/* 复用之前的基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background-color: #f8f9fa;
}

/* 导航栏样式 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.8rem;
    font-weight: bold;
    color: #2c3e50;
    text-decoration: none;
    background: linear-gradient(45deg, #3498db, #2980b9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-menu a {
    color: #34495e;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #3498db;
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-auth a {
    color: #fff;
    text-decoration: none;
    background: #3498db;
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(52, 152, 219, 0.2);
}

.nav-auth a:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(52, 152, 219, 0.3);
}

/* 底部版权样式 */
.footer {
    background-color: #fff;
    padding: 2.5rem 0;
    margin-top: 4rem;
    text-align: center;
    border-top: 1px solid #eee;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    color: #7f8c8d;
}

.footer-content p {
    margin: 0.8rem 0;
    font-size: 0.95rem;
}

.footer-content a {
    color: #7f8c8d;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-content a:hover {
    color: #3498db;
}

/* 导航栏响应式样式 */
@media (max-width: 768px) {
    .nav-container {
        padding: 0.8rem 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        width: 100%;
        overflow-x: auto;
        padding: 0.5rem 0;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .nav-menu::-webkit-scrollbar {
        display: none;
    }
    
    .nav-menu li {
        flex: 0 0 auto;
    }

    .nav-menu a {
        font-size: 0.95rem;
        white-space: nowrap;
        padding: 0.5rem 0.8rem;
    }

    .nav-auth {
        width: 100%;
        text-align: center;
    }

    .nav-auth a {
        display: block;
        margin: 0 1rem;
    }
}

/* 按钮样式 */
.primary-btn,
.secondary-btn {
    display: inline-block;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    margin-right: 1rem;
    transition: all 0.3s ease;
}

.primary-btn {
    background: linear-gradient(45deg, #3498db, #2980b9);
    color: white;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.secondary-btn {
    background: #95a5a6;
    color: white;
}

.secondary-btn:hover {
    background: #7f8c8d;
    transform: translateY(-2px);
}

/* 年终奖计算器特有样式 */
.container {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 2rem;
}

.usage-count {
    text-align: center;
    color: #7f8c8d;
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.calculator {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.formula-tip {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    color: #666;
    border-left: 4px solid #3498db;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #34495e;
    font-weight: 500;
}

.input-with-unit {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-unit input {
    width: 100%;
    padding: 0.8rem;
    padding-right: 3rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1.1rem;
    outline: none;
}

.input-with-unit input:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.unit {
    position: absolute;
    right: 1rem;
    color: #7f8c8d;
}

.result-preview {
    margin: 1.5rem 0;
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 0.8rem 0;
    border-bottom: 1px solid #eee;
}

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

.result-item.highlight {
    background: #e8f6ff;
    margin: 0.5rem -1.5rem -1.5rem;
    padding: 1rem 1.5rem;
    border-radius: 0 0 8px 8px;
}

.result-item.highlight span:last-child {
    color: #e74c3c;
    font-size: 1.2rem;
    font-weight: 600;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin: 1.5rem 0;
}

.notice-box {
    background: #fff8e1;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.notice-box h3 {
    color: #f39c12;
    margin-bottom: 1rem;
}

.notice-box ol {
    padding-left: 1.2rem;
    color: #666;
}

.notice-box li {
    margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .calculator {
        padding: 1.5rem;
    }

    .button-group {
        flex-direction: column;
    }

    .primary-btn,
    .secondary-btn {
        width: 100%;
        text-align: center;
    }

    .result-item.highlight {
        margin: 0.5rem -1rem -1rem;
        padding: 1rem;
    }
}