/* Violetron Custom Design System - Enterprise Light Mode */

:root {
    /* Color Palette */
    --primary-purple: #7C3AED;
    --primary-purple-hover: #6D28D9;
    --dark-purple: #5B21B6;
    --light-purple: #F3E8FF;
    
    --bg-primary: #FAFAFC;
    --bg-secondary: #FFFFFF;
    
    --border-color: #E5E7EB;
    
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --text-white: #FFFFFF;
    
    /* Utility Colors */
    --success: #16A34A;
    --success-bg: #DCFCE7;
    --warning: #F59E0B;
    --warning-bg: #FEF3C7;
    --danger: #DC2626;
    --danger-bg: #FEE2E2;
    
    /* Typography & Spacing */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --transition-fast: all 180ms ease-in-out;
}

/* 1. RESET & BASE ELEMENTS */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* 2. THREE-COLUMN APP LAYOUT GRID */
.app-layout {
    display: grid;
    grid-template-columns: 280px 1fr 0px; /* Collapsed right panel by default */
    width: 100%;
    height: 100vh;
    background-color: var(--bg-primary);
    transition: grid-template-columns 200ms ease-in-out;
    position: relative;
}

.app-layout:has(.sidebar-right.open) {
    grid-template-columns: 280px 1fr 340px; /* Expanded state */
}

/* 3. LEFT SIDEBAR */
.sidebar {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px 16px;
    height: 100%;
    overflow-y: auto;
    gap: 16px;
}

.sidebar-menu-content {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 16px;
}


.sidebar-brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 4px 8px;
    width: 100%;
}

.brand-logo-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-logo {
    width: 32px;
    height: 32px;
    background-color: var(--primary-purple);
    color: var(--text-white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-logo svg {
    width: 18px;
    height: 18px;
}

.sidebar-brand h2 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.2px;
    color: var(--text-primary);
}

.mobile-menu-toggle-btn {
    display: none;
}

/* Sidebar action button */
.new-chat-btn {
    background-color: var(--primary-purple);
    color: var(--text-white);
    border: none;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-fast);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.new-chat-btn:hover {
    background-color: var(--primary-purple-hover);
}

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

/* Navigation items */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: var(--transition-fast);
}

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

.nav-item.active {
    background-color: var(--light-purple);
    color: var(--primary-purple);
    font-weight: 600;
}

.nav-item svg {
    width: 18px;
    height: 18px;
}

/* Sidebar status box */
.sidebar-status-box {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.status-header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.connection-status {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--danger);
    display: inline-block;
}

.connection-status.active {
    background-color: var(--success);
}

.status-text {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.sidebar-quick-stats {
    border-top: 1px solid var(--border-color);
    padding-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-secondary);
}

.stat-row strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* 4. CENTER PANELS & SWAPPABLE VIEWS */
.center-content {
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.view-panel {
    display: none;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.view-panel.active {
    display: flex;
}

.view-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 64px;
}

.view-header h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.view-header .subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.view-body {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.btn-icon-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.btn-icon-toggle svg {
    width: 16px;
    height: 16px;
}

/* Styling for separate layout of the toggle button next to input form */
.chat-input-row {
    display: flex;
    align-items: stretch;
    gap: 12px;
}

.chat-input-row .input-form {
    flex: 1;
}

.chat-input-row .btn-icon-toggle {
    border: 1px solid var(--border-color);
    width: 36px;
    height: auto;
    border-radius: 8px;
    background-color: var(--bg-secondary);
    flex-shrink: 0;
}

.chat-input-row .btn-icon-toggle:hover {
    background-color: var(--bg-primary);
}

/* 5. CHAT SYSTEM */
.messages-window {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    flex-direction: column;
    max-width: 80%;
    margin-bottom: 4px;
}

.message.user {
    align-self: flex-end;
}

.message.assistant {
    align-self: flex-start;
}

.message-bubble {
    padding: 10px 14px;
    font-size: 14px;
    line-height: 1.5;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

.message.user .message-bubble {
    background-color: var(--primary-purple);
    color: var(--text-white);
    border-radius: 8px;
}

.message.assistant .message-bubble {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

/* Message contents styling */
.message-content p {
    margin-bottom: 8px;
}
.message-content p:last-child {
    margin-bottom: 0;
}
.message-content strong {
    font-weight: 600;
}
.message-content code {
    font-family: Consolas, Monaco, monospace;
    font-size: 12px;
    background-color: rgba(0,0,0,0.05);
    padding: 2px 4px;
    border-radius: 4px;
}
.message-content li {
    margin-left: 20px;
    margin-bottom: 4px;
}

/* Reference Chips */
.source-badge {
    margin-top: 8px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: var(--light-purple);
    border: 1px solid rgba(124, 58, 237, 0.15);
    color: var(--primary-purple);
    font-size: 11px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition-fast);
    width: fit-content;
}

.source-badge:hover {
    background-color: #E6D5FF;
}

.source-badge svg {
    width: 12px;
    height: 12px;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
    opacity: 0.6;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

/* Chat Input Bar */
.chat-input-area {
    padding: 12px 24px;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.input-caution-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 8px;
    font-size: 11px;
    color: var(--text-secondary);
}

.input-caution-text svg {
    width: 12px;
    height: 12px;
    color: var(--warning);
}

.input-form {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 6px 10px;
    transition: var(--transition-fast);
}

.input-form:focus-within {
    border-color: var(--primary-purple);
    box-shadow: 0 0 0 2px rgba(124, 58, 237, 0.1);
}

.input-form textarea {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    resize: none;
    padding: 4px 0;
    max-height: 120px;
    min-height: 20px;
    line-height: 1.4;
}

.input-form textarea::placeholder {
    color: var(--text-secondary);
}

.send-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background-color: var(--primary-purple);
    color: var(--text-white);
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition-fast);
}

.send-btn:hover:not(:disabled) {
    background-color: var(--primary-purple-hover);
}

.send-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

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

/* 6. UPLOAD ZONE & DOCUMENTS TABLE */
.document-manager {
    max-width: 900px;
    width: 100%;
    align-self: center;
}

.upload-zone {
    border: 1.5px dashed var(--border-color);
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary-purple);
    background-color: var(--bg-primary);
}

.upload-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-purple);
}

.upload-icon svg {
    width: 100%;
    height: 100%;
}

.upload-text {
    font-size: 13px;
    color: var(--text-secondary);
}

.upload-text .highlight {
    color: var(--primary-purple);
    font-weight: 600;
}

.upload-limit {
    font-size: 11px;
    color: var(--text-muted);
}

/* Table Design */
.table-container {
    margin-top: 16px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.table-header-row {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-header-row h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.table-wrapper {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: left;
}

.data-table th {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 16px;
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.data-table tr:hover {
    background-color: var(--bg-primary);
}

.data-table tr:last-child td {
    border-bottom: none;
}

.font-medium {
    font-weight: 500;
}
.text-dark {
    color: var(--text-primary);
}
.text-center {
    text-align: center;
}

/* Table empty state */
.empty-table-row td {
    padding: 30px 16px;
}

.delete-file-action {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    padding: 4px;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
}

.delete-file-action:hover {
    color: var(--danger);
    background-color: var(--danger-bg);
}

/* 7. KNOWLEDGE BASE METRICS & CARDS */
.kb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 16px;
}

.kb-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

.kb-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
}

.kb-card-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-purple);
    background-color: var(--light-purple);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.kb-card-icon svg {
    width: 18px;
    height: 18px;
}

.kb-card-title-group {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
}

.kb-card-title-group h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.icon-menu-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.kb-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.kb-card-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
}

.kb-card-metrics .metric {
    display: flex;
    flex-direction: column;
    gap: 2px;
    text-align: center;
}

.kb-card-metrics .metric:not(:last-child) {
    border-right: 1px solid var(--border-color);
}

.kb-card-metrics .label {
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 500;
}

.kb-card-metrics .val {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.kb-card-footer {
    display: flex;
    justify-content: flex-end;
}

/* 8. SETTINGS MANAGER */
.settings-manager {
    max-width: 600px;
    width: 100%;
    align-self: center;
}

.settings-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

.settings-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.settings-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.settings-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
}

.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-wrapper input {
    width: 100%;
    padding: 10px 36px 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: var(--font-sans);
    font-size: 13px;
    outline: none;
    transition: var(--transition-fast);
}

.password-wrapper input:focus {
    border-color: var(--primary-purple);
    box-shadow: 0 0 0 2px rgba(124, 58, 237, 0.1);
}

.password-wrapper .icon-btn {
    position: absolute;
    right: 10px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.password-wrapper .icon-btn svg {
    width: 16px;
    height: 16px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-group input {
    width: 14px;
    height: 14px;
    accent-color: var(--primary-purple);
    cursor: pointer;
}

.checkbox-group label {
    font-size: 12px;
    color: var(--text-secondary);
    user-select: none;
    cursor: pointer;
}

.form-actions {
    display: flex;
    gap: 10px;
}

/* Buttons style */
.primary-btn {
    background-color: var(--primary-purple);
    color: var(--text-white);
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.primary-btn:hover {
    background-color: var(--primary-purple-hover);
}

.secondary-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.danger-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--danger);
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.danger-btn:hover {
    background-color: var(--danger-bg);
    border-color: rgba(220, 38, 38, 0.2);
}

.danger-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-primary);
    color: var(--text-muted);
    border-color: var(--border-color);
}

/* Status Messages */
.status-indicator {
    font-size: 12px;
    padding: 8px 12px;
    border-radius: 6px;
    line-height: 1.4;
    border: 1px solid transparent;
}

.status-indicator.info {
    background-color: rgba(124, 58, 237, 0.05);
    color: var(--primary-purple);
    border-color: rgba(124, 58, 237, 0.1);
}

.status-indicator.success {
    background-color: var(--success-bg);
    color: var(--success);
    border-color: rgba(22, 163, 74, 0.1);
}

.status-indicator.error {
    background-color: var(--danger-bg);
    color: var(--danger);
    border-color: rgba(220, 38, 38, 0.1);
}

/* 9. COLLAPSIBLE RIGHT SIDEBAR (RAG INSPECTOR) */
.sidebar-right {
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    position: absolute;
    top: 0;
    right: -340px; /* Hidden offscreen visually */
    width: 340px;
    z-index: 10;
    transition: right 200ms ease-in-out;
    box-shadow: -2px 0 8px rgba(0, 0, 0, 0.02);
}

.sidebar-right.open {
    position: relative;
    right: 0;
}

.sidebar-right-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 64px;
}

.sidebar-right-header h2 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-icon-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
}

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

.btn-icon-close svg {
    width: 16px;
    height: 16px;
}

.sidebar-right-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* RAG Source Cards */
.source-list-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: -4px;
}

.source-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.source-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.source-file {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 170px;
}

.source-score {
    font-size: 10px;
    font-weight: 600;
    background-color: var(--success-bg);
    color: var(--success);
    padding: 2px 6px;
    border-radius: 4px;
}

.source-chunk-info {
    font-size: 10px;
    color: var(--text-secondary);
}

.source-text {
    font-size: 12px;
    line-height: 1.4;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 8px;
    border-radius: 6px;
    white-space: pre-wrap;
}

/* Empty states */
.inspector-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
    padding: 24px;
    gap: 12px;
}

.inspector-empty svg {
    width: 32px;
    height: 32px;
    color: var(--text-muted);
}

.inspector-empty p {
    font-size: 12px;
    line-height: 1.4;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 40px 24px;
    text-align: center;
    gap: 12px;
    max-width: 480px;
    margin: 0 auto;
}

.empty-icon {
    width: 48px;
    height: 48px;
    color: var(--primary-purple);
    background-color: var(--light-purple);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
}

.empty-icon svg {
    width: 24px;
    height: 24px;
}

.empty-state h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Utilities */
.badge {
    font-size: 10px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
}
.badge.success {
    background-color: var(--success-bg);
    color: var(--success);
}

.hidden {
    display: none !important;
}

.text-success { color: var(--success); }
.text-xs { font-size: 11px !important; }
.danger-text { color: var(--danger) !important; }

/* 10. RESPONSIVE LAYOUT & MEDIA QUERIES */

/* Sidebar Overlay Backdrop */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    background-color: rgba(15, 12, 28, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 90;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Mobile Header (Hidden on Desktop) */
.mobile-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    padding: 0 16px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 30;
    flex-shrink: 0;
}

.mobile-brand-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.mobile-header-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: var(--transition-fast);
}

.mobile-header-btn:hover {
    background-color: var(--light-purple);
    color: var(--primary-purple);
}

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

/* Base modifications for touch targets and code wrap */
.message-content pre {
    background-color: rgba(0, 0, 0, 0.04);
    padding: 10px 14px;
    border-radius: 8px;
    margin: 8px 0;
    overflow-x: auto;
    max-width: 100%;
}
.message-content code {
    white-space: pre-wrap;
    word-break: break-word;
}
.nav-item {
    min-height: 44px;
}
.primary-btn, .secondary-btn, .danger-btn {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ==========================================
   BREAKPOINTS: DESKTOP LAYOUT (>= 1024px)
   ========================================== */
@media (min-width: 1024px) {
    .app-layout {
        grid-template-columns: 280px 1fr 0px;
    }
    .app-layout:has(.sidebar-right.open) {
        grid-template-columns: 280px 1fr 340px;
    }
    .sidebar-right {
        position: relative;
        right: 0;
        width: 340px;
    }
    .sidebar {
        transform: translateX(0) !important;
        position: relative !important;
        width: 280px !important;
    }
    .mobile-header {
        display: none !important;
    }
}

/* ==========================================
   BREAKPOINTS: TABLET LAYOUT (640px to 1023px)
   ========================================== */
@media (min-width: 640px) and (max-width: 1023px) {
    .app-layout {
        grid-template-columns: 240px 1fr 0px;
        height: 100vh;
        height: 100dvh;
    }
    .app-layout.sidebar-left-collapsed {
        grid-template-columns: 0px 1fr 0px !important;
    }
    
    .sidebar {
        position: relative;
        width: 240px;
        transition: transform 0.2s ease-in-out;
    }
    
    .app-layout.sidebar-left-collapsed .sidebar {
        transform: translateX(-100%);
        position: absolute;
        height: 100%;
    }
    
    .sidebar-right {
        position: fixed;
        top: 0;
        right: -340px;
        width: 340px;
        height: 100%;
        height: 100dvh;
        z-index: 100;
        box-shadow: -4px 0 15px rgba(0, 0, 0, 0.08);
        transition: right 0.2s ease-in-out;
    }
    
    .sidebar-right.open {
        position: fixed !important;
        right: 0 !important;
    }
    
    .mobile-header {
        display: flex;
    }
    
    .view-panel > .view-header {
        display: none !important; /* Hide view-specific header to avoid duplicate headers */
    }

    .view-body {
        padding: 20px;
        gap: 16px;
    }
    
    .kb-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .table-container {
        margin-top: 16px;
    }
}

/* ==========================================
   BREAKPOINTS: MOBILE LAYOUT (< 640px)
   ========================================== */
@media (max-width: 639px) {
    .app-layout {
        grid-template-columns: 1fr;
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
    }
    
    /* Left Sidebar as a Slide-out Drawer */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 280px;
        height: 100%;
        height: 100dvh;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 4px 0 15px rgba(0, 0, 0, 0.08);
    }
    
    .app-layout.sidebar-left-open .sidebar {
        transform: translateX(0);
    }
    
    /* Right Sidebar as full-width slide-out drawer */
    .sidebar-right {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100%;
        height: 100dvh;
        z-index: 100;
        transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .sidebar-right.open {
        position: fixed !important;
        right: 0 !important;
    }
    
    .mobile-header {
        display: flex;
    }
    
    .view-panel > .view-header {
        display: none !important;
    }
    
    .view-body {
        padding: 16px 12px;
        gap: 16px;
    }
    
    .messages-window {
        padding: 12px 12px 20px 12px;
        gap: 12px;
    }
    
    .message {
        max-width: 92%;
    }
    
    .chat-input-area {
        padding: 10px 12px;
        padding-bottom: calc(10px + env(safe-area-inset-bottom));
    }
    
    .chat-input-row {
        gap: 8px;
    }
    
    .input-form {
        padding: 8px 10px;
    }
    
    .input-caution-text {
        font-size: 10px;
        margin-top: 6px;
        text-align: center;
    }
    
    /* Grid & Cards vertical stacking */
    .kb-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .kb-card {
        padding: 16px;
    }
    
    .kb-card-metrics {
        grid-template-columns: repeat(3, 1fr);
        padding: 8px 0;
    }
    
    .kb-card-metrics .label {
        font-size: 8px;
    }
    
    .kb-card-metrics .val {
        font-size: 11px;
    }
    
    .document-manager, .settings-manager {
        max-width: 100%;
        align-self: stretch;
    }
    
    .upload-zone {
        padding: 20px 16px;
    }
    
    .table-container {
        margin-top: 12px;
    }
    
    .table-header-row {
        padding: 10px 12px;
    }
    
    .table-header-row h3 {
        font-size: 13px;
    }
    
    .data-table {
        min-width: 650px; /* force scrolling instead of crushing */
    }
    
    .settings-card {
        padding: 16px;
    }
    
    .form-actions {
        flex-direction: column;
        gap: 8px;
    }
    
    .form-actions button {
        width: 100%;
        min-height: 44px;
    }
    
    /* Touch Targets */
    .primary-btn, .secondary-btn, .danger-btn, .new-chat-btn {
        min-height: 44px;
        width: 100%;
    }
    
    .new-chat-btn {
        margin-bottom: 8px;
    }
    
    .nav-item {
        padding: 12px 16px;
        min-height: 46px;
    }
    
    /* Modals spacing */
    .showcase-modal-card {
        width: 92%;
        padding: 24px 16px;
        gap: 16px;
    }
    
    .showcase-modal-card-header h2 {
        font-size: 18px;
    }
    
    .showcase-modal-card-body {
        font-size: 13px;
        line-height: 1.5;
        gap: 8px;
        text-align: left;
    }
}

/* ==========================================
   SHOWCASE MODAL & FOOTER STYLES
   ========================================== */

/* Project Showcase Modal */
.showcase-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 12, 28, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.showcase-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.showcase-modal-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 90%;
    max-width: 480px;
    padding: 32px 24px;
    box-shadow: 0 20px 25px -5px rgba(124, 58, 237, 0.15), 0 10px 10px -5px rgba(124, 58, 237, 0.05);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: relative;
    overflow: hidden;
}

.showcase-modal-overlay.active .showcase-modal-card {
    transform: translateY(0) scale(1);
}

.showcase-modal-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-purple), var(--primary-purple-hover));
}

.showcase-modal-card-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
}

.showcase-modal-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--light-purple);
    color: var(--primary-purple);
    display: flex;
    align-items: center;
    justify-content: center;
}

.showcase-modal-icon-wrapper svg {
    width: 28px;
    height: 28px;
}

.showcase-modal-card-header h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.showcase-modal-card-body {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: justify;
}

.showcase-modal-card-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

.showcase-modal-card-footer {
    display: flex;
    justify-content: center;
    margin-top: 8px;
}

.showcase-modal-card-footer button {
    padding: 12px 28px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
}

/* Sidebar Footer & Copyright */
.sidebar-footer {
    margin-top: 8px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 11px;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.5;
}

.sidebar-footer p {
    margin: 2px 0;
}

.sidebar-footer .copyright {
    font-weight: 600;
    color: var(--text-secondary);
}

.sidebar-footer .contact a {
    color: var(--primary-purple);
    text-decoration: none;
    transition: var(--transition-fast);
}

.sidebar-footer .contact a:hover {
    color: var(--primary-purple-hover);
    text-decoration: underline;
}

/* Responsive Footer styling when sidebar items flow differently or are stacked */
@media (max-width: 639px) {
    .sidebar-footer {
        margin-top: 8px;
        padding-top: 12px;
        display: flex;
        flex-direction: column;
        gap: 4px;
        text-align: center;
        width: 100%;
    }
}