/* ─── KAI // LYRIC-SYNC: LAYOUT ─── */
.app-header {
    flex-shrink: 0;
    padding: 10px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(4, 11, 19, 0.85);
    border-bottom: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    z-index: 100;
}

.brand-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.25), rgba(255, 77, 109, 0.2));
    border: 1px solid var(--border-bright);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--cyan);
    box-shadow: var(--cyan-glow);
}

.brand-titles {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--text-pure);
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-title span.accent {
    color: var(--cyan);
    text-shadow: var(--cyan-glow);
}

.brand-subtitle {
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

.telemetry-bar {
    display: flex;
    align-items: center;
    gap: 8px;
}

.telemetry-pill {
    font-size: 0.72rem;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    background: rgba(10, 25, 40, 0.7);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.telemetry-pill.online {
    border-color: rgba(16, 185, 129, 0.4);
    color: var(--emerald);
}

.telemetry-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 8px currentColor;
    animation: cyber-pulse 2s infinite ease-in-out;
}

/* Nav Tabs */
.tabs-bar {
    flex-shrink: 0;
    padding: 8px 18px 0;
    display: flex;
    gap: 6px;
    background: rgba(4, 11, 19, 0.6);
    border-bottom: 1px solid var(--border-subtle);
}

.tab-btn {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    padding: 8px 16px;
    border: 1px solid transparent;
    border-bottom: none;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.18s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
    color: var(--cyan);
    background: var(--bg-surface);
    border-color: var(--border-bright);
    box-shadow: 0 -4px 12px rgba(0, 240, 255, 0.12);
}

.tab-btn .badge-pill {
    font-size: 0.62rem;
    padding: 1px 6px;
    border-radius: var(--radius-pill);
    background: var(--cyan-dim);
    color: var(--cyan);
}

/* Main App Shell */
.app-shell {
    flex: 1;
    min-height: 0;
    display: grid;
    grid-template-columns: minmax(460px, 560px) 1fr;
    gap: 12px;
    padding: 12px 18px 14px;
    overflow: hidden;
}

.control-deck {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
}

.deck-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stage-deck {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
    position: relative;
}

/* Responsive */
@media (max-width: 980px) {
    .app-shell {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
        overflow-y: auto;
    }
    body { overflow-y: auto; }
}