/* Subnet Workbench — modern technical aesthetic
   Type:  Inter Tight (UI)  +  JetBrains Mono (data)
   Tone:  warm-neutral dark with a single cyan accent
*/

:root {
  --accent: #6ee7e7;
  --accent-strong: #00d4d4;
  --accent-bg: rgba(110, 231, 231, 0.08);

  --bg: #0d0e10;
  --bg-1: #15171b;
  --bg-2: #1c1f24;
  --bg-3: #252930;
  --line: rgba(255, 255, 255, 0.07);
  --line-strong: rgba(255, 255, 255, 0.14);

  --fg: #e8e6e0;
  --fg-mute: #9b9a93;
  --fg-dim: #6b6a64;

  --good: #7dd47d;
  --warn: #f0c674;
  --bad: #e88a8a;

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;

  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: 'Inter Tight', ui-sans-serif, system-ui, -apple-system, sans-serif;

  --pad: 18px;
}

[data-theme="light"] {
  --bg: #e8e6df;
  --bg-1: #f1efe8;
  --bg-2: #ddd9ce;
  --bg-3: #cfcabd;
  --line: rgba(0, 0, 0, 0.10);
  --line-strong: rgba(0, 0, 0, 0.18);
  --fg: #1c1b18;
  --fg-mute: #545048;
  --fg-dim: #7a7669;
  --accent: #006d6d;
  --accent-strong: #004f4f;
  --accent-bg: rgba(0, 109, 109, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 14px;
  line-height: 1.5;
}

button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; color: inherit; }

::selection { background: var(--accent); color: var(--bg); }

/* ── Layout ── */
.app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto 1fr;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  display: block;
  color: var(--accent);
}
.brand sub {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-dim);
  font-weight: 500;
  padding-left: 8px;
  border-left: 1px solid var(--line-strong);
  margin-left: 4px;
  vertical-align: middle;
}

.tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-1);
  padding: 3px;
  border-radius: 8px;
  border: 1px solid var(--line);
}
.tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--fg-mute);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: color .12s, background .12s;
  white-space: nowrap;
}
.tab:hover { color: var(--fg); }
.tab[data-active="1"] {
  background: var(--bg-3);
  color: var(--fg);
}

.topbar-r { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-1);
  color: var(--fg-mute);
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover { color: var(--fg); border-color: var(--line-strong); }

.main {
  padding: 28px 24px 80px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* ── Common cards ── */
.card {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.card-h {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  gap: 12px;
}
.card-h h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.card-h .muted {
  font-size: 11px;
  color: var(--fg-dim);
  font-family: var(--mono);
  letter-spacing: 0.02em;
}
.card-body { padding: 18px; }

.page-h {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 0 0 18px;
  gap: 16px;
}
.page-h h1 {
  font-size: 22px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.02em;
}
.page-h p {
  margin: 0;
  color: var(--fg-mute);
  font-size: 13px;
}

/* ── Inputs ── */
.input-row {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color .12s;
}
.input-row:focus-within { border-color: var(--accent); }
.input-row input {
  flex: 1;
  border: 0;
  background: transparent;
  outline: none;
  padding: 9px 12px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg);
  min-width: 0;
}
.input-row input::placeholder { color: var(--fg-dim); }
.input-row .slash {
  color: var(--fg-dim);
  font-family: var(--mono);
  padding: 0 4px;
  user-select: none;
}
.input-row .prefix-input {
  flex: 0 0 140px;
  text-align: left;
}

.label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  font-weight: 600;
  margin-bottom: 6px;
  display: block;
}

.btn {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: var(--bg-2);
  color: var(--fg);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 500;
  transition: background .12s, border-color .12s;
  white-space: nowrap;
}
.btn:hover { background: var(--bg-3); border-color: var(--line-strong); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0d2828;
  font-weight: 600;
}
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn-ghost { background: transparent; border-color: var(--line); }
.btn-danger { color: var(--bad); }
.btn-sm { padding: 4px 8px; font-size: 11px; border-radius: 6px; }

.btn-group { display: flex; gap: 6px; flex-wrap: wrap; }

/* ── Mono data ── */
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.kbd, code {
  font-family: var(--mono);
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
}

/* ── Visual Subnet Table ── */
.vs-wrap { overflow-x: auto; }
.vs-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 12.5px;
}
.vs-table th {
  text-align: left;
  padding: 10px 12px;
  font-weight: 500;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  border-bottom: 1px solid var(--line);
  background: var(--bg-1);
  position: sticky;
  top: 0;
  font-family: var(--sans);
}
.vs-table td {
  padding: 0;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
  position: relative;
}
.vs-table tr:last-child td { border-bottom: 0; }
.vs-table tr:hover td { background: var(--bg-2); }
.vs-table tr.colored:hover td { filter: brightness(1.08); }

.vs-cell { padding: 9px 12px; }

.vs-subnet {
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}
.vs-prefix {
  color: var(--fg-dim);
  font-size: 11.5px;
}
.vs-range, .vs-mask, .vs-host { color: var(--fg-mute); font-size: 12px; }
.vs-hosts {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.vs-action {
  display: flex;
  gap: 4px;
  align-items: center;
  justify-content: flex-end;
  padding: 6px 12px;
}
.vs-act {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg-mute);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-family: var(--sans);
  font-weight: 500;
  transition: all .12s;
  white-space: nowrap;
}
.vs-act:hover { background: var(--accent); color: #0d2828; border-color: var(--accent); }
.vs-act:disabled { opacity: 0.25; cursor: not-allowed; }
.vs-act:disabled:hover { background: transparent; color: var(--fg-mute); border-color: var(--line); }

.vs-note {
  background: transparent;
  border: 0;
  outline: none;
  font-family: var(--mono);
  color: var(--fg);
  font-size: 12.5px;
  width: 100%;
  padding: 9px 12px;
  border-radius: 0;
}
.vs-note:focus { background: var(--bg-2); }
.vs-note::placeholder { color: var(--fg-dim); font-style: italic; }

.vs-color {
  display: flex;
  gap: 3px;
  padding: 6px 12px;
  align-items: center;
  flex-wrap: wrap;
}
.vs-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid rgba(0,0,0,0.2);
  cursor: pointer;
  position: relative;
}
.vs-swatch.active {
  outline: 2px solid var(--fg);
  outline-offset: 1px;
}
.vs-swatch.clear {
  background: transparent;
  border: 1px dashed var(--line-strong);
  color: var(--fg-dim);
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* row tinting */
tr.colored.tint-red    td { background: rgba(232,138,138,0.08) !important; }
tr.colored.tint-orange td { background: rgba(240,170,100,0.10) !important; }
tr.colored.tint-yellow td { background: rgba(240,198,116,0.11) !important; }
tr.colored.tint-green  td { background: rgba(125,212,125,0.09) !important; }
tr.colored.tint-cyan   td { background: rgba(110,231,231,0.10) !important; }
tr.colored.tint-blue   td { background: rgba(140,170,235,0.11) !important; }
tr.colored.tint-purple td { background: rgba(190,150,235,0.10) !important; }
tr.colored.tint-pink   td { background: rgba(235,150,200,0.10) !important; }
tr.colored.tint-gray   td { background: rgba(255,255,255,0.05) !important; }

/* ── Toolbar above table ── */
.vs-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-1);
  flex-wrap: wrap;
}
.vs-tb-l { display: flex; align-items: center; gap: 8px; flex: 1; flex-wrap: wrap; }
.vs-tb-r { display: flex; align-items: center; gap: 8px; }

.col-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 11px;
  color: var(--fg-mute);
  user-select: none;
}
.col-toggle input { margin: 0; }

/* ── Stats grid ── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px;
  background: var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
}
.stat {
  background: var(--bg-1);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-l {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  font-weight: 500;
}
.stat-v {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  word-break: break-all;
  font-variant-numeric: tabular-nums;
}
.stat-v.lg { font-size: 18px; }
.stat-v.dim { color: var(--fg-mute); }
.stat-v.accent { color: var(--accent); }
.stat-v.good { color: var(--good); }
.stat-v.bad { color: var(--bad); }

/* ── Binary view ── */
.binview {
  font-family: var(--mono);
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 4px 16px;
  font-size: 12px;
  align-items: center;
}
.binview .lab { color: var(--fg-dim); font-size: 11px; }
.binview .val { word-break: break-all; }
.binview .net  { color: var(--accent); }
.binview .host { color: var(--fg-mute); }
.binview .mask-1 { color: var(--accent); }
.binview .mask-0 { color: var(--fg-dim); }

/* ── Inline form rows ── */
.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.form-cell { display: flex; flex-direction: column; }

/* ── Result blocks ── */
.result-block {
  background: var(--bg-2);
  border-radius: var(--r-md);
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 12.5px;
  white-space: pre-wrap;
  color: var(--fg);
  line-height: 1.7;
  word-break: break-all;
}
.result-block .accent { color: var(--accent); }
.result-block .dim { color: var(--fg-mute); }

.empty-hint {
  color: var(--fg-dim);
  font-size: 12.5px;
  font-style: italic;
  padding: 18px;
  text-align: center;
}

/* ── VLSM table ── */
.vlsm-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 12.5px;
}
.vlsm-table th, .vlsm-table td {
  padding: 9px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
.vlsm-table th {
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  background: var(--bg-1);
}
.vlsm-table td.num { text-align: right; }
.vlsm-row {
  display: grid;
  grid-template-columns: 1fr 100px 36px;
  gap: 8px;
  align-items: center;
  margin-bottom: 6px;
}
.vlsm-row input {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 12.5px;
  outline: none;
}
.vlsm-row input:focus { border-color: var(--accent); }
.vlsm-row .num-input { font-family: var(--mono); text-align: right; }

/* ── Pill / badge ── */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  font-size: 11px;
  color: var(--fg-mute);
  font-family: var(--mono);
  letter-spacing: 0.01em;
}
.pill.good   { color: var(--good); border-color: rgba(125,212,125,0.3); background: rgba(125,212,125,0.06); }
.pill.warn   { color: var(--warn); border-color: rgba(240,198,116,0.3); background: rgba(240,198,116,0.06); }
.pill.bad    { color: var(--bad);  border-color: rgba(232,138,138,0.3); background: rgba(232,138,138,0.06); }
.pill.accent { color: var(--accent); border-color: rgba(110,231,231,0.3); background: var(--accent-bg); }

/* ── Section gap ── */
.stack > * + * { margin-top: 18px; }

/* footer */
.foot {
  text-align: center;
  color: var(--fg-dim);
  font-size: 11px;
  padding: 24px;
  font-family: var(--mono);
  letter-spacing: 0.02em;
}
.foot a { color: var(--fg-mute); text-decoration: none; }
.foot a:hover { color: var(--accent); }

/* density */
[data-density="compact"] .vs-cell,
[data-density="compact"] .vs-note,
[data-density="compact"] .vs-color,
[data-density="compact"] .vs-action { padding-top: 5px; padding-bottom: 5px; }
[data-density="comfy"] .vs-cell,
[data-density="comfy"] .vs-note,
[data-density="comfy"] .vs-color,
[data-density="comfy"] .vs-action { padding-top: 13px; padding-bottom: 13px; }

/* responsiveness */
@media (max-width: 720px) {
  .topbar { flex-direction: column; align-items: stretch; }
  .tabs { overflow-x: auto; }
  .main { padding: 16px 12px 60px; }
}

/* ── Visual: multi-network + detach ── */
.net-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 22px;
  padding: 0 7px;
  border-radius: 5px;
  background: var(--accent-bg);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
tr.detached td {
  opacity: 0.45;
  text-decoration: line-through;
  text-decoration-color: var(--fg-dim);
}
tr.detached .vs-tag,
tr.detached .vs-act { text-decoration: none; opacity: 1; }

/* divider between network blocks */
.net-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 2px;
  color: var(--fg-dim);
}
.net-divider::before,
.net-divider::after {
  content: "";
  flex: 1;
  border-top: 1px dashed var(--line-strong);
}
.net-divider span {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

/* icon-style action buttons (separate / reattach) */
.vs-act-icon {
  font-size: 14px;
  line-height: 1;
  padding: 3px 7px;
  font-family: var(--mono);
}
.vs-act.active {
  background: var(--accent);
  color: #0d2828;
  border-color: var(--accent);
}

/* in-table section divider (visual grouping within one network) */
.vs-divider-row td {
  padding: 0 !important;
  background: var(--bg-2);
  border-bottom: 1px solid var(--line);
}
.vs-section {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 12px;
}
.vs-section-mark {
  width: 4px;
  align-self: stretch;
  min-height: 16px;
  border-radius: 2px;
  background: var(--accent);
  flex-shrink: 0;
}
.vs-section-input {
  flex: 1;
  background: transparent;
  border: 0;
  outline: none;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 2px 0;
}
.vs-section-input::placeholder {
  color: var(--fg-dim);
  font-weight: 500;
  text-transform: none;
  letter-spacing: normal;
  font-style: italic;
}
.vs-section-x {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--fg-dim);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 2px 6px;
  border-radius: 4px;
}
.vs-section-x:hover { color: var(--bad); background: var(--bg-3); }

/* hover-to-insert section divider (appears in the gap between subnet rows) */
.vs-insert-row td {
  padding: 0 !important;
  border: 0;
}
.vs-insert {
  appearance: none;
  border: 0;
  background: transparent;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  height: 14px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.12s ease;
}
.vs-insert:hover,
.vs-insert:focus-visible {
  opacity: 1;
  outline: none;
}
.vs-insert-line {
  flex: 1;
  height: 0;
  border-top: 1px dashed var(--accent);
}
.vs-insert-chip {
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-bg);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 1px 9px;
  white-space: nowrap;
}
.vs-tag {
  display: inline-flex;
  align-items: center;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--accent-bg);
  color: var(--accent);
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-left: 8px;
  text-decoration: none;
}

/* ── Summary tool ── */
.ta-mono {
  width: 100%;
  min-height: 160px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  padding: 12px 14px;
  background: var(--bg-2);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  resize: vertical;
  transition: border-color .12s;
}
.ta-mono:focus { border-color: var(--accent); }
.example-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.hero-cidr {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  padding: 18px 20px;
  background: var(--accent-bg);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.hero-cidr-main {
  font-family: var(--mono);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--accent);
}
.hero-cidr-sub { display: flex; gap: 8px; align-items: center; }

.snippet {
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--bg-2);
}
.snippet:last-child { margin-bottom: 0; }
.snippet-h {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--bg-1);
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  color: var(--fg-mute);
  font-weight: 500;
}
.snippet-body {
  margin: 0;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--fg);
  white-space: pre;
  overflow-x: auto;
}

/* segmented control */
.seg {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-2);
}
.seg-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--fg-mute);
  padding: 5px 11px;
  font-size: 11px;
  font-family: var(--mono);
  font-weight: 500;
  cursor: pointer;
  transition: all .12s;
}
.seg-btn:hover { color: var(--fg); }
.seg-btn.active {
  background: var(--accent);
  color: #0d2828;
}

.pill.warn {
  background: rgba(240,198,116,0.14);
  color: #f0c674;
  border-color: rgba(240,198,116,0.3);
}
[data-theme="light"] .pill.warn { color: #946800; background: rgba(240,170,0,0.14); border-color: rgba(240,170,0,0.35); }
[data-theme="light"] .seg-btn.active { color: #fff; }