/* ==========================================================================
   animations.css — Keyframes, Transitions, Skeleton Loading, Ripple Effects
   Property Management CRM
   ========================================================================== */

/* --- Keyframes --- */
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to   { opacity: 0; }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-24px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(24px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes slideInUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideInDown {
    from { opacity: 0; transform: translateY(-16px); }
    to   { opacity: 1; transform: translateY(0); }
}

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

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

@keyframes ripple {
    0%   { transform: scale(0); opacity: 0.5; }
    100% { transform: scale(4); opacity: 0; }
}

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

@keyframes toastSlideIn {
    from { opacity: 0; transform: translateX(100%); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes toastSlideOut {
    from { opacity: 1; transform: translateX(0); }
    to   { opacity: 0; transform: translateX(100%); }
}

/* --- Animation Utility Classes --- */
.fade-in {
    animation: fadeIn var(--transition-base) ease both;
}

.slide-in-left {
    animation: slideInLeft var(--transition-base) ease both;
}

.slide-in-right {
    animation: slideInRight var(--transition-base) ease both;
}

.slide-in-up {
    animation: slideInUp var(--transition-base) ease both;
}

.slide-in-down {
    animation: slideInDown var(--transition-base) ease both;
}

.scale-in {
    animation: scaleIn var(--transition-base) ease both;
}

/* --- Page Transition on Content Area --- */
.content-area {
    animation: fadeIn 300ms ease both;
}

/* --- Skeleton Loading --- */
.skeleton {
    background: linear-gradient(90deg, #e1e8ed 25%, #f0f3f5 50%, #e1e8ed 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 14px;
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-sm);
    background: linear-gradient(90deg, #e1e8ed 25%, #f0f3f5 50%, #e1e8ed 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-text:last-child {
    width: 60%;
}

.skeleton-card {
    height: 120px;
    border-radius: var(--radius-md);
    background: linear-gradient(90deg, #e1e8ed 25%, #f0f3f5 50%, #e1e8ed 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, #e1e8ed 25%, #f0f3f5 50%, #e1e8ed 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* --- Button Ripple Effect --- */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::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) 10%, transparent 10.01%);
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
    transition: transform 0.5s, opacity 0.3s;
}

.btn:active::after {
    transform: translate(-50%, -50%) scale(4);
    opacity: 0;
    transition: 0s;
}

/* --- Spinner --- */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.spinner-lg {
    width: 36px;
    height: 36px;
    border-width: 3px;
}

/* --- Loading Overlay --- */
.loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.7);
    z-index: 10;
    border-radius: inherit;
}

/* --- Staggered Animation Delays --- */
.stagger-1 { animation-delay: 50ms; }
.stagger-2 { animation-delay: 100ms; }
.stagger-3 { animation-delay: 150ms; }
.stagger-4 { animation-delay: 200ms; }
.stagger-5 { animation-delay: 250ms; }