/* ============================================
   AI DATA SCIENTIST - MASTER CSS
   Animated Neurons | Glassmorphism | Liquid Effects
   Theme: Deep Space Purple with Cyan Accents
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
    --primary: #667eea;
    --primary-light: #8b5cf6;
    --secondary: #06b6d4;
    --accent: #f59e0b;
    --danger: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --info: #3b82f6;

    --bg-deep: #0a0e27;
    --bg-mid: #131842;
    --bg-light: #1a1f4e;
    --bg-card: rgba(255, 255, 255, 0.03);

    --text-primary: #e0e0ff;
    --text-secondary: #a0a0c0;
    --text-muted: #6b6b8a;

    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-bg-hover: rgba(255, 255, 255, 0.06);

    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.15);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);

    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    --gradient-dark: linear-gradient(180deg, #0a0e27 0%, #131842 100%);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ============================================
   ANIMATED NEURONS BACKGROUND
   ============================================ */
.neurons-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ============================================
   GLASSMORPHISM UTILITIES
   ============================================ */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
}

.glass-strong {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-lg);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.03), transparent);
    transition: left 0.6s ease;
}

.glass-card:hover::before {
    left: 100%;
}

.glass-card:hover {
    background: var(--glass-bg-hover);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow), var(--shadow-card);
}

/* ============================================
   LIQUID / WATER GLASSY BUTTONS
   ============================================ */
.btn-liquid {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    color: white;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
    text-decoration: none;
}

.btn-liquid::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}

.btn-liquid:hover::before {
    left: 100%;
}

.btn-liquid:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.6);
}

.btn-liquid:active {
    transform: translateY(0) scale(0.98);
}

.btn-liquid-secondary {
    background: var(--gradient-secondary);
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.4);
}

.btn-liquid-secondary:hover {
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.6);
}

.btn-liquid-accent {
    background: var(--gradient-accent);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.4);
}

.btn-liquid-accent:hover {
    box-shadow: 0 8px 30px rgba(245, 158, 11, 0.6);
}

.btn-liquid-outline {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: none;
}

.btn-liquid-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.1);
}

.btn-liquid-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 4px 20px rgba(239, 68, 68, 0.4);
}

.btn-liquid-danger:hover {
    box-shadow: 0 8px 30px rgba(239, 68, 68, 0.6);
}

/* ============================================
   NAVIGATION BAR
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 0 24px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(10, 14, 39, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.nav-brand-icon {
    font-size: 1.8rem;
    animation: pulse-glow 3s ease-in-out infinite;
}

.nav-brand-text {
    font-size: 1.3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-brand-sub {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.nav-link i {
    font-size: 1.1rem;
}

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
}

/* Mobile Navigation */
@media (max-width: 1024px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(10, 14, 39, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 8px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.4s ease;
        border-bottom: 1px solid var(--glass-border);
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-link {
        width: 100%;
        padding: 14px 20px;
        font-size: 1rem;
    }

    .nav-mobile-toggle {
        display: block;
    }

    .navbar {
        padding: 0 16px;
    }
}

/* ============================================
   MAIN CONTENT AREA
   ============================================ */
.main-content {
    position: relative;
    z-index: 1;
    padding-top: 90px;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 24px;
    position: relative;
}

.hero-content {
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--primary);
    margin-bottom: 32px;
    animation: fade-in-up 0.8s ease;
}

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

.hero-title {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    animation: fade-in-up 0.8s ease 0.1s both;
}

.hero-title .gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    animation: fade-in-up 0.8s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fade-in-up 0.8s ease 0.3s both;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-top: 60px;
    animation: fade-in-up 0.8s ease 0.4s both;
}

.hero-stat-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
}

.hero-stat-card:hover {
    background: var(--glass-bg-hover);
    transform: translateY(-4px);
}

.hero-stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 8px;
}

/* ============================================
   FEATURE CARDS
   ============================================ */
.features-section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.section-subtitle {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.feature-card:hover::after {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    background: var(--glass-bg-hover);
    box-shadow: var(--shadow-glow), var(--shadow-card);
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.feature-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================
   UPLOAD SECTION
   ============================================ */

/* Upload Zone Styles */
/* Upload zone */
.upload-zone {
    border: 2px dashed rgba(102, 126, 234, 0.4);
    border-radius: 16px;
    transition: all 0.3s ease;
    cursor: pointer;
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

/* Tab system */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Chart containers */
.plotly-chart {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}
[id^="chart-"] {
    min-height: 300px;
}

/* Loading spinner */
@keyframes spin {
    to { transform: rotate(360deg); }
}
.upload-zone {
    border: 2px dashed rgba(102, 126, 234, 0.4);
    border-radius: 16px;
    transition: all 0.3s ease;
    cursor: pointer;
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

.plotly-chart {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}
[id^="chart-"] {
    min-height: 300px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
.upload-zone {
    border: 2px dashed rgba(102, 126, 234, 0.4);
    border-radius: 16px;
    transition: all 0.3s ease;
    position: relative;
}

.upload-zone:hover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.05);
    transform: translateY(-2px);
}

.upload-zone.dragover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.01);
}

.upload-progress.active {
    display: block !important;
}

/* Tab content visibility fix */
.tab-content {
    display: none;
}

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

/* Plotly chart containers */
.plotly-chart {
    background: var(--glass-bg, rgba(255,255,255,0.03));
    border: 1px solid var(--glass-border, rgba(255,255,255,0.1));
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

/* Ensure chart divs have proper sizing */
[id^="chart-"] {
    min-height: 300px;
}

.upload-zone {
    border: 2px dashed rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-xl);
    padding: 60px 40px;
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    transition: all 0.4s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.6s ease;
}

.upload-zone:hover::before {
    width: 400px;
    height: 400px;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
    transform: scale(1.01);
}

.upload-zone.dragover {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.05);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    animation: float 3s ease-in-out infinite;
}

.upload-text {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.upload-hint {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.upload-progress {
    margin-top: 24px;
    display: none;
}

.upload-progress.active {
    display: block;
}

.progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
    transition: width 0.3s ease;
    animation: shimmer 1.5s ease-in-out infinite;
    background-size: 200% 100%;
}

/* ============================================
   DATA TABLE STYLING
   ============================================ */
.data-table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table thead {
    background: rgba(102, 126, 234, 0.1);
}

.data-table th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--glass-border);
    white-space: nowrap;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

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

/* ============================================
   METRIC CARDS
   ============================================ */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.metric-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.metric-card:hover {
    transform: translateY(-4px);
    background: var(--glass-bg-hover);
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0.5;
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.metric-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 12px;
}

.metric-change {
    font-size: 0.8rem;
    margin-top: 4px;
}

.metric-change.positive { color: var(--success); }
.metric-change.negative { color: var(--danger); }

/* ============================================
   INSIGHT CARDS
   ============================================ */
.insight-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 16px;
    transition: all 0.3s ease;
    border-left: 4px solid var(--primary);
}

.insight-card:hover {
    background: var(--glass-bg-hover);
    transform: translateX(4px);
}

.insight-card.success { border-left-color: var(--success); }
.insight-card.warning { border-left-color: var(--warning); }
.insight-card.danger { border-left-color: var(--danger); }
.insight-card.info { border-left-color: var(--info); }

.insight-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

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

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

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

.insight-badge.info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--info);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.insight-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.insight-content {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================
   FORM ELEMENTS
   ============================================ */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.form-select option {
    background: var(--bg-mid);
    color: var(--text-primary);
}

/* ============================================
   TABS
   ============================================ */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 1px;
    overflow-x: auto;
    scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    white-space: nowrap;
    position: relative;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
    color: var(--primary);
    background: rgba(102, 126, 234, 0.1);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px 2px 0 0;
}

.tab-content {
    display: none;
    animation: fade-in 0.3s ease;
}

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

/* ============================================
   LOADING & SPINNER
   ============================================ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 39, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.loading-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-text {
    margin-top: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   ALERTS / TOASTS
   ============================================ */
.alert {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slide-in-right 0.4s ease;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--success);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: var(--warning);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--info);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: rgba(10, 14, 39, 0.9);
    border-top: 1px solid var(--glass-border);
    padding: 40px 24px 24px;
    margin-top: 80px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-brand-text {
    font-size: 1.2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.6;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-bottom {
    max-width: 1400px;
    margin: 40px auto 0;
    padding-top: 24px;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-bottom a {
    color: var(--primary);
    text-decoration: none;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slide-in-right {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes pulse-glow {
    0%, 100% { 
        filter: drop-shadow(0 0 5px rgba(102, 126, 234, 0.5));
    }
    50% { 
        filter: drop-shadow(0 0 20px rgba(102, 126, 234, 0.8));
    }
}

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

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

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes glow-pulse {
    0%, 100% { box-shadow: 0 0 20px rgba(102, 126, 234, 0.2); }
    50% { box-shadow: 0 0 40px rgba(102, 126, 234, 0.5); }
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .main-content {
        padding-top: 80px;
    }

    .hero {
        min-height: auto;
        padding: 60px 16px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .btn-liquid {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .upload-zone {
        padding: 40px 20px;
    }

    .data-table-container {
        font-size: 0.75rem;
    }

    .data-table th,
    .data-table td {
        padding: 8px 10px;
    }

    .tabs {
        gap: 2px;
    }

    .tab-btn {
        padding: 10px 16px;
        font-size: 0.8rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .metrics-grid {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn-liquid {
        width: 100%;
        justify-content: center;
    }
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   CODE BLOCKS
   ============================================ */
pre, code {
    font-family: 'JetBrains Mono', monospace;
}

pre {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 20px;
    overflow-x: auto;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

code {
    background: rgba(102, 126, 234, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--primary-light);
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-primary {
    background: rgba(102, 126, 234, 0.15);
    color: var(--primary);
    border: 1px solid rgba(102, 126, 234, 0.3);
}

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

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

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

/* ============================================
   DIVIDER
   ============================================ */
.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
    margin: 32px 0;
}

/* ============================================
   PLOTLY CHART CONTAINER
   ============================================ */
.plotly-chart {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 24px;
}

/* ============================================
   DASHBOARD SPECIFIC
   ============================================ */
.dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 16px;
}

.dashboard-title {
    font-size: 2rem;
    font-weight: 800;
}

.dataset-info-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.dataset-info-bar .dataset-name {
    color: var(--text-primary);
    font-weight: 600;
}

/* ============================================
   OPERATION PANEL
   ============================================ */
.operation-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.operation-panel-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--glass-border);
}

.operation-panel-title {
    font-size: 1.1rem;
    font-weight: 700;
}

.operation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.operation-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.operation-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary);
}

.operation-card-icon {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.operation-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.operation-card-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   MODEL LEADERBOARD
   ============================================ */
.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
}

.leaderboard-table th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--glass-border);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.leaderboard-table td {
    padding: 14px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
}

.leaderboard-table tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.leaderboard-table .rank-1 {
    color: #ffd700;
    font-weight: 700;
}

.leaderboard-table .rank-2 {
    color: #c0c0c0;
    font-weight: 700;
}

.leaderboard-table .rank-3 {
    color: #cd7f32;
    font-weight: 700;
}

/* ============================================
   REPORT CARDS
   ============================================ */
.report-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 16px;
    transition: all 0.3s ease;
}

.report-card:hover {
    background: var(--glass-bg-hover);
}

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

.report-card-title {
    font-size: 1rem;
    font-weight: 700;
}

.report-card-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   EXPLORE TABS
   ============================================ */
.explore-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.explore-tab {
    padding: 10px 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.explore-tab.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
}

/* ============================================
   NO DATA STATE
   ============================================ */
.no-data {
    text-align: center;
    padding: 80px 24px;
}

.no-data-icon {
    font-size: 4rem;
    margin-bottom: 24px;
    opacity: 0.5;
}

.no-data-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.no-data-desc {
    color: var(--text-muted);
    margin-bottom: 24px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   GITHUB BRANDING
   ============================================ */
.github-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.github-badge:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.github-badge svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}