#viewer {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, #f4f7fb 0%, #edf2f8 100%);
    display: flex;
    padding: 12px;
    padding-top: 44px;
    gap: 10px;
    color: #111827;
    font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 13px;
}

#viewer * {
    all: revert;
}

#viewer .viewHeader {
    max-height: 34px;
    flex-basis: 34px;
    flex-shrink: 0;
    line-height: 1.2rem;
    padding: 8px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid #e5e7eb;
    background: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);
    font-weight: 600;
    color: #334155;
}

#viewer #close_btn {
    position: absolute;
    top: 12px;
    left: 14px;
    z-index: 5;
    padding: 2px 10px;
    min-height: 26px;
    border-radius: 999px;
    cursor: pointer;
    color: #334155;
    background: #ffffff;
    border: 1px solid #b8c6d9;
    font-size: 12px;
    line-height: 1.2;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.08);
}

#viewer #close_btn:hover {
    background: #f8fafc;
    border-color: #94a3b8;
}

#viewer #db_list {
    width: 300px;
    min-width: 180px;
    max-width: 750px;
    flex: 0 0 auto;
    padding: 0;
    background-color: darkgray;
    display: flex;
    flex-direction: column;
    border: 1px solid #dbe2ea;
    border-radius: 10px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.08);
}

#viewer #tree_root {
    flex-grow: 1;
    padding: 0;
    background-color: #fff;
}

#viewer #middle_panel {
    background: #fff;
    flex: 1;
    flex-basis: 800px;
    display: flex;
    flex-direction: column;
    border: 1px solid #dbe2ea;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.08);
}

#viewer #right_panel {
    width: 300px;
    min-width: 180px;
    max-width: 500px;
    flex: 0 0 auto;
    padding: 0;
    background: transparent;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#viewer #right_panel > div {
    height: 33.33%;
    border: 1px solid #dbe2ea;
    border-radius: 10px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.08);
}

#viewer .resizeDragHandler {
    width: 10px;
    flex-shrink: 0;
    cursor: col-resize;
    position: relative;
}

#viewer .resizeDragHandler:hover::after {
    border: 2px solid #94a3b8;
    border-radius: 999px;
    content: '';
    display: block;
    height: 72%;
    margin: 0 auto;
    position: relative;
    top: 14%;
    width: 0;
}

#viewer button,
#viewer input,
#viewer textarea {
    font: inherit;
}

#viewer button {
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    color: #1e293b;
    padding: 4px 10px;
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

#viewer button.panelActionBtn {
    border-top-left-radius: 0;
    border-top-right-radius: 0;
    border-bottom-left-radius: 9px;
    border-bottom-right-radius: 9px;
}

#viewer button:hover:not([disabled]) {
    border-color: #94a3b8;
    background: #f8fafc;
}

#viewer button[disabled] {
    opacity: 0.55;
    cursor: not-allowed;
}

#viewer input,
#viewer textarea {
    border: 1px solid #cbd5e1;
    background: #fff;
    color: #111827;
    padding: 6px 8px;
}

#viewer input:focus,
#viewer textarea:focus {
    outline: none;
    border-color: #60a5fa;
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.18);
}