/**
 * Sudoku Game - Modern Tailwind CSS Styles
 * Custom CSS for enhanced animations and effects
 * Main styling is handled by Tailwind CSS in HTML
 */

/* Custom animations and transitions */
.animated-bg {
    background: linear-gradient(-45deg, #0f0f23, #1a1a2e, #16213e, #0f3460, #533a7d, #4a0e4e);
    background-size: 400% 400%;
    animation: gradient 10s ease infinite;
    position: relative;
}

.animated-bg::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(120, 219, 255, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 0% 100%, rgba(255, 0, 150, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 100% 0%, rgba(0, 255, 255, 0.2) 0%, transparent 50%);
    animation: glow 8s ease-in-out infinite alternate;
}

@keyframes glow {
    0% {
        opacity: 0.5;
    }
    100% {
        opacity: 0.8;
    }
}

.glass-effect {
    background: rgba(15, 15, 35, 0.4);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(120, 119, 198, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.glass-effect:hover {
    border-color: rgba(255, 119, 198, 0.5);
    box-shadow: 0 8px 32px rgba(255, 119, 198, 0.2);
    transition: all 0.3s ease;
}

.sudoku-cell {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sudoku-cell:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.sudoku-cell.selected {
    background: linear-gradient(135deg, #ff0080, #ff0040);
    color: white;
    transform: scale(1.1);
    box-shadow: 0 0 30px rgba(255, 0, 128, 0.8), 0 0 60px rgba(255, 0, 128, 0.4);
}

.sudoku-cell.given {
    background: linear-gradient(135deg, #7c3aed, #a855f7);
    color: white;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4);
}

.sudoku-cell.user-filled {
    background: linear-gradient(135deg, #00d9ff, #0099cc);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 217, 255, 0.4);
}

.sudoku-cell.error {
    background: linear-gradient(135deg, #ff1744, #ff5722);
    color: white;
    animation: shake 0.5s ease-in-out, errorGlow 2s ease-in-out;
    box-shadow: 0 0 20px rgba(255, 23, 68, 0.8);
}

@keyframes errorGlow {
    0%,
    100% {
        box-shadow: 0 0 20px rgba(255, 23, 68, 0.8);
    }
    50% {
        box-shadow: 0 0 40px rgba(255, 23, 68, 1);
    }
}

@keyframes shake {
    0%,
    100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    75% {
        transform: translateX(5px);
    }
}

.number-pad-btn {
    transition: all 0.2s ease;
}

.number-pad-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

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

.floating-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    background: linear-gradient(45deg, rgba(255, 0, 150, 0.6), rgba(0, 255, 255, 0.6));
    border-radius: 50%;
    animation: float 20s infinite linear;
    box-shadow: 0 0 10px rgba(255, 0, 150, 0.8);
}

.particle:nth-child(2n) {
    background: linear-gradient(45deg, rgba(120, 119, 198, 0.6), rgba(255, 119, 198, 0.6));
    box-shadow: 0 0 10px rgba(120, 119, 198, 0.8);
}

.particle:nth-child(3n) {
    background: linear-gradient(45deg, rgba(0, 255, 255, 0.6), rgba(255, 0, 150, 0.6));
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.8);
}

@keyframes float {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

/* Tooltip styles */
[title]:hover::after {
    content: attr(title);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    z-index: 1000;
    pointer-events: none;
}

[title] {
    position: relative;
}
/* Responsive design */
@media (max-width: 768px) {
    .sudoku-cell {
        width: 2.5rem !important;
        height: 2.5rem !important;
        font-size: 1rem !important;
    }

    .number-pad-btn {
        width: 2.5rem !important;
        height: 2.5rem !important;
        font-size: 1rem !important;
    }
}

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

/* Custom focus styles for accessibility */
*:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}