@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@300;400;500;600&display=swap');

:root {
  --bg:      #111214;
  --bg2:     #18191c;
  --bg3:     #1e2023;
  --border:  #2e3035;
  --border2: #3a3c42;
  --text:    #d4d6da;
  --text2:   #6b6f78;
  --text3:   #4a4e56;
  --accent:  #e0e2e6;
  --red:     #c0392b;
  --red-bg:  rgba(192,57,43,0.08);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  min-height: 100vh;
  line-height: 1.5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}

h1 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.header-sub {
  font-size: 11px;
  color: var(--text2);
  letter-spacing: 0.05em;
}

.panel {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 20px 22px;
  margin-bottom: 12px;
}

.panel-title {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--text2);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.field label {
  font-size: 10px;
  color: var(--text2);
  letter-spacing: 0.08em;
}

input, select {
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  padding: 7px 11px;
  outline: none;
  transition: border-color 0.15s;
  border-radius: 2px;
}

input:focus, select:focus { border-color: #555; }
input.error { border-color: var(--red); }
select option { background: var(--bg3); }

.btn {
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  padding: 7px 16px;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  white-space: nowrap;
  letter-spacing: 0.03em;
}

.btn:hover { border-color: #666; color: var(--accent); }

.btn-primary {
  background: #222428;
  border-color: #484c54;
  color: var(--accent);
}
.btn-primary:hover { background: #2a2d32; border-color: #666; }

.btn-danger { border-color: #4a2020; color: #c07070; }
.btn-danger:hover { background: var(--red-bg); border-color: var(--red); color: #d08080; }

.err-msg {
  font-size: 11px;
  color: var(--red);
  margin-top: 8px;
  min-height: 16px;
}

.stats-bar {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  margin-bottom: 20px;
  overflow: hidden;
}

.stat {
  padding: 10px 18px;
  border-right: 1px solid var(--border);
  flex: 1;
}
.stat:last-child { border-right: none; }

.stat-label {
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--text2);
  margin-bottom: 3px;
}

.stat-val {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab {
  padding: 9px 20px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.07em;
  color: var(--text2);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Tree ── */
#tree {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.subnet-node { animation: fadeIn 0.18s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.subnet-card {
  display: flex;
  align-items: center;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 2px solid var(--border2);
  transition: border-color 0.15s, background 0.15s;
}

.subnet-card:hover { border-color: var(--border2); background: var(--bg3); }

.depth-0 .subnet-card { border-left-color: #9ca3af; }
.depth-1 .subnet-card { border-left-color: #6b7280; }
.depth-2 .subnet-card { border-left-color: #52565e; }
.depth-3 .subnet-card { border-left-color: #3a3d44; }

.card-main {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  flex: 1;
  min-width: 0;
}

.cell {
  padding: 10px 14px;
  border-right: 1px solid var(--border);
  white-space: nowrap;
}

.cell-cidr {
  font-weight: 600;
  font-size: 13px;
  color: var(--accent);
  min-width: 160px;
}

.cell-label {
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--text3);
  margin-bottom: 2px;
}

.cell-val { font-size: 12px; color: var(--text); }

.cell-hosts { font-size: 11px; color: var(--text2); min-width: 110px; }

.card-actions {
  display: flex;
  gap: 6px;
  padding: 0 12px;
  flex-shrink: 0;
}

.split-form {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-top: none;
  flex-wrap: wrap;
  animation: fadeIn 0.15s ease;
}

.split-form label {
  font-size: 10px;
  color: var(--text2);
  letter-spacing: 0.07em;
}

.children {
  margin-left: 20px;
  border-left: 1px solid var(--border);
  padding-left: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 4px;
}

/* ── Exclude ── */
#excludeResult {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.excl-row {
  display: flex;
  align-items: center;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 2px solid var(--border2);
  animation: fadeIn 0.18s ease;
}

.excl-row.is-excluded {
  background: var(--red-bg);
  border-left-color: var(--red);
  opacity: 0.55;
}

.excl-badge {
  font-size: 10px;
  padding: 2px 7px;
  border: 1px solid #4a2020;
  color: #c07070;
  border-radius: 2px;
  margin-left: 8px;
  vertical-align: middle;
}

.empty-state {
  padding: 48px 20px;
  text-align: center;
  color: var(--text2);
  font-size: 12px;
  border: 1px dashed var(--border);
}

.section-label {
  font-size: 10px;
  color: var(--text2);
  letter-spacing: .1em;
  padding: 10px 4px 6px;
}