/* TODO: Review box-shadow values - consider using design system shadow variables (--shadow-xs, --shadow-sm, etc.) */
/**
 * Visual Polish - Sprint 1
 * Button animations, loading states, visual feedback
 */

/* ============================================
   BUTTON ANIMATIONS
   ============================================ */

/* Base button animation styles */
button,
.btn,
.button,
input[type="button"],
input[type="submit"],
a.button {
    position: relative;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateZ(0); /* Hardware acceleration */
    will-change: transform, box-shadow, background-color;

/* Hover animations */
button:hover:not(:disabled),
.btn:hover:not(:disabled),
.button:hover:not(:disabled),
input[type="button"]:hover:not(:disabled),
input[type="submit"]:hover:not(:disabled),
a.button:hover:not(:disabled) {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 12px rgba(var(--color-bg-primary-rgb, 26, 26, 26), 0.15);

/* Active state animations */
button:active:not(:disabled),
.btn:active:not(:disabled),
.button:active:not(:disabled),
input[type="button"]:active:not(:disabled),
input[type="submit"]:active:not(:disabled),
a.button:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 4px rgba(var(--color-bg-primary-rgb, 26, 26, 26), 0.1);
    transition: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);

/* Disabled state styling */
button:disabled,
.btn:disabled,
.button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;

/* Focus state animations */
button:focus-visible,
.btn:focus-visible,
.button:focus-visible,
input[type="button"]:focus-visible,
input[type="submit"]:focus-visible,
a.button:focus-visible {
    outline: 3px solid var(--color-info, #4a90e2);
    outline-offset: 2px;
    animation: focusPulse 0.3s ease-out;

@keyframes focusPulse {
    0% {
        outline-width: calc(var(--spacing-xs) / 2);
        outline-opacity: 0.5;

    50% {
        outline-width: var(--spacing-sm);
        outline-opacity: 1;

    100% {
        outline-width: calc(var(--spacing-xs) * 0.75);
        outline-opacity: 1;

/* Button type-specific animations */
.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary, #4a90e2) 0%, var(--color-primary-dark, #357abd) 100%);
    box-shadow: 0 4px 16px rgba(74, 144, 226, 0.4);

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-success, #4caf50) 0%, var(--color-success-dark, #45a049) 100%);
    box-shadow: 0 4px 16px rgba(76, 175, 80, 0.4);

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-danger, #f44336) 0%, var(--color-danger-dark, #da190b) 100%);
    box-shadow: 0 4px 16px rgba(244, 67, 54, 0.4);

.btn-warning:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-warning, #ff9800) 0%, var(--color-warning-dark, #f57c00) 100%);
    box-shadow: 0 4px 16px rgba(255, 152, 0, 0.4);

/* ============================================
   LOADING STATES
   ============================================ */

/* Skeleton screens */
.skeleton {
    background: linear-gradient(
        90deg,
        rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.05) 0%,
        rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.1) 50%,
        rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.05) 100%
    );
    background-size: 200% 100%;
    animation: skeletonLoading 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);

@keyframes skeletonLoading {
    0% {
        background-position: 200% 0;

    100% {
        background-position: -200% 0;

.skeleton-text {
    height: 1em;
    margin: 0.5em 0;

.skeleton-title {
    height: 1.5em;
    width: 60%;
    margin-bottom: 1em;

.skeleton-avatar {
    width: var(--spacing-2xl);
    height: var(--spacing-2xl);
    border-radius: var(--radius-full);

.skeleton-button {
    height: calc(var(--spacing-2xl) * 1.25);
    width: 120px;

/* Loading spinner */
.loading-spinner {
    display: inline-block;
    width: calc(var(--spacing-lg) * 1.25);
    height: calc(var(--spacing-lg) * 1.25);
    border: 3px solid rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.3);
    border-top-color: var(--color-info, #4a90e2);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;

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

.loading-spinner-large {
    width: calc(var(--spacing-2xl) * 1.25);
    height: calc(var(--spacing-2xl) * 1.25);
    border-width: var(--spacing-sm);

/* Progress indicators */
.progress-bar {
    width: 100%;
    height: var(--spacing-sm);
    background: rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.1);
    border-radius: var(--radius-xs);
    overflow: hidden;
    position: relative;

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-info, #4a90e2), var(--color-primary, #4a90e2));
    border-radius: var(--radius-xs);
    transition: width 0.3s ease-out;
    position: relative;
    overflow: hidden;

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.3),
        transparent
    );
    animation: progressShine 2s infinite;

@keyframes progressShine {
    0% {
        transform: translateX(-100%);

    100% {
        transform: translateX(100%);

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(var(--color-bg-primary-rgb, 26, 26, 26), 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn 0.2s ease-out;

@keyframes fadeIn {
    from {
        opacity: 0;

    to {
        opacity: 1;

/* ============================================
   VISUAL FEEDBACK
   ============================================ */

/* Success animations */
.success-feedback {
    animation: successPulse 0.5s ease-out;

@keyframes successPulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.7);

    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(76, 175, 80, 0);

    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(76, 175, 80, 0);

/* Error animations */
.error-feedback {
    animation: errorShake 0.5s ease-out;

@keyframes errorShake {
    0%, 100% {
        transform: translateX(0);

    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);

    20%, 40%, 60%, 80% {
        transform: translateX(5px);

/* Status change animations */
.status-change {
    animation: statusChange 0.3s ease-out;

@keyframes statusChange {
    0% {
        opacity: 0.5;
        transform: scale(0.95);

    50% {
        transform: scale(1.05);

    100% {
        opacity: 1;
        transform: scale(1);

/* Action feedback */
.action-feedback {
    position: relative;
    overflow: hidden;

.action-feedback::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: var(--radius-full);
    background: rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;

.action-feedback:active::after {
    width: 304px;
    height: 304px;

/* ============================================
   SMOOTH TRANSITIONS
   ============================================ */

/* Page transitions */
.page-transition {
    animation: pageFadeIn 0.3s ease-out;

@keyframes pageFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);

    to {
        opacity: 1;
        transform: translateY(0);

/* State change transitions */
.state-change {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

/* Card hover effects */
.card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(var(--color-bg-primary-rgb, 26, 26, 26), 0.2);

/* ============================================
   ACCESSIBILITY
   ============================================ */

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    button,
    .btn,
    .button {
        border: 2px solid currentColor;

    .skeleton {
        background: rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.2);

}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}