/* =============================================
   Selection Group System — 框选分组样式
   ============================================= */

/* ===== Group Container ===== */
.selection-group {
    position: absolute;
    pointer-events: none;
    z-index: 5;
    transition: none;
}

/* ===== Border Frame ===== */
.selection-group-frame {
    position: absolute;
    inset: 44px 0 0 0;
    border: 1.5px solid rgba(255,196,120, 0.25);
    border-radius: 16px;
    background: rgba(255,168,79, 0.03);
    pointer-events: none;
    transition: border-color 0.2s ease, background 0.2s ease;
}

/* Hover effect on frame */
.selection-group:hover .selection-group-frame {
    border-color: rgba(255,196,120, 0.4);
    background: rgba(255,168,79, 0.05);
}

/* Dashed corners for visual flair */
.selection-group-frame::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 16px;
    border: 1px dashed rgba(255,196,120, 0.08);
    pointer-events: none;
}

/* ===== Toolbar ===== */
.selection-group-toolbar {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 2px;
    height: 40px;
    padding: 0 6px;
    background: rgba(40, 44, 52, 0.84);
    border: 1px solid rgba(69, 72, 78, 0.28);
    border-radius: 12px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.45),
        0 0 0 1px rgba(255, 255, 255, 0.04) inset;
    pointer-events: auto;
    z-index: 10;
    white-space: nowrap;
    animation: sgToolbarIn 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes sgToolbarIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-6px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}

/* Toolbar buttons */
.sg-tool-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.65);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
    pointer-events: auto;
    font-family: inherit;
}

.sg-tool-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.95);
}

.sg-tool-btn:active {
    background: rgba(255, 255, 255, 0.12);
    transform: scale(0.96);
}

.sg-tool-btn svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    opacity: 0.75;
}

.sg-tool-btn:hover svg {
    opacity: 1;
}

/* Divider between buttons */
.sg-tool-btn + .sg-tool-btn::before {
    content: '';
    display: block;
    width: 1px;
    height: 16px;
    background: rgba(255, 255, 255, 0.06);
    margin-right: 2px;
    flex-shrink: 0;
}

/* ===== Output Port (right side) ===== */
.selection-group-port {
    position: absolute;
    right: var(--port-base-right, -50px);
    top: calc(50% + 22px);
    --port-follow-x: 0px;
    --port-follow-y: 0px;
    transform: translateX(50%) translateY(-50%) translate(var(--port-follow-x), var(--port-follow-y));
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.10);
    border: 1.5px solid rgba(255, 255, 255, 0.30);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: crosshair;
    pointer-events: auto;
    z-index: 15;
    transition: all 0.2s cubic-bezier(0.22, 1, 0.36, 1);
    animation: sgPortIn 0.3s cubic-bezier(0.22, 1, 0.36, 1) 0.1s both;
}

@keyframes sgPortIn {
    from {
        opacity: 0;
        transform: translateX(50%) translateY(-50%) translate(var(--port-follow-x), var(--port-follow-y)) scale(0.6);
    }
    to {
        opacity: 1;
        transform: translateX(50%) translateY(-50%) translate(var(--port-follow-x), var(--port-follow-y)) scale(1);
    }
}

.selection-group-port:hover {
    background: rgba(255,168,79, 0.15);
    border-color: rgba(255,179,71, 0.8);
    box-shadow: 0 0 0 4px rgba(255,168,79, 0.12);
    transform: translateX(50%) translateY(-50%) translate(var(--port-follow-x), var(--port-follow-y)) scale(1.08);
}

.selection-group-port:active {
    transform: translateX(50%) translateY(-50%) translate(var(--port-follow-x), var(--port-follow-y)) scale(0.95);
    background: rgba(255,168,79, 0.25);
}

.sg-port-plus {
    font-size: 22px;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1;
    pointer-events: none;
    transition: color 0.15s ease;
}

.selection-group-port:hover .sg-port-plus {
    color: rgba(255, 255, 255, 0.95);
}

/* ===== Node Count Badge ===== */
.selection-group-badge {
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    padding: 3px 12px;
    background: rgba(18, 23, 34, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: 10px;
    font-size: 11px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.55);
    white-space: nowrap;
    pointer-events: none;
    backdrop-filter: blur(8px);
    animation: sgBadgeIn 0.25s ease 0.15s both;
}

@keyframes sgBadgeIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* ===== Toast Notification ===== */
.sg-toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    padding: 10px 20px;
    background: rgba(18, 23, 34, 0.96);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: 10px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 13px;
    font-weight: 500;
    z-index: 10000;
    pointer-events: none;
    opacity: 0;
    backdrop-filter: blur(16px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
    transition: opacity 0.2s ease, transform 0.2s ease;
    white-space: nowrap;
}

.sg-toast.sg-toast-in {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.sg-toast.sg-toast-out {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
}

/* ===== Connecting state — highlight the group port ===== */
body.is-connecting .selection-group-port {
    border-color: rgba(255,179,71, 0.6);
    box-shadow: 0 0 0 6px rgba(255,168,79, 0.1);
}

/* ===== Drag line from group port ===== */
.connection-path.active {
    stroke: rgba(255,179,71, 0.8);
    stroke-width: 2.5;
    stroke-dasharray: 8 4;
    animation: sgDashFlow 0.8s linear infinite;
}

@keyframes sgDashFlow {
    to {
        stroke-dashoffset: -12;
    }
}

/* ===== Drop Menu ===== */
.sg-drop-menu {
    z-index: 1000;
}

/* ===== Responsive: smaller screens ===== */
@media (max-width: 768px) {
    .selection-group-toolbar {
        padding: 0 4px;
    }

    .sg-tool-btn {
        padding: 0 8px;
        font-size: 11px;
    }

    .sg-tool-btn span {
        display: none;
    }
}