/* ACARS Sidebar Styles */
@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1); }
}

/* Main ACARS Sidebar (Collapsible) */
.main-acars-sidebar {
    display: flex;
    flex-direction: row;
    background: var(--bg-panel);
    border-left: 1px solid var(--border-color);
}
.main-acars-collapse-btn {
    width: 24px;
    min-width: 24px;
    background: rgba(0,0,0,0.4);
    border: none;
    border-right: 1px solid var(--border-color);
    color: var(--accent-cyan);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 6px 0;
    transition: background 0.2s;
}
.main-acars-collapse-btn:hover {
    background: rgba(74, 158, 255, 0.15);
}
.main-acars-collapse-label {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 8px;
    font-weight: 600;
    letter-spacing: 1px;
}
.main-acars-sidebar.collapsed .main-acars-collapse-label { display: block; }
.main-acars-sidebar:not(.collapsed) .main-acars-collapse-label { display: none; }
#mainAcarsCollapseIcon {
    font-size: 10px;
    transition: transform 0.3s;
}
.main-acars-sidebar.collapsed #mainAcarsCollapseIcon {
    transform: rotate(180deg);
}
.main-acars-content {
    width: 196px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: width 0.3s ease, opacity 0.2s ease;
}
.main-acars-sidebar.collapsed .main-acars-content {
    width: 0;
    opacity: 0;
    pointer-events: none;
}
.main-acars-messages {
    max-height: 350px;
}
.main-acars-msg {
    padding: 6px 8px;
    border-bottom: 1px solid var(--border-color);
    animation: fadeInMsg 0.3s ease;
}
.main-acars-msg:hover {
    background: rgba(74, 158, 255, 0.05);
}
@keyframes fadeInMsg {
    from { opacity: 0; transform: translateY(-3px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ACARS Status Indicator */
.acars-status-dot.listening {
    background: var(--accent-cyan) !important;
    animation: acars-pulse 1.5s ease-in-out infinite;
}
.acars-status-dot.receiving {
    background: var(--accent-green) !important;
}
.acars-status-dot.error {
    background: var(--accent-red) !important;
}
@keyframes acars-pulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(74, 158, 255, 0.7); }
    50% { opacity: 0.6; box-shadow: 0 0 6px 3px rgba(74, 158, 255, 0.3); }
}

/* ACARS Standalone Message Feed */
.acars-message-feed {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}
.acars-message-feed::-webkit-scrollbar {
    width: 4px;
}
.acars-message-feed::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}
.acars-feed-card {
    transition: background 0.15s;
}
.acars-feed-card:hover {
    background: rgba(74, 158, 255, 0.05);
}

/* Clickable ACARS sidebar messages (linked to tracked aircraft) */
.acars-message-item[style*="cursor: pointer"]:hover {
    background: rgba(74, 158, 255, 0.1);
}