* {
    box-sizing: border-box;
}

.wp-fraction-calculator {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 1200px;
    margin: 20px auto;
    background-color: #fff;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    animation: fadeIn 0.5s ease-in;
}

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

.wp-fraction-calculator .header {
    text-align: center;
    padding: 10px;
    background: linear-gradient(135deg, #f0f9ff 0%, #dbeafe 100%);
    border-bottom: 1px solid #60a5fa;
}

.wp-fraction-calculator .header .title {
    color: #1d4ed8;
    margin: 0;
    font-size: 20px;
    font-weight: 600;
}

.wp-fraction-calculator .main-content {
    display: flex;
    min-height: 600px;
}

.wp-fraction-calculator .left-panel {
    flex: 1;
    padding: 30px;
    border-right: 1px solid #e2e8f0;
    background-color: #fff;
}

.wp-fraction-calculator .right-panel {
    flex: 1;
    padding: 30px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    overflow-y: auto;
    max-height: 600px;
}

.wp-fraction-calculator .fraction-inputs {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px 0 30px 0;
    flex-wrap: wrap;
    gap: 20px;
}

.wp-fraction-calculator .fraction-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.wp-fraction-calculator .fraction-part {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.wp-fraction-calculator .calc-input {
    text-align: center;
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 20px;
    font-weight: 500;
    transition: all 0.3s ease;
    background-color: #f8fafc;
    width: 80px;
    height: 50px;
}

.wp-fraction-calculator .calc-input:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    background-color: #fff;
}

.wp-fraction-calculator .calc-input.active {
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
    background-color: #fff;
}

.wp-fraction-calculator .fraction-divider {
    width: 70px;
    height: 3px;
    background: linear-gradient(90deg, #2563eb, #1d4ed8);
    margin: 5px 0;
    border-radius: 2px;
}

.wp-fraction-calculator .operator-display {
    padding: 12px 16px;
    font-size: 32px;
    font-weight: bold;
    color: #1d4ed8;
    background-color: #dbeafe;
    border-radius: 15px;
    min-width: 60px;
    text-align: center;
    border: 2px solid #93c5fd;
}

.wp-fraction-calculator .navigation-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 25px;
}

.wp-fraction-calculator .nav-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #4f46e5 0%, #3730a3 100%);
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.wp-fraction-calculator .nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.wp-fraction-calculator .keypad {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.wp-fraction-calculator .keypad-btn {
    padding: 15px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    height: 55px;
    transition: all 0.2s ease;
    box-shadow: 0 3px 10px rgba(37, 99, 235, 0.2);
}

.wp-fraction-calculator .keypad-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
}

.wp-fraction-calculator .keypad-btn:active {
    transform: translateY(0);
}

.wp-fraction-calculator .keypad-btn.action {
    background: linear-gradient(135deg, #7c3aed 0%, #5b21b6 100%);
    font-size: 14px;
}

.wp-fraction-calculator .keypad-btn.action:hover {
    box-shadow: 0 5px 15px rgba(124, 58, 237, 0.3);
}

.wp-fraction-calculator .calc-btn {
    width: 100%;
    padding: 18px;
    border: none;
    border-radius: 15px;
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: white;
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 15px;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(5, 150, 105, 0.2);
}

.wp-fraction-calculator .calc-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(5, 150, 105, 0.3);
}

.wp-fraction-calculator .right-panel .section-title {
    color: #1e40af;
    font-size: 22px;
    margin-bottom: 25px;
    padding-bottom: 12px;
    border-bottom: 3px solid #93c5fd;
    text-align: center;
}

.wp-fraction-calculator .empty-state {
    text-align: center;
    color: #6b7280;
    font-style: italic;
    padding: 60px 20px;
}

.wp-fraction-calculator .empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
    display: block;
}

.wp-fraction-calculator .empty-message {
    font-size: 18px;
    line-height: 1.6;
}

.wp-fraction-calculator .section-header {
    color: #1e40af;
    font-size: 18px;
    font-weight: 600;
    margin: 25px 0 15px 0;
    padding: 12px 15px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 8px;
    border-left: 5px solid #2563eb;
}

.wp-fraction-calculator .result-section {
    background-color: #fff;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    border-left: 5px solid #2563eb;
}

.wp-fraction-calculator .final-answer-section {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: white;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 25px;
    text-align: center;
    box-shadow: 0 6px 20px rgba(5, 150, 105, 0.2);
}

.wp-fraction-calculator .step-detail {
    background-color: #f8fafc;
    padding: 20px;
    border-radius: 10px;
    margin: 15px 0;
    border-left: 5px solid #64748b;
}

.wp-fraction-calculator .calculation-step {
    font-size: 18px;
    margin: 12px 0;
    padding: 15px;
    background-color: #fff;
    border-radius: 8px;
    border: 2px solid #e2e8f0;
    text-align: center;
}

.wp-fraction-calculator .advanced-method {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    padding: 20px;
    border-radius: 12px;
    margin: 20px 0;
    border-left: 5px solid #2563eb;
}

.wp-fraction-calculator .advanced-explanation {
    margin-top: 15px;
}

.wp-fraction-calculator .divisors-display {
    background: #f8fafc;
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
    border: 1px solid #e2e8f0;
}

.wp-fraction-calculator .divisors-row {
    margin-bottom: 12px;
    font-size: 16px;
}

.wp-fraction-calculator .divisors-summary {
    margin-top: 15px;
    padding: 10px;
    background: #fff;
    border-radius: 6px;
    border-left: 4px solid #2563eb;
}

.wp-fraction-calculator .crossed-out {
    position: relative;
    display: inline-block;
    color: #999;
    font-size: 22px;
    font-weight: bold;
}

.wp-fraction-calculator .crossed-out::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 45%, #2563eb 47%, #2563eb 53%, transparent 55%);
    pointer-events: none;
}

.wp-fraction-calculator .division-annotation {
    font-size: 12px;
    color: #2563eb;
    font-weight: bold;
    margin: 0 2px;
    vertical-align: super;
}

.wp-fraction-calculator .learning-points {
    background-color: #fff;
    padding: 20px;
    border-radius: 12px;
    margin-top: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    border-left: 5px solid #2563eb;
}

.wp-fraction-calculator .learning-content {
    font-size: 16px;
    line-height: 1.7;
    color: #4a5568;
}

/* 割り算特有のスタイル */
.wp-fraction-calculator .inverse-fraction {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 2px solid #2563eb;
    border-radius: 8px;
    padding: 10px;
    margin: 5px;
    display: inline-block;
}

.wp-fraction-calculator .conversion-arrow {
    font-size: 24px;
    color: #2563eb;
    margin: 0 15px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.wp-fraction-calculator .step-explanation {
    background: linear-gradient(135deg, #fefcf3 0%, #fde68a 100%);
    border: 1px solid #f59e0b;
    border-radius: 8px;
    padding: 15px;
    margin: 10px 0;
    font-size: 16px;
    color: #92400e;
}

.wp-fraction-calculator .reciprocal-highlight {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 2px dashed #2563eb;
    border-radius: 8px;
    padding: 15px;
    margin: 10px 0;
    text-align: center;
}

.wp-fraction-calculator .mixed-number-display {
    background: linear-gradient(135deg, #f0fdf4 0%, #bbf7d0 100%);
    border: 2px solid #16a34a;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
    text-align: center;
}

@media (max-width: 768px) {
    .wp-fraction-calculator .main-content {
        flex-direction: column;
    }
    
    .wp-fraction-calculator .left-panel {
        border-right: none;
        border-bottom: 1px solid #e2e8f0;
    }
    
    .wp-fraction-calculator .right-panel {
        min-height: 300px;
        max-height: 500px;
    }
    
    .wp-fraction-calculator {
        margin: 10px;
        border-radius: 15px;
    }
    
    .wp-fraction-calculator .header {
        padding: 20px;
    }
    
    .wp-fraction-calculator .left-panel, .wp-fraction-calculator .right-panel {
        padding: 20px;
    }
    
    .wp-fraction-calculator .fraction-inputs {
        flex-direction: column;
        gap: 25px;
    }
    
    .wp-fraction-calculator .calc-input {
        font-size: 18px;
        width: 70px;
        height: 45px;
    }
}