/* Modern Dark Mode MLB Trivia - Mobile First Design */

:root {
    /* Dark Mode Color Palette */
    --bg-primary: #0a0a0f;
    --bg-secondary: #151520;
    --bg-tertiary: #1e1e2e;
    --bg-card: #242438;
    --bg-elevated: #2a2a42;
    
    /* Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --gradient-secondary: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    --gradient-accent: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-accent: #a855f7;
    
    /* Interactive Colors */
    --border-subtle: #334155;
    --border-active: #6366f1;
    --shadow-glow: rgba(99, 102, 241, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-elevated: 0 16px 64px rgba(0, 0, 0, 0.6);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.025em;
    margin: 0 0 var(--space-md) 0;
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }

p {
    margin: 0 0 var(--space-md) 0;
    color: var(--text-secondary);
}

.text-muted { color: var(--text-muted); }
.text-accent { color: var(--text-accent); }

/* Layout Components */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-2xl) 0;
}

/* Neumorphic Cards */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-elevated);
    border-color: var(--border-active);
}

.card-elevated {
    background: var(--bg-elevated);
    box-shadow: var(--shadow-elevated);
}

.card-body {
    padding: var(--space-xl);
}

/* Navigation */
.navbar {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: var(--font-size-xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.navbar-brand i {
    animation: rotate 3s linear infinite;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn::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 0.5s;
}

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

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--border-active);
    transform: translateY(-2px);
}

.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: var(--font-size-lg);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Hero Section */
.hero-section {
    padding: var(--space-2xl) 0;
    text-align: center;
    position: relative;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.05em;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-2xl) auto;
    line-height: 1.5;
}

.baseball-icon {
    font-size: 4rem;
    color: var(--text-accent);
    margin-bottom: var(--space-xl);
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

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

/* Stat Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin: var(--space-2xl) 0;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: center;
    border: 1px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

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

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-active);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.stat-card i {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card h4 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-bottom: var(--space-sm);
}

/* Question Interface */
.question-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-elevated);
    overflow: hidden;
    margin-bottom: var(--space-xl);
}

.question-header {
    background: var(--gradient-primary);
    padding: var(--space-lg) var(--space-xl);
    color: white;
    text-align: center;
}

.question-number {
    font-size: var(--font-size-sm);
    opacity: 0.8;
    font-weight: 500;
}

.question-text {
    font-size: var(--font-size-lg);
    line-height: 1.6;
    padding: var(--space-xl);
    background: var(--bg-card);
    margin: 0;
}

/* Options */
.options-grid {
    display: grid;
    gap: var(--space-md);
    padding: var(--space-xl);
}

.option-card {
    position: relative;
}

.option-input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.option-label {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.option-label::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.5s;
}

.option-label:hover::before {
    left: 100%;
}

.option-label:hover {
    border-color: var(--border-active);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.2);
}

.option-input:checked + .option-label {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(139, 92, 246, 0.2));
    border-color: var(--border-active);
    box-shadow: 0 8px 30px var(--shadow-glow);
}

.option-letter {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-secondary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.option-input:checked + .option-label .option-letter {
    background: var(--gradient-primary);
    animation: pulse-glow 1s ease-in-out;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.7); }
    50% { box-shadow: 0 0 0 10px rgba(99, 102, 241, 0); }
}

.option-text {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-primary);
}

/* Progress Bar */
.progress-container {
    margin-bottom: var(--space-xl);
}

.progress {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    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%); }
}

/* Results */
.results-section {
    text-align: center;
    padding: var(--space-2xl) 0;
}

.score-circle {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-xl) auto;
    color: white;
    position: relative;
    animation: score-appear 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.score-circle::before {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border-radius: 50%;
    background: conic-gradient(from 0deg, #6366f1, #8b5cf6, #a855f7, #6366f1);
    z-index: -1;
    animation: rotate 3s linear infinite;
}

@keyframes score-appear {
    from {
        transform: scale(0) rotate(180deg);
        opacity: 0;
    }
    to {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
}

.score-text {
    font-size: var(--font-size-3xl);
    font-weight: 900;
    line-height: 1;
}

.percentage-text {
    font-size: var(--font-size-base);
    opacity: 0.9;
    font-weight: 500;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin: var(--space-2xl) 0;
}

.feature-card {
    text-align: center;
    padding: var(--space-xl);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--space-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

/* Ripple Effect */
.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(99, 102, 241, 0.3);
    transform: scale(0);
    animation: ripple-animation 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Loading States */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid rgba(99, 102, 241, 0.3);
    border-top: 3px solid #6366f1;
    border-radius: 50%;
    animation: loading-spin 1s linear infinite;
}

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

/* Responsive Design - Mobile First */
@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-xl);
    }
    
    .options-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .hero-section {
        padding: var(--space-2xl) 0 4rem 0;
    }
    
    .card-body {
        padding: var(--space-2xl);
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    :root {
        --font-size-base: 1.125rem;
        --font-size-lg: 1.25rem;
        --font-size-xl: 1.375rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Accessibility */
.btn:focus-visible,
.option-label:focus-visible {
    outline: 2px solid var(--border-active);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-subtle: #64748b;
        --text-muted: #cbd5e1;
    }
}

/* Notification System */
.notification {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    background: var(--bg-elevated);
    border: 1px solid var(--border-active);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-elevated);
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.notification.success {
    border-color: #10b981;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(6, 182, 212, 0.1));
}

.notification.error {
    border-color: #ef4444;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(245, 158, 11, 0.1));
}

/* Footer */
.footer-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-2xl) 0 var(--space-xl) 0;
    margin-top: auto;
}

.footer-content {
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.footer-brand i {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-text {
    color: var(--text-muted);
    margin: 0;
}

/* Feedback Option Styles */
.feedback-option {
    cursor: default !important;
    pointer-events: none;
}

.feedback-option.correct-answer {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(6, 182, 212, 0.1));
    border-color: #10b981;
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.3);
}

.feedback-option.selected-wrong {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(245, 158, 11, 0.1));
    border-color: #ef4444;
    box-shadow: 0 4px 20px rgba(239, 68, 68, 0.3);
}

.feedback-option.selected-correct {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.3), rgba(6, 182, 212, 0.2));
    border-color: #10b981;
    box-shadow: 0 8px 30px rgba(16, 185, 129, 0.4);
}

.feedback-option.correct-answer .option-letter {
    background: #10b981;
}

.feedback-option.selected-wrong .option-letter {
    background: #ef4444;
}

.feedback-option .option-status {
    font-size: var(--font-size-lg);
    margin-left: auto;
}

/* Feedback Card Animation */
.feedback-card {
    animation: slideInUp 0.5s ease;
}

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

.feedback-icon {
    animation: bounceIn 0.6s ease;
}

@keyframes bounceIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
        opacity: 1;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}