/* ==========================================================================
   DELTA — Shared UI primitives
   Buttons, badges, chips, cards, form fields. Used by kit and demo pages.
   Page-specific variations live in assets/css/pages/<page>.css.
   Depends on: tokens.css
   ========================================================================== */

/* Buttons ----------------------------------------------------------------
   <a class="btn btn--primary" href="…">Start free</a>
   Sizes:    btn--sm · (default) · btn--lg
   Variants: btn--primary · btn--secondary · btn--dark · btn--on-inverse
   ------------------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 14px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: none;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
}

.btn:hover {
  color: inherit;
}

.btn--sm {
  min-height: 36px;
  padding: 6px 14px;
  font-size: 13px;
}

.btn--lg {
  min-height: 52px;
  padding: 16px 26px;
  font-size: 17px;
}

.btn--block {
  display: flex;
  width: 100%;
}

/* One magenta action per viewport */
.btn--primary {
  background: var(--action);
  color: var(--on-action);
}
.btn--primary:hover {
  background: var(--action-hover);
  color: var(--on-action);
}

.btn--secondary {
  border-color: var(--line-2);
  background: var(--surface);
  color: var(--ink);
}
.btn--secondary:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.btn--dark {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--canvas);
}
.btn--dark:hover {
  color: var(--canvas);
}

/* Outline button on dark (inverse) panels */
.btn--on-inverse {
  border-color: color-mix(in oklab, var(--on-inverse) 40%, transparent);
  color: var(--on-inverse);
}
.btn--on-inverse:hover {
  color: var(--on-inverse);
}

/* Text-only button (underlined link look) */
.btn-link {
  padding: 0;
  border: 0;
  background: none;
  color: var(--ink);
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}

/* Badges -----------------------------------------------------------------
   Mono pill for status, versions and deltas.
   <span class="badge badge--pos">Δ +38%</span>
   ------------------------------------------------------------------------ */
.badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.55;
  white-space: nowrap;
}

.badge--xs {
  padding: 2px 8px;
  font-size: 11px;
}

.badge--md {
  padding: 4px 10px;
  font-size: 13px;
}

.badge--outline { border: 1px solid var(--line-2); }
.badge--pos     { background: var(--pos-bg);  color: var(--pos); }
.badge--neg     { background: var(--neg-bg);  color: var(--neg); }
.badge--warn    { background: var(--warn-bg); color: var(--warn); }
.badge--info    { background: var(--info-bg); color: var(--info); }
.badge--action  { background: var(--action-tint); color: var(--ink); border: 1px solid var(--line); }
.badge--inverse { background: var(--inverse); color: var(--on-inverse); }

/* Version tag — squarer mono tag, e.g. "v2.14" */
.tag {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--line-2);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: nowrap;
}

/* Chips ------------------------------------------------------------------
   Small toggle buttons (filters, segmented options).
   State via aria-pressed="true" or aria-selected="true".
   ------------------------------------------------------------------------ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  padding: 4px 12px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font-size: 12px;
  white-space: nowrap;
  cursor: pointer;
}

.chip[aria-pressed="true"],
.chip[aria-selected="true"] {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--canvas);
}

/* Segmented control ------------------------------------------------------
   <div class="segmented" role="tablist">
     <button class="segmented__option" aria-selected="true">Monthly</button>
   ------------------------------------------------------------------------ */
.segmented {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
}

.segmented__option {
  min-height: 32px;
  padding: 6px 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
}

.segmented__option[aria-selected="true"],
.segmented__option[aria-pressed="true"] {
  background: var(--ink);
  color: var(--canvas);
}

/* Cards ------------------------------------------------------------------ */
.card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}

.card--lg {
  padding: 24px;
  border-radius: var(--r-lg);
}

/* Form fields ------------------------------------------------------------ */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field__label {
  font-size: 14px;
  font-weight: 600;
}

.field__hint {
  font-size: 13px;
  color: var(--ink-3);
}

.input {
  width: 100%;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  background: var(--canvas);
  color: var(--ink);
}

/* Status dot ------------------------------------------------------------- */
.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pos);
}