/* Fade In Animation */
.fade-in {
    opacity: 0;
    transition: opacity 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
}

/* Page Load Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-enter {
    animation: fadeInUp 0.5s ease-out;
}

/* Hover Animations */
.hover-lift {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

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

.theme-toggle-pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* Smooth Expand/Collapse */
.expandable {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.expandable.expanded {
    max-height: 2000px;
    transition: max-height 0.5s ease-in;
}

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

.spinner {
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top-color: #3b82f6;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

/* Button Hover Effects */
.btn-primary {
    @apply bg-blue-600 hover:bg-blue-700 text-white font-semibold py-2 px-4 rounded-lg transition-all duration-200;
    transform: scale(1);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.btn-primary:active {
    transform: scale(0.98);
}

/* Card Hover Effects */
.card-hover {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

/* Stagger Animation for Lists */
.stagger-item {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.stagger-item:nth-child(1) { transition-delay: 0.1s; }
.stagger-item:nth-child(2) { transition-delay: 0.2s; }
.stagger-item:nth-child(3) { transition-delay: 0.3s; }
.stagger-item:nth-child(4) { transition-delay: 0.4s; }
.stagger-item:nth-child(5) { transition-delay: 0.5s; }

/* Enhanced fade-in with stagger */
.fade-in {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
}

.fade-in.visible {
    opacity: 1;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Glass morphism effect */
.glass-effect {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

/* Smooth hover lift effect */
.hover-lift-smooth {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
}

.hover-lift-smooth:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

/* Timeline item stagger animation */
.fade-in:nth-child(1) {
    animation-delay: 0.1s;
}

.fade-in:nth-child(2) {
    animation-delay: 0.2s;
}

.fade-in:nth-child(3) {
    animation-delay: 0.3s;
}

.fade-in:nth-child(4) {
    animation-delay: 0.4s;
}

/* Expandable content animation */
.expandable-content {
    max-height: 0;
    opacity: 0;
    transition: max-height 0.4s ease-out, opacity 0.3s ease-out, padding 0.3s ease-out;
    padding-top: 0;
}

.expandable-content:not(.hidden) {
    max-height: 1000px;
    opacity: 1;
    padding-top: 1rem;
    transition: max-height 0.5s ease-in, opacity 0.4s ease-in, padding 0.4s ease-in;
}

.timeline-item.expanded .expandable-content {
    max-height: 1000px;
    opacity: 1;
}

/* Enhanced Timeline Item Styles */
.timeline-item {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.timeline-item:hover {
    transform: translateY(-2px);
}

.timeline-item.group:hover {
    border-color: rgba(59, 130, 246, 0.2);
}

/* Improved expandable content animation */
.expandable-content {
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                opacity 0.3s ease-out,
                padding 0.3s ease-out;
}

/* Better badge styling */
.timeline-item .rounded-lg {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.timeline-item:hover .rounded-lg {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}


/* Screen reader only */
.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;
}

.sr-only.focus\:not-sr-only:focus {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Smooth expand/collapse animation */
.expandable-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.3s ease-out,
                padding 0.3s ease-out;
    padding-top: 0;
    padding-bottom: 0;
}

.expandable-content:not(.hidden) {
    max-height: 2000px;
    opacity: 1;
    padding-top: 2rem;
    padding-bottom: 0;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.4s ease-in,
                padding 0.4s ease-in;
}

/* Back to top button */
#back-to-top {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

#back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

/* Mobile menu animation */
#mobile-menu {
    transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
}

#mobile-menu.open {
    max-height: 500px;
    opacity: 1;
}

/* Focus states for better accessibility */
*:focus-visible {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

/* Improved nav link active state */
.nav-link.active {
    color: #2563eb;
    font-weight: 600;
    position: relative;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(to right, #3b82f6, #8b5cf6);
    border-radius: 2px;
}