/* =================== 제출 및 채점 버튼 =================== */
.slide-actions {
    margin-top: 2rem;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-grade {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.btn-grade:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

.btn-grade:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-show-answer {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    margin-left: 1rem;
}

/* =================== 해설 박스 =================== */
.explanation-box {
    margin-top: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-left: 4px solid #3b82f6;
    border-radius: 8px;
    display: none;
}

.explanation-box.show {
    display: block;
    animation: slideDown 0.5s ease;
}

.explanation-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.explanation-icon {
    font-size: 1.5rem;
    color: #3b82f6;
    margin-right: 0.75rem;
}

/* =================== 점수 표시 =================== */
.score-display {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    display: none;
}

.score-display.show {
    display: block;
    animation: zoomIn 0.5s ease;
}

.score-value {
    font-size: 3rem;
    font-weight: bold;
    text-align: center;
    margin-bottom: 1rem;
}

.score-perfect { color: #10b981; }
.score-good { color: #3b82f6; }
.score-fair { color: #f59e0b; }
.score-poor { color: #ef4444; }

/* =================== 네비게이션 버튼 =================== */
.slide-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.nav-btn {
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.nav-btn-prev {
    background: #6c757d;
    color: white;
}

.nav-btn-next {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.nav-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

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

/* =================== 진행률 표시 =================== */
.progress-container {
    margin-bottom: 2rem;
    background: white;
    padding: 1rem;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    height: 8px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 4px;
    transition: width 0.5s ease;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: #6c757d;
}