/* Modern Quiz App Styles */
:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary-color: #475569;
    --secondary-dark: #334155;
    --secondary-light: #64748b;
    --success-color: #22c55e;
    --success-dark: #16a34a;
    --danger-color: #ef4444;
    --danger-dark: #dc2626;
    --warning-color: #f59e0b;
    --warning-dark: #d97706;
    --accent-color: #06b6d4;
    --bg-color: #f1f5f9;
    --text-color: #0f172a;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --card-bg: #ffffff;
    --border-radius: 16px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #3b82f6 0%, #475569 50%, #06b6d4 100%);
    min-height: 100vh;
    padding: 2rem 1rem;
    color: var(--text-color);
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(71, 85, 105, 0.2) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Screen Management */
.screen {
    display: none;
    animation: fadeIn 0.5s ease-in;
    position: relative;
    z-index: 1;
}

.screen.active {
    display: block;
}

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

/* Logo */
.logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-logo {
    width: 150px;
    height: 150px;
    animation: logoFloat 3s ease-in-out infinite;
}

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

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, #3b82f6 0%, #475569 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 10px rgba(59, 130, 246, 0.1);
}

/* Category Buttons */
.category-btn {
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--card-bg);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.category-btn:hover {
    border-color: var(--primary-light);
    background: linear-gradient(135deg, #eff6ff 0%, #f1f5f9 100%);
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(59, 130, 246, 0.25);
}

.category-btn.selected {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(59, 130, 246, 0.4);
}

.category-btn-special {
    background: linear-gradient(135deg, var(--warning-color) 0%, var(--accent-color) 100%);
    color: white;
    border-color: var(--warning-color);
    font-size: 1.2rem;
    padding: 1.75rem;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.category-btn-special:hover {
    background: linear-gradient(135deg, var(--warning-dark) 0%, #0891b2 100%);
    border-color: var(--warning-dark);
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(245, 158, 11, 0.5);
}

.category-btn-special.selected {
    background: linear-gradient(135deg, var(--warning-dark) 0%, #0891b2 100%);
    border-color: var(--warning-dark);
    box-shadow: 0 16px 32px rgba(245, 158, 11, 0.6);
    transform: translateY(-4px);
}

.category-icon {
    font-size: 2rem;
}

/* Scoreboard */
.scoreboard {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.score-item {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    padding: 1.25rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
}

.score-item.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    transform: scale(1.08);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
    border-color: var(--primary-light);
}

.score-item h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.score-item .score-value {
    font-size: 2rem;
    font-weight: 700;
}

/* Quiz Card */
.quiz-card {
    border-radius: var(--border-radius);
    overflow: hidden;
    animation: slideIn 0.5s ease-out;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.quiz-card .card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%) !important;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Answer Buttons */
.answer-btn {
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--card-bg);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-color);
    text-align: left;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.answer-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left 0.5s ease;
}

.answer-btn:hover:not(:disabled) {
    border-color: var(--primary-light);
    background: linear-gradient(135deg, #eff6ff 0%, #f1f5f9 100%);
    transform: translateX(8px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.answer-btn:hover:not(:disabled)::before {
    left: 100%;
}

.answer-btn.correct {
    background: linear-gradient(135deg, var(--success-color) 0%, var(--success-dark) 100%);
    border-color: var(--success-color);
    color: white;
    animation: pulse 0.5s ease;
    box-shadow: 0 4px 16px rgba(34, 197, 94, 0.4);
}

.answer-btn.incorrect {
    background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-dark) 100%);
    border-color: var(--danger-color);
    color: white;
    animation: shake 0.5s ease;
    box-shadow: 0 4px 16px rgba(239, 68, 68, 0.4);
}

.answer-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

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

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-10px);
    }
    75% {
        transform: translateX(10px);
    }
}

/* Team Name Inputs */
.team-name-input {
    margin-bottom: 1rem;
}

.team-name-input label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: block;
}

/* Results */
.result-item {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.result-item.winner {
    background: linear-gradient(135deg, #fbbf24 0%, var(--warning-color) 100%);
    color: white;
    transform: scale(1.06);
    box-shadow: 0 12px 28px rgba(251, 191, 36, 0.5);
    border-color: #fbbf24;
    animation: winnerGlow 2s ease-in-out infinite;
}

@keyframes winnerGlow {
    0%, 100% {
        box-shadow: 0 12px 28px rgba(251, 191, 36, 0.5);
    }
    50% {
        box-shadow: 0 16px 36px rgba(251, 191, 36, 0.7);
    }
}

.result-item h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.result-item .final-score {
    font-size: 2.5rem;
    font-weight: 800;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border: none;
    border-radius: var(--border-radius);
    padding: 0.75rem 2rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-color) 100%);
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(59, 130, 246, 0.5);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-outline-danger {
    border: 2px solid var(--danger-color);
    color: var(--danger-color);
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--border-radius);
    padding: 0.75rem 2rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}

.btn-outline-danger:hover {
    background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-dark) 100%);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(239, 68, 68, 0.5);
    border-color: var(--danger-dark);
}

/* Cards */
.card {
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-lg);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
}

/* Footer */
footer {
    color: rgba(255, 255, 255, 0.8);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 1rem 0.5rem;
    }
    
    .app-logo {
        width: 100px;
        height: 100px;
    }
    
    .category-btn {
        padding: 1rem;
        font-size: 1rem;
    }
    
    .category-icon {
        font-size: 1.5rem;
    }
    
    .answer-btn {
        padding: 1rem;
        font-size: 1rem;
    }
    
    .score-item .score-value {
        font-size: 1.5rem;
    }
}