.page { padding: 40px 20px; max-width: 1000px; margin: 0 auto; }
.page h1 { font-size: 26px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.page .subtitle { color: #888; margin-bottom: 20px; font-size: 14px; }

.presets {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  margin-bottom: 20px;
}
.preset-label { color: #888; font-size: 12px; font-family: 'SF Mono', Monaco, monospace; }
.preset {
  padding: 6px 12px; background: #141414; border: 1px solid #2a2a2a;
  color: #ccc; border-radius: 6px; font-size: 12px; cursor: pointer;
  font-family: 'SF Mono', Monaco, monospace; transition: all 0.15s;
}
.preset:hover { border-color: #ff4444; color: #fff; }

.fields {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  margin-bottom: 20px;
}
.field label {
  display: block; color: #aaa; font-size: 12px;
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px;
}
.field input {
  width: 100%; background: #0d0d0d; border: 1px solid #2a2a2a;
  color: #fff; border-radius: 8px; padding: 12px 14px;
  font-family: 'SF Mono', Monaco, monospace; font-size: 14px;
  outline: none; transition: border-color 0.15s;
}
.field input:focus { border-color: #ff4444; }
.field.error input { border-color: #f87171; }
.err { color: #f87171; font-size: 12px; margin-top: 4px; min-height: 16px; font-family: 'SF Mono', Monaco, monospace; }

.card {
  background: #141414; border: 1px solid #262626; border-radius: 12px;
  padding: 18px; margin-bottom: 16px;
}
.card h3 { color: #fff; font-size: 14px; margin: 0; }
.card-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 12px;
}
.hint { color: #666; font-size: 12px; }

.bits {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
  font-family: 'SF Mono', Monaco, monospace;
}
.bit-group {
  display: flex; flex-wrap: wrap; gap: 2px;
  padding: 10px; background: #0a0a0a; border: 1px solid #1f1f1f; border-radius: 8px;
}
.bit {
  width: 20px; height: 26px; display: flex; align-items: center; justify-content: center;
  background: #151515; border: 1px solid #262626; border-radius: 3px;
  color: #555; font-size: 12px; cursor: pointer; transition: all 0.1s;
}
.bit:hover { border-color: #ff4444; color: #fff; }
.bit.on { background: #ff4444; color: #fff; border-color: #ff4444; }

.ascii {
  font-family: 'SF Mono', Monaco, monospace; color: #fff;
  font-size: 20px; margin-top: 10px;
}
.ascii .meta { color: #888; font-size: 13px; margin-left: 10px; }

.ref-table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.ref-table th, .ref-table td {
  text-align: left; padding: 8px 10px; border-bottom: 1px solid #1f1f1f;
  font-family: 'SF Mono', Monaco, monospace; font-size: 13px;
}
.ref-table th { color: #888; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; font-size: 11px; }
.ref-table td { color: #ddd; }

@media (max-width: 800px) {
  .fields { grid-template-columns: 1fr; }
  .bits { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
  .bits { grid-template-columns: 1fr; }
}