/* ====================================================================
   SLIET Antriksha Vigyan Society - Custom Design System & Glassmorphism
   ==================================================================== */

/* Base Academic Observatory & Starlight Theme */
body {
    background-color: #f4f4f6;
    background-image: 
        radial-gradient(at 10% 10%, rgba(217, 119, 6, 0.08) 0px, transparent 50%),
        radial-gradient(at 90% 90%, rgba(24, 24, 27, 0.05) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(245, 158, 11, 0.04) 0px, transparent 60%);
    background-attachment: fixed;
    color: #18181b;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Glassmorphism Observatory Cards */
.glass-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid rgba(229, 231, 235, 0.9);
    box-shadow: 0 10px 30px -5px rgba(24, 24, 27, 0.05), 0 4px 6px -2px rgba(24, 24, 27, 0.02);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.glass-card:hover {
    box-shadow: 0 20px 35px -10px rgba(217, 119, 6, 0.12), 0 10px 15px -3px rgba(24, 24, 27, 0.04);
    border-color: rgba(217, 119, 6, 0.45);
}
.glass-nav {
    background: rgba(244, 244, 246, 0.94);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 2px solid rgba(24, 24, 27, 0.18); /* Crisp dark charcoal border in Light Mode */
    box-shadow: 0 4px 20px -2px rgba(24, 24, 27, 0.05);
    transition: all 0.3s ease;
}
.gradient-text {
    color: #4f46e5;
    background: none;
    -webkit-text-fill-color: initial;
}
.gradient-badge {
    background: linear-gradient(135deg, rgba(217, 119, 6, 0.1) 0%, rgba(245, 158, 11, 0.15) 100%);
    border: 1px solid rgba(217, 119, 6, 0.25);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #4f46e5;
}

/* Display Typography & Special Font Effects */
.font-display {
    font-family: 'Outfit', 'Plus Jakarta Sans', sans-serif;
}
.font-space {
    font-family: 'Space Grotesk', sans-serif;
}

.hero-title-text {
    font-family: 'Outfit', sans-serif;
    letter-spacing: -0.025em;
}

/* Light / Dark Mode Header Text Shadow Effects */
.header-glow {
    text-shadow: 0 4px 20px rgba(79, 70, 229, 0.12);
}
html.dark .header-glow {
    text-shadow: 0 4px 30px rgba(56, 189, 248, 0.25);
}

/* Dark Mode Overrides */
html.dark body {
    background-color: #060814;
    background-image: 
        radial-gradient(at 15% 15%, rgba(79, 70, 229, 0.12) 0px, transparent 50%),
        radial-gradient(at 85% 85%, rgba(14, 165, 233, 0.1) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(124, 58, 237, 0.08) 0px, transparent 60%);
    background-attachment: fixed;
    color: #f1f5f9;
}
html.dark .glass-card {
    background: rgba(21, 27, 61, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}
html.dark .glass-nav {
    background: rgba(6, 8, 20, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}
html.dark .gradient-text {
    color: #38bdf8;
    background: none;
    -webkit-text-fill-color: initial;
}
html.dark .gradient-badge {
    background: rgba(21, 27, 61, 0.6);
    border: 1px solid rgba(56, 189, 248, 0.3);
}
html.dark ::-webkit-scrollbar-track {
    background: #060814;
}
html.dark ::-webkit-scrollbar-thumb {
    background: #1e293b;
}

/* ====================================================================
   Dynamic Scroll Reveal & Micro-Animations
   ==================================================================== */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1), transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}
.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger Delays for Grid Items */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }

/* Subtle Glow & Floating Keyframes */
@keyframes floatSlow {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-12px) rotate(1.5deg); }
}
.animate-float-slow {
    animation: floatSlow 6s ease-in-out infinite;
}

/* Pulse Ring Animation */
@keyframes pulseGlow {
    0%, 100% { opacity: 0.6; filter: drop-shadow(0 0 15px rgba(79, 70, 229, 0.25)); }
    50% { opacity: 1; filter: drop-shadow(0 0 25px rgba(2, 132, 199, 0.5)); }
}
.animate-pulse-glow {
    animation: pulseGlow 3s ease-in-out infinite;
}

/* Smooth Modal Entrance */
.modal-animate-enter {
    animation: modalScale 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes modalScale {
    from {
        opacity: 0;
        transform: scale(0.92) translateY(14px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}