.app-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) var(--feed-width) 1fr;
    height: 100vh;
    width: 100vw;
}

/* 1. Sidebar */
.sidebar {
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    padding: var(--space-4) var(--space-2);
    overflow-y: auto; /* Enable scrolling */
    height: 100vh; /* Constrain height */
}

.sidebar-section {
    margin-bottom: var(--space-6);
}

.sidebar-header {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 0 var(--space-3);
    margin-bottom: var(--space-2);
    letter-spacing: 0.05em;
}

/* Workflow Status Cards */
.workflow-status-card {
    margin: 0 var(--space-2);
    margin-bottom: var(--space-2);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.workflow-status-card:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-subtle);
}

.workflow-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    cursor: pointer;
}

.workflow-icon {
    font-size: 14px;
}

.workflow-name {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.workflow-status {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
}

.workflow-status.running {
    background: var(--color-warning);
    color: var(--bg-app);
    animation: pulse 1.5s infinite;
}

.workflow-status.success {
    background: var(--color-success);
    color: var(--bg-app);
}

.workflow-status.error {
    background: var(--color-error);
    color: white;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.workflow-meta {
    font-size: 10px;
    color: var(--text-muted);
    padding: 0 var(--space-3) var(--space-2);
    /* Reserve space to avoid hover-driven layout shift (premium polish). */
    display: block;
    min-height: 14px; /* ~1 line at 10px font size */
    opacity: 0;
    transition: opacity 0.15s ease;
}

.workflow-status-card:hover .workflow-meta:not(:empty) {
    opacity: 1;
}

/* 2. Feed */
.feed {
    background-color: var(--bg-app);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    overflow: hidden; /* Inner scroll */
}

.feed-header {
    height: var(--header-height);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
    background-color: rgba(15, 17, 21, 0.95); /* Backdrop blur simulation */
    backdrop-filter: blur(8px);
    z-index: 10;
}

.feed-list {
    flex: 1;
    overflow-y: auto;
    scroll-behavior: smooth;
}

/* 3. Stage */
.stage {
    background-color: var(--bg-panel);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.stage-header {
    height: 60px; /* Slightly taller */
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    padding: 0 var(--space-6);
    justify-content: space-between;
}

.stage-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-6);
    max-width: 900px; /* Readability constraint */
    margin: 0 auto;
    width: 100%;
}

.stage-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    font-size: 14px;
}