/* =====================================================================
   MealWeek Animation System
   Version: 1.0.0

   Centralized animation definitions for microinteractions.
   Based on Work Item #773 specifications.

   Table of Contents:
   1. Animation Custom Properties
   2. Keyframe Definitions
   3. Button Animations
   4. Card Animations
   5. Modal & Dialog Animations
   6. Toast & Notification Animations
   7. Skeleton Loading Animations
   8. Page Transition Animations
   9. Utility Animation Classes
   10. Reduced Motion Support
   ===================================================================== */


/* =====================================================================
   1. ANIMATION CUSTOM PROPERTIES
   ===================================================================== */

:root {
    /* Duration Tokens */
    --mw-animation-instant: 0ms;
    --mw-animation-fast: 100ms;
    --mw-animation-normal: 200ms;
    --mw-animation-slow: 300ms;
    --mw-animation-slower: 400ms;
    --mw-animation-skeleton: 1500ms;

    /* Easing Functions */
    --mw-easing-standard: cubic-bezier(0.4, 0, 0.2, 1);
    --mw-easing-decelerate: cubic-bezier(0, 0, 0.2, 1);
    --mw-easing-accelerate: cubic-bezier(0.4, 0, 1, 1);
    --mw-easing-sharp: cubic-bezier(0.4, 0, 0.6, 1);
    --mw-easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --mw-easing-spring: cubic-bezier(0.2, 0.8, 0.2, 1);

    /* Composite Animation Presets */
    --mw-animate-fast: var(--mw-animation-fast) var(--mw-easing-standard);
    --mw-animate-normal: var(--mw-animation-normal) var(--mw-easing-standard);
    --mw-animate-slow: var(--mw-animation-slow) var(--mw-easing-standard);
}


/* =====================================================================
   2. KEYFRAME DEFINITIONS
   ===================================================================== */

/* --- Fade Animations --- */
@keyframes mw-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes mw-fade-in-up {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes mw-fade-in-down {
    from {
        opacity: 0;
        transform: translateY(-16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes mw-fade-in-left {
    from {
        opacity: 0;
        transform: translateX(-16px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes mw-fade-in-right {
    from {
        opacity: 0;
        transform: translateX(16px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* --- Scale Animations --- */
@keyframes mw-scale-in {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes mw-scale-out {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.9);
    }
}

@keyframes mw-scale-up {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* --- Slide Animations --- */
@keyframes mw-slide-in-up {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

@keyframes mw-slide-out-down {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(100%);
    }
}

@keyframes mw-slide-in-right {
    from {
        transform: translateX(100%);
    }
    to {
        transform: translateX(0);
    }
}

@keyframes mw-slide-out-right {
    from {
        transform: translateX(0);
    }
    to {
        transform: translateX(100%);
    }
}

@keyframes mw-slide-in-left {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

/* --- Special Effect Animations --- */
@keyframes mw-shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
    20%, 40%, 60%, 80% { transform: translateX(4px); }
}

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

@keyframes mw-bounce {
    0%, 100% {
        transform: translateY(0);
        animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
    }
    50% {
        transform: translateY(-8px);
        animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
    }
}

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

@keyframes mw-ripple {
    0% {
        transform: scale(0);
        opacity: 0.5;
    }
    100% {
        transform: scale(2.5);
        opacity: 0;
    }
}

@keyframes mw-checkmark {
    0% {
        stroke-dashoffset: 24;
    }
    100% {
        stroke-dashoffset: 0;
    }
}

@keyframes mw-confetti-fall {
    0% {
        transform: translateY(-100%) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}


/* =====================================================================
   3. BUTTON ANIMATIONS
   ===================================================================== */

/* Base animated button */
.mw-btn-animated {
    position: relative;
    overflow: hidden;
    transition: transform var(--mw-animation-fast) var(--mw-easing-standard),
                background-color var(--mw-animation-normal) var(--mw-easing-standard),
                box-shadow var(--mw-animation-normal) var(--mw-easing-standard);
}

/* Press state */
.mw-btn-animated:active {
    transform: scale(0.95);
}

/* Hover state (pointer devices only) */
@media (hover: hover) and (pointer: fine) {
    .mw-btn-animated:hover {
        transform: translateY(-1px);
    }

    .mw-btn-animated:hover:active {
        transform: scale(0.95);
    }
}

/* Ripple effect container */
.mw-btn-ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: scale(0);
    animation: mw-ripple var(--mw-animation-slower) var(--mw-easing-decelerate);
    pointer-events: none;
}

/* Loading state */
.mw-btn-loading {
    pointer-events: none;
    cursor: wait;
}

.mw-btn-loading .mw-btn-content {
    opacity: 0;
}

.mw-btn-loading .mw-btn-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.mw-btn-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: mw-spin 0.8s linear infinite;
}

/* Success state */
.mw-btn-success {
    background-color: var(--mw-color-success) !important;
    transition: background-color var(--mw-animation-fast) var(--mw-easing-standard);
}

.mw-btn-success .mw-btn-content {
    opacity: 0;
}

.mw-btn-success .mw-btn-checkmark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
}

.mw-btn-checkmark svg {
    stroke: currentColor;
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
    stroke-dasharray: 24;
    stroke-dashoffset: 24;
    animation: mw-checkmark var(--mw-animation-normal) var(--mw-easing-decelerate) forwards;
}

/* Error state with shake */
.mw-btn-error {
    animation: mw-shake var(--mw-animation-slower) var(--mw-easing-standard);
}


/* =====================================================================
   4. CARD ANIMATIONS
   ===================================================================== */

/* Animated card base */
.mw-card-animated {
    transition: transform var(--mw-animation-normal) var(--mw-easing-standard),
                box-shadow var(--mw-animation-normal) var(--mw-easing-standard);
}

/* Hover lift effect (pointer devices only) */
@media (hover: hover) and (pointer: fine) {
    .mw-card-animated:hover {
        transform: translateY(-2px);
        box-shadow: var(--mw-shadow-lg);
    }
}

/* Tap/active state */
.mw-card-animated:active {
    transform: scale(0.98);
}

/* Card entrance animation */
.mw-card-enter {
    animation: mw-fade-in-up var(--mw-animation-slow) var(--mw-easing-decelerate);
}

/* Staggered entrance for card grids */
.mw-card-stagger:nth-child(1) { animation-delay: 0ms; }
.mw-card-stagger:nth-child(2) { animation-delay: 50ms; }
.mw-card-stagger:nth-child(3) { animation-delay: 100ms; }
.mw-card-stagger:nth-child(4) { animation-delay: 150ms; }
.mw-card-stagger:nth-child(5) { animation-delay: 200ms; }
.mw-card-stagger:nth-child(6) { animation-delay: 250ms; }
.mw-card-stagger:nth-child(7) { animation-delay: 300ms; }
.mw-card-stagger:nth-child(8) { animation-delay: 350ms; }

/* Card exit animation */
.mw-card-exit {
    animation: mw-fade-out var(--mw-animation-normal) var(--mw-easing-accelerate);
}

/* Card collapse (for removal) */
.mw-card-collapse {
    animation: mw-fade-out var(--mw-animation-normal) var(--mw-easing-accelerate),
               mw-slide-out-right var(--mw-animation-normal) var(--mw-easing-accelerate);
}


/* =====================================================================
   5. MODAL & DIALOG ANIMATIONS
   ===================================================================== */

/* Backdrop */
.mw-backdrop {
    background-color: rgba(38, 50, 56, 0.5);
    animation: mw-fade-in var(--mw-animation-normal) var(--mw-easing-standard);
}

.mw-backdrop-exit {
    animation: mw-fade-out var(--mw-animation-normal) var(--mw-easing-standard);
}

/* Modal container */
.mw-modal-enter {
    animation: mw-scale-up 250ms var(--mw-easing-standard);
}

.mw-modal-exit {
    animation: mw-scale-out var(--mw-animation-normal) var(--mw-easing-accelerate);
}

/* Bottom sheet */
.mw-bottom-sheet {
    animation: mw-slide-in-up var(--mw-animation-slow) var(--mw-easing-decelerate);
}

.mw-bottom-sheet-exit {
    animation: mw-slide-out-down var(--mw-animation-slow) var(--mw-easing-accelerate);
}

/* Side drawer */
.mw-drawer-right {
    animation: mw-slide-in-right var(--mw-animation-slow) var(--mw-easing-decelerate);
}

.mw-drawer-right-exit {
    animation: mw-slide-out-right var(--mw-animation-slow) var(--mw-easing-accelerate);
}

.mw-drawer-left {
    animation: mw-slide-in-left var(--mw-animation-slow) var(--mw-easing-decelerate);
}


/* =====================================================================
   6. TOAST & NOTIFICATION ANIMATIONS
   ===================================================================== */

/* Toast container positioning */
.mw-toast-container {
    position: fixed;
    z-index: var(--mw-z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--mw-spacing-2);
    max-width: 400px;
    pointer-events: none;
}

.mw-toast-container-top {
    top: var(--mw-spacing-4);
    left: 50%;
    transform: translateX(-50%);
}

.mw-toast-container-top-right {
    top: var(--mw-spacing-4);
    right: var(--mw-spacing-4);
    transform: none;
}

.mw-toast-container-bottom {
    bottom: var(--mw-spacing-4);
    left: 50%;
    transform: translateX(-50%);
}

.mw-toast-container-bottom-right {
    bottom: var(--mw-spacing-4);
    right: var(--mw-spacing-4);
    transform: none;
}

/* Toast item */
.mw-toast {
    pointer-events: auto;
    background: var(--mw-color-surface);
    border-radius: var(--mw-radius-lg);
    box-shadow: var(--mw-shadow-lg);
    padding: var(--mw-spacing-3) var(--mw-spacing-4);
    display: flex;
    align-items: center;
    gap: var(--mw-spacing-3);
    animation: mw-fade-in-down var(--mw-animation-slow) var(--mw-easing-decelerate);
}

.mw-toast-exit {
    animation: mw-fade-out var(--mw-animation-normal) var(--mw-easing-accelerate);
}

/* Toast variants */
.mw-toast-success {
    border-left: 4px solid var(--mw-color-success);
}

.mw-toast-error {
    border-left: 4px solid var(--mw-color-error);
}

.mw-toast-warning {
    border-left: 4px solid var(--mw-color-warning);
}

.mw-toast-info {
    border-left: 4px solid var(--mw-color-info);
}

/* Toast icon */
.mw-toast-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
}

.mw-toast-success .mw-toast-icon {
    color: var(--mw-color-success);
}

.mw-toast-error .mw-toast-icon {
    color: var(--mw-color-error);
}

.mw-toast-warning .mw-toast-icon {
    color: var(--mw-color-warning);
}

.mw-toast-info .mw-toast-icon {
    color: var(--mw-color-info);
}

/* Toast content */
.mw-toast-content {
    flex: 1;
    min-width: 0;
}

.mw-toast-title {
    font-weight: var(--mw-font-weight-semibold);
    font-size: var(--mw-font-size-body);
    color: var(--mw-color-text-primary);
    margin: 0;
}

.mw-toast-message {
    font-size: var(--mw-font-size-body-small);
    color: var(--mw-color-text-secondary);
    margin: 0;
}

/* Toast dismiss button */
.mw-toast-dismiss {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border: none;
    background: transparent;
    color: var(--mw-color-text-secondary);
    cursor: pointer;
    border-radius: var(--mw-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--mw-animation-fast) var(--mw-easing-standard);
}

.mw-toast-dismiss:hover {
    background-color: var(--mw-color-hover);
}

/* Toast progress bar (auto-dismiss timer) */
.mw-toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--mw-color-primary);
    border-radius: 0 0 0 var(--mw-radius-lg);
    animation: mw-progress-shrink linear forwards;
}

@keyframes mw-progress-shrink {
    from { width: 100%; }
    to { width: 0%; }
}


/* =====================================================================
   7. SKELETON LOADING ANIMATIONS
   ===================================================================== */

/* Base skeleton styles */
.mw-skeleton {
    background: linear-gradient(
        90deg,
        var(--mw-color-neutral-light) 0%,
        rgba(255, 255, 255, 0.5) 50%,
        var(--mw-color-neutral-light) 100%
    );
    background-size: 200% 100%;
    animation: mw-skeleton-shimmer var(--mw-animation-skeleton) ease-in-out infinite;
    border-radius: var(--mw-radius-sm);
}

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

/* Dark mode skeleton */
.mud-theme-dark .mw-skeleton {
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.05) 0%,
        rgba(255, 255, 255, 0.1) 50%,
        rgba(255, 255, 255, 0.05) 100%
    );
    background-size: 200% 100%;
}

/* Skeleton shape variants */
.mw-skeleton-text {
    height: 1em;
    margin-bottom: var(--mw-spacing-2);
}

.mw-skeleton-text:last-child {
    width: 80%;
}

.mw-skeleton-title {
    height: 1.5em;
    width: 60%;
    margin-bottom: var(--mw-spacing-3);
}

.mw-skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.mw-skeleton-avatar-lg {
    width: 64px;
    height: 64px;
    border-radius: 50%;
}

.mw-skeleton-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--mw-radius-md);
}

.mw-skeleton-button {
    height: var(--mw-button-height);
    width: 120px;
    border-radius: var(--mw-radius-button);
}

.mw-skeleton-card {
    height: 200px;
    border-radius: var(--mw-radius-card);
}

/* Skeleton pulse animation (alternative to shimmer) */
.mw-skeleton-pulse {
    background: var(--mw-color-neutral-light);
    animation: mw-pulse var(--mw-animation-skeleton) ease-in-out infinite;
}


/* =====================================================================
   8. PAGE TRANSITION ANIMATIONS
   ===================================================================== */

/* Page container for transitions */
.mw-page-transition {
    animation: mw-page-enter var(--mw-animation-slow) var(--mw-easing-decelerate);
}

@keyframes mw-page-enter {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Page exit */
.mw-page-exit {
    animation: mw-page-leave var(--mw-animation-normal) var(--mw-easing-accelerate);
}

@keyframes mw-page-leave {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-8px);
    }
}

/* Slide page transitions */
.mw-page-slide-left {
    animation: mw-slide-in-left var(--mw-animation-slow) var(--mw-easing-decelerate);
}

.mw-page-slide-right {
    animation: mw-slide-in-right var(--mw-animation-slow) var(--mw-easing-decelerate);
}


/* =====================================================================
   9. UTILITY ANIMATION CLASSES
   ===================================================================== */

/* Animation delay utilities */
.mw-delay-100 { animation-delay: 100ms; }
.mw-delay-200 { animation-delay: 200ms; }
.mw-delay-300 { animation-delay: 300ms; }
.mw-delay-400 { animation-delay: 400ms; }
.mw-delay-500 { animation-delay: 500ms; }

/* Animation duration utilities */
.mw-duration-fast { animation-duration: var(--mw-animation-fast) !important; }
.mw-duration-normal { animation-duration: var(--mw-animation-normal) !important; }
.mw-duration-slow { animation-duration: var(--mw-animation-slow) !important; }

/* Animation iteration utilities */
.mw-animate-once { animation-iteration-count: 1 !important; }
.mw-animate-infinite { animation-iteration-count: infinite !important; }

/* Animation fill mode utilities */
.mw-animate-forwards { animation-fill-mode: forwards !important; }
.mw-animate-backwards { animation-fill-mode: backwards !important; }
.mw-animate-both { animation-fill-mode: both !important; }

/* Entrance animations (utility classes) */
.mw-enter-fade { animation: mw-fade-in var(--mw-animation-normal) var(--mw-easing-standard); }
.mw-enter-fade-up { animation: mw-fade-in-up var(--mw-animation-slow) var(--mw-easing-decelerate); }
.mw-enter-fade-down { animation: mw-fade-in-down var(--mw-animation-slow) var(--mw-easing-decelerate); }
.mw-enter-scale { animation: mw-scale-in var(--mw-animation-normal) var(--mw-easing-standard); }
.mw-enter-slide-up { animation: mw-slide-in-up var(--mw-animation-slow) var(--mw-easing-decelerate); }

/* Special effects (utility classes) */
.mw-shake { animation: mw-shake var(--mw-animation-slower) var(--mw-easing-standard); }
.mw-pulse { animation: mw-pulse var(--mw-animation-skeleton) ease-in-out infinite; }
.mw-bounce { animation: mw-bounce 1s infinite; }
.mw-spin { animation: mw-spin 1s linear infinite; }

/* Hover transition helper */
.mw-hover-lift {
    transition: transform var(--mw-animation-normal) var(--mw-easing-standard),
                box-shadow var(--mw-animation-normal) var(--mw-easing-standard);
}

@media (hover: hover) and (pointer: fine) {
    .mw-hover-lift:hover {
        transform: translateY(-2px);
    }
}

/* Active/press transition helper */
.mw-press-scale {
    transition: transform var(--mw-animation-fast) var(--mw-easing-standard);
}

.mw-press-scale:active {
    transform: scale(0.95);
}

/* will-change optimization (use sparingly) */
.mw-will-change-transform {
    will-change: transform;
}

.mw-will-change-opacity {
    will-change: opacity;
}


/* =====================================================================
   10. REDUCED MOTION SUPPORT
   ===================================================================== */

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

    /* Override skeleton shimmer - show static background */
    .mw-skeleton {
        animation: none !important;
        background: var(--mw-color-neutral-light) !important;
    }

    .mud-theme-dark .mw-skeleton {
        background: rgba(255, 255, 255, 0.08) !important;
    }

    /* Keep essential state indicators visible */
    .mw-btn-spinner {
        animation: mw-spin 0.8s linear infinite !important;
    }

    /* Ensure toast still appears but without animation */
    .mw-toast {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }

    /* Page transitions - instant */
    .mw-page-transition,
    .mw-page-exit,
    .mw-page-slide-left,
    .mw-page-slide-right {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }

    /* Card animations - instant */
    .mw-card-enter,
    .mw-card-exit,
    .mw-card-stagger {
        animation: none !important;
        animation-delay: 0ms !important;
        opacity: 1 !important;
    }

    /* Modal animations - instant */
    .mw-modal-enter,
    .mw-modal-exit,
    .mw-backdrop,
    .mw-backdrop-exit,
    .mw-bottom-sheet,
    .mw-bottom-sheet-exit {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}