/* ==========================================================================
   USFinCalc — Components (1/2): nav, footer, ad slots, buttons
   Loaded after base.css. Mobile-first.
   ========================================================================== */

/* ==========================================================================
   Sticky nav
   ========================================================================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.site-nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.site-nav__brand {
  font-weight: var(--fw-bold);
  font-size: var(--fs-md);
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.site-nav__brand b { color: var(--color-primary); }

.site-nav__toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.site-nav__toggle svg { width: 22px; height: 22px; }

.site-nav__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Mobile: collapsible panel */
@media (max-width: 767px) {
  .site-nav__links {
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: none;
    flex-direction: column;
    padding: var(--space-2) var(--space-4) var(--space-4);
  }
  .site-nav__links[data-open="true"] { display: flex; }
  .site-nav__links a {
    display: block;
    padding: var(--space-3) var(--space-2);
    min-height: 44px;
    text-decoration: none;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
  }
  .site-nav__links li:last-child a { border-bottom: none; }
}

/* Desktop: inline */
@media (min-width: 768px) {
  .site-nav__toggle { display: none; }
  .site-nav__links {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--space-5);
  }
  .site-nav__links a {
    text-decoration: none;
    color: var(--color-muted);
    font-weight: var(--fw-medium);
    font-size: var(--fs-sm);
  }
  .site-nav__links a:hover,
  .site-nav__links a[aria-current="page"] { color: var(--color-primary); }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  flex-shrink: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-6);
  margin-top: var(--space-7);
  font-size: var(--fs-sm);
  color: var(--color-muted);
}
.site-footer__grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .site-footer__grid { grid-template-columns: repeat(3, 1fr); }
}
.site-footer h4 {
  font-size: var(--fs-sm);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.site-footer ul { list-style: none; padding: 0; }
.site-footer a { color: var(--color-muted); text-decoration: none; }
.site-footer a:hover { color: var(--color-primary); }
.site-footer__disclaimer {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-xs);
  line-height: var(--lh-snug);
}

/* ==========================================================================
   Ad slots — reserved height to protect CLS (< 0.05)
   ========================================================================== */
.ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  background: var(--color-surface-2);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  /* "Advertisement" label requirement met via ::before */
}
.ad-slot::before {
  content: "Advertisement";
  position: absolute;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  opacity: 0.7;
}
.ad-slot ins { position: relative; z-index: 1; }
.ad-slot--banner { min-height: var(--ad-slot-banner); }
.ad-slot--rect   { min-height: var(--ad-slot-rect); }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-base);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, transform 0.05s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-on-primary);
}
.btn--primary:hover { background: var(--color-primary-hover); color: var(--color-text-on-primary); }
.btn--ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--block { width: 100%; }

/* ==========================================================================
   Components (2/2): calculator card, forms, results, related cards
   ========================================================================== */

/* ---- Calculator card: inputs left / results right, stack on mobile ---- */
.calc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.calc__grid {
  display: grid;
  grid-template-columns: 1fr;          /* mobile: stacked */
  gap: 0;
}
@media (min-width: 880px) {
  .calc__grid { grid-template-columns: 1.1fr 0.9fr; }  /* desktop: side by side */
}
.calc__inputs  { padding: var(--space-5); }
.calc__results {
  padding: var(--space-5);
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-border);
}
@media (min-width: 880px) {
  .calc__results { border-top: none; border-left: 1px solid var(--color-border); }
}

/* ---- Form fields ---- */
.field { margin-bottom: var(--space-4); }
.field > label {
  display: block;
  font-weight: var(--fw-medium);
  font-size: var(--fs-sm);
  margin-bottom: var(--space-1);
}
.field__hint { display: block; font-size: var(--fs-xs); color: var(--color-muted); margin-top: var(--space-1); }

.input-wrap { position: relative; display: flex; align-items: center; }
.input-wrap__affix {
  position: absolute;
  color: var(--color-muted);
  font-size: var(--fs-base);
  pointer-events: none;
}
.input-wrap__affix--prefix { left: var(--space-3); }
.input-wrap__affix--suffix { right: var(--space-3); }

.input,
select.input {
  width: 100%;
  min-height: 44px;                    /* touch target */
  padding: var(--space-3);
  font-size: var(--fs-base);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  appearance: none;
}
.input:focus { border-color: var(--color-primary); }
.input-wrap--prefix .input { padding-left: calc(var(--space-3) + 1ch); }
.input-wrap--suffix .input { padding-right: calc(var(--space-5) + 1ch); }
.input[aria-invalid="true"] { border-color: var(--color-warning); }
.field__error { display: none; color: var(--color-warning); font-size: var(--fs-xs); margin-top: var(--space-1); }
.field[data-invalid="true"] .field__error { display: block; }

/* Range slider paired with number input */
.input-range { width: 100%; accent-color: var(--color-primary); height: 44px; }

/* ---- Results panel ---- */
.result {
  text-align: center;
  padding-block: var(--space-3);
}
.result__label {
  font-size: var(--fs-sm);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.result__figure {
  font-family: var(--font-figure);
  font-size: var(--fs-figure);
  line-height: var(--lh-tight);
  color: var(--color-accent);
  margin-top: var(--space-1);
}
.result__figure--cost { color: var(--color-text); }

/* Breakdown rows */
.breakdown { margin-top: var(--space-4); border-top: 1px solid var(--color-border); }
.breakdown__row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--fs-sm);
}
.breakdown__row dt { color: var(--color-muted); }
.breakdown__row dd { font-weight: var(--fw-semibold); font-variant-numeric: tabular-nums; }
.breakdown__row--total dt,
.breakdown__row--total dd { color: var(--color-text); font-weight: var(--fw-bold); }

.estimate-note {
  margin-top: var(--space-3);
  font-size: var(--fs-xs);
  color: var(--color-muted);
  text-align: center;
}

/* ---- Related calculators / guides cards ---- */
.cards {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}
@media (min-width: 560px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 880px) { .cards { grid-template-columns: repeat(3, 1fr); } }

.card {
  display: block;
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}
.card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}
.card__title { font-weight: var(--fw-semibold); font-size: var(--fs-md); }
.card__desc  { margin-top: var(--space-1); font-size: var(--fs-sm); color: var(--color-muted); }

/* ---- FAQ (details/summary) ---- */
.faq__item { border-bottom: 1px solid var(--color-border); }
.faq__item summary {
  cursor: pointer;
  padding: var(--space-4) 0;
  font-weight: var(--fw-semibold);
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 44px;
  align-items: center;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: "+"; color: var(--color-primary); font-size: var(--fs-lg); }
.faq__item[open] summary::after { content: "\2212"; }
.faq__item > div { padding-bottom: var(--space-4); color: var(--color-muted); }

/* ---- Breadcrumb ---- */
.breadcrumb {
  color: var(--color-muted);
  margin-bottom: var(--space-2);
}
.breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--color-primary); text-decoration: underline; }
.breadcrumb span { color: var(--color-text); }

/* ---- Consent banner ---- */
.consent {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -4px 16px rgba(15, 23, 42, 0.08);
  padding: var(--space-4) 0;
}
.consent__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: flex-start;
}
.consent__text {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--color-text);
}
.consent__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  width: 100%;
}
.consent__btn { min-height: 44px; }
@media (min-width: 720px) {
  .consent__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .consent__actions { width: auto; flex-shrink: 0; }
}

/* Link-styled button (e.g. footer "Cookie settings") */
.site-footer .link-btn {
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  color: var(--color-muted);
  cursor: pointer;
}
.site-footer .link-btn:hover { color: var(--color-primary); }