/* ============================================================================
   datestool — components.css
   All reusable components. References semantic and component tokens only.
   ============================================================================ */

/* -------- Navigation ------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--nav-height);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  display: flex;
  align-items: center;
  padding: 0 var(--layout-page-gutter);
  transition: background-color var(--duration-normal) var(--ease),
              border-color var(--duration-normal) var(--ease);
}

@media (min-width: 1024px) {
  .nav {
    padding: 0 var(--layout-page-gutter-lg);
  }
}

.nav-inner {
  width: 100%;
  max-width: var(--layout-content-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.wordmark {
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-tight);
  text-decoration: none;
  line-height: 1;
  display: inline-flex;
}

.wordmark-name { color: var(--color-text-primary); }
.wordmark-tool { color: var(--color-text-secondary); }
.wordmark-tld  { color: var(--color-accent); }

/* -------- Buttons ---------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  height: var(--btn-primary-height);
  border-radius: var(--btn-primary-radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease),
              border-color     var(--duration-fast) var(--ease),
              color            var(--duration-fast) var(--ease);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}
.btn:focus-visible {
  outline: none;
  box-shadow: var(--input-focus-ring);
  border-color: var(--color-accent);
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  padding: 0 var(--btn-primary-padding-x);
}
.btn-primary:hover { background: var(--btn-primary-bg-hover); }

.btn-icon {
  width: var(--btn-icon-size);
  height: var(--btn-icon-size);
  border-radius: var(--btn-icon-radius);
  background: transparent;
  color: var(--btn-icon-color);
  border: none;
  padding: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--duration-fast) var(--ease),
              color            var(--duration-fast) var(--ease);
  flex-shrink: 0;
}
.btn-icon:hover { background: var(--btn-icon-bg-hover); color: var(--color-text-primary); }
.btn-icon:focus-visible { outline: none; box-shadow: var(--input-focus-ring); }

/* -------- Inputs ----------------------------------------------------------- */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field-label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
}

.field-caption {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  min-height: 1.2em;
}

.input {
  height: var(--input-height);
  background: var(--input-bg);
  color: var(--input-text);
  border: 1px solid var(--input-border);
  border-radius: var(--input-radius);
  padding: 0 var(--input-padding-x);
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: var(--leading-normal);
  transition: border-color var(--duration-fast) var(--ease),
              box-shadow   var(--duration-fast) var(--ease);
  width: 100%;
  box-sizing: border-box;
}
.input::placeholder { color: var(--input-placeholder); }
.input:hover { border-color: var(--color-border-strong); }
.input:focus,
.input:focus-visible {
  outline: none;
  border-color: var(--input-border-focus);
  box-shadow: var(--input-focus-ring);
}
.input[aria-invalid="true"] {
  border-color: var(--input-border-error);
}

/* Native date-input: remove browser appearance override so our bg wins */
.input[type="date"] {
  appearance: none;
  -webkit-appearance: none;
}
.input[type="date"]::-webkit-calendar-picker-indicator {
  opacity: 0.55;
  cursor: pointer;
}

/* Dark mode: invert the calendar picker glyph for visibility */
[data-theme="dark"] .input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(1);
  opacity: 0.75;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    opacity: 0.75;
  }
}

/* Dark mode: lift placeholder colour for legibility on grey-600 input bg */
[data-theme="dark"] .input::placeholder { color: var(--grey-300); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .input::placeholder { color: var(--grey-300); }
}

.input-with-icon {
  position: relative;
}
.input-with-icon .input { padding-left: 42px; }
.input-with-icon .icon-leading {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-secondary);
  pointer-events: none;
  width: 18px;
  height: 18px;
}

/* -------- Toggle ----------------------------------------------------------- */

.toggle {
  position: relative;
  display: inline-block;
  width: var(--toggle-width);
  height: var(--toggle-height);
  flex-shrink: 0;
}
.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}
.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--toggle-bg-off);
  border-radius: var(--toggle-radius);
  transition: background-color var(--toggle-duration) var(--ease);
  cursor: pointer;
}
.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: var(--toggle-thumb-size);
  height: var(--toggle-thumb-size);
  background: var(--toggle-thumb-bg);
  border-radius: var(--toggle-radius);
  transition: transform var(--toggle-duration) var(--ease);
}
.toggle input:checked + .toggle-track { background: var(--toggle-bg-on); }
.toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(calc(var(--toggle-width) - var(--toggle-thumb-size) - 6px));
}
.toggle input:focus-visible + .toggle-track {
  box-shadow: var(--input-focus-ring);
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.toggle-row label.t-label { cursor: pointer; }

/* Toggle row inside calc card gets a top divider */
.calc-card .toggle-row {
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border-subtle);
}

/* -------- Segmented control ----------------------------------------------- */

.segmented {
  display: inline-flex;
  background: var(--segment-bg);
  border: 1px solid var(--segment-border);
  border-radius: var(--segment-radius);
  padding: 3px;
  gap: 2px;
}
.segmented-item {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--segment-item-text);
  background: transparent;
  border: none;
  padding: 6px 14px;
  border-radius: var(--segment-item-radius);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease),
              color            var(--duration-fast) var(--ease),
              box-shadow       var(--duration-fast) var(--ease);
  min-height: 32px;
}
.segmented-item[aria-pressed="true"] {
  background: var(--segment-item-bg-active);
  color: var(--segment-item-text-active);
  box-shadow: var(--segment-item-shadow-active);
}
.segmented-item:focus-visible {
  outline: none;
  box-shadow: var(--input-focus-ring);
}

/* Dark mode: track and active-item colours collide — fix with inset hairline */
[data-theme="dark"] .segmented { --segment-bg: var(--grey-700); }
[data-theme="dark"] .segmented-item[aria-pressed="true"] {
  box-shadow: inset 0 0 0 1px var(--color-border-strong), var(--segment-item-shadow-active);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .segmented { --segment-bg: var(--grey-700); }
  :root:not([data-theme="light"]) .segmented-item[aria-pressed="true"] {
    box-shadow: inset 0 0 0 1px var(--color-border-strong), var(--segment-item-shadow-active);
  }
}

/* -------- Calculator card -------------------------------------------------- */

.calc-card {
  background: var(--calc-bg);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius);
  box-shadow: var(--shadow-sm);
  padding: var(--calc-padding);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  width: 100%;
  box-sizing: border-box;
  transition: background-color var(--duration-normal) var(--ease),
              border-color     var(--duration-normal) var(--ease);
}

/* -------- Result card ------------------------------------------------------ */

.result-card {
  background: var(--result-bg);
  border: 1px solid var(--result-border);
  border-radius: var(--result-radius);
  box-shadow: var(--result-shadow);
  padding: var(--result-padding);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  transition: background-color var(--duration-normal) var(--ease),
              border-color     var(--duration-normal) var(--ease);
}

/* Empty state — light mode: subtle tokens; dark mode: dark primitives */
.result-empty {
  background: var(--color-bg-subtle);
  border: 1.5px dashed var(--color-border-default);
  color: var(--color-text-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  font-size: var(--text-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}
.result-empty .result-empty-icon {
  width: 28px;
  height: 28px;
  color: var(--color-text-secondary);
}

[data-theme="dark"] .result-empty {
  background: var(--grey-700);
  border-color: var(--grey-500);
  color: var(--grey-200);
}
[data-theme="dark"] .result-empty .result-empty-icon {
  color: var(--grey-200);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .result-empty {
    background: var(--grey-700);
    border-color: var(--grey-500);
    color: var(--grey-200);
  }
  :root:not([data-theme="light"]) .result-empty .result-empty-icon {
    color: var(--grey-200);
  }
}

.result-hero-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.result-hero-num {
  font-size: var(--text-result);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--result-hero-color);
  font-variant-numeric: tabular-nums;
}

.result-hero-label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--result-label-color);
  margin-top: 4px;
}

.result-breakdown {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--result-divider);
}

/* Breakdown numbers: quiet supporting detail, subordinate to the hero */
.result-breakdown-num {
  font-size: var(--text-md);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-tight);
  color: var(--result-hero-color);
  font-variant-numeric: tabular-nums;
  line-height: var(--leading-snug);
}

.result-breakdown-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--result-label-color);
  margin-top: 4px;
}

/* Error result variant */
.result-card.is-error {
  background: var(--color-error-bg);
  border-color: var(--color-error);
}

/* Result note — used for informational callouts inside the result card */
.result-card .result-note {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-base);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-md);
  color: var(--color-error-text);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: var(--leading-snug);
}
.result-card .result-note .icon {
  color: var(--color-error);
  flex: 0 0 auto;
  margin-top: 1px;
}

/* Informational variant — neutral colours for non-error callouts */
.result-card .result-note.result-note--info {
  background: var(--color-bg-subtle);
  border-color: var(--color-border-default);
  color: var(--color-text-secondary);
}
.result-card .result-note.result-note--info .icon {
  color: var(--color-text-tertiary);
}

/* -------- Icons ------------------------------------------------------------ */

.icon {
  width: 20px;
  height: 20px;
  display: inline-block;
  vertical-align: middle;
  color: currentColor;
  flex-shrink: 0;
}
.icon-sm { width: 16px; height: 16px; }

/* -------- Page scaffold ---------------------------------------------------- */

.page {
  width: 100%;
  box-sizing: border-box;
  padding: var(--space-8) var(--layout-page-gutter) 0;
}

@media (min-width: 1024px) {
  .page {
    padding: var(--space-12) var(--layout-page-gutter-lg) 0;
  }
}

.page-inner {
  max-width: var(--layout-content-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.page-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* -------- Two-column date input grid -------------------------------------- */

.calc-grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .calc-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* -------- Date field row: input + Today button ---------------------------- */

.date-field-row {
  display: flex;
  align-items: stretch;
  gap: var(--space-2);
}
.date-field-row .input-with-icon { flex: 1 1 auto; min-width: 0; }

.btn-today {
  flex: 0 0 auto;
  height: var(--input-height);
  padding: 0 var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  background: var(--btn-ghost-bg);
  color: var(--btn-ghost-text);
  border: 1px solid var(--btn-ghost-border);
  border-radius: var(--input-radius);
  cursor: pointer;
  font-family: var(--font-sans);
  white-space: nowrap;
  transition: background-color var(--duration-fast) var(--ease),
              border-color     var(--duration-fast) var(--ease);
}
.btn-today:hover {
  background: var(--btn-ghost-bg-hover);
  border-color: var(--btn-ghost-border-hover);
}
.btn-today:focus-visible {
  outline: none;
  box-shadow: var(--input-focus-ring);
}

/* -------- Below-fold copy sections --------------------------------------- */

.below-fold {
  max-width: var(--layout-reading-width);
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  padding-top: var(--space-4);
}

.below-fold-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.below-fold-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.below-fold-list li {
  display: flex;
  gap: var(--space-3);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
}
.below-fold-list li::before {
  content: "·";
  color: var(--color-text-tertiary);
  font-weight: var(--weight-semibold);
  flex-shrink: 0;
}

/* -------- Footer ---------------------------------------------------------- */

.footer {
  background: var(--footer-bg);
  border-top: 1px solid var(--footer-border);
  padding: var(--space-8) var(--layout-page-gutter);
  margin-top: var(--space-16);
  transition: background-color var(--duration-normal) var(--ease),
              border-color     var(--duration-normal) var(--ease);
}

@media (min-width: 1024px) {
  .footer {
    padding: var(--space-8) var(--layout-page-gutter-lg);
  }
}

/* Dark mode: footer background lifts to page base so it reads as a plinth */
[data-theme="dark"] .footer { background: var(--grey-900); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .footer { background: var(--grey-900); }
}

.footer-inner {
  max-width: var(--layout-content-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-3) var(--space-6);
  color: var(--footer-text);
  font-size: var(--text-xs);
  line-height: var(--leading-snug);
}

/* Mobile: stack centred.
   Selectors use .footer-inner .foo (specificity 0,2,0) so they win over the
   base .foo rules (0,1,0) that appear later in the file. */
@media (max-width: 639px) {
  .footer-inner {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: var(--space-3);
  }
  .footer-inner .footer-links,
  .footer-inner .footer-copy {
    grid-column: 1;
    justify-self: center;
  }
  .footer-inner .footer-links {
    justify-content: center;
  }
  .footer-inner .footer-disclaimer {
    justify-self: stretch;
    text-align: center;
    max-width: none;
    margin-left: 0;
    margin-right: 0;
  }
}

.footer-links {
  grid-column: 1;
  justify-self: start;
  display: flex;
  gap: var(--space-4);
  align-items: center;
  flex-wrap: wrap;
}

.footer-copy {
  grid-column: 2;
  justify-self: end;
}

.footer-link {
  color: var(--footer-link);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease);
}
.footer-link:hover { color: var(--footer-link-hover); }

.footer-sep { color: var(--color-text-tertiary); }

/* Calculator pages only: disclaimer on its own row beneath links + copyright */
.footer-disclaimer {
  grid-column: 1 / -1;
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  line-height: var(--leading-snug);
  margin: var(--space-4) 0 0;
  text-align: center;
}