/* ============================================================
   COFFlow - Modern Dark Theme
   A sleek, professional interface for COF generation
   ============================================================ */

:root {
    /* Color Palette - Deep Ocean */
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2234;
    --bg-elevated: #1e293b;
    --bg-hover: #243044;
    
    /* Accent Colors */
    --accent-primary: #06b6d4;
    --accent-secondary: #22d3ee;
    --accent-tertiary: #67e8f9;
    --accent-glow: rgba(6, 182, 212, 0.3);
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --text-muted: #475569;
    
    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Borders */
    --border-color: rgba(148, 163, 184, 0.1);
    --border-active: rgba(6, 182, 212, 0.5);
    
    /* Typography */
    --font-display: 'Outfit', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--accent-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-display);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================================
   Ambient Background
   ============================================================ */
.ambient-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #8b5cf6 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, #06b6d4 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

/* ============================================================
   Header
   ============================================================ */
.main-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background: rgba(10, 14, 23, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: inherit;
    text-decoration: none;
    min-width: 0;
}

.app-logo {
    display: block;
    height: 38px;
    width: auto;
    object-fit: contain;
    filter: brightness(1.04) saturate(1.05);
}

[data-theme="light"] .app-logo {
    filter: saturate(1.02);
}

.app-title {
    font-size: 1.2rem;
    font-weight: 700;
    background: linear-gradient(90deg, #1a365d, #2d8a8a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.nav-link.active {
    color: var(--accent-primary);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: pulse 2s ease-in-out infinite;
}

.status-indicator.online .status-dot {
    background: var(--success);
}

.status-indicator.offline .status-dot {
    background: var(--error);
}

.status-indicator.gpu .status-dot {
    background: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-glow);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================================================
   Main Content Layout
   ============================================================ */
.main-content {
    display: grid;
    grid-template-columns: 2fr 4fr 4fr;
    gap: var(--space-md);
    padding: var(--space-md);
    height: calc(100vh - 72px);
    position: relative;
    z-index: 1;
}

/* ============================================================
   Panels
   ============================================================ */
.panel {
    background: rgba(17, 24, 39, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Collapsible sections */
.collapsible-header {
    cursor: pointer;
    user-select: none;
}

.collapsible-header .collapse-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.collapsible-header .collapse-arrow {
    transition: transform var(--transition-fast);
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.collapsible-header.collapsed .collapse-arrow {
    transform: rotate(-90deg);
}

.collapsible-content {
    transition: max-height 0.3s ease, opacity 0.2s ease;
    overflow: hidden;
}

.collapsible-content.collapsed {
    max-height: 0 !important;
    opacity: 0;
    overflow: hidden;
    padding-top: 0;
    padding-bottom: 0;
    margin-top: 0;
    margin-bottom: 0;
}

/* Custom DB header styling inside upload section */
.bb-upload-section .collapsible-header {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    margin-bottom: var(--space-sm);
    border: none;
    padding: 0;
    background: transparent;
}

.bb-upload-section .collapsible-header:hover {
    color: var(--accent-primary);
}

/* ============================================================
   Building Blocks Panel
   ============================================================ */
.building-blocks-panel {
    max-height: 100%;
}

/* The main DB collapsible section takes all remaining flex space between
   the panel header and the custom BB upload section */
.building-blocks-panel > .collapsible-content {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

/* Tabs, search, and filter rows don't shrink — only the list scrolls */
.building-blocks-panel .bb-category-tabs,
.building-blocks-panel .bb-search-container,
.building-blocks-panel .cp-filter-container,
.building-blocks-panel .atom-filter-container {
    flex-shrink: 0;
}

/* Upload section is pinned at the bottom and never overlaps the list */
.building-blocks-panel .bb-upload-section {
    flex-shrink: 0;
}

.directory-input {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.directory-input label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-xs);
}

.input-group {
    display: flex;
    gap: var(--space-sm);
}

.input-group input {
    flex: 1;
    min-width: 0;
}

.bb-list-container {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: var(--space-sm);
}

.bb-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.bb-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.bb-item:hover {
    background: var(--bg-hover);
    border-color: var(--border-active);
}

.bb-item.selected {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--accent-primary);
}

.bb-item.added {
    border-color: var(--success);
}

.bb-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    flex-shrink: 0;
}

.bb-icon.linker {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.bb-icon.node {
    background: rgba(139, 92, 246, 0.15);
    color: #8b5cf6;
}

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

.bb-name {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.bb-meta {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

.bb-actions {
    display: flex;
    gap: var(--space-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.bb-item:hover .bb-actions {
    opacity: 1;
}

.upload-section {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-color);
}

.upload-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.upload-label:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(6, 182, 212, 0.05);
}

.upload-label svg {
    width: 20px;
    height: 20px;
}

/* ============================================================
   Center Panel - Tabs
   ============================================================ */
.center-panel {
    display: flex;
    flex-direction: column;
}

.tabs {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.tab {
    padding: var(--space-sm) var(--space-lg);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.tab.active {
    color: var(--accent-primary);
    background: rgba(6, 182, 212, 0.1);
}

.tab-content {
    display: none;
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
}

.tab-content.active {
    display: block;
}

/* ============================================================
   Configure Tab
   ============================================================ */
.config-section {
    margin-bottom: var(--space-xl);
}

.config-section h3 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-md);
}

.selected-bbs {
    min-height: 200px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-md);
}

.selected-bb-item {
    display: grid;
    grid-template-columns: 6px 1fr auto auto auto;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.selected-bb-item:hover {
    background: var(--bg-hover);
}

.selected-bb-item:last-child {
    margin-bottom: 0;
}

.selected-bb-name {
    font-size: 0.7rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

.selected-bb-count {
    display: flex;
    align-items: center;
    gap: 2px;
    flex-shrink: 0;
}

.count-input {
    width: 50px;
    text-align: center;
    padding: var(--space-xs) var(--space-sm);
}

.remove-bb {
    color: var(--text-tertiary);
    cursor: pointer;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.remove-bb svg {
    width: 12px;
    height: 12px;
}

.remove-bb:hover {
    color: var(--error);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-tertiary);
    text-align: center;
}

.empty-state svg {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9rem;
}

.param-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.param-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.param-item label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.param-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.stepper {
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.stepper-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.stepper input {
    width: 60px;
    text-align: center;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
}

.stepper input:focus {
    outline: none;
}

.action-bar {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* Model Selector */
.model-selector-container {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.model-selector-container label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.model-dropdown {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.model-dropdown:hover {
    border-color: var(--accent-primary);
}

.model-dropdown:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

[data-theme="light"] .model-dropdown {
    background: var(--bg-secondary);
}

/* ============================================================
   Preview Tab - 3D Viewer
   ============================================================ */
.viewer-container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.viewer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.viewer-header span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.viewer-controls {
    display: flex;
    gap: var(--space-xs);
}

.viewer-3d {
    flex: 1;
    min-height: 400px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
}

.viewer-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.viewer-placeholder svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--space-md);
    opacity: 0.3;
}

.atom-info {
    display: flex;
    gap: var(--space-xl);
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.info-row {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.info-label {
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

.info-value {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-weight: 500;
}

/* ============================================================
   Results Tab
   ============================================================ */
.results-container {
    min-height: 400px;
}

.result-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
}

.result-card h4 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
    color: var(--accent-primary);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.stat-item {
    text-align: center;
    padding: var(--space-md);
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: var(--space-xs);
}

/* ============================================================
   Output Panel
   ============================================================ */
.output-panel {
    display: flex;
    flex-direction: column;
    max-height: 100%;
}

.output-panel-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.output-viewer {
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
}

.output-tabs {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.output-tab {
    flex: 1;
    padding: var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.output-tab:hover {
    border-color: var(--border-active);
}

.output-tab.active {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.output-viewer .viewer-3d {
    flex: 1;
    min-height: 350px;
}

.lattice-params {
    padding: var(--space-md);
    border-top: 1px solid var(--border-color);
}

.lattice-params h4 {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-md);
}

.lattice-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

.lattice-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.lattice-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.lattice-value {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
}

.download-section {
    padding: var(--space-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--border-active);
    color: var(--text-primary);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
}

.btn-small {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.8rem;
}

.btn-small svg {
    width: 14px;
    height: 14px;
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #0891b2);
    border-color: transparent;
    color: var(--bg-primary);
    font-weight: 600;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: transparent;
    border-color: var(--border-color);
}

.btn-accent {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-accent:hover:not(:disabled) {
    background: rgba(6, 182, 212, 0.2);
}

/* ============================================================
   Form Elements
   ============================================================ */
input[type="text"],
input[type="number"] {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="text"]::placeholder {
    color: var(--text-muted);
}

/* ============================================================
   Progress Overlay
   ============================================================ */
.progress-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

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

.progress-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    max-width: 400px;
}

.progress-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid var(--bg-elevated);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    margin: 0 auto var(--space-lg);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.progress-modal h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.progress-modal p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.progress-bar {
    height: 4px;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    width: 0%;
    transition: width var(--transition-slow);
}

/* ============================================================
   Toast Notifications
   ============================================================ */
.toast-container {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    z-index: 1001;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-color: var(--success);
}

.toast.error {
    border-color: var(--error);
}

.toast.info {
    border-color: var(--info);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-icon {
    width: 20px;
    height: 20px;
}

.toast.success .toast-icon {
    color: var(--success);
}

.toast.error .toast-icon {
    color: var(--error);
}

.toast.info .toast-icon {
    color: var(--info);
}

.toast-message {
    flex: 1;
    font-size: 0.9rem;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--space-xs);
}

.toast-close:hover {
    color: var(--text-primary);
}

/* ============================================================
   Loading States
   ============================================================ */
.loading-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    color: var(--text-tertiary);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--bg-elevated);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: var(--space-md);
}

/* ============================================================
   Scrollbar
   ============================================================ */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1400px) {
    .main-content {
        grid-template-columns: 2fr 4fr 4fr;
    }
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 2fr 4fr 4fr;
    }
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        height: auto;
    }
    
    .panel {
        max-height: 500px;
    }
    
    .output-panel-content {
        max-height: 600px;
    }
}

@media (max-width: 760px) {
    .main-header {
        padding: var(--space-sm) var(--space-md);
        gap: var(--space-sm);
    }

    .header-brand {
        gap: 8px;
    }

    .app-logo {
        height: 34px;
    }

    .nav-links {
        display: none;
    }

    .app-title {
        font-size: 1.2rem;
    }

    .header-actions {
        gap: var(--space-sm);
    }
}

/* ============================================================
   Validation Status
   ============================================================ */
.validation-section {
    margin-top: var(--space-lg);
    padding: var(--space-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.validation-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.validation-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
}

.validation-badge.valid {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.validation-badge.invalid {
    background: rgba(239, 68, 68, 0.15);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.validation-badge.warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.validation-badge svg {
    width: 16px;
    height: 16px;
}

.validation-message {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--text-muted);
}

.validation-message.valid {
    border-left-color: var(--success);
}

.validation-message.invalid {
    border-left-color: var(--error);
}

.validation-message.warning {
    border-left-color: var(--warning);
}

.validation-checks {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.validation-check {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.check-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    flex-shrink: 0;
}

.check-icon.ok {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.check-icon.fail {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error);
}

.check-icon.warn {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.check-icon.pending {
    background: var(--bg-hover);
    color: var(--text-muted);
}

.check-icon svg {
    width: 12px;
    height: 12px;
}

.check-name {
    color: var(--text-secondary);
    min-width: 140px;
}

.check-message {
    color: var(--text-tertiary);
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.score-section .validation-header {
    justify-content: space-between;
}

.score-pill {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.3);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
}

.score-summary {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.score-earned {
    min-width: 64px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-align: right;
}

.score-note {
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border-left: 3px solid var(--warning);
    border-radius: var(--radius-sm);
    background: rgba(245, 158, 11, 0.12);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.validation-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-tertiary);
    font-size: 0.85rem;
    cursor: pointer;
    margin-top: var(--space-md);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.validation-toggle:hover {
    color: var(--text-secondary);
    background: var(--bg-hover);
}

.validation-toggle svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.validation-toggle.expanded svg {
    transform: rotate(180deg);
}

.validation-details {
    display: none;
    margin-top: var(--space-md);
}

.validation-details.visible {
    display: block;
}

/* Result card with validation */
.result-card.with-validation {
    border-left: 4px solid var(--text-muted);
}

.result-card.with-validation.valid {
    border-left-color: var(--success);
}

.result-card.with-validation.invalid {
    border-left-color: var(--error);
}

.result-card.with-validation.warning {
    border-left-color: var(--warning);
}

/* ============================================================
   Building Blocks Category Tabs
   ============================================================ */
.bb-category-tabs {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.bb-category-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.bb-category-tab:hover {
    border-color: var(--border-active);
    background: var(--bg-hover);
}

.bb-category-tab.active {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.bb-category-tab[data-category="linkers"].active {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success);
    color: var(--success);
}

.bb-category-tab[data-category="nodes"].active {
    background: rgba(139, 92, 246, 0.1);
    border-color: #8b5cf6;
    color: #8b5cf6;
}

.bb-category-tab svg {
    width: 16px;
    height: 16px;
}

.bb-count-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 var(--space-xs);
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-family: var(--font-mono);
}

.bb-category-tab.active .bb-count-badge {
    background: rgba(255, 255, 255, 0.15);
}

/* ============================================================
   Building Blocks Search
   ============================================================ */
.bb-search-container {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.bb-search-container svg {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.bb-search-container input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.9rem;
    padding: 0;
}

.bb-search-container input:focus {
    outline: none;
    box-shadow: none;
}

.bb-search-container input::placeholder {
    color: var(--text-muted);
}

/* ============================================================
   Custom Fragment Upload
   ============================================================ */
.bb-upload-section {
    padding: var(--space-md) var(--space-md);
    background: var(--bg-tertiary);
}

.bb-upload-section .upload-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    margin-bottom: var(--space-sm);
    /* Override generic .upload-label styles - this is a collapsible header */
    border: none;
    padding: 0;
    cursor: pointer;
    background: transparent;
}

.bb-upload-section .upload-label:hover {
    border: none;
    color: var(--accent-primary);
    background: transparent;
}

.upload-drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-md);
    border: 1.5px dashed var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    min-height: 64px;
}

.upload-drop-zone:hover,
.upload-drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.05);
}

.upload-drop-zone .upload-icon {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
}

.upload-btn-label {
    color: var(--accent);
    cursor: pointer;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.upload-btn-label:hover {
    color: var(--accent-hover);
}

.upload-file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    margin-bottom: var(--space-xs);
}

.upload-filename {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.upload-clear-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    padding: 0 2px;
    flex-shrink: 0;
}

.upload-clear-btn:hover {
    color: var(--danger);
}

.upload-controls {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
}

.upload-type-selector {
    display: flex;
    gap: 2px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: 2px;
}

.upload-type-btn {
    flex: 1;
    padding: 6px 8px;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    font-size: 0.72rem;
    font-weight: 500;
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all 0.15s;
}

.upload-type-btn:hover {
    color: var(--text-primary);
}

.upload-type-btn.active {
    background: var(--accent);
    color: white;
}

.upload-submit-btn {
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: var(--accent);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s;
}

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

.upload-submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.upload-status {
    font-size: 0.7rem;
    padding: var(--space-xs) 0;
    text-align: center;
}

.upload-status.success {
    color: var(--success);
}

.upload-status.error {
    color: var(--danger);
}

/* ============================================================
   User Database Section
   ============================================================ */
.user-db-section {
    margin-bottom: var(--space-sm);
}

.user-db-selector {
    display: flex;
    gap: var(--space-xs);
    align-items: center;
}

.user-db-dropdown {
    flex: 1;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-family: var(--font-main);
    cursor: pointer;
    outline: none;
}

.user-db-dropdown:focus {
    border-color: var(--accent);
}

#create-db-btn {
    width: 28px;
    height: 28px;
    padding: 0;
    font-size: 1.1rem;
    font-weight: 600;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
}

#create-db-btn:hover {
    opacity: 0.9;
}

/* User's Building Blocks List */
.user-bb-section {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-color);
}

.user-bb-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.user-bb-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
}

.user-bb-db-name {
    font-size: 0.7rem;
    color: var(--accent);
    font-weight: 500;
}

#delete-db-btn {
    margin-left: auto;
    color: var(--text-muted);
    background: transparent;
    border: none;
    padding: 4px;
    cursor: pointer;
}

#delete-db-btn:hover {
    color: var(--danger);
}

.user-bb-tabs {
    display: flex;
    gap: 2px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: 2px;
    margin-bottom: var(--space-sm);
}

.user-bb-tab {
    flex: 1;
    padding: 5px 8px;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    font-size: 0.7rem;
    font-weight: 500;
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all 0.15s;
}

.user-bb-tab:hover {
    color: var(--text-primary);
}

.user-bb-tab.active {
    background: var(--accent);
    color: white;
}

.user-bb-list {
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.user-bb-list::-webkit-scrollbar {
    width: 6px;
}

.user-bb-list::-webkit-scrollbar-track {
    background: transparent;
}

.user-bb-list::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.user-bb-list::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-tertiary);
}

.user-bb-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 6px 8px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s;
}

.user-bb-item:hover {
    background: var(--bg-tertiary);
}

.user-bb-item.added {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.user-bb-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xs);
    font-size: 0.65rem;
    font-weight: 700;
}

.user-bb-icon.linker {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-primary);
}

.user-bb-icon.node {
    background: rgba(139, 92, 246, 0.15);
    color: #8b5cf6;
}

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

.user-bb-name {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-bb-meta {
    font-size: 0.65rem;
    color: var(--text-muted);
}

.user-bb-actions {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.15s;
}

.user-bb-item:hover .user-bb-actions {
    opacity: 1;
}

.user-bb-actions .add-btn {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    font-weight: 700;
}

.user-bb-actions .add-btn:hover {
    background: var(--accent-primary);
    color: white;
}

.user-bb-actions .delete-btn {
    color: var(--error);
    border-color: var(--error);
}

.user-bb-actions .delete-btn:hover {
    background: var(--error);
    color: white;
}

.user-bb-actions .preview-btn {
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.user-bb-actions .preview-btn:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Light mode - user BB action buttons */
[data-theme="light"] .user-bb-actions .add-btn {
    background: rgba(8, 145, 178, 0.1);
    color: #0e7490;
    border-color: #0e7490;
}

[data-theme="light"] .user-bb-actions .add-btn:hover {
    background: var(--accent-primary);
    color: white;
}

[data-theme="light"] .user-bb-actions .delete-btn {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    border-color: #dc2626;
}

[data-theme="light"] .user-bb-actions .delete-btn:hover {
    background: var(--error);
    color: white;
}

[data-theme="light"] .user-bb-actions .preview-btn {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-color: rgba(71, 85, 105, 0.3);
}

[data-theme="light"] .user-bb-actions .preview-btn:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Modal styles */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1100;
}

.modal-dialog {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    max-width: 420px;
    width: 90%;
}

.modal-dialog h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.modal-dialog p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.modal-input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: var(--font-main);
    outline: none;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

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

textarea.modal-input {
    resize: vertical;
    min-height: 40px;
}

.modal-actions {
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
    margin-top: var(--space-lg);
}

.modal-cancel-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-danger {
    background: var(--error);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
}

.btn-danger:hover {
    opacity: 0.9;
}

/* Recipe form */
.recipe-dialog {
    max-width: 480px;
}

.recipe-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.recipe-field-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-top: var(--space-xs);
}

.recipe-bb-summary {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    font-family: var(--font-mono);
    line-height: 1.6;
}

/* Upload CP selector */
.upload-cp-selector {
    margin-top: var(--space-xs);
}

.upload-cp-label {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    margin-bottom: 4px;
}

.upload-cp-buttons {
    display: flex;
    gap: 2px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: 2px;
}

.upload-cp-btn {
    flex: 1;
    padding: 5px 6px;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    font-size: 0.7rem;
    font-weight: 500;
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all 0.15s;
}

.upload-cp-btn:hover {
    color: var(--text-primary);
}

.upload-cp-btn.active {
    background: #8b5cf6;
    color: white;
}
.config-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-sm);
}

.config-section-header h3 {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0;
}

.config-section-header h3 svg {
    width: 14px;
    height: 14px;
}

.section-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 var(--space-xs);
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-secondary);
}

/* ============================================================
   Selected Building Blocks Sections
   ============================================================ */
.selected-bbs.linkers-section {
    border-color: rgba(16, 185, 129, 0.3);
}

.selected-bbs.nodes-section {
    border-color: rgba(139, 92, 246, 0.3);
}

.selected-bbs {
    min-height: 100px;
}

.empty-state.small {
    padding: var(--space-lg);
}

.empty-state.small svg {
    display: none;
}

.empty-state.small p {
    font-size: 0.85rem;
}

/* ============================================================
   Generation Summary
   ============================================================ */
.generation-summary {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
}

.summary-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.summary-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.summary-value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--accent-primary);
}

/* ============================================================
   BB Item Type Indicators
   ============================================================ */
.bb-item.linker-type {
    border-left: 3px solid var(--success);
}

.bb-item.node-type {
    border-left: 3px solid #8b5cf6;
}

.bb-item .bb-type-badge {
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-transform: uppercase;
}

.bb-item .bb-type-badge.linker {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.bb-item .bb-type-badge.node {
    background: rgba(139, 92, 246, 0.2);
    color: #8b5cf6;
}

/* ============================================================
   Selected BB Item with Type
   ============================================================ */
.selected-bb-item.linker-type {
    border-left: 3px solid var(--success);
}

.selected-bb-item.node-type {
    border-left: 3px solid #8b5cf6;
}

.selected-bb-item .bb-type-indicator {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.selected-bb-item .bb-type-indicator.linker {
    background: var(--success);
}

.selected-bb-item .bb-type-indicator.node {
    background: #8b5cf6;
}

/* ============================================================
   Count Buttons (+ / -)
   ============================================================ */
.selected-bb-count {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.count-btn {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
    line-height: 1;
}

.count-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.count-btn:active {
    transform: scale(0.95);
}

.count-btn.minus:hover {
    border-color: var(--error);
    color: var(--error);
}

.count-btn.plus:hover {
    border-color: var(--success);
    color: var(--success);
}

.count-value {
    min-width: 14px;
    text-align: center;
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.7rem;
    color: var(--text-primary);
}

/* ============================================================
   BB Item Viewing Indicator
   ============================================================ */
.bb-item.viewing {
    background: rgba(6, 182, 212, 0.15) !important;
    border-color: var(--accent-primary) !important;
    box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.3);
}

.bb-item.viewing.linker-type {
    background: rgba(16, 185, 129, 0.15) !important;
    border-color: var(--success) !important;
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.3);
}

.bb-item.viewing.node-type {
    background: rgba(139, 92, 246, 0.15) !important;
    border-color: #8b5cf6 !important;
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.3);
}

/* Selected BB Item Viewing Indicator */
.selected-bb-item.viewing {
    background: rgba(6, 182, 212, 0.2) !important;
    border-color: var(--accent-primary) !important;
    box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.3);
}

.selected-bb-item.viewing.linker-type {
    background: rgba(16, 185, 129, 0.2) !important;
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.3);
}

.selected-bb-item.viewing.node-type {
    background: rgba(139, 92, 246, 0.2) !important;
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.3);
}

/* ============================================================
   Config Selected Container with Preview
   ============================================================ */
.config-selected-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.config-row {
    display: grid;
    grid-template-columns: 1fr 140px;
    gap: var(--space-sm);
    align-items: stretch;
}

.config-row .selected-section {
    min-height: 80px;
    max-height: 110px;
    overflow-y: auto;
}

.config-row.linker-row {
    border-left: 3px solid var(--success);
    padding-left: var(--space-sm);
}

.config-row.node-row {
    border-left: 3px solid #8b5cf6;
    padding-left: var(--space-sm);
}

.config-preview-section {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.config-preview-section.linker-preview {
    border-color: rgba(16, 185, 129, 0.3);
}

.config-preview-section.node-preview {
    border-color: rgba(139, 92, 246, 0.3);
}

.config-preview-header {
    padding: 4px var(--space-sm);
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.65rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.config-viewer .viewer-placeholder {
    padding: var(--space-sm);
}

.config-viewer .viewer-placeholder svg {
    width: 24px;
    height: 24px;
}

.config-viewer .viewer-placeholder p {
    font-size: 0.65rem;
    margin-top: var(--space-xs);
}

.config-viewer {
    flex: 1;
    min-height: 100px;
}

/* ============================================================
   Supercell XYZ Controls
   ============================================================ */
.supercell-param {
    grid-column: 1 / -1;
}

.supercell-controls {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-top: var(--space-sm);
}

.supercell-axis {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.axis-label {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--accent-primary);
    min-width: 20px;
}

.stepper-small {
    display: flex;
    align-items: center;
    gap: 4px;
}

.stepper-small .stepper-btn {
    width: 24px;
    height: 24px;
    padding: 0;
    font-size: 0.9rem;
}

.stepper-small input {
    width: 36px;
    height: 24px;
    padding: 2px 4px;
    font-size: 0.8rem;
    text-align: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.stepper-small input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* ============================================================
   Connection Points Badge
   ============================================================ */
.connection-points-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1px 4px;
    border-radius: var(--radius-sm);
    font-size: 0.55rem;
    font-weight: 600;
    font-family: var(--font-mono);
    text-transform: uppercase;
    flex-shrink: 0;
    min-width: 28px;
}

.connection-points-badge.linker {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.connection-points-badge.node {
    background: rgba(139, 92, 246, 0.2);
    color: #8b5cf6;
}

/* Connection Points Highlight in BB List */
.cp-highlight {
    font-weight: 600;
}

.cp-highlight.linker {
    color: var(--success);
}

.cp-highlight.node {
    color: #8b5cf6;
}

/* ============================================================
   Connection Points Filter
   ============================================================ */
.cp-filter-container {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.cp-filter-label {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-xs);
}

.cp-filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.cp-filter-btn {
    padding: 4px 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.cp-filter-btn:hover {
    border-color: #8b5cf6;
    color: #8b5cf6;
}

.cp-filter-btn.active {
    background: rgba(139, 92, 246, 0.15);
    border-color: #8b5cf6;
    color: #8b5cf6;
}

/* ============================================================
   Atom Count Filter (for Linkers)
   ============================================================ */
.atom-filter-container {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.atom-filter-label {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-xs);
}

.atom-filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.atom-filter-btn {
    padding: 4px 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.atom-filter-btn:hover {
    border-color: var(--success);
    color: var(--success);
}

.atom-filter-btn.active {
    background: rgba(16, 185, 129, 0.15);
    border-color: var(--success);
    color: var(--success);
}

/* ============================================================
   Header Actions
   ============================================================ */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.theme-toggle {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.theme-toggle:hover {
    background: var(--bg-hover);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

/* ============================================================
   Light Mode Theme
   ============================================================ */
[data-theme="light"] {
    /* Color Palette - Light */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-elevated: #e2e8f0;
    --bg-hover: #cbd5e1;
    
    /* Accent Colors - slightly darker for visibility */
    --accent-primary: #0891b2;
    --accent-secondary: #06b6d4;
    --accent-tertiary: #22d3ee;
    --accent-glow: rgba(8, 145, 178, 0.2);
    
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-muted: #94a3b8;
    
    /* Borders */
    --border-color: rgba(71, 85, 105, 0.2);
    --border-active: rgba(8, 145, 178, 0.5);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px var(--accent-glow);
}

[data-theme="light"] .ambient-bg {
    opacity: 0.15;
}

[data-theme="light"] .gradient-orb {
    opacity: 0.2;
}

[data-theme="light"] .main-header {
    background: rgba(255, 255, 255, 0.9);
    border-bottom-color: var(--border-color);
}

[data-theme="light"] .panel {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-md);
}

[data-theme="light"] .viewer-3d {
    background: #e2e8f0;
}

[data-theme="light"] .bb-item {
    background: var(--bg-tertiary);
}

[data-theme="light"] .bb-item:hover {
    background: var(--bg-hover);
}

[data-theme="light"] .selected-bb-item {
    background: var(--bg-tertiary);
}

[data-theme="light"] .toast {
    background: var(--bg-secondary);
    box-shadow: var(--shadow-lg);
}

[data-theme="light"] .progress-modal {
    background: var(--bg-secondary);
    box-shadow: var(--shadow-lg);
}

[data-theme="light"] .result-card {
    background: var(--bg-tertiary);
}

[data-theme="light"] .validation-section {
    background: var(--bg-tertiary);
}

[data-theme="light"] .btn {
    background: var(--bg-tertiary);
}

[data-theme="light"] .btn:hover:not(:disabled) {
    background: var(--bg-hover);
}

[data-theme="light"] .btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #0e7490);
    color: white;
}

[data-theme="light"] .btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
}

[data-theme="light"] input[type="text"],
[data-theme="light"] input[type="number"] {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

[data-theme="light"] .stepper {
    background: var(--bg-secondary);
}

[data-theme="light"] .count-btn {
    background: var(--bg-secondary);
}

/* Light mode contrast fixes (WCAG AA) */
[data-theme="light"] .upload-submit-btn {
    background: #0e7490;
    color: white;
}

[data-theme="light"] .upload-submit-btn:hover:not(:disabled) {
    background: #0c6880;
}

[data-theme="light"] .user-bb-tab.active {
    background: #0e7490;
    color: white;
}

[data-theme="light"] .upload-type-btn.active {
    background: #0e7490;
    color: white;
}

[data-theme="light"] .btn-danger {
    background: #dc2626;
    color: white;
}

[data-theme="light"] .btn-danger:hover:not(:disabled) {
    background: #b91c1c;
    color: white;
}

/* ============================================================
   Examples Tab
   ============================================================ */
.examples-header {
    margin-bottom: 16px;
}

.examples-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.examples-description {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.5;
}

.examples-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.example-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px;
    transition: border-color var(--transition-fast);
}

.example-card:hover {
    border-color: var(--border-active);
}

.example-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.example-cof-id {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.example-summary {
    display: flex;
    gap: 8px;
    align-items: center;
}

.example-stat {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.example-stat.node {
    background: rgba(168, 85, 247, 0.15);
    color: #c084fc;
}

.example-stat.linker {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-secondary);
}

.example-stat.total {
    background: rgba(148, 163, 184, 0.1);
    color: var(--text-secondary);
}

.example-topology-badge {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    margin-left: 8px;
}

.example-bb-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 12px;
}

.example-bb-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    font-size: 0.8rem;
}

.example-bb-type-badge {
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.example-bb-type-badge.node {
    background: rgba(168, 85, 247, 0.2);
    color: #c084fc;
}

.example-bb-type-badge.linker {
    background: rgba(6, 182, 212, 0.2);
    color: var(--accent-secondary);
}

.example-bb-type-badge.unknown {
    background: rgba(148, 163, 184, 0.15);
    color: var(--text-secondary);
}

.example-bb-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.72rem;
}

.example-bb-meta {
    color: var(--text-tertiary);
    font-size: 0.7rem;
    flex-shrink: 0;
}

.example-bb-count {
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    flex-shrink: 0;
}

.example-card-actions {
    display: flex;
    justify-content: flex-end;
}

.btn-sm {
    padding: 6px 16px;
    font-size: 0.8rem;
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 8px;
}

/* ============================================================
   Documentation View
   ============================================================ */
.docs-view {
    display: none;
    flex: 1;
    overflow: hidden;
}

.docs-container {
    display: flex;
    width: 100%;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    gap: 0;
}

.docs-sidebar {
    width: 220px;
    flex-shrink: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 20px 0;
    overflow-y: auto;
}

.docs-sidebar h3 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0 20px;
    margin-bottom: 12px;
}

.docs-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.docs-nav-item {
    padding: 10px 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

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

.docs-nav-item.active {
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
    background: rgba(6, 182, 212, 0.05);
}

.docs-content {
    flex: 1;
    padding: 32px 40px;
    overflow-y: auto;
    color: var(--text-primary);
    line-height: 1.7;
}

.docs-content h1 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.docs-content h2 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 28px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.docs-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 20px;
    margin-bottom: 8px;
    color: var(--accent-secondary);
}

.docs-content p {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.docs-content strong {
    color: var(--text-primary);
}

.docs-content ul, .docs-content ol {
    padding-left: 24px;
    margin-bottom: 12px;
}

.docs-content li {
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.docs-content code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    color: var(--accent-secondary);
}

.docs-content pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 16px;
    overflow-x: auto;
}

.docs-content pre code {
    background: none;
    padding: 0;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.docs-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 16px;
    font-size: 0.85rem;
}

.docs-content th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
}

.docs-content td {
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.docs-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 24px 0;
}

.docs-content img.docs-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    margin: 12px 0;
    display: block;
}