:root {
    --bg-color: #05070f;
    --bg-gradient: linear-gradient(135deg, #05070f 0%, #0c0f20 100%);
    --card-bg: rgba(13, 18, 35, 0.7);
    --border-color: rgba(139, 92, 246, 0.2);
    --border-hover: rgba(139, 92, 246, 0.4);
    
    --accent-color: #8b5cf6;
    --accent-gradient: linear-gradient(90deg, #8b5cf6 0%, #ec4899 100%);
    --accent-glow: rgba(139, 92, 246, 0.4);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    --sidebar-width: 260px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

body {
    background-color: var(--bg-color);
    background-image: var(--bg-gradient);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    height: 100vh;
    overflow: hidden;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
}
::-webkit-scrollbar-thumb {
    background: rgba(139, 92, 246, 0.3);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(139, 92, 246, 0.6);
}

/* Glassmorphism Common */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
}

/* 1. AUTH LAYOUT */
#auth-section {
    display: none;
    height: 100vh;
    align-items: center;
    justify-content: center;
}
#auth-section.active {
    display: flex;
}
.auth-card {
    width: 420px;
    padding: 40px;
}
.auth-header {
    text-align: center;
    margin-bottom: 30px;
}
.logo-glow {
    width: 60px;
    height: 60px;
    background: var(--accent-gradient);
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 15px;
    box-shadow: 0 0 20px var(--accent-glow);
}
.logo-glow-small {
    width: 36px;
    height: 36px;
    background: var(--accent-gradient);
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: 'Outfit', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 0 12px var(--accent-glow);
}
.auth-header h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    margin-bottom: 8px;
}
.auth-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Forms styling */
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}
.input-wrapper {
    position: relative;
}
.input-wrapper i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    width: 18px;
    height: 18px;
}
input[type="text"],
input[type="password"],
input[type="file"],
select {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
}
.input-wrapper input {
    padding-left: 44px;
}
input:focus, select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px rgba(139, 92, 246, 0.3);
}

.form-row {
    display: flex;
    gap: 15px;
}
.form-group.half {
    width: 50%;
}
.form-group.third {
    width: 33.33%;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    box-shadow: 0 4px 14px var(--accent-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}
.btn-primary:active {
    transform: translateY(0);
}

.error-msg {
    color: var(--error-color);
    font-size: 0.85rem;
    margin-top: 15px;
    text-align: center;
}

/* 2. MAIN APP SECTION */
#app-section {
    display: none;
    height: 100vh;
}
#app-section.active {
    display: flex;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: rgba(8, 12, 27, 0.85);
    backdrop-filter: blur(12px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 30px 20px;
}
.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 40px;
}
.sidebar-header h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
}
.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}
.nav-item {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
}
.nav-item:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}
.nav-item.active {
    background: rgba(139, 92, 246, 0.15);
    color: var(--text-primary);
    border-left: 3px solid var(--accent-color);
}
.admin-only {
    display: none;
}
.sidebar-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 20px;
}
.user-info {
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}
.user-info span:first-child {
    font-weight: 600;
}
.badge {
    align-self: flex-start;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
    background: rgba(139, 92, 246, 0.2);
    color: #a78bfa;
    border: 1px solid rgba(139, 92, 246, 0.3);
    text-transform: uppercase;
    margin-top: 4px;
}
.badge-visibility {
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
}
.badge-visibility.public {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}
.badge-visibility.private {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}
.badge-strategy {
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    background: rgba(59, 130, 246, 0.2);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.3);
    text-transform: capitalize;
}
.btn-logout {
    background: transparent;
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
    border-radius: 8px;
    padding: 10px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
}
.btn-logout:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* Main Content Area */
.main-content {
    flex-grow: 1;
    height: 100vh;
    position: relative;
    overflow: hidden;
}
.app-view {
    display: none;
    height: 100%;
    flex-direction: column;
    padding: 40px;
}
.app-view.active {
    display: flex;
}
.view-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 20px;
    margin-bottom: 25px;
}
.header-title h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.6rem;
    margin-bottom: 6px;
}
.header-title p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.rag-controls {
    display: flex;
    gap: 15px;
}
.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.control-group label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}
.control-group select {
    padding: 8px 12px;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.04);
}

/* 3. CHAT INTERFACE */
.chat-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background: rgba(8, 12, 27, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}
.chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.message {
    display: flex;
    gap: 15px;
    max-width: 85%;
    animation: fadeInUp 0.3s ease;
}
.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}
.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}
.message.user .message-avatar {
    background: var(--accent-gradient);
    border: none;
    box-shadow: 0 0 10px var(--accent-glow);
}
.message-content {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 12px 18px;
    font-size: 0.95rem;
    line-height: 1.5;
}
.message.user .message-content {
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.2);
}

/* Citations Cards inside chat messages */
.citations-area {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.citations-title {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 5px;
}
.citations-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.citation-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 6px;
    padding: 6px 12px;
    font-size: 0.8rem;
    color: #a78bfa;
    cursor: pointer;
    max-width: 250px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.citation-card:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-color);
}
.citation-details {
    display: none;
    margin-top: 8px;
    padding: 8px;
    background: rgba(0, 0, 0, 0.2);
    border-left: 3px solid var(--accent-color);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: pre-wrap;
    max-height: 150px;
    overflow-y: auto;
}

/* Chat Input */
.chat-input-area {
    padding: 20px;
    background: rgba(5, 7, 15, 0.6);
    border-top: 1px solid var(--border-color);
}
.chat-input-area form {
    display: flex;
    gap: 12px;
}
.chat-input-area input {
    flex-grow: 1;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 18px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
}
.btn-send {
    background: var(--accent-gradient);
    border: none;
    color: #fff;
    width: 46px;
    height: 46px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 10px var(--accent-glow);
}
.btn-send:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 14px var(--accent-glow);
}

/* 4. ADMIN DASHBOARD */
.admin-grid {
    flex-grow: 1;
    display: flex;
    gap: 30px;
    overflow: hidden;
}
.admin-col {
    width: 50%;
    display: flex;
    flex-direction: column;
    gap: 30px;
    overflow-y: auto;
    padding-right: 5px;
}
.admin-card {
    padding: 25px;
}
.admin-card h3 {
    font-size: 1.15rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #a78bfa;
}
.desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 15px;
}
.status-msg {
    font-size: 0.85rem;
    margin-top: 12px;
}
.status-success {
    color: var(--success-color);
}
.status-error {
    color: var(--error-color);
}

/* Tables */
.table-container {
    max-height: 250px;
    overflow-y: auto;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}
.margin-top {
    margin-top: 20px;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    padding: 10px 12px;
    text-align: left;
    font-size: 0.85rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
th {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
    font-weight: 600;
}
tr:hover td {
    background: rgba(255, 255, 255, 0.01);
}

/* Knowledge Map Canvas */
.height-full {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    min-height: 600px;
}
.card-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
}
.btn-icon:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}
.canvas-container {
    flex-grow: 1;
    position: relative;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.3);
}
#knowledge-map-canvas {
    width: 100%;
    height: 100%;
    display: block;
}
.map-preview-card {
    position: absolute;
    bottom: 15px;
    left: 15px;
    right: 15px;
    background: rgba(10, 14, 27, 0.9);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 8px;
    padding: 12px 16px;
    backdrop-filter: blur(10px);
}
.map-preview-card h4 {
    font-size: 0.85rem;
    color: #a78bfa;
    margin-bottom: 6px;
}
#map-preview-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    max-height: 80px;
    overflow-y: auto;
}
.map-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 8px 2px 2px;
    border-top: 1px solid rgba(255,255,255,0.06);
    margin-top: 6px;
}
.legend-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.72rem;
    color: var(--text-secondary);
}
.legend-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    flex-shrink: 0;
    display: inline-block;
}

/* Keyframes */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Language Selector Styles */
.lang-selector {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    padding: 4px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}
.btn-lang {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    text-align: center;
    transition: all 0.2s ease;
}
.btn-lang:hover {
    color: var(--text-primary);
}
.btn-lang.active {
    background: rgba(139, 92, 246, 0.2);
    color: var(--text-primary);
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.lang-selector-auth {
    position: absolute;
    top: 15px;
    right: 20px;
    display: flex;
    gap: 5px;
    font-size: 0.8rem;
    color: var(--text-muted);
}
.btn-lang-toggle-auth {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}
.btn-lang-toggle-auth:hover {
    color: var(--text-primary);
}
.btn-lang-toggle-auth.active {
    color: var(--accent-color);
}

/* Dropdown styling */
select option {
    background-color: #0c0f20;
    color: var(--text-primary);
}

/* --- CHAT HISTORY SIDEBAR STYLES --- */
.chat-view-layout {
    display: flex;
    flex-grow: 1;
    gap: 20px;
    height: calc(100% - 90px);
    overflow: hidden;
    margin-top: 10px;
}

.chat-history-sidebar {
    width: 250px;
    display: flex;
    flex-direction: column;
    padding: 18px 12px;
    background: rgba(8, 12, 27, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    flex-shrink: 0;
}

.btn-new-chat {
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 15px;
    box-shadow: 0 4px 10px var(--accent-glow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-new-chat:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px var(--accent-glow);
}

.session-list {
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-right: 4px;
}

.session-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.03);
    cursor: pointer;
    transition: all 0.2s ease;
    gap: 10px;
}

.session-item:hover {
    background: rgba(139, 92, 246, 0.05);
    border-color: rgba(139, 92, 246, 0.2);
}

.session-item.active {
    background: rgba(139, 92, 246, 0.15);
    border-color: var(--accent-color);
}

.session-item-title-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow: hidden;
    flex-grow: 1;
}

.session-item-title-wrapper i {
    width: 15px;
    height: 15px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.session-item.active .session-item-title-wrapper i {
    color: var(--accent-color);
}

.session-title {
    font-size: 0.82rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: left;
}

.btn-delete-session {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.btn-delete-session:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}