:root {
  --color-black: #000000;
  --color-white: #ffffff;
  --color-bg-alt: #333333;
  --color-dim: #888888;
  --color-border: #cccccc;
  --color-border-dark: #000000;
  --color-error: #ff0000;
  --font-mono: "JetBrains Mono", "SF Mono", "ui-monospace", "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
  --base-unit: 8px;
  --radius-none: 0px;
  --radius-pill: 9999px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-black);
  background: var(--color-white);
}

::selection {
  background: var(--color-black);
  color: var(--color-white);
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: calc(var(--base-unit) * 4) calc(var(--base-unit) * 2);
}

.site-header {
  margin-bottom: calc(var(--base-unit) * 6);
}

.header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: calc(var(--base-unit) * 2);
}

.header-link {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-dim);
  text-decoration: none;
  border: 1px solid var(--color-border);
  padding: calc(var(--base-unit) * 0.75) calc(var(--base-unit) * 1.5);
  border-radius: var(--radius-pill);
  transition: background 150ms linear, color 150ms linear;
  white-space: nowrap;
  margin-top: 2px;
}

.header-link:hover {
  background: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.site-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.site-subtitle {
  font-size: 12px;
  color: var(--color-dim);
  margin-top: var(--base-unit);
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-dim);
  margin-bottom: calc(var(--base-unit) * 2);
}

.category {
  margin-bottom: calc(var(--base-unit) * 6);
}

hr {
  border: 0;
  height: 1px;
  background: var(--color-border);
  margin: calc(var(--base-unit) * 6) 0;
  width: 100%;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  margin-bottom: calc(var(--base-unit) * 2);
  border-bottom: 1px solid var(--color-border);
}

.tab-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: calc(var(--base-unit) * 1.5) calc(var(--base-unit) * 2.5);
  border: 1px solid var(--color-border);
  border-bottom: none;
  background: var(--color-white);
  color: var(--color-black);
  cursor: pointer;
  border-radius: var(--radius-none);
  margin-right: -1px;
  transition: background 150ms linear, color 150ms linear;
}

.tab-btn:hover {
  background: var(--color-bg-alt);
  color: var(--color-white);
}

.tab-btn.active {
  background: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
  z-index: 1;
}

.tab-panels {
  position: relative;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Cards */
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  background: var(--color-white);
  padding: calc(var(--base-unit) * 2);
}

/* Forms */
.tool-form {
  display: flex;
  flex-direction: column;
  gap: calc(var(--base-unit) * 2);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--base-unit);
}

.form-group label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-dim);
}

.form-row {
  display: flex;
  gap: calc(var(--base-unit) * 2);
  align-items: flex-end;
}

.form-row .form-group {
  flex: 1;
}

.form-actions {
  display: flex;
  gap: calc(var(--base-unit) * 1.5);
  align-items: center;
  margin-top: calc(var(--base-unit) * 0.5);
}

input[type="text"],
input[type="number"],
select {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.4;
  padding: calc(var(--base-unit) * 1.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  background: var(--color-white);
  color: var(--color-black);
  outline: none;
  width: 100%;
  transition: border-color 150ms linear;
}

input:focus,
select:focus {
  border-color: var(--color-black);
}

input::placeholder {
  color: var(--color-dim);
  font-variant-numeric: tabular-nums;
}

.input-small {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: calc(var(--base-unit) * 0.75) calc(var(--base-unit) * 1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  background: var(--color-white);
  color: var(--color-black);
  outline: none;
}

.input-select {
  font-family: var(--font-mono);
  font-size: 14px;
  padding: calc(var(--base-unit) * 1.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  background: var(--color-white);
  color: var(--color-black);
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%23000000' d='M0 0h10L5 6z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

/* Buttons */
.btn {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: calc(var(--base-unit) * 1.5) calc(var(--base-unit) * 2.5);
  border: 1px solid var(--color-black);
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--base-unit);
  white-space: nowrap;
  transition: background 150ms linear, color 150ms linear, border-color 150ms linear;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-white);
  color: var(--color-black);
}

.btn-ghost {
  background: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-black);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-black);
  color: var(--color-white);
}

.btn-small {
  padding: calc(var(--base-unit) * 0.75) calc(var(--base-unit) * 1.5);
  font-size: 11px;
}

/* Spinner */
.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-black);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Alert / Errors */
.alert {
  font-size: 12px;
  line-height: 1.4;
  padding: calc(var(--base-unit) * 1.5) calc(var(--base-unit) * 2);
  border-left: 2px solid var(--color-error);
  color: var(--color-black);
  background: var(--color-white);
}

.field-error {
  font-size: 11px;
  color: var(--color-error);
  min-height: 14px;
  display: block;
}

.field-helper {
  font-size: 11px;
  color: var(--color-muted);
  display: block;
  margin-top: 2px;
}

/* Results */
.results {
  margin-top: calc(var(--base-unit) * 3);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: calc(var(--base-unit) * 1.5);
}

.result-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  padding: calc(var(--base-unit) * 2);
  background: var(--color-white);
}

.result-card .label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-dim);
  margin-bottom: var(--base-unit);
  display: block;
}

.result-card .value {
  font-size: 16px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.result-open {
  border-left: 3px solid #22c55e;
}

.result-closed {
  border-left: 3px solid var(--color-error);
}

/* Console */
.console {
  background: var(--color-black);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  padding: calc(var(--base-unit) * 2);
  border-radius: var(--radius-none);
  overflow-x: auto;
  white-space: pre-wrap;
}

.console .green {
  color: #00ff00;
}

.console .red {
  color: #ff0000;
}

/* Data Tables */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  line-height: 1.4;
}

.data-table thead th {
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-dim);
  padding: calc(var(--base-unit) * 1.5);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-white);
  white-space: nowrap;
}

.data-table tbody td {
  padding: calc(var(--base-unit) * 1.5);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-black);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover td {
  background: #f6f6f6;
}

/* Pagination */
.pagination-bar {
  display: flex;
  align-items: center;
  gap: var(--base-unit);
}

.page-info {
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--color-dim);
  min-width: 80px;
  text-align: center;
}

/* Hosts area */
.hosts-area {
  margin-top: calc(var(--base-unit) * 3);
}

.hosts-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--base-unit);
  margin-bottom: calc(var(--base-unit) * 1.5);
}

/* WHOIS key-value */
.whois-kv {
  display: flex;
  flex-direction: column;
  gap: var(--base-unit);
}

.whois-row {
  display: flex;
  flex-direction: column;
  gap: calc(var(--base-unit) * 0.5);
  padding: calc(var(--base-unit) * 1.5) 0;
  border-bottom: 1px solid var(--color-border);
}

.whois-row:last-child {
  border-bottom: none;
}

.whois-key {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-dim);
}

.whois-value {
  font-size: 14px;
  word-break: break-word;
  color: var(--color-black);
}

/* Progress bar */
.progress-area {
  margin-top: calc(var(--base-unit) * 3);
}

.progress-bar-container {
  width: 100%;
  height: calc(var(--base-unit) * 1.5);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--color-black);
  width: 0%;
  transition: width 150ms linear;
}

.progress-label {
  font-size: 12px;
  color: var(--color-dim);
  margin-top: var(--base-unit);
}

/* Toast */
.toast-container {
  position: fixed;
  top: calc(var(--base-unit) * 2);
  right: calc(var(--base-unit) * 2);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--base-unit);
}

.toast {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  padding: calc(var(--base-unit) * 1.5) calc(var(--base-unit) * 2);
  border: 1px solid var(--color-border);
  border-left: 2px solid var(--color-black);
  background: var(--color-white);
  color: var(--color-black);
  box-shadow: none;
  border-radius: var(--radius-none);
  animation: toastIn 150ms linear;
  max-width: 320px;
  word-break: break-word;
}

.toast.toast-error {
  border-left-color: var(--color-error);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Footer */
.site-footer {
  margin-top: calc(var(--base-unit) * 6);
  padding-top: calc(var(--base-unit) * 3);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-brand {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-black);
}

.footer-ad {
  margin-top: calc(var(--base-unit) * 1.5);
  font-size: 11px;
  color: var(--color-dim);
  letter-spacing: 0.02em;
}

.footer-links {
  margin-top: calc(var(--base-unit) * 1.5);
}

.footer-link {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-dim);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color 150ms linear;
}

.footer-link:hover {
  color: var(--color-black);
}

.footer-ad-unit {
  margin-top: calc(var(--base-unit) * 2);
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Field helpers */
.field-helper {
  font-size: 11px;
  color: var(--color-dim);
  margin-top: calc(var(--base-unit) * 0.5);
}

/* Docs page */
.docs-content h2 {
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: calc(var(--base-unit) * 4);
  margin-bottom: calc(var(--base-unit) * 2);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: calc(var(--base-unit) * 1);
}

.docs-content h3 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-top: calc(var(--base-unit) * 2);
  margin-bottom: calc(var(--base-unit) * 1);
}

.docs-content p {
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: calc(var(--base-unit) * 2);
}

.docs-content code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--color-bg-alt);
  color: var(--color-white);
  padding: 1px 4px;
}

.docs-content ul {
  list-style: disc;
  margin-left: calc(var(--base-unit) * 3);
  margin-bottom: calc(var(--base-unit) * 2);
  font-size: 13px;
  line-height: 1.6;
}

/* Utilities */
.hidden {
  display: none !important;
}

@media (max-width: 640px) {
  .page {
    padding: calc(var(--base-unit) * 2) calc(var(--base-unit) * 1.5);
  }

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

  .form-row {
    flex-direction: column;
    align-items: stretch;
  }

  .tabs {
    flex-wrap: wrap;
  }

  .tab-btn {
    flex: 1;
    min-width: 60px;
  }

  .hosts-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .pagination-bar {
    width: 100%;
    justify-content: space-between;
  }
}