/**
 * 56K Knowledge Hub - Layout Structure
 * Sidebar + Main Content Layout
 */

/* ============= APP LAYOUT ============= */

.app {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* ============= SIDEBAR ============= */

.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform var(--transition-normal), width var(--transition-normal);
    z-index: 50;
}

.sidebar-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2);
}

.sidebar-footer {
    padding: var(--space-3);
    border-top: 1px solid var(--color-border);
}

/* New Chat Button */
.btn-new-chat {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-new-chat:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border-hover);
}

.btn-new-chat svg {
    width: 16px;
    height: 16px;
}

/* Conversation Groups */
.conversation-group {
    margin-bottom: var(--space-4);
}

.conversation-group-title {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Conversation Item */
.conversation-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    position: relative;
}

.conversation-item:hover {
    background: var(--color-bg-hover);
}

.conversation-item.active {
    background: var(--color-bg-active);
}

.conversation-item-icon {
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.conversation-item-content {
    flex: 1;
    min-width: 0;
}

.conversation-item-title {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.conversation-item-actions {
    display: none;
    gap: var(--space-1);
}

.conversation-item:hover .conversation-item-actions {
    display: flex;
}

.conversation-item-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.conversation-item-btn:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

/* User Profile in Sidebar */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-profile:hover {
    background: var(--color-bg-hover);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-inverse);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
    overflow: hidden;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-info {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-status {
    font-size: var(--font-size-xs);
    color: var(--color-success);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.user-status::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-success);
    border-radius: var(--radius-full);
}

/* ============= MAIN CONTENT ============= */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100vh;
    background: var(--color-bg-primary);
}

/* Header */
.main-header {
    height: var(--header-height);
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-primary);
    flex-shrink: 0;
}

.main-header-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.main-header-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-accent) 0%, #0d9488 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

/* Service Status Pills */
.service-pills {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.service-pill {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.service-pill-dot {
    width: 6px;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--color-text-muted);
}

.service-pill-dot.online {
    background: var(--color-success);
}

.service-pill-dot.offline {
    background: var(--color-error);
}

.service-pill-dot.checking {
    background: var(--color-warning);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* Header Icon Buttons */
.icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.icon-btn svg {
    width: 20px;
    height: 20px;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
}

/* ============= CHAT AREA ============= */

.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.messages-scroll {
    max-width: var(--max-chat-width);
    margin: 0 auto;
    width: 100%;
}

/* ============= MOBILE RESPONSIVE ============= */

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: flex;
    }

    /* Overlay when sidebar is open */
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 40;
    }

    .sidebar-overlay.visible {
        display: block;
    }

    .main-header {
        padding: 0 var(--space-3);
    }

    .service-pills {
        display: none;
    }
}

@media (max-width: 480px) {
    .logo-text {
        display: none;
    }
}