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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 10px;
}

#game-container {
    width: 100%;
    max-width: 550px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    overflow: hidden;
}

#game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: white;
}

.game-title {
    font-size: 1.3rem;
    font-weight: 700;
}

.stats {
    display: flex;
    gap: 20px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-label {
    font-size: 0.7rem;
    opacity: 0.9;
    text-transform: uppercase;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

#game-area {
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.instruction {
    text-align: center;
    font-size: 1.1rem;
    color: #4B5563;
    font-weight: 500;
}

.target-number {
    font-size: 3rem;
    font-weight: 700;
    color: white;
    background: linear-gradient(135deg, #EF4444, #DC2626);
    padding: 16px 40px;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(239, 68, 68, 0.4);
}

.number-line {
    width: 100%;
    position: relative;
    padding: 40px 20px;
}

.line-markers {
    position: relative;
    height: 60px;
    background: linear-gradient(to right, #E5E7EB, #E5E7EB);
    background-size: 100% 4px;
    background-repeat: no-repeat;
    background-position: center;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.marker {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.marker::before {
    content: '';
    width: 3px;
    height: 20px;
    background: #374151;
    margin-bottom: 8px;
}

.marker-label {
    font-size: 1rem;
    font-weight: 600;
    color: #374151;
}

.clickable-area {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    height: 60px;
    cursor: crosshair;
    z-index: 10;
}

.ninja {
    position: absolute;
    font-size: 2rem;
    top: 0;
    transform: translateX(-50%);
    z-index: 20;
    transition: left 0.3s ease-out;
}

.correct-marker {
    position: absolute;
    top: 20px;
    width: 4px;
    height: 30px;
    background: #10B981;
    transform: translateX(-50%);
    z-index: 5;
}

.correct-marker::after {
    content: '✓';
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    color: #10B981;
    font-size: 1.2rem;
    font-weight: 700;
}

.feedback {
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
}

.feedback.correct {
    background: #D1FAE5;
    color: #065F46;
}

.feedback.wrong {
    background: #FEE2E2;
    color: #991B1B;
}

.hidden {
    display: none !important;
}

.btn-primary {
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #10B981, #059669);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 40px;
    border-radius: 24px;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.stars {
    font-size: 3rem;
    margin-bottom: 16px;
}

.modal-content h2 {
    font-size: 1.8rem;
    color: #1F2937;
    margin-bottom: 20px;
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 24px;
}

.result-stat {
    display: flex;
    flex-direction: column;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: #EF4444;
}

.result-label {
    font-size: 0.9rem;
    color: #6B7280;
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.btn-secondary {
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    color: #374151;
    background: #F3F4F6;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background: #E5E7EB;
}