/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Primary Colors - Purple Theme */
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Accent Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--gray-900);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
}

.section-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-900);
}

.form-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-800);
}

/* ===== LAYOUT ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== HEADER ===== */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.nav {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    background: transparent;
    color: var(--gray-600);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-btn:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.nav-btn.active {
    background: var(--primary-gradient);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

/* ===== MAIN CONTENT ===== */
.main {
    padding: var(--spacing-2xl) 0;
}

.tab-content {
    display: none;
}

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

/* ===== HERO SECTION ===== */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

/* ===== QUICK STATS ===== */
.quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-label {
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* ===== QUICK ACTIONS ===== */
.quick-actions {
    margin-bottom: var(--spacing-2xl);
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.action-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.action-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.action-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.action-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.action-card p {
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* ===== CARDS & FORMS ===== */
.form-section {
    margin-bottom: var(--spacing-xl);
}

.form-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

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

/* ===== FORM ELEMENTS ===== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--gray-700);
}

input, select, textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--white);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.1rem;
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
}

/* ===== UPLOAD AREA ===== */
.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: var(--gray-50);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-area i {
    font-size: 3rem;
    color: var(--gray-400);
    margin-bottom: var(--spacing-md);
}

.upload-link {
    color: var(--primary-color);
    cursor: pointer;
}

.upload-status {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
}

.upload-status.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.upload-status.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ===== PROGRESS BAR ===== */
.progress-container {
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.progress-details {
    background: var(--gray-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.85rem;
    color: var(--gray-700);
    max-height: 200px;
    overflow-y: auto;
}

/* ===== MODELS GRID ===== */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.model-card {
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.model-card:hover {
    border-color: var(--primary-light);
}

.model-card.selected {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.model-card h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--gray-800);
}

.model-card p {
    font-size: 0.85rem;
    color: var(--gray-600);
}

/* ===== PROJECTS GRID ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.2s ease;
}

.project-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.project-header {
    padding: var(--spacing-lg);
    background: var(--primary-gradient);
    color: var(--white);
}

.project-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.project-description {
    opacity: 0.9;
    font-size: 0.9rem;
}

.project-content {
    padding: var(--spacing-lg);
}

.project-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.project-stat {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.project-stat-number {
    font-weight: 600;
    color: var(--gray-900);
}

.project-stat-label {
    font-size: 0.8rem;
    color: var(--gray-600);
}

.project-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===== RESULTS ===== */
.results-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.results-controls select {
    min-width: 200px;
}

.results-content {
    display: grid;
    gap: var(--spacing-lg);
}

.result-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.result-header {
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.result-content {
    padding: var(--spacing-lg);
}

.experiment-result {
    margin-bottom: var(--spacing-xl);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: var(--white);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.3s ease;
}

.experiment-result:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
}

.experiment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
}

.experiment-header h4 {
    color: var(--white);
    margin: 0;
    font-size: 1.1rem;
}

.experiment-actions {
    display: flex;
    gap: var(--spacing-sm);
}

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

.experiment-info {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-lg);
    padding: 0;
}

.info-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.model-badge {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: var(--white);
}

.feature-badge {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: var(--white);
}

.sample-badge {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: var(--white);
}

.dim-badge {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: var(--white);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg);
}

.metric-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background: var(--white);
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.metric-label {
    font-size: 0.9rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* ===== PLOTS SECTION ===== */
.plots-section {
    margin: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.plots-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.plots-header h5 {
    color: var(--gray-800);
    font-size: 1.1rem;
    margin: 0;
}

.plots-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.plot-card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.3s ease;
}

.plot-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.plot-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary-gradient);
    color: var(--white);
}

.plot-header h6 {
    margin: 0;
    font-size: 1rem;
    color: var(--white);
}

.plot-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.plot-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.plot-r2 {
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.btn-plot-toggle,
.btn-plot-fullscreen {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: var(--white);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
}

.btn-plot-toggle:hover,
.btn-plot-fullscreen:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.plot-container {
    position: relative;
    width: 100%;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.plot-iframe {
    width: 100%;
    height: 500px;
    border: none;
    display: block;
    transition: opacity 0.3s ease;
}

.plot-iframe.hidden {
    display: none;
}

.plot-image {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease, opacity 0.3s ease;
    max-height: 500px;
    object-fit: contain;
}

.plot-image.hidden {
    display: none;
}

.plot-image.active:hover {
    transform: scale(1.02);
}

.plot-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--gray-500);
    font-size: 0.9rem;
}

.plot-error i {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.no-plots {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--gray-500);
    font-style: italic;
}

/* ===== MODEL DETAILS ===== */
.model-details {
    margin: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.model-details h5 {
    color: var(--gray-800);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.config-card {
    background: var(--gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.config-card h6 {
    color: var(--gray-800);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.param-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.param-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--white);
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-200);
}

.param-key {
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.param-value {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.9rem;
    background: rgba(99, 102, 241, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

/* ===== FULLSCREEN OVERLAY ===== */
.fullscreen-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fullscreen-container {
    width: 95%;
    height: 95%;
    max-width: 1400px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.fullscreen-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--primary-gradient);
    color: var(--white);
}

.fullscreen-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--white);
}

.fullscreen-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-fullscreen-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: var(--white);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    font-size: 1rem;
}

.btn-fullscreen-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.fullscreen-content {
    flex: 1;
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.fullscreen-iframe {
    width: 100%;
    height: 100%;
    border: none;
    border-radius: var(--radius-md);
}

.fullscreen-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}

/* ===== UTILITY CLASSES ===== */
.hidden {
    display: none !important;
}

.loading-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--gray-600);
}

.loading-state i {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--gray-600);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-400);
}

.empty-state h3 {
    margin-bottom: var(--spacing-md);
    color: var(--gray-700);
}

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-lg);
    z-index: 1100;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.toast.show {
    transform: translateX(0);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.toast.success .toast-icon::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--success);
}

.toast.error .toast-icon::before {
    content: '\f00d';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--error);
}

.toast.info .toast-icon::before {
    content: '\f05a';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--info);
}

/* ===== MOLECULE LIBRARY ===== */
.section-title-area {
    flex: 1;
}

.section-subtitle {
    color: var(--gray-600);
    font-size: 1rem;
    margin-top: var(--spacing-sm);
    max-width: 600px;
}

.molecule-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: var(--spacing-md);
    color: var(--gray-400);
}

.search-box input {
    padding-left: 2.5rem;
    min-width: 250px;
}

.molecule-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.molecule-filters {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.filter-group, .view-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.filter-buttons, .view-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.filter-btn, .view-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--gray-200);
    background: var(--white);
    color: var(--gray-600);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}

.filter-btn.active, .view-btn.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: var(--white);
}

.filter-btn:hover, .view-btn:hover {
    border-color: var(--primary-light);
}

.molecules-display {
    min-height: 400px;
}

.molecules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.molecule-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.molecule-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.molecule-header {
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.molecule-id {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xs);
}

.molecule-project {
    font-weight: 600;
    color: var(--primary-color);
}

.molecule-structure {
    padding: var(--spacing-lg);
    text-align: center;
    background: var(--white);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.structure-image {
    max-width: 100%;
    max-height: 180px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform 0.2s ease;
}

.structure-image:hover {
    transform: scale(1.05);
}

.molecule-info {
    padding: var(--spacing-lg);
}

.ligand-info {
    margin-bottom: var(--spacing-md);
}

.ligand-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.ligand-label {
    font-weight: 600;
    color: var(--gray-700);
    min-width: 30px;
}

.ligand-smiles {
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.8rem;
    color: var(--gray-600);
    background: var(--gray-100);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    word-break: break-all;
    flex: 1;
    margin-left: var(--spacing-sm);
}

.properties-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.property-item {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.property-value {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.9rem;
}

.property-label {
    font-size: 0.7rem;
    color: var(--gray-600);
    margin-top: var(--spacing-xs);
}

.molecule-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: space-between;
}

.btn-molecule {
    flex: 1;
    padding: var(--spacing-sm);
    font-size: 0.8rem;
}

/* ===== HELP & MODAL ===== */
.help-button {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: var(--white);
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    z-index: 1000;
}

.help-button:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: var(--spacing-lg);
    background: var(--primary-gradient);
    color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    color: var(--white);
}

.modal-close {
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background 0.2s ease;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
}

.help-tabs {
    display: flex;
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.help-tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: none;
    color: var(--gray-600);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.2s ease;
}

.help-tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: var(--white);
}

.help-content {
    padding: var(--spacing-xl);
}

.help-section {
    display: none;
}

.help-section.active {
    display: block;
}

.help-steps {
    margin-top: var(--spacing-lg);
}

.help-step {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    align-items: flex-start;
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h5 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--gray-800);
}

.step-content p {
    margin: 0;
    color: var(--gray-600);
}

/* ===== PAGINATION ===== */
.pagination-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
}

.pagination-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    background: var(--white);
    color: var(--gray-600);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.pagination-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.pagination-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .header .container {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav {
        width: 100%;
        justify-content: center;
    }
}

/* ===== MOLECULE LIBRARY STYLES ===== */

/* Section Layout */
.section-title-area {
    flex: 1;
}

.section-subtitle {
    color: var(--gray-600);
    font-size: 1rem;
    margin-top: var(--spacing-sm);
}

.molecule-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

.molecule-controls select {
    min-width: 150px;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: var(--spacing-md);
    color: var(--gray-400);
    z-index: 1;
}

.search-box input {
    padding-left: 2.5rem;
    min-width: 250px;
}

/* Statistics Cards */
.molecule-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.molecule-stat {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--white);
}

.molecule-stat .stat-icon {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.molecule-stat .stat-number {
    color: var(--white);
}

.molecule-stat .stat-label {
    color: rgba(255, 255, 255, 0.9);
}

/* Filters and View Options */
.molecule-filters {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.filter-group, .view-group, .sort-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.filter-group label, .view-group label, .sort-group label {
    font-weight: 600;
    color: var(--gray-700);
    white-space: nowrap;
}

.filter-buttons, .view-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.filter-btn, .view-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    background: var(--white);
    color: var(--gray-600);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.filter-btn:hover, .view-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-btn.active, .view-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* Sort Controls */
.sort-controls {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.sort-controls select {
    min-width: 140px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    background: var(--white);
    color: var(--gray-700);
    font-size: 0.9rem;
}

.sort-order-btn {
    padding: var(--spacing-sm);
    border: 1px solid var(--gray-300);
    background: var(--white);
    color: var(--gray-600);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}

.sort-order-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.sort-order-btn.desc {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* Molecule Display Area */
.molecules-display {
    min-height: 400px;
    margin-bottom: var(--spacing-xl);
}

/* Grid View */
.molecules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.molecule-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.molecule-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.molecule-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--white);
}

.molecule-id {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.molecule-project {
    font-size: 0.9rem;
    opacity: 0.9;
}

.molecule-structures {
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.ligand-structure {
    text-align: center;
    flex: 1;
    min-width: 100px;
}

.ligand-label {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.ligand-image {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-xs);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    cursor: pointer;
    transition: all 0.2s ease;
}

.ligand-image:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.ligand-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.ligand-smiles {
    font-size: 0.75rem;
    color: var(--gray-500);
    word-break: break-all;
    line-height: 1.2;
}

.molecule-properties {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.property-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
}

.property-item {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.property-label {
    display: block;
    font-size: 0.8rem;
    color: var(--gray-600);
    font-weight: 500;
}

.property-value {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-top: var(--spacing-xs);
}

.no-properties {
    text-align: center;
    color: var(--gray-500);
    font-style: italic;
    padding: var(--spacing-md);
}

.molecule-reference {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
}

.molecule-reference a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.molecule-reference a:hover {
    text-decoration: underline;
}

/* Table View */
.molecules-table-container {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.molecules-table {
    width: 100%;
    border-collapse: collapse;
}

.molecules-table th {
    background: var(--primary-gradient);
    color: var(--white);
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
}

.molecules-table th.sortable {
    cursor: pointer;
    user-select: none;
    transition: all 0.2s ease;
    position: relative;
}

.molecules-table th.sortable:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
}

.molecules-table th.sortable i {
    margin-left: var(--spacing-xs);
    font-size: 0.8rem;
    opacity: 0.7;
}

.molecules-table th.sortable:hover i {
    opacity: 1;
}

.molecules-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
    vertical-align: middle;
}

.molecules-table tr:hover {
    background: var(--gray-50);
}

.smiles-cell {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: var(--gray-600);
    max-width: 150px;
}

/* 3D Gallery View */
.molecules-3d-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

.molecule-3d-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.molecule-3d-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.molecule-3d-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: var(--white);
    text-align: center;
}

.molecule-3d-header h4 {
    margin: 0 0 var(--spacing-xs) 0;
    font-size: 1.2rem;
}

.molecule-3d-project {
    font-size: 0.9rem;
    opacity: 0.9;
}

.molecule-3d-viewer {
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.structure-3d {
    text-align: center;
}

.structure-3d-label {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.structure-3d-image {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid var(--gray-200);
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 0 auto;
}

.structure-3d-image:hover {
    border-color: var(--primary-color);
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.structure-3d-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.no-structures {
    text-align: center;
    color: var(--gray-500);
    font-style: italic;
    padding: var(--spacing-xl);
}

.molecule-3d-properties {
    padding: 0 var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.property-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--white);
}

.wavelength-badge {
    background: linear-gradient(135deg, #ff6b6b, #ff8787);
}

.plqy-badge {
    background: linear-gradient(135deg, #4ecdc4, #44a08d);
}

.tau-badge {
    background: linear-gradient(135deg, #45b7d1, #96c7ed);
}

.no-properties-badge {
    background: var(--gray-400);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
}

.molecule-3d-actions {
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    border-top: 1px solid var(--gray-200);
}

/* Modals */
.molecule-modal .modal-content,
.structure-modal .modal-content {
    max-width: 900px;
    max-height: 90vh;
    overflow-y: auto;
}

.molecule-details {
    padding: var(--spacing-lg);
}

.molecule-details-header h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.molecule-details-content {
    margin-bottom: var(--spacing-xl);
}

.details-section {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-md);
}

.details-section h5 {
    color: var(--gray-800);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.details-section p {
    color: var(--gray-600);
    margin: 0;
}

.molecule-details-actions {
    text-align: center;
}

/* Structure Viewer */
.structure-viewer {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    padding: var(--spacing-lg);
}

.structure-image-large {
    text-align: center;
}

.structure-image-large img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.structure-error {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--gray-500);
    background: var(--gray-50);
    border-radius: var(--radius-md);
}

.structure-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.info-section h5 {
    color: var(--gray-800);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.smiles-display {
    padding: var(--spacing-md);
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    word-break: break-all;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.properties-loading {
    text-align: center;
    color: var(--gray-500);
    padding: var(--spacing-lg);
}

.properties-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.properties-grid .property-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
}

.properties-grid .property-label {
    font-weight: 500;
    color: var(--gray-700);
}

.properties-grid .property-value {
    font-weight: 600;
    color: var(--gray-900);
    font-family: 'Courier New', monospace;
}

.properties-error {
    text-align: center;
    color: var(--error);
    padding: var(--spacing-lg);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.pagination-ellipsis {
    padding: var(--spacing-sm);
    color: var(--gray-400);
}

.pagination-info {
    text-align: center;
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* Error and Empty States */
.error-state, .empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--gray-500);
}

.error-state i, .empty-state i {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-400);
}

.error-state h3, .empty-state h3 {
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
}

/* Loading States */
.loading-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--gray-500);
}

.loading-state i {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

/* Responsive Design for Molecule Library */
@media (max-width: 768px) {
    .molecule-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-box input {
        min-width: auto;
        width: 100%;
    }
    
    .molecule-filters {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }
    
    .filter-group, .view-group, .sort-group {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-sm);
    }
    
    .sort-controls {
        justify-content: space-between;
    }
    
    .sort-controls select {
        flex: 1;
        min-width: auto;
    }
    
    .molecules-grid {
        grid-template-columns: 1fr;
    }
    
    .molecules-3d-gallery {
        grid-template-columns: 1fr;
    }
    
    .structure-viewer {
        grid-template-columns: 1fr;
    }
    
    .molecules-table-container {
        overflow-x: auto;
    }
    
    .molecules-table {
        min-width: 800px;
    }
    
    .nav-btn {
        flex: 1;
        justify-content: center;
    }
    
    .section-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .results-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ===== PREDICTION SECTION ===== */
.prediction-section {
    margin-bottom: var(--spacing-2xl);
}

.prediction-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.ligand-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.input-group {
    position: relative;
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--gray-700);
}

.input-group input[type="text"] {
    width: 100%;
    padding: var(--spacing-sm);
    padding-right: 45px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: all 0.2s ease;
    font-family: 'Courier New', monospace;
    background: var(--white);
}

.input-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.structure-preview-btn {
    position: absolute;
    right: 8px;
    top: 32px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.structure-preview-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.prediction-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.option-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--gray-700);
}

.option-group select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--white);
    transition: all 0.2s ease;
}

.option-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    cursor: pointer;
}

.checkbox-item:hover {
    background: var(--gray-50);
}

.checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.checkbox-item span {
    font-weight: 500;
    color: var(--gray-700);
}

.prediction-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    margin-top: var(--spacing-lg);
}

.prediction-results {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.prediction-results h4 {
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--gray-800);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.prediction-results h4::before {
    content: '✨';
    font-size: 1.2em;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.result-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all 0.2s ease;
}

.result-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.result-property {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.result-confidence {
    font-size: 0.8rem;
    color: var(--gray-500);
}

.prediction-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
}

.prediction-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-2xl);
    color: var(--gray-600);
}

.prediction-loading i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===== PROPERTIES ERROR STYLING ===== */
.properties-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    color: #dc2626;
}

.properties-error i {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: #ef4444;
}

.properties-error .error-title {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.properties-error .error-message {
    margin-bottom: var(--spacing-sm);
    color: #b91c1c;
}

.properties-error .error-help {
    color: #6b7280;
    font-style: italic;
}

.properties-error .error-help small {
    font-size: 0.85rem;
}

.structure-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    background: #f9fafb;
    border: 2px dashed #d1d5db;
    border-radius: var(--radius-md);
    color: #6b7280;
    min-height: 200px;
}

.structure-error i {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: #9ca3af;
}

/* ===== FINGERPRINT PARAMETERS ===== */
.fingerprint-params {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    position: relative;
}

.fingerprint-params::before {
    content: "Morgan Fingerprint Settings";
    position: absolute;
    top: -12px;
    left: var(--spacing-lg);
    background: var(--white);
    padding: 0 var(--spacing-sm);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
}

.fingerprint-params.hidden {
    display: none;
}

/* Show fingerprint params only for morgan and combined features */
.feature-type-morgan .fingerprint-params,
.feature-type-combined .fingerprint-params {
    display: flex;
}

.feature-type-descriptors .fingerprint-params {
    display: none;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .ligand-inputs {
        grid-template-columns: 1fr;
    }
    
    .prediction-options {
        grid-template-columns: 1fr;
    }
    
    .prediction-actions {
        flex-direction: column;
    }
    
    .fingerprint-params {
        flex-direction: column;
    }
}