:root {
    --primary-green: #61d37e;
}
body {
    font-family: 'Inter', sans-serif;
    transition: background-color 0.5s ease, color 0.3s ease;
}
.heading-font {
    font-family: 'Roboto', sans-serif;
}
.green-accent {
    color: #61d37e;
}
.bg-green-accent {
    background-color: #61d37e;
}
.border-green-accent {
    border-color: #61d37e;
}

/* Solid backgrounds with smooth transitions (replaces gradients) */
.gradient-bg {
    background-color: #f8fafc; /* light mode */
    transition: background-color 0.5s ease;
}
.dark .gradient-bg {
    background-color: #0f172a; /* dark mode */
}

.research-gradient {
    background-color: #e0f2fe;
    transition: background-color 0.5s ease;
}
.dark .research-gradient {
    background-color: #0c4a6e;
}

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

/* Animation classes */
.fade-in-up {
    opacity: 1;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in-up:not(.animate-in) {
    opacity: 0;
}
.animate-in {
    opacity: 1 !important;
    transform: translateY(0) translateX(0) scale(1);
}

.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }

/* Card hover effects */
.card-hover {
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                box-shadow 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                background-color 0.3s ease;
}
.card-hover:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}
.dark .card-hover:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* Publication tag colors */
.tag-trading { background-color: #3b82f6; color: white; }
.tag-analysis { background-color: #8b5cf6; color: white; }
.tag-research { background-color: #10b981; color: white; }
.tag-forex { background-color: #f59e0b; color: white; }
.tag-crypto { background-color: #ef4444; color: white; }

.dark .tag-trading { background-color: #1d4ed8; }
.dark .tag-analysis { background-color: #7c3aed; }
.dark .tag-research { background-color: #047857; }
.dark .tag-forex { background-color: #d97706; }
.dark .tag-crypto { background-color: #dc2626; }

/* Filter buttons */
.filter-btn {
    transition: all 0.3s ease;
}
.filter-btn.active {
    background-color: #61d37e;
    color: white;
}

/* Dark mode transitions (applied to many elements) */
.dark-transition {
    transition: background-color 0.5s ease,
                color 0.3s ease,
                border-color 0.3s ease,
                fill 0.3s ease;
}

/* Navbar background transition */
.navbar-bg {
    transition: background-color 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.4s ease;
}

/* Loading animation */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Dark mode body */
.dark body {
    background-color: #0f172a;
    color: #e2e8f0;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: #f1f1f1;
}
.dark ::-webkit-scrollbar-track {
    background: #1e293b;
}
::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 5px;
}
.dark ::-webkit-scrollbar-thumb {
    background: #475569;
}
::-webkit-scrollbar-thumb:hover {
    background: #61d37e;
}

/* Theme toggle button */
.theme-toggle {
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.theme-toggle:hover {
    transform: rotate(30deg);
}

/* Underline animation for links */
.link-underline {
    position: relative;
}
.link-underline::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: #61d37e;
    transition: width 0.3s ease;
}
.link-underline:hover::after {
    width: 100%;
}

/* Publication read time indicator */
.read-time::before {
    content: '⏱️';
    margin-right: 5px;
}