:root {
    /* Color Palette - Rich & Premium */
    --primary-purple: #8b5cf6;
    --primary-purple-dark: #7c3aed;
    --primary-purple-light: #a78bfa;
    --accent-cyan: #06b6d4;
    --accent-pink: #ec4899;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-amber: #f59e0b;
    
    /* Dark Theme Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #13131a;
    --bg-tertiary: #1a1a24;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: rgba(0, 0, 0, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

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

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

/* Animated Background Gradient */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, 
        var(--bg-primary) 0%, 
        #1a0f2e 25%, 
        #0f1a2e 50%, 
        #1a0f2e 75%, 
        var(--bg-primary) 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* Glass Card Effect */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px var(--glass-shadow);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    border-color: rgba(139, 92, 246, 0.3);
    box-shadow: 0 12px 48px rgba(139, 92, 246, 0.15);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-purple), var(--accent-cyan));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    animation: pulse 2s ease-in-out infinite;
}

.logo-icon svg {
    width: 28px;
    height: 28px;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-purple-light), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-top: var(--spacing-xs);
}

/* Input Section */
.input-section {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.input-wrapper {
    margin-bottom: var(--spacing-md);
}

.input-wrapper label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    resize: vertical;
    transition: all var(--transition-normal);
}

textarea:focus {
    outline: none;
    border-color: var(--primary-purple);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

textarea::placeholder {
    color: var(--text-muted);
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary.loading {
    pointer-events: none;
    opacity: 0.8;
}

.btn-primary.loading .btn-text {
    opacity: 0;
}

.btn-primary.loading .btn-loader {
    display: block;
}

.btn-loader {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary-purple);
}

/* Results Section */
.results-section {
    animation: fadeInUp var(--transition-slow);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Verdict Card */
.verdict-card {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.verdict-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.verdict-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
    animation: scaleIn var(--transition-normal);
}

@keyframes scaleIn {
    from { transform: scale(0); }
    to { transform: scale(1); }
}

.verdict-icon.real {
    background: linear-gradient(135deg, var(--accent-green), #059669);
}

.verdict-icon.fake {
    background: linear-gradient(135deg, var(--accent-red), #dc2626);
}

.verdict-icon.unverified {
    background: linear-gradient(135deg, var(--accent-amber), #d97706);
}

.verdict-content {
    flex: 1;
}

#verdictTitle {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

#verdictTitle.real {
    color: var(--accent-green);
}

#verdictTitle.fake {
    color: var(--accent-red);
}

#verdictTitle.unverified {
    color: var(--accent-amber);
}

#verdictReason {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Confidence Section */
.confidence-section {
    margin-bottom: var(--spacing-lg);
}

.confidence-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-secondary);
}

#confidenceValue {
    color: var(--text-primary);
    font-weight: 600;
}

.confidence-bar {
    height: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
}

.confidence-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-purple), var(--accent-cyan));
    border-radius: var(--radius-sm);
    transition: width 1s ease;
    position: relative;
    overflow: hidden;
}

.confidence-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Evidence Mass */
.evidence-mass {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
}

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

.mass-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.mass-value {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
}

.mass-value.support {
    color: var(--accent-green);
}

.mass-value.contradict {
    color: var(--accent-red);
}

/* Sources Section */
.sources-section {
    margin-bottom: var(--spacing-lg);
}

.sources-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

/* Source Card */
.source-card {
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.source-card:hover {
    transform: translateX(4px);
}

.source-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.source-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    flex: 1;
    line-height: 1.4;
}

.nli-badge {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.nli-badge.supports {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent-green);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.nli-badge.contradicts {
    background: rgba(239, 68, 68, 0.2);
    color: var(--accent-red);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.nli-badge.neutral {
    background: rgba(148, 163, 184, 0.2);
    color: var(--text-muted);
    border: 1px solid rgba(148, 163, 184, 0.3);
}

.source-snippet {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.source-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.source-link {
    color: var(--primary-purple-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.source-link:hover {
    color: var(--accent-cyan);
    text-decoration: underline;
}

.source-details {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
    display: none;
}

.source-card.expanded .source-details {
    display: block;
    animation: fadeIn var(--transition-normal);
}

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

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

.score-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.score-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.score-value {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 1rem;
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: var(--spacing-xl);
}

.loading-spinner {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    border: 4px solid rgba(139, 92, 246, 0.2);
    border-top-color: var(--primary-purple);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-state p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Error State */
.error-state {
    text-align: center;
    padding: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.error-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.error-state h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    color: var(--accent-red);
    margin-bottom: var(--spacing-sm);
}

.error-state p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .container {
        padding: var(--spacing-md);
    }
    
    .verdict-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .evidence-mass {
        grid-template-columns: 1fr;
    }
    
    .nli-scores {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
    }
    
    #verdictTitle {
        font-size: 1.5rem;
    }
}