--mono); font-size: 13px; color: var(--neon); font-weight: 600; }

input[type="text"], input[type="number"], textarea {
  background: var(--void); color: var(--text);
  border: 1px solid var(--edge); border-radius: 9px;
  padding: 10px 12px; font-size: 14.5px; width: 100%;
  transition: border-color var(--fast), box-shadow var(--fast);
  min-height: 44px;
}
textarea { min-height: 44px; resize: vertical; line-height: 1.6; }
input[type="text"]:hover, input[type="number"]:hover, textarea:hover { border-color: var(--faint); }
input[type="text"]:focus, input[type="number"]:focus, textarea:focus {
  outline: none; border-color: var(--edge-hot); box-shadow: 0 0 0 3px rgba(124,77,255,.18);
}
input[aria-invalid="true"] { border-color: var(--danger); }
input[aria-invalid="true"]:focus { box-shadow: 0 0 0 3px rgba(255,122,138,.16); }

.cidr-input { display: flex; align-items: center; gap: 4px; border: 1px solid var(--edge); border-radius: 9px; background: var(--void); padding: 0 4px 0 12px; }
.cidr-input span { color: var(--faint); font-family: var(--mono); }
.cidr-input input { border: none; background: transparent; min-height: 42px; padding-left: 2px; }
.cidr-input:focus-within { border-color: var(--edge-hot); box-shadow: 0 0 0 3px rgba(124,77,255,.18); }

input[type="range"] {
  width: 100%; height: 32px; appearance: none; background: transparent; cursor: pointer; margin: 0;
}
input[type="range"]::-webkit-slider-runnable-track { height: 5px; border-radius: 3px; background: var(--edge); }
input[type="range"]::-moz-range-track { height: 5px; border-radius: 3px; background: var(--edge); }
input[type="range"]::-webkit-slider-thumb {
  appearance: none; width: 20px; height: 20px; margin-top: -7.5px; border-radius: 50%;
  background: var(--neon); border: 3px solid var(--void); box-shadow: 0 0 0 1px var(--edge-hot);
  transition: transform var(--fast);
}
input[type="range"]:hover::-webkit-slider-thumb { transform: scale(1.08); }
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%; background: var(--neon); border: 3px solid var(--void); box-shadow: 0 0 0 1px var(--edge-hot);
}

.field-error {
  margin: 0; font-size: 12.5px; color: var(--danger);
  display: flex; align-items: center; gap: 6px;
}
.field-error::before { content: "⚠"; font-size: 11px; }

.hint { margin: 0; font-size: 12.5px; color: var(--faint); line-height: 1.6; }
.hint .mono { color: var(--dim); }

.btn-ghost {
  display: inline-flex; align-items: center; gap: 7px; justify-self: start;
  background: var(--raise); border: 1px solid var(--edge); border-radius: 9px;
  color: var(--dim); font-size: 13px; font-weight: 500; padding: 9px 14px; cursor: pointer; min-height: 40px;
  transition: border-color var(--fast), color var(--fast), background var(--fast), transform var(--fast);
}
.btn-ghost svg { color: var(--neon); }
.btn-ghost:hover, .btn-ghost:focus-visible { color: var(--text); border-color: var(--edge-hot); background: var(--raise-2); }
.btn-ghost:active { transform: scale(.97); }

/* ---------- results ---------- */
.results { display: grid; gap: 18px; min-width: 0; }
.card {
  background: var(--deep); border: 1px solid var(--edge-soft); border-radius: var(--radius);
  padding: 18px 20px;
  animation: settle .3s var(--ease) both;
}
.card h3 {
  font-size: 12.5px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.card h3::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%; flex: none;
  background: var(--edge-hot);
}
.empty {
  color: var(--faint); font-size: 13.5px; padding: 36px 8px; text-align: center;
  border: 1px dashed var(--edge-soft); border-radius: var(--radius);
  animation: settle .3s var(--ease) both;
}

/* stat list */
.stat-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px 20px; }
.stat { display: grid; gap: 3px; min-width: 0; }
.stat dt { font-size: 12px; color: var(--faint); }
.stat dd { margin: 0; font-family: var(--mono); font-size: 15.5px; color: var(--text); word-break: break-word; display: flex; align-items: center; gap: 7px; }
.stat dd.accent { color: var(--neon); }
.stat dd.cyan { color: var(--cyan); }

.copy-btn {
  background: transparent; border: none; color: var(--faint); cursor: pointer;
  padding: 5px; border-radius: 6px; display: inline-flex; flex: none;
  transition: color var(--fast), background var(--fast), transform var(--fast);
}
.copy-btn:hover, .copy-btn:focus-visible { color: var(--neon); background: var(--raise-2); }
.copy-btn:active { transform: scale(.88); }

.tag {
  display: inline-flex; align-items: center; font-size: 11.5px; letter-spacing: .03em;
  padding: 3px 9px; border-radius: 999px; border: 1px solid var(--edge-soft); background: var(--void); color: var(--dim);
}
.tag.neon { border-color: rgba(169,123,255,.4); color: var(--neon); }
.tag.cyan { border-color: rgba(79,233,224,.35); color: var(--cyan); }
.tag.danger { border-color: rgba(255,122,138,.35); color: var(--danger); }

/* ---------- bit grid ---------- */
/* scroll-edge hint: a faint shadow pinned to each true edge (attachment:
   scroll), masked by an opaque cover tied to the content edge (attachment:
   local) — the cover only uncovers the shadow once you've scrolled past it. */
.bitgrid-scroll {
  overflow-x: auto; padding-bottom: 4px;
  background:
    linear-gradient(to right, var(--deep) 40%, transparent) 0 0,
    linear-gradient(to left, var(--deep) 40%, transparent) 100% 0,
    linear-gradient(to right, rgba(0,0,0,.4), transparent) 0 0,
    linear-gradient(to left, rgba(0,0,0,.4), transparent) 100% 0;
  background-repeat: no-repeat; background-color: var(--deep);
  background-size: 28px 100%, 28px 100%, 12px 100%, 12px 100%;
  background-attachment: local, local, scroll, scroll;
}
.bitgrid { display: grid; gap: 6px; min-width: max-content; }
.bitrow { display: grid; grid-template-columns: 92px auto 128px; align-items: center; gap: 14px; }
.bitrow .rowlabel { font-size: 12px; color: var(--dim); white-space: nowrap; }
.bitrow .rowlabel .op { color: var(--faint); font-size: 11px; display: block; }
.bitrow .rowdec { font-family: var(--mono); font-size: 12.5px; color: var(--faint); text-align: right; white-space: nowrap; }
.bitrow.accent .rowdec { color: var(--neon); }
.bitrow.cyan .rowdec { color: var(--cyan); }

.octets { display: flex; gap: 10px; }
.octet { display: flex; gap: 3px; padding: 2px; border-radius: 6px; }
.bit {
  width: 26px; height: 32px; display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 12.5px; border-radius: 4px;
  background: var(--void); color: var(--faint); border: 1px solid transparent;
  margin: 0; padding: 0; cursor: help;
  transition: background var(--fast), border-color var(--fast), transform var(--fast);
}
.bit.net { background: var(--net-bit); color: var(--neon); border-color: var(--net-bit-edge); }
.bit.host { background: var(--host-bit); color: var(--cyan); border-color: var(--host-bit-edge); }
.bit.dim { opacity: .55; }
.bit.match { background: var(--net-bit); color: var(--neon); border-color: var(--net-bit-edge); }
.bit.diff { background: var(--host-bit); color: var(--faint); border-color: var(--host-bit-edge); }
span.bit:hover, span.bit:focus-visible { outline: none; box-shadow: 0 0 0 2px var(--edge-soft); }

/* only the IP and mask rows are real inputs — give them a visible,
   generous tap target and a distinct pressed/hover affordance. */
button.bit.editable {
  width: 30px; height: 38px; cursor: pointer; font-weight: 600;
}
button.bit.editable:hover { border-color: var(--edge-hot); }
button.bit.editable:focus-visible { outline: none; box-shadow: 0 0 0 2px var(--edge-hot); }
button.bit.editable:active { transform: scale(.92); }

.bitgrid-legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 12px; font-size: 12px; color: var(--faint); }
.bitgrid-legend span { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 12px; height: 12px; border-radius: 3px; border: 1px solid transparent; }
.swatch.net { background: var(--net-bit); border-color: var(--net-bit-edge); }
.swatch.host { background: var(--host-bit); border-color: var(--host-bit-edge); }

/* ---------- VLSM ---------- */
.vlsm-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.vlsm-row { display: grid; grid-template-columns: 1fr 96px 40px; gap: 8px; align-items: center; }
.vlsm-row input { min-height: 40px; padding: 8px 10px; font-size: 13.5px; }
.vlsm-remove {
  background: transparent; border: 1px solid var(--edge); border-radius: 8px; color: var(--faint);
  width: 40px; height: 40px; display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
  transition: color var(--fast), border-color var(--fast);
}
.vlsm-remove:hover, .vlsm-remove:focus-visible { color: var(--danger); border-color: var(--danger); }

.vlsm-table-wrap {
  overflow-x: auto;
  background:
    linear-gradient(to right, var(--deep) 40%, transparent) 0 0,
    linear-gradient(to left, var(--deep) 40%, transparent) 100% 0,
    linear-gradient(to right, rgba(0,0,0,.4), transparent) 0 0,
    linear-gradient(to left, rgba(0,0,0,.4), transparent) 100% 0;
  background-repeat: no-repeat; background-color: var(--deep);
  background-size: 28px 100%, 28px 100%, 12px 100%, 12px 100%;
  background-attachment: local, local, scroll, scroll;
}
table.vlsm-table { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 760px; }
table.vlsm-table th, table.vlsm-table td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--edge-soft); white-space: nowrap; }
table.vlsm-table th { color: var(--faint); font-weight: 500; font-size: 11.5px; text-transform: uppercase; letter-spacing: .03em; }
table.vlsm-table td.mono { color: var(--dim); }
table.vlsm-table tr:last-child td { border-bottom: none; }
table.vlsm-table td.name { color: var(--text); font-weight: 500; white-space: normal; }

.space-bar { display: flex; height: 30px; border-radius: 8px; overflow: hidden; border: 1px solid var(--edge-soft); margin-top: 4px; }
.space-seg { display: flex; align-items: center; justify-content: center; font-size: 11px; color: var(--void); font-weight: 600; min-width: 2px; }
.space-seg.free { background: var(--raise-2); color: var(--faint); font-weight: 400; }

/* ---------- conversor ---------- */
.conv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: start; }
@media (max-width: 980px) { .conv-grid { grid-template-columns: 1fr; } }

.table-wrap {
  max-height: 320px; overflow-y: auto; border: 1px solid var(--edge-soft); border-radius: 9px; padding: 4px;
  /* only a bottom fade: the sticky header already covers the top edge */
  background:
    linear-gradient(to top, var(--deep) 40%, transparent) 0 100%,
    linear-gradient(to top, rgba(0,0,0,.4), transparent) 0 100%;
  background-repeat: no-repeat; background-color: var(--deep);
  background-size: 100% 24px, 100% 10px;
  background-attachment: local, scroll;
}
table.mask-table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
table.mask-table th, table.mask-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--edge-soft); font-family: var(--mono); white-space: nowrap; }
table.mask-table th { color: var(--faint); position: sticky; top: 0; background: var(--deep); font-family: "Inter", sans-serif; text-transform: uppercase; font-size: 11px; letter-spacing: .03em; }
table.mask-table tr:last-child td { border-bottom: none; }
table.mask-table tbody tr { cursor: pointer; transition: background var(--fast); }
table.mask-table tbody tr:hover, table.mask-table tbody tr:focus-within { background: var(--raise); }
table.mask-table tbody tr:active { background: var(--raise-2); }
table.mask-table tbody tr.active { background: var(--raise-2); }
table.mask-table tbody tr.active td:first-child { color: var(--neon); }

.bit-builder { display: flex; gap: 6px; flex-wrap: wrap; }
.bit-toggle {
  min-width: 46px; min-height: 50px; border-radius: 9px; border: 1px solid var(--edge);
  background: var(--void); color: var(--dim); font-family: var(--mono); font-size: 13px;
  display: grid; place-items: center; gap: 3px; cursor: pointer; padding: 4px;
  transition: background var(--fast), border-color var(--fast), color var(--fast), transform var(--fast);
}
.bit-toggle span { font-size: 11px; color: var(--faint); }
.bit-toggle[aria-pressed="true"] { background: var(--net-bit); border-color: var(--net-bit-edge); color: var(--neon); }
.bit-toggle[aria-pressed="true"] span { color: var(--neon); opacity: .8; }
.bit-toggle:hover { border-color: var(--edge-hot); }
.bit-toggle:active { transform: scale(.94); }
.bit-builder-value {
  display: block; margin-top: 14px; font-family: var(--mono); font-size: 30px; font-weight: 600;
  color: var(--text);
  transition: color var(--fast);
}
.bit-builder-value::before { content: "= "; color: var(--faint); font-weight: 400; font-size: 20px; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 22px; transform: translate(-50%, 12px);
  background: var(--raise-2); border: 1px solid var(--edge-hot); color: var(--text);
  padding: 10px 16px; border-radius: 9px; font-size: 13px; z-index: 50;
  opacity: 0; pointer-events: none; transition: opacity var(--med), transform var(--med);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- footer ---------- */
.foot { position: relative; z-index: 1; text-align: center; padding: 10px 20px 40px; font-size: 12px; color: var(--faint); }
.foot .sep { color: var(--edge); margin: 0 8px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 1ms !important; animation-duration: 1ms !important; }
}

@media (pointer: coarse) {
  .copy-btn { padding: 8px; }
}