/* Ideas Background - Books & Sparks Animation */
.ideas-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center bottom, #1e293b 0%, #0f172a 60%, #020617 100%);
    overflow: hidden;
    z-index: 0;
}

.books-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 30%;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 20px;
    padding: 0 40px 40px;
    box-sizing: border-box;
    opacity: 0.6;
    filter: blur(2px);
    animation: breatheBooks 8s infinite ease-in-out;
    will-change: opacity, filter;
}

@keyframes breatheBooks {
    0% {
        opacity: 0.5;
        filter: blur(3px);
    }
    50% {
        opacity: 0.7;
        filter: blur(1px);
    }
    100% {
        opacity: 0.5;
        filter: blur(3px);
    }
}

.book {
    position: relative;
    width: 60px;
    height: 80px;
    background: linear-gradient(135deg, #475569 0%, #334155 50%, #1e293b 100%);
    border-radius: 4px 4px 0 0;
    box-shadow: 
        inset -2px 0 4px rgba(0, 0, 0, 0.3),
        0 4px 8px rgba(0, 0, 0, 0.4),
        0 0 20px rgba(148, 163, 184, 0.2);
    transform-origin: bottom center;
    animation: bookGlow 6s infinite ease-in-out;
    will-change: transform, box-shadow;
}

.book::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, 
        transparent 0%, 
        rgba(148, 163, 184, 0.1) 50%, 
        transparent 100%);
    border-radius: 4px 4px 0 0;
}

.book::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 8px;
    right: 8px;
    height: 2px;
    background: rgba(148, 163, 184, 0.3);
    border-radius: 1px;
}

.book:nth-child(1) { animation-delay: 0s; }
.book:nth-child(2) { animation-delay: 0.5s; }
.book:nth-child(3) { animation-delay: 1s; }
.book:nth-child(4) { animation-delay: 1.5s; }
.book:nth-child(5) { animation-delay: 2s; }
.book:nth-child(6) { animation-delay: 2.5s; }
.book:nth-child(7) { animation-delay: 3s; }
.book:nth-child(8) { animation-delay: 3.5s; }

@keyframes bookGlow {
    0%, 100% {
        transform: translateY(0) scaleY(1);
        box-shadow: 
            inset -2px 0 4px rgba(0, 0, 0, 0.3),
            0 4px 8px rgba(0, 0, 0, 0.4),
            0 0 15px rgba(148, 163, 184, 0.15);
    }
    50% {
        transform: translateY(-3px) scaleY(1.02);
        box-shadow: 
            inset -2px 0 4px rgba(0, 0, 0, 0.3),
            0 6px 12px rgba(0, 0, 0, 0.5),
            0 0 25px rgba(148, 163, 184, 0.3);
    }
}

/* Book variations */
.book.tall {
    height: 100px;
    width: 55px;
}

.book.wide {
    width: 70px;
    height: 75px;
}

.book.thin {
    width: 45px;
    height: 90px;
}

/* Book colors */
.book.color-1 {
    background: linear-gradient(135deg, #64748b 0%, #475569 50%, #334155 100%);
}

.book.color-2 {
    background: linear-gradient(135deg, #475569 0%, #334155 50%, #1e293b 100%);
}

.book.color-3 {
    background: linear-gradient(135deg, #334155 0%, #1e293b 50%, #0f172a 100%);
}

.sparks-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.spark {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    pointer-events: none;
    opacity: 0;
    will-change: transform, opacity;
}

.spark::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: radial-gradient(circle, currentColor 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0.6;
}

.spark::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: radial-gradient(circle, currentColor 0%, transparent 80%);
    transform: translate(-50%, -50%);
    opacity: 0.3;
}

/* Spark colors - warm tones like embers */
.spark.color-1 {
    background: #fbbf24; /* Amber */
    color: #fbbf24;
    box-shadow: 0 0 8px rgba(251, 191, 36, 0.8), 0 0 16px rgba(251, 191, 36, 0.4);
}

.spark.color-2 {
    background: #fb923c; /* Orange */
    color: #fb923c;
    box-shadow: 0 0 8px rgba(251, 146, 60, 0.8), 0 0 16px rgba(251, 146, 60, 0.4);
}

.spark.color-3 {
    background: #f97316; /* Deep Orange */
    color: #f97316;
    box-shadow: 0 0 8px rgba(249, 115, 22, 0.8), 0 0 16px rgba(249, 115, 22, 0.4);
}

.spark.color-4 {
    background: #f59e0b; /* Yellow Orange */
    color: #f59e0b;
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.8), 0 0 16px rgba(245, 158, 11, 0.4);
}

.spark.color-5 {
    background: #eab308; /* Yellow */
    color: #eab308;
    box-shadow: 0 0 8px rgba(234, 179, 8, 0.8), 0 0 16px rgba(234, 179, 8, 0.4);
}

/* Spark trail effect */
.spark.trail {
    width: 2px;
    height: 20px;
    border-radius: 2px;
    background: linear-gradient(to top, currentColor 0%, transparent 100%);
    opacity: 0.4;
}

/* Subtle vignette effect */
.ideas-background::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        ellipse at center, 
        transparent 0%, 
        transparent 50%,
        rgba(0, 0, 0, 0.2) 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* Optional: Add a subtle scanline effect */
.ideas-background::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent 0px,
        transparent 2px,
        rgba(0, 0, 0, 0.02) 2px,
        rgba(0, 0, 0, 0.02) 3px
    );
    pointer-events: none;
    z-index: 2;
    opacity: 0.3;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .book {
        width: 45px;
        height: 60px;
    }
    
    .book.tall {
        height: 75px;
        width: 40px;
    }
    
    .book.wide {
        width: 55px;
        height: 55px;
    }
    
    .book.thin {
        width: 35px;
        height: 70px;
    }
    
    .books-container {
        gap: 12px;
        padding: 0 20px 20px;
    }
}

@media (max-width: 480px) {
    .book {
        width: 35px;
        height: 50px;
    }
    
    .books-container {
        gap: 8px;
        padding: 0 15px 15px;
    }
}