:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --fg: #111111;
  --muted: #6b6b6b;
  --border: #e5e5e5;
  --accent: #2f6feb;
  --success: #17a34a;
  --warn: #eab308;
  --danger: #dc2626;
  --shadow-raised: 0 2px 8px rgba(17, 17, 17, 0.08);
  --font-display: 'Inter', -apple-system, system-ui, sans-serif;
  --font-body: 'Inter', -apple-system, system-ui, sans-serif;
  --font-mono: ui-monospace, 'JetBrains Mono', monospace;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  text-rendering: geometricPrecision;
}

body {
  margin: 0;
  min-width: 0;
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 20px 16px;
  border-right: 1px solid var(--border);
  background: var(--surface);
}

.brand {
  display: grid;
  gap: 3px;
  padding: 0 8px 12px;
}

.brand-title {
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 12px;
}

.nav-section {
  display: grid;
  gap: 6px;
}

.nav-label {
  padding: 0 8px;
  color: var(--muted);
  font-size: 12px;
}

.nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 38px;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--fg);
}

.nav-link:hover,
.nav-link.active {
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  color: var(--accent);
}

.nav-count {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.main {
  min-width: 0;
  padding: 24px;
}

.page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin: 0 0 20px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  max-width: 980px;
  font-size: clamp(32px, 4vw, 48px);
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 16px;
}

.lead {
  max-width: 780px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 16px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 38px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--fg);
  white-space: nowrap;
}

.btn.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--surface);
}

.btn.ghost {
  background: var(--surface);
}

.btn:focus-visible,
.field:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 30%, transparent);
  outline-offset: 2px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 16px;
}

.panel {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.panel.pad {
  padding: 20px;
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

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

.metric-value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-variant-numeric: tabular-nums;
}

.metric-label {
  color: var(--muted);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 14px;
}

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

.field,
select,
textarea {
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--fg);
}

.field,
textarea {
  padding: 9px 11px;
}

select {
  padding: 8px 36px 8px 11px;
}

.field {
  min-width: min(260px, 100%);
}

.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

.segment {
  min-height: 30px;
  padding: 6px 10px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
}

.segment.active {
  background: var(--fg);
  color: var(--surface);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

table {
  width: 100%;
  min-width: 820px;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}

tbody tr:hover {
  background: var(--bg);
}

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

.mono,
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.muted {
  color: var(--muted);
}

.tag,
.status {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.status.active {
  border-color: color-mix(in srgb, var(--success) 34%, var(--border));
  background: color-mix(in srgb, var(--success) 10%, var(--surface));
  color: color-mix(in srgb, var(--success) 75%, var(--fg));
}

.status.draft {
  border-color: color-mix(in srgb, var(--warn) 42%, var(--border));
  background: color-mix(in srgb, var(--warn) 13%, var(--surface));
  color: color-mix(in srgb, var(--warn) 70%, var(--fg));
}

.status.error {
  border-color: color-mix(in srgb, var(--danger) 35%, var(--border));
  background: color-mix(in srgb, var(--danger) 9%, var(--surface));
  color: color-mix(in srgb, var(--danger) 80%, var(--fg));
}

.status.gray {
  background: color-mix(in srgb, var(--border) 34%, var(--surface));
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 16px;
}

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

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

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

.form-row {
  display: grid;
  gap: 6px;
}

.form-row label {
  color: var(--muted);
  font-size: 12px;
}

.formula-box {
  min-height: 124px;
  width: 100%;
  resize: vertical;
  font-family: var(--font-mono);
}

.formula-box.small {
  min-height: 78px;
}

.field-label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 12px;
}

.tiny {
  margin-top: 8px;
  font-size: 12px;
}

.interactive-table tr.is-selected {
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
}

.table-action {
  display: grid;
  gap: 2px;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
}

.table-action span {
  display: block;
}

.formula-builder {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 12px;
  margin-bottom: 12px;
}

.builder-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 12px;
}

.formula-canvas {
  min-height: 156px;
  display: flex;
  align-content: flex-start;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--border) 16%, var(--surface));
  font-family: var(--font-mono);
}

.formula-token {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 9px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--fg);
  font-size: 12px;
}

.formula-token.operator,
.formula-token.function {
  border-color: color-mix(in srgb, var(--accent) 32%, var(--border));
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  color: var(--accent);
}

.formula-token.cost {
  font-weight: 600;
}

.operator-panel {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.operator-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.operator-grid.functions {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.operator-grid button {
  min-height: 34px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--border) 16%, var(--surface));
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 12px;
}

.operator-grid button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 38px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--border) 20%, var(--surface));
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 26px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 12px;
}

.chip span {
  color: var(--muted);
  font-family: var(--font-body);
}

.chip.is-selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 9%, var(--surface));
  color: var(--accent);
}

.logic-form {
  grid-template-columns: 1fr 1fr;
}

.logic-preview {
  display: grid;
  gap: 8px;
  margin: 0 0 18px;
}

.section-title.compact {
  margin-top: 8px;
}

.code-line {
  display: flex;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--border) 22%, var(--surface));
  font-family: var(--font-mono);
}

.code-line strong {
  color: var(--accent);
  font-weight: 600;
}

.timeline {
  display: grid;
  gap: 12px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 10px;
}

.dot {
  width: 10px;
  height: 10px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.empty {
  min-height: 140px;
  display: grid;
  place-items: center;
  border: 1px dashed var(--border);
  border-radius: 12px;
  color: var(--muted);
  text-align: center;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 10;
  max-width: min(360px, calc(100vw - 40px));
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-raised);
  color: var(--fg);
  transform: translateY(16px);
  opacity: 0;
  pointer-events: none;
  transition: 160ms ease;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.mobile-topbar {
  display: none;
}

@container (max-width: 680px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: 212px minmax(0, 1fr);
  }

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

  .formula-builder {
    grid-template-columns: 1fr;
  }

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

  .span-3,
  .span-4,
  .span-5,
  .span-6 {
    grid-column: span 6;
  }

  .span-7,
  .span-8,
  .span-9 {
    grid-column: span 12;
  }
}

@media (max-width: 834px) {
  .app-shell {
    display: block;
  }

  .mobile-topbar {
    position: sticky;
    top: 0;
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 54px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
  }

  .sidebar {
    position: fixed;
    inset: 54px auto 0 0;
    z-index: 8;
    width: min(300px, 84vw);
    height: auto;
    transform: translateX(-105%);
    transition: 180ms ease;
    box-shadow: var(--shadow-raised);
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

  .main {
    padding: 16px;
  }

  .page-head {
    display: grid;
  }

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8,
  .span-9,
  .span-12 {
    grid-column: span 12;
  }

  .toolbar {
    align-items: stretch;
  }

  .filters,
  .actions {
    width: 100%;
  }

  .field,
  select {
    width: 100%;
  }
}

@media (max-width: 430px) {
  .main {
    padding: 12px;
  }

  .panel.pad {
    padding: 14px;
  }

  .grid {
    gap: 12px;
  }

  .btn {
    width: 100%;
  }

  h1 {
    font-size: 32px;
  }
}