/* =====================================================
   ANIMATIONS - Smooth Transitions & Keyframes
   ===================================================== */

/* ============ KEYFRAME ANIMATIONS ============ */

/* Gradient background shift */
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

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

/* Shimmer effect for progress bars */
@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Modal slide in */
@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Toast slide in from right */
@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Fade in */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Fade in up */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade in down */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

/* Bounce */
@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Glow effect */
@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 5px var(--primary), 0 0 10px var(--primary);
    }
    50% {
        box-shadow: 0 0 10px var(--primary), 0 0 20px var(--primary), 0 0 30px var(--primary);
    }
}

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

/* Ripple effect */
@keyframes ripple {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

/* ============ ANIMATION CLASSES ============ */

/* Fade animations */
.fade-in {
    animation: fadeIn 0.3s ease;
}

.fade-in-up {
    animation: fadeInUp 0.4s ease;
}

.fade-in-down {
    animation: fadeInDown 0.4s ease;
}

/* Scale animations */
.scale-in {
    animation: scaleIn 0.3s ease;
}

/* Loading states */
.pulse {
    animation: pulse 1.5s ease-in-out infinite;
}

.bounce {
    animation: bounce 1s ease-in-out infinite;
}

/* Skeleton loader */
.skeleton {
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.05) 25%,
        rgba(255, 255, 255, 0.1) 50%,
        rgba(255, 255, 255, 0.05) 75%
    );
    background-size: 200% 100%;
    animation: skeleton 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

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

.skeleton-title {
    height: 1.5rem;
    width: 60%;
    margin-bottom: var(--spacing-md);
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

/* ============ PAGE TRANSITIONS ============ */

/* Page content animations */
.page-transition-enter {
    animation: fadeInUp 0.4s ease;
}

.page-transition-exit {
    animation: fadeIn 0.2s ease reverse;
}

/* ============ HOVER EFFECTS ============ */

/* Card lift on hover */
.hover-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.4);
}

/* Glow on hover */
.hover-glow {
    transition: box-shadow var(--transition-base);
}

.hover-glow:hover {
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}

/* Scale on hover */
.hover-scale {
    transition: transform var(--transition-fast);
}

.hover-scale:hover {
    transform: scale(1.05);
}

/* Rotate on hover */
.hover-rotate {
    transition: transform var(--transition-base);
}

.hover-rotate:hover {
    transform: rotate(5deg);
}

/* ============ SMOOTH SCROLL ============ */

html {
    scroll-behavior: smooth;
}

/* Hide scrollbar but keep functionality */
.hide-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.hide-scrollbar::-webkit-scrollbar {
    display: none;
}

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

/* Button loading state */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    color: white;
}

/* ============ STAGGER ANIMATIONS ============ */

/* Stagger children animations */
.stagger-children > * {
    animation: fadeInUp 0.4s ease;
}

.stagger-children > *:nth-child(1) {
    animation-delay: 0s;
}

.stagger-children > *:nth-child(2) {
    animation-delay: 0.05s;
}

.stagger-children > *:nth-child(3) {
    animation-delay: 0.1s;
}

.stagger-children > *:nth-child(4) {
    animation-delay: 0.15s;
}

.stagger-children > *:nth-child(5) {
    animation-delay: 0.2s;
}

.stagger-children > *:nth-child(6) {
    animation-delay: 0.25s;
}

.stagger-children > *:nth-child(7) {
    animation-delay: 0.3s;
}

.stagger-children > *:nth-child(8) {
    animation-delay: 0.35s;
}

/* ============ SCROLL REVEAL ============ */

/* Elements that fade in on scroll */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ============ PROGRESS ANIMATIONS ============ */

/* Animated progress bar fill */
.progress-fill-animated {
    animation: progressSlide 1.5s ease;
}

@keyframes progressSlide {
    from {
        width: 0;
    }
}

/* ============ RIPPLE EFFECT ============ */

.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 50%;
    left: 50%;
    pointer-events: none;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
}

.ripple:active::after {
    animation: ripple 0.6s ease-out;
}

/* ============ FLIP CARD ============ */

.flip-card {
    perspective: 1000px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

.flip-card-back {
    transform: rotateY(180deg);
}

/* ============ NOTIFICATION DOT ============ */

.notification-dot {
    position: relative;
}

.notification-dot::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 8px;
    height: 8px;
    background: var(--danger);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
    animation: pulse 2s ease-in-out infinite;
}

/* ============ TYPING INDICATOR ============ */

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-md);
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(1) {
    animation-delay: 0s;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-10px);
    }
}

/* ============ REDUCE MOTION ============ */

/* Respect user's motion preferences */
@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;
    }
}

/* ============ ENTRANCE DELAYS ============ */

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }