/* ============================================================
   .uk-toggle-pill — unified canonical toggle pills (loaded only on /docs/ui-kit)
   ============================================================
   Replaces two legacy declarations on /pricing:
     .pricing-toggle-pill + .toggle-slider + .toggle-btn + .save-badge
        (billing period: 2 options, flex auto-width)
     .frequency-pills + .freq-slider + .freq-pill
        (calculator frequency: 3-6 options, grid 3 columns × N rows)

   Slots:
     .uk-toggle-pill                       root container, owns the slider
       .uk-toggle-pill-slider              absolutely-positioned moving backdrop
       .uk-toggle-pill-option              one selectable button
         .uk-toggle-pill-savings           inline note chip ("Save 17%")

   Visual flavors (default first):
     --filled       (default) gradient slider, dark text on the active option,
                    card-bg container with a border. Replaces .pricing-toggle-pill.
     --outlined     transparent container, primary-tinted slider with a primary
                    border, primary-light text on the active option. Replaces
                    .frequency-pills.

   Layout:
     default        inline-flex, options auto-width.
     --grid         grid layout with --toggle-pill-cols columns (default 3).

   Sizes:
     default        font-md, padding 10px 24px (filled) / 10px 8px (outlined).
     --sm           font-sm, tighter padding.
     --lg           font-lg, roomier padding.

   JS contract (public/js/toggle-pills.js):
     - Auto-wires every .uk-toggle-pill on DOMContentLoaded.
     - Auto-creates the .uk-toggle-pill-slider if absent.
     - Click on an .uk-toggle-pill-option swaps .is-active between siblings,
       repositions the slider, and dispatches a 'toggle-pill:change' CustomEvent
       on the container with detail = { value, option, container }.
     - Repositions on window resize, font load, and container ResizeObserver.
     - The slider stays opacity 0 until the first measurement lands; we then set
       data-ready="true" on the container — that flips opacity to 1 without
       a flash of off-position highlight.
     - Respects prefers-reduced-motion (no transitions on the slider).
   ============================================================ */

/* ---------- Root container ---------- */
.uk-toggle-pill {
    position: relative;
    display: inline-flex;
    align-items: stretch;
    gap: 0;
    padding: 4px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    --toggle-pill-cols: 3;
}

.uk-toggle-pill.uk-toggle-pill--grid {
    display: grid;
    grid-template-columns: repeat(var(--toggle-pill-cols), 1fr);
    gap: 8px;
}

/* Outlined flavor — flat, no card chrome, options carry their own borders */
.uk-toggle-pill.uk-toggle-pill--outlined {
    background: transparent;
    border: none;
    padding: 0;
    border-radius: 0;
}

/* ---------- Slider (the moving backdrop) ---------- */
.uk-toggle-pill-slider {
    position: absolute;
    top: 4px;
    left: 4px;
    width: 0;
    height: calc(100% - 8px);
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    transition:
        top 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        left 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        width 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    z-index: 0;
    opacity: 0;
}

.uk-toggle-pill[data-ready="true"] .uk-toggle-pill-slider {
    opacity: 1;
}

.uk-toggle-pill--outlined .uk-toggle-pill-slider {
    top: 0;
    left: 0;
    height: auto;
    background: rgba(var(--color-primary-rgb), 0.15);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-lg);
}

/* ---------- Option (the clickable button) ---------- */
.uk-toggle-pill-option {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 24px;
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: var(--font-md);
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast), font-weight var(--transition-fast);
    white-space: nowrap;
    border-radius: var(--radius-full);
}

.uk-toggle-pill-option:hover {
    color: var(--color-text);
}

.uk-toggle-pill-option:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.uk-toggle-pill-option:active {
    transform: scale(0.98);
}

/* Active state — filled flavor: dark text on the gradient slider */
.uk-toggle-pill-option.is-active {
    color: #000;
    font-weight: 600;
}

/* Outlined flavor option — borders, no rounded-full, primary-light active text */
.uk-toggle-pill--outlined .uk-toggle-pill-option {
    padding: 10px 8px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-sm);
    text-align: center;
}

.uk-toggle-pill--outlined .uk-toggle-pill-option:hover {
    border-color: rgba(var(--color-primary-rgb), 0.4);
    color: var(--color-text);
}

.uk-toggle-pill--outlined .uk-toggle-pill-option.is-active {
    color: var(--color-primary-light);
    border-color: transparent;
    font-weight: 600;
}

/* ---------- Savings chip ---------- */
.uk-toggle-pill-savings {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(var(--color-success-rgb), 0.15);
    color: var(--color-success);
    font-size: var(--font-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: background var(--transition-fast), color var(--transition-fast);
}

/* When the parent option is active in the filled flavor, the chip flips to
   dark-on-white so it stays legible against the gradient slider */
.uk-toggle-pill:not(.uk-toggle-pill--outlined) .uk-toggle-pill-option.is-active .uk-toggle-pill-savings {
    background: rgba(0, 0, 0, 0.18);
    color: #000;
}

/* ---------- Sizes ---------- */
.uk-toggle-pill--sm .uk-toggle-pill-option {
    padding: 6px 16px;
    font-size: var(--font-sm);
}

.uk-toggle-pill--sm.uk-toggle-pill--outlined .uk-toggle-pill-option {
    padding: 6px 6px;
    font-size: var(--font-xs);
}

.uk-toggle-pill--lg .uk-toggle-pill-option {
    padding: 14px 32px;
    font-size: var(--font-lg);
}

.uk-toggle-pill--lg.uk-toggle-pill--outlined .uk-toggle-pill-option {
    padding: 14px 12px;
    font-size: var(--font-md);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    .uk-toggle-pill-slider {
        transition: none;
    }
    .uk-toggle-pill-option,
    .uk-toggle-pill-savings {
        transition: none;
    }
    .uk-toggle-pill-option:active {
        transform: none;
    }
}