/* ===================================
   Exoplanet Discovery Hub - Stylesheet
   Modern, Responsive, User-Friendly Design
   =================================== */

/* ========== ROOT VARIABLES ========== */
:root {
    /* Colors - Purple, Blue, Pink, Black Theme */
    --primary-color: #a855f7;        /* Purple */
    --primary-dark: #7c3aed;
    --primary-light: #c084fc;
    --secondary-color: #3b82f6;      /* Blue */
    --accent-color: #ec4899;         /* Pink */
    --neon-glow: #f0abfc;            /* Light purple neon */
    --success-color: #10b981;
    --warning-color: #ec4899;
    --danger-color: #ec4899;
    --info-color: #3b82f6;
    
    /* Backgrounds - Black/Dark */
    --bg-primary: #000000;           /* Pure black */
    --bg-secondary: #1a1a1a;         /* Dark gray */
    --bg-card: #1a1a1a;
    --bg-hover: #2a2a2a;
    
    /* Text */
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-muted: #999999;
    
    /* Borders */
    --border-color: #333333;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(168, 85, 247, 0.2);
    --shadow-md: 0 4px 6px rgba(168, 85, 247, 0.3);
    --shadow-lg: 0 10px 20px rgba(168, 85, 247, 0.4);
    --shadow-xl: 0 20px 40px rgba(168, 85, 247, 0.5);
    --shadow-neon: 0 0 20px rgba(240, 171, 252, 0.4);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* ========== GLOBAL STYLES ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Ubuntu', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #000000 0%, #0a0015 25%, #000820 50%, #0a0015 75%, #000000 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Special Gothic Expanded One', 'Impact', sans-serif;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.main-content {
    padding: var(--spacing-lg) 0;
    min-height: calc(100vh - 200px);
}

/* ========== HEADER ========== */
.header {
    background: transparent;
    padding: var(--spacing-lg) 0;
    position: relative;
    overflow: hidden;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.logo i {
    font-size: 2.5rem;
    animation: float 3s ease-in-out infinite;
}

.logo h1 {
    font-family: 'Special Gothic Expanded One', 'Impact', sans-serif;
    font-size: 2.5rem;
    font-weight: 400;
    text-shadow: 0 0 15px rgba(240, 171, 252, 0.3),
                 0 0 30px rgba(168, 85, 247, 0.2),
                 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.tagline {
    margin-top: var(--spacing-sm);
    font-size: 1.1rem;
    opacity: 0.95;
    position: relative;
    z-index: 1;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ========== CARDS ========== */
.card {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(168, 85, 247, 0.03) 100%);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(168, 85, 247, 0.2);
    border-color: rgba(168, 85, 247, 0.4);
}

.card-header {
    background: transparent;
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-bottom: 1px solid rgba(168, 85, 247, 0.3);
}

.card-header i {
    font-size: 1.5rem;
}

.card-header h2 {
    font-family: 'Special Gothic Expanded One', 'Impact', sans-serif;
    font-size: 1.5rem;
    font-weight: 400;
    flex: 1;
}

.card-body {
    padding: var(--spacing-lg);
}

.welcome-card {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(168, 85, 247, 0.1) 50%, rgba(59, 130, 246, 0.05) 100%);
    border: 2px solid var(--primary-color);
    box-shadow: 0 0 30px rgba(168, 85, 247, 0.15);
}

/* ========== TABS ========== */
.tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.tab-button {
    flex: 1;
    min-width: 150px;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-family: 'Ubuntu', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.tab-button:hover {
    background: var(--bg-hover);
    transform: translateY(-2px);
}

.tab-button.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md), 0 0 15px rgba(168, 85, 247, 0.4);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== INFO BOXES ========== */
.info-boxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.info-box {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(59, 130, 246, 0.05));
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition);
}

.info-box:hover {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(59, 130, 246, 0.1));
    box-shadow: 0 0 20px rgba(240, 171, 252, 0.3);
    transform: translateY(-3px);
}

.info-box i {
    font-size: 2.5rem;
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
}

.info-box h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-light);
}

/* ========== DATASET OPTIONS ========== */
.dataset-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.checkbox-card {
    position: relative;
    cursor: pointer;
}

.checkbox-card input[type="checkbox"] {
    position: absolute;
    opacity: 0;
}

.checkbox-content {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition);
}

.checkbox-card:hover .checkbox-content {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.checkbox-card input[type="checkbox"]:checked + .checkbox-content {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.checkbox-content i {
    font-size: 2rem;
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
}

.checkbox-content h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
}

.badge {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-top: var(--spacing-xs);
}

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

.model-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.model-card:hover {
    border-color: var(--primary-color);
    transform: scale(1.02);
}

.model-card.selected {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.2) 0%, rgba(236, 72, 153, 0.15) 100%);
    border-color: var(--primary-color);
    box-shadow: 0 0 25px rgba(168, 85, 247, 0.4), 0 0 10px rgba(240, 171, 252, 0.2);
}

.model-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-light);
}

.model-stats {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.stat-badge {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(59, 130, 246, 0.1));
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
    border: 1px solid var(--primary-color);
}

/* ========== BUTTONS ========== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(168, 85, 247, 0.5);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.2rem;
}

.action-buttons {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-lg);
}

/* ========== PROGRESS ========== */
.progress-content {
    text-align: center;
    padding: var(--spacing-xl);
}

.spinner {
    width: 60px;
    height: 60px;
    border: 6px solid rgba(168, 85, 247, 0.2);
    border-top-color: var(--neon-glow);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
    box-shadow: 0 0 15px rgba(240, 171, 252, 0.3);
}

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

.progress-bar {
    width: 100%;
    height: 30px;
    background: var(--bg-secondary);
    border-radius: 15px;
    overflow: hidden;
    margin-top: var(--spacing-md);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    transition: width 0.3s ease;
    width: 0;
    animation: progress 2s ease-in-out infinite;
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.5);
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 90%; }
}

/* ========== ALERTS ========== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-left: 4px solid;
}

.alert i {
    font-size: 1.5rem;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--warning-color);
    color: var(--text-primary);
}

.alert-info {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(59, 130, 246, 0.1));
    border-color: var(--info-color);
    color: var(--text-primary);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success-color);
    color: var(--text-primary);
}

/* ========== METRICS GRID ========== */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.metric-card {
    background: linear-gradient(135deg, var(--bg-secondary), rgba(168, 85, 247, 0.05));
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition);
}

.metric-card:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(240, 171, 252, 0.3);
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-light);
    margin: var(--spacing-sm) 0;
}

.metric-label {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.metric-description {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* ========== VISUALIZATIONS ========== */
.visualizations {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

.viz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-md);
}

.viz-card {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.05) 0%, rgba(59, 130, 246, 0.05) 100%);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.viz-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 4px 20px rgba(168, 85, 247, 0.3);
}

.viz-title {
    font-family: 'Special Gothic Expanded One', 'Impact', sans-serif;
    color: var(--primary-light);
    font-size: 1.3rem;
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.viz-title i {
    color: var(--accent-color);
}

.viz-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.viz-image-container {
    background: white;
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm);
    overflow: hidden;
}

.viz-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius-sm);
}

.viz-container {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.viz-container img {
    width: 100%;
    border-radius: var(--border-radius-sm);
}

.viz-container h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--primary-light);
}

/* ========== UPLOAD AREA ========== */
.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

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

.upload-area i {
    font-size: 3rem;
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
}

/* ========== LEARN SECTION ========== */
.learn-section {
    display: grid;
    gap: var(--spacing-lg);
}

.learn-item {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.learn-item h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
    font-size: 1.3rem;
}

.learn-item p {
    margin-bottom: var(--spacing-xs);
}

.learn-item strong {
    color: var(--text-primary);
}

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

.instruction {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
}

.help-icon {
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
}

.help-icon:hover {
    color: var(--primary-light);
    transform: scale(1.1);
}

/* ========== MODAL ========== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.close-modal {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--danger-color);
}

/* ========== FOOTER ========== */
.footer {
    background: linear-gradient(180deg, transparent, rgba(168, 85, 247, 0.05));
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-top: var(--spacing-xl);
    border-top: 2px solid var(--border-color);
}

.footer p {
    color: var(--text-secondary);
    margin: var(--spacing-xs) 0;
}

/* ========== LOADING OVERLAY ========== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.95), rgba(10, 0, 21, 0.95));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner-large {
    width: 100px;
    height: 100px;
    border: 8px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* ========== MODEL SELECTION STYLES ========== */
.model-filters {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.filter-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.filter-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.filter-group select {
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.filter-group select:hover {
    border-color: var(--primary-color);
}

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

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

.model-card {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #2a3447 100%);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.model-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.model-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.model-card:hover::before {
    transform: scaleX(1);
}

.model-card.selected {
    border-color: var(--success-color);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.model-card.selected::before {
    background: var(--success-color);
    transform: scaleX(1);
}

.model-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.model-card-icon {
    font-size: 2rem;
    color: var(--primary-color);
}

.model-card.selected .model-card-icon {
    color: var(--success-color);
}

.model-card-title {
    font-family: 'Special Gothic Expanded One', 'Impact', sans-serif;
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--text-primary);
}

.model-card-dataset {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.model-card-dataset.kepler {
    background: linear-gradient(135deg, #a855f7 0%, #7c3aed 100%);
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.3);
}

.model-card-dataset.k2 {
    background: linear-gradient(135deg, #ec4899 0%, #be185d 100%);
    box-shadow: 0 0 10px rgba(236, 72, 153, 0.3);
}

.model-card-dataset.tess {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
}

.model-card-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.model-metric {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
}

.model-metric-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.model-metric-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--success-color);
}

/* Custom Model Badge */
.custom-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

.model-card.custom-model {
    border: 2px solid #f59e0b;
}

/* Model Card Actions */
.model-card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: var(--spacing-sm);
}

.model-card-select-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.model-card-delete-btn {
    padding: var(--spacing-sm);
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.model-card-delete-btn:hover {
    background: linear-gradient(135deg, #b91c1c, #991b1b);
    transform: scale(1.05);
}

.model-card-select-btn:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.model-card.selected .model-card-select-btn {
    background: linear-gradient(135deg, var(--success-color), #059669);
}

.model-card.selected .model-card-select-btn::before {
    content: '✓ ';
}

.selected-model-details {
    text-align: center;
}

.selected-model-details h3 {
    font-size: 1.5rem;
    color: var(--success-color);
    margin-bottom: var(--spacing-md);
}

.model-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.stat-box {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.stat-box:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.stat-box i {
    font-size: 1.5rem;
    color: var(--primary-color);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.stat-value {
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.success-message {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.success-message i {
    font-size: 1.2rem;
}

.loading-indicator {
    text-align: center;
    padding: var(--spacing-xl);
}

.loading-indicator .spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto var(--spacing-md);
}

.loading-indicator p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab-button {
        width: 100%;
    }
    
    .info-boxes,
    .dataset-options,
    .model-options,
    .metrics-grid,
    .visualizations,
    .models-grid {
        grid-template-columns: 1fr;
    }
    
    .model-filters {
        flex-direction: column;
    }
    
    .model-card-metrics {
        grid-template-columns: 1fr;
    }
    
    .model-stats {
        grid-template-columns: 1fr;
    }
}

/* ========== PREDICTION FORM STYLES ========== */
.prediction-inputs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

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

.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.form-input {
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.4);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:hover {
    border-color: var(--primary-color);
    background: rgba(168, 85, 247, 0.05);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.2), 0 0 15px rgba(240, 171, 252, 0.2);
    background: rgba(168, 85, 247, 0.08);
}

.form-input::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

#predict-single-button,
#predict-batch-button {
    margin-top: var(--spacing-md);
}

/* ========== PREDICTION RESULTS STYLES ========== */
.prediction-result {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.result-main {
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(236, 72, 153, 0.08));
    border: 2px solid var(--primary-color);
    box-shadow: 0 0 30px rgba(168, 85, 247, 0.2);
}

.result-main h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 20px rgba(240, 171, 252, 0.3);
}

.result-main p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.probability-breakdown {
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.8), rgba(168, 85, 247, 0.05));
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(168, 85, 247, 0.1);
}

.probability-breakdown h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.probability-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.prob-item {
    display: grid;
    grid-template-columns: 150px 1fr 80px;
    align-items: center;
    gap: var(--spacing-sm);
}

.prob-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.prob-bar-container {
    background: var(--bg-primary);
    border-radius: 10px;
    height: 20px;
    overflow: hidden;
    position: relative;
}

.prob-bar {
    height: 100%;
    border-radius: 10px;
    transition: width 0.5s ease;
    position: relative;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.4);
}

.prob-value {
    font-weight: 700;
    color: var(--text-primary);
    text-align: right;
}

/* ========================================
   CUSTOM TRAINING INTERFACE
   ======================================== */

.training-section {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md);
    background: rgba(168, 85, 247, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid rgba(168, 85, 247, 0.2);
}

.training-section h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
}

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

.radio-card {
    display: block;
    cursor: pointer;
}

.radio-card input[type="radio"] {
    display: none;
}

.radio-content {
    padding: var(--spacing-lg);
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(168, 85, 247, 0.3);
    border-radius: var(--border-radius);
    text-align: center;
    transition: all 0.3s ease;
}

.radio-content i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.radio-content h4 {
    margin: var(--spacing-sm) 0;
    color: var(--text-primary);
}

.radio-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.radio-card input[type="radio"]:checked + .radio-content {
    background: rgba(168, 85, 247, 0.2);
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(168, 85, 247, 0.4);
    transform: translateY(-2px);
}

.param-select {
    width: 100%;
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
}

.param-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.3);
}

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

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

.param-row label {
    color: var(--text-primary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.param-info {
    cursor: help;
    color: var(--secondary-color);
    font-size: 1.2rem;
}

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

.param-control input[type="range"] {
    flex: 1;
    height: 8px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 5px;
    outline: none;
    -webkit-appearance: none;
}

.param-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.5);
}

.param-control input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.5);
    border: none;
}

.param-number {
    width: 80px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    text-align: center;
    font-size: 1rem;
}

.param-number:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.2rem;
    width: 100%;
    max-width: 400px;
    margin: var(--spacing-md) auto;
    display: block;
}

.training-note {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: var(--spacing-sm);
}

.training-progress {
    padding: var(--spacing-lg);
    background: rgba(168, 85, 247, 0.1);
    border-radius: var(--border-radius);
    border: 2px solid var(--primary-color);
    margin-top: var(--spacing-lg);
}

.progress-header h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.progress-header p {
    color: var(--text-secondary);
    font-style: italic;
}

.progress-bar-container {
    width: 100%;
    height: 30px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 15px;
    overflow: hidden;
    margin: var(--spacing-md) 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    width: 0%;
    transition: width 0.5s ease;
    border-radius: 15px;
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.6);
}

.progress-time {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.training-results {
    padding: var(--spacing-lg);
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--border-radius);
    border: 2px solid var(--success-color);
    margin-top: var(--spacing-lg);
}

.training-results h3 {
    color: var(--success-color);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.results-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.result-card {
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(168, 85, 247, 0.3);
    border-radius: var(--border-radius);
}

.result-card-highlight {
    border-color: var(--accent-color);
    background: rgba(236, 72, 153, 0.1);
    box-shadow: 0 0 20px rgba(236, 72, 153, 0.3);
}

.result-card h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

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

.metrics-display .metric-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs);
    background: rgba(168, 85, 247, 0.05);
    border-radius: 5px;
}

.metrics-display .metric-label {
    color: var(--text-secondary);
}

.metrics-display .metric-value {
    color: var(--primary-color);
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}