/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background-color: #fff;
    color: #333;
    line-height: 1.6;
}

header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 20px;
    margin-bottom: 1rem;
    margin-top: 1.5rem;
    border-bottom: 1px solid #eee;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.logo {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s ease;
}

.logo-link:hover {
    opacity: 0.8;
}

.logo-icon {
    background-color: #000;
    color: #fff;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    margin-right: 10px;
}

header h1 {
    font-size: 2rem;
    color: #000;
}

.back-link-container {
    margin-bottom: 1rem;
    padding: 0 20px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
}

.back-link {
    color: #007bff;
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: #0056b3;
    text-decoration: underline;
}

header p {
    font-size: 1rem;
    color: #666;
}

main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 计算器容器 */
.calculator-container {
    width: 100%;
    margin-bottom: 2rem;
}

/* 计算器部分 */
.calculator-section {
    background-color: #f5f5f5;
    border-radius: 5px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.calculator-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 1rem;
    position: relative;
}

.label {
    font-size: 1rem;
    color: #333;
}

input[type="number"] {
    width: 100px;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 3px;
    font-size: 1rem;
    text-align: center;
}

input[type="number"]:focus {
    border-color: #4a90e2;
    outline: none;
}

.result-box {
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 3px;
    padding: 0.5rem 1rem;
    min-width: 100px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.result-box:not(:empty) {
    border-color: #2c5aa0;
    animation: pulse 0.5s ease-in-out;
}

.result-box.error {
    border-color: #e74c3c;
    animation: shake 0.5s ease-in-out;
}

.result-box.error span {
    color: #e74c3c;
}

.result-box.error::before {
    background-color: #e74c3c;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

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

.result-box span {
    font-weight: bold;
    font-size: 1.1rem;
    color: #2c5aa0;
    display: inline-block;
    transition: all 0.3s ease;
}

.result-box:not(:empty)::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: #2c5aa0;
}

/* 按钮样式 */
.action-result-group {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-left: auto;
}

.calculate-btn {
    background-color: #2c5aa0;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.calculate-btn:hover {
    background-color: #1e4785;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.calculate-btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* 提示部分 */
.tips-container {
    border: 1px solid #ddd;
    padding: 1rem;
    margin: 2rem 0;
    border-radius: 3px;
}

.tips {
    color: #666;
    font-size: 0.9rem;
    text-align: center;
}

/* 信息容器 */
.info-container {
    margin: 3rem 0;
}

/* 关于部分 */
.about-section {
    margin-bottom: 2rem;
}

.about-section h2 {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 1rem;
}

.about-section p {
    color: #555;
    line-height: 1.6;
    margin-bottom: 1rem;
}

/* FAQ部分 */
.faq-section {
    margin-bottom: 2rem;
}

.faq-section h2 {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 1.5rem;
}

.faq-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #eee;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h3 {
    font-size: 1.3rem;
    color: #2c5aa0;
    margin-bottom: 0.8rem;
}

.faq-item p {
        color: #555;
        line-height: 1.6;
    }
    
/* 隐私政策页面样式 */
.privacy-container {
    max-width: 1000px;
    margin: 0 auto 2rem;
    padding: 1.5rem;
    background-color: #f9f9f9;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.privacy-container h2 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 0.5rem;
    border-bottom: 2px solid #2c5aa0;
    padding-bottom: 0.5rem;
}

.last-updated {
    color: #777;
    font-style: italic;
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.privacy-section {
    margin-bottom: 2rem;
}

.privacy-section h3 {
    font-size: 1.4rem;
    color: #2c5aa0;
    margin-bottom: 1rem;
}

.privacy-section p {
    margin-bottom: 1rem;
    line-height: 1.6;
    color: #444;
}

.privacy-section ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.privacy-section li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
    color: #444;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 1rem;
    color: #666;
    margin-top: 2rem;
    border-top: 1px solid #eee;
    font-size: 0.9rem;
}

footer a {
    color: #2c5aa0;
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: #1a3c6e;
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .calculator-row {
        flex-wrap: wrap;
        margin-bottom: 1.5rem;
        width: 100%;
    }

    .calculator-section {
        padding: 1.2rem;
    }

    .label {
        margin: 0 0.3rem;
        display: inline-block;
    }

    input[type="number"] {
        width: auto;
        margin: 0 0.3rem;
        padding: 0.7rem;
        font-size: 1.1rem;
    }
    
    .action-result-group {
        width: 100%;
        flex-direction: row;
        justify-content: space-between;
        gap: 10px;
        margin-top: 1rem;
        flex-basis: 100%;
    }

    .calculate-btn {
        width: 48%;
        margin: 10px 0;
        padding: 0.8rem;
        font-size: 1rem;
    }

    .result-box {
        width: 48%;
        text-align: center;
        padding: 0.8rem;
        margin-top: 0;
    }

    .logo {
        flex-direction: column;
        align-items: flex-start;
    }

    .logo-icon {
        margin-bottom: 10px;
    }
    
    /* 响应式信息部分 */
    .info-container {
        padding: 0 1rem;
    }
    
    .about-section h2,
    .faq-section h2,
    .privacy-container h2 {
        font-size: 1.5rem;
    }
    
    .privacy-section h3 {
        font-size: 1.2rem;
    }
    
    .privacy-container {
        padding: 1rem;
        margin-bottom: 1rem;
    }
    
    .privacy-section {
        margin-bottom: 1.5rem;
    }
    
    .privacy-section ul {
        margin-left: 1rem;
    }
    
    .faq-item h3 {
        font-size: 1.2rem;
    }
    
    /* 移动设备上的额外优化 */
    header {
        padding: 1rem 15px;
    }
    
    main {
        padding: 0 15px;
    }
    
    .tips-container {
        padding: 0.8rem;
        margin: 1.5rem 0;
    }
    
    .back-link-container {
        padding: 0 15px;
    }
}

/* 超小屏幕设备优化 */
@media (max-width: 480px) {
    header h1 {
        font-size: 1.6rem;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 1.6rem;
    }
    
    .calculator-section {
        padding: 1rem;
    }
    
    .label {
        font-size: 0.9rem;
        margin: 0 0.2rem;
    }
    
    input[type="number"] {
        padding: 0.6rem;
        font-size: 1rem;
        max-width: 70px;
    }
    
    .action-result-group {
        flex-direction: column;
    }
    
    .calculate-btn {
        padding: 0.7rem;
        font-size: 0.9rem;
        width: 100%;
    }
    
    .result-box {
        padding: 0.7rem;
        width: 100%;
        margin-top: 0.5rem;
    }
    
    .result-box span {
        font-size: 1rem;
    }
    
    .about-section h2,
    .faq-section h2 {
        font-size: 1.3rem;
    }
    
    .faq-item h3 {
        font-size: 1.1rem;
    }
}