:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-soft: #eef4fa;
  --ink: #172033;
  --muted: #667086;
  --border: #d7e0eb;
  --blue: #2b7bd4;
  --blue-deep: #175493;
  --cyan: #0f8a9d;
  --green: #2f855a;
  --violet: #5966d6;
  --rose: #b84a62;
  --amber: #946200;
  --shadow: 0 18px 48px rgba(23, 32, 51, 0.1);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

:focus-visible {
  outline: 3px solid rgba(43, 123, 212, 0.38);
  outline-offset: 2px;
}

.app-shell {
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 22px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand img {
  flex: 0 0 auto;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--cyan);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(1.55rem, 1.25rem + 1vw, 2.3rem);
  line-height: 1.06;
}

h2 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
}

h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
}

.topbar-actions,
.form-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.button {
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0 14px;
  font-weight: 850;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

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

.button-secondary {
  background: #e6f0fb;
  border-color: #c6d9ee;
  color: var(--blue-deep);
}

.button-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: minmax(310px, 400px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.entry-panel {
  position: sticky;
  top: 18px;
  padding: 18px;
}

.panel-heading {
  margin-bottom: 16px;
}

.inline-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.field,
.select-field,
.search-field {
  display: grid;
  gap: 7px;
}

.field {
  margin-bottom: 13px;
}

.field span,
.select-field span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 850;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fbfdff;
  color: var(--ink);
  padding: 11px 12px;
}

textarea {
  min-height: 96px;
  resize: vertical;
}

.form-status {
  min-height: 20px;
  margin: 0 0 12px;
  color: var(--rose);
  font-size: 0.88rem;
  font-weight: 750;
}

.workspace {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metric-card {
  min-height: 108px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.metric-card.metric-warning {
  border-color: rgba(184, 74, 98, 0.45);
}

.metric-card span {
  display: block;
  color: var(--muted);
  font-size: 0.79rem;
  font-weight: 850;
}

.metric-card strong {
  display: block;
  margin-top: 9px;
  font-size: 1.75rem;
  line-height: 1;
}

.metric-card p {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(140px, 190px) minmax(140px, 190px);
  gap: 12px;
  align-items: end;
  padding: 14px;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.tab {
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #edf3f9;
  color: var(--muted);
  font-weight: 850;
}

.tab.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: #ffffff;
}

.view {
  display: none;
}

.view.is-active {
  display: block;
}

.segment-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.segment-card {
  display: grid;
  gap: 14px;
  min-height: 292px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 5px solid var(--blue);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.segment-card[data-environment="dmz"] {
  border-left-color: var(--rose);
}

.segment-card[data-environment="wan"] {
  border-left-color: var(--violet);
}

.segment-card[data-environment="lab"] {
  border-left-color: var(--cyan);
}

.card-top,
.card-footer {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.segment-meta {
  min-width: 0;
}

.segment-meta p,
.segment-purpose {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.stage-chip,
.count-pill,
.owner-pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 850;
  white-space: nowrap;
}

.stage-chip {
  padding: 0 10px;
  background: #e8f1fb;
  color: var(--blue-deep);
  text-transform: capitalize;
}

.stage-chip.high {
  background: #fff4d8;
  color: var(--amber);
}

.stage-chip.critical {
  background: #fbe7ec;
  color: var(--rose);
}

.count-pill,
.owner-pill {
  padding: 0 10px;
  background: #eef4fa;
  color: var(--muted);
}

.segment-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.kv {
  min-height: 64px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fbfdff;
}

.kv span {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 850;
  text-transform: uppercase;
}

.kv strong {
  display: block;
  font-size: 0.9rem;
  line-height: 1.25;
}

.overlap-ok,
.overlap-warning {
  margin: 0;
  padding: 10px;
  border-radius: var(--radius);
  font-size: 0.88rem;
  font-weight: 780;
}

.overlap-ok {
  background: #e9f7f0;
  color: var(--green);
}

.overlap-warning {
  background: #fbe7ec;
  color: var(--rose);
}

.mini-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.mini-button {
  min-height: 34px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fbfdff;
  color: var(--ink);
  padding: 0 10px;
  font-size: 0.82rem;
  font-weight: 820;
}

.danger {
  color: var(--rose);
}

.calc-grid,
.change-grid {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 14px;
}

.calc-controls,
.calc-output-panel,
.change-controls,
.change-output,
.topology-panel {
  padding: 16px;
}

.table {
  display: grid;
  gap: 8px;
}

.table-row {
  display: grid;
  grid-template-columns: minmax(128px, 1.1fr) minmax(110px, 0.8fr) minmax(86px, 0.6fr) minmax(210px, 1.5fr);
  gap: 10px;
  align-items: center;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fbfdff;
  overflow-x: auto;
}

.table-row.is-heading {
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.checklist-stack {
  display: grid;
  gap: 12px;
}

.checklist-section {
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fbfdff;
}

.checklist-section h3 {
  margin-bottom: 10px;
}

.checklist {
  display: grid;
  gap: 9px;
}

.check-row {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 9px;
  align-items: start;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.check-row input {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--blue);
}

.topology-map {
  display: grid;
  gap: 12px;
}

.site-card {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fbfdff;
}

.environment-lanes {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.environment-lane {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.environment-lane > span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.topology-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.topology-chip {
  min-height: 34px;
  border: 1px solid #c6d9ee;
  border-radius: var(--radius);
  background: #e8f1fb;
  color: var(--blue-deep);
  padding: 0 10px;
  font-size: 0.82rem;
  font-weight: 850;
}

.topology-chip.high {
  border-color: #ead7a8;
  background: #fff4d8;
  color: var(--amber);
}

.topology-chip.critical {
  border-color: #efbdc9;
  background: #fbe7ec;
  color: var(--rose);
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 220px;
  padding: 24px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: #fbfdff;
  text-align: center;
}

.empty-state p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

@media (max-width: 1120px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .entry-panel {
    position: static;
  }
}

@media (max-width: 900px) {
  .app-shell {
    padding: 16px;
  }

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

  .metrics-grid,
  .segment-list,
  .calc-grid,
  .change-grid {
    grid-template-columns: 1fr;
  }

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

  .table-row {
    grid-template-columns: minmax(160px, 1fr);
  }
}

@media (max-width: 560px) {
  .topbar-actions,
  .form-actions,
  .tabs {
    grid-template-columns: 1fr;
    width: 100%;
  }

  .topbar-actions,
  .form-actions {
    display: grid;
  }

  .button,
  .tab {
    width: 100%;
  }

  .field-grid,
  .segment-body,
  .environment-lane {
    grid-template-columns: 1fr;
  }

  .card-top,
  .card-footer {
    flex-direction: column;
  }

  .mini-actions {
    justify-content: flex-start;
  }
}