* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    background-color: #f8fafc;
    color: #1e293b;
}
/* Custom scrollbar styling for a premium feel */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Canvas workspace setup */
#canvas-wrapper {
    background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
    background-size: 15px 15px;
}

/* Drag-drop elements styling */
.placed-element {
    position: absolute;
    cursor: move;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.placed-element.selected {
    outline: 2px solid #4f46e5;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
}

/* Resizer handle anchor */
.resize-handle {
    position: absolute;
    width: 8px;
    height: 8px;
    background-color: #4f46e5;
    border: 1px solid #ffffff;
    bottom: -4px;
    right: -4px;
    cursor: se-resize;
    border-radius: 50%;
    z-index: 10;
}

/* Simulated TK styles mapping standard visual identity */
.tk-button {
    border: 1px solid #94a3b8;
    font-size: 12px;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.4), 0 1px 1px rgba(0,0,0,0.05);
    border-radius: 3px;
}
.tk-label {
    background: transparent;
    font-size: 12px;
}
.tk-entry {
    background: #ffffff;
    border: 1px solid #94a3b8;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
    border-radius: 2px;
    padding: 2px 5px;
    font-size: 12px;
}
.tk-checkbutton {
    display: flex;
    gap: 6px;
    align-items: center;
    font-size: 12px;
}
.tk-checkbutton::before {
    content: '';
    display: inline-block;
    width: 12px;
    height: 12px;
    border: 1px solid #475569;
    background: #ffffff;
    border-radius: 2px;
}
.tk-radiobutton {
    display: flex;
    gap: 6px;
    align-items: center;
    font-size: 12px;
}
.tk-radiobutton::before {
    content: '';
    display: inline-block;
    width: 12px;
    height: 12px;
    border: 1px solid #475569;
    background: #ffffff;
    border-radius: 50%;
}
.tk-text {
    background: #ffffff;
    border: 1px solid #94a3b8;
    border-radius: 2px;
    font-size: 11px;
}
.tk-listbox {
    background: #ffffff;
    border: 1px solid #94a3b8;
    font-size: 12px;
    border-radius: 2px;
}
.tk-scale {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 10px;
}
.tk-scale-track {
    width: 100%;
    height: 6px;
    background-color: #cbd5e1;
    border-radius: 3px;
    position: relative;
}
.tk-scale-handle {
    width: 10px;
    height: 14px;
    background: #64748b;
    border: 1px solid #475569;
    position: absolute;
    top: -4px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 1px;
}
.tk-progressbar {
    background: #e2e8f0;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    overflow: hidden;
}
.tk-progressbar-fill {
    width: 45%;
    height: 100%;
    background-color: #22c55e;
}
.tk-frame {
    border: 2px dashed #94a3b8;
    background-color: rgba(241, 245, 249, 0.4);
    border-radius: 4px;
}