/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
    background-color: #f5f6fa;
    line-height: 1.6;
    color: #2c3e50;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

/* 标题样式 */
header h1 {
    text-align: center;
    color: #2c3e50;
    font-size: 2.5rem;
    margin: 2rem 0;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

/* 日期显示 */
#currentDate {
    text-align: center;
    font-size: 1.1rem;
    color: #7f8c8d;
    margin-bottom: 2rem;
}

/* 结果区域 */
#todayResult,
#result {
    background-color: #ffffff;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin: 1.5rem 0;
    font-size: 1.2rem;
    text-align: center;
}

/* 输入框样式 */
input[type="number"] {
    width: 100%;
    padding: 12px 20px;
    margin: 15px 0;
    border: 2px solid #dfe6e9;
    border-radius: 8px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

input[type="number"]:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 8px rgba(52,152,219,0.3);
}

/* 特殊文本样式 */
.no-clean {
    color: #e74c3c;
    font-weight: 500;
}

.error {
    color: #e74c3c;
    font-weight: 500;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    body {
        padding: 15px;
    }

    header h1 {
        font-size: 2rem;
        margin: 1.5rem 0;
    }

    #todayResult,
    #result {
        font-size: 1rem;
        padding: 1rem;
    }

    input[type="number"] {
        font-size: 1rem;
        padding: 10px 15px;
    }
}

@media screen and (min-width: 1024px) {
    body {
        padding: 30px;
    }

    #todayResult,
    #result {
        font-size: 1.3rem;
    }
}

/* 交互动画 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

#todayResult,
#result,
#currentDate {
    animation: fadeIn 0.5s ease-out;
}

/* 分割线样式 */
hr {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0,0,0,0), rgba(0,0,0,0.1), rgba(0,0,0,0));
    margin: 2rem 0;
}