/* ==========================================================================
 *   App Container - Modern Layout
 *  ========================================================================== */
.app-wrapper {
    display: flex;
    height: 100%;
    width: 100%;
}

/* ==========================================================================
 *  Chat Container - Enhanced Design
 *  ========================================================================== */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    background: var(--bg-primary);
    min-height: 0;
}

.chat-container.drag-over {
    background: linear-gradient(var(--bg-primary), var(--bg-primary)) padding-box,
    linear-gradient(90deg, var(--accent) 50%, transparent 50%) border-box;
    border: 2px dashed var(--accent);
}

/* ==========================================================================
 *  Main Content Area - Modern Design
 *  ========================================================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    min-width: 0;
    min-height: 0;
    background: var(--bg-primary);
}

.app-container {
    display: flex;
    flex-direction: column;
    width: var(--chat-content-width, 100%);
    height: 100%;
    margin: 0 auto;
    background: var(--bg-secondary);
    box-shadow: var(--shadow-medium);
    min-height: 0;
}

/* Drop Overlay - Modern Design */
.drop-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    pointer-events: none;
}

.drop-overlay.active {
    display: flex;
}

.drop-overlay-content {
    background: var(--bg-tertiary);
    border: 2px dashed var(--accent);
    border-radius: var(--radius-xl);
    padding: 48px 72px;
    text-align: center;
    box-shadow: var(--shadow-strong);
}

.drop-overlay-content svg {
    width: 56px;
    height: 56px;
    margin-bottom: 16px;
    color: var(--accent);
}