/* =========================================================================
   Storm Drainage Toolkit — page-specific styles
   Extends assets/css/styles.css (the shared NBDF design system).
   Loaded AFTER styles.css. Keeps the default ember accent (no :root
   override — unlike excavator-wind-run.css, which re-themes to blue).

   The .nbdf- calculator components below intentionally match
   pipeline-calc.css so the two engineering suites read as one system;
   each page keeps its own copy per the style guide's page-scoped-CSS rule.
   ========================================================================= */

/* -------------------------------------------------------------------------
   Rail extras: "back to foundry" link (same pattern as the game page)
   ------------------------------------------------------------------------- */

.rail__home {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--accent);
  padding: 2px 0;
}
.rail__home:hover { text-decoration: underline; }

/* -------------------------------------------------------------------------
   Workflow stack: one column of calculator panels per section
   ------------------------------------------------------------------------- */

.nbdf-workflow {
  display: grid;
  gap: 18px;
}

/* -------------------------------------------------------------------------
   Calculator panel (mirrors the .panel pattern)
   ------------------------------------------------------------------------- */

.nbdf-calc {
  border: 2px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface);
  padding: 20px 22px;
}

.nbdf-calc__title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.014em;
  margin: 0 0 4px;
}

.nbdf-calc__sub {
  font-size: 13px;
  line-height: 1.45;
  color: var(--muted);
  margin: 0;
}

.nbdf-calc__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 20px;
  margin-top: 16px;
  align-items: start;
}

/* -------------------------------------------------------------------------
   Input fields
   ------------------------------------------------------------------------- */

.nbdf-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 13px 14px;
  align-content: start;
}

.nbdf-field--wide { grid-column: 1 / -1; }

.nbdf-field__label {
  display: block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 5px;
}

.nbdf-field__unit {
  text-transform: none;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.nbdf-field__input,
.nbdf-field__select {
  display: block;
  width: 100%;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.006em;
  font-feature-settings: 'tnum' 1, 'zero' 1, 'cv05' 1;
  color: var(--ink);
  background: var(--surface);
  border: 2px solid var(--dash);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  transition: border-color 0.12s ease;
}

.nbdf-field__input::placeholder { color: var(--faint); font-weight: 400; }
.nbdf-field__input:hover,
.nbdf-field__select:hover { border-color: var(--muted); }
.nbdf-field__input:focus,
.nbdf-field__select:focus { border-color: var(--ink); }

.nbdf-field__input[aria-invalid="true"] { border-color: var(--accent); }

/* Hide native number spinners; values are typed, not stepped */
.nbdf-field__input::-webkit-outer-spin-button,
.nbdf-field__input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.nbdf-field__input[type="number"] { -moz-appearance: textfield; appearance: textfield; }

.nbdf-field__error {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--accent);
  margin: 5px 0 0;
}

/* -------------------------------------------------------------------------
   Results: bordered readout stack (mirrors the .stat matrix pattern)
   ------------------------------------------------------------------------- */

.nbdf-results {
  border: 2px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface-alt);
  overflow: hidden;
}

.nbdf-readout {
  padding: 13px 16px;
  border-bottom: 1.5px solid var(--line);
}
.nbdf-readout:last-child { border-bottom: 0; }

.nbdf-readout__label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 6px;
}

.nbdf-readout__value {
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  margin: 0;
  font-feature-settings: 'tnum' 1, 'zero' 1;
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}
.nbdf-readout__value small {
  font-size: 0.5em;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0;
}

/* Compliance chip (mirrors the .tag pill pattern) */
.nbdf-chip {
  display: inline-flex;
  align-items: center;
  border: 2px solid var(--line-strong);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--surface);
  color: var(--ink);
}
.nbdf-chip--ok      { border-color: var(--line-strong); }
.nbdf-chip--info    { border-color: var(--dash); color: var(--muted); }
.nbdf-chip--review  { border-color: var(--accent); color: var(--accent); }
.nbdf-chip--exceeds { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); }

.nbdf-readout__note {
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
  margin: 6px 0 0;
}

/* -------------------------------------------------------------------------
   Method & References (native <details> — zero-JS collapsible)
   ------------------------------------------------------------------------- */

.nbdf-refs {
  margin-top: 16px;
  border-top: 1.5px solid var(--line);
  padding-top: 12px;
}

.nbdf-refs > summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint);
}
.nbdf-refs > summary::-webkit-details-marker { display: none; }
.nbdf-refs > summary::before {
  content: '+';
  font-weight: 800;
  font-size: 13px;
  line-height: 1;
  color: var(--accent);
}
.nbdf-refs[open] > summary::before { content: '−'; }
.nbdf-refs > summary:hover { color: var(--ink); }

.nbdf-refs__body {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  max-width: 72ch;
}
.nbdf-refs__body p { margin: 0 0 10px; }
.nbdf-refs__body ul { margin: 0 0 10px; padding-left: 18px; }
.nbdf-refs__body li { margin-bottom: 4px; }
.nbdf-refs__body strong { color: var(--ink); }

/* Equation block */
.nbdf-eq {
  display: block;
  background: var(--surface-tint);
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--ink);
  font-feature-settings: 'tnum' 1, 'zero' 1, 'cv05' 1;
  overflow-x: auto;
  white-space: pre;
}

/* Small reference tables (runoff C values, HDS-5 coefficients, …) */
.nbdf-refs__body table {
  border-collapse: collapse;
  margin: 0 0 10px;
  font-size: 12px;
  font-feature-settings: 'tnum' 1, 'zero' 1;
}
.nbdf-refs__body th,
.nbdf-refs__body td {
  text-align: left;
  padding: 4px 14px 4px 0;
  border-bottom: 1.5px solid var(--line);
  color: var(--muted);
}
.nbdf-refs__body th {
  color: var(--faint);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 10px;
}

/* -------------------------------------------------------------------------
   Engineering disclaimer strip
   ------------------------------------------------------------------------- */

.nbdf-disclaimer { background: var(--surface-alt); }

.nbdf-disclaimer__text {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  max-width: 72ch;
  margin: 0;
}

/* -------------------------------------------------------------------------
   Responsive — same breakpoints as the shared system (860 / 760 / 540)
   ------------------------------------------------------------------------- */

@media (max-width: 860px) {
  .nbdf-calc__grid { grid-template-columns: 1fr; }
}

@media (max-width: 540px) {
  .nbdf-form { grid-template-columns: 1fr; }
  .nbdf-calc { padding: 16px; }
}