.triangle-calculator {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    padding: 20px;
    color: #333;
    margin: 20px 0;
}

.triangle-calculator * {
    box-sizing: border-box;
}

.triangle-calculator .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    color: white;
}

.triangle-calculator .title {
    font-size: 28px;
    font-weight: 700;
    margin: 0;
}

.triangle-calculator .reset-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
}

.triangle-calculator .reset-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.triangle-calculator .main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
    margin-bottom: 20px;
}

.triangle-calculator .triangle-section,
.triangle-calculator .inputs-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(20px);
}

.triangle-calculator .section-title {
    font-size: 20px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 25px;
    text-align: center;
    margin-top: 0;
}

.triangle-calculator .triangle-display {
    position: relative;
    width: 100%;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 30px;
}

.triangle-calculator .triangle-svg {
    width: 100%;
    height: 100%;
    max-width: 280px;
}

.triangle-calculator .triangle-path {
    stroke: #2c3e50;
    stroke-width: 3;
    fill: rgba(52, 152, 219, 0.1);
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.1));
}

.triangle-calculator .right-angle-mark {
    stroke: #27ae60;
    stroke-width: 3;
    fill: rgba(39, 174, 96, 0.1);
}

.triangle-calculator .triangle-labels {
    font-size: 16px;
    font-weight: 600;
    fill: #2c3e50;
}

.triangle-calculator .input-groups {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.triangle-calculator .input-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.triangle-calculator .group-title {
    font-size: 16px;
    font-weight: 600;
    color: #34495e;
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 8px;
}

.triangle-calculator .input-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
}

.triangle-calculator .input-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.triangle-calculator .input-label {
    font-size: 14px;
    font-weight: 500;
    color: #7f8c8d;
    display: flex;
    align-items: center;
    gap: 5px;
}

.triangle-calculator .input-field {
    padding: 12px 15px;
    border: 2px solid #e1e8ed;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    background: white;
    transition: all 0.3s ease;
}

.triangle-calculator .input-field:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 15px rgba(52, 152, 219, 0.2);
    transform: translateY(-1px);
}

.triangle-calculator .input-field.calculated {
    background: #e8f8f5;
    border-color: #27ae60;
    color: #27ae60;
    font-weight: 600;
}

.triangle-calculator .results-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(20px);
}

.triangle-calculator .results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.triangle-calculator .result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: #f8f9fa;
    border-radius: 12px;
    border-left: 4px solid #3498db;
}

.triangle-calculator .result-label {
    font-weight: 600;
    color: #2c3e50;
}

.triangle-calculator .result-value {
    font-weight: 700;
    color: #27ae60;
    font-size: 18px;
}

.triangle-calculator .formula-section {
    background: #f1f2f6;
    border-radius: 12px;
    padding: 15px;
    border-left: 4px solid #9b59b6;
}

.triangle-calculator .formula-label {
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 8px;
}

.triangle-calculator .formula-display {
    font-family: 'Courier New', monospace;
    background: white;
    padding: 10px;
    border-radius: 8px;
    color: #8e44ad;
    font-weight: 500;
}

.triangle-calculator .error-message {
    background: #e74c3c;
    color: white;
    padding: 15px 20px;
    border-radius: 12px;
    margin-top: 20px;
    font-weight: 600;
    text-align: center;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.triangle-calculator .error-message.visible {
    opacity: 1;
    transform: translateY(0);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .triangle-calculator .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .triangle-calculator .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .triangle-calculator .title {
        font-size: 24px;
    }
    
    .triangle-calculator .triangle-section,
    .triangle-calculator .inputs-section {
        padding: 20px;
    }
    
    .triangle-calculator .results-grid {
        grid-template-columns: 1fr;
    }
}