/* Theme tokens */
:root {
  color-scheme: light;
  --cidr-bg: #f3f6f9;
  --cidr-panel: #ffffff;
  --cidr-panel-soft: #f7f9fc;
  --cidr-border: #cbd5e1;
  --cidr-text: #172033;
  --cidr-muted: #5b677a;
  --cidr-primary: #0969da;
  --cidr-primary-hover: #0757b8;
  --cidr-info-bg: #e8f4ff;
  --cidr-info-border: #8cc8ff;
  --cidr-success: #137333;
  --cidr-warning: #9a6700;
  --cidr-danger: #cf222e;
  --cidr-network: #0969da;
  --cidr-host: #bf8700;
  --cidr-code: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  --cidr-content-width: 1380px;
  --cidr-control-height: 40px;
  --cidr-space-xs: 8px;
  --cidr-space-sm: 12px;
  --cidr-space-md: 14px;
  --cidr-space-lg: 16px;
  --cidr-radius-control: 7px;
  --cidr-radius-item: 8px;
  --cidr-radius-notice: 9px;
  --cidr-radius-panel: 10px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --cidr-bg: #0d1117;
  --cidr-panel: #161b22;
  --cidr-panel-soft: #1f2630;
  --cidr-border: #46505f;
  --cidr-text: #f0f3f6;
  --cidr-muted: #a7b0bf;
  --cidr-primary: #2f81f7;
  --cidr-primary-hover: #58a6ff;
  --cidr-info-bg: #102b46;
  --cidr-info-border: #266aa8;
  --cidr-success: #56d364;
  --cidr-warning: #e3b341;
  --cidr-danger: #ff7b72;
  --cidr-network: #58a6ff;
  --cidr-host: #e3b341;
}

html[data-tool="cidr-subnet-calculator"],
html[data-tool="cidr-subnet-calculator"] * {
  box-sizing: border-box;
}

/* Page frame */
body.cidr-page {
  min-height: 100vh;
  margin: 0;
  color: var(--cidr-text);
  background: var(--cidr-bg);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
}

.cidr-main {
  width: min(var(--cidr-content-width), calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.cidr-page-header {
  margin-bottom: var(--cidr-space-lg);
}

.cidr-page-header h1 {
  margin: var(--cidr-space-xs) 0 4px;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  line-height: 1.35;
}

:is(.cidr-page-header, .cidr-panel-heading) p {
  margin: 4px 0 0;
  color: var(--cidr-muted);
}

.cidr-breadcrumb {
  display: flex;
  gap: var(--cidr-space-xs);
  align-items: center;
  font-size: .9rem;
}

.cidr-breadcrumb a {
  color: var(--cidr-primary);
  font-weight: 700;
}

.cidr-notice {
  margin-bottom: var(--cidr-space-lg);
  padding: var(--cidr-space-sm) var(--cidr-space-md);
  border: 1px solid var(--cidr-info-border);
  border-radius: var(--cidr-radius-notice);
  color: var(--cidr-primary);
  background: var(--cidr-info-bg);
}

/* Panels and form controls */
.cidr-panel {
  margin-bottom: var(--cidr-space-lg);
  padding: 18px;
  border: 1px solid var(--cidr-border);
  border-radius: var(--cidr-radius-panel);
  background: var(--cidr-panel);
}

.cidr-panel-heading {
  margin-bottom: var(--cidr-space-md);
}

.cidr-panel-heading h2,
.cidr-binary-panel h3 {
  margin: 0;
}

.cidr-panel-heading h2 {
  font-size: 1.15rem;
}

.cidr-panel-heading--row {
  display: flex;
  justify-content: space-between;
  gap: var(--cidr-space-lg);
  align-items: flex-start;
}

.cidr-input-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--cidr-space-sm);
}

.cidr-input-grid--with-action {
  grid-template-columns: minmax(260px, 2fr) minmax(180px, 1fr) auto;
  align-items: end;
}

:is(.cidr-field, .cidr-theme-field) {
  display: grid;
  gap: 6px;
  font-weight: 700;
}

.cidr-theme-field {
  grid-template-columns: auto minmax(110px, 145px);
  align-items: center;
}

:is(.cidr-control, .cidr-button) {
  min-height: var(--cidr-control-height);
  border: 1px solid var(--cidr-border);
  border-radius: var(--cidr-radius-control);
  color: var(--cidr-text);
  background: var(--cidr-panel-soft);
  font: inherit;
}

.cidr-control {
  width: 100%;
  padding: 8px 10px;
}

:is(.cidr-code, .cidr-result-grid dd span, .cidr-table td) {
  font-family: var(--cidr-code);
}

.cidr-actions {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: var(--cidr-space-xs);
  margin-top: var(--cidr-space-md);
}

.cidr-button {
  padding: 7px 13px;
  font-weight: 700;
  cursor: pointer;
}

.cidr-button:hover:not(:disabled) {
  border-color: var(--cidr-primary);
  color: var(--cidr-primary);
}

.cidr-button--primary {
  border-color: var(--cidr-primary);
  color: #ffffff;
  background: var(--cidr-primary);
}

.cidr-button--primary:hover:not(:disabled) {
  color: #ffffff;
  background: var(--cidr-primary-hover);
}

.cidr-button--small {
  min-height: 30px;
  padding: 3px 8px;
  font-size: .78rem;
}

.cidr-button--field {
  white-space: nowrap;
}

.cidr-button:disabled {
  cursor: not-allowed;
  opacity: .5;
}

.cidr-page :is(button, input, select):focus-visible {
  outline: 3px solid color-mix(in srgb, var(--cidr-primary) 40%, transparent);
  outline-offset: 2px;
}

/* Status messages */
.cidr-message {
  --cidr-message-accent: var(--cidr-primary);
  min-height: 24px;
  margin: var(--cidr-space-md) 0 0;
  padding: 9px 11px;
  border-left: 4px solid var(--cidr-message-accent);
  background: var(--cidr-panel-soft);
}

.cidr-message[data-type="success"] {
  --cidr-message-accent: var(--cidr-success);
}

.cidr-message[data-type="warning"] {
  --cidr-message-accent: var(--cidr-warning);
}

.cidr-message[data-type="error"] {
  --cidr-message-accent: var(--cidr-danger);
}

.cidr-message:is([data-type="success"], [data-type="warning"], [data-type="error"]) {
  color: var(--cidr-message-accent);
}

/* Calculation results */
.cidr-result-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
}

.cidr-result-grid > div {
  min-width: 0;
  padding: 11px 12px;
  border: 1px solid var(--cidr-border);
  border-radius: var(--cidr-radius-item);
  background: var(--cidr-panel-soft);
}

.cidr-result-grid dt {
  color: var(--cidr-muted);
  font-size: .82rem;
  font-weight: 700;
}

.cidr-result-grid dd {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  margin: 5px 0 0;
}

.cidr-result-grid dd span {
  min-width: 0;
  overflow-wrap: anywhere;
  font-weight: 700;
}

/* Binary address visualization */
.cidr-binary-panel {
  margin-top: var(--cidr-space-lg);
  padding: var(--cidr-space-md);
  border: 1px solid var(--cidr-border);
  border-radius: var(--cidr-radius-item);
  background: var(--cidr-panel-soft);
}

.cidr-binary-panel > p {
  display: flex;
  gap: 6px;
  align-items: center;
  margin: 6px 0 var(--cidr-space-sm);
  color: var(--cidr-muted);
  font-size: .85rem;
}

.cidr-key {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-left: 8px;
  border-radius: 3px;
}

.cidr-key:first-child {
  margin-left: 0;
}

:is(.cidr-key--network, .cidr-bit--network) {
  color: #ffffff;
  background: var(--cidr-network);
}

:is(.cidr-key--host, .cidr-bit--host) {
  color: #111827;
  background: var(--cidr-host);
}

.cidr-binary-row {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 10px;
  align-items: center;
  margin-top: 7px;
}

.cidr-binary-row code {
  display: flex;
  overflow-x: auto;
  padding-bottom: 4px;
  font-family: var(--cidr-code);
}

.cidr-bit {
  display: inline-grid;
  flex: 0 0 22px;
  height: 27px;
  place-items: center;
}

.cidr-bit-separator {
  display: inline-grid;
  flex: 0 0 11px;
  place-items: center;
  font-weight: 800;
}

/* Subnet table and pagination */
.cidr-table-wrap {
  overflow-x: auto;
  margin-top: var(--cidr-space-md);
  border: 1px solid var(--cidr-border);
  border-radius: var(--cidr-radius-item);
}

.cidr-table {
  width: 100%;
  min-width: 1000px;
  border-collapse: collapse;
}

.cidr-table th,
.cidr-table td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--cidr-border);
  text-align: left;
  white-space: nowrap;
}

.cidr-table th {
  background: var(--cidr-panel-soft);
  font-size: .86rem;
}

.cidr-table tbody tr:last-child td {
  border-bottom: 0;
}

.cidr-pagination {
  display: flex;
  justify-content: space-between;
  gap: var(--cidr-space-sm);
  align-items: center;
  margin-top: var(--cidr-space-sm);
}

.cidr-pagination-actions {
  display: flex;
  gap: 7px;
}

/* Accessibility helpers */
.cidr-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Responsive layout */
@media (max-width: 900px) {
  .cidr-result-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cidr-input-grid--with-action {
    grid-template-columns: 1fr 1fr;
  }

  .cidr-button--field {
    grid-column: 1 / -1;
    justify-self: end;
  }
}

@media (max-width: 680px) {
  .cidr-main {
    width: min(100% - 24px, var(--cidr-content-width));
    padding-top: 24px;
  }

  .cidr-panel {
    padding: var(--cidr-space-md);
  }

  :is(.cidr-panel-heading--row, .cidr-pagination) {
    align-items: stretch;
    flex-direction: column;
  }

  .cidr-theme-field {
    grid-template-columns: auto 1fr;
  }

  .cidr-input-grid,
  .cidr-result-grid {
    grid-template-columns: 1fr;
  }

  .cidr-button--field {
    grid-column: auto;
    justify-self: stretch;
  }

  :is(.cidr-actions, .cidr-pagination-actions) {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  :is(.cidr-actions, .cidr-pagination) .cidr-button {
    width: 100%;
  }

  .cidr-result-grid dd {
    align-items: flex-start;
  }
}