/* DeltaVerse Learning - Premium Dark Blue Theme with Lighting Effects */

/* Animated Background with Lighting */
* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

body {
    position: relative;
    overflow-x: hidden;
    background: #0f172a !important; /* Dark blue base color */
    background-color: #0f172a !important;
    min-height: 100vh;
    color: white;
    font-family: 'Inter', 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-weight: 400;
    letter-spacing: -0.01em;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', 'Inter', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.gradient-text {
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
}

button, .btn-primary {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    letter-spacing: 0.01em;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(99, 102, 241, 0.2) 0%, transparent 50%),
        linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    z-index: -2;
    animation: backgroundShift 20s ease infinite;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20% 30%, rgba(255, 255, 255, 0.15), transparent),
        radial-gradient(2px 2px at 60% 70%, rgba(255, 255, 255, 0.1), transparent),
        radial-gradient(1px 1px at 50% 50%, rgba(255, 255, 255, 0.2), transparent),
        radial-gradient(1px 1px at 80% 10%, rgba(255, 255, 255, 0.15), transparent),
        radial-gradient(2px 2px at 90% 40%, rgba(255, 255, 255, 0.1), transparent),
        radial-gradient(1px 1px at 33% 60%, rgba(255, 255, 255, 0.1), transparent),
        radial-gradient(2px 2px at 10% 80%, rgba(255, 255, 255, 0.15), transparent);
    background-size: 200% 200%;
    background-position: 0% 0%, 100% 100%, 50% 50%, 100% 0%, 0% 100%, 50% 50%, 0% 0%;
    z-index: -1;
    animation: particleMove 30s linear infinite;
    opacity: 0.6;
}

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

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

/* Premium Glass Card Effect */
.glass-card {
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: 
        0 8px 32px 0 rgba(31, 38, 135, 0.37),
        inset 0 1px 0 rgba(255, 255, 255, 0.1),
        0 0 40px rgba(59, 130, 246, 0.1);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.glass-card:hover::before {
    left: 100%;
}

.glass-card:hover {
    background: rgba(15, 23, 42, 0.5);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 12px 48px 0 rgba(31, 38, 135, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.15),
        0 0 60px rgba(59, 130, 246, 0.2);
    transform: translateY(-5px);
}

/* Enhanced Animations */
@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slide-up {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes slide-in-right {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(59, 130, 246, 0.6);
    }
}

.animate-fade-in {
    animation: fade-in 0.8s ease-out;
}

.animate-slide-up {
    animation: slide-up 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-slide-in-right {
    animation: slide-in-right 0.6s ease-out;
}

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

/* Premium Input Styles */
input, textarea, select {
    background: rgba(15, 23, 42, 0.6) !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    color: white !important;
    transition: all 0.3s ease;
}

input:focus, textarea:focus, select:focus {
    background: rgba(15, 23, 42, 0.8) !important;
    border-color: rgba(59, 130, 246, 0.6) !important;
    box-shadow: 
        0 0 0 3px rgba(59, 130, 246, 0.1),
        0 0 20px rgba(59, 130, 246, 0.2) !important;
    outline: none !important;
}

input::placeholder, textarea::placeholder {
    color: rgba(255, 255, 255, 0.4) !important;
}

/* Premium Button Styles */
.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        0 4px 15px rgba(59, 130, 246, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    box-shadow: 
        0 6px 20px rgba(59, 130, 246, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.5);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.6), rgba(99, 102, 241, 0.6));
    border-radius: 10px;
    border: 2px solid rgba(15, 23, 42, 0.5);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.8), rgba(99, 102, 241, 0.8));
}

/* Line clamp utility */
.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Tab button active state */
.tab-button.active {
    color: white !important;
    border-bottom: 2px solid #3b82f6;
    background: rgba(59, 130, 246, 0.2) !important;
    backdrop-filter: blur(10px);
}

.tab-button {
    transition: all 0.3s ease;
    position: relative;
}

.tab-button::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #3b82f6;
    transition: width 0.3s ease;
}

.tab-button.active::after {
    width: 100%;
}

/* Loading spinner */
.spinner {
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top: 3px solid #3b82f6;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Modal backdrop */
.modal-backdrop {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: rgba(0, 0, 0, 0.6);
}

/* Premium Navbar with Glass Effect */
nav.glass-nav {
    background: rgba(15, 23, 42, 0.7) !important;
    backdrop-filter: blur(25px) saturate(180%);
    -webkit-backdrop-filter: blur(25px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        0 4px 30px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.15),
        0 0 40px rgba(59, 130, 246, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* Footer Glass Effect */
footer {
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(15px) saturate(180%);
    -webkit-backdrop-filter: blur(15px) saturate(180%);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.3);
    z-index: 0;
}

footer .glass-card {
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        0 8px 32px 0 rgba(31, 38, 135, 0.37),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Card Hover Effects */
.card-hover {
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.card-hover:hover {
    transform: translateY(-8px) scale(1.02);
}

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 50%, #f472b6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
}

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

/* Pulse animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Shimmer Effect */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.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: 1000px 100%;
    animation: shimmer 2s infinite;
}

/* Mobile Sidebar Animation */
#mobileMenu {
    box-shadow: 4px 0 30px rgba(0, 0, 0, 0.5);
}

#mobileOverlay {
    transition: opacity 0.3s ease;
}

/* Currency Symbol Styling */
.currency-symbol {
    font-size: 1.5em;
    font-weight: 900;
    line-height: 1;
}

/* Responsive */
@media (max-width: 640px) {
    .text-6xl {
        font-size: 2.5rem;
    }
    
    .text-4xl {
        font-size: 2rem;
    }
    
    .glass-card {
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
    }
    
    #mobileMenu {
        width: 280px;
    }
}

/* Notification Styles */
.notification {
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}