/* Subnet 계산기 전용 스타일 */

nav { max-width: 820px; }
main { max-width: 820px; }

.subtitle {
  color: var(--text-sub);
  margin-bottom: 1.25rem;
}

/* CIDR 입력 */
.cidr-input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.cidr-input label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-sub);
}

.cidr-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

#cidr {
  flex: 1;
  min-width: 200px;
  padding: 0.65rem 0.85rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.15rem;
  font-weight: 700;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  color: var(--text);
  outline: none;
}

#cidr:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

.presets {
  display: flex;
  gap: 0.3rem;
}

.preset {
  padding: 0.5rem 0.85rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.82rem;
  font-weight: 700;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.preset:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.error-msg {
  font-size: 0.82rem;
  color: var(--error, #dc2626);
  font-weight: 500;
}

/* 결과 표 */
.result-table {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

.result-table th, .result-table td {
  padding: 0.6rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.result-table tr:last-child th,
.result-table tr:last-child td {
  border-bottom: none;
}

.result-table th {
  background: var(--bg);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-sub);
  width: 40%;
  letter-spacing: 0.02em;
}

.result-table td {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}

.result-table tr:hover {
  background: rgba(102, 126, 234, 0.04);
}

/* 액션 */
.action-row {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 1.5rem;
}

.btn-copy {
  padding: 0.5rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-copy:hover {
  filter: brightness(1.08);
}

@media (max-width: 600px) {
  #cidr { font-size: 1rem; }
  .result-table th, .result-table td { padding: 0.5rem 0.7rem; font-size: 0.82rem; }
  .result-table th { width: 45%; }
}