/* ============================================================================
   WEBSHOP – GLOBAL STYLES & CSS INFRASTRUCTURE
   ============================================================================
   
   This file contains:
   - CSS Custom Properties (Design Tokens)
   - Global Styles (Body, Typography)
   - Focus & Accessibility Styles
   - Form Styling (Inputs, Selects, Textareas, Error States)
   - Button Component Styles
   - Tag & Badge Component Styles
   - Loading/Skeleton States
   - Tooltip & Popover Styles
   - Responsive Utilities
   - Dark Mode Support via [data-theme="dark"]
   
   ========================================================================== */

/* ============================================================================
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ========================================================================== */

:root {
    /* ---- Colors – Kasico Art & Design Furry Theme ---- */
    --color-primary: #C0392B;          /* Kasico Crimson Red */
    --color-primary-hover: #9B1B1B;
    --color-primary-dark: #7A1515;
    --color-primary-light: #FAD7D0;

    /* ---- Kasico Brand Tokens ---- */
    --color-gold: #D4A017;
    --color-gold-hover: #B8860B;
    --color-gold-light: #FEF3C7;
    --color-gold-dark: #92690A;
    --color-charcoal: #1A1A1A;
    --color-charcoal-light: #252525;
    --color-charcoal-mid: #2D2D2D;
    --color-cream: #FFF8F0;
    --color-cream-dark: #F5EAD8;
    --color-fur-red: #C0392B;
    --color-fur-dark-red: #7A1515;
    --color-fur-purple: #7B2FBE;
    --color-fur-purple-light: #EDE9FE;

    --color-success: #16a34a;
    --color-success-hover: #15803d;
    --color-success-light: #dcfce7;
    
    --color-danger: #C0392B;
    --color-danger-hover: #9B1B1B;
    --color-danger-light: #FAD7D0;
    
    --color-warning: #D4A017;
    --color-warning-hover: #B8860B;
    --color-warning-light: #FEF3C7;
    
    --color-info: #0891b2;
    --color-info-hover: #0e7490;
    --color-info-light: #cffafe;
    
    /* Neutral Colors */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Semantic Colors */
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #5a5046;
    --color-text-muted: #9ca3af;
    --color-text-inverse: #ffffff;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #FFF8F0;     /* Warm cream */
    --color-bg-tertiary: #F5EAD8;     /* Warm creme-dark */
    
    --color-border: #e5d5c5;
    --color-border-dark: #d1b89a;
    
    /* ---- Spacing ---- */
    --spacing-xs: 0.25rem;      /* 4px */
    --spacing-sm: 0.5rem;       /* 8px */
    --spacing-base: 1rem;       /* 16px */
    --spacing-md: 1.5rem;       /* 24px */
    --spacing-lg: 2rem;         /* 32px */
    --spacing-xl: 2.5rem;       /* 40px */
    --spacing-2xl: 3rem;        /* 48px */
    --spacing-3xl: 4rem;        /* 64px */
    
    /* ---- Border Radius ---- */
    --radius-sm: 0.25rem;       /* 4px */
    --radius-base: 0.375rem;    /* 6px */
    --radius-md: 0.5rem;        /* 8px */
    --radius-lg: 0.75rem;       /* 12px */
    --radius-xl: 1rem;          /* 16px */
    --radius-full: 9999px;      /* Fully rounded */
    
    /* ---- Typography ---- */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* ---- Shadows ---- */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
    
    /* ---- Transitions & Animations ---- */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* ---- Z-Index Scale ---- */
    --z-hide: -1;
    --z-auto: auto;
    --z-base: 0;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ============================================================================
   2. DARK MODE OVERRIDES (Activated with [data-theme="dark"])
   ========================================================================== */

:root[data-theme="dark"] {
    /* Kasico Dark Mode – Charcoal & Warm Tones */
    --color-text-primary: #F0E8D8;    /* Warm cream */
    --color-text-secondary: #C9B99A;
    --color-text-muted: #8a7a68;

    --color-bg-primary: #0D0D0D;
    --color-bg-secondary: #1A1A1A;
    --color-bg-tertiary: #252525;

    --color-border: #3A2A20;
    --color-border-dark: #5A3A28;

    /* Primary stays Kasico red, slightly brighter in dark mode */
    --color-primary: #E74C3C;
    --color-primary-hover: #C0392B;
    --color-primary-light: #4A1515;

    /* Gold brightens slightly in dark mode */
    --color-gold: #F4B942;
    --color-gold-light: #3D2E0A;

    --color-success-light: #15803d;
    --color-danger-light: #7A1515;
    --color-warning-light: #92690A;
    --color-info-light: #0e7490;

    --color-bg-primary: #0D0D0D;
    --color-bg-secondary: #1A1A1A;
    --color-bg-tertiary: #252525;
}

/* ============================================================================
   3. GLOBAL STYLES
   ========================================================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    transition: background-color var(--transition-normal), 
                color var(--transition-normal);
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
}

h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-base);
}

h4 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-base);
}

p {
    margin-bottom: var(--spacing-base);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* ============================================================================
   4. FOCUS & ACCESSIBILITY STYLES
   ========================================================================== */

/* Global focus-visible for all interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-base);
}

/* Don't show focus outline for mouse users (but keep for keyboard) */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
select:focus:not(:focus-visible),
textarea:focus:not(:focus-visible) {
    outline: none;
}

/* Skip-to-content link (hidden by default, visible on focus) */
a.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-base) var(--spacing-md);
    z-index: var(--z-tooltip);
    text-decoration: none;
    border-radius: 0 0 var(--radius-base) 0;
}

a.skip-link:focus-visible {
    top: 0;
    outline: none;
}

/* ============================================================================
   5. FORM ELEMENT STYLES
   ========================================================================== */

/* Form Group Container */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group.is-invalid {
    /* Styling handled on individual inputs */
}

/* Labels */
.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.form-group label[required]::after,
label[aria-required="true"]::after {
    content: " *";
    color: var(--color-danger);
}

/* Base Input Styles */
input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]),
select,
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-base);
    font-family: inherit;
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-base);
    transition: border-color var(--transition-fast),
                box-shadow var(--transition-fast),
                background-color var(--transition-fast);
}

/* Input States */
input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]):hover,
select:hover,
textarea:hover {
    border-color: var(--color-gray-400);
}

input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]):focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Disabled State */
input:disabled,
select:disabled,
textarea:disabled {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-muted);
    cursor: not-allowed;
    opacity: 0.6;
    border-color: var(--color-border);
}

/* Placeholder Styling */
input::placeholder,
textarea::placeholder {
    color: var(--color-text-muted);
}

/* Invalid State */
.form-control.is-invalid,
input.is-invalid,
select.is-invalid,
textarea.is-invalid {
    border-color: var(--color-danger);
    background-color: var(--color-danger-light);
}

:root[data-theme="dark"] .form-control.is-invalid,
:root[data-theme="dark"] input.is-invalid,
:root[data-theme="dark"] select.is-invalid,
:root[data-theme="dark"] textarea.is-invalid {
    background-color: rgba(220, 38, 38, 0.1);
}

.form-control.is-invalid:focus,
input.is-invalid:focus,
select.is-invalid:focus,
textarea.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

/* Form Help Text */
.form-help,
.form-hint {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Form Error Message */
.form-error {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-danger);
    font-weight: var(--font-weight-medium);
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-base);
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: var(--spacing-base);
    cursor: pointer;
    flex-shrink: 0;
    accent-color: var(--color-primary);
}

.form-check label {
    margin-bottom: 0;
    cursor: pointer;
    user-select: none;
}

/* ============================================================================
   6. BUTTON COMPONENT STYLES
   ========================================================================== */

.btn,
button:not([class]) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
    text-align: center;
    cursor: pointer;
    border: none;
    border-radius: var(--radius-base);
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    -webkit-user-select: none;
}

/* Minimum touch target (44px) */
.btn {
    min-height: 44px;
    min-width: 44px;
}

/* Button Variants */

/* Primary Button */
.btn-primary,
.btn.btn-primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover,
.btn.btn-primary:hover {
    background-color: var(--color-primary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-primary:active,
.btn.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-xs);
}

/* Secondary Button */
.btn-secondary,
.btn.btn-secondary {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover,
.btn.btn-secondary:hover {
    background-color: var(--color-border);
    border-color: var(--color-gray-400);
}

/* Success Button */
.btn-success,
.btn.btn-success {
    background-color: var(--color-success);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-success:hover,
.btn.btn-success:hover {
    background-color: var(--color-success-hover);
    box-shadow: var(--shadow-md);
}

/* Danger Button */
.btn-danger,
.btn.btn-danger {
    background-color: var(--color-danger);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover,
.btn.btn-danger:hover {
    background-color: var(--color-danger-hover);
    box-shadow: var(--shadow-md);
}

/* Warning Button */
.btn-warning,
.btn.btn-warning {
    background-color: var(--color-warning);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-warning:hover,
.btn.btn-warning:hover {
    background-color: var(--color-warning-hover);
    box-shadow: var(--shadow-md);
}

/* Ghost Button */
.btn-ghost,
.btn.btn-ghost {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-ghost:hover,
.btn.btn-ghost:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-hover);
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
    min-height: 52px;
}

/* Disabled State */
.btn:disabled,
button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* Button with Loading State */
.btn[data-loading="true"] {
    pointer-events: none;
    opacity: 0.7;
}

.btn[data-loading="true"]::after {
    content: "";
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-left: var(--spacing-sm);
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ============================================================================
   7. TAG & BADGE COMPONENT STYLES
   ========================================================================== */

.tag,
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
}

/* Tag Variants */
.tag-primary {
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.tag-success {
    background-color: var(--color-success-light);
    color: var(--color-success-hover);
}

.tag-danger {
    background-color: var(--color-danger-light);
    color: var(--color-danger-hover);
}

.tag-warning {
    background-color: var(--color-warning-light);
    color: var(--color-warning-hover);
}

.tag-info {
    background-color: var(--color-info-light);
    color: var(--color-info-hover);
}

.tag-gray {
    background-color: var(--color-gray-200);
    color: var(--color-gray-700);
}

/* Dark Mode Tag Variants */
:root[data-theme="dark"] .tag-primary {
    background-color: rgba(37, 99, 235, 0.2);
    color: var(--color-primary);
}

:root[data-theme="dark"] .tag-success {
    background-color: rgba(22, 163, 74, 0.2);
    color: var(--color-success);
}

:root[data-theme="dark"] .tag-danger {
    background-color: rgba(220, 38, 38, 0.2);
    color: var(--color-danger);
}

:root[data-theme="dark"] .tag-warning {
    background-color: rgba(202, 138, 4, 0.2);
    color: var(--color-warning);
}

:root[data-theme="dark"] .tag-info {
    background-color: rgba(8, 145, 178, 0.2);
    color: var(--color-info);
}

:root[data-theme="dark"] .tag-gray {
    background-color: rgba(107, 114, 128, 0.2);
    color: var(--color-gray-300);
}

/* ============================================================================
   8. LOADING & SKELETON STATES
   ========================================================================== */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 0%,
        var(--color-gray-100) 50%,
        var(--color-gray-200) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

:root[data-theme="dark"] .skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-700) 0%,
        var(--color-gray-600) 50%,
        var(--color-gray-700) 100%
    );
}

.skeleton-text {
    height: 1rem;
    border-radius: var(--radius-base);
    margin-bottom: var(--spacing-sm);
}

.skeleton-avatar {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
}

.skeleton-card {
    height: 12rem;
    border-radius: var(--radius-lg);
}

.skeleton-button {
    height: 2.75rem;
    width: 6rem;
    border-radius: var(--radius-base);
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ============================================================================
   9. TOOLTIP & POPOVER STYLES
   ========================================================================== */

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip-content {
    visibility: hidden;
    background-color: var(--color-gray-900);
    color: white;
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-base);
    border-radius: var(--radius-base);
    position: absolute;
    z-index: var(--z-tooltip);
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.tooltip-content::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--color-gray-900) transparent transparent transparent;
}

.tooltip:hover .tooltip-content,
.tooltip:focus-within .tooltip-content {
    visibility: visible;
    opacity: 1;
}

.popover {
    position: relative;
    display: inline-block;
}

.popover-content {
    visibility: hidden;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    position: absolute;
    z-index: var(--z-popover);
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    white-space: normal;
    min-width: 250px;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.popover-content::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--color-bg-primary) transparent transparent transparent;
    border-top-color: var(--color-border);
}

.popover:hover .popover-content,
.popover:focus-within .popover-content {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
}

/* ============================================================================
   10. RESPONSIVE UTILITIES & HELPERS
   ========================================================================== */

/* Touch Target Size (minimum 44x44px for mobile accessibility) */
@media (max-width: 768px) {
    .btn,
    button,
    a[role="button"],
    input[type="checkbox"],
    input[type="radio"] {
        min-height: 44px;
        min-width: 44px;
    }
}

/* Safe Area Support for Notch Devices */
@supports (padding: max(0px)) {
    body {
        padding-left: max(var(--spacing-base), env(safe-area-inset-left));
        padding-right: max(var(--spacing-base), env(safe-area-inset-right));
    }
    
    .header-top {
        padding-top: max(var(--spacing-base), env(safe-area-inset-top));
    }
    
    .footer {
        padding-bottom: max(var(--spacing-base), env(safe-area-inset-bottom));
    }
}

/* Print Styles */
@media print {
    .no-print {
        display: none !important;
    }
    
    a {
        text-decoration: underline;
    }
    
    button,
    input[type="button"],
    input[type="submit"] {
        border: 1px solid;
        padding: var(--spacing-sm) var(--spacing-base);
    }
}

/* ============================================================================
   11. UTILITY CLASSES (for common use cases)
   ========================================================================== */

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

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.line-clamp-1 {
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-left {
    text-align: left;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.cursor-pointer {
    cursor: pointer;
}

/* ============================================================================
   12. ANIMATIONS
   ========================================================================== */

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slide-in-up {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ============================================================================
   13. PRODUCT CARD HOVER-OVERLAY SYSTEM
   ========================================================================== */

.product-card {
    position: relative;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    will-change: transform;
    background: var(--color-bg-primary);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px -8px rgba(0, 0, 0, 0.13), 0 8px 16px -4px rgba(0, 0, 0, 0.07);
}

/* Image wrapper with enforced aspect ratio */
.product-card-img-wrapper {
    position: relative;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--color-gray-100);
}

.product-card-img-wrapper img,
.product-card-img-wrapper .img-placeholder {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
    display: block;
}

.product-card:hover .product-card-img-wrapper img {
    transform: scale(1.06);
}

/* Hover overlay */
.card-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.36);
    opacity: 0;
    transition: opacity 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    z-index: 5;
}

.product-card:hover .card-overlay,
.product-card:focus-within .card-overlay {
    opacity: 1;
}

/* Overlay icon buttons */
.card-overlay-btn {
    width: 2.75rem;
    height: 2.75rem;
    min-width: 2.75rem;
    min-height: 2.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.96);
    color: var(--color-gray-700);
    border: none;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.15s ease, color 0.15s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
    flex-shrink: 0;
    text-decoration: none;
}

.card-overlay-btn:hover,
.card-overlay-btn:focus {
    background: var(--color-bg-primary);
    transform: scale(1.12);
    color: var(--color-primary);
    outline: none;
    text-decoration: none;
}

.card-overlay-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.card-overlay-btn.wishlist-active {
    color: var(--color-danger);
}

.card-overlay-btn.wishlist-active:hover {
    color: var(--color-danger-hover);
}

/* Compact badges */
.badge-discount {
    display: inline-block;
    background: var(--color-danger);
    color: var(--color-text-inverse);
    padding: 0.2rem 0.45rem;
    border-radius: var(--radius-base);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    line-height: 1.4;
}

.badge-stock {
    display: inline-block;
    padding: 0.2rem 0.45rem;
    border-radius: var(--radius-base);
    font-size: 0.68rem;
    font-weight: 600;
    line-height: 1.4;
}

/* ============================================================================
   14. SKELETON LOADER
   ========================================================================== */

@keyframes shimmer {
    0%   { background-position: -700px 0; }
    100% { background-position:  700px 0; }
}

.skeleton-card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.skeleton-block {
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 25%,
        var(--color-gray-200) 37%,
        var(--color-gray-100) 63%
    );
    background-size: 700px 100%;
    animation: shimmer 1.4s linear infinite;
}

/* ============================================================================
   15. DARK MODE TOGGLE BUTTON
   ========================================================================== */

.dark-mode-toggle {
    width: 2.25rem;
    height: 2.25rem;
    min-width: 2.25rem;
    min-height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-gray-600);
    transition: background 0.2s ease, color 0.2s ease;
    flex-shrink: 0;
}

.dark-mode-toggle:hover {
    background: var(--color-gray-100);
    color: var(--color-primary);
}

[data-theme="dark"] .dark-mode-toggle {
    color: var(--color-gray-300);
}

[data-theme="dark"] .dark-mode-toggle:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-warning);
}

/* Show moon in light mode, sun in dark mode */
.dark-mode-toggle [data-dm="sun"]  { display: none; }
.dark-mode-toggle [data-dm="moon"] { display: block; }

[data-theme="dark"] .dark-mode-toggle [data-dm="sun"]  { display: block; }
[data-theme="dark"] .dark-mode-toggle [data-dm="moon"] { display: none; }

/* ============================================================================
   16. MOBILE SEARCH OVERLAY
   ========================================================================== */

.mobile-search-overlay {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg-primary);
    z-index: 9990;
    padding: 0.875rem 1rem;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.11);
    transform: translateY(-10px);
    opacity: 0;
    transition: transform 0.22s ease, opacity 0.22s ease;
    pointer-events: none;
    border-bottom: 1px solid var(--color-border);
}

.mobile-search-overlay.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

/* ============================================================================
   17. NAV SHRINK ON SCROLL
   ========================================================================== */

nav.nav-shrink {
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.07) !important;
}

nav .h-16-transition {
    transition: height 0.2s ease, padding 0.2s ease;
}

/* ============================================================================
   18. ADD-TO-CART FLASH ANIMATION
   ========================================================================== */

@keyframes cart-pop {
    0%   { transform: scale(1); }
    40%  { transform: scale(1.07); }
    100% { transform: scale(1); }
}

.add-to-cart-btn.btn-success-flash {
    animation: cart-pop 0.35s ease;
}

/* ============================================================================
   19. DARK MODE PRODUCT CARD OVERRIDES
   ========================================================================== */

[data-theme="dark"] .product-card {
    border-color: var(--color-border);
}

[data-theme="dark"] .product-card-img-wrapper {
    background: var(--color-bg-tertiary);
}

/* ============================================================================
   END OF MAIN.CSS
   ========================================================================== */