/* ==========================================================================
   System2 Configurator - "What if?" scenario panel (Phase 2)
   Scoped under .scn-panel. Light, smooth, no dark elements. Responsive:
   columns stack on narrow screens.

   In-house design tokens (kept local with a .scn- prefix so this stylesheet
   stands alone and never collides with the shared :root tokens). Values match
   the estate palette named in the spec.
   ========================================================================== */

.scn-panel {
  /* railway-poster palette (2026-06-12) - keep in step with configurator.css */
  --scn-accent: #0f4a39;
  --scn-accent-light: #dfe8e0;
  --scn-success: #2f8a5b;
  --scn-success-light: #e2efe7;
  --scn-success-border: #bcd9c8;
  --scn-warning: #c2611d;
  --scn-warning-light: #f6e7d3;
  --scn-warning-border: #e8c9a8;
  --scn-muted: #897654;
  --scn-border: #ddcca4;
  --scn-section-bg: #f1e7cf;
  --scn-bg: #fbf5e6;
  --scn-fg: #241a10;
  --scn-radius: 12px;
  --scn-radius-sm: 8px;
  --scn-shadow-sm: 0 1px 2px rgba(40, 24, 8, 0.08);
  --scn-shadow-md: 0 4px 14px rgba(40, 24, 8, 0.12);
  --scn-font: 'Hanken Grotesk', 'Segoe UI', system-ui, -apple-system, sans-serif;

  font-family: var(--scn-font);
  color: var(--scn-fg);
  font-size: 14px;
  line-height: 1.55;
}

.scn-panel * {
  box-sizing: border-box;
}

/* ---------- panel header ---------- */
.scn-panel-head {
  margin-bottom: 16px;
}
.scn-panel-head h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  color: var(--scn-fg);
}
.scn-panel-sub {
  margin: 4px 0 0;
  color: var(--scn-muted);
  font-size: 13px;
}

/* ---------- preset cards ---------- */
.scn-presets {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.scn-card {
  background: var(--scn-bg);
  border: 1px solid var(--scn-border);
  border-radius: var(--scn-radius);
  box-shadow: var(--scn-shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.18s ease;
}
.scn-card:hover {
  box-shadow: var(--scn-shadow-md);
}

.scn-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--scn-border);
  background: var(--scn-section-bg);
}
.scn-card-head h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}
.scn-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--scn-radius-sm);
  background: var(--scn-accent-light);
  color: var(--scn-accent);
  flex: 0 0 auto;
}

.scn-body {
  padding: 16px;
}
.scn-lede {
  margin: 0 0 14px;
  color: var(--scn-muted);
  font-size: 13px;
}
.scn-note {
  margin: 10px 0 0;
  color: var(--scn-muted);
  font-size: 12.5px;
}
.scn-subhead {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--scn-muted);
  margin-bottom: 8px;
}
.scn-muted {
  color: var(--scn-muted);
}
.scn-spacer {
  flex: 1 1 auto;
}

/* ============================ Showdown ============================ */
.scn-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.scn-col {
  border: 1px solid var(--scn-border);
  border-radius: var(--scn-radius-sm);
  padding: 14px;
  background: var(--scn-bg);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}
.scn-col.is-current {
  background: var(--scn-section-bg);
}
.scn-col.is-cheapest {
  border-color: var(--scn-success-border);
  box-shadow: 0 0 0 1px var(--scn-success-border) inset;
}

.scn-col-head {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 22px;
}
.scn-col-title {
  font-weight: 700;
  font-size: 14px;
}
.scn-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 999px;
  white-space: nowrap;
}
.scn-badge-best {
  background: var(--scn-success-light);
  color: var(--scn-success);
}

.scn-col-price {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--scn-fg);
}
.scn-col.is-cheapest .scn-col-price {
  color: var(--scn-success);
}

.scn-stats {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 10px;
  font-size: 12.5px;
}
.scn-stats dt {
  color: var(--scn-muted);
  white-space: nowrap;
}
.scn-stats dd {
  margin: 0;
  text-align: right;
  font-weight: 600;
}

.scn-pick {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid var(--scn-border);
  border-radius: var(--scn-radius-sm);
  background: var(--scn-bg);
  color: var(--scn-accent);
  font-weight: 600;
  font-size: 12.5px;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.scn-pick:hover {
  background: var(--scn-accent-light);
  border-color: var(--scn-accent);
}

/* ============================ Growth ============================ */
.scn-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 8px 0 16px;
}
.scn-step-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--scn-border);
  background: var(--scn-bg);
  color: var(--scn-accent);
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}
.scn-step-btn:hover {
  background: var(--scn-accent-light);
  border-color: var(--scn-accent);
}
.scn-step-btn:active {
  transform: scale(0.94);
}
.scn-step-val {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 96px;
}
.scn-step-num {
  font-size: 26px;
  font-weight: 800;
  color: var(--scn-accent);
  line-height: 1.1;
}
.scn-step-label {
  font-size: 12px;
  color: var(--scn-muted);
}

.scn-growth-outcome {
  border: 1px solid var(--scn-border);
  border-radius: var(--scn-radius-sm);
  background: var(--scn-section-bg);
  padding: 12px 14px;
}
.scn-growth-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 5px 0;
  font-size: 13px;
  border-bottom: 1px dashed var(--scn-border);
}
.scn-growth-row:last-of-type {
  border-bottom: none;
}
.scn-growth-k {
  color: var(--scn-muted);
}
.scn-growth-v {
  font-weight: 700;
  text-align: right;
}

.scn-tip {
  margin: 10px 0 0;
  font-size: 12.5px;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: var(--scn-radius-sm);
}
.scn-tip-ok {
  background: var(--scn-success-light);
  color: var(--scn-success);
}
.scn-tip-warn {
  background: var(--scn-warning-light);
  color: var(--scn-warning);
}

.scn-delta-up {
  color: var(--scn-warning);
}
.scn-delta-down {
  color: var(--scn-success);
}
.scn-delta-zero {
  color: var(--scn-muted);
}

/* headroom meters */
.scn-hr {
  margin-top: 14px;
}
.scn-hr-item {
  margin-bottom: 8px;
}
.scn-hr-top {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  margin-bottom: 3px;
}
.scn-meter {
  height: 7px;
  border-radius: 999px;
  background: var(--scn-border);
  overflow: hidden;
}
.scn-meter-fill {
  height: 100%;
  background: var(--scn-accent);
  border-radius: 999px;
  transition: width 0.3s ease;
}
.scn-meter-fill.tight {
  background: var(--scn-warning);
}
.scn-meter-fill.full {
  background: var(--scn-success);
}

/* ====================== Comparison tray ====================== */
.scn-tray {
  margin-top: 18px;
  border: 1px solid var(--scn-border);
  border-radius: var(--scn-radius);
  background: var(--scn-bg);
  box-shadow: var(--scn-shadow-sm);
  padding: 14px 16px;
}
.scn-tray-head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.scn-tray-head h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}
.scn-tray-empty {
  margin: 10px 0 0;
  color: var(--scn-muted);
  font-size: 13px;
}
.scn-link {
  border: none;
  background: none;
  color: var(--scn-accent);
  font-weight: 600;
  font-size: 12.5px;
  padding: 4px 6px;
  border-radius: var(--scn-radius-sm);
}
.scn-link:hover {
  background: var(--scn-accent-light);
}

.scn-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}
.scn-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px 6px 6px;
  border: 1px solid var(--scn-border);
  border-radius: 999px;
  background: var(--scn-section-bg);
  font-size: 12.5px;
}
.scn-chip-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 11px;
  color: #fff;
  background: var(--scn-accent);
}
.scn-chip-b .scn-chip-letter {
  background: var(--scn-success);
}
.scn-chip-c .scn-chip-letter {
  background: var(--scn-warning);
}
.scn-chip-label {
  font-weight: 600;
}
.scn-chip-total {
  color: var(--scn-muted);
}
.scn-chip-x {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--scn-muted);
}
.scn-chip-x:hover {
  background: var(--scn-border);
  color: var(--scn-fg);
}

.scn-diffs {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.scn-diff-block {
  border: 1px solid var(--scn-border);
  border-radius: var(--scn-radius-sm);
  overflow: hidden;
}
.scn-diff-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--scn-section-bg);
  font-weight: 700;
  font-size: 13px;
  border-bottom: 1px solid var(--scn-border);
}
.scn-diff-delta {
  font-weight: 800;
}

.scn-diff {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
}
.scn-diff th,
.scn-diff td {
  padding: 6px 10px;
  text-align: left;
  border-bottom: 1px solid var(--scn-border);
  vertical-align: top;
}
.scn-diff thead th {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--scn-muted);
  font-weight: 700;
  background: var(--scn-bg);
}
.scn-th-num,
.scn-td-num {
  text-align: right;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.scn-diff-cat td {
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--scn-muted);
  background: var(--scn-section-bg);
}
.scn-td-item {
  font-weight: 600;
}
.scn-sku {
  display: inline-block;
  margin-left: 6px;
  font-weight: 500;
  font-size: 11px;
  color: var(--scn-muted);
}
.scn-diff-empty {
  color: var(--scn-muted);
  text-align: center;
  padding: 14px;
}

/* diff row status colouring */
.scn-row-added {
  background: var(--scn-success-light);
}
.scn-row-added .scn-td-item {
  color: var(--scn-success);
}
.scn-row-removed {
  color: var(--scn-muted);
  text-decoration: line-through;
  text-decoration-color: rgba(107, 114, 128, 0.5);
}
.scn-row-changed {
  background: var(--scn-warning-light);
}
.scn-row-changed .scn-td-item {
  color: var(--scn-warning);
}

/* ---------- responsive: stack on narrow screens ---------- */
@media (max-width: 560px) {
  .scn-cols {
    grid-template-columns: 1fr;
  }
  .scn-diff th,
  .scn-diff td {
    padding: 6px;
  }
}