* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-main: #0b0f19;
    --bg-card: #111827;
    --bg-card-hover: #1f2937;
    --border: #374151;
    --border-subtle: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.2);
    --accent-hover: #2563eb;
    --success: #10b981;
    --purple: #8b5cf6;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-card);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    flex-shrink: 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
    padding: 0 8px;
}

.brand-icon {
    font-size: 28px;
}

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

.badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 2px 8px;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex-grow: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}

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

.nav-item.active {
    background-color: var(--accent-glow);
    color: var(--accent);
    font-weight: 600;
    border-left: 3px solid var(--accent);
}

.sidebar-stats {
    background-color: rgba(17, 24, 39, 0.7);
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    padding: 14px;
    margin-bottom: 16px;
}

.sidebar-stats h4 {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

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

.sidebar-footer {
    padding-top: 12px;
    border-top: 1px solid var(--border-subtle);
}

.github-link {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.github-link:hover {
    color: var(--text-primary);
}

/* Main Content */
.main-content {
    flex-grow: 1;
    padding: 36px 48px;
    overflow-y: auto;
    max-width: 1200px;
}

.content-header {
    margin-bottom: 24px;
}

.content-header h1 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 8px;
}

.content-header p {
    color: var(--text-secondary);
    font-size: 15px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Search Box & Inputs */
.search-box-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
}

.search-input-wrapper {
    display: flex;
    gap: 12px;
}

.search-input-wrapper input {
    flex-grow: 1;
    background: var(--bg-main);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s;
}

.search-input-wrapper input:focus {
    border-color: var(--accent);
}

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 24px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
}

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

.sample-queries {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--text-muted);
}

.sample-pill {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.sample-pill:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

/* Answer Section */
.answer-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

.answer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.answer-header h3 {
    font-size: 17px;
    font-weight: 600;
}

.answer-metrics {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--text-muted);
}

.answer-metrics strong {
    color: var(--success);
}

.answer-body {
    font-size: 15px;
    color: #e5e7eb;
    margin-bottom: 20px;
    line-height: 1.6;
}

.sources-list {
    border-top: 1px solid var(--border-subtle);
    padding-top: 16px;
}

.sources-list h4 {
    font-size: 13px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}

.source-item {
    background: var(--bg-main);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
    font-size: 13px;
}

.source-item .source-title {
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 4px;
}

/* Inspector Layout */
.inspector-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.inspector-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.inspector-card h3 {
    font-size: 16px;
    margin-bottom: 4px;
}

.subtitle {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.results-mini-list .mini-item {
    background: var(--bg-main);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    padding: 10px;
    margin-bottom: 8px;
    font-size: 12px;
}

.mini-item .meta-row {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.mini-item .score-badge {
    color: var(--accent);
}

.rrf-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.fused-item {
    background: var(--bg-main);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 10px;
    font-size: 13px;
}

.fused-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-weight: 600;
}

/* Knowledge Base */
.kb-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.kb-list-pane, .kb-add-pane {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.kb-doc-card {
    background: var(--bg-main);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 12px;
}

.kb-doc-card h4 {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.kb-doc-card p {
    font-size: 12px;
    color: var(--text-secondary);
}

.form-input, .form-textarea {
    width: 100%;
    background: var(--bg-main);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 14px;
    margin-bottom: 14px;
    outline: none;
    font-family: inherit;
}

/* Architecture Cards */
.architecture-cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.arch-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.arch-step {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    color: var(--purple);
    background: rgba(139, 92, 246, 0.15);
    padding: 2px 8px;
    border-radius: 6px;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.arch-card h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

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

.transparency-card {
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 12px;
    padding: 20px;
}

.transparency-card h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--accent);
}

.transparency-card p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.transparency-card a {
    color: var(--accent);
}