.page { padding: 40px 20px; max-width: 1100px; margin: 0 auto; }
.page h1 { font-size: 26px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.page .subtitle { color: #888; margin-bottom: 24px; font-size: 14px; }

label {
  display: block; font-size: 12px; font-weight: 600; color: #aaa;
  margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.5px;
}

.card {
  background: #141414; border: 1px solid #262626;
  border-radius: 12px; padding: 24px; margin-bottom: 20px;
}

.sec-title { color: #fff; font-size: 16px; margin-bottom: 14px; }

.inp-row { margin-bottom: 16px; }
.inp-row.two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 0; }
.inp-group.big input { font-size: 18px; padding: 14px 16px; letter-spacing: 0.5px; }

input[type="text"], input[type="number"] {
  width: 100%; background: #0d0d0d; border: 1px solid #2a2a2a; border-radius: 8px;
  color: #e1e1e1; padding: 10px 12px; font-size: 14px;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace; outline: none;
  transition: border-color 0.15s;
}
input[type="text"]:focus, input[type="number"]:focus { border-color: #ff4444; }
input.invalid { border-color: #ff4444; }

input[type="range"] {
  width: 100%; -webkit-appearance: none; appearance: none; height: 4px;
  background: #2a2a2a; border-radius: 2px; outline: none; margin: 10px 0;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 18px; height: 18px;
  border-radius: 50%; background: #ff4444; cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%; background: #ff4444;
  cursor: pointer; border: none;
}
.prefix-val { color: #ff4444; font-family: 'SF Mono', Monaco, monospace; }

.err {
  color: #ff4444; font-size: 13px; margin-top: 6px;
  min-height: 18px;
}

.results-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
  margin-bottom: 20px;
}
.stat-card {
  background: #141414; border: 1px solid #262626; border-radius: 10px;
  padding: 14px 16px; cursor: pointer; transition: all 0.15s;
}
.stat-card:hover { border-color: #ff4444; }
.stat-card.copied { border-color: #4ade80; }
.stat-label {
  color: #888; font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.5px; margin-bottom: 6px;
}
.stat-val {
  color: #fff; font-weight: 600; font-size: 15px;
  font-family: 'SF Mono', Monaco, monospace;
  word-break: break-all;
}
.stat-val.accent { color: #ff4444; }

.bin-card { }
.bin-row { display: flex; flex-wrap: wrap; gap: 0; justify-content: flex-start; font-family: 'SF Mono', Monaco, monospace; font-size: 14px; }
.bin-octet { display: inline-flex; }
.bin-sep { color: #555; padding: 0 6px; font-weight: 700; align-self: center; }
.bit { padding: 4px 3px; color: #555; }
.bit.net { color: #ff4444; font-weight: 700; }
.bit.host { color: #666; }

.bin-legend {
  display: flex; gap: 20px; margin-top: 14px; font-size: 12px; color: #888;
}
.bin-legend .dot-net, .bin-legend .dot-host {
  display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: middle;
}
.bin-legend .dot-net { background: #ff4444; }
.bin-legend .dot-host { background: #555; }

.split-card { }
.split-row { margin-bottom: 14px; }
.split-meta { color: #888; font-size: 13px; margin-top: 6px; font-family: 'SF Mono', Monaco, monospace; }
.split-list {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px; max-height: 400px; overflow-y: auto;
}
.split-item {
  background: #0d0d0d; border: 1px solid #222; border-radius: 6px;
  padding: 8px 12px; font-family: 'SF Mono', Monaco, monospace;
  font-size: 13px; color: #ccc; cursor: pointer; transition: all 0.15s;
}
.split-item:hover { border-color: #ff4444; color: #fff; }
.split-item .range { color: #666; font-size: 11px; margin-top: 2px; }
.split-item.copied { border-color: #4ade80; }

.info-card {
  padding: 14px 18px; background: #0d0d0d; border: 1px solid #1f1f1f;
  border-radius: 10px; color: #888; font-size: 13px;
}

.class-badge, .type-badge {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.5px;
  text-transform: uppercase; margin-left: 6px; vertical-align: middle;
}
.class-A { background: rgba(102,170,255,0.15); color: #66aaff; }
.class-B { background: rgba(74,222,128,0.15); color: #4ade80; }
.class-C { background: rgba(251,191,36,0.15); color: #fbbf24; }
.class-D, .class-E { background: rgba(255,68,68,0.15); color: #ff4444; }

@media (max-width: 800px) {
  .results-grid { grid-template-columns: 1fr 1fr; }
  .inp-row.two { grid-template-columns: 1fr; }
  .bin-row { font-size: 12px; }
}
@media (max-width: 500px) {
  .results-grid { grid-template-columns: 1fr; }
  .bit { padding: 4px 2px; }
  .bin-sep { padding: 0 3px; }
}