/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: linear-gradient(180deg, #0f172a, #1e293b);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #0ea5e9, #8b5cf6);
    border-radius: 5px;
    border: 2px solid #1e293b;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #38bdf8, #a78bfa);
    box-shadow: 0 0 10px rgba(14, 165, 233, 0.5);
}

/* Smooth transitions */
* {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

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

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(14, 165, 233, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(14, 165, 233, 0.6);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.float-animation {
    animation: float 3s ease-in-out infinite;
}

/* Glass morphism effect */
.glass {
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(12px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.glass-dark {
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(16px) saturate(200%);
    border: 1px solid rgba(148, 163, 184, 0.1);
}

/* Hover glow effect */
.hover-glow:hover {
    box-shadow: 0 10px 30px rgba(14, 165, 233, 0.4);
    transform: translateY(-5px);
}

/* Gradient text animation */
.gradient-text {
    background: linear-gradient(90deg, #0ea5e9, #8b5cf6, #ec4899, #0ea5e9);
    background-size: 300% 300%;
    animation: gradientShift 4s ease infinite;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Shimmer effect */
.shimmer {
    background: linear-gradient(90deg, 
        rgba(255,255,255,0) 0%, 
        rgba(255,255,255,0.1) 50%, 
        rgba(255,255,255,0) 100%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

/* Custom button styles */
.btn-primary {
    background: linear-gradient(135deg, #0ea5e9, #8b5cf6);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(14, 165, 233, 0.4);
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -60%;
    width: 20%;
    height: 200%;
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(30deg);
    transition: all 0.5s;
}

.btn-primary:hover::after {
    left: 140%;
}

/* Card styles */
.subject-card {
    background: linear-gradient(145deg, #1e293b, #0f172a);
    border-radius: 1.25rem;
    padding: 1.5rem;
    border: 1px solid rgba(148, 163, 184, 0.1);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #0ea5e9, #8b5cf6);
    opacity: 0;
    transition: opacity 0.3s;
}

.subject-card:hover::before {
    opacity: 1;
}

/* Stats counter animation */
.stat-number {
    font-feature-settings: "tnum";
    font-variant-numeric: tabular-nums;
}

/* Loading skeleton */
.skeleton {
    background: linear-gradient(90deg, #1e293b 25%, #334155 50%, #1e293b 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 0.5rem;
}

/* Particle background */
.particle-bg {
    position: relative;
    overflow: hidden;
}

.particle-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* Responsive improvements */
@media (max-width: 768px) {
    .glass {
        backdrop-filter: blur(8px);
    }
    
    .subject-card {
        padding: 1rem;
    }
}

/* Print styles */
@media print {
    .glass, .subject-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}