/* Subnet calculator — scoped under .tool-subnet. */

.tool-subnet {
  --tool-gap: 1rem;
  --tool-radius: var(--radius-sm, 6px);
  max-width: 640px;
}

.tool-subnet .tool-tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border, currentColor);
  margin-bottom: var(--tool-gap);
}

.tool-subnet .tool-tabs [role="tab"] {
  background: transparent;
  border: none;
  padding: 0.5rem 0.875rem;
  font: inherit;
  color: inherit;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}

.tool-subnet .tool-tabs [role="tab"][aria-selected="true"] {
  border-bottom-color: var(--accent, currentColor);
  font-weight: 600;
}

.tool-subnet .tool-tabs [role="tab"]:focus-visible {
  outline: 2px solid var(--accent, currentColor);
  outline-offset: 2px;
}

.tool-subnet .tool-form {
  display: flex;
  flex-direction: column;
  gap: var(--tool-gap);
}

.tool-subnet .tool-form[hidden] {
  display: none;
}

.tool-subnet .tool-form label {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  font-size: 0.95rem;
}

.tool-subnet .tool-form input,
.tool-subnet .tool-form textarea {
  font: inherit;
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  padding: 0.5rem 0.625rem;
  border: 1px solid var(--border, currentColor);
  border-radius: var(--tool-radius);
  background: var(--bg, transparent);
  color: inherit;
  width: 100%;
  box-sizing: border-box;
}

.tool-subnet .tool-form input:focus-visible,
.tool-subnet .tool-form textarea:focus-visible {
  outline: 2px solid var(--accent, currentColor);
  outline-offset: 1px;
}

.tool-subnet .tool-form button[type="submit"] {
  align-self: flex-start;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--tool-radius);
  background: var(--text, currentColor);
  color: var(--bg, white);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.tool-subnet .tool-form button[type="submit"]:focus-visible {
  outline: 2px solid var(--accent, currentColor);
  outline-offset: 2px;
}

.tool-subnet .tool-output:empty { display: none; }

.tool-subnet .tool-result {
  margin-top: var(--tool-gap);
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 0.95rem;
}

.tool-subnet .tool-result-info {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.25rem 1rem;
}

.tool-subnet .tool-result-info dt {
  font-family: var(--font-sans, system-ui, sans-serif);
  font-weight: 600;
  opacity: 0.75;
}

.tool-subnet .tool-result-info dd {
  margin: 0;
  /* IPv6 expanded addresses are 39 chars long — let them wrap on narrow
     viewports rather than blow past the column edge. */
  overflow-wrap: anywhere;
  word-break: break-word;
}

.tool-subnet .tool-result-vlsm {
  width: 100%;
  border-collapse: collapse;
}

.tool-subnet .tool-result-vlsm th,
.tool-subnet .tool-result-vlsm td {
  text-align: left;
  padding: 0.375rem 0.625rem;
  border-bottom: 1px solid var(--border, currentColor);
}

.tool-subnet .tool-result-vlsm th {
  font-family: var(--font-sans, system-ui, sans-serif);
  opacity: 0.75;
}

.tool-subnet .tool-note {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  opacity: 0.8;
  font-style: italic;
}

.tool-subnet .tool-error {
  margin-top: var(--tool-gap);
  padding: 0.625rem 0.875rem;
  border-radius: var(--tool-radius);
  border: 1px solid var(--error, #c0392b);
  background: rgba(239, 68, 68, 0.10);
  color: inherit;
  font-size: 0.95rem;
}

.tool-subnet .tool-input-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

/* IP is 15 chars max — no need for the input to span the full row.
   The prefix dropdown carries "/24 — 255.255.255.0" plus a chevron,
   so it needs enough room not to clip the trailing ".0". */
.tool-subnet .tool-input-row .tool-input-ip {
  flex: 1 1 14rem;
  min-width: 11rem;
}

.tool-subnet .tool-input-row .tool-input-prefix {
  flex: 1 1 17rem;
  min-width: 15rem;
}

.tool-subnet .tool-input-row select {
  font: inherit;
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  padding: 0.5rem 0.625rem;
  border: 1px solid var(--border, currentColor);
  border-radius: var(--radius-sm, 6px);
  background: var(--bg, transparent);
  color: inherit;
  width: 100%;
  box-sizing: border-box;
}

.tool-subnet .tool-input-row select:focus-visible {
  outline: 2px solid var(--accent, currentColor);
  outline-offset: 1px;
}

@media (max-width: 480px) {
  .tool-subnet .tool-form button[type="submit"] {
    align-self: stretch;
  }
  .tool-subnet .tool-result-info {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .tool-subnet .tool-result-info dt { margin-top: 0.5rem; }
  .tool-subnet .tool-input-row {
    flex-direction: column;
    gap: var(--tool-gap);
    align-items: stretch;
  }
  /* In column flex, flex-basis is interpreted as height — reset both
     labels so they hug their content vertically. */
  .tool-subnet .tool-input-row .tool-input-ip,
  .tool-subnet .tool-input-row .tool-input-prefix {
    flex: 0 0 auto;
    min-width: 0;
  }
}

.tool-page-explainer table {
  display: block;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* Personalized "all subnet ranges" panel — sits below the main result.
   Styled as a distinct card so it reads as a separate reference, not
   part of the primary output. */

.tool-subnet .tool-extras {
  margin-top: 2rem;
  padding: 1.25rem 1.25rem 1rem;
  border: 1px solid var(--border, currentColor);
  border-radius: var(--radius-sm, 8px);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.015), transparent 40%),
    var(--bg, transparent);
}

.tool-subnet .tool-extras[hidden] {
  display: none;
}

.tool-subnet .tool-extras-title {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  opacity: 0.7;
}

.tool-subnet .tool-extras-subtitle {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  opacity: 0.6;
  font-style: italic;
}

.tool-subnet .tool-extras-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 -0.25rem;
}

.tool-subnet .tool-extras-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 0.875rem;
}

.tool-subnet .tool-extras-table th,
.tool-subnet .tool-extras-table td {
  text-align: left;
  padding: 0.3rem 0.75rem;
  border-bottom: 1px solid var(--border, currentColor);
  white-space: nowrap;
}

.tool-subnet .tool-extras-table th {
  font-family: var(--font-sans, system-ui, sans-serif);
  font-size: 0.8rem;
  font-weight: 600;
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tool-subnet .tool-extras-table tr:hover td {
  background: rgba(255,255,255,0.02);
}

@media (max-width: 480px) {
  .tool-subnet .tool-extras {
    padding: 1rem 0.875rem 0.75rem;
  }
  .tool-subnet .tool-extras-table {
    font-size: 0.8rem;
  }
}