/* ============================================================================
   PK DESIGN SYSTEM v1.0
   Architectural Brutalism — Monochrome Noir

   A rigid framework for high-contrast dark interfaces.
   Zero border-radius. Tonal surface layering. Editorial typography.

   Dependencies: Google Fonts (Bebas Neue, Space Grotesk, Inter, JetBrains Mono, Material Symbols)
   ============================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=JetBrains+Mono:wght@400;500;600;700&family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200&display=swap');

/* ============================================================================
   1. DESIGN TOKENS
   ============================================================================ */

:root {
    /* --- Surfaces (tonal hierarchy, darkest to brightest) --- */
    --pk-black: #000000;
    --pk-surface-lowest: #0e0e0e;
    --pk-surface: #131313;
    --pk-surface-low: #1b1b1b;
    --pk-surface-container: #1f1f1f;
    --pk-surface-high: #2a2a2a;
    --pk-surface-highest: #353535;
    --pk-surface-bright: #393939;

    /* --- Content colors --- */
    --pk-primary: #ffffff;
    --pk-primary-container: #d4d4d4;
    --pk-on-primary: #1a1c1c;
    --pk-on-surface: #e2e2e2;
    --pk-on-surface-variant: #c6c6c6;
    --pk-secondary: #c7c6c6;
    --pk-outline: #919191;
    --pk-outline-variant: #474747;

    /* --- Borders (subtle dividers, used across many components) --- */
    --pk-border-subtle: var(--pk-border-subtle);
    --pk-border-subtle-strong: var(--pk-border-subtle-strong);

    /* --- Accent colors (gentle, outlined — for semantic feedback ONLY) ---
       These are used ONLY as thin outlines, font color, or subtle left-borders.
       NEVER as full background fills. The UI stays monochrome;
       accents just whisper "error" / "success" / "warning". */
    --pk-accent-error: #b05050;        /* muted red — errors, failures */
    --pk-accent-success: #5a8a5a;      /* muted green — success confirmations */
    --pk-accent-warning: #a08a50;      /* muted yellow/amber — warnings, caution */

    /* --- Semantic shading (primary mechanism is still grayscale) --- */
    --pk-positive: #ffffff;
    --pk-positive-container: #353535;
    --pk-negative: #919191;
    --pk-negative-container: #1b1b1b;
    --pk-caution: #c6c6c6;
    --pk-caution-container: #2a2a2a;

    /* Backward-compat aliases */
    --pk-error: var(--pk-accent-error);
    --pk-error-container: var(--pk-negative-container);
    --pk-on-error: #000000;
    --pk-success: var(--pk-accent-success);
    --pk-success-container: var(--pk-positive-container);
    --pk-warning: var(--pk-accent-warning);
    --pk-warning-container: var(--pk-caution-container);

    /* --- Typography --- */
    --pk-font-display: 'Bebas Neue', sans-serif;
    --pk-font-headline: 'Space Grotesk', sans-serif;
    --pk-font-body: 'Inter', sans-serif;
    --pk-font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    /* --- Spacing scale --- */
    --pk-space-xs: 0.25rem;
    --pk-space-sm: 0.5rem;
    --pk-space-md: 1rem;
    --pk-space-lg: 1.5rem;
    --pk-space-xl: 2rem;
    --pk-space-2xl: 3rem;

    /* --- Radius (always zero) --- */
    --pk-radius: 0px;

    /* --- Transitions --- */
    --pk-ease-mechanical: cubic-bezier(0.2, 0, 0, 1);
    --pk-duration-fast: 200ms;
    --pk-duration-normal: 300ms;
    --pk-duration-slow: 500ms;

    /* --- Shadows (ambient only) --- */
    --pk-shadow-ambient: 0 0 40px rgba(0, 0, 0, 0.4);
    --pk-shadow-float: 0 4px 60px rgba(0, 0, 0, 0.6);

    /* --- Z-index scale --- */
    --pk-z-dropdown: 100;
    --pk-z-dialog-backdrop: 200;
    --pk-z-dialog: 210;
    --pk-z-tooltip: 300;
}


/* ============================================================================
   2. BASE / RESET
   ============================================================================ */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    color-scheme: dark;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--pk-font-body);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--pk-on-surface);
    background-color: var(--pk-surface);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: var(--pk-primary);
    color: var(--pk-on-primary);
}

/* Architectural scrollbar */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: var(--pk-surface-lowest); }
::-webkit-scrollbar-thumb { background: var(--pk-surface-highest); }
::-webkit-scrollbar-thumb:hover { background: var(--pk-outline-variant); }

a {
    color: var(--pk-primary);
    text-decoration: none;
    transition: color var(--pk-duration-fast) var(--pk-ease-mechanical);
}
a:hover { color: var(--pk-secondary); }

img { max-width: 100%; display: block; }

h1, h2, h3, h4, h5, h6 {
    font-family: var(--pk-font-headline);
    font-weight: 700;
    color: var(--pk-primary);
    line-height: 1.1;
}

/* Display heading (Bebas Neue) */
.pk-display {
    font-family: var(--pk-font-display);
    text-transform: uppercase;
    letter-spacing: -0.02em;
}

/* Label text */
.pk-label {
    font-family: var(--pk-font-body);
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--pk-outline);
}


/* ============================================================================
   3. LAYOUT UTILITIES
   ============================================================================ */

.pk-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--pk-space-lg);
}

.pk-grid {
    display: grid;
    gap: var(--pk-space-md);
}

.pk-flex { display: flex; }
.pk-flex-col { flex-direction: column; }
.pk-items-center { align-items: center; }
.pk-justify-between { justify-content: space-between; }
.pk-gap-sm { gap: var(--pk-space-sm); }
.pk-gap-md { gap: var(--pk-space-md); }
.pk-gap-lg { gap: var(--pk-space-lg); }

.pk-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive grid helpers */
@media (min-width: 640px) {
    .pk-grid-2 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 768px) {
    .pk-grid-3 { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
    .pk-grid-4 { grid-template-columns: repeat(4, 1fr); }
}
.pk-grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}


/* ============================================================================
   4. BUTTONS (.pk-btn)
   ============================================================================ */

.pk-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--pk-space-sm);
    padding: 0.625rem 1.25rem;
    font-family: var(--pk-font-headline);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border: 1px solid transparent;
    border-radius: var(--pk-radius);
    cursor: pointer;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.4;
    /* Default: secondary style */
    background: var(--pk-surface-high);
    color: var(--pk-on-surface);
    border-color: var(--pk-outline-variant);
}

.pk-btn:hover {
    background: var(--pk-surface-bright);
    color: var(--pk-primary);
}

.pk-btn:active {
    transform: scale(0.97);
}

.pk-btn:disabled, .pk-btn[disabled] {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

/* Primary (white bg, dark text) */
.pk-btn--primary {
    background: var(--pk-primary);
    color: var(--pk-on-primary);
    border-color: var(--pk-primary);
}
.pk-btn--primary:hover {
    background: var(--pk-primary-container);
    color: var(--pk-on-primary);
}

/* Negative / Danger — dark bg, muted text, gentle red outline */
.pk-btn--negative,
.pk-btn--danger {
    background: var(--pk-negative-container);
    color: var(--pk-on-surface-variant);
    border-color: var(--pk-accent-error);
}
.pk-btn--negative:hover,
.pk-btn--danger:hover {
    background: var(--pk-surface-highest);
    color: var(--pk-primary);
    border-color: var(--pk-accent-error);
}

/* Positive / Success — white bg, happy path (no green bg, just white) */
.pk-btn--positive,
.pk-btn--success {
    background: var(--pk-primary);
    color: var(--pk-on-primary);
    border-color: var(--pk-primary);
}
.pk-btn--positive:hover,
.pk-btn--success:hover {
    background: var(--pk-primary-container);
    color: var(--pk-on-primary);
}

/* Caution / Warning — dark bg, muted text, gentle amber outline */
.pk-btn--caution,
.pk-btn--warning {
    background: var(--pk-caution-container);
    color: var(--pk-on-surface-variant);
    border-color: var(--pk-accent-warning);
}
.pk-btn--caution:hover,
.pk-btn--warning:hover {
    background: var(--pk-surface-highest);
    color: var(--pk-primary);
    border-color: var(--pk-accent-warning);
}

/* Ghost (transparent, border only) */
.pk-btn--ghost {
    background: transparent;
    color: var(--pk-on-surface);
    border-color: var(--pk-border-subtle-strong);
}
.pk-btn--ghost:hover {
    background: var(--pk-surface-high);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Text (no background, no border) */
.pk-btn--text {
    background: transparent;
    color: var(--pk-on-surface-variant);
    border-color: transparent;
    padding-left: var(--pk-space-sm);
    padding-right: var(--pk-space-sm);
}
.pk-btn--text:hover {
    color: var(--pk-primary);
    background: transparent;
}

/* Outline */
.pk-btn--outline {
    background: transparent;
    color: var(--pk-primary);
    border-color: rgba(255, 255, 255, 0.2);
}
.pk-btn--outline:hover {
    background: var(--pk-primary);
    color: var(--pk-on-primary);
}

/* Sizes */
.pk-btn--sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.625rem;
}

.pk-btn--xs {
    padding: 0.25rem 0.5rem;
    font-size: 0.5625rem;
}

.pk-btn--lg {
    padding: 0.875rem 1.75rem;
    font-size: 0.875rem;
}

/* Icon button (square, icon-only) */
.pk-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    background: transparent;
    color: var(--pk-on-surface-variant);
    border: none;
    border-radius: var(--pk-radius);
    cursor: pointer;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
}
.pk-icon-btn:hover {
    background: var(--pk-surface-high);
    color: var(--pk-primary);
}

.pk-icon-btn--sm {
    width: 1.75rem;
    height: 1.75rem;
}
.pk-icon-btn--sm .material-symbols-outlined {
    font-size: 1.125rem;
}


/* ============================================================================
   5. INPUTS (.pk-input, .pk-textarea, .pk-select)
   ============================================================================ */

.pk-field {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.pk-field-label {
    font-family: var(--pk-font-body);
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--pk-outline);
}

.pk-input,
.pk-textarea,
.pk-select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--pk-font-headline);
    font-size: 0.875rem;
    color: var(--pk-on-surface);
    background: var(--pk-surface-lowest);
    border: 1px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    outline: none;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    appearance: none;
    -webkit-appearance: none;
}

.pk-input:focus,
.pk-textarea:focus,
.pk-select:focus {
    border-color: var(--pk-primary);
    background: var(--pk-surface-low);
    box-shadow: 0 0 0 2px var(--pk-border-subtle-strong);
}

.pk-input::placeholder,
.pk-textarea::placeholder {
    color: var(--pk-outline-variant);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pk-input:disabled,
.pk-textarea:disabled,
.pk-select:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

/* Size variants */
.pk-input--sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
}

.pk-input--lg {
    padding: 1rem 1.25rem;
    font-size: 1rem;
}

/* Input with prefix */
.pk-input-group {
    display: flex;
    align-items: stretch;
}

.pk-input-prefix {
    display: flex;
    align-items: center;
    padding: 0 0.75rem;
    background: var(--pk-surface-high);
    border: 1px solid var(--pk-outline-variant);
    border-right: none;
    color: var(--pk-outline);
    font-family: var(--pk-font-headline);
    font-size: 0.875rem;
    font-weight: 700;
}

.pk-input-group .pk-input {
    border-left: none;
}

/* Textarea */
.pk-textarea {
    min-height: 6rem;
    resize: vertical;
    line-height: 1.6;
}

/* Select (native) */
.pk-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23919191' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}


/* ============================================================================
   6. CARD (.pk-card)
   ============================================================================ */

.pk-card {
    background: var(--pk-surface-low);
    border: 1px solid var(--pk-border-subtle);
    border-radius: var(--pk-radius);
    overflow: hidden;
    transition: background var(--pk-duration-normal) var(--pk-ease-mechanical);
}

.pk-card:hover {
    background: var(--pk-surface-container);
}

.pk-card-header {
    padding: var(--pk-space-md) var(--pk-space-lg);
    border-bottom: 1px solid var(--pk-border-subtle);
    font-family: var(--pk-font-headline);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.8125rem;
}

.pk-card-body {
    padding: var(--pk-space-lg);
}

.pk-card-footer {
    padding: var(--pk-space-md) var(--pk-space-lg);
    border-top: 1px solid var(--pk-border-subtle);
}

/* Clickable card */
.pk-card--clickable {
    cursor: pointer;
}
.pk-card--clickable:hover {
    background: var(--pk-surface-high);
    border-color: var(--pk-border-subtle-strong);
}

/* Elevated card */
.pk-card--elevated {
    background: var(--pk-surface-high);
}
.pk-card--elevated:hover {
    background: var(--pk-surface-highest);
}


/* ============================================================================
   7. BADGE (.pk-badge)
   ============================================================================ */

.pk-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.1875rem 0.625rem;
    font-family: var(--pk-font-body);
    font-size: 0.5625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    border-radius: var(--pk-radius);
    white-space: nowrap;
    line-height: 1.4;
    /* Default: neutral */
    background: var(--pk-surface-highest);
    color: var(--pk-on-surface-variant);
    border: 1px solid var(--pk-border-subtle-strong);
}

.pk-badge--primary {
    background: var(--pk-primary);
    color: var(--pk-on-primary);
    border-color: var(--pk-primary);
}

/* Positive / Success badge — gentle green text accent */
.pk-badge--positive,
.pk-badge--success {
    background: var(--pk-positive-container);
    color: var(--pk-accent-success);
    border-color: var(--pk-accent-success);
}

/* Negative / Danger badge — gentle red text accent */
.pk-badge--negative,
.pk-badge--danger {
    background: var(--pk-negative-container);
    color: var(--pk-accent-error);
    border-color: var(--pk-accent-error);
}

/* Caution / Warning badge — gentle amber text accent */
.pk-badge--caution,
.pk-badge--warning {
    background: var(--pk-caution-container);
    color: var(--pk-accent-warning);
    border-color: var(--pk-accent-warning);
}

/* Pulse dot inside badge */
.pk-badge-dot {
    width: 0.375rem;
    height: 0.375rem;
    background: currentColor;
    animation: pk-pulse-glow 2s infinite ease-in-out;
}


/* ============================================================================
   8. ALERT (.pk-alert)
   ============================================================================ */

.pk-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--pk-space-md);
    padding: var(--pk-space-md) var(--pk-space-lg);
    border-left: 4px solid var(--pk-outline-variant);
    background: var(--pk-surface-low);
    font-size: 0.8125rem;
    position: relative;
}

/* Error — gentle red left border accent, dark bg */
.pk-alert--error {
    border-left-color: var(--pk-accent-error);
    background: var(--pk-surface-low);
    color: var(--pk-on-surface);
}
.pk-alert--error .pk-alert-icon { color: var(--pk-accent-error); }

/* Success — gentle green left border accent */
.pk-alert--success {
    border-left-color: var(--pk-accent-success);
    background: var(--pk-surface-container);
    color: var(--pk-on-surface);
}
.pk-alert--success .pk-alert-icon { color: var(--pk-accent-success); }

/* Warning — gentle amber left border accent */
.pk-alert--warning {
    border-left-color: var(--pk-accent-warning);
    background: var(--pk-surface-container);
    color: var(--pk-on-surface);
}
.pk-alert--warning .pk-alert-icon { color: var(--pk-accent-warning); }

/* Info: stays as-is (white border) */
.pk-alert--info {
    border-left-color: var(--pk-primary);
    background: var(--pk-border-subtle);
}

.pk-alert-icon {
    flex-shrink: 0;
    color: inherit;
}

.pk-alert-content {
    flex: 1;
    min-width: 0;
}

.pk-alert-close {
    flex-shrink: 0;
    background: none;
    border: none;
    color: var(--pk-outline);
    cursor: pointer;
    padding: 0.25rem;
    transition: color var(--pk-duration-fast);
}
.pk-alert-close:hover {
    color: var(--pk-primary);
}

/* Hidden state for dismissible alerts */
.pk-alert[hidden] {
    display: none;
}


/* ============================================================================
   9. DIALOG (.pk-dialog)
   ============================================================================ */

.pk-dialog {
    position: fixed;
    inset: 0;
    z-index: var(--pk-z-dialog);
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--pk-space-lg);
}

.pk-dialog[open],
.pk-dialog.pk-dialog--open {
    display: flex;
}

.pk-dialog-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    z-index: var(--pk-z-dialog-backdrop);
}

.pk-dialog-panel {
    position: relative;
    z-index: var(--pk-z-dialog);
    background: var(--pk-surface-low);
    border: 1px solid var(--pk-border-subtle-strong);
    border-radius: var(--pk-radius);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--pk-shadow-float);
    animation: pk-dialog-in var(--pk-duration-normal) var(--pk-ease-mechanical);
}

.pk-dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--pk-space-md) var(--pk-space-lg);
    border-bottom: 1px solid var(--pk-border-subtle);
}

.pk-dialog-title {
    font-family: var(--pk-font-headline);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--pk-primary);
}

.pk-dialog-close {
    background: none;
    border: none;
    color: var(--pk-outline);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    transition: color var(--pk-duration-fast);
}
.pk-dialog-close:hover {
    color: var(--pk-primary);
}

.pk-dialog-body {
    padding: var(--pk-space-lg);
    overflow-y: auto;
    flex: 1;
}

.pk-dialog-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--pk-space-sm);
    padding: var(--pk-space-md) var(--pk-space-lg);
    border-top: 1px solid var(--pk-border-subtle);
}

@keyframes pk-dialog-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* ============================================================================
   10. LOADER (.pk-loader)
   Uses the PK logo SVG with breathing animation.
   Replaces the old .pk-spinner (kept as alias for backward compat).
   ============================================================================ */

/* Loader-specific breathing: deeper fade + size pulse toward center */
@keyframes pk-loader-breathe {
    0%, 100% {
        opacity: 0.4;
        transform: scale(0.92);
    }
    50% {
        opacity: 1;
        transform: scale(1);
    }
}

.pk-loader,
.pk-spinner {
    display: inline-block;
    width: 3rem;
    height: 3rem;
    background: url('pk.svg') no-repeat center / contain;
    animation: pk-loader-breathe 2000ms ease-in-out infinite;
}

.pk-loader--sm,
.pk-spinner--sm {
    width: 1.5rem;
    height: 1.5rem;
}

/* Spin variant — for inline/small loaders (console, buttons, status text).
   Use instead of breathing when the loader is small and inline. */
@keyframes pk-loader-spin {
    to { transform: rotate(360deg); }
}

.pk-loader--spin {
    animation: pk-loader-spin 1.2s linear infinite;
}

.pk-loader--lg,
.pk-spinner--lg {
    width: 5rem;
    height: 5rem;
}

/* Full-page loading overlay */
.pk-loading-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--pk-space-lg);
    background: var(--pk-surface);
    z-index: 9999;
}

.pk-loading-overlay .pk-loader,
.pk-loading-overlay .pk-spinner {
    width: 5rem;
    height: 5rem;
}

.pk-loading-text {
    font-family: var(--pk-font-headline);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--pk-outline);
}


/* ============================================================================
   11. SKELETON (.pk-skeleton)
   ============================================================================ */

.pk-skeleton {
    background: var(--pk-surface-high);
    animation: pk-skeleton-pulse 1.5s var(--pk-ease-mechanical) infinite;
    border-radius: var(--pk-radius);
}

@keyframes pk-skeleton-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.pk-skeleton--sheen {
    background: linear-gradient(
        90deg,
        var(--pk-surface-high) 0%,
        var(--pk-surface-highest) 50%,
        var(--pk-surface-high) 100%
    );
    background-size: 200% 100%;
    animation: pk-skeleton-sheen 1.5s var(--pk-ease-mechanical) infinite;
}

@keyframes pk-skeleton-sheen {
    from { background-position: 200% 0; }
    to { background-position: -200% 0; }
}


/* ============================================================================
   12. TOOLTIP & POPOVER

   Tooltip: small text hint on hover/click.
   Usage: <span data-tooltip="Hint text">element</span>

   Popover: richer content panel on hover/click.
   Usage: <span class="pk-popover-trigger" data-pk-popover="popover-id">
            element
          </span>
          <div class="pk-popover" id="popover-id">Rich content</div>
   ============================================================================ */

/* --- Tooltip (rendered by JS into a floating element) --- */
.pk-tooltip-el {
    position: fixed;
    z-index: var(--pk-z-tooltip);
    padding: 0.375rem 0.75rem;
    background: var(--pk-surface-highest);
    color: var(--pk-on-surface);
    font-family: var(--pk-font-body);
    font-size: 0.6875rem;
    font-weight: 500;
    white-space: nowrap;
    border: 1px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--pk-duration-fast) var(--pk-ease-mechanical);
    max-width: 300px;
    white-space: normal;
    word-break: break-word;
}

.pk-tooltip-el.pk-tooltip-el--visible {
    opacity: 1;
}

/* --- Popover (floating content panel) --- */
.pk-popover {
    position: fixed;
    z-index: var(--pk-z-tooltip);
    padding: var(--pk-space-md);
    background: var(--pk-surface-high);
    color: var(--pk-on-surface);
    font-family: var(--pk-font-body);
    font-size: 0.8125rem;
    border: 1px solid var(--pk-border-subtle-strong);
    border-radius: var(--pk-radius);
    box-shadow: var(--pk-shadow-float);
    display: none;
    max-width: 350px;
    animation: pk-menu-in var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-popover--open {
    display: block;
}


/* ============================================================================
   13. CHECKBOX (.pk-checkbox)
   ============================================================================ */

.pk-checkbox {
    display: inline-flex;
    align-items: center;
    gap: var(--pk-space-sm);
    cursor: pointer;
    font-size: 0.8125rem;
    user-select: none;
}

.pk-checkbox input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 1.125rem;
    height: 1.125rem;
    border: 2px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    background: transparent;
    cursor: pointer;
    position: relative;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    flex-shrink: 0;
}

.pk-checkbox input[type="checkbox"]:checked {
    background: var(--pk-primary);
    border-color: var(--pk-primary);
}

.pk-checkbox input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 48%;
    width: 5px;
    height: 9px;
    border: solid var(--pk-on-primary);
    border-width: 0 2px 2px 0;
    transform: translate(-50%, -50%) rotate(45deg);
}

.pk-checkbox input[type="checkbox"]:focus-visible {
    outline: 2px solid var(--pk-primary);
    outline-offset: 2px;
}


/* ============================================================================
   14. SWITCH (.pk-switch)
   ============================================================================ */

.pk-switch {
    display: inline-flex;
    align-items: center;
    gap: var(--pk-space-sm);
    cursor: pointer;
    user-select: none;
    font-size: 0.8125rem;
}

.pk-switch-track {
    position: relative;
    width: 2.5rem;
    height: 1.25rem;
    background: var(--pk-surface-highest);
    border-radius: var(--pk-radius);
    transition: background var(--pk-duration-fast) var(--pk-ease-mechanical);
    flex-shrink: 0;
}

.pk-switch input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.pk-switch-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: calc(1.25rem - 4px);
    height: calc(1.25rem - 4px);
    background: var(--pk-outline);
    border-radius: var(--pk-radius);
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-switch input:checked + .pk-switch-track {
    background: var(--pk-primary);
}

.pk-switch input:checked + .pk-switch-track .pk-switch-thumb {
    left: calc(100% - 1.25rem + 2px);
    background: var(--pk-on-primary);
}


/* ============================================================================
   15. PROGRESS BAR (.pk-progress)
   ============================================================================ */

.pk-progress {
    width: 100%;
    height: 0.375rem;
    background: var(--pk-surface-highest);
    border-radius: var(--pk-radius);
    overflow: hidden;
}

.pk-progress-bar {
    height: 100%;
    background: var(--pk-primary);
    transition: width var(--pk-duration-normal) var(--pk-ease-mechanical);
    min-width: 0;
}

.pk-progress--sm {
    height: 0.25rem;
}

/* Indeterminate */
.pk-progress--indeterminate .pk-progress-bar {
    width: 30%;
    animation: pk-progress-indeterminate 1.5s var(--pk-ease-mechanical) infinite;
}

@keyframes pk-progress-indeterminate {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}


/* ============================================================================
   16. TABS (.pk-tabs)
   ============================================================================ */

.pk-tabs-nav {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--pk-border-subtle-strong);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.pk-tab {
    padding: 0.75rem 1.25rem;
    font-family: var(--pk-font-headline);
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--pk-outline);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    white-space: nowrap;
}

.pk-tab:hover {
    color: var(--pk-on-surface);
    background: var(--pk-surface-high);
}

.pk-tab[aria-selected="true"],
.pk-tab.pk-tab--active {
    color: var(--pk-primary);
    border-bottom-color: var(--pk-primary);
}

.pk-tab-panel {
    display: none;
    padding: var(--pk-space-lg) 0;
}

.pk-tab-panel[aria-hidden="false"],
.pk-tab-panel.pk-tab-panel--active {
    display: block;
}


/* ============================================================================
   17. DROPDOWN (.pk-dropdown) + MENU (.pk-menu)
   ============================================================================ */

.pk-dropdown {
    position: relative;
    display: inline-block;
}

.pk-menu {
    position: absolute;
    top: calc(100% + 0.25rem);
    left: 0;
    min-width: 12rem;
    background: var(--pk-surface-high);
    border: 1px solid var(--pk-border-subtle-strong);
    border-radius: var(--pk-radius);
    box-shadow: var(--pk-shadow-float);
    z-index: var(--pk-z-dropdown);
    display: none;
    animation: pk-menu-in var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-menu--open {
    display: block;
}

.pk-menu-item {
    display: flex;
    align-items: center;
    gap: var(--pk-space-sm);
    padding: 0.625rem 1rem;
    font-family: var(--pk-font-headline);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--pk-on-surface);
    cursor: pointer;
    transition: background var(--pk-duration-fast) var(--pk-ease-mechanical);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.pk-menu-item:hover {
    background: var(--pk-surface-highest);
}

.pk-menu-item--danger {
    color: var(--pk-negative);
}

.pk-menu-item--danger:hover {
    background: rgba(27, 27, 27, 0.6);
}

@keyframes pk-menu-in {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* ============================================================================
   18. DIVIDER (.pk-divider)
   ============================================================================ */

.pk-divider {
    border: none;
    height: 1px;
    background: var(--pk-border-subtle);
    margin: var(--pk-space-md) 0;
}

.pk-divider--strong {
    background: var(--pk-outline-variant);
}


/* ============================================================================
   19. ICONS (Material Symbols)
   ============================================================================ */

.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    vertical-align: middle;
    user-select: none;
}

/* Icon sizes */
.pk-icon--sm { font-size: 1rem; }
.pk-icon--md { font-size: 1.5rem; }
.pk-icon--lg { font-size: 2rem; }


/* ============================================================================
   20. ANIMATIONS
   ============================================================================ */

/* Breathing: active elements pulse subtly */
@keyframes pk-breathing {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.85; transform: scale(1.02); }
}
.pk-breathing {
    animation: pk-breathing 3000ms var(--pk-ease-mechanical) infinite;
}

/* Pulse glow: status indicators */
@keyframes pk-pulse-glow {
    0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4); }
    70% { box-shadow: 0 0 0 8px rgba(255, 255, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}
.pk-pulse-glow {
    animation: pk-pulse-glow 2000ms infinite ease-in-out;
}

/* Ripple: a rectangular wave expands outward from center and fades.
   Like a drop hitting still water. For "alive" / "running" indicators.
   Uses --pk-ripple-spread to scale with element size. Defaults to 10px
   for small elements (badges); override or use size modifiers for larger ones. */
@keyframes pk-ripple {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.3);
    }
    70% {
        box-shadow: 0 0 0 var(--pk-ripple-spread, 10px) rgba(255, 255, 255, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
    }
}
.pk-ripple {
    animation: pk-ripple 2500ms ease-out infinite;
}

/* Ripple size modifiers — use when the element is larger than a badge */
.pk-ripple--sm  { --pk-ripple-spread: 6px; }
.pk-ripple--md  { --pk-ripple-spread: 10px; }  /* same as default */
.pk-ripple--lg  { --pk-ripple-spread: 20px; }
.pk-ripple--xl  { --pk-ripple-spread: 35px; }

/* Auto-scale ripple when combined with pk-loader sizes */
.pk-loader.pk-ripple,
.pk-spinner.pk-ripple           { --pk-ripple-spread: 14px; }  /* 3rem loader */
.pk-loader--sm.pk-ripple,
.pk-spinner--sm.pk-ripple       { --pk-ripple-spread: 8px; }   /* 1.5rem loader */
.pk-loader--lg.pk-ripple,
.pk-spinner--lg.pk-ripple       { --pk-ripple-spread: 24px; }  /* 5rem loader */

/* Staggered reveal: page load entrance */
@keyframes pk-stagger-in {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.pk-stagger-in {
    animation: pk-stagger-in var(--pk-duration-normal) var(--pk-ease-mechanical) both;
}

/* Breathing hover (apply to interactive elements) */
.pk-breathing-hover:hover {
    animation: pk-breathing 2000ms var(--pk-ease-mechanical) infinite;
}


/* ============================================================================
   21. TABLE STYLES
   ============================================================================ */

.pk-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.pk-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.pk-table thead th {
    padding: 0.75rem 1rem;
    font-family: var(--pk-font-body);
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--pk-outline);
    border-bottom: 1px solid var(--pk-border-subtle-strong);
    background: var(--pk-surface-high);
}

.pk-table tbody td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--pk-border-subtle);
    vertical-align: middle;
}

.pk-table tbody tr {
    transition: background var(--pk-duration-normal) var(--pk-ease-mechanical);
}

.pk-table tbody tr:hover {
    background: var(--pk-surface-low);
}

/* Cell alignment & text utilities */
.pk-table .pk-table-cell--right { text-align: right; }
.pk-table .pk-table-cell--center { text-align: center; }
.pk-table .pk-table-cell--truncate {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 0;
}

/* Muted row (deleted / inactive items) */
.pk-table .pk-table-row--muted { opacity: 0.35; }

/* Sortable header (visual only — sort logic is app-specific) */
.pk-table-th--sortable {
    cursor: pointer;
    user-select: none;
    transition: color var(--pk-duration-fast) var(--pk-ease-mechanical);
}
.pk-table-th--sortable:hover {
    color: var(--pk-on-surface-variant);
}
.pk-table-sort-indicator {
    font-size: 0.625rem;
    color: var(--pk-on-surface-variant);
    margin-left: 0.25rem;
}

/* Fix pk-hide-mobile on table cells: needs table-cell, not block, on desktop */
.pk-table th.pk-hide-mobile,
.pk-table td.pk-hide-mobile { display: none; }
@media (min-width: 768px) {
    .pk-table th.pk-hide-mobile,
    .pk-table td.pk-hide-mobile { display: table-cell; }
}

/* Responsive: card transform on mobile */
@media (max-width: 639px) {
    .pk-table--responsive thead {
        display: none;
    }
    .pk-table--responsive tbody tr {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 0 0.75rem;
        padding: 0.75rem 1rem;
        margin-bottom: 0.5rem;
        background: var(--pk-surface-low);
        border: 1px solid var(--pk-border-subtle);
        transition: background var(--pk-duration-normal) var(--pk-ease-mechanical);
    }
    .pk-table--responsive tbody tr:hover {
        background: var(--pk-surface-container);
        border-color: var(--pk-border-subtle-strong);
    }
    .pk-table--responsive tbody td {
        padding: 0.25rem 0;
        border-bottom: none;
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
    }
    /* Data cells: full-width label:value rows */
    .pk-table--responsive tbody td[data-label] {
        display: flex;
        width: 100%;
        justify-content: space-between;
        align-items: baseline;
        gap: 1rem;
    }
    .pk-table--responsive tbody td[data-label]::after {
        content: attr(data-label);
        flex-shrink: 0;
        font-size: 0.625rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.15em;
        color: var(--pk-outline);
        order: 1;
    }
    /* Accessory cells (no data-label): icons, checkboxes — grouped at card top */
    .pk-table--responsive tbody td:not([data-label]) {
        order: -1;
    }
    /* Push last accessory cell to the right edge of the card */
    .pk-table--responsive tbody td:not([data-label]) ~ td:not([data-label]) {
        margin-left: auto;
    }
    .pk-table--responsive tbody td.pk-table-cell--truncate {
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
        max-width: none;
    }
}


/* ============================================================================
   22. PRE / CODE (for log/console displays)
   ============================================================================ */

.pk-pre {
    background: var(--pk-black);
    color: var(--pk-on-surface);
    padding: var(--pk-space-lg);
    font-family: var(--pk-font-mono);
    font-size: 0.75rem;
    line-height: 1.7;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    border: 1px solid var(--pk-border-subtle);
}


/* ============================================================================
   23. RESPONSIVE UTILITIES
   ============================================================================ */

.pk-hide-mobile { display: none; }
.pk-hide-desktop { display: block; }

@media (min-width: 768px) {
    .pk-hide-mobile { display: block; }
    .pk-hide-desktop { display: none; }
}

/* Stack on mobile */
@media (max-width: 639px) {
    .pk-stack-mobile {
        flex-direction: column;
    }
    .pk-full-mobile {
        width: 100%;
    }
}


/* ============================================================================
   24. BUTTON GROUP (.pk-btn-group)
   ============================================================================ */

.pk-btn-group {
    display: inline-flex;
}

.pk-btn-group .pk-btn {
    border-radius: var(--pk-radius);
    margin-left: -1px;
}

.pk-btn-group .pk-btn:first-child {
    margin-left: 0;
}

.pk-btn-group .pk-btn:hover,
.pk-btn-group .pk-btn:focus {
    z-index: 1;
}


/* ============================================================================
   25. FAB / FLOATING ACTION BUTTON (.pk-fab)
   ============================================================================ */

.pk-fab {
    position: fixed;
    bottom: var(--pk-space-xl);
    right: var(--pk-space-xl);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    background: var(--pk-primary);
    color: var(--pk-on-primary);
    border: none;
    border-radius: var(--pk-radius);
    cursor: pointer;
    z-index: 50;
    box-shadow: var(--pk-shadow-float);
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-fab:hover {
    background: var(--pk-primary-container);
    transform: scale(1.05);
}

.pk-fab:active {
    transform: scale(0.95);
}

.pk-fab--sm {
    width: 2.5rem;
    height: 2.5rem;
}

.pk-fab--lg {
    width: 4.5rem;
    height: 4.5rem;
}

.pk-fab--extended {
    width: auto;
    padding: 0 var(--pk-space-lg);
    gap: var(--pk-space-sm);
    font-family: var(--pk-font-headline);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.pk-fab--secondary {
    background: var(--pk-surface-highest);
    color: var(--pk-on-surface);
    border: 1px solid var(--pk-outline-variant);
}

.pk-fab--secondary:hover {
    background: var(--pk-surface-bright);
    color: var(--pk-primary);
}


/* ============================================================================
   26. RADIO (.pk-radio)
   ============================================================================ */

.pk-radio {
    display: inline-flex;
    align-items: center;
    gap: var(--pk-space-sm);
    cursor: pointer;
    font-size: 0.8125rem;
    user-select: none;
}

.pk-radio input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    width: 1.125rem;
    height: 1.125rem;
    border: 2px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    background: transparent;
    cursor: pointer;
    position: relative;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    flex-shrink: 0;
}

.pk-radio input[type="radio"]:checked {
    border-color: var(--pk-primary);
    background: transparent;
}

.pk-radio input[type="radio"]:checked::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    right: 3px;
    bottom: 3px;
    background: var(--pk-primary);
}

.pk-radio input[type="radio"]:focus-visible {
    outline: 2px solid var(--pk-primary);
    outline-offset: 2px;
}

.pk-radio input[type="radio"]:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.pk-radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--pk-space-sm);
}

.pk-radio-group--horizontal {
    flex-direction: row;
    gap: var(--pk-space-lg);
}


/* ============================================================================
   27. RATING (.pk-rating)
   Brutalist: uses square blocks instead of stars.
   ============================================================================ */

.pk-rating {
    display: inline-flex;
    gap: 0.25rem;
    align-items: center;
}

.pk-rating-block {
    width: 1.5rem;
    height: 1.5rem;
    background: var(--pk-surface-highest);
    border: 1px solid var(--pk-outline-variant);
    cursor: pointer;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-rating-block:hover,
.pk-rating-block--active {
    background: var(--pk-primary);
    border-color: var(--pk-primary);
}

.pk-rating-block--half {
    background: linear-gradient(90deg, var(--pk-primary) 50%, var(--pk-surface-highest) 50%);
    border-color: var(--pk-outline-variant);
}

.pk-rating--sm .pk-rating-block {
    width: 1rem;
    height: 1rem;
}

.pk-rating--lg .pk-rating-block {
    width: 2rem;
    height: 2rem;
}

.pk-rating--disabled {
    pointer-events: none;
    opacity: 0.5;
}


/* ============================================================================
   28. SLIDER (.pk-slider)
   ============================================================================ */

.pk-slider {
    width: 100%;
    position: relative;
}

.pk-slider input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--pk-surface-highest);
    outline: none;
    cursor: pointer;
    border-radius: var(--pk-radius);
}

.pk-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    background: var(--pk-primary);
    border: none;
    border-radius: var(--pk-radius);
    cursor: pointer;
    transition: transform var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-slider input[type="range"]::-moz-range-thumb {
    width: 1.25rem;
    height: 1.25rem;
    background: var(--pk-primary);
    border: none;
    border-radius: var(--pk-radius);
    cursor: pointer;
}

.pk-slider input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.pk-slider input[type="range"]:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.pk-slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--pk-space-xs);
    font-size: 0.625rem;
    color: var(--pk-outline);
    font-family: var(--pk-font-body);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}


/* ============================================================================
   29. TOGGLE BUTTON (.pk-toggle-btn)
   ============================================================================ */

.pk-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--pk-space-sm);
    padding: 0.625rem 1.25rem;
    font-family: var(--pk-font-headline);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border: 1px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    cursor: pointer;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    background: var(--pk-surface-high);
    color: var(--pk-on-surface-variant);
    user-select: none;
}

.pk-toggle-btn:hover {
    background: var(--pk-surface-bright);
    color: var(--pk-on-surface);
}

.pk-toggle-btn[aria-pressed="true"],
.pk-toggle-btn--active {
    background: var(--pk-primary);
    color: var(--pk-on-primary);
    border-color: var(--pk-primary);
}

.pk-toggle-btn[aria-pressed="true"]:hover,
.pk-toggle-btn--active:hover {
    background: var(--pk-primary-container);
}

.pk-toggle-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}


/* ============================================================================
   30. AUTOCOMPLETE (.pk-autocomplete)
   ============================================================================ */

.pk-autocomplete {
    position: relative;
    width: 100%;
}

.pk-autocomplete .pk-input {
    width: 100%;
}

.pk-autocomplete-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: var(--pk-z-dropdown);
    background: var(--pk-surface-high);
    border: 1px solid var(--pk-border-subtle-strong);
    border-top: none;
    max-height: 15rem;
    overflow-y: auto;
    display: none;
    box-shadow: var(--pk-shadow-float);
    animation: pk-menu-in var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-autocomplete-list--open {
    display: block;
}

.pk-autocomplete-item {
    padding: 0.625rem 1rem;
    font-family: var(--pk-font-headline);
    font-size: 0.8125rem;
    color: var(--pk-on-surface);
    cursor: pointer;
    transition: background var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-autocomplete-item:hover,
.pk-autocomplete-item--highlighted {
    background: var(--pk-surface-highest);
}

.pk-autocomplete-item--selected {
    background: var(--pk-surface-bright);
    color: var(--pk-primary);
}

.pk-autocomplete-empty {
    padding: 0.625rem 1rem;
    font-size: 0.75rem;
    color: var(--pk-outline);
    font-style: italic;
}


/* ============================================================================
   31. AVATAR (.pk-avatar)
   Brutalist: square, no border-radius.
   ============================================================================ */

.pk-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--pk-surface-highest);
    color: var(--pk-on-surface);
    border: 1px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    overflow: hidden;
    font-family: var(--pk-font-headline);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    flex-shrink: 0;
}

.pk-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.pk-avatar--xs {
    width: 1.5rem;
    height: 1.5rem;
    font-size: 0.5625rem;
}

.pk-avatar--sm {
    width: 2rem;
    height: 2rem;
    font-size: 0.75rem;
}

.pk-avatar--lg {
    width: 3.5rem;
    height: 3.5rem;
    font-size: 1.25rem;
}

.pk-avatar--xl {
    width: 5rem;
    height: 5rem;
    font-size: 1.75rem;
}

.pk-avatar-group {
    display: flex;
}

.pk-avatar-group .pk-avatar {
    margin-left: -0.5rem;
    border: 2px solid var(--pk-surface);
}

.pk-avatar-group .pk-avatar:first-child {
    margin-left: 0;
}


/* ============================================================================
   32. CHIP (.pk-chip)
   ============================================================================ */

.pk-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.75rem;
    font-family: var(--pk-font-headline);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border: 1px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    background: var(--pk-surface-high);
    color: var(--pk-on-surface);
    cursor: default;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    white-space: nowrap;
}

.pk-chip--clickable {
    cursor: pointer;
}

.pk-chip--clickable:hover {
    background: var(--pk-surface-bright);
    border-color: var(--pk-on-surface-variant);
}

.pk-chip--active {
    background: var(--pk-primary);
    color: var(--pk-on-primary);
    border-color: var(--pk-primary);
}

.pk-chip--active:hover {
    background: var(--pk-primary-container);
}

.pk-chip-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1rem;
    height: 1rem;
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 0;
    opacity: 0.6;
    transition: opacity var(--pk-duration-fast);
    font-size: 0.875rem;
    line-height: 1;
}

.pk-chip-close:hover {
    opacity: 1;
}

.pk-chip .material-symbols-outlined {
    font-size: 0.875rem;
}


/* ============================================================================
   33. LIST (.pk-list)
   ============================================================================ */

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

.pk-list-item {
    display: flex;
    align-items: center;
    gap: var(--pk-space-md);
    padding: 0.75rem var(--pk-space-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    transition: background var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-list-item:last-child {
    border-bottom: none;
}

.pk-list-item:hover {
    background: var(--pk-surface-low);
}

.pk-list-item--clickable {
    cursor: pointer;
}

.pk-list-item--clickable:hover {
    background: var(--pk-surface-high);
}

.pk-list-item--active {
    background: var(--pk-surface-high);
    border-left: 3px solid var(--pk-primary);
}

.pk-list-item-icon {
    flex-shrink: 0;
    color: var(--pk-outline);
}

.pk-list-item-content {
    flex: 1;
    min-width: 0;
}

.pk-list-item-primary {
    font-size: 0.8125rem;
    color: var(--pk-on-surface);
}

.pk-list-item-secondary {
    font-size: 0.6875rem;
    color: var(--pk-outline);
    margin-top: 0.125rem;
}

.pk-list-item-action {
    flex-shrink: 0;
}

.pk-list-subheader {
    padding: var(--pk-space-sm) var(--pk-space-md);
    font-family: var(--pk-font-body);
    font-size: 0.5625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--pk-outline);
}

.pk-list--bordered {
    border: 1px solid var(--pk-border-subtle);
}

.pk-list--dense .pk-list-item {
    padding: 0.5rem var(--pk-space-md);
}


/* ============================================================================
   34. TYPOGRAPHY CLASSES
   ============================================================================ */

.pk-text-display {
    font-family: var(--pk-font-display);
    font-size: 3.5rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    line-height: 1;
    color: var(--pk-primary);
}

.pk-text-display--sm {
    font-size: 2.25rem;
}

.pk-text-display--lg {
    font-size: 5rem;
}

.pk-text-headline {
    font-family: var(--pk-font-headline);
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--pk-primary);
}

.pk-text-headline--sm {
    font-size: 1.125rem;
}

.pk-text-headline--lg {
    font-size: 2rem;
}

.pk-text-title {
    font-family: var(--pk-font-headline);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1.3;
    color: var(--pk-on-surface);
}

.pk-text-title--sm {
    font-size: 0.8125rem;
}

.pk-text-title--lg {
    font-size: 1.25rem;
}

.pk-text-body {
    font-family: var(--pk-font-body);
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--pk-on-surface);
}

.pk-text-body--sm {
    font-size: 0.75rem;
}

.pk-text-body--lg {
    font-size: 1rem;
}

.pk-text-label {
    font-family: var(--pk-font-body);
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--pk-outline);
}

.pk-text-label--lg {
    font-size: 0.75rem;
}

.pk-text-caption {
    font-family: var(--pk-font-body);
    font-size: 0.6875rem;
    font-weight: 400;
    line-height: 1.4;
    color: var(--pk-on-surface-variant);
}


/* ============================================================================
   35. BACKDROP (.pk-backdrop)
   ============================================================================ */

.pk-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    z-index: var(--pk-z-dialog-backdrop);
    display: none;
    transition: opacity var(--pk-duration-normal) var(--pk-ease-mechanical);
}

.pk-backdrop--open {
    display: block;
}


/* ============================================================================
   36. SNACKBAR (.pk-snackbar)
   ============================================================================ */

.pk-snackbar {
    position: fixed;
    bottom: var(--pk-space-xl);
    left: 50%;
    transform: translateX(-50%) translateY(calc(100% + var(--pk-space-xl)));
    z-index: var(--pk-z-tooltip);
    display: flex;
    align-items: center;
    gap: var(--pk-space-md);
    padding: 0.75rem var(--pk-space-lg);
    background: var(--pk-surface-highest);
    color: var(--pk-on-surface);
    border: 1px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    font-family: var(--pk-font-body);
    font-size: 0.8125rem;
    box-shadow: var(--pk-shadow-float);
    transition: transform var(--pk-duration-normal) var(--pk-ease-mechanical);
    max-width: calc(100vw - var(--pk-space-xl) * 2);
}

.pk-snackbar--open {
    transform: translateX(-50%) translateY(0);
}

.pk-snackbar-action {
    font-family: var(--pk-font-headline);
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: none;
    border: none;
    color: var(--pk-primary);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    white-space: nowrap;
    transition: opacity var(--pk-duration-fast);
}

.pk-snackbar-action:hover {
    opacity: 0.7;
}

.pk-snackbar-close {
    background: none;
    border: none;
    color: var(--pk-outline);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    transition: color var(--pk-duration-fast);
}

.pk-snackbar-close:hover {
    color: var(--pk-primary);
}


/* ============================================================================
   37. ACCORDION (.pk-accordion)
   ============================================================================ */

.pk-accordion {
    border: 1px solid var(--pk-border-subtle);
}

.pk-accordion-item {
    border-bottom: 1px solid var(--pk-border-subtle);
}

.pk-accordion-item:last-child {
    border-bottom: none;
}

.pk-accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--pk-space-md) var(--pk-space-lg);
    background: var(--pk-surface-low);
    border: none;
    color: var(--pk-on-surface);
    font-family: var(--pk-font-headline);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: background var(--pk-duration-fast) var(--pk-ease-mechanical);
    text-align: left;
}

.pk-accordion-header:hover {
    background: var(--pk-surface-container);
}

.pk-accordion-icon {
    transition: transform var(--pk-duration-fast) var(--pk-ease-mechanical);
    flex-shrink: 0;
    color: var(--pk-outline);
    font-size: 1.25rem;
}

.pk-accordion-item--open .pk-accordion-icon {
    transform: rotate(180deg);
}

.pk-accordion-item--open .pk-accordion-header {
    background: var(--pk-surface-container);
    color: var(--pk-primary);
}

.pk-accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--pk-duration-normal) var(--pk-ease-mechanical);
}

.pk-accordion-item--open .pk-accordion-body {
    max-height: 500px;
}

.pk-accordion-content {
    padding: var(--pk-space-lg);
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--pk-on-surface-variant);
}


/* ============================================================================
   38. APP BAR (.pk-appbar)
   ============================================================================ */

.pk-appbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--pk-space-md) var(--pk-space-lg);
    background: var(--pk-surface-lowest);
    border-bottom: 1px solid var(--pk-border-subtle);
    position: sticky;
    top: 0;
    z-index: 40;
    min-height: 3.5rem;
}

.pk-appbar-title {
    font-family: var(--pk-font-display);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    color: var(--pk-primary);
    line-height: 1;
}

.pk-appbar-nav {
    display: flex;
    align-items: center;
    gap: var(--pk-space-sm);
}

.pk-appbar-actions {
    display: flex;
    align-items: center;
    gap: var(--pk-space-sm);
}

.pk-appbar--dense {
    min-height: 2.75rem;
    padding: var(--pk-space-sm) var(--pk-space-lg);
}

.pk-appbar--prominent {
    min-height: 8rem;
    align-items: flex-end;
    padding-bottom: var(--pk-space-lg);
}


/* ============================================================================
   38b. PAGE HEADER (.pk-page-header)
   ============================================================================ */

.pk-page-header {
    display: flex;
    align-items: center;
    gap: var(--pk-space-sm);
    margin-bottom: var(--pk-space-lg);
}

.pk-page-header-title {
    font-family: var(--pk-font-headline);
    font-size: clamp(1.25rem, 4vw, 2rem);
    font-weight: 700;
    color: var(--pk-on-surface);
    flex: 1;
    min-width: 0;
}

.pk-page-header-actions {
    display: flex;
    gap: var(--pk-space-sm);
    align-items: center;
}


/* ============================================================================
   39. PAPER (.pk-paper)
   ============================================================================ */

.pk-paper {
    background: var(--pk-surface-low);
    border: 1px solid var(--pk-border-subtle);
    border-radius: var(--pk-radius);
    padding: var(--pk-space-lg);
}

.pk-paper--elevation-0 {
    background: var(--pk-surface);
    border: none;
}

.pk-paper--elevation-1 {
    background: var(--pk-surface-low);
}

.pk-paper--elevation-2 {
    background: var(--pk-surface-container);
}

.pk-paper--elevation-3 {
    background: var(--pk-surface-high);
}

.pk-paper--elevation-4 {
    background: var(--pk-surface-highest);
}

.pk-paper--outlined {
    background: transparent;
    border: 1px solid var(--pk-outline-variant);
}


/* ============================================================================
   40. BOTTOM NAVIGATION (.pk-bottom-nav)
   ============================================================================ */

.pk-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: stretch;
    justify-content: space-around;
    background: var(--pk-surface-lowest);
    border-top: 1px solid var(--pk-border-subtle);
    z-index: 40;
    min-height: 3.5rem;
}

.pk-bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.125rem;
    flex: 1;
    padding: 0.5rem 0;
    background: none;
    border: none;
    color: var(--pk-outline);
    cursor: pointer;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    text-decoration: none;
    font-family: var(--pk-font-body);
    font-size: 0.5625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.pk-bottom-nav-item:hover {
    color: var(--pk-on-surface);
    background: var(--pk-surface-high);
}

.pk-bottom-nav-item--active {
    color: var(--pk-primary);
}

.pk-bottom-nav-item--active::after {
    content: '';
    position: absolute;
    top: 0;
    left: 25%;
    right: 25%;
    height: 2px;
    background: var(--pk-primary);
}

.pk-bottom-nav-item {
    position: relative;
}


/* ============================================================================
   41. BREADCRUMBS (.pk-breadcrumbs)
   ============================================================================ */

.pk-breadcrumbs {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0;
    font-family: var(--pk-font-body);
    font-size: 0.75rem;
    color: var(--pk-outline);
}

.pk-breadcrumb-item {
    display: inline-flex;
    align-items: center;
}

.pk-breadcrumb-item a {
    color: var(--pk-on-surface-variant);
    text-decoration: none;
    transition: color var(--pk-duration-fast);
}

.pk-breadcrumb-item a:hover {
    color: var(--pk-primary);
}

.pk-breadcrumb-separator {
    margin: 0 var(--pk-space-sm);
    color: var(--pk-outline-variant);
    user-select: none;
}

.pk-breadcrumb-item:last-child {
    color: var(--pk-on-surface);
    font-weight: 600;
}


/* ============================================================================
   42. DRAWER (.pk-drawer)
   ============================================================================ */

.pk-drawer {
    position: fixed;
    top: 0;
    bottom: 0;
    width: 300px;
    max-width: 85vw;
    background: var(--pk-surface-low);
    border-right: 1px solid var(--pk-border-subtle);
    z-index: var(--pk-z-dialog);
    transform: translateX(-100%);
    transition: transform var(--pk-duration-normal) var(--pk-ease-mechanical);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.pk-drawer--right {
    left: auto;
    right: 0;
    border-right: none;
    border-left: 1px solid var(--pk-border-subtle);
    transform: translateX(100%);
}

.pk-drawer--open {
    transform: translateX(0);
}

.pk-drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--pk-space-md) var(--pk-space-lg);
    border-bottom: 1px solid var(--pk-border-subtle);
}

.pk-drawer-title {
    font-family: var(--pk-font-headline);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--pk-primary);
}

.pk-drawer-body {
    flex: 1;
    padding: var(--pk-space-lg);
    overflow-y: auto;
}

.pk-drawer-close {
    background: none;
    border: none;
    color: var(--pk-outline);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    transition: color var(--pk-duration-fast);
}

.pk-drawer-close:hover {
    color: var(--pk-primary);
}

.pk-drawer-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    z-index: calc(var(--pk-z-dialog) - 1);
    display: none;
}

.pk-drawer-backdrop--open {
    display: block;
}


/* ============================================================================
   43. LINK (.pk-link)
   ============================================================================ */

.pk-link {
    color: var(--pk-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--pk-outline-variant);
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    padding-bottom: 1px;
}

.pk-link:hover {
    color: var(--pk-on-surface);
    border-bottom-color: var(--pk-primary);
}

.pk-link--subtle {
    color: var(--pk-on-surface-variant);
    border-bottom-color: transparent;
}

.pk-link--subtle:hover {
    color: var(--pk-primary);
    border-bottom-color: var(--pk-primary);
}

.pk-link--icon {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}


/* ============================================================================
   44. PAGINATION (.pk-pagination)
   ============================================================================ */

.pk-pagination {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.pk-pagination-item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 2rem;
    padding: 0 0.5rem;
    font-family: var(--pk-font-headline);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--pk-on-surface-variant);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--pk-radius);
    cursor: pointer;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    text-decoration: none;
}

.pk-pagination-item:hover {
    background: var(--pk-surface-high);
    color: var(--pk-on-surface);
}

.pk-pagination-item--active {
    background: var(--pk-primary);
    color: var(--pk-on-primary);
    border-color: var(--pk-primary);
}

.pk-pagination-item--active:hover {
    background: var(--pk-primary-container);
}

.pk-pagination-item:disabled,
.pk-pagination-item--disabled {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

.pk-pagination-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    color: var(--pk-outline);
    font-size: 0.75rem;
    user-select: none;
}


/* ============================================================================
   45. SPEED DIAL (.pk-speed-dial)
   ============================================================================ */

.pk-speed-dial {
    position: fixed;
    bottom: var(--pk-space-xl);
    right: var(--pk-space-xl);
    z-index: 50;
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    gap: var(--pk-space-sm);
}

.pk-speed-dial-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    background: var(--pk-primary);
    color: var(--pk-on-primary);
    border: none;
    border-radius: var(--pk-radius);
    cursor: pointer;
    box-shadow: var(--pk-shadow-float);
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-speed-dial-trigger:hover {
    background: var(--pk-primary-container);
}

.pk-speed-dial--open .pk-speed-dial-trigger {
    transform: rotate(45deg);
}

.pk-speed-dial-actions {
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    gap: var(--pk-space-sm);
    opacity: 0;
    transform: scale(0.5);
    pointer-events: none;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-speed-dial--open .pk-speed-dial-actions {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

.pk-speed-dial-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    background: var(--pk-surface-highest);
    color: var(--pk-on-surface);
    border: 1px solid var(--pk-outline-variant);
    border-radius: var(--pk-radius);
    cursor: pointer;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
    position: relative;
}

.pk-speed-dial-action:hover {
    background: var(--pk-surface-bright);
    color: var(--pk-primary);
}

.pk-speed-dial-label {
    position: absolute;
    right: calc(100% + var(--pk-space-sm));
    font-family: var(--pk-font-body);
    font-size: 0.6875rem;
    font-weight: 600;
    white-space: nowrap;
    background: var(--pk-surface-highest);
    color: var(--pk-on-surface);
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--pk-outline-variant);
}


/* ============================================================================
   46. STEPPER (.pk-stepper)
   ============================================================================ */

.pk-stepper {
    display: flex;
    align-items: flex-start;
    gap: 0;
    counter-reset: pk-step;
}

.pk-stepper--vertical {
    flex-direction: column;
}

.pk-step {
    display: flex;
    align-items: center;
    gap: var(--pk-space-sm);
    flex: 1;
    position: relative;
    counter-increment: pk-step;
}

.pk-stepper--vertical .pk-step {
    flex-direction: row;
    align-items: flex-start;
    flex: none;
}

.pk-step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: var(--pk-surface-highest);
    border: 2px solid var(--pk-outline-variant);
    color: var(--pk-outline);
    font-family: var(--pk-font-headline);
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    transition: all var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-step--active .pk-step-indicator {
    background: var(--pk-primary);
    border-color: var(--pk-primary);
    color: var(--pk-on-primary);
}

.pk-step--completed .pk-step-indicator {
    background: var(--pk-surface-bright);
    border-color: var(--pk-on-surface-variant);
    color: var(--pk-primary);
}

.pk-step-content {
    min-width: 0;
}

.pk-step-label {
    font-family: var(--pk-font-headline);
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--pk-outline);
}

.pk-step--active .pk-step-label {
    color: var(--pk-primary);
}

.pk-step--completed .pk-step-label {
    color: var(--pk-on-surface-variant);
}

.pk-step-description {
    font-size: 0.6875rem;
    color: var(--pk-outline);
    margin-top: 0.125rem;
}

.pk-step-connector {
    flex: 1;
    height: 2px;
    background: var(--pk-outline-variant);
    align-self: center;
    margin: 0 var(--pk-space-sm);
    min-width: 1rem;
}

.pk-step--completed + .pk-step-connector,
.pk-step--completed ~ .pk-step-connector {
    background: var(--pk-on-surface-variant);
}

.pk-stepper--vertical .pk-step-connector {
    width: 2px;
    height: 2rem;
    flex: none;
    margin: 0;
    margin-left: calc(1rem - 1px);
}


/* ============================================================================
   47. STACK (.pk-stack)
   ============================================================================ */

.pk-stack {
    display: flex;
    flex-direction: column;
    gap: var(--pk-space-md);
}

.pk-stack--row {
    flex-direction: row;
}

.pk-stack--center {
    align-items: center;
}

.pk-stack--stretch {
    align-items: stretch;
}

.pk-stack--wrap {
    flex-wrap: wrap;
}

.pk-stack--xs { gap: var(--pk-space-xs); }
.pk-stack--sm { gap: var(--pk-space-sm); }
.pk-stack--lg { gap: var(--pk-space-lg); }
.pk-stack--xl { gap: var(--pk-space-xl); }
.pk-stack--2xl { gap: var(--pk-space-2xl); }
.pk-stack--none { gap: 0; }

.pk-stack--dividers > * + * {
    border-top: 1px solid var(--pk-border-subtle);
    padding-top: var(--pk-space-md);
}

.pk-stack--row.pk-stack--dividers > * + * {
    border-top: none;
    padding-top: 0;
    border-left: 1px solid var(--pk-border-subtle);
    padding-left: var(--pk-space-md);
}


/* ============================================================================
   48. IMAGE LIST (.pk-image-list)
   ============================================================================ */

.pk-image-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--pk-space-sm);
}

.pk-image-list--cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.pk-image-list--cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.pk-image-list--cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

.pk-image-list-item {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--pk-border-subtle);
    aspect-ratio: 1;
}

.pk-image-list-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--pk-duration-normal) var(--pk-ease-mechanical);
}

.pk-image-list-item:hover img {
    transform: scale(1.05);
}

.pk-image-list-item-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--pk-space-sm) var(--pk-space-md);
    background: rgba(0, 0, 0, 0.7);
    font-family: var(--pk-font-body);
    font-size: 0.6875rem;
    color: var(--pk-on-surface);
    transform: translateY(100%);
    transition: transform var(--pk-duration-fast) var(--pk-ease-mechanical);
}

.pk-image-list-item:hover .pk-image-list-item-bar {
    transform: translateY(0);
}

.pk-image-list--woven {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
}

.pk-image-list--woven .pk-image-list-item:nth-child(odd) {
    aspect-ratio: 1/1.3;
}

.pk-image-list--woven .pk-image-list-item:nth-child(even) {
    aspect-ratio: 1/0.8;
}


/* ============================================================================
   49. FOCUS VISIBLE — Keyboard accessibility for all interactive elements
   ============================================================================ */

.pk-btn:focus-visible,
.pk-icon-btn:focus-visible,
.pk-fab:focus-visible,
.pk-tab:focus-visible,
.pk-menu-item:focus-visible,
.pk-card--clickable:focus-visible,
.pk-chip--clickable:focus-visible,
.pk-list-item--clickable:focus-visible,
.pk-pagination-item:focus-visible,
.pk-speed-dial-trigger:focus-visible,
.pk-speed-dial-action:focus-visible,
.pk-toggle-btn:focus-visible,
.pk-bottom-nav-item:focus-visible,
.pk-link:focus-visible {
    outline: 2px solid var(--pk-primary);
    outline-offset: 2px;
}


/* ============================================================================
   50. REDUCED MOTION — Accessibility for vestibular disorders
   ============================================================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}