body {
    font-family: sans-serif; background: #f5f5f5;
}

#app {
    display: flex; gap: 20px; padding: 20px;
}

.left-panel {
    width: 500px; background: #fff; padding: 15px;
    border-radius: 8px; box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    font-weight: bold; display: block; margin-bottom: 5px;
}

.form-group input {
    width: 100%;
    padding: 6px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.right-panel {
    flex: 1;
    position: relative;
    background: #eee;
    border-radius: 8px;
    overflow: hidden;
    user-select: none;
}

.pdf-container {
    position: relative; display: inline-block;
}

.bbox {
    position: absolute;
    border: 2px solid #ff5252;
    /*background-color: rgba(255, 82, 82, 0.2);*/
    cursor: pointer;
}

.bbox.active {
    border-color: #199601 !important;
    background-color: rgba(25, 150, 1, 0.4) !important;
}

@keyframes focusPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

select {
    position: absolute;
    z-index: 10;
    background: #fff;
    border: 1px solid #ccc;
}

.select-box {
    position: absolute;
    /*border: 2px dashed #2196F3;*/
    background-color: rgba(33, 150, 243, 0.2);
    pointer-events: none;
    z-index: 5;
}

.delete-btn {
    position: absolute;
    top: 50%;
    right: -40px;
    transform: translateY(-50%);
    color: #ff4d4d;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    padding: 3px 6px;
    z-index: 20;
    background: white;
}


.edge {
    position: absolute;
    z-index: 25;

}

.edge.top, .edge.bottom {
    height: 8px;
    cursor: ns-resize;;
}
.edge.left, .edge.right {
    width: 8px;
    cursor: ew-resize;
}

.edge.top {
    top: -4px;
    left: 0;
    right: 0;
}

.edge.bottom {
    bottom: -4px;
    left: 0;
    right: 0;
}

.edge.left {
    top: 0;
    bottom: 0;
    left: -4px;
}

.edge.right  {
    top: 0;
    bottom: 0;
    right: -4px;
}

.corner {
    position: absolute;
    width: 14px;
    height: 14px;
    background: transparent;
    border: 2px solid transparent; /* mặc định trong suốt, chỉ tô 2 cạnh */
    z-index: 30;
    opacity: .95;
    transition: border-width .08s ease, transform .08s ease, opacity .08s ease;
    pointer-events: auto; /* bắt sự kiện kéo resize */
}


/* Mỗi góc hiện 2 cạnh + bo tròn đúng góc */
.corner.top-left {
    top: -8px; left: -8px;
    /*border-left-color: var(--corner-color);*/
    /*border-top-color: var(--corner-color);*/
    border-top-left-radius: 6px;
    cursor: nwse-resize;
}

.corner.top-right {
    top: -8px; right: -8px;
    /*border-right-color: var(--corner-color);*/
    /*border-top-color: var(--corner-color);*/
    border-top-right-radius: 6px;
    cursor: nesw-resize;
}

.corner.bottom-left {
    bottom: -8px; left: -8px;
    /*border-left-color: var(--corner-color);*/
    /*border-bottom-color: var(--corner-color);*/
    border-bottom-left-radius: 6px;
    cursor: nesw-resize;
}

.corner.bottom-right {
    bottom: -8px; right: -8px;
    /*border-right-color: var(--corner-color);*/
    /*border-bottom-color: var(--corner-color);*/
    border-bottom-right-radius: 6px;
    cursor: nwse-resize;
}

/* Hiệu ứng khi hover – dày hơn, rõ hơn */
.corner:hover {
    border-width: 3px;
    opacity: 1;
    transform: scale(1.02);
}