body { 
    background: #0a0a0a; 
    color: #fff; 
    font-family: 'Plus Jakarta Sans', sans-serif;
    height: 100vh; 
    overflow: hidden; 
}

/* 1. HORIZONTAL SLIDE CANVAS TRACK */
.design-track {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 40px;
    padding: 40px;
    height: calc(100vh - 140px);
    scrollbar-width: thin;
}

.design-track::-webkit-scrollbar { height: 6px; }
.design-track::-webkit-scrollbar-thumb { background: #333; border-radius: 10px; }

.design-instance {
    min-width: 900px;
    max-width: 900px;
    scroll-snap-align: center;
    border-radius: 40px;
    padding: 40px;
    position: relative;
    transition: transform 0.3s ease;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
}

/* 2. BENTO MASONRY ENGINE */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 150px;
    gap: 15px;
}

.grid-large { grid-column: span 2; grid-row: span 2; }
.grid-wide { grid-column: span 2; }
.grid-tall { grid-row: span 2; }

.bento-card {
    border-radius: 24px;
    padding: 24px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* 3. SIDEBAR & TOOLS */
.glass-nav {
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
}

.version-badge {
    position: absolute;
    top: -15px; left: 40px;
    background: #fff; color: #000;
    padding: 4px 16px; border-radius: 20px;
    font-weight: 800; font-size: 0.7rem;
    text-transform: uppercase;
}

.border-dashed {
    border: 2px dashed rgba(255,255,255,0.1);
}