/* ===== Design tokens ===== */
:root,
[data-theme='light'] {
  /* Surfaces — warm stone / chalk */
  --color-bg: #f2eee4;
  --color-surface: #ffffff;
  --color-surface-2: #f8f5ec;
  --color-surface-offset: #ece6d6;
  --color-border: #ddd5c0;
  --color-divider: #e5dfcd;

  /* Text — graphite */
  --color-text: #201d17;
  --color-text-muted: #6b6656;
  --color-text-faint: #a49d87;
  --color-text-inverse: #fbf8f0;

  /* Primary — alpine teal (rock / glacier) */
  --color-primary: #0e6f63;
  --color-primary-hover: #0a5850;
  --color-primary-active: #08423c;
  --color-primary-highlight: #cfe4de;

  /* Accent — climbing rope orange */
  --color-accent: #c85a12;
  --color-accent-hover: #a8480a;
  --color-accent-highlight: #ecd3ba;

  --color-success: #3f7d2a;
  --color-success-highlight: #d9e6cf;
  --color-warning: #a15a15;
  --color-warning-highlight: #ecdbc7;
  --color-error: #a02c4a;
  --color-error-highlight: #e6d2d8;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --transition-interactive: 160ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 80 / 0.08);
  --shadow-md: 0 6px 16px oklch(0.2 0.02 80 / 0.1);
  --shadow-lg: 0 16px 36px oklch(0.2 0.02 80 / 0.16);

  --content-default: 1040px;

  --font-display: 'Cabinet Grotesk', 'Trebuchet MS', sans-serif;
  --font-body: 'Satoshi', 'Segoe UI', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #16130f;
  --color-surface: #1f1b14;
  --color-surface-2: #251f16;
  --color-surface-offset: #2a2318;
  --color-border: #3a3122;
  --color-divider: #322a1d;

  --color-text: #f0ead9;
  --color-text-muted: #ab9f83;
  --color-text-faint: #6d6450;
  --color-text-inverse: #201d17;

  --color-primary: #4bb3a2;
  --color-primary-hover: #6ec4b6;
  --color-primary-active: #86cec2;
  --color-primary-highlight: #253a35;

  --color-accent: #e8813c;
  --color-accent-hover: #f0985f;
  --color-accent-highlight: #3d2c1c;

  --color-success: #7cb85b;
  --color-success-highlight: #263420;
  --color-warning: #d68f4e;
  --color-warning-highlight: #3a2c1c;
  --color-error: #d16a86;
  --color-error-highlight: #3a2229;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 16px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 16px 36px oklch(0 0 0 / 0.45);
}

:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.82rem + 0.3vw, 1rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.5vw, 1.375rem);
  --text-xl: clamp(1.375rem, 1.2rem + 1vw, 1.875rem);
  --text-2xl: clamp(1.75rem, 1.4rem + 2vw, 2.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
}

/* ===== Layout shell ===== */
.app {
  max-width: var(--content-default);
  margin-inline: auto;
  padding: var(--space-6) var(--space-4) var(--space-16);
}

.widget-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  color: var(--color-primary);
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xl);
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.brand-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: var(--space-2);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-8);
  overflow-x: auto;
}

.tab {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}
.tab:hover {
  color: var(--color-text);
}
.tab[aria-selected='true'] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}
.panel[hidden] {
  display: none;
}

/* ===== Cards / sections ===== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.card-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
}

.card-note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  max-width: 68ch;
}

/* ===== Formula callout ===== */
.formula-box {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  background: var(--color-primary-highlight);
  border: 1px solid color-mix(in oklab, var(--color-primary) 30%, var(--color-border));
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text);
}
.formula-box code {
  font-family: var(--font-display);
}

/* ===== Inputs ===== */
.field-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 180px;
}
.field label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.field input,
.field select {
  height: 42px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-sm);
}
.field input:focus-visible,
.field select:focus-visible {
  border-color: var(--color-primary);
}

/* ===== Tables ===== */
.table-scroll {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
}

table.data {
  min-width: 100%;
}

table.data th,
table.data td {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  text-align: center;
  border-bottom: 1px solid var(--color-divider);
  white-space: nowrap;
}
table.data th:first-child,
table.data td:first-child {
  text-align: left;
}

table.data thead th {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-display);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: 0.7rem;
  white-space: normal;
  vertical-align: middle;
}

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

table.data tbody tr:hover td {
  background: color-mix(in oklab, var(--color-primary) 6%, transparent);
}

table.data tfoot td {
  font-weight: 700;
  background: var(--color-primary-highlight);
  border-top: 2px solid var(--color-primary);
}

table.data input,
table.data select {
  width: 100%;
  min-width: 68px;
  height: 34px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-xs);
  text-align: center;
}
table.data input[type='text'] {
  text-align: left;
  min-width: 140px;
}
table.data td.computed {
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  background: color-mix(in oklab, var(--color-surface-offset) 70%, transparent);
}
table.data td.computed.strong {
  color: var(--color-text);
  font-weight: 700;
}

.row-remove {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  display: inline-grid;
  place-items: center;
  color: var(--color-error);
  border: 1px solid transparent;
}
.row-remove:hover {
  background: var(--color-error-highlight);
}

/* ===== Buttons ===== */
.btn {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===== KPI cards ===== */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4);
  margin: var(--space-2) 0 var(--space-6);
}
.kpi {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}
.kpi.accent {
  background: var(--color-primary-highlight);
  border-color: color-mix(in oklab, var(--color-primary) 40%, var(--color-border));
}
.kpi-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: var(--space-1);
}
.kpi-value {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

/* ===== Section divider ===== */
.section-divider {
  border: none;
  border-top: 1px solid var(--color-divider);
  margin: var(--space-2) 0 var(--space-6);
}

.footnote {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .widget-header {
    flex-direction: column;
  }
  .field {
    min-width: 140px;
    flex: 1 1 140px;
  }
}